A multi-station inner support clamp for wire cutting

Abstract

The utility model relates to a kind of multi-station inner support clamps for wire cutting in wire cutting clamp technical field, including base and several inner support components, and several inner support components are arrayed distribution along base length and width direction, and inner support component includes guiding seat and inner support sleeve, and inner support rod is equipped in guiding seat, and inner support rod one end is equipped with the pressure block matched with inner support sleeve.The utility model drives pressure block and inner support sleeve cooperation by sliding inner support rod, so that inner support sleeve and guiding seat abut, and inner support sleeve is expanded radially outward, realize the uniform support and fixed to workpiece inner wall, avoid workpiece outer surface stress deformation or produce indentation, protect the surface integrity of thin-walled sleeve class workpiece.And through several inner support components arrayed distribution along base length and width direction, realize the batch clamping to thin-walled sleeve class workpiece, so that wire cutting machining of multiple workpieces can be completed in one machining, to improve machining efficiency, ensure the consistency of machining accuracy.

Description

Technical Field

[0001] This utility model relates to the field of wire EDM fixture technology, specifically to a multi-station internal support fixture for wire EDM. Background Technology

[0002] A fixture is a device used in mechanical manufacturing to fix a workpiece in the correct position for machining or inspection; it is also called a clamp. Broadly speaking, any device used to quickly, conveniently, and safely install a workpiece at any stage of the manufacturing process can be called a fixture. In wire EDM, the workpiece is precisely positioned and fixed in the machining position using a fixture, and then non-contact cutting is achieved through pulsed discharge between the electrode wire and the workpiece, realizing high-precision cutting.

[0003] Existing wire EDM fixtures use V-blocks or circular grooves to clamp the outer contour of cylindrical workpieces for fixed mounting. However, when the workpiece is a thin-walled sleeve-like part, its low radial stiffness makes external clamping fixtures prone to deformation, affecting machining accuracy and even causing cracking or cutting misalignment. Furthermore, when high precision is required for the workpiece's appearance or outer contour dimensions, external clamping can easily cause indentations or damage to the workpiece surface during clamping, affecting surface quality and reducing yield. Therefore, this invention proposes a multi-station internal support fixture for wire EDM. Summary of the Invention

[0004] This utility model provides a multi-station internal support fixture for wire EDM. Through the internal support component, it realizes the internal support and fixation of thin-walled sleeve-type workpieces, solving the problem that existing wire EDM fixtures are prone to workpiece deformation and damage to the outer surface of the workpiece when clamping thin-walled sleeve-type workpieces.

[0005] The objective of this utility model is achieved through the following means: A multi-station internal support fixture for wire EDM includes a base and a plurality of internal support components disposed on both sides of the base, wherein the plurality of internal support components are arranged in an array along the length and width directions of the base; The inner support assembly includes a guide seat and an inner support sleeve sleeved on the outside of the guide seat. The guide seat is provided with an inner support rod that can slide back and forth. One end of the inner support rod is provided with a pressure block that cooperates with the inner support sleeve.

[0006] Furthermore, the outer side of the guide seat is provided with a guide block that cooperates with the inner support sleeve, and the inner side of the inner support sleeve is provided with a guide groove that cooperates with the guide block.

[0007] Furthermore, the cross-section of the guide block is a tapered structure.

[0008] Furthermore, the pressure block is a conical block, and one end of the inner support sleeve is provided with a conical groove that mates with the conical block.

[0009] Furthermore, the pressure block is a stepped block, and one end of the inner support sleeve is provided with a stepped groove that mates with the stepped block.

[0010] Furthermore, the inner support rod is slidably engaged with the guide seat via a threaded connection.

[0011] Furthermore, the other end of the inner support rod is provided with a piston block, and the guide seat is provided with a piston groove that slides with the piston block. The two ends of the piston groove are respectively provided with a first through hole and a second through hole.

[0012] Furthermore, one end of the base is provided with a plurality of first channels and second channels that cooperate with the first through hole and the second through hole, and one end of the first channel and the second channel is provided with a connector for connection to the outside.

[0013] Furthermore, each of the guide seats is provided with a directional positioning hole, and the base is provided with a number of directional positioning pins that cooperate with the positioning holes.

