(19)
(11)EP 2 576 117 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
20.05.2020 Bulletin 2020/21

(21)Application number: 11707837.8

(22)Date of filing:  08.03.2011
(51)International Patent Classification (IPC): 
B23F 9/00(2006.01)
B23F 9/08(2006.01)
B23F 9/02(2006.01)
B23F 15/06(2006.01)
(86)International application number:
PCT/EP2011/053406
(87)International publication number:
WO 2011/147600 (01.12.2011 Gazette  2011/48)

(54)

A METHOD FOR GENERATING OF NON-STRAIGHT GEAR TEETH

VERFAHREN ZUR ERZEUGUNG VON UNGERADEN ZAHNRADZÄHNEN

PROCÉDÉ POUR PRODUIRE DES DENTS D'ENGRENAGE NON RECTILIGNES


(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: 28.05.2010 PL 39117910

(43)Date of publication of application:
10.04.2013 Bulletin 2013/15

(73)Proprietor: Klingelnberg AG
8050 Zürich (CH)

(72)Inventor:
  • ZAREBSKI, Igor
    26-652 Cerekiew (PL)

(74)Representative: Heusch, Christian et al
Ant-IP GmbH Kirchplatz 2
82387 Antdorf
82387 Antdorf (DE)


(56)References cited: : 
EP-A1- 0 330 289
BE-A- 344 361
US-A- 5 941 124
WO-A1-2011/017301
GB-A- 1 499 988
  
  • STADTFELD H J: "THE BASICS OF SPIRAL BEVEL GEARS", GEAR TECHNOLOGY, RANDALL PUBLISHING CO. ELK GROVE, ILLINOIS, US, vol. 18, no. 1, 1 January 2001 (2001-01-01), pages 31-38, XP001063413, ISSN: 0743-6858
  
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


[0001] The present application claims the priority of the patent application P-391179, with title "Metoda obwiedniowa obrobki uzebien nieprostych", which was filed on 28 May 2010 in Poland in the name of the inventor of the present application. The respective application and the right to claim the priority have been assigned to the applicant of the present application.

FIELD OF THE INVENTION



[0002] The present invention is a method for generating of non-straight gear teeth on multi-axis machines with disk cutters, which might be used for parts like e.g. bevel gears or face gears with non-straight teeth. The term non-straight teeth refers to such teeth wherein the tooth lines are not placed along the creator lines of the pitch surface of the gear, according to the classification in the book Och

duszko K.: Ko

a z

bate, Tom 1. Konstrukcja. WNT, Warszawa, 1985. This book concerns the designing of gears.

BACKGROUND OF THE INVENTION



[0003] GB 1 499 988 shows a gear teeth generation method for generating non-straight gear teeth according to the preamble of claim 1.

[0004] It is known from U.S. pat. no 7,364,391 to produce bevel gears by providing a multi-axis free form gear cutting machine and a single disk cutter. The single disk cutter is positioned relative to the workpiece so that it cuts the first part of the gap. The tool and the workpiece are then re-positioned so that the remaining part of the gap is cut. Initially, a first transformation is made from the machine axes settings of the first cutter of the conventional machine to the co-ordinates of the theoretical cradle type basic machine. These basic settings are then transformed to the multi-axis machine settings and the first part of a gap is cut. Next a series of transformations is made similarly in order to cut the remaining portion of the gap. This method could be used also for grinding, because it converts machining with two interlocking tools to machining with a single tool.

[0005] It is known from Och

duszko K.: Ko

a z

bate, Tom 2. Wykonanie i montaz. WNT, Warszawa, 1976, which is a book on gear technology, to manufacture gear teeth by using profile and generating methods. In case of profile methods the tooth profile results from the tool profile. In case of generating methods the tooth profile is generated, being created as an envelope of consecutive positions of the tool profile. Here, besides the cutting motion of the tool, a roll motion is carried out (the generating motion). The generating motion consists of a rotary motion of the workpiece and a transverse motion.

