Rolling fixing device of constant velocity universal joint transmission shaft
By designing a rolling fixing device for the transmission shaft of a constant speed universal joint of a mini car, the workpiece is fixed by using magnet blocks and the stable positioning is ensured through the positioning structure, the problems of workpiece squirting and position shifting are solved, and the processing accuracy and product pass rate are improved.
Patent Information
- Application Number
- CN202421523527.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-07-01
AI Technical Summary
During the knursing process of the constant speed universal joint drive shaft of the mini car, the workpiece is prone to squirting, position offset or dropping on the bracket, resulting in a decrease in the processing dimensional accuracy and a decrease in product pass rate.
A rolling fixing device for a constant speed universal joint transmission shaft is designed, using two symmetric brackets with the same structure and magnet blocks embedded in the U-shaped frame. The shaft workpiece is fixed by magnetic force, and the bracket on the machine tool is locked through positioning holes and bolts to ensure the stable positioning of the workpiece during the processing process.
It effectively prevents workpiece twitching and positional offset, ensures concentricity and positioning accuracy during processing, improves the dimensional accuracy and product qualification rate of knurled processing, and improves production efficiency.
Smart Images
Figure CN222754944U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a rolling fixing device for a constant velocity universal joint transmission shaft, in particular to a fixing device used for a shaft part knurling process in the component processing of a constant velocity universal joint transmission shaft of a mini car. Background Art
[0002] The end of the shaft workpiece in the constant velocity universal joint transmission shaft of a mini car needs to be processed with a knurled key. The existing processing method is: the machine tool is provided with two opposite centers and a bracket, the workpiece is placed on the bracket, the center of one end of the machine tool is inserted into the center hole of the end of the workpiece, the workpiece is moved to the center of the other end of the machine tool, the two opposite centers clamp the workpiece, and the machine tool performs knurling on the shaft. After the spline processing on one end is completed, the two centers of the machine tool are released, and the bracket of the machine tool automatically rotates with the workpiece, so that the rotated workpiece is placed between the two centers, the two centers clamp the workpiece relatively, and the machine tool continues to process the spline on the other end of the shaft. In the past, during the automatic rotation of the workpiece by the machine tool, the workpiece sometimes moved on the bracket, the position was offset or it fell, etc., and the workpiece positioning was not accurate, the runout was out of tolerance, etc., which led to the decrease of processing dimensional accuracy and the decrease of product qualification rate. Under the background of increasing production, the low qualification rate of the existing processing method cannot meet the quality and efficiency requirements. Summary of the invention
[0003] The utility model aims to provide a rolling fixing device for a constant velocity universal joint transmission shaft. The use of the fixing device can prevent the shaft workpiece from moving and falling during the automatic rotation and transposition of the bracket, avoid excessive vibration during machining, and improve the quality and efficiency of shaft knurling spline machining.
[0004] The technical solution of the utility model is: a rolling fixing device for a constant velocity universal joint transmission shaft has two brackets with the same structure and symmetrical positions, the bracket is L-shaped by a horizontal frame and a vertical frame, the bottom of the horizontal frame is provided with a groove that is tightly fitted and slidably connected to the positioning boss of a machine tool, bolt holes connected to the machine tool are provided on both sides of the groove, a vertical boss is provided on the outer side of the vertical frame, transverse bolt holes are provided on both sides of the vertical boss, a workpiece fixing frame is installed on the outer side of the vertical frame, a vertical groove is provided at the lower part of the workpiece fixing frame, the vertical groove is movably fitted and connected to the vertical boss, two positioning holes are provided at the lower part of the workpiece fixing frame, the positioning holes are arranged on both sides of the vertical groove, the positioning holes are connected