(19)
(11)EP 2 616 207 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
17.06.2020 Bulletin 2020/25

(21)Application number: 11760657.4

(22)Date of filing:  13.09.2011
(51)International Patent Classification (IPC): 
C25F 3/02(2006.01)
C25F 7/00(2006.01)
B23H 9/00(2006.01)
C25F 3/14(2006.01)
B23H 5/04(2006.01)
B23H 9/10(2006.01)
(86)International application number:
PCT/US2011/051392
(87)International publication number:
WO 2012/037121 (22.03.2012 Gazette  2012/12)

(54)

MACHINING SYSTEMS AND METHODS

BEARBEITUNGSSYSTEME UND VERFAHREN

SYSTÈMES ET PROCÉDÉS D'USINAGE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 14.09.2010 CN 201010282608

(43)Date of publication of application:
24.07.2013 Bulletin 2013/30

(73)Proprietor: General Electric Company
Schenectady, NY 12345 (US)

(72)Inventors:
  • ZHAN, Yimin
    Niskayuna, NY 12309 (US)
  • PENG, Zhixue
    Niskayuna, NY 12309 (US)
  • GUO, Yuanyuan
    Niskayuna, NY 12309 (US)
  • YUAN, Renewi
    Niskayuna, NY 12309 (US)
  • ARCIONI, Massimo
    Niskayuna, NY 12309 (US)
  • LI, Hongtao
    Shanghai 201203 (CN)
  • NELSON, Garth, M.
    Niskayuna, NY 12309 (US)
  • LUO, Yuanfeng
    Niskayuna, NY 12309 (US)
  • CHIARI, Francescosaverio
    I-50142 Firenze (IT)

(74)Representative: Dennemeyer & Associates S.A. 
Landaubogen 1-3
81373 München
81373 München (DE)


(56)References cited: : 
EP-A2- 0 267 718
JP-A- 54 024 379
US-A- 4 996 762
EP-A2- 1 932 611
US-A- 4 703 142
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    BACKGROUND



    [0001] This invention relates generally to machining systems and methods. More particularly, this invention relates to machining systems and methods employing electromachining such as electroerosion machining. US4703142 discloses such a system and method.

    [0002] Electromachining, such as electro discharge machining (EDM) and electrochemical machining (ECM) are conventional electromachining processes for machining objects such as gas turbine components. In ECM, an electrolyte is circulated between an electrode and a workpiece for permitting electrochemical dissolution of workpiece materials, as well as cooling and flushing a gap therebetween. EDM processes circulate a nonconductive (dielectric) liquid in a gap between an electrode and a workpiece to permit electrical discharges in the gap to remove workpiece materials.

    [0003] As used herein, the term "electroerosion" should be understood to apply to those electromachining processes that circulate an electrolyte in the gap between the electrode(s) and the workpiece, these processes enabling a high rate of material removal and reducing thermal damages to the workpiece.

    [0004] Machining systems, such as computer numerical controlled (CNC) machines (or "machining centers") are widely used for machining workpieces. However, during conventional machining processes, such as conventional full milling processes, when such machining systems machine workpieces, for example, workpieces having complex geometries and/or higher hardness, it is difficult and time-consuming, and the cutting tool cost is higher. On the contrary, the electroerosion machining has advantages of noncontact machining, higher efficiency and lower cutting tool cost.

    [0005] Therefore, there is a need for a new and improved machining systems and methods employing electromachining such as electroerosion machining.

    BRIEF DESCRIPTION



    [0006] A machining system for machining a workpiece is provided in accordance with claim 1. Preferred embodiments of the system are claimed in claims 2 and 3. The machining system comprises a machine tool, a plurality of cutting tools configured to machine a workpiece, and a CNC controller configured to control the machine tool to move the respective cutting tools relative to the workpiece. The plurality of tools comprises an electrode and a conventional cutting tool exchangeably disposed on the machine tool. The machining system further comprises a power supply configured to energize the electrode and the workpiece to opposite electrical polarities, a process controller configured to monitor gap status between the electrode and the workpiece, and communicate with the CNC controller to control the machine tool, and an electrolyte supply configured to pass an electrolyte between the workpiece and the respective cutting tools. Wherein the machine tool, the electrode, the CNC controller, the power supply, the process controller and the electrolyte supply are configured to cooperate to function as an electroerosion machining device, and the machine tool, the CNC controller, the conventional cutting tool and the electrolyte supply are configured to cooperate to function as a conventional machining device, and wherein the machining system is configured to function alternately as the electroerosion machining device and the conventional machining device.

    [0007] A method for making a machined workpiece comprising one or more conduits is provided in accordance with claim 4. Preferred embodiments of the method are claimed in claims 5-15. The method comprises (a) identifying the position and dimensions of each of the one or more conduits to be formed in a workpiece, each of the one or more conduits to be formed comprising at least two target zones; (b) performing a first electroerosion machining step to define a first cavity within a first target zone of each of the one or more conduits to be formed; (c) performing a second electroerosion machining step to define a second cavity within a second target zone of each of the one or more conduits to be formed; (d) performing a first conventional machining step on the first cavity within the first target zone of each of the one or more conduits to be formed; and (e) performing a second conventional machining step on the second cavity within the second target zone of each of the one or more conduits to be formed.