[0006] It is known in the industry (source: Och

duszko K.: Ko

a z

bate, Tom 2. Wykonanie i montaz. WNT, Warszawa, 1976) to machine gear teeth by using generating methods and disk tools. There are appropriate tools available, for green machining (e.g. disk milling cutters) as well as for finishing machining (e.g. disk grinding wheels). There are also machine tools available, which provide appropriate work motions made by the tool relative to the workpiece, resulting in machining of the workpiece. Among the generating methods that allow for cutting of correct bottom land shape, MAAG, NILES and KOLB methods are known.

[0007] Prior art methods for generating of gear teeth with disk tools did not utilize the synchronization between the lengthwise motion and the roll motion, which caused the total work travel of the machine, required for complete generating of the tooth flank, to be relatively long. In case of the American patent no US 7,364,391, discussed earlier, the lengthwise travel is zero and the tool is positioned in the middle of the teeth width, which causes the bottom land to reflect the shape of the tool and therefore it is concave curved, which is detrimental to gear's strength.

[0008] The inconvenience of the prior art methods for generating of the gear teeth with correct bottom land shape using disk tools is that at least one component motion of the work motion is oscillatory, and therefore it is carried out many times at each gap being machined, which is required in order to completely generate the flank surface, and so it takes consequently relatively big amount of time, reducing productivity of those methods.

[0009] The goal of the present invention is to utilize motions for generating of the non-straight gear teeth with disk tools, which motions do not have an oscillatory component motion, nevertheless, a complete generation of flank surfaces is secured, and therefore the amount of machining time required is reduced.

[0010] The substance of the method for generating of non-straight gear teeth on multi-axis machines using disk tools, as of the present invention, is that a disk tool is travelling along the gear tooth where its motion along the gap is synchronized with the roll motion so that the pressure line is on the machining surface of the disk tool, the disk tool is machining the bottom land surface of the tooth with its perimeter, wherein the machining of the flank of the tooth starts with the disk tool positioned with reference to the gear tooth so that the pressure line is near the edge of the tooth flank, and consecutively the mutual positions of the disk tool and the gear tooth are changed to cause the pressure line to move further away from the edge of the tooth flank, and the machining of the tooth flank is finished when the pressure line reaches the opposite edge of the gear flank. Furthermore, the positions of the tooth flank and the disk tool are so that at every stage of machining of the tooth flank the pressure line is on the machining surface of the disk tool. The disk tool may also not machine the bottom land surface with its perimeter. At every stage of machining of the tooth flank one pressure line is used. Selecting of consecutive pressure lines in machining of the tooth flank causes the consecutive selected pressure lines to be the creators of the surface of the tooth flank.

[0011] When compared to the prior art methods, the machining time in case of the present invention method is substantially reduced. The method is suitable only for non-straight gear teeth.

[0012] In the described method, one flank of the gap is completely machined in one work stroke. Should the next flank be machined, then the second work stroke is required. If for some reasons the diameter of the disk tool is too small to cover the entire pressure line, then in order to completely machine the flank of the gap additional work strokes are needed. However, due to the lack of the oscillatory component motion, the additional travel will be always shorter, and hence the machining time will be shorter when compared to the prior art methods.

[0013] The procedure as described above is then repeated for each gap, and the entire gear is therefore machined.

BRIEF DESCRIPTION OF THE DRAWINGS



[0014] One embodiment of the invention is described below by reference to the drawings, wherein:
FIG. 1
shows a schematic representation of the initial stage of the machining of the tooth's flank, according to the invention, where a disk tool cutter is employed;
FIG. 2
shows a schematic representation of the middle stage of the machining of the tooth's flank, according to the invention;
FIG. 3
shows a schematic representation of the completing stage of the machining of the tooth's flank, according to the invention;
FIG. 4
shows details regarding the positioning of the disk tool cutter relative to the toothing of a gear, according to the invention;
FIG. 5A
shows a top view of a disk tool cutter, according to the invention;
FIG. 5B
shows a side view of the disk tool cutter of Fig. 5A;
FIG. 6
shows a schematic representation of various known gear cutting methods versus the inventive gear cutting method;
FIG. 7
shows a perspective representation of a Klingelnberg bevel gear cutting machine, which could be used in connection with the present invention.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT



[0015] The substance of the invention is presented schematically in the figures, and so in the fig. 1 the initial stage of the machining of the tooth's flank is presented, in the fig. 2 the middle stage of the machining of the tooth's flank is presented, and in the fig. 3 the completing stage of the machining of the tooth's flank is presented.

