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(11) | EP 4 578 597 A2 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | ULTRASONIC CONDUCTION GRINDING MODULE |
| (57) An ultrasonic conduction grinding module, comprising a vibration source (1), which
comprises a plurality of piezoelectric plates (11), and a conductive sheet group (12)
having at least one first conductive sheet (121) and at least one second conductive
sheet (122), the conductive sheet group (12) being used to enable the piezoelectric
plates (11) to be in a parallel configuration, the piezoelectric plates (11) abutting
against an elastic body (14), and a coupling member (15) penetrating the elastic body
(14) and the piezoelectric plates (11); a steering member (2), an outer side thereof
being provided with a conical body; and an amplitude rod (3), an inner side thereof
being provided with an adapter ring (31) in a radial protruding manner, and an outer
side thereof extending axially and being connected to a shaft rod (32) of at least
one grinding wheel (4), wherein an inner side of the shaft rod (32) is axially provided
with a conical groove (321) that is complementary to the taper of the conical body;
and the shaft rod is further provided with a locking hole (322) axially formed therein
that is in communication with the conical channel (321) for locking the coupling member
(15). The ultrasonic conduction grinding module can make chippings from workpieces
fall down under the action of radial high-frequency vibration, and can also improve
the grinding efficiency while reducing the wear of grinding pieces.
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[TECHNICAL FIELD]
[0001] The invention relates to a grinding device, in particular, to an ultrasonic conduction grinding module.
[BACKGROUND]
[0002] A grinder is a processing machine for grinding a workpiece by a grinding wheel, such as an emery wheel, to obtain the shape, the size or the precision machining surface required by the workpiece. In the process of grinding a workpiece by an existing grinder, the generated workpiece chippings can be accumulated on the grinding wheel and need to be removed, for example, the grinding wheel is washed with water, which is equivalent to troubles and inconvenience; and meanwhile, the grinding efficiency cannot be improved, and the abrasion of the grinding piece is reduced.
[0003] In fact, the application of ultrasonic technology has been widely used in cutting machines, taking the ultrasonic spindle as an example. It mainly utilizes the high-frequency vibration of the ultrasonic vibration source to enable the tool installed on the spindle to generate high-frequency oscillation, effectively reducing cutting resistance and separating particles on the surface of the workpiece one by one. When the workpiece is a hard and brittle material, such as glass, ceramic, zirconium dioxide, etc. While the ultrasonic processing machine is applied, chippings generated by the machining can be made to be thinner, and meanwhile the service life of the tool can be prolonged.
[0004] Therefore, how to configure the ultrasonic vibration source in the grinding machine enables the grinding wheel to utilize the high-frequency vibration of the ultrasonic vibration source in the workpiece grinding process, so that the workpiece chippings produced in the grinding process can fall off through the radial vibration of the grinding wheel, and the problem to be overcome by a related industry person is solved.
[SUMMARY]
[0005] The main purpose of the invention is to provide an ultrasonic conduction grinding module, which can be directly built into a grinding machine or installed in a tool holder, so that workpiece chippings produced in the grinding process can fall off through radial high-frequency vibration formed by at least one grinding wheel under the action of the ultrasonic conduction grinding module, meanwhile, the grinding efficiency can be improved, and the abrasion of the grinding piece can be reduced.
[0006] The invention provides an ultrasonic conduction grinding module, which comprises:
a vibration source, including a plurality of piezoelectric plates, and a conductive sheet group with at least one first conductive sheet and at least one second conductive sheet, the conductive sheet group being configured to form a parallel connection state of the piezoelectric plates, and the piezoelectric plate being adjacent to an elastic body, and a coupling member passing through the elastic body and the piezoelectric plate;
a steering member, through which the coupling member passes, and outer side of which is provided with a conical body; and
an amplitude rod, the inner side of the amplitude rod is radially provided with an adapter ring, the outer side of the amplitude rod extends axially to receive a shaft rod of at least one grinding wheel, and the inner side of the shaft rod is axially provided with a conical groove with a taper complementary to the conical body; and the shaft rod is further axially provided with a locking hole communicated with the conical groove and is locked by the coupling member;
upon application of a regular frequency and a positive voltage, the piezoelectric plate is alternately elongated and restored and generates axial high-frequency vibrations, the axial high-frequency vibrations are transmitted to the conical body on the steering member in a complementary state, also transmitted to the conical groove on the amplitude rod, so as to form a radial high-frequency vibration.