    [0008] An embodiment of the invention further provides a method for making a machined workpiece comprising one or more conduits. The method comprises: (a) identifying the position and dimensions of each of the one or more conduits to be formed in a workpiece, each of the one or more conduits to be formed comprising at least two target zones; (b) performing a first electroerosion machining step to define a first cavity within a first target zone of each of the one or more conduits to be formed; and (c) performing a second electroerosion machining step to define a second cavity within a second target zone of each of the one or more conduits to be formed. Wherein the first cavity and the second cavity are defined within the at least two respective target zones along opposite directions.

    BRIEF DESCRIPTION OF THE DRAWINGS



    [0009] The above and other aspects, features, and advantages of the present disclosure will become more apparent in light of the following detailed description when taken in conjunction with the accompanying drawings in which:

    FIG. 1 is a schematic diagram of a machining system employing electroerosion machining in accordance with one embodiment of the invention;

    FIG. 2 is a schematic perspective diagram of a workpiece;

    FIG. 3 is a schematic perspective diagram of a solid model of a conduit of the workpiece shown in FIG. 2; and

    FIG. 4 is a schematic plane view illustrating machining of the conduit of the workpiece shown in FIGS. 2-3.


    DETAILED DESCRIPTION OF THE DISCLOSURE



    [0010] Embodiments of the present disclosure will be described hereinbelow with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the disclosure in unnecessary detail.

    [0011] FIG. 1 illustrates a schematic diagram of a machining system 10 for machining a workpiece 101 in accordance with one embodiment of the invention. It should be noted that the arrangement in FIG. 1 is merely illustrative. In embodiments of the invention, the machining system 10 may comprise a computer numerical controlled (CNC) machine (or "machining center") and may automatically machine the workpiece 101 according to preset control programs therein with one or more cutting tools, which may or may not be carried in a tool storage or magazine of the machining system 10.

    [0012] In some examples, the one or more cutting tools of the machining system 10 may perform one or more respective machining processes. Non-limiting examples of the one or more machining processes may include one or more of conventional machining processes such as milling processes and electromachining processes such as electroerosion machining processes. As used herein, the term "conventional machining" may be different from the term "electroerosion machining" and indicate conventional mechanical machining using conventional cutting tools such as milling tools.

    [0013] In one non-limiting example, the machining system 10 functions as both an electroerosion machining device and a conventional machining device to perform both the electroerosion machining process and the milling process. As illustrated in FIG. 1, for electroerosion machining, the machining system 10 comprises a numerical control (NC) or computer numerical control (CNC) device (not shown) including a machine tool (working apparatus) 11, a CNC controller 12, a process controller 13, a power supply 14, an electrolyte supply 15, and an electrode 16.

    [0014] In some embodiments, the NC or the CNC device may be used to perform conventional automated machining. In certain applications, the machine tool 11 may include servomotors (not shown) and spindle motors (not shown), which are known to one skilled in the art. The electrode 16 is mounted on a spindle (not shown) of the machine tool 11 for performing electroerosion machining. The servomotors may drive the electrode 16 and the workpiece 101 to move relative to each other at a desired speed and path, and the spindle motors drive the electrode 16 to rotate at a desired speed.

    [0015] The CNC controller 12 comprises pre-programmed instructions based on descriptions of the workpiece 101 in a computer-aided design (CAD) and/or a computer-aided manufacturing (CAM), and is connected to the machine tool 11 to control the machine tool 11 to drive the electrode 16 to move according to certain operational parameters, such as certain feedrates, axes positions, or spindle speeds etc. In some examples, the CNC controller 12 may be a general CNC controller and comprise central processing units (CPU), read only memories (ROM), and/or random access memories (RAM). In one non-limiting example, the CNC controller 12 comprises a controller, sold under the tradename GE-FANUC 18i CNC, by GE-Fanuc, of Charlottesville, Virginia.

    [0016] In the illustrated example, the power supply 14 comprises a direct current (DC) pulse generator. The electrode 16 and the workpiece 101 are connected to negative and positive poles of the power supply 14 respectively so that the electrode 16 may function as a cathode and the workpiece 101 may act as an anode. In other examples, the polarities on the electrode 16 and the workpiece 101 may be reversed.

    [0017] The process controller 13 is connected to the power supply 14 to monitor the status of voltages and/or currents in a gap 17 between the electrode 16 and the workpiece 101 during machining so as to monitor the status of the machining process of the machining system 10. Additionally, the process controller 13 communicates with the CNC controller 12 so as to control the movement of the electrode 16 and the workpiece 101 based on the status of the voltages and/or currents in the gap 17 between the electrode 16 and the workpiece 101. In one non-limiting example, the process controller 13 comprises a controller, sold under the tradename NI CompactRIO (cRIO), by National Instruments Inc., of Austin, Texas.

    [0018] For some arrangements, each of the one or more controllers may comprise at least one of a computer, a database, and a processor. It should be noted that the present invention is not limited to any particular computer, database or processor for performing the processing tasks of the invention. The term "computer", as that term is used herein, is intended to denote any machine capable of performing the calculations, or computations, necessary to perform the tasks of the invention. The term "computer" is intended to denote any machine that is capable of accepting a structured input and of processing the input in accordance with prescribed rules to produce an output.

