Clamping fixture for processing external spline of spline shaft for high-voltage switch
By first machining the internal spline hole on the spline shaft for high-voltage switches and then fixing it with positioning components and clamping blocks, the problem of inconsistent angles between the external and internal splines was solved, achieving high-precision external spline machining and reducing the defect rate and production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI HUAPENG TECH CO LTD
- Filing Date
- 2025-05-07
- Publication Date
- 2026-04-17
AI Technical Summary
In the current technology for machining spline shafts for high-voltage switches, it is difficult to keep the tooth groove angles of the external spline and the internal spline consistent, resulting in low machining accuracy and high scrap rate. Furthermore, the compact structure of high-voltage switches limits the use of traditional auxiliary holes.
The method of first machining the internal spline hole is adopted, and the clamping angle is defined by the internal spline hole. The workpiece is fixed by positioning components and clamping blocks to ensure the machining accuracy of the external spline. Wire EDM is used to reduce the deformation caused by cutting force.
It improves the machining accuracy of external splines, reduces the defect rate, reduces machining errors caused by deformation, and lowers production costs.
Smart Images
Figure CN224129168U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fixture technology, specifically to a clamping fixture for machining the external spline of a spline shaft used in high-voltage switches. Background Technology
[0002] A type of high-voltage switch splined shaft is a shaft-like part with an external spline 01 at one end and an internal spline hole 02 at the other end, such as... Figure 1 As shown.
[0003] In the existing processing technology, for shaft parts with this structure, the common method is to first use a lathe to machine the external spline at one end. The lathe can shape the tooth profile, module and dimensional accuracy of the external spline according to the design requirements. When machining the internal spline, the shaft sidewall is clamped according to the tooth profile angle of the external spline, and then milling is used to complete the manufacturing of the blind hole of the internal spline. However, in this process, because milling generates a large cutting force, it may cause the workpiece to deform, which will change the relative positional relationship between the machined external spline and the internal spline being machined, and it will be difficult to keep the tooth groove angle consistent.
[0004] Currently, the conventional approach in the industry to solve this problem is to set auxiliary holes perpendicular to the spline shaft for positioning. With the help of these auxiliary holes, special jigs or locating pins can be used for precise positioning when machining the internal spline to ensure the angle relative to the external spline during clamping. However, in the actual application scenarios of high-voltage switches, due to the requirements of component reliability, sealing performance, and overall structural compactness, the spline shaft for high-voltage switches to be machined in this application cannot be equipped with such auxiliary holes. On the other hand, it still does not solve the problem of the impact of elastic deformation of the workpiece material under the action of broaching force on the accuracy of the tooth groove angle. Because the tooth groove angles of the external and internal splines are difficult to match, it will affect the performance and operational stability of the high-voltage switch. Therefore, the existing machining methods have a high scrap rate and high production cost. Utility Model Content
[0005] To address the aforementioned technical problems, the present invention provides a clamping fixture for machining the external spline of a high-voltage switch spline shaft. This fixture can first machine the internal spline hole of the spline shaft, and then limit the clamping angle through the internal spline hole to improve the machining accuracy of the external spline.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0007] This utility model provides a clamping fixture for machining the external spline of a high-voltage switch spline shaft, comprising a support frame, a first clamping block, a second clamping block, and a positioning assembly. The first clamping block is fixed on the support frame; the second clamping block is slidably fixed on the support frame; the sliding direction of the second clamping block relative to the support frame is vertical; the positioning assembly includes a horizontal extension plate and a positioning block; the horizontal extension plate is detachably fixed on the support frame; a fixing hole is provided on the horizontal extension plate; the positioning block includes an external spline structure that can match the internal spline of the workpiece; when the internal spline of the workpiece is sleeved on the positioning block, the internal spline of the workpiece and the external spline structure are engaged; the positioning block is detachably fixed on the horizontal extension plate; the positioning block can be inserted from below the fixing hole and pass through the fixing hole for fixation.
[0008] The high-voltage switch spline shaft external spline machining clamping fixture provided by this utility model preferably has a square groove at the lower opening of the fixing hole; a square protrusion is fixed at the bottom of the positioning block; the square protrusion matches the square groove; the lower opening of the square groove is located on the lower side of the horizontal extension plate; a plurality of first threaded holes are provided at the bottom of the square groove; a plurality of second threaded holes are passed through the square protrusion; the first threaded holes and the second threaded holes have the same thread specification; when the square protrusion is in the square groove, the first threaded holes and the second threaded holes can be aligned.
