Electrically conductive block clamp for wire sawing

Abstract

This application relates to a conductive block clamp for wire EDM, comprising a conductive block, an insulating mounting base, and a conductive chuck. The insulating mounting base has a first mounting hole, and the conductive chuck is disposed within the first mounting hole with a clearance fit. The conductive chuck has a second mounting hole along its axial direction, into which the conductive block can be slidably inserted. A conductive block adjustment assembly is provided on one side of the insulating mounting base. This assembly drives the conductive block to slide axially along the second mounting hole, adjusting the length of the conductive block extending beyond the second mounting hole. During movement, the molybdenum wire is deviated from the wear area on the conductive block surface to prevent poor conductivity or wire breakage. This also increases the usable area of ​​the conductive block, reduces the replacement frequency, and improves its utilization efficiency. During use, the conductive block and the conductive chuck maintain full contact, ensuring stable contact between the molybdenum wire and the conductive block, resulting in good discharge performance during the cutting process.

Description

Technical Field

[0001] This application belongs to the field of machining technology, and specifically relates to a conductive block clamp for wire EDM. Background Technology

[0002] Wire EDM is a technique that uses an energized metal wire (usually molybdenum or copper wire) to perform deep cutting on conductive metal. The machine tool is equipped with guide wheels for directional movement of the wire and conductive blocks for connecting and energizing the wire. This allows the energized wire to generate high temperatures through pulsed discharge in an insulating medium along a predetermined path, cutting the material through electro-erosion. The conductive block is fixed to the machine tool by a fixture. At least one side of the conductive block is arc-shaped and in contact with the wire for conductivity. Prolonged sliding friction between the wire and the conductive block can easily cause wear, scratches, or grooves on the surface of the conductive block. Timely replacement of the conductive block or treatment of the contact area between the wire and the conductive block is necessary to prevent poor conductivity or wire breakage. However, in existing technologies, the process of assembling and disassembling the conductive block from the fixture is cumbersome, and frequent replacements result in low utilization of the conductive block, increasing maintenance and processing costs. Summary of the Invention

[0003] Based on the aforementioned technical needs, this application provides a conductive block fixture for wire EDM, which can solve the problems in the prior art where the process of disassembling or replacing conductive blocks is cumbersome, and frequent replacements lead to low utilization of conductive blocks and high maintenance costs.

[0004] To achieve the above objectives, the technical solution of this application is as follows:

[0005] A conductive block clamp for wire cutting includes a conductive block, an insulating mounting base, and a conductive chuck. The insulating mounting base has a first mounting hole, and the conductive chuck is disposed in the first mounting hole with a clearance fit. The conductive chuck has a second mounting hole along the axial direction, and the conductive block is slidably inserted into the second mounting hole. A conductive block adjusting assembly is provided on one side of the insulating mounting base, and the conductive block adjusting assembly is used to drive the conductive block to slide along the axial direction of the second mounting hole.

[0006] Preferably, the conductive block adjustment assembly includes a bracket and a servo linear motor. The servo linear motor is mounted on one side of the insulating mounting base via the bracket, and the output shaft of the servo linear motor extends axially along the second mounting hole and contacts one end of the conductive block.

[0007] Preferably, the conductive block adjustment assembly further includes a detection sensor and a sensor bracket. The sensor bracket is disposed on one side of the insulating mounting base. The detection sensor is detachably disposed on the sensor bracket and electrically connected to the servo linear motor. The detection sensor is used to detect the length of the conductive block extending out of the mounting hole.

[0008] Preferably, the sensor bracket includes a fixed rod and a sleeve. One end of the fixed rod is fixedly connected to the insulating mounting base, and the other end is hinged to the sleeve. The detection sensor is connected to the inner cavity of the sleeve. The sleeve is used to rotate around the hinge to adjust the detection angle of the detection sensor.

[0009] Preferably, the output shaft of the servo linear motor is detachably connected to one end of the conductive block.

[0010] Preferably, the surface of the insulating mounting base is provided with at least one first set screw hole, the first set screw hole is connected to the first mounting hole, and a first adjusting bolt is provided in the internal thread of the first set screw hole.