    [0019] In some examples, the electrolyte supply 15 may be in communication with and receive the pre-programmed instructions from the CNC controller 12 for passing an electrolyte between the electrode 16 and the workpiece 101. Alternatively, the electrolyte supply 15 may be disposed separately. Thus, during electroerosion machining, the power supply 14 may pass an electric current between the electrode 16 and the workpiece 10 to remove material from the workpiece 101 for forming a desired configuration while the electrolyte carries the removed material out of the gap 17. In non-limiting examples, the electrode 16 may have a cylindrical shape and comprise one or more of graphite, molybdenum, copper-graphite and copper-tungsten materials.

    [0020] In certain applications, when the machining system 10 functions as the conventional machining device, such as a milling machine to perform convention machining, the electrode 16 may be detached from the spindle of the machine tool 11 and a conventional cutting tool (not shown) may be assembled onto the machine tool 11 for the conventional machining. Non-limiting examples of the conventional cutting tool may include a drilling tool, a milling tool including a ball end mill or a flat end mill, or other suitable cutting tools.

    [0021] During the conventional machining, the CNC controller 12 may control the machine tool 11 to drive the cutting tool to machine the workpiece 101 while the electrolyte carries the removed material out of the gap 17, and the process controller 13 and the power supply 14 may not work. In some applications, at least one of the electrode 16 and the conventional cutting tool may be manually or automatically assembled onto and/or detached from the spindle of the machine tool 13.

    [0022] FIGS. 2-3 illustrate schematic perspective diagrams of a workpiece 101 and a solid model of a conduit 20 of the workpiece 101. As depicted in FIGS. 2-3, the workpiece 101 comprises an impeller of a centrifugal compressor (not shown). The impeller 101 comprises seventeen conduits 20 through which compressed fluids pass. Each of the conduits 20 has a twisted complex geometry and comprises a trailing edge 21 and a leading edge 22. The machining system 10 is configured to machine the conduits 20 with twisted complex geometries within the impeller 101. In one example, each conduit 20 is a sinuous conduit.

    [0023] For the illustrated arrangements, each of the conduits 20 is a through hole with a closed periphery. In certain applications, each of one or more of the conduits 20 may be a through hole with at least a portion of the periphery opened.

    [0024] FIG. 4 illustrates a schematic plane view illustrating machining of a conduit 20 of the workpiece 101 shown in FIGS. 2-3. As illustrated in FIG. 4, prior to machining, the position and dimensions of the conduit 20 may be identified and the conduit 20 is segmented into seven target zones (segments) Z1, Z2, Z3, Z4, Z5, Z6 and Z7 according to the pre-programmed instructions in the CNC controller 12 based on descriptions of the conduit 20 of the impeller 101 in a computer-aided design (CAD) and/or a computer-aided manufacturing (CAM). In some applications, the segmentation of the conduit 20 may be determined based on experiments and/or experiences to avoid interference of the conduit 20 and the cutting tool such as the electrode 16 and/or the milling tool during machining.

    [0025] During machining, as illustrated in FIGS. 1-4, the machining system 10 employs a first electroerosion machining to begin to machine the impeller 101 from the trailing edge 21. Meanwhile, the CNC controller 12 controls the machine tool 11 to drive the electrode 16 and the workpiece 101 to move relative to each other. The power supply 14 passes an electric current between the electrode 16 and the impeller 101 to remove materials from the first target zone Z1 to define a first cavity 23 within the first target zone Z1 along a first direction U while the electrolyte from the electrolyte supply 15 carries the removed materials out of the gap 17 between the electrode 16 and the impeller 101. The process controller 13 monitors the status o voltages and/or currents in the gap 17 and communicates with the CNC controller 12 to control the movement of the electrode 16 and the workpiece 101.

    [0026] Similarly to the first electroerosion machining of the first target zone Z1, after formation of the first cavity 23, the machining system 10 employs a second electroerosion machining to machine the second target zone Z2 from the leading edge 22 so as to create a second cavity 24 within the second target zone Z2 along a second direction P. In certain applications, the first direction U and the second direction P are opposite directions. The sequence for the electroerosion machining of the target zones Z1 and Z2 may be reversed.

    [0027] In non-limiting examples, after the first and second electroerosion machining of the first and second target zones Z1 and Z2, dimensions of the formed first and second cavities 23, 24 may be smaller than pre-determined dimensions of respective portions of the conduit 20. In one non-limiting example, allowances may remain to be about 2mm compared to the pre-determined dimensions of the conduit 20 after the electroerosion machining.

    [0028] Accordingly, in certain examples, the electrode 16 may be detached from the machining system 10, and the conventional cutting tool, such as the milling tool may be assembled onto the machine tool 11 to perform first and second conventional machining to machine the first and second cavities 23, 24 along opposite directions so as to remove respective allowances. In certain applications, the milling tool may be employed to machine a cavity after the cavity is defined via a first electroerosion machining and prior to the formation of a next cavity via a second electroerosion machining. For example, the milling tool may be used to machine the cavity 23 after the cavity 23 is formed and prior to the formation of the second cavity 24.

    [0029] For the illustrated arrangement in FIG. 4, after machining of first and second target zones Z1 and Z2, the milling tool and the electrode 16 may be detached from and assembled onto the machine tool 11 respectively, so that the machining system 10 further employs third and fourth electroerosion machining to machine the third target zone Z3 through the first cavity 23 and the fourth target zone Z4 through the second cavity 24 to define a third cavity 25 within the third target zone Z3 and a fourth cavity 26 within the fourth target zone Z4, respectively. In some examples, the subsequence of the third and fourth electroerosion machining of the third and fourth target zones Z3 and Z4 may be changed. In some applications, the machining system 10 may further employ the milling tool to perform third and fourth conventional machining to mill the third and fourth cavities 25, 26 remove at least a portion of respective allowances.