[0016] All three figures 1, 2 and 3 show one gear tooth 2 as cut-out of a gear. This gear is a bevel gear with non-straight teeth 2. The tooth lines of these non-straight teeth 2 are not placed along the creator lines of the pitch surface of the gear.

[0017] A disk tool cutter 1, here represented by two concentric circles, is travelling along the gear tooth 2 where its motion along the tooth gap (L movement in lengthwise direction, cf. fig. 6) is synchronized with the roll motion (motions R and Q in fig. 6) so that the pressure line 3 is on the machining surface 4 of the disk tool cutter 1. The disk tool cutter 1 is machining the bottom land surface 6 of the tooth 2 with its perimeter 5, wherein the machining of the flank of the tooth 2 starts with the disk tool cutter 1 positioned with reference to the gear tooth 2 so that the pressure line 3 is near the edge 7 of the tooth flank 2 (cf. fig. 1), and consecutively the mutual positions of the disk tool cutter 1 and the gear tooth 2 are changed to cause the pressure line 3 to move further away from the edge 7 of the tooth flank 2, and the machining of the tooth flank 2 is finished when the pressure line 3 reaches the opposite edge 8 of the gear flank 2 (cf. fig. 3). Furthermore, the positions of the tooth flank 2 and the disk tool cutter 1 are so that at every stage of machining of the tooth flank 2 the pressure line 3 is on the machining surface 4 of the disk tool 1. The disk tool 1 may also not machine the bottom land surface 6 with its perimeter 5. At every stage of machining of the tooth flank 2 one pressure line 3 is used. Selecting of consecutive pressure lines 3 in machining of the tooth flank 2 causes the consecutive selected pressure lines 3 to be the creators of the surface of the tooth flank 2.

[0018] FIG. 4 shows details regarding the positioning of the disk tool cutter 1 relative to the toothing of a crown gear 10, according to the invention. The disk tool cutter 1 is here represented by its perimeter 5. The disk tool cutter 1 has a tool axis A1. The crown gear 10 is represented by the corresponding virtual plane gear 11. The virtual plane gear 11 is razor-thin (the actual thickness of the plane gear 11 is zero). The bevel gear pair comprising a crown gear 10 and a pinion 12 is precisely defined by the corresponding virtual plane gear 11 if the pitch cone angles are known. The crown gear 10 and pinion 12 forming a bevel gear pair both have the same number of plane gear teeth. A2 is the pinion axis and A3 is the crown gear axis. The axis A2 and A3 of the crown gear 10 and pinion 12 intersect, as illustrated in Fig. 4.

[0019] The inventive gear teeth generation method is carried out as described in connection with Figures 1 - 3. A gear cutting machine is employed which provides for the required movements of the disk tool cutter 1 relative to a workpiece centered around the crown gear axis A3. At every stage of machining of the tooth flank 2 on the workpiece one pressure line 3 is used. The pressure line is the line of contact between the machining surface 4 of the disk tool cutter 1 and the tooth flank to be produced. Selecting of consecutive pressure lines 3 in machining of the tooth flank 2 causes the consecutive selected pressure lines 3 to be the creators of the surface of the tooth flank 2, as described above.

[0020] FIG. 5A shows a top view of a preferred embodiment of a disk tool cutter 1, according to the invention. FIG. 5B shows a corresponding side view of the disk tool cutter 1 of Fig. 5A. The disk tool cutter 1 is mounted on a tool spindle (not shown) of a gear cutting machine. The tool axis A1 is caused by this machine to perform three-dimensional movements relative to the workpiece mentioned. The disk tool cutter 1 rotates around this tool axis A1 while being moved with its machining surface 4 along the tooth flanks to be produced.