[0014] Furthermore, one end of the base is provided with a support frame for connection to the outside.

[0015] The beneficial effects of this utility model are as follows: The sliding inner support rod drives the pressure block to engage with the inner support sleeve, causing the inner support sleeve to abut against the guide seat and push the inner support sleeve to expand radially outward. This achieves uniform support and fixation of the workpiece's inner wall, preventing deformation or indentation on the workpiece's outer surface and protecting the surface integrity of thin-walled sleeve-type workpieces. Furthermore, by using several inner support components arrayed along the length and width of the base, batch clamping of thin-walled sleeve-type workpieces is achieved, allowing multiple workpieces to be wire-cut in a single operation, thereby improving processing efficiency and ensuring consistent processing accuracy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a multi-station internal support fixture for wire EDM in Embodiment 1; Figure 2 for Figure 1 Enlarged diagram of A in the middle; Figure 3 This is a partial sectional view of a multi-station internal support fixture for wire EDM in Embodiment 1; Figure 4 This is a cross-sectional view of the internal support component in the exploded state in Embodiment 1; Figure 5 This is a schematic diagram of the structure of a multi-station internal support fixture for wire EDM in Embodiment 2; Figure 6 for Figure 5 Enlarged diagram of B in the middle; Figure 7 This is a cross-sectional view of a multi-station internal support fixture for wire EDM in Embodiment 2; Figure 8 for Figure 7 Enlarged diagram of C in the middle; Figure 9 This is a partial sectional view of a multi-station internal support fixture for wire EDM in Embodiment 2; Figure 10 This is a cross-sectional view of the internal support assembly in the exploded state in Embodiment 2; The reference numerals in the figure are as follows: 1-base, 11-first channel, 12-second channel, 13-connector, 2-inner support assembly, 21-guide seat, 211-guide block, 212-directional positioning hole, 213-piston groove, 214-first through hole, 215-second through hole, 22-inner support sleeve, 221-guide groove, 222-conical groove, 223-step groove, 23-inner support rod, 24-pressure block, 241-conical block, 242-step block, 25-piston block, 3-directional positioning pin, 4-support frame. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Example

[0018] In this embodiment, refer to Figure 1 - Figure 4 The specific implementation of the multi-station internal support fixture for wire cutting includes a base 1 and several internal support components 2 disposed on both sides of the base 1. The several internal support components 2 are arranged in an array along the length and width of the base 1. The internal support component 2 includes a guide seat 21 and an internal support sleeve 22 sleeved on the outside of the guide seat 21. The guide seat 21 is provided with an internal support rod 23 that can slide back and forth. One end of the internal support rod 23 is provided with a pressure block 24 that cooperates with the internal support sleeve 22.

[0019] Both ends of the inner support sleeve 22 are provided with several main dividing grooves. The arrangement of the main dividing grooves divides the inner support sleeve 22 into multiple elastic petals. Under the axial thrust of the pressure block 24, the multiple elastic petals can generate radial elastic deformation, which uniformly supports the inner hole of the workpiece, thereby achieving centering and clamping.

[0020] A stress relief hole is provided at one end of the main dividing groove. The stress relief hole is used to disperse and eliminate stress concentration, which can effectively extend the service life of the inner support sleeve 22 and reduce the risk of breakage of the inner support sleeve 22 during repeated elastic deformation.

[0021] The outer side of the guide seat 21 is provided with a guide block 211 that mates with the inner support sleeve 22, and the inner side of the inner support sleeve 22 is provided with a guide groove 221 that mates with the guide block 211. The cross-section of the guide block 211 is tapered. The shape of the guide groove 221 matches that of the guide block 211. The mate between the guide groove 221 and the guide block 211 allows the inner support sleeve 22 to gradually and smoothly expand radially along the tapered surface of the guide block 211 when it is compressed, ensuring that each elastic lobe deforms synchronously and improving the concentricity of the clamping. When the inner support sleeve 22 loses the external force, it can gradually return to its original position along the guide block 211 by relying on its own elastic restoring force, thereby releasing the workpiece and facilitating quick disassembly.