    [0030] Next, the machining system 10 employs fifth and sixth electroerosion machining to define a fifth cavity 27 within the fifth target zone Z5 and a sixth cavity 28 within the sixth target zone Z6, and employs the milling tool to perform fifth and sixth conventional machining to machine the fifth and sixth cavities 27, 28 to remove at least a portion of respective allowances after the electroerosion machining of the fifth and sixth cavities 27, 28.

    [0031] Finally, the machining system 10 employs the electroerosion machining and the milling tool seventhly in turn to define a seventh cavity 29 within the seventh target zone Z7 along the direction U. Accordingly, the seven cavities 23-29 are defined to communicate with each other to form the conduit 20 via alternating employment of the electroerosion machining and the conventional machining in the machining system 10. For some arrangements, the seven cavities may be machined separately according to the segmentation of the conduit 20 and the adjacent target zones in the conduit may be machined in different machining sequences, for example, the adjacent target zones Z2 and Z4 are machined in the second and fourth machining sequences respectively.

    [0032] In some applications, after the electroerosion machining, the milling tool may remove a portion, such as about 1.5mm of the allowances in the one or more respective cavities 23-29, which may be regarded as semifinishing of the one or more cavities 23-29. As a result, the machining system 10 may further employ the milling tool to machine the one or more of the cavities 23-29 to remove the respective residual allowances thereof for finish machining of the one or more cavities 23-29 to define the conduit 20 with pre-determined dimensions.

    [0033] For the arrangements illustrated in FIGS. 2-4, the machining of one conduit 20 is taken as an example. When machining more than one, such as all of the seventeen conduits 20 within the impeller 101, the machining system 10 employs the first and second electroerosion machining to machine the seventeen first target zones Z1 from the respective trailing edges 21 to define the seventeen first cavities 23 and machine the seventeen second target zones Z2 from the respective leading edges 22 to define the seventeen second cavities 24 in turn.

    [0034] Then, the machining system 10 may employ the milling tool to machine the seventeen first cavities 23 and the seventeen second cavities 24 to remove respective allowances. Subsequently, similar to the machining of all of the first and second cavities 23, 24, the machining system 10 may perform the electroerosion machining and the milling machining alternately to define all of the third, fourth, fifth, sixth and seventh cavities.

    [0035] In non-limiting examples, after the seven cavities 23-29 of each of the seventeen conduits 20 are machined, the machining system 10 may further employ the milling tool for finish machining of the seven cavities 23-29 of each of the seventeen conduits 20 so as to define each of the seventeen conduits 20 with desired dimensions.

    [0036] It should be noted that the arrangements in FIGS. 2-4 are merely illustrative. In certain applications, the milling machining for semifinishing and/or finish machining of the one or more cavities 23-29 may not be employed. The machining sequences of the cavities, such as the cavities 23 and 24, 25 and 26, and/or 27 and 28 may be reversed. The cavity 29 may be defined along the direction P. Additionally, the conduit 20 may be segmented into at least two target zones, so that the machining system 10 may employ the electromachining to machine the at least two target zones from opposite directions so as to define at least two cavities. A conventional machining may further be employed for semifinishing and/or finish machining of the two cavities to define the desired conduit, and the at least two target zones may or may not be contiguous.

    [0037] In embodiments of the invention, the machining system 10 may first employ electroerosion machining to define at least two cavities within at least two respective target zones from different directions. In non-limiting examples, the conventional machining may then be employed for semifinishing and/or finish machining of the at least two cavities so as to define a conduit in a workpiece. Compared to the conventional full milling processes, the electroerosion machining has higher efficiency and roughing steps such as milling flat and drilling through hole(s) in the conventional full mill processes may not be employed in the machining system 10, so that the machining cycle time may be reduced. Additionally, the arrangements of the invention may be used to retrofit the conventional CNC milling machine.

    [0038] While the disclosure has been illustrated and described in typical embodiments, it is not intended to be limited to the details shown, since various modifications and substitutions can be made without departing in any way from the spirit of the present disclosure. As such, further modifications and equivalents of the disclosure herein disclosed may occur to persons skilled in the art using no more than routine experimentation, and all such modifications and equivalents are believed to be within the scope of the disclosure as defined by the following claims.