[0021] As illustrated in Figures 5A and 5B, the disk tool cutter 1 might comprise cutting elements or blades 13 arranged along its perimeter 5. The machining surface 4 is here defined as the ring-shaped area between the outer perimeter 5 of the disk tool cutter 1 and the circle 9 (cf. fig. 5A). The circle 9 has a radius R1 which is smaller than the radius R2 of the outer perimeter 5. The cutting elements or blades 13 each have a cutting edge 14. The disk tool cutter 1 in Fig. 5A is designed to be rotated counter clockwise.

[0022] Each cutting element or blade 13 has at least one cutting edge 14. The cutting elements or blades 13 might have more than one cutting edge 14.

[0023] Instead of a disk tool cutter 1 with cutting elements or blades 13 a grinding wheel or disk could be used in the same manner as described above.

[0024] FIG. 6 shows a schematic representation of various known gear cutting methods versus the inventive gear cutting method. Please note that the main cutting surface 4 exists in the rear of the disk tool cutter 1. The main cutting surface 4 is thus not visible in Fig. 6. FIG. 6 comprises a table and a graphical representation showing a disk tool cutter 1 and two teeth of a gear. The same reference numbers are used in Fig. 6 as in the previous figures. The definitions and descriptions of the other figures are also applicable to the situation shown in Fig. 6. The arrows R and Q together represent the joint roll motion between disk tool cutter 1 and gear 10 to be produced. The joint roll motion is performed by the gear cutting machine. The arrow L represents the lengthwise motion of the disk tool cutter 1 relative to the gear 10. The lengthwise motion L is parallel to the pinion axis A2, i.e. this movement is perpendicular to the crown gear axis A3 (cf. Fig. 4).

[0025] The table in fig. 6 shows two different generating methods called MAAG methods. A distinction is made between the MAAG method as applied in case of small gear (gears with small diameters) and the MAAG method as applied in case of bigger gear (gears with larger diameters). A zigzag movement is carried out as a working stroke (see the column on the right hand side of the table). In case of small gears a first zigzag movement Z1 from right to left is performed whereas in case of big gears an up and down zigzag movement Z2 is carried out. During the generation of small gears the roll movements R and Q are quite fast as compared to the roll movements R and Q used for the generation for bigger gears. For small gears the lengthwise movement L is slow whereas for bigger gears this movement L is fast.

[0026] The Coniflex® generating method is also depicted in the table. The roll movements R and Q used for the Coniflex® generating method both are slow. L = 0, which means that no feed movement is carried out in the lengthwise direction. The resulting working stroke Z3 is a linear movement.

[0027] The inventive method is represented by the row at the bottom of the table of fig. 6. The roll movements R and Q used for the inventive method both are slow. The lengthwise movement L is slow, too. The resulting working stroke Z4 is a linear or slightly curved movement resulting from CNC-coordinated and coupled Q and L movements. As described above, the disk tool cutter 1 is travelling along the gear tooth 2 where its motion along the tooth gap (L movement in lengthwise direction) is synchronized with the roll motion (motions R and Q) so that the pressure line 3 (cf. Figures 1 - 3) is on the machining surface 4 of the disk tool cutter 1. The mutual (relative) positions of the disk tool cutter 1 and the gear tooth 2 are changed consecutively to cause the pressure line 3 to move further away from the edge 7 of the tooth flank 2 (cf. fig. 1), and the machining of the tooth flank 2 is finished when the pressure line 3 reaches the opposite edge 8 of the gear flank 2 (cf. fig. 3).

[0028] The disk tool 1, preferable a disk tool cutter 1 as shown in Figures 5A and 5B, can be used in connection with all embodiments of the invention.

[0029] FIG. 7 shows a perspective representation of a Klingelnberg bevel gear cutting machine 100 (e.g. a gear cutting machine 100 belonging to the C-family of Klingelnberg machines), which can be used in connection with the present invention. The gear cutting machine 100 is a CNC-controlled machine having six axes. At least five of these six axes can be caused by the CNC control of the machine 100 to perform coordinated and coupled simultaneous movements, as required when carrying out the inventive method.

