Wire saw multi-piece machining fixture
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- PARAGON MEDICAL DEVICE (CHANGZHOU) CO LTD
- Filing Date
- 2025-09-22
- Publication Date
- 2026-08-07
AI Technical Summary
[0003]为了解决现有的通用夹具匹配度差，加工时易损坏的问题，本实用新型提供了一种线切割多件加工夹具，通过工装主体和两侧的锁紧块对多个零件进行初步定位，然后再利用锁紧块内的弹性件和工装主体内的定位螺丝从零件的轴端和侧面对其进行完全定位，确保零件在加工过程中保持稳定
[0012]The beneficial effects of this utility model are as follows: This utility model provides a multi-part wire EDM machining fixture. Through the cooperation between the locking block and the fixture body, multiple parts can be processed simultaneously even when the part clamping and positioning surface is relatively small. It allows for rapid clamping and locking of parts, significantly reducing clamping time and improving production efficiency. The inclusion of elastic elements corresponding to each part not only enhances the uniformity of clamping force but also automatically adjusts according to slight differences in part dimensions, preventing damage to the parts. The cooperation between the elastic element at the part's shaft end and the positioning screw on the side of the part applies force to the part from two directions, ensuring the stability of the parts during processing, effectively reducing burn damage to parts, preventing scrap, and thus increasing production capacity.
Smart Images
Figure CN224600703U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device processing technology, and in particular to a wire EDM multi-piece processing fixture. Background Technology
[0002] In clinical intramedullary nail fracture treatment surgery, various precision metal parts are required. These parts typically need to be machined using wire cutting to achieve the required accuracy and dimensions for the surgery. However, a prominent problem exists in actual machining: there is currently a lack of specialized jigs designed specifically for these medical parts. When operators clamp the intramedullary nail parts to be machined onto existing general-purpose jigs, insufficient fit between the jig and the part often results in the part not being securely fixed. This unstable clamping can lead to abnormal vibrations and displacements during wire cutting, affecting not only machining accuracy but, more seriously, easily generating localized high temperatures at the cutting site, causing surface burns and quality defects that may affect subsequent clinical outcomes and patient safety. Utility Model Content
[0003] To address the issues of poor matching and easy damage during machining of existing general-purpose fixtures, this invention provides a multi-part machining fixture for wire EDM. The fixture body and locking blocks on both sides are used to initially position multiple parts. Then, the elastic elements in the locking blocks and the positioning screws in the fixture body are used to fully position the parts from the shaft end and side, ensuring that the parts remain stable during machining.
[0004] This utility model provides a multi-part wire EDM machining fixture, including a base, a fixture body, and locking blocks. The fixture body is mounted on the base and has a through machining hole along its length. The fixture body also has a workpiece placement hole communicating with the machining hole for placing parts. Locking blocks are located on both sides of the fixture body, and the locking blocks are rotatably connected to the base, allowing parts placed in the workpiece placement hole to extend into the machining hole. The locking blocks confine the parts within the workpiece placement hole and allow the end of the part to be machined to extend into the machining hole, facilitating the entry of the wire EDM wire for electrical discharge machining.
[0005] Furthermore, a mounting groove is provided in the middle of the base, and the main body of the tooling is fixedly installed in the mounting groove. Locking blocks are symmetrically arranged on both sides of the main body of the tooling via pins, and the locking blocks on both sides are fixedly connected by long screws. After the part is placed, the locking blocks on both sides of the main body of the tooling are flipped over to fit against it and fixed with long screws to restrict the main body of the tooling between the two locking blocks.
[0006] Furthermore, the two sides of the fixture body opposite the locking block are locking surfaces, and workpiece placement holes are correspondingly set on the two locking surfaces, arranged in a linear array along the length of the fixture body. The number of workpiece placement holes is set according to actual processing requirements, enabling the simultaneous accommodation of multiple parts and improving processing efficiency.