    Claims

    1. A machining system (10) for machining a workpiece (101) to form one or more conduits, the machining system (10) comprising:

    a machine tool (11);

    a plurality of cutting tools configured to machine the workpiece (101) to form the one or more conduits, the plurality of tools comprising an electrode (16) disposed on the machine tool (11);

    a CNC controller (12) configured to control the machine tool (11) to move the respective cutting tools relative to the workpiece (101) and identify position and dimensions of each of the one or more conduits to be formed in the workpiece (101), each of the one or more conduits comprising at least two target zones;

    a process controller (13) configured to monitor gap (17) status between the electrode (16) and the workpiece (101), and communicate with the CNC controller (12) to control the machine tool (11); and

    an electrolyte supply (15) configured to pass an electrolyte between the workpiece (101) and the respective cutting tools;

    a power supply (14) configured to energize the electrode (16) and the workpiece (101) to opposite electrical polarities and pass an electric current between the electrode (16) and the workpiece (101) to remove materials from a first target zone to define a first cavity within the first target zone of the at least two target zones of each of the one or more conduits to be formed; and

    a conventional cutting tool exchangeably disposed on the machine tool (11) configured to perform a first mechanical machining step on the first cavity within the first target zone of each of the one or more conduits to be formed;wherein the machine tool (11), the electrode (16), the CNC controller (12), the power supply (14), the process controller (13) and the electrolyte supply (15) are configured to cooperate to function as an electroerosion machining device; and the machine tool (11), the CNC controller (12), the conventional cutting tool and the electrolyte supply (15) are configured to cooperate to function as a conventional machining device; and wherein the machining system (10) is configured to function alternately as the electroerosion machining device and the conventional machining device;

    wherein the power supply is further configured to pass the electric current between the electrode and the workpiece to remove materials from a second target zone to define a second cavity within the second target zone of the at least two target zones of each of the one or more conduits to be formed, and wherein the mechanical cutting tool is further configured to perfom a second mechanical machining step on the second cavity within the second target zone of each of the one or more conduits to be formed, and

    wherein the first cavity and the second cavity are defined within the at least two respective target zones along opposite directions.


     
    2. The machining system (10) of claim 1, wherein the conventional cutting tool comprises a milling tool.
     
    3. The machining system (10) of claim 1, wherein the electroerosion machining device is configured to machine a plurality of target zones within a workpiece (101) to define a plurality of cavities, and wherein the conventional machining device is configured to machine the plurality of cavities.
     
    4. A method for making a machined workpiece (101) comprising one or more conduits, the method comprising:

    identifying the position and dimensions of each of the one or more conduits to be formed in a workpiece (101), each of the one or more conduits to be formed comprising at least two target zones;

    performing a first electroerosion machining step to define a first cavity within a first target zone of each of the one or more conduits to be formed;

    performing a second electroerosion machining step to define a second cavity within a second target zone of each of the one or more conduits to be formed, wherein the electroerosion machining step is performed by an electroerosion machining device comprising a machine tool (11), an electrode (16), a CNC controller (12), a power supply (14), a process controller (13) and an electrolyte supply (15);

    passing an electric current between the electrode (16) and the workpiece (101) to remove materials from the second target zone;

    performing a first conventional machining step on the first cavity within the first target zone of each of the one or more conduits to be formed; and

    performing a second conventional machining step on the second cavity within the second target zone of each of the one or more conduits to be formed,

    wherein the conventional machining step is performed by a machining device comprising the machine tool (11), the CNC controller (12), a conventional cutting tool and the electrolyte supply;

    wherein the first cavity and the second cavity are defined within the at least two respective targets along opposite directions.


     
    5. The method of claim 4, wherein the first and second electroerosion machining steps, and the first and second conventional machining steps are performed along opposite directions respectively.
     
    6. The method of claim 4, wherein the first conventional machining step is performed between the first electroerosion machining step and the second electroerosion machining step.
     
    7. The method of claim 4, wherein the first target zone is not contiguous with the second target zone.
     
    8. The method of claim 4, further comprising performing a conventional machining step on the at least two cavities of each of the one or more conduits to be formed after the at least two cavities are machined by former conventional machining steps.
     
    9. The method of claim 4, wherein the machined workpiece (101) comprises more than one conduit, and wherein each conduit is segmented into seven target zones.
     
    10. The method of claim 9, further comprising repeating the steps of performing the first electroerosion machining step, performing the second electroerosion machining step, performing the frist conventional machining step, and performing the second conventional machining step to define third, fourth, fifth, sixth and seventh cavities within the respective target zones respectively.
     
    11. The method of claim 10, wherein the electroerosion machining steps are configured to machine the seven target zones along opposite directions.
     
    12. The method of claim 4, wherein the conventional machining steps comprise milling machining steps.
     
    13. The method of claim 4, wherein the conventional machining steps are configured to machine the first and second cavities refinedly after the first and second cavities are formed via the electroerosion machining steps.
     
    14. The method of claim 4, wherein adjacent target zones of the at least two target zones are machined in different machining sequences.
     
    15. The method of claim 4, wherein the at least one of the one or more conduits is sinuous.
     


    Ansprüche

    1. Bearbeitungssystem (10) zum Bearbeiten eines Werkstücks (101) zur Bildung einer oder mehrerer Leitungen, wobei das Bearbeitungssystem (10) umfasst:

    eine Werkzeugmaschine (11);

    eine Vielzahl von Schneidwerkzeugen, die so konfiguriert sind, dass sie das Werkstück (101) bearbeiten, um die eine oder mehreren Leitungen zu bilden, wobei die Vielzahl von Werkzeugen eine Elektrode (16) umfassen, die auf der Werkzeugmaschine (11) angeordnet ist;

    eine CNC-Steuerung (12), die so konfiguriert ist, dass sie die Werkzeugmaschine (11) so steuert, dass sie die jeweiligen Schneidwerkzeuge relativ zu dem Werkstück (101) bewegt und die Position und die Abmessungen jedes der einen oder mehreren Leitungen, die in dem Werkstück (101) zu bilden sind, identifiziert, wobei jede der einen oder mehreren Leitungen mindestens zwei Zielzonen umfasst;

