Disc-shaped part linear cutting clamp

Abstract

The invention provides a disc-shaped part linear cutting clamp which comprises a base, a pressing plate, a positioning pin, a supporting block and a screw, the base is fixed to an equipment platform through a universal clamping device of a linear cutting equipment platform, a machined part is in a disc shape, a center hole is formed in the center of the machined part, four first round through holes are evenly distributed in the disc, and the base is in a square plate shape; a through hole is formed in the center of the base, two second circular through holes are machined in the two sides of the through hole of the base along the linear position, supporting blocks are connected to the four corners of the base, one end of a pressing plate is pressed on the supporting blocks, the other end of the pressing plate is pressed on a machined part, and the pressing plate is in threaded connection with the base through screws to press and fix the machined part. According to the invention, the parallelism after the base is installed is ensured, the perpendicularity form and location tolerance requirement of a processed part is further ensured, the positioning accuracy of the processed part is effectively ensured by the positioning pin, the symmetry degree and the dimensional accuracy of the processed part are further ensured, and the processing efficiency and the product quality consistency are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wire cutting, and particularly relates to a disc-shaped part wire cutting clamp. BACKGROUND

[0002] The clamping and fixing of disc-shaped parts in the wire cutting process is a relatively tricky problem. Due to the special shape of the parts, displacement or deformation is likely to occur in high-speed cutting, which directly affects the final machining precision. The core problem of clamping disc-shaped parts in wire cutting is how to provide sufficient constraint without causing deformation and ensure accurate positioning reference.

[0003] The main technical problems are as follows: 1. Clamping stability and deformation control: the contact area of disc-shaped parts in conventional clamps is limited, and the parts are easily affected by the discharge impact force of the electrode wire during machining, resulting in micro movement. Thin-walled disc-shaped parts are also easily deformed under the action of pressing force. The processed parts meet the requirements of the drawings, but the size is out of tolerance after unloading due to springback. The cutting force, internal residual stress and uneven clamping force distribution caused by improper clamping during the wire cutting process of disc-shaped parts may all cause deformation.

[0004] 2. Difficulty in positioning and alignment accuracy control: disc-shaped parts lack clear edge reference, and the accuracy of traditional alignment methods is limited. When multiple process machining is required, it is difficult to ensure the accurate alignment of the processed part and the to-be-processed part. When disc-shaped blanks are processed into polygonal features, the eccentricity of the blank and the required contour will cause the shape deviation of the finished product.

[0005] 3. Clamping difficulty caused by special structure: disc-shaped parts with flanges are prone to end face runout in traditional clamping, affecting the perpendicularity of the machined surface and the reference surface. Disc-shaped parts with multiple cavities or complex features need to be positioned multiple times during processing, and conventional clamps cannot guarantee the relative position accuracy between cavities. SUMMARY

[0006] The technical problem solved by the present application is to provide a disc-shaped part wire cutting clamp, which solves the problems of poor clamping stability, easy deformation, low machining precision, difficult positioning and clamping difficulty in the prior art.

[0007] The technical solution adopted in this invention is as follows: a wire EDM fixture for disc-shaped parts, comprising a base, a pressure plate, a positioning pin, a support block, and screws. The base is fixed to the equipment platform by a universal clamping device for wire EDM equipment. The part to be processed is disc-shaped with a central hole in the center. Four first circular through holes are evenly distributed on the disc. The base is a square plate with a through hole in the center. Two second circular through holes are machined along a straight line on both sides of the through hole in the base. The second circular through holes are concentric with the first circular through holes and the diameter of the second circular through holes is smaller than that of the first circular through holes. The base is provided with threaded holes. Support blocks are connected to the four corners of the base. One end of the pressure plate presses on the support block and the other end presses on the part to be processed. The pressure plate is connected to the base by screws to press and fix the part to be processed.

[0008] Preferably, the positioning pin is a cylinder with multiple segments of unequal diameters, which, from top to bottom, are a head, a first transition segment, a first mating segment, a second transition segment, and a second mating segment. The outer diameter of the first mating segment is the same as the diameter of the first circular through hole, and the mating clearance is ≤0.02mm. The outer diameter of the second mating segment is the same as the diameter of the second circular through hole, and the mating clearance is ≤0.02mm. The outer diameters of both the first and second transition segments are smaller than the outer diameter of the second mating segment. The end face of the head contacts the plane of the workpiece. The first mating segment is inserted into the first circular through hole, and the second mating segment is inserted into the second circular through hole.

[0009] Preferably, the base is provided with a leveling band around its perimeter. The dimensional positional relationship between the leveling band and the second circular through hole is the same as the part dimensional positional relationship required by the design, so that the wire cutting position after leveling meets the design requirements.

[0010] Preferably, the parallelism between the upper and lower surfaces of the base is no greater than 0.01 mm.