[0011] Preferably, the surface of the conductive clamp is provided with at least one second set screw hole, the second set screw hole is connected to the second mounting hole, and a second adjusting bolt is provided in the internal thread of the second set screw hole.

[0012] Preferably, one end of the conductive clamp is provided with a conductive post, and one end of the conductive post extends beyond the first mounting hole.

[0013] By adopting the above technical solution, compared with the prior art, this application has at least the following beneficial effects:

[0014] When using the conductive block clamp for wire cutting, several insulating mounting seats are fixed at intervals on the wire cutting machine frame along the molybdenum wire guide. After connecting the conductive chuck to the high-frequency pulse power supply, the length of the conductive block extending out of the second mounting hole is adjusted by the conductive block adjustment assembly. During the movement, the molybdenum wire is deviated from the worn parts of the conductive block surface to prevent problems such as poor conductivity or wire breakage. When there are many scratches on one side of the conductive block, the conductive block is completely pushed out and the opposite surface is used as the working surface to contact the molybdenum wire before being reinserted into the second mounting hole. This increases the utilization area of ​​the conductive block, reduces the replacement frequency of the conductive block, and improves the utilization efficiency of the conductive block. During use, the conductive block and the conductive chuck are in full contact, which can improve the contact stability between the molybdenum wire and the conductive block, allowing the molybdenum wire to exhibit a good discharge effect during the cutting process. Attached Figure Description

[0015] Figure 1 This is a partial schematic diagram of a wire cutting conductive fixture in an embodiment.

[0016] Figure 2 This is a first-view disassembly diagram of a wire cutting conductive fixture in the embodiment.

[0017] Figure 3 This is a second-view disassembly diagram of a wire EDM conductive fixture.

[0018] In the figure: 1. Conductive block; 2. Insulating mounting base; 3. Conductive clamp; 4. First mounting hole; 5. Second mounting hole; 6. Bracket; 7. Servo linear motor; 8. Detection sensor; 9. Fixing rod; 10. Sleeve; 11. Coupling; 12. First set screw hole; 13. First adjusting bolt; 14. Second set screw hole; 15. Second adjusting bolt; 16. Conductive post. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of this application will be further described below with reference to the accompanying drawings of the embodiments, and this application is not limited to the following specific implementation methods.

[0020] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "inner," "outer," "left," "right," "front," "rear," "top," and "bottom" indicate directions or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limitations on this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0021] The following is in conjunction with the appendix Figure 1 To be continued Figure 3 The present application will be further described in detail with reference to specific embodiments.

[0022] This application discloses a conductive block 1 clamp for wire cutting, including a conductive block 1, an insulating mounting base 2, and a conductive chuck 3. A first mounting hole 4 is provided through the insulating mounting base 2 between opposite sides. The inner wall of the first mounting hole 4 forms a receiving cavity that fits with the side of the conductive chuck 3. The conductive chuck 3 is inserted into the first mounting hole 4 through a clearance fit with the receiving cavity. A second mounting hole 5 is provided through the conductive chuck 3 along its axial direction, and the conductive block 1 is slidably inserted into the second mounting hole 5. The opposite two surfaces of the conductive chuck 3 are divided into working surfaces and non-working surfaces. The working surface is the surface that facilitates contact between the conductive block 1 and the energized metal wire. An adjusting component for the conductive block 1 is provided on the side of the insulating mounting base 2 adjacent to the non-working surface of the conductive chuck 3. This adjusting component is used to drive the conductive block 1 to slide axially along the second mounting hole 5, so that the conductive block 1 extends a certain length beyond the working surface as required for wire cutting conductivity.