    eine Verfahrenssteuerung (13), die so konfiguriert ist, dass sie den Zustand eines Spalts (17) zwischen der Elektrode (16) und dem Werkstück (101) überwacht und mit der CNC-Steuerung (12) kommuniziert, um die Werkzeugmaschine (11) zu steuern; und

    eine Elektrolytzufuhr (15), die so konfiguriert ist, dass ein Elektrolyt zwischen dem Werkstück (101) und den jeweiligen Schneidwerkzeugen hindurchgeführt wird;

    ein Netzteil (14), das konfiguriert ist, um die Elektrode (16) und das Werkstück (101) mit entgegengesetzten elektrischen Polaritäten zu erregen und einen elektrischen Strom zwischen der Elektrode (16) und dem Werkstück (101) zu leiten, um Materialien aus einer ersten Zielzone zu entfernen, um einen ersten Hohlraum innerhalb der ersten Zielzone der mindestens zwei Zielzonen von jeder der einen oder mehreren zu bildenden Leitungen zu definieren; und

    ein konventionelles Schneidwerkzeug, das austauschbar an der Werkzeugmaschine (11) angeordnet ist, die so konfiguriert ist, dass sie einen ersten mechanischen Bearbeitungsschritt am ersten Hohlraum innerhalb der ersten Zielzone jeder der einen oder mehreren zu bildenden Leitungen durchführt; wobei die Werkzeugmaschine (11), die Elektrode (16), die CNC-Steuerung (12), das Netzteil (14), die Verfahrenssteuerung (13) und die Elektrolytzufuhr (15) so konfiguriert sind, dass sie zusammenwirken, um als Elektroerosionsbearbeitungsvorrichtung zu funktionieren; und die Werkzeugmaschine (11), die CNC-Steuerung (12), das konventionelle Schneidwerkzeug und die Elektrolytzufuhr (15) so konfiguriert sind, dass sie zusammenwirken, um als eine konventionelle Bearbeitungsvorrichtung zu funktionieren; und wobei das Bearbeitungssystem (10) so konfiguriert ist, dass es abwechselnd als die Elektroerosionsbearbeitungsvorrichtung und die konventionelle Bearbeitungsvorrichtung funktioniert;

    wobei das Netzteil ferner so konfiguriert ist, dass es den elektrischen Strom zwischen der Elektrode und dem Werkstück leitet, um Materialien aus einer zweiten Zielzone zu entfernen, um einen zweiten Hohlraum innerhalb der zweiten Zielzone der mindestens zwei Zielzonen jeder der einen oder mehreren zu bildenden Leitungen zu definieren, und wobei das mechanische Schneidwerkzeug ferner so konfiguriert ist, dass es einen zweiten mechanischen Bearbeitungsschritt an dem zweiten Hohlraum innerhalb der zweiten Zielzone jeder der einen oder mehreren zu bildenden Leitungen ausführt, und

    wobei der erste Hohlraum und der zweite Hohlraum innerhalb der mindestens zwei jeweiligen Zielzonen entlang entgegengesetzter Richtungen definiert sind.


     
    2. Bearbeitungssystem (10) nach Anspruch 1, wobei das konventionelle Schneidwerkzeug ein Fräswerkzeug umfasst.
     
    3. Bearbeitungssystem (10) nach Anspruch 1, wobei die Elektroerosionsbearbeitungsvorrichtung so konfiguriert ist, dass sie eine Vielzahl von Zielzonen innerhalb eines Werkstücks (101) bearbeitet, um eine Vielzahl von Hohlräumen zu definieren, und wobei die konventionelle Bearbeitungsvorrichtung so konfiguriert ist, dass sie die Vielzahl von Hohlräumen bearbeitet.
     
    4. Verfahren zur Herstellung eines bearbeiteten Werkstücks (101), das eine oder mehrere Leitungen umfasst, wobei das Verfahren umfasst:

    Identifizieren der Position und der Abmessungen jeder der einen oder mehreren Leitungen, die in einem Werkstück (101) zu bilden sind, wobei jede der einen oder mehreren zu bildenden Leitungen mindestens zwei Zielzonen umfasst;

    Durchführen eines ersten Elektroerosionsbearbeitungsschritts zur Definition eines ersten Hohlraums innerhalb einer ersten Zielzone jeder der einen oder mehreren zu bildenden Leitungen;

    Durchführen eines zweiten Elektroerosionsbearbeitungsschritts, um einen zweiten Hohlraum innerhalb einer zweiten Zielzone jeder der einen oder mehreren zu bildenden Leitungen zu definieren, wobei der Elektroerosionsbearbeitungsschritt durch eine Elektroerosionsbearbeitungsvorrichtung durchgeführt wird, die eine Werkzeugmaschine (11), eine Elektrode (16), eine CNC-Steuerung (12), ein Netzteil (14), eine Verfahrenssteuerung (13) und eine Elektrolytzufuhr (15) umfasst;

    Leiten eines elektrischen Stroms zwischen der Elektrode (16) und dem Werkstück (101), um Materialien aus der zweiten Zielzone zu entfernen;

    Durchführen eines ersten konventionellen Bearbeitungsschritts an dem ersten Hohlraum innerhalb der ersten Zielzone jeder der einen oder mehreren zu bildenden Leitungen; und

    Durchführen eines zweiten konventionellen Bearbeitungsschritts an dem zweiten Hohlraum innerhalb der zweiten Zielzone jeder der einen oder mehreren zu bildenden Leitungen,

    wobei der konventionelle Bearbeitungsschritt durch eine Bearbeitungsvorrichtung durchgeführt wird, die die Werkzeugmaschine (11), die CNC-Steuerung (12), ein konventionelles Schneidwerkzeug und die Elektrolytzufuhr umfasst;

    wobei der erste Hohlraum und der zweite Hohlraum innerhalb der mindestens zwei jeweilige Ziele entlang entgegengesetzter Richtungen definiert sind.