[0030] The CNC-machine 100 can be used for cutting bevel gears 10, 12 with non-straight teeth, according to the invention. The CNC-machine 100 could have the following set-up/arrangement. A machine element 110 is arranged and guided so that it is able to perform a linear movement parallel to the straight axis X (1. axis). The machine element 110 is guided and mounted on a machine bed 104. A first sliding element 103 is mounted and guided by guides 105 so that it is able to carry out linear up and down movements parallel to the Z axis (2. axis). The guides 105 are positioned on a sloped side of the machine element 110. A spindle drive 101 is used to move the first sliding element 103 up and down.

[0031] A second sliding element 108 with a tool spindle is mounted on the machine bed 106. The second sliding element 108 is mounted and guided so that it can perform linear sliding movements parallel to a straight Y-axis (3. axis). The Y-axis is perpendicular to the X-axis. The second sliding element 108 is guided along guides 107. There is a pivoting element 109 carried by the second sliding element 108. The pivoting element 109 has a vertical pivot axis C (4. axis). The Z-axis is sloped with respect to the vertical pivot axis C.

[0032] The first sliding element 103 carries a tool spindle 111. The tool spindle causes a tool (e.g. the disk tool 1) to rotate around the tool axis A1 (5. axis). The workpiece 15 (here a pinion) is mounted on a workpiece spindle 102 carried by the second sliding element 108 and pivoting element 109. The workpiece spindle 102 together with the workpiece 15 is enabled to perform sliding movements parallel to the Y-axis and pivoting movements around the C-axis. The workpiece 15, mounted on the workpiece spindle 102, can perform a rotational movement around the axis A2 (6. axis). Please note that in fig. 7 the disk tool 1 is shown as a simple disk for sake of simplicity.

The list of reference numbers/signs:



[0033] 
1 -
disk tool or disk tool cutter,
2 -
gear teeth,
3 -
pressure line,
4 -
machining surface of disk tool (1),
5 -
perimeter of disk tool (1),
6 -
bottom land (2),
7 -
first edge,
8 -
opposite edge
9
circle
10
gear
11
virtual plane gear
12
pinion
13
cutting element or blade
14
cutting edge
15
workpiece
100
CNC-machine
101
spindle drive
102
workpiece spindle
103
first sliding element
104
machine bed
105
guides
106
machine bed
107
guides
108
second sliding element
109
pivoting element
110
machine element
111
tool spindle
A1
tool axis, 5. axis
A2
pinion axis, 6. axis
A3
crown gear axis
C
vertical pivot axis, 4. axis
R1
radius of the circle 9
R2
radius of the perimeter 5
X
1. axis
Y
3. axis
Z
2. axis
Z1
first zigzag movement
Z2
second zigzag movement
Z3
linear movement
Z4
linear or slightly curved movement



Claims

1. A gear teeth generation method for generating non-straight gear teeth, said method being carried out on a multi-axis machine (100), using a disk tool (1), wherein said disk tool (1) is travelling along a gear tooth (2) where its motion (L) along a gap adjacent to said gear tooth (2) is synchronized with a roll motion (R, Q) performed by said multi-axis machine so that the resulting working stroke (Z4) is a linear or curved movement wherein one work stroke and optionally additional work strokes are needed to completely machine a flank of said gap, characterised in that the mutual positions of the tooth flank and the disk tool (1) are changed so that at every stage of machining of the tooth flank a pressure line (3) is on a machining surface (4) of said disk tool (1), wherein the pressure line (3) is the line of contact between the machining surface (4) of the disk tool (1) and a tooth flank of the gear tooth (2) to be produced, wherein the machining of the tooth flank of the gear tooth (2) starts with the disk tool (1) positioned with reference to the gear tooth (2) so that the pressure line (3) is near a first edge (7) of the tooth flank, and consecutively the mutual positions of the disk tool (1) and the gear tooth (2) are changed to cause the pressure line (3) to move further away from the first edge (7) of the tooth flank (2), and the machining of the tooth flank is finished when the pressure line (3) reaches the opposite edge (8) of the tooth flank.
 