[0011] The beneficial effects of this invention are: 1. It ensures the parallelism of the base after installation, thereby ensuring the perpendicularity and geometric tolerance requirements of the machined parts.

[0012] 2. The outer circle of the locating pin is designed with a stepped structure, with the size of the first half of the outer circle being smaller than that of the second half. This not only facilitates the passage of the locating pin through the workpiece and makes operation easier, but also ensures the fit clearance between the locating pin and the first and second circular through holes, effectively guaranteeing the positioning accuracy of the workpiece. This, in turn, ensures the symmetry and dimensional accuracy of the workpiece, improving processing efficiency and product quality consistency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a wire EDM fixture for disc-shaped parts.

[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of a wire EDM fixture for disc-shaped parts.

[0015] Figure 3 This is a schematic diagram of the base structure.

[0016] Figure 4 This is a schematic diagram of the locating pin structure.

[0017] Figure 5 This is a schematic diagram of the structure of the part being processed.

[0018] Figure 6 This is a schematic diagram of wire cutting of the workpiece.

[0019] Figure 7 This is a schematic diagram of the part structure after wire EDM.

[0020] Reference numerals: 1-base, 2-pressure plate, 3-locating pin, 4-support block, 5-screw, 6-worked part, 101-aligning belt, 102-through hole, 103-second circular through hole, 301-head, 302-first transition section, 303-first mating section, 304-second transition section, 305-second mating section, 601-first circular through hole, 602-wire cutting position. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] like Figure 5 As shown, the part being processed, 6, is a disc-shaped part made of steel. Figure 6 As shown, the workpiece 6 is cut into four pieces by wire cutting at wire cutting position 602, and its structure is as follows. Figure 7 As shown, the cut parts must be used in pairs. During use, the semi-circular arc at the first circular through hole 601 contacts and engages with the piston part. The thread of the center hole contacts and engages with the external thread of the gear ring. The symmetry of its width relative to the corresponding datum axis must be ≤0.02mm, and the perpendicularity of the two sides relative to the datum surface must be ≤0.03mm. These two geometric tolerances have high precision requirements and are particularly important for the actual use of the parts. The part has a simple external structure, and the only parts that can be used for positioning and clamping are the upper and lower planes of the part and the four first circular through holes 601. In actual production, it is difficult to guarantee geometric tolerances and dimensional tolerances, and it is difficult to directly measure various dimensions and geometric tolerances during processing, making it difficult to guarantee the consistency of product processing quality.

[0023] The principle of this invention is as follows: The wire EDM fixture of this invention uses one pair of first circular through holes 601 of the workpiece 6 as a reference for positioning. High-precision positioning pins 3 are used to fix the workpiece 6 onto the fixture through the first circular through holes 601, achieving precise and angular positioning of the workpiece 6. Simultaneously, the pressure plate 2 is used to fix the workpiece 6, preventing rotation during wire EDM and ensuring that the workpiece 6 is evenly cut into four pieces. This effectively guarantees the accuracy of various dimensions and geometric tolerances, significantly improving production efficiency and ensuring the consistency of part dimensional accuracy. Furthermore, after the first piece is successfully processed and tested through the through holes 102 of the base 1, subsequent workpieces 6 only need to be positioned on the base 1 using the positioning pins 3. This simple operation effectively improves production efficiency and ensures consistent quality across multiple products.

[0024] like Figure 1 and Figure 2 As shown, a wire EDM fixture for a disc-shaped part includes a base 1, a pressure plate 2, a positioning pin 3, a support block 4, and screws 5. The base 1 is fixed to the equipment platform by a universal clamping device for wire EDM equipment platforms. The part to be processed 6 is disc-shaped with a central hole and four first circular through holes 601 evenly distributed on the disc. Figure 3 As shown, the base 1 is a square plate with a through hole 102 at its center. Two second circular through holes 103 are machined along a straight line on both sides of the through hole 102. The second circular through holes 103 are concentric with the first circular through hole 601, and their diameters are smaller than the first circular through hole 601. The base 1 has threaded holes, and support blocks 4 are placed at the four corners of the base 1. The height of the support blocks 4 is the same as the thickness of the workpiece 6. One end of a pressure plate 2 presses against the support block 4, and the other end presses against the workpiece 6. The pressure plate 2 is threaded to the base 1 with screws 5 to press and fix the workpiece 6. A leveling band 101 is provided around the base 1. The dimensional and positional relationship between the leveling band 101 and the second circular through holes 103 and 102 corresponds to the design requirements of the part dimensions, ensuring that the wire cutting position after leveling meets the design requirements. The parallelism between the upper and lower surfaces of the base 1 is no greater than 0.01 mm.