     
    5. Verfahren nach Anspruch 4, wobei der erste und der zweite Elektroerosionsbearbeitungsschritt und der erste und der zweite konventionelle Bearbeitungsschritt jeweils entlang entgegengesetzter Richtungen durchgeführt werden.
     
    6. Verfahren nach Anspruch 4, wobei der erste konventionelle Bearbeitungsschritt zwischen dem ersten Elektroerosionsbearbeitungsschritt und dem zweiten Elektroerosionsbearbeitungsschritt durchgeführt wird.
     
    7. Verfahren nach Anspruch 4, wobei die erste Zielzone nicht an die zweite Zielzone angrenzt.
     
    8. Verfahren nach Anspruch 4, ferner umfassend das Durchführen eines konventionellen Bearbeitungsschritts an den mindestens zwei Hohlräumen jeder der einen oder mehreren zu bildenden Leitungen, nachdem die mindestens zwei Hohlräume durch frühere konventionelle Bearbeitungsschritte bearbeitet wurden.
     
    9. Verfahren nach Anspruch 4, wobei das bearbeitete Werkstück (101) mehr als eine Leitung umfasst und wobei jede Leitung in sieben Zielzonen segmentiert ist.
     
    10. Verfahren nach Anspruch 9, ferner umfassend das Wiederholen der Schritte des Durchführens des ersten Elektroerosionsbearbeitungsschritts, des Durchführens des zweiten Elektroerosionsbearbeitungsschritts, des Durchführens des ersten konventionellen Bearbeitungsschritts und des Durchführens des zweiten konventionellen Bearbeitungsschritts zur Definition dritter, vierter, fünfter, sechster und siebter Hohlräume innerhalb der jeweiligen Zielzonen.
     
    11. Verfahren nach Anspruch 10, wobei die Elektroerosionsbearbeitungsschritte so konfiguriert sind, dass die sieben Zielzonen entlang entgegengesetzter Richtungen bearbeitet werden.
     
    12. Verfahren nach Anspruch 4, wobei die konventionellen Bearbeitungsschritte Fräsbearbeitungsschritte umfassen.
     
    13. Verfahren nach Anspruch 4, wobei die konventionellen Bearbeitungsschritte so konfiguriert sind, dass die ersten und zweiten Hohlräume nach der Bildung der ersten und zweiten Hohlräume mittels der Elektroerosionsbearbeitungsschritte verfeinernd bearbeitet werden.
     
    14. Verfahren nach Anspruch 4, wobei benachbarte Zielzonen der mindestens zwei Zielzonen in unterschiedlichen Bearbeitungsabfolgen bearbeitet werden.
     
    15. Verfahren nach Anspruch 4, wobei mindestens eine der einen oder mehreren Leitungen gewunden ist.
     


    Revendications

    1. Système d'usinage (10) destiné à usiner une pièce (101) afin de former un ou plusieurs conduits, le système d'usinage (10) comprenant :

    une machine-outil (11) ;

    une pluralité d'outils de découpe conçus pour usiner la pièce (101) afin de former le ou les conduits, la pluralité d'outils comprenant une électrode (16) disposée sur la machine-outil (11) ;

    un contrôleur CNC (12) configuré pour commander la machine-outil (11) afin de déplacer les outils de découpe respectifs par rapport à la pièce (101) et d'identifier la position et les dimensions de chacun du ou des conduits à former au sein de la pièce (101), chacun du ou des conduits comprenant au moins deux zones cibles ;

    un contrôleur de processus (13) configuré pour surveiller un statut d'espace (17) entre l'électrode (16) et la pièce (101) et pour communiquer avec le contrôleur CNC (12) de façon à commander la machine-outil (11) ; et

    une alimentation en électrolyte (15) conçue pour faire passer un électrolyte entre la pièce (101) et les outils de découpe respectifs ;

    une alimentation électrique (14) conçue pour fournir de l'énergie à l'électrode (16) et à la pièce (101) selon des polarités électriques opposées et pour faire passer un courant électrique entre l'électrode (16) et la pièce (101) de façon à éliminer des matériaux d'une première zone cible afin de définir une première cavité dans la première zone cible des au moins deux zones cibles de chacun du ou des conduits à former ; et