[0023] Specifically, compared to existing conductive blocks (which are mostly 12×12×12 mm in size, with a small usable area and short length, and are directly fixed to the wire cutting machine frame with bolts, requiring frequent replacements, leading to waste and cumbersome replacement), the conductive block 1 adopts a long strip structure, extending its original length to facilitate adjustment of the extension length and replacement of the contact surface with the energized metal wire. Preferably, the conductive block 1 has dimensions of 9.8×4.8×40 mm. To ensure sufficient contact between the conductive block 1 and the metal wire and reduce wear on the conductive block 1 from the metal wire, the side of the conductive block 1 is arc-shaped along the overlapping direction of the metal wire, and the shape of the second mounting hole 5 matches the side of the conductive block 1 to increase the contact area between the conductive clamp 3 and the conductive block 1, thereby ensuring higher conductivity. Both the conductive clamp 3 and the conductive block 1 are made of metals with excellent conductivity, such as tungsten steel or copper; the insulating mounting base 2 is made of insulators such as plastic.

[0024] The process and beneficial effects of using the above-mentioned wire EDM conductive block 1 fixture are as follows:

[0025] When using the above-mentioned wire EDM conductive block 1 clamp, several insulating mounting seats 2 are fixed at intervals on the wire EDM frame along the molybdenum wire guide. After connecting the conductive chuck 3 to the high-frequency pulse power supply, the length of the conductive block 1 extending out of the second mounting hole 5 is adjusted by the conductive block 1 adjustment assembly. During the movement, the molybdenum wire is deviated from the worn parts on the surface of the conductive block 1 to prevent problems such as poor conductivity or wire breakage of the molybdenum wire. When there are many scratches on one side of the conductive block 1, the conductive block 1 is completely pushed out and the opposite surface is used as the working surface to contact the molybdenum wire and reinserted into the second mounting hole 5. This can increase the utilization area of ​​the conductive block 1, reduce the replacement frequency of the conductive block 1, and improve the utilization efficiency of the conductive block 1. During use, the conductive block 1 and the conductive chuck 3 are in full contact, which can improve the contact stability between the molybdenum wire and the conductive block 1, so that the molybdenum wire exhibits a good discharge effect during the cutting process.

[0026] In one embodiment, to facilitate the adjustment of the extension length of the conductive block 1, the conductive block 1 adjustment assembly includes a bracket 6 and a servo linear motor 7. The bracket 6 is disposed on the side of the insulating mounting base 2 adjacent to the non-working surface of the conductive clamp 3. The fixed end of the servo linear motor 7 is fixed on the bracket 6, and the output shaft of the servo linear motor 7 extends axially along the second mounting hole 5 and contacts one end of the conductive block 1.

[0027] Specifically, the output shaft of the servo linear motor 7 is made of insulating material or the output shaft is separated from the conductive block 1 by insulating material to prevent leakage of the conductive block 1; the servo linear motor 7 can set the length of the conductive block 1 to be pushed out based on the PLC controller to ensure pushing accuracy.

[0028] Furthermore, the aforementioned conductive block 1 adjustment assembly also includes a detection sensor 8 and a sensor bracket 6. The sensor bracket 6 is detachably mounted on the top or bottom of the insulating mounting base 2, and the detection sensor 8 is detachably mounted on the sensor bracket 6 and electrically connected to the aforementioned servo linear motor 7 to form a closed-loop control circuit. Specifically, the detection sensor 8 is preferably a proximity sensor of a grating ruler / magnetic grating ruler probe. Its detection end, adjusted via the sensor bracket 6, can detect and provide feedback on the extension length of the conductive block 1, and feeds back the length of the conductive block 1 extending beyond the mounting hole as an electrical signal to the servo linear motor 7, causing the servo linear motor 7 to push or stop pushing the conductive block 1 based on this signal. Specifically, a PLC controller can be electrically connected to the control circuit. Based on the controller, multiple extension lengths of the conductive blocks 1 can be preset as needed. The servo linear motor 7 pushes the conductive block 1 out of the second mounting hole 5 according to the preset extension length. When the detection sensor 8 detects that the conductive block 1 has reached the preset length, the feedback signal causes the servo linear motor 7 to stop pushing. When the conductive block 1 needs to be replaced with a different contact position with the molybdenum wire after a period of use, the servo linear motor 7 drives the conductive block 1 to extend to another preset length.