[0025] like Figure 4As shown, the locating pin 3 is a cylinder with multiple segments of unequal diameters, which, from top to bottom, are a head 301, a first transition segment 302, a first mating segment 303, a second transition segment 304, and a second mating segment 305. The outer diameter of the first mating segment 303 is the same as the diameter of the first circular through hole 601, with a mating clearance ≤ 0.02 mm. The outer diameter of the second mating segment 305 is the same as the diameter of the second circular through hole 103, with a mating clearance ≤ 0.02 mm. The outer diameters of the first transition segment 302 and the second transition segment 304 are both smaller than the outer diameter of the second mating segment 305. The end face of the head 301 is in contact with the plane of the workpiece 6. The first mating segment 303 is inserted into the first circular through hole 601, and the second mating segment 305 is inserted into the second circular through hole 103.

[0026] Before wire EDM, the base 1 is first placed on the platform of the wire EDM equipment and initially fixed using the equipment's universal fixing device. Then, the alignment band 101 of the base 1 is checked using a dial indicator, and the alignment band 101 is straightened to determine the positions of the two second circular through holes 103. Finally, the position of the base 1 is tightened using the equipment's universal fixing device. After fixing the base 1, the upper end face of the base 1 is checked again using a dial indicator to ensure that the runout of the upper end face of the base 1 is no more than 0.01mm, which can effectively ensure that the perpendicularity of the part after wire EDM is no more than 0.03.

[0027] After the base 1 is clamped and fixed in position, the workpiece 6 to be processed is placed on the base 1, wherein a pair of first circular through holes 601 of the workpiece 6 corresponds to a pair of second circular through holes 103 of the base. Then, a pair of locating pins 3 are used to pass through the first circular through holes 601 and the second circular through holes 103 respectively. The first mating section 303 of the locating pin 3 mates with the first circular through hole 601 of the workpiece 6, ensuring a mating clearance ≤ 0.02mm. The second mating section 305 of the locating pin 3 mates with the second circular through hole 103 of the base 1, ensuring a mating clearance ≤ 0.02mm. The diameter of the second mating section 305 of the locating pin 3 is smaller than the diameter of the first mating section 303, which facilitates the passage of the locating pin 3 through the first circular through hole 601 of the workpiece 6. At the same time, by limiting the mating clearance between the locating pin 3, the workpiece 6, and the inner hole of the base 1, the clamping position accuracy of the workpiece 6 can be effectively guaranteed, ultimately ensuring the symmetry of the workpiece 6 after wire cutting.

[0028] After fixing the workpiece, before wire cutting the workpiece, remove the positioning pin 3. Simply align the second circular through hole 103 of the base 1. When processing other parts, simply follow the above steps to position the workpiece 6 using the positioning pin 3 to meet the processing accuracy requirements.

[0029] The above describes specific embodiments of the present invention and the technical principles employed. Any modifications or equivalent transformations based on the technical solutions of the present invention should be included within the protection scope of the present invention.

Claims

1. A wire cutting fixture for disc-shaped parts, characterized in that: The device includes a base, pressure plate, positioning pins, support blocks, and screws. The base is fixed to the equipment platform using a universal clamping device for wire cutting equipment. The workpiece is disc-shaped with a central hole and four first circular through holes evenly distributed on the disc. The base is a square plate with a central through hole and two second circular through holes machined along a straight line on both sides of the central through hole. The second circular through holes are concentric with the first circular through holes and their diameters are smaller than the first circular through holes. The base has threaded holes, and support blocks are connected to the four corners of the base. One end of the pressure plate presses on the support block, and the other end presses on the workpiece. The pressure plate is connected to the base by screws to press and fix the workpiece.

2. The wire EDM fixture for disc-shaped parts according to claim 1, characterized in that: The locating pin is a cylinder with multiple segments of unequal diameters, consisting of a head, a first transition segment, a first mating segment, a second transition segment, and a second mating segment from top to bottom. The outer diameter of the first mating segment is the same as the diameter of the first circular through hole, with a mating clearance ≤ 0.02 mm. The outer diameter of the second mating segment is the same as the diameter of the second circular through hole, with a mating clearance ≤ 0.02 mm. The outer diameters of both the first and second transition segments are smaller than the outer diameter of the second mating segment. The end face of the head contacts the plane of the workpiece. The first mating segment is inserted into the first circular through hole, and the second mating segment is inserted into the second circular through hole.

3. A wire EDM fixture for disc-shaped parts according to claim 2, characterized in that: The base is provided with a leveling band around its perimeter. The dimensional and positional relationship between the leveling band and the second circular through hole is the same as the dimensional and positional relationship of the part required by the design, so that the wire cutting position after leveling meets the design requirements.

4. The wire EDM fixture for disc-shaped parts according to claim 1, characterized in that: The parallelism between the upper and lower surfaces of the base is no greater than 0.01 mm.

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