2. The method of claim 1, wherein said disk tool (1) does not machine a bottom land surface (6) with its perimeter (5).
 
3. The method of claim 1, wherein said disk tool (1) is machining a bottom land surface (6) of the tooth (2) with its perimeter (5).
 
4. The method of claim 1, wherein at every stage of machining of the tooth flank (2) one pressure line (3) is used.
 
5. The method of claim 1, wherein selecting of consecutive pressure lines (3) in machining of the tooth flank (2) causes the consecutive selected pressure lines (3) to be the creators of the surface of the tooth flank (2).
 
6. The method of one of the preceding claims, wherein a disk tool cutter (1) is used as disk tool, said disk tool cutter (1) comprising multiple cutting elements or blades (13) arranged along the perimeter (5) of the disk tool cutter (1), each cutting element or blade (13) having at least one cutting edge (14).
 
7. Use of the method of one of the preceding claims for the manufacturing of a bevel gear with non-straight teeth (2).
 
8. Use of the method of claim 1, for the manufacturing of a face gear with non-straight teeth (2).
 


Ansprüche

1. Ein Verzahnungsverfahren zur Erzeugung nicht-gerader Zahnradzähne, wobei das genannte Verfahren auf einer Mehrachsmaschine (100) unter Verwendung eines Scheibenwerkzeugs (1) ausgeführt wird, wobei das genannte Scheibenwerkzeug (1) entlang eines Zahnradzahnes (2) fährt wo seine Bewegung (L) entlang einer Lücke neben dem genannten Zahnradzahn (2) mit einer Wälzbewegung (R, Q) synchronisiert ist, die von der Mehrachsmaschine (100) so ausgeführt wird, dass der sich ergebenden Arbeitshub (Z4) eine lineare oder gekrümmte Bewegung ist, wobei ein Arbeitshub und optional zusätzliche Arbeitshübe erforderlich sind, um eine Flanke der genannten Lücke komplett zu bearbeiten,
dadurch gekennzeichnet, dass die gegenseitigen Positionen der Zahnflanke und des Scheibenwerkzeugs (1) so verändert werden, dass sich bei jedem Schritt des Bearbeitens der Zahnflanke eine Eingriffslinie (3) auf der Bearbeitungsoberfläche (4) des Scheibenwerkzeugs (1) befindet, wobei die Eingriffslinie (3) der Linienkontakt zwischen der Bearbeitungsoberfläche (4) des Scheibenwerkzeugs (1) and einer zu bearbeitenden Zahnflanke des Zahnradzahnes (2) ist, wobei das Bearbeiten der Zahnflanke des Zahnradzahnes (2) mit dem Scheibenwerkzeug (1) beginnt, das mit Bezug zu der Zahnflanke so positioniert ist, dass die Eingriffslinie (3) nahe einer ersten Kante (7) der Zahnflanke ist und nacheinander die gegenseitigen Positionen des Scheibenwerkzeugs (1) und der Zahnflanke verändert werden, um zu bewirken, dass sich die Eingriffslinie (3) weiter von der ersten Kante (7) der Zahnflanke (2) weg bewegt, und das Bearbeiten der Zahnflanke beendet wird, wenn die Eingriffslinie (3) die gegenüber liegende Kante (8) der Zahnflanke erreicht.
 
2. Verfahren nach Anspruch 1, wobei das genannte Scheibenwerkzeug (1) mit seinem Umfang (5) nicht die Zahngrundfläche (6) bearbeitet.
 
3. Verfahren nach Anspruch 1, wobei das genannte Scheibenwerkzeug (1) mit seinem Umfang (5) die Zahngrundfläche (6) eines Zahnes (2) bearbeitet.
 
4. Verfahren nach Anspruch 1, wobei bei jedem Schritt des Bearbeitens der Zahnflanke (2) eine Eingriffslinie (3) verwendet wird.
 
5. Verfahren nach Anspruch 1, wobei das Wählen von aufeinanderfolgenden Eingriffslinien (3) beim Bearbeiten der Zahnflanke (2) verursacht, dass es sich bei den aufeinanderfolgenden, gewählten Eingriffslinien (3) um Erzeugende der Oberfläche der Zahnflanke (2) handelt.
 