    un outil de découpe classique disposé de manière échangeable sur la machine-outil (11) et conçu pour exécuter une première étape d'usinage mécanique sur la première cavité dans la première zone cible de chacun du ou des conduits à former ; dans lequel la machine-outil (11), l'électrode (16), le contrôleur CNC (12), l'alimentation électrique (14), le contrôleur de processus (13) et l'alimentation en électrolyte (15) sont conçus pour coopérer afin de fonctionner comme un dispositif d'usinage par électroérosion ; et la machine-outil (11), le contrôleur CNC (12), l'outil de découpe classique et l'alimentation en électrolyte (15) sont conçus pour coopérer afin de fonctionner comme un dispositif d'usinage classique ; et dans lequel le système d'usinage (10) est conçu pour fonctionner par alternance comme dispositif d'usinage par électroérosion et comme dispositif d'usinage classique ;

    dans lequel l'alimentation électrique est en outre conçue pour faire passer le courant électrique entre l'électrode et la pièce afin d'éliminer des matériaux d'une deuxième zone cible, de façon à définir une deuxième cavité dans la deuxième zone cible des au moins deux zones cibles de chacun du ou des conduits à former et dans lequel l'outil de découpe mécanique est en outre conçu pour exécuter une seconde étape d'usinage mécanique sur la deuxième cavité dans la deuxième zone cible de chacun du ou des conduits à former et

    dans lequel la première cavité et la deuxième cavité sont définies dans les au moins deux zones cibles respectives dans des directions opposées.


     
    2. Système d'usinage (10) selon la revendication 1, dans lequel l'outil de découpe classique comprend un outil de fraisage.
     
    3. Système d'usinage (10) selon la revendication 1, dans lequel le dispositif d'usinage par électroérosion est conçu pour usiner une pluralité de zones cibles au sein d'une pièce (101) afin de définir une pluralité de cavités et dans lequel le dispositif d'usinage classique est conçu pour usiner la pluralité de cavités.
     
    4. Procédé de fabrication d'une pièce usinée (101) comprenant un ou plusieurs conduits, le procédé comprenant :

    l'identification de la position et des dimensions de chacun du ou des conduits à former au sein d'une pièce (101), chacun du ou des conduits à former comprenant au moins deux zones cibles ;

    l'exécution d'une première étape d'usinage par électroérosion afin de définir une première cavité dans une première zone cible de chacun du ou des conduits à former ;

    l'exécution d'une seconde étape d'usinage par électroérosion afin de définir une deuxième cavité dans une deuxième zone cible de chacun du ou des conduits à former, dans lequel l'étape d'usinage par électroérosion est exécutée par un dispositif d'usinage par électroérosion comprenant une machine-outil (11), une électrode (16), un contrôleur CNC (12), une alimentation électrique (14), un contrôleur de processus (13) et une alimentation en électrolyte (15) ;

    la circulation d'un courant électrique entre l'électrode (16) et la pièce (101) afin d'éliminer des matériaux de la deuxième zone cible ;

    l'exécution d'une première étape d'usinage classique sur la première cavité dans la première zone cible de chacun du ou des conduits à former ; et

    l'exécution d'une seconde étape d'usinage classique sur la deuxième cavité dans la deuxième zone cible de chacun du ou des conduits à former,

    dans lequel l'étape d'usinage classique est exécutée par un dispositif d'usinage comprenant la machine-outil (11), le contrôleur CNC (12), un outil de découpe classique et l'alimentation en électrolyte ;

    dans lequel la première cavité et la deuxième cavité sont définies dans les au moins deux zones cibles respectives dans des directions opposées.


     
    5. Procédé selon la revendication 4, dans lequel la première et la seconde étape d'usinage par électroérosion et la première et la seconde étape d'usinage classique sont respectivement exécutées dans des directions opposées.
     
    6. Procédé selon la revendication 4, dans lequel la première étape d'usinage classique est exécutée entre la première étape d'usinage par électroérosion et la seconde étape d'usinage par électroérosion.
     
    7. Procédé selon la revendication 4, dans lequel la première zone cible n'est pas contiguë à la deuxième zone cible.
     
    8. Procédé selon la revendication 4, comprenant en outre l'exécution d'une étape d'usinage classique sur les au moins deux cavités de chacun du ou des conduits à former après que les au moins deux cavités ont été usinées par les précédentes étapes d'usinage classique.
     
    9. Procédé selon la revendication 4, dans lequel la pièce (101) usinée comprend plusieurs conduits et dans lequel chaque conduit est segmenté en sept zones cibles.
     
    10. Procédé selon la revendication 9, comprenant en outre la répétition des étapes d'exécution de la première étape d'usinage par électroérosion, de la seconde étape d'usinage par électroérosion, de la première étape d'usinage classique et de la seconde étape d'usinage classique afin de définir respectivement une troisième, une quatrième, une cinquième, une sixième et une septième cavité dans les zones cibles respectives.
     
    11. Procédé selon la revendication 10, dans lequel les étapes d'usinage par électroérosion sont conçues pour usiner les sept zones cibles dans des directions opposées.
     
    12. Procédé selon la revendication 4, dans lequel les étapes d'usinage classique comprennent des étapes d'usinage par fraisage.
     
    13. Procédé selon la revendication 4, dans lequel les étapes d'usinage classique sont conçues pour usiner la première et la deuxième cavité de manière plus fine après que la première et la deuxième cavité ont été formées via les étapes d'usinage par électroérosion.
     
    14. Procédé selon la revendication 4, dans lequel les zones cibles adjacentes des au moins deux zones cibles sont usinées dans le cadre de séquences d'usinage différentes.
     
    15. Procédé selon la revendication 4, dans lequel le au moins l'un du ou des conduits est sinueux.
     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description