[0007] In one embodiment, the steering member is made of metal, and the inner side of the steering member is adjacent to one of the second conductive sheets to form an electrical connection.
[0008] In one embodiment, the adapter ring is axially provided with a plurality of connecting holes, and once each connecting hole is penetrated by a connecting piece, it locked to a processing machine, a tool holder, or a flange of a grinding machine, to drive the ultrasonic conduction grinding module to rotate synchronously with the processing machine, tool holder or flange.
[0009] In one embodiment, the processing machine is a surface grinder, an outer diameter grinder or an inner hole grinder.
[0010] In one embodiment, the at least one grinding wheel comprises a first grinding wheel and a second grinding wheel; the first grinding wheel and the second grinding wheel are connected to the shaft rod, and the shaft rod is further provided with a spacer ring between the first grinding wheel and the second grinding wheel.
[0011] In order to achieve the aforementioned purpose, another technical solution provided by the present invention is:
The invention provides an ultrasonic conduction grinding module, which comprises:
a vibration source, including a plurality of piezoelectric plates, and a conductive sheet group with at least one first conductive sheet and at least one second conductive sheet, the conductive sheet group being configured to form a parallel connection state of the piezoelectric plates, and the piezoelectric plate being adjacent to an elastic body, and a coupling member passing through the elastic body and the piezoelectric plate;
an amplitude rod, the inner side of the amplitude rod is radially provided with an adapter ring, the outer side of the amplitude rod extends axially to receive a shaft rod of at least one grinding wheel, the outer side of the shaft rod is axially provided with a conical groove, and the opposite side of the shaft rod is provided with a rod groove communicated with the conical groove;
a relay rod, through which the coupling member passes and is sleeved in the rod groove; and
a steering member, having a conical body sleeved in the conical groove and having a taper complementary to the conical groove, the conical body is adjacent to the relay rod, and is axially provided with a screw hole for locking the coupling member;
upon application of a regular frequency and a positive voltage, the piezoelectric plate is alternately elongated and restored and generates axial high-frequency vibrations, the axial high-frequency vibrations are transmitted to the conical body on the steering member in a complementary state, also transmitted to the conical groove on the amplitude rod, so as to form a radial high-frequency vibration.
[0012] In one embodiment, the relay rod is made of metal, and the inner side of the relay rod is adjacent to one of the second conductive sheets to form an electrical connection.
[0013] In one embodiment, the adapter ring is axially provided with a plurality of connecting holes, and once each connecting hole is penetrated by a connecting piece, it locked to a processing machine, a tool holder, or a flange of a grinding machine, to drive the ultrasonic conduction grinding module to rotate synchronously with the processing machine, tool holder or flange.
[0014] In one embodiment, the processing machine is a surface grinder, an outer diameter grinder or an inner hole grinder.
[0015] In one embodiment, the at least one grinding wheel comprises a first grinding wheel and a second grinding wheel; the first grinding wheel and the second grinding wheel are connected to the shaft rod, and the shaft rod is further provided with a spacer ring between the first grinding wheel and the second grinding wheel.
[0016] The technical solution provided by the invention has the beneficial effects that, radial high-frequency vibration is formed when the axial high-frequency vibration is transmitted to the conical body on the steering member in the complementary state, and also transmitted to the conical groove on the amplitude rod, so that the workpiece chippings produced by the workpiece in the grinding process can fall off under the action of the radial high-frequency vibration, meanwhile, the grinding efficiency can be improved, and the abrasion of the grinding piece can be reduced.