[0029] Specifically, when the operator observes obvious grooves or wear marks on the protruding part of the conductive block 1, the servo linear motor 7 is activated to extend the conductive block 1 by 10 mm or 20 mm, thus offsetting the scratches on the conductive block 1 from the movement trajectory of the energized metal wire; when the detection sensor 8 detects that the extension length of the conductive block 1 reaches a preset value, such as 10 mm or 20 mm, a signal is fed back to the servo linear motor 7 to stop the operation.

[0030] In one specific embodiment, to facilitate adjustment of the distance and detection angle between the detection sensor 8 and the conductive block 1, the sensor bracket 6 includes a fixed rod 9 and a sleeve 10. One end of the fixed rod 9 is fixedly connected to the insulating mounting base 2, and the other end is provided with a hinge seat that is hinged to the hinge arm provided on the outside of the sleeve 10 or connected to the sleeve 10 through a universal joint. The detection sensor 8 is adjustablely connected to the inner cavity of the sleeve 10, and the sleeve 10 can rotate around the hinge part to adjust the detection angle of the detection sensor 8. The inner cavity of the sleeve 10 and the detection sensor 8 are slidably connected. Moving the detection sensor 8 along the axial direction of the sleeve 10 can adjust the distance between the detection sensor 8 and the conductive block 1, so as to adjust the detection sensor 8 to the optimal detection position and achieve high detection accuracy within the extension range of the conductive block 1.

[0031] In another embodiment, to ensure the accuracy of the servo linear motor 7 pushing the conductive block 1 and to avoid gaps between the output shaft of the servo linear motor 7 and the conductive block 1, the conductive block 1 is detachably connected to the output shaft of the servo linear motor 7 to ensure transmission efficiency and accuracy. Meanwhile, to facilitate the replacement and disassembly of the conductive block 1, preferably, in one embodiment, threaded holes are machined at both ends of the conductive block 1, and the output shaft of the servo linear motor 7 is rotatably connected to a lead screw via a coupling 11. By screwing the lead screw into the threaded hole, the output shaft is connected to the conductive block 1 to transmit thrust to the conductive block 1; replacing the conductive block 1 involves unscrewing the lead screw out of the threaded hole to disconnect the connection between the conductive block 1 and the output shaft.

[0032] As the conductive block 1 is used and worn, a gap may appear between the conductive block 1 and the second mounting hole 5, causing the conductive block 1 to become misaligned with the second mounting hole 5. This phenomenon may cause the output shaft of the servo linear motor 7 to fail to apply thrust to the axis of the conductive block 1, resulting in the conductive block 1 tilting or deviating from the horizontal plane, thus causing poor contact with the molybdenum wire. Furthermore, in any of the above embodiments, in order to ensure that the output shaft of the servo linear motor 7 can accurately extend into the second mounting hole 5 and contact the axis of the conductive block 1, the surface of the insulating mounting base 2 is provided with at least one first set screw hole 12, which communicates with the first mounting hole 4, and a first adjusting bolt 13 is provided with an internal thread engagement in the first set screw hole 12.

[0033] Specifically, several first set screw holes 12 can be provided axially around the first mounting hole 4. The position of the conductive chuck 3 in the first mounting hole 4 can be finely adjusted by turning the first adjusting bolt 13, so that the output shaft of the servo linear motor 7 is aligned with the axis of the conductive block 1 as much as possible during the adjustment process. After adjusting the position of the conductive chuck 3, tighten each first adjusting bolt 13 to fix the conductive chuck 3 to the insulating mounting base 2 and improve stability.

[0034] Furthermore, to prevent the conductive block 1, which has been worn down after use, from deviating from the horizontal plane during sliding due to the gap between it and the second mounting hole 5, the surface of the conductive chuck 3 is provided with at least one second set screw hole 14, which communicates with the second mounting hole 5, and a second adjusting bolt 15 is provided in the internal thread of the second set screw hole 14.