[0009] The high-voltage switch spline shaft external spline machining clamping fixture provided by this utility model preferably has the first clamping block disposed above the second clamping block.
[0010] The high-voltage switch spline shaft external spline machining clamping fixture provided by this utility model preferably has the following features: the first clamping block and the second clamping block have the same shape; the projections of the first clamping block and the second clamping block in the vertical direction coincide; and both the first clamping block and the second clamping block have several positioning holes through them in the vertical direction.
[0011] The high-voltage switch spline shaft external spline machining clamping fixture provided by this utility model preferably has a square first fixing block provided on the side of the horizontal extension plate; the support frame has a square receiving hole in the horizontal direction; the receiving hole matches the size of the first fixing block; the first fixing block can be inserted into the receiving hole for fixation.
[0012] This utility model provides a clamping fixture for machining the external spline of a spline shaft for a high-voltage switch, relating to the field of fixture technology. It includes a support frame, a first clamping block, a second clamping block, and a positioning assembly. The first clamping block is fixed to the support frame. The second clamping block is slidably fixed to the support frame. The sliding direction of the second clamping block is vertical relative to the support frame. The positioning assembly includes a horizontal extension plate and a positioning block. The horizontal extension plate is detachably fixed to the support frame. A fixing hole is provided on the horizontal extension plate. The positioning block includes an external spline structure that matches the internal spline of the workpiece. When the internal spline of the workpiece is fitted onto the positioning block, the internal spline of the workpiece and the external spline structure are engaged. The positioning block is detachably fixed to the horizontal extension plate. The positioning block can be inserted from below the fixing hole and pass through the fixing hole for fixation. The clamping fixture for machining the external spline of a spline shaft for a high-voltage switch provided by this utility model solves the problem of high defect rate of spline shafts for high-voltage switches in the prior art, and can improve the machining accuracy of spline shafts for high-voltage switches and reduce the defect rate. Attached Figure Description
[0013] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the gist of the invention.
[0014] Figure 1 This is a schematic diagram of the overall structure of the splined shaft for high-voltage switches provided in the background technology of this utility model.
[0015] Figure 2 This is a schematic diagram of the structure of the clamping fixture for machining the external spline of the high-voltage switch spline shaft provided in Embodiment 1 of this utility model when clamping the high-voltage switch spline shaft.
[0016] Figure 3 This is a schematic diagram of the overall structure of the high-voltage switch spline shaft external spline machining clamping fixture provided in Embodiment 1 of this utility model when there is no fixed positioning block.
[0017] Figure 4 This is a schematic diagram of the square groove position of the clamping fixture for machining the external spline of the high-voltage switch spline shaft provided in Embodiment 1 of this utility model.
[0018] Figure 5 This is a schematic diagram of the clamping block structure of the clamping fixture for machining the external spline of the high-voltage switch spline shaft provided in Embodiment 1 of this utility model.
[0019] Figure 6 This is a schematic diagram of the structure when the clamping block of the clamping fixture for machining the external spline of the high-voltage switch spline shaft provided in Embodiment 1 of this utility model is inserted into the internal spline hole of the high-voltage switch spline shaft. Detailed Implementation
[0020] Example 1: The high-voltage switch spline shaft external spline machining clamping fixture provided in Example 1 of this utility model, such as... Figures 1 to 6 As shown, the assembly includes a support frame 1, a first clamping block 2, a second clamping block 3, and a positioning component 4. The first clamping block 2 is fixed to the support frame 1. The second clamping block 3 is slidably fixed to the support frame 1. The sliding direction of the second clamping block 3 relative to the support frame 1 is vertical. The positioning component 4 includes a horizontal extension plate 41 and a positioning block 42. The horizontal extension plate 41 is detachably fixed to the support frame 1. A fixing hole 411 is provided on the horizontal extension plate 41. The positioning block 42 includes an external spline structure 421 that can match the internal spline of the workpiece. When the internal spline of the workpiece is fitted onto the positioning block 42, the internal spline of the workpiece and the external spline structure 421 are engaged. The positioning block 42 is detachably fixed to the horizontal extension plate 41. The positioning block 42 can be inserted from below the fixing hole 411 and pass through the fixing hole 411 for fixation.