[BRIEF DESCRIPTION OF THE DRAWINGS]
[0017] Specific technical content created by the present invention is further disclosed below in conjunction with the accompanying drawings, wherein:
Fig. 1 is a perspective exploded view of the first embodiment of an ultrasonic conduction grinding module provided by the invention;
Fig. 2 is a perspective exploded view of a vibration source provided by the invention;
Fig. 3 is a perspective view of the first embodiment of an ultrasonic conduction grinding module provided by the invention;
Fig. 4 is another perspective view of the first embodiment of an ultrasonic conduction grinding module provided by the invention;
Fig. 5 is a cross-sectional view of an ultrasonic conduction grinding module provided by the invention in the grinding process according to the first embodiment of the invention;
Fig. 6 is the schematic diagram of ultrasonic transmission in the grinding process shown in Fig.5;
Fig. 7 is a perspective exploded view of the second embodiment of an ultrasonic conduction grinding module according to the present invention; and
Fig. 8 is a cross-sectional view of the first embodiment of an ultrasonic conduction grinding module provided by the present invention in the grinding process.
SYMBOL DESCRIPTION:
[0018]
| Vibration source | 1 | Piezoelectric plate | 11 |
| Conductive sheet group | 12 | First conductive sheet | 121 |
| Second conductive sheet | 122 | Insulating inner ring | 13 |
| Elastic body | 14 | Coupling member | 15 |
| Steering member | 2 | Through hole | 21 |
| Conical body | 22 | Screw hole | 23 |
| Amplitude rod | 3 | Adapter ring | 31 |
| Connection hole | 311 | Shaft rod | 32 |
| Conical groove | 321 | Locking hole | 322 |
| Rod groove | 323 | ||
| Grinding wheel | 4 | First grinding wheel | 41 |
| First sleeve hole | 411 | Second grinding wheel | 42 |
| Second sleeve hole | 421 | Spacer ring | 43 |
| Relay rod | 5 | Through hole | 51 |
| Arrow | A | Axial high-frequency vibrations | B |
| Radial high-frequency vibrations | C |
[DETAILED DESCRIPTION]
[0019] As shown in FIG. 1 to FIG. 6, the first embodiment of the ultrasonic conduction grinding module provided by the present invention includes a vibration source 1, a steering member 2, an amplitude rod 3, and at least one grinding wheel 4.
[0020] As shown in FIG. 1 and FIG. 2, the vibration source 1 includes a plurality of piezoelectric plates 11 and a conductive sheet group 12 having at least one first conductive sheet 121 and at least one second conductive sheet 122. The conductive sheet group 12 is used for the piezoelectric plates 11 are formed in a parallel configuration. The piezoelectric plate 11 is provided for the insulating inner ring 13 to pass through, and an elastic body 14, such as a polymer elastic material (such as rubber or silicone, etc.) is adjacent to the rear; a coupling member 15 (e.g., a screw) is threaded through the elastic body 14, the insulating inner ring 13 and the steering member 2, and are connected to the amplitude rod 3, so that the vibration source 1 is axially connected to the amplitude rod 3..
[0021] In another embodiment, when the coupling member 15 is made of insulating material, the arrangement of the insulating inner ring 13 can be omitted.
[0022] The steering member 2 is axially provided with a through hole 21 for the coupling member 15 to pass through. The steering member 2 is made of metal, such as copper or copper alloy. One side of the steering member 2, for example, one of the inner sides adjacent to the second conductive plate 122, is electrically connected, and the other side, such as the outer side, is provided with a conical body 22.
[0023] The amplitude rod 3 is a T-shaped seat body, an adapter ring 31 is arranged on one side of the amplitude rod 3 in a radial protruding mode, for example, an adapter ring 31 is radially arranged on the inner side in a protruding mode, a plurality of connecting holes 311 are formed in the adapter ring 31 in the axial direction, and each connection hole 311 for a connection member (not shown) to be threaded and locked to a known processing machine, such as a spindle, a tool holder, or a flange of a grinding machine, etc., so that the ultrasonic conduction grinding module can synchronously rotate along with the spindle, the tool holder or the flange. The processing machine is selected from a surface grinder, an outside diameter grinder, or an internal bore grinder, and the like. Moreover, the other side of the amplitude rod 3, such as the outer side, is axially extended with a shaft rod 32 for at least one grinding wheel 4, and the inner side of the shaft rod 32 is axially provided with a conical groove 321 complementary to the conical body 22; and the shaft rod 32 is also axially provided with a locking hole 322 connected to the conical groove 321 for locking the coupling member 15 (see Figure 5).