[0007] Furthermore, the locking block is equipped with an elastic element corresponding to the workpiece placement hole, which is used to push the part placed in the workpiece placement hole into the machining hole. The locking block is provided with an elastic groove to accommodate the elastic element. When the locking block flips and closes, the elastic force of the elastic element can push the part out of the workpiece placement hole, so that its end extends into the machining hole, thereby facilitating subsequent machining operations.
[0008] Furthermore, the elastic component includes a movable pin, a spring, and a screw rod. The screw rod confines the spring and movable pin within an elastic groove. An elastic hole communicating with the elastic groove is provided on the side of the locking block near the main body of the tooling. The movable pin is movably positioned within the elastic hole via the spring, and abuts against the end of the part. The spring constant is selected according to the machining requirements to ensure sufficient thrust for the part to extend into the machining hole when the locking block is closed, while avoiding damage to the part due to excessive spring force.
[0009] Furthermore, a flange is provided at the end of the part, the diameter of which is larger than the diameter of the workpiece placement hole. The flange abuts against the locking surface of the fixture body under the pushing action of the movable pin. The flange ensures that the movable pin pushes the part into place, preventing it from falling out of the machining hole.
[0010] Furthermore, a clearance groove is provided between the tooling body and the locking block to accommodate the movable pin and the flange of the parts. The clearance groove provides space for the movement of the movable pin and parts during the closing process of the locking block.
[0011] Furthermore, the main body of the tooling is also equipped with a positioning hole that communicates with the workpiece placement hole. A positioning screw is installed in the positioning hole, and the positioning screw abuts vertically against the side of the part placed in the workpiece placement hole. The addition of MISUMI screw positioning in the lateral direction, which cooperates with the elastic element at the shaft end, applies force to the part from two directions at the same time, ensuring stability during the machining process.
[0012] The beneficial effects of this utility model are as follows: This utility model provides a multi-part wire EDM machining fixture. Through the cooperation between the locking block and the fixture body, multiple parts can be processed simultaneously even when the part clamping and positioning surface is relatively small. It allows for rapid clamping and locking of parts, significantly reducing clamping time and improving production efficiency. The inclusion of elastic elements corresponding to each part not only enhances the uniformity of clamping force but also automatically adjusts according to slight differences in part dimensions, preventing damage to the parts. The cooperation between the elastic element at the part's shaft end and the positioning screw on the side of the part applies force to the part from two directions, ensuring the stability of the parts during processing, effectively reducing burn damage to parts, preventing scrap, and thus increasing production capacity. Attached Figure Description
[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the locking block of the machining fixture in its closed state; Figure 2 This is a schematic diagram showing the locking block on one side of the machining fixture in the open state; Figure 3 It is a sectional view of plane AA; Figure 4 This is a sectional view of the BB side; Figure 5 This is a first-angle disassembly diagram of the machining fixture; Figure 6 This is a second-angle disassembly diagram of the machining fixture; In the diagram: 1. Base, 11. Mounting slot, 2. Tooling body, 21. Machining hole, 22. Workpiece placement hole, 23. Locking surface, 24. Positioning hole, 3. Locking block, 31. Elastic groove, 32. Elastic hole, 33. Clearance groove, 4. Pin, 5. Long screw, 6. Elastic element, 61. Movable pin, 62. Spring, 63. Screw rod, 7. Part, 71. Flange, 8. Positioning screw. Detailed Implementation
[0014] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.
[0015] To address the instability issues that often arise during wire EDM machining of parts with small clamping surfaces in medical device manufacturing, and to effectively avoid the risk of parts being burned and scrapped due to unstable clamping, a special wire EDM fixture for multi-part machining was designed and developed. For example... Figure 1 and Figure 2 As shown, the fixture adopts a modular design, mainly consisting of three parts: a base 1, a fixture body 2, and locking blocks 3. The base 1, serving as the basic support component of the entire fixture, is L-shaped and is fixed to the wire EDM table with bolts. The fixture body 2 is fitted into the mounting groove 11 on the upper surface of the base 1 and fixed with bolts. The fixture body 2 has machining holes 21 running through its entire length, and also has workpiece placement holes 22 that communicate with the machining holes 21, used for neatly arranging and placing the parts 7 to be processed. To ensure the reliability of clamping, locking blocks 3 are symmetrically arranged on both sides of the fixture body 2. These locking blocks 3 are connected to the base 1 via a hinge structure, allowing them to be flipped. In the initial state, the locking blocks 3 on both sides are in the unfolded state. At this time, the part 7 can be inserted into the workpiece placement hole 22 from the outer locking surface 23 of the fixture 2. After the two rows of parts 7 are neatly placed in the workpiece placement hole 22, the locking blocks 3 can be flipped to firmly press the part 7, so that the part to be processed extends into the processing hole 21, providing stable clamping conditions for subsequent wire cutting. The wire cutting wire enters the processing hole 21 for electrical discharge machining.