[0035] Specifically, at least one second set screw hole 14 is provided at the bottom of the conductive chuck 3 so that the second adjusting bolt can be adjusted vertically. By screwing the second adjusting bolt 15, the conductive block 1 is supported to a position where it can slide along the horizontal plane, and more sides of the conductive block 1 can be in contact with the conductive chuck 3 to ensure that the conductivity between the conductive block 1, the molybdenum wire, and the conductive chuck 3 can meet the requirements of wire cutting operations. At the same time, in order to ensure the smoothness of the sliding process of the conductive block 1, the end of the second adjusting bolt 15 that contacts the conductive block 1 needs to be polished smooth or have a lubricating coating, such as polytetrafluoroethylene, a material with good self-lubricating and wear-resistant properties. In order to facilitate safe and labor-saving screwing of the first adjusting bolt 13 and the second adjusting bolt 15, the first adjusting bolt 13 and the second adjusting bolt 15 can be wing bolts, and the wing handle used for screwing or the end of the wing bolt used for adjustment is made of insulating material.

[0036] In any of the above embodiments, to ensure the stability of the connection between the conductive clamp 3 and the high-frequency pulse power supply, a conductive post 16 is provided at one end of the conductive clamp 3, and one end of the conductive post 16 extends beyond the first mounting hole 4. The surface of the conductive post 16 may be threaded to allow it to be connected to the power supply's transmission wire with a nut.

[0037] By combining the various structures and features in the above embodiments, the corresponding functions of the above-mentioned wire EDM conductive block 1 fixture are improved, which can improve the convenience of using conductive block 1 and molybdenum wire for wire EDM operations, and improve the utilization rate of conductive block 1 and the efficiency of wire EDM operations, thereby reducing the cost of wire EDM operations.

[0038] Obviously, the above embodiments of this application are merely examples for clearly illustrating this application, and are not intended to limit the implementation of this application. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A conductive block clamp for wire cutting, characterized in that, include: The device comprises a conductive block, an insulating mounting base, and a conductive chuck. The insulating mounting base has a first mounting hole, and the conductive chuck is disposed in the first mounting hole with a clearance fit. The conductive chuck has a second mounting hole along the axial direction, and the conductive block is slidably inserted into the second mounting hole. A conductive block adjustment assembly is provided on one side of the insulating mounting base, and the conductive block adjustment assembly is used to drive the conductive block to slide along the axial direction of the second mounting hole.

2. The conductive block fixture for wire cutting as described in claim 1, characterized in that, The conductive block adjustment assembly includes a bracket and a servo linear motor. The servo linear motor is mounted on one side of the insulating mounting base via the bracket. The output shaft of the servo linear motor extends axially along the second mounting hole and contacts one end of the conductive block.

3. The conductive block fixture for wire cutting as described in claim 2, characterized in that, The conductive block adjustment assembly also includes a detection sensor and a sensor bracket. The sensor bracket is disposed on one side of the insulating mounting base. The detection sensor is detachably disposed on the sensor bracket and electrically connected to the servo linear motor. The detection sensor is used to detect the length of the conductive block extending out of the mounting hole.

4. The conductive block fixture for wire cutting as described in claim 3, characterized in that, The sensor bracket includes a fixed rod and a sleeve. One end of the fixed rod is fixedly connected to the insulating mounting base, and the other end is hinged to the sleeve. The detection sensor is connected to the inner cavity of the sleeve. The sleeve is used to rotate around the hinge to adjust the detection angle of the detection sensor.

5. The conductive block fixture for wire cutting as described in claim 2, characterized in that, The output shaft of the servo linear motor is detachably connected to one end of the conductive block.

6. The conductive block fixture for wire cutting as described in claim 1, characterized in that, The surface of the insulating mounting base is provided with at least one first set screw hole, which communicates with the first mounting hole, and a first adjusting bolt is provided in the internal thread of the first set screw hole.

7. The conductive block fixture for wire cutting as described in claim 1, characterized in that, The surface of the conductive clamp is provided with at least one second set screw hole, which communicates with the second mounting hole, and a second adjusting bolt is provided in the internal thread of the second set screw hole.

8. The conductive block fixture for wire cutting as described in claim 1, characterized in that, One end of the conductive clamp is provided with a conductive post, and one end of the conductive post extends beyond the first mounting hole.

Images