[0024] Please refer to FIG. 1 again, the grinding wheel 4 includes a first grinding wheel 41 and a second grinding wheel 42. The first grinding wheel 41 has a fitting, such as a first sleeve hole 411 that fits snugly into the shaft rod 32, while the second grinding wheel 42 also has a fitting, such as a second sleeve hole 421 that fits snugly into the shaft rod 32. To separate the first grinding wheel 41 from the second grinding wheel 42, the shaft rod 32 is further fitted between the first grinding wheel 41 and the second grinding wheel 42, for example with a spacer ring 43.
[0025] The first grinding wheel 41 and the second grinding wheel 42 can select grinding wheels with different meshes according to the grinding requirements. Therefore, when a workpiece, such as a milling cutter, can be initially ground on the first grinding wheel 41 and then finely ground by the second grinding wheel 42. By the implementation of the present invention, the grinding operation can be carried out separately by choosing different grinding wheels, such as the first grinding wheel 41 and the second grinding wheel 42, so as to avoid the inconvenience of changing grinding wheels.
[0026] According to the aforementioned explanation of the relationship between the components and the connection, the three-dimensional state of the first embodiment of the ultrasonic conduction grinding module provided by the invention after assembly is shown in Figures 3 and 4, and after the connecting holes 311 of the adapter ring 31 of the ultrasonic conduction grinding module penetrate through the connecting piece, the connecting holes 311 are locked on the spindle, the tool holder or the flange, so that the ultrasonic conduction grinding module can synchronously rotate along with the spindle, the tool holder or the flange.
[0027] Please refer to FIG. 5 and FIG. 6, when the ultrasonic conduction grinding module in operation, one end (positive pole) of the voltage source of the spindle or the tool holder is connected to at least one first conductive sheet 121; and the other end (negative pole) of the voltage source is connected to at least one piece of the second conductive sheet 122. When a positive voltage is applied to the surface of the piezoelectric plate 11, the electric dipole moment will be elongated due to the action of the electric field, so that the piezoelectric plate 11 will be elongated along the direction of the electric field in order to resist the change (as shown by the arrow A in Figure 5). Therefore, when a regular frequency and positive voltage are applied, the piezoelectric plate 11 is stretched and recovered to produce axial high-frequency vibration B (shown in the axial plural arcs in Figure 5). When the axial high-frequency vibration B is transmitted to the conical body 22 on the steering member 2 and the conical groove 321 on the amplitude rod 3 in a complementary form, that is, the formation of radial high-frequency vibration C (shown in Figure 5 and Figure 6 in the radial plural arcs), so that the workpiece chippings produced in the grinding process can be dropped under the action of the radial high-frequency vibration C.
[0028] As shown in FIG. 7 and FIG. 8, the three-dimensional exploded view and the assembled cross-sectional view of the second embodiment of the ultrasonic conduction grinding module provided by the invention are respectively displayed, and compared with the first embodiment, the second embodiment use the same reference numerals (symbols) to indicate the same components, since the second embodiment shares many common components with the first embodiment, only the differences between the two will be described in detail.
[0029] In this embodiment, the amplitude rod 3 is also a T-shaped body with one side, e.g., the inner side, radially protruding from the adapter ring 31, and the adapter ring 31 is axially provided with a plurality of connecting holes 311, the other side of the amplitude rod 3, e.g., the outer side, axially extends to the shaft rod 32 with at least one grinding wheel 4. A conical groove 321 is axially formed on the outer side of the shaft rod 32, and a rod groove 323 communicated with the conical groove 321 is formed on the other side, that is, the inner side.
[0030] In addition, the relay rod 5 is sleeved in the rod groove 323, and the relay rod 5 is axially provided with a through hole 51 through which the coupling member 15 passes. The relay rod 5 is made of metal, such as copper or copper alloy, and one side of the relay rod 5, such as the inner side, is adjacent to one of the second conductive sheets 122 to form an electrical connection.