[0021] In the present invention, embodiment 1 provides a clamping fixture for machining the external spline of a high-voltage switch spline shaft. During use, the support frame 1 is directly fixed to the wire cutting equipment. By engaging the internal spline hole 02 of the high-voltage switch spline shaft with the external spline structure 421 of the positioning block 42, the rotation of the high-voltage switch spline shaft along its (vertical) axis is restricted, thus ensuring that the angle of the high-voltage switch spline shaft is fixed relative to the position of the support frame 1. Then, the upper bottom surface 011 and lower bottom surface 012 of the external spline 01 of the high-voltage switch spline shaft are respectively pressed and fixed by the first clamping block 2 and the second clamping block 3. The lower side of the first clamping block 2 applies downward pressure to the upper bottom surface 011 of the external spline 01, and the second clamping block 3 applies upward pressure to the lower bottom surface 012 of the external spline 01, thereby achieving vertical fixation of the high-voltage switch spline shaft. Simultaneously, the friction between the first clamping block 2, the second clamping block 3, and the external spline 01 restricts the water flow of the high-voltage switch spline shaft. Moving horizontally, the positioning block 42 is moved downwards from the fixing hole 411 of the horizontal extension plate 41 and separated. Then the horizontal extension plate 41 is removed to avoid the presence of the horizontal extension plate affecting the wire cutting process. Compared with the existing technology of first machining the external spline 01 and then broaching the internal spline hole 02, which is prone to workpiece deformation when machining the internal spline hole 02, thus affecting the tooth groove angle between the external spline 01 and the internal spline hole 02, this embodiment first machines the internal spline hole 02. After the internal spline hole 02 is machined, the external spline is machined by wire cutting (wire cutting uses an electrode wire as a tool electrode to melt or vaporize metal materials through high temperature generated by pulse discharge. Unlike traditional cutting, it does not rely on mechanical force to remove materials, so there is no significant cutting force, which greatly reduces the possibility of workpiece deformation due to external force). Therefore, the final high-voltage switch spline shaft has higher precision, lower scrap rate, and thus lower processing cost.
[0022] The external spline machining clamping fixture for high-voltage switch spline shafts provided in Embodiment 1 of this utility model solves the problem of high defect rate of high-voltage switch spline shafts in the prior art. It can first machine the internal spline hole of the spline shaft, and then limit the clamping angle through the internal spline hole to improve the machining accuracy of the external spline, improve the accuracy of the tooth groove angle between the internal spline hole and the external spline, and reduce the defect rate.
[0023] In this embodiment, a square groove 412 is provided on the lower opening of the fixing hole 411; a square protrusion 43 is fixed on the bottom of the positioning block 42; the square protrusion 43 matches the square groove 412; the lower opening of the square groove 412 is located on the lower side of the horizontal extension plate 41; a plurality of first threaded holes 4121 are provided on the bottom of the square groove 412; a plurality of second threaded holes 431 are passed through the square protrusion 43; the first threaded holes 4121 and the second threaded holes 431 have the same thread specification; when the square protrusion 43 is in the square groove 412, the first threaded holes 4121 and the second threaded holes 431 can be aligned. By tightly matching the square groove and the square protrusion, high-precision positioning of the positioning block can be achieved in both the horizontal and vertical directions. When installing the positioning block, the operator only needs to align the square protrusion with the square groove and insert it, then pass the screw through the second threaded hole 431 and the first threaded hole 4121 in sequence and tighten the screw. The horizontal extension plate 41 and the positioning block 42 need to be separated from the high-voltage switch spline shaft to avoid the presence of the horizontal extension plate 41 and the positioning block 42 affecting the operation of the wire cutting. By moving the positioning block 42 downward to separate the positioning block 42 from the horizontal extension plate 41, and then separating the horizontal extension plate 41 from the high-voltage switch spline shaft, the squeezing force generated during separation can be reduced (because the square protrusion 43 can only move vertically in the square groove 412, this can avoid the external spline structure 421 of the positioning block 42 fixed on the square protrusion 43 from being squeezed by the internal spline hole 02 due to the change in the movement direction of the square protrusion 43), thereby reducing the deformation that the internal spline hole 02 may cause, and ensuring the finished product quality of the high-voltage switch spline shaft.
[0024] To specifically achieve the clamping of the external spline 01 by the first clamping block 2 and the second clamping block 3, in this embodiment, the first clamping block 2 is positioned above the second clamping block 3; the first clamping block 2 and the second clamping block 3 have the same shape; the projections of the first clamping block 2 and the second clamping block 3 in the vertical direction coincide; and both the first clamping block 2 and the second clamping block 3 have several positioning holes 21 extending through them in the vertical direction. Preferably, in this embodiment, the first clamping block 2 and the second clamping block 3 actually clamp the blank portion of the external spline 01 (in this embodiment, the preferred blank portion is a cylinder with a diameter larger than the outer diameter of the external spline 01, and the first clamping block 2 and the second clamping block 3 contact the portion of the blank that exceeds the outer diameter of the external spline 01), the purpose of which is to avoid interference between the projections of the first clamping block 2 and the second clamping block 3 in the vertical direction and the electrode wire during wire cutting.