[0016] To ensure stable placement of the fixture body 2, a mounting groove 11 is provided in the middle of the base 1. The fixture body 2 is fixedly installed in the mounting groove 11. Locking blocks 3 are rotatably mounted on both sides of the fixture body 2 via pins 4. The two sides of the fixture body 2 opposite to the locking blocks 3 are locking surfaces 23. Workpiece placement holes 22 are correspondingly arranged on the two locking surfaces 23, and are arranged in a linear array along the length of the fixture body 2. When the part 7 is placed into the workpiece placement hole 22, the locking blocks 3 on both sides are closed, and the locking blocks 3 on both sides are locked with long screws 5, thereby ensuring that the part 7 will not shift during processing.
[0017] To ensure that the locking block 3 provides sufficient thrust for the part 7 to extend into the machining hole 21 when closed, without damaging the part 7, an elastic element 6 is provided on the locking block 3 corresponding to the workpiece placement hole 22. This elastic element 6 is used to push the part 7 placed in the workpiece placement hole 22 into the machining hole 21. The locking block 3 has an elastic groove 31 that can accommodate the elastic element 6. After the locking block 3 is closed, the elastic element 6 on the locking block 3, which is opposite to the part 7, pushes the part 7 into the machining hole 21 until the flange 71 at the end of the part 7 abuts against the locking surface 23, at which point the part 7 is securely clamped. To facilitate the pushing operation of the elastic element 6, a clearance groove 33 is also provided between the fixture body 2 and the locking block 3 to accommodate the movable pin 61 and the flange 71 of the part 7.
[0018] like Figure 3 and 4 As shown, specifically, the elastic element 6 includes a movable pin 61, a spring 62, and a screw rod 63. The screw rod 63 restricts the spring 62 and the movable pin 61 within the elastic groove 31. The locking block 3 has an elastic hole 32 communicating with the elastic groove 31 on the side near the tooling body 2. The movable pin 61 is movably disposed within the elastic hole 32 by the spring 62, and the movable pin 61 abuts against the end of the part 7. When the locking block 3 is in the unfolded state, the movable pin 61 extends out from the elastic hole 32 under the elastic force of the spring 62, and the stepped end of the movable pin 61 abuts against the connecting surface of the elastic groove 31 and the elastic hole 32. When the locking block 3 is closed, the movable pin 61 abuts against the part 7, and the stepped end of the movable pin 61 moves towards the screw rod 63 and compresses the spring 62. The compressed spring 62 always applies a pushing force to the part 7 to fix the part 7 within the machining hole 21. The fixing effect of the screw rod 63 not only limits the movement range of the spring 62 and the movable pin 61, but also enhances the reliability of the overall structure.
[0019] like Figure 5 and 6 As shown, to prevent part 7 from falling out of the workpiece placement hole 22, a flange 71 is provided at the end of part 7. The diameter of flange 71 is larger than the diameter of workpiece placement hole 22. Flange 71 abuts against the locking surface 23 of the fixture body 2 under the pushing action of movable pin 61. The flange 71 ensures that the part to be processed of part 7 extends completely into the processing hole 21.
[0020] To further ensure stable clamping of part 7, the fixture body 2 is also provided with a positioning hole 24 communicating with the workpiece placement hole 22. A positioning screw 8 is installed in the positioning hole 24, and the positioning screw 8 abuts vertically against the side of part 7 placed in the workpiece placement hole 22. The positioning screw 8 is a MISUMI screw with a rounded end to reduce the pressure on the surface of part 7 and avoid damage to part 7. The positioning screw 8 cooperates with the elastic element 6 to apply force to part 7 from two directions, ensuring the stability of part 7 during processing.