[0031] The steering member 2 is provided with a conical body 22 which is arranged in the conical groove 321 in a sleeving mode and is complementary to the conical groove 321 in a taper mode, and the conical body 22 is adjacent to the relay rod 5 and axially provided with a screw hole 23 for locking the coupling member 15.
[0032] According to the aforementioned explanation of the relationship between the components and the connection, the second embodiment of the ultrasonic conduction grinding module provided by the invention is shown in Fig. 8, and after the connecting holes 311 of the connecting ring 31 of the ultrasonic conduction grinding module penetrate through the connecting piece, the connecting holes 311 are locked on the spindle, tool holder or flange, so that the ultrasonic conduction grinding module can synchronously rotate along with the spindle, tool holder or flange.
[0033] Referring again to FIG. 8, while the ultrasonic conductive grinding module in operation, one end (positive electrode) of a voltage source of a spindle or tool holder is connected to at least one first conductive sheet 121; and the other end (negative electrode) of the voltage source is connected to at least one second conductive sheet 122. When the negative voltage is applied to the surface of the piezoelectric plate 11, the electric dipole moment will be squeezed due to the electric field, so that the piezoelectric plate 11 will be squeezed in the direction of the electric field to resist the change. Therefore, when a regular frequency and negative voltage are applied, the piezoelectric plate 11 is squeezed and recovered to produce axial high-frequency vibration B (shown in the axial plural arcs in Figure 8). When the axial high-frequency vibration B is transmitted to the conical body 22 on the steering member 2 and the conical groove 321 on the amplitude rod 3 in a complementary shape, it forms the radial high-frequency vibration C (shown in the radial plural arcs in Fig. 8), so that the workpiece chippings produced in the grinding process can fall off under the action of the radial high-frequency vibration C.
[0034] Therefore, the effect of the invention is that the radial high-frequency vibration formed by transmitting of the axial high-frequency vibration to the conical body on the steering member and the conical groove on the amplitude rod in a complementary shape, enables the workpiece chippings produced during the grinding process to fall off under the action of the radial high-frequency vibration, and at the same time achieves the advantages of improving the grinding efficiency and reducing the wear of the grinding sheet. Furthermore, the ultrasonic conductive grinding module can be locked to the spindle or tool holder, so that the ultrasonic conductive grinding module can rotate synchronously with the spindle or tool holder. In particular, the amplitude rod of the ultrasonic conduction grinding module can be connected to at least one grinding wheel, such as the first grinding wheel and the second grinding wheel to carry out grinding work separately, so as to avoid the inconvenience of replacing grinding wheels, which is an unprecedented design of its kind.
[0035] The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is more specific and detailed, but it should not be construed as a limitation on the patent scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.
a vibration source, including a plurality of piezoelectric plates, and a conductive sheet group with at least one first conductive sheet and at least one second conductive sheet, the conductive sheet group being configured to form a parallel connection state of the piezoelectric plates, and the piezoelectric plate being adjacent to an elastic body, and a coupling member passing through the elastic body and the piezoelectric plate;
an amplitude rod, the inner side of the amplitude rod is radially provided with an adapter ring, the outer side of the amplitude rod extends axially to receive a shaft rod of at least one grinding wheel, the outer side of the shaft rod is axially provided with a conical groove, and the opposite side of the shaft rod is provided with a rod groove communicated with the conical groove;
a relay rod, through which the coupling member passes and is sleeved in the rod groove; and
a steering member, having a conical body sleeved in the conical groove and
having a taper complementary to the conical groove, the conical body is adjacent to the relay rod, and is axially provided with a screw hole for locking the coupling member;
upon application of a regular frequency and a positive voltage, the piezoelectric plate is alternately elongated and restored and generates axial high-frequency vibrations, the axial high-frequency vibrations are transmitted to the conical body on the steering member in a complementary state, also transmitted to the conical groove on the amplitude rod, so as to form a radial high-frequency vibration.