6. Verfahren nach einem der vorausgehenden Ansprüche, wobei ein Scheibenschneidwerkzeug (1) als Scheibenwerkzeug genutzt wird, wobei das Scheibenschneidwerkzeug (1) mehrere Schneidelemente oder Messer (13) umfasst, die entlang des Umfangs (5) des Scheibenschneidwerkzeugs (1) angeordnet sind, wobei jedes Schneidelement oder Messer (13) mindestens eine Schneidkante (14) hat.
 
7. Verwendung des Verfahrens nach einem der vorausgehenden Ansprüche zum Herstellen eines Kegelrades mit nicht-geraden Zähnen (2).
 
8. Verwendung des Verfahrens nach Anspruch 1 für das Herstellen eines Stirnrades mit nicht-geraden Zähnen (2).
 


Revendications

1. Procédé de production de dents d'engrenage pour produire des dents d'engrenage non rectilignes, ledit procédé étant réalisé sur une machine multiaxes (100) à l'aide d'un outil disque (1), dans lequel ledit outil disque (1) se déplace le long d'une dent d'engrenage (2), son mouvement (L) le long d'un creux adjacent à ladite dent d'engrenage (2) étant synchronisé avec un mouvement de roulement (R, Q) exécuté par ladite machine multiaxes, de sorte que la course de travail obtenue (Z4) est un mouvement linéaire ou courbe, une course de travail et éventuellement des courses de travail supplémentaires étant nécessaires pour usiner complètement un flanc dudit creux,
caractérisé en ce que les positions mutuelles du flanc de dent et de l'outil disque (1) sont modifiées pour faire en sorte qu'à chaque étape de l'usinage du flanc de dent une ligne de pression (3) se trouve sur une surface d'usinage (4) dudit outil disque (1), la ligne de pression (3) étant la ligne de contact entre la surface d'usinage (4) de l'outil disque (1) et un flanc de dent de la dent d'engrenage (2) à produire, l'usinage du flanc de dent de la dent d'engrenage (2) débutant avec l'outil disque (1) positionné par rapport à la dent d'engrenage (2) de telle sorte que la ligne de pression (3) est proche d'un premier bord (7) du flanc de dent, et, en conséquence, les positions mutuelles de l'outil disque (1) et de la dent d'engrenage (2) étant ensuite modifiées pour faire en sorte que la ligne de pression (3) s'éloigne davantage du premier bord (7) du flanc de dent (2), et l'usinage du flanc de dent étant terminé lorsque la ligne de pression (3) atteint le bord opposé (8) du flanc de dent.
 
2. Procédé selon la revendication 1, dans lequel ledit outil disque (1) n'usine pas une surface d'appui inférieure (6) avec son périmètre (5).
 
3. Procédé selon la revendication 1, dans lequel ledit outil disque (1) usine une surface d'appui inférieure (6) de la dent (2) avec son périmètre (5).
 
4. Procédé selon la revendication 1, dans lequel on utilise une ligne de pression (3) à chaque étape de l'usinage du flanc de dent (2).
 
5. Procédé selon la revendication 1, dans lequel la sélection de lignes de pression consécutives (3) pour l'usinage du flanc de dent (2) fait que les lignes de pression consécutives sélectionnées (3) sont les créatrices de la surface du flanc de dent (2).
 
6. Procédé selon l'une des revendications précédentes, dans lequel une fraise (1) est utilisée comme outil disque, ladite fraise (1) comprenant plusieurs éléments de coupe ou lames (13) disposés le long du périmètre (5) de la fraise (1), chaque élément de coupe ou lame (13) ayant au moins un bord tranchant (14).
 
7. Utilisation du procédé selon l'une des revendications précédentes pour fabriquer un engrenage conique avec des dents non rectilignes (2).
 
8. Utilisation du procédé selon la revendication 1 pour fabriquer un engrenage à denture frontale avec des dents non rectilignes (2).
 




Drawing


























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