[0022] In this embodiment, the pressure block 24 is a conical block 241, and one end of the inner support sleeve 22 is provided with a conical groove 222 that mates with the conical block 241. Through the cooperation of the conical block 241 and the conical groove 222, both ends of the inner support sleeve 22 can be subjected to uniform force, thereby achieving simultaneous inward contraction or outward expansion of both ends, ensuring symmetry and stability during the clamping process.

[0023] The inner support rod 23 is slidably connected to the guide seat 21 via a threaded connection. The guide seat 21 has a threaded hole that mates with the inner support rod 23. By engaging the threaded section of the inner support rod 23 with the threaded hole, the axial movement of the inner support rod 23 is achieved, thereby compressing or releasing the conical block 241. The other end of the inner support rod 23 has an internal hexagonal recess or a Phillips head recess, etc., which facilitates the use of tools such as an internal hexagonal wrench or a Phillips head screwdriver to drive the inner support rod 23 to rotate, thereby controlling its axial displacement, compressing or releasing the conical block 241, and adjusting the radial deformation of the elastic flap of the inner support sleeve 22 to clamp and loosen the inner hole of the workpiece.

[0024] In use, the workpiece to be processed is placed on the outside of the inner support sleeve 22 and close to the surface of the positioning seat. Then, the inner support rod 23 is rotated by a tool, causing the conical block 241 to slide axially along the guide seat 21, compressing the inner support sleeve 22. Subsequently, through the cooperation of the guide groove 221 and the conical groove 222 with the guide block 211 and the conical block 241 respectively, the two ends of the inner support sleeve 22 expand radially synchronously until they tightly fit the inner wall of the workpiece, achieving high-precision centering and stable clamping.

[0025] After the wire EDM process is completed, the inner support rod 23 is rotated in the opposite direction to release the compressive force on the conical block 241 and the inner support sleeve 22. The elastic flap of the inner support sleeve 22 retracts and resets under its own elastic force, releasing the clamping force on the inner hole of the workpiece. The conical block 241 is pushed back by the contraction of the conical groove 222 to avoid frictional resistance between the inner support sleeve 22 and the inner hole of the workpiece, thus ensuring smooth disassembly.

[0026] Furthermore, since the inner support sleeve 22 achieves radial uniform deformation under the dual guiding action of the guide block 211 and the conical block 241, it can achieve high-precision centering and stable clamping of the workpiece, effectively avoiding processing errors caused by eccentricity or uneven force.

[0027] Throughout the clamping process, the elastic deformation of the inner support sleeve 22 remains within a controllable range. Combined with the synergistic effect of the guide block 211 and the conical block 241, this ensures synchronous movement of each elastic segment, further improving repeatability and positioning accuracy. This structure is suitable for precision clamping of thin-walled workpieces, exhibiting excellent stability and reliability, especially in wire EDM machining where micro-deformation requirements are stringent. The clamping force can be precisely limited by controlling the movement of the inner support rod 23, thereby preventing elastic failure or workpiece deformation due to excessive expansion of the inner support sleeve 22, ensuring a safe and controllable clamping process.

[0028] The guide seat 21 has multiple mounting holes evenly distributed around its perimeter. The base 1 has threaded holes corresponding to the mounting holes. Through the cooperation of bolts, mounting holes, and threaded holes, the guide seat 21 can be firmly fixed to the base 1, ensuring its spatial position and installation accuracy, and guaranteeing that the guide seat 21 remains stable during processing. In use, the number and installation position of the inner support components 2 can be adjusted according to actual processing requirements, achieving flexible adaptation to workpieces of different sizes.

[0029] When the workpiece has a through hole, the workpiece can be positioned directionally through the through hole, thereby ensuring the consistency of the workpiece's orientation during processing. Several guide seats 21 are each provided with directional positioning holes 212 that mate with the through holes, and the base 1 is provided with several directional positioning pins 3 that mate with the positioning holes. The inner support sleeve 22 is provided with clearance grooves that mate with the directional positioning pins 3. The clearance grooves prevent interference between the directional positioning pins 3 and the inner support sleeve 22 during radial expansion or contraction, ensuring that the directional positioning pins 3 can smoothly insert into or withdraw from the directional positioning holes 212, thereby achieving precise orientation of the workpiece.