[0021] During processing, the L-shaped base 1 is fixedly mounted on the wire EDM machining table, so that the machining hole 21 is vertically positioned. Then, the locking blocks 3 on both sides are unfolded, and the part 7 is placed into the workpiece placement hole 22 from the locking surfaces 23 on both sides of the fixture body 2. After placement, the locking blocks 3 on both sides are closed and locked with long screws 5, so that the elastic element 6 on the locking block 3 pushes the part 7 to be processed into the machining hole 21, thus completing the clamping of the part 7. The wire EDM device is then started, and the wire EDM wire enters the machining hole 21 to perform electrical discharge machining on the part 7. The above description is illustrative only and not restrictive of this utility model. Those skilled in the art will understand that many modifications, variations, or equivalents can be made without departing from the spirit and scope defined by the appended claims, and all such modifications, variations, or equivalents will fall within the protection scope of this utility model.
Claims
1. A multi-part machining fixture for wire EDM, characterized in that: The fixture includes a base (1), a fixture body (2), and a locking block (3). The fixture body (2) is mounted on the base (1). The fixture body (2) has a through machining hole (21) along its length. The fixture body (2) also has a workpiece placement hole (22) that communicates with the machining hole (21) for placing the part (7). Locking blocks (3) are provided on both sides of the fixture body (2). The locking blocks (3) are rotatably connected to the base (1) so that the part (7) placed in the workpiece placement hole (22) extends into the machining hole (21).
2. The wire EDM multi-part machining fixture according to claim 1, characterized in that: The base (1) has an installation groove (11) in the middle. The tooling body (2) is fixedly installed in the installation groove (11). The locking blocks (3) are symmetrically arranged on both sides of the tooling body (2) by means of pins (4). The locking blocks (3) on both sides are fixedly connected by long screws (5).
3. A wire EDM multi-part machining fixture according to claim 2, characterized in that: The two sides of the tooling body (2) opposite to the locking block (3) are locking surfaces (23). The workpiece placement holes (22) are correspondingly arranged on the two locking surfaces (23). The workpiece placement holes (22) are arranged in a linear array along the length of the tooling body (2).
4. A wire EDM multi-part machining fixture according to claim 3, characterized in that: The locking block (3) is provided with an elastic element (6) corresponding to the workpiece placement hole (22), which is used to push the part (7) placed in the workpiece placement hole (22) into the machining hole (21). The locking block (3) is provided with an elastic groove (31) that can accommodate the elastic element (6).
5. A wire EDM multi-part machining fixture according to claim 4, characterized in that: The elastic element (6) includes a movable pin (61), a spring (62) and a screw rod (63). The screw rod (63) restricts the spring (62) and the movable pin (61) within the elastic groove (31). The locking block (3) has an elastic hole (32) communicating with the elastic groove (31) on the side near the tooling body (2). The movable pin (61) is movably disposed within the elastic hole (32) by the spring (62). The movable pin (61) abuts against the end of the part (7).
6. A wire EDM multi-part machining fixture according to claim 5, characterized in that: The end of the part (7) is provided with a flange (71), the diameter of which is larger than the diameter of the workpiece placement hole (22). The flange (71) abuts against the locking surface (23) of the tooling body (2) under the pushing action of the movable pin (61).
7. A wire EDM multi-part machining fixture according to claim 6, characterized in that: A clearance groove (33) is also provided between the tooling body (2) and the locking block (3) to accommodate the movable pin (61) and the flange (71) of the part (7).
8. A wire EDM multi-part machining fixture according to claim 4, characterized in that: The tooling body (2) is also provided with a positioning hole (24) that communicates with the workpiece placement hole (22). A positioning screw (8) is provided in the positioning hole (24). The positioning screw (8) is perpendicular to the side of the part (7) placed in the workpiece placement hole (22).