[0025] As a preferred embodiment, in this case, a square first fixing block 413 is provided on the side of the horizontal extension plate 41; a square receiving hole 11 is provided in the horizontal direction of the support frame 1; the size of the receiving hole 11 matches that of the first fixing block 413; the first fixing block 413 can be inserted into the receiving hole 11 for fixation. The horizontal extension plate 41 is fixed by inserting the first fixing block 413 into the receiving hole 11 in the horizontal direction. Since both the receiving hole 11 and the first fixing block 413 are square, the receiving hole 11 will restrict the rotation of the first fixing block 413. After the first fixing block 413 is inserted into the receiving hole 11, it can ensure that the surface of the horizontal extension plate 41 is horizontal, thereby ensuring that the axial direction of the fixing hole 411 of the horizontal extension plate 41 is vertical, thereby ensuring that the spline shaft for the high-voltage switch can be clamped accurately.
[0026] In summary, this utility model provides a clamping fixture for machining the external spline of a high-voltage switch spline shaft, relating to the field of fixture technology. It includes a support frame, a first clamping block, a second clamping block, and a positioning assembly. The first clamping block is fixed to the support frame. The second clamping block is slidably fixed to the support frame. The second clamping block is vertical relative to the sliding direction of the support frame. The positioning assembly includes a horizontal extension plate and a positioning block. The horizontal extension plate is detachably fixed to the support frame. A fixing hole is provided on the horizontal extension plate. The positioning block includes an external spline structure that matches the internal spline of the workpiece. When the internal spline of the workpiece is fitted onto the positioning block, the internal spline of the workpiece and the external spline structure are engaged. The positioning block is detachably fixed to the horizontal extension plate. The positioning block can be inserted from below the fixing hole and pass through the fixing hole for fixation. The clamping fixture for machining the external spline of a high-voltage switch spline shaft provided by this utility model solves the problem of high defect rate of high-voltage switch spline shafts in the prior art, and can improve the machining accuracy of high-voltage switch spline shafts and reduce the defect rate.
[0027] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.
Claims
1. An outer spline machining clamp for spline shafts for high-voltage switches, characterized in that, Includes a support frame, a first clamping block, a second clamping block, and a positioning assembly; The first clamping block is fixed on the support frame; The second clamping block is slidably fixed on the support frame; the second clamping block is vertical relative to the sliding direction of the support frame; The positioning component includes a horizontal extension plate and a positioning block; The horizontal extension plate is detachably fixed to the support frame; The horizontal extension plate is provided with fixing holes; The positioning block includes an external spline structure that can match the internal spline of the workpiece; when the internal spline of the workpiece is fitted onto the positioning block, the internal spline of the workpiece and the external spline structure are engaged. The positioning block is detachably fixed to the horizontal extension plate; the positioning block can be inserted from below the fixing hole and fixed through the fixing hole.
2. The outer spline machining clamp jig for spline shafts for high voltage switches according to claim 1, characterized in that, The lower opening of the fixing hole is provided with a square groove; a square protrusion is fixed to the bottom of the positioning block; the square protrusion matches the square groove; The lower opening of the square groove is located on the lower side of the horizontal extension plate; The bottom of the square groove is provided with a plurality of first threaded holes; the square protrusion is provided with a plurality of second threaded holes. The first threaded hole and the second threaded hole have the same thread specification; When the square protrusion is located within the square groove, the first threaded hole and the second threaded hole can be aligned.
3. The outer spline machining clamp jig for spline shafts of high voltage switches according to claim 1, characterized in that, The first clamping block is positioned above the second clamping block.
4. The outer spline machining chucking jig for spline shafts for high voltage switches according to claim 3, characterized in that, The first clamping block and the second clamping block have the same shape; the projections of the first clamping block and the second clamping block in the vertical direction coincide. Both the first clamping block and the second clamping block have several positioning holes through them in the vertical direction.
5. The outer spline machining clamp jig for spline shafts of high voltage switches according to claim 1, characterized in that, A square first fixing block is provided on the side of the horizontal extension plate; a square receiving hole is opened in the horizontal direction of the support frame; the receiving hole matches the size of the first fixing block; The first fixing block can be inserted into the receiving hole for fixation.