[0030] During installation, the bolts, mounting holes, and threaded holes work together to ensure that the directional positioning holes 212 in the same column or row are arranged concentrically, thus facilitating the unification of directional positioning references and improving the consistency and repeatability of multi-station clamping. Subsequently, the directional positioning pin 3 is used to precisely align the workpiece through hole and the directional positioning hole 212, thereby restricting the circumferential degree of freedom of the workpiece and ensuring that the orientation is completely consistent in each clamping.

[0031] In use, multiple workpieces are sequentially fitted onto several inner support sleeves 22, aligning the through holes on the workpieces with the directional positioning holes 212. Then, by inserting the directional positioning pins 3 into the through holes and directional positioning holes 212, the workpieces in the same row or column can be positioned angularly in a consistent direction. This unified directional positioning datum effectively eliminates angular deviations caused by individual clamping, ensuring the consistency of the machining direction of each workpiece, thereby guaranteeing a high degree of uniformity in the relative positions of the geometric elements of each workpiece during batch processing.

[0032] One end of the base 1 is provided with a support frame 4 for external connection. The support frame 4 is used to support and stabilize the entire fixture, fixing the fixture to the worktable of the wire cutting equipment to ensure no vibration or displacement during processing. In this embodiment, the support frame 4 has an L-shaped structure, with its vertical arm used to connect to the base 1, and its horizontal arm fixed to the worktable surface of the equipment by bolts, forming a stable support system.

[0033] A reinforcing rib structure is used between the vertical and horizontal arms to improve overall rigidity and seismic performance, prevent bending deformation of the vertical arm under stress, and ensure the constant spatial position of the base 1 and guide seat 21. The reinforcing ribs have a triangular cross-section and are evenly distributed at the connection between the vertical and horizontal arms, thereby further enhancing the structure's torsional and bending resistance. This ensures the stability of the clamp under dynamic loads and extends its service life.

[0034] The beneficial effects of this utility model are as follows: The sliding inner support rod 23 drives the pressure block 24 to cooperate with the inner support sleeve 22, causing the inner support sleeve 22 to abut against the guide seat 21. This pushes the inner support sleeve 22 to expand radially outward, achieving uniform support and fixation of the workpiece's inner wall, thereby preventing deformation or indentation on the workpiece's outer surface and effectively protecting the surface integrity of thin-walled sleeve-type workpieces. Furthermore, by arranging several inner support components 2 in an array along the length and width of the base 1, batch clamping of thin-walled sleeve-type workpieces is achieved, allowing multiple workpieces to be wire-cut in a single operation, thus improving processing efficiency and ensuring consistent processing accuracy. Example

[0035] like Figure 5 - Figure 10 As shown, the difference between this embodiment and Embodiment 1 is that the pressure block 24 is a stepped block 242, and one end of the inner support sleeve 22 is provided with a stepped groove 223 that mates with the stepped block 242. Through the cooperation of the stepped block 242 and the stepped groove 223, the inner support sleeve 22 can be squeezed to expand radially while restricting the axial movement of the inner support sleeve 22, preventing it from detaching from the guide seat 21 in a loose state, thus avoiding phenomena such as the sleeve falling off, thereby improving the reliability and safety of clamping.

[0036] The other end of the inner support rod 23 is provided with a piston block 25. The guide seat 21 is provided with a piston groove 213 that slides with the piston block 25. The two ends of the piston groove 213 are respectively provided with a first through hole 214 and a second through hole 215. One end of the base 1 is provided with a number of first channels 11 and second channels 12 that cooperate with the first through holes 214 and the second through holes 215. One end of each of the first channels 11 and the second channel 12 is provided with a connector 13 for external connection. The connector 13 is used to connect to an external pneumatic or hydraulic system, and to input or discharge pressure medium into the piston groove 213 through the first through holes 214 and the second through holes 215, thereby driving the piston block 25 to reciprocate in the groove, thereby driving the inner support rod 23 to move axially, realizing the compression and release of the pressure block 24 on the inner support sleeve 22, and completing the automatic clamping and loosening of the workpiece.

[0037] The inner support rod 23 is provided with a clearance groove that cooperates with the directional positioning pin 3. The clearance groove can prevent the directional positioning pin 3 from interfering with the inner support rod 23, thereby ensuring the smooth insertion and removal of the directional positioning pin 3 in the positioning seat 21, and ensuring the accuracy of the circumferential positioning of the workpiece and the smoothness of the operation.

[0038] In use, the first channel 11 and the second channel 12 can be sequentially connected to multiple first through holes 214 and second through holes 215 to form a multi-point synchronous pressure supply fluid passage. This allows pistons in the same row or column to move synchronously, achieving centralized control of the array-type inner support assembly 2 and significantly improving clamping efficiency. It also reduces the complexity of control pipelines and operating steps, lowering maintenance costs. By precisely controlling the input direction and flow rate of the pressure medium, the stroke of the pressure block 24 can be accurately adjusted, thereby achieving precise control of the radial expansion of the inner support sleeve 22. This avoids the risk of workpiece plastic deformation or breakage due to excessive expansion, making it particularly suitable for wire EDM machining of thin-walled sleeve-type parts with high precision requirements.

[0039] In this embodiment, by connecting multiple first through holes 214 and second through holes 215 in the same row of the first channel 11 and the second channel 12 respectively, synchronous driving of pistons in the same row is achieved. By inputting pressure medium into the first channel 11 or the second channel 12, the piston blocks 25 in the same row are controlled to move axially synchronously, thereby driving the inner support rods 23 and pressure blocks 24 to move synchronously, realizing the radial synchronous expansion or contraction of all inner support sleeves 22 in that row. This allows a single operation command to complete the synchronous clamping or unloading of the entire row of workpieces, reducing operation time and labor costs, and significantly improving the processing cycle time.

Claims

1. A multi-station internal support fixture for wire EDM, characterized in that, It includes a base (1) and a plurality of inner support components (2) disposed on both sides of the base (1), wherein the plurality of inner support components (2) are arranged in an array along the length and width directions of the base (1); The inner support assembly (2) includes a guide seat (21) and an inner support sleeve (22) sleeved on the outside of the guide seat (21). The guide seat (21) is provided with an inner support rod (23) that can slide back and forth. One end of the inner support rod (23) is provided with a pressure block (24) that cooperates with the inner support sleeve (22).

2. The multi-station internal support fixture for wire EDM according to claim 1, characterized in that: The outer side of the guide seat (21) is provided with a guide block (211) that cooperates with the inner support sleeve (22), and the inner side of the inner support sleeve (22) is provided with a guide groove (221) that cooperates with the guide block (211).

3. The multi-station internal support fixture for wire EDM according to claim 2, characterized in that: The cross-section of the guide block (211) is tapered.

4. The multi-station internal support fixture for wire EDM according to claim 1, characterized in that: The pressure block (24) is a conical block (241), and one end of the inner support sleeve (22) is provided with a conical groove (222) that cooperates with the conical block (241).

5. The multi-station internal support fixture for wire EDM according to claim 1, characterized in that: The pressure block (24) is a stepped block (242), and one end of the inner support sleeve (22) is provided with a stepped groove (223) that cooperates with the stepped block (242).

6. The multi-station internal support fixture for wire EDM according to claim 1, characterized in that: The inner support rod (23) is slidably engaged with the guide seat (21) via a threaded connection.

7. The multi-station internal support fixture for wire EDM according to claim 1, characterized in that: The other end of the inner support rod (23) is provided with a piston block (25), and the guide seat (21) is provided with a piston groove (213) that slides with the piston block (25). The two ends of the piston groove (213) are respectively provided with a first through hole (214) and a second through hole (215).

8. A multi-station internal support fixture for wire EDM according to claim 7, characterized in that: The base (1) has a plurality of first channels (11) and second channels (12) that cooperate with the first through hole (214) and the second through hole (215) at one end. Each of the first channel (11) and the second channel (12) has a connector (13) for external connection at one end.

9. A multi-station internal support fixture for wire EDM according to claim 1, characterized in that: Each of the guide seats (21) is provided with a directional positioning hole (212), and the base (1) is provided with a number of directional positioning pins (3) that cooperate with the positioning holes.

10. A multi-station internal support fixture for wire EDM according to claim 1, characterized in that: One end of the base (1) is provided with a support frame (4) that is connected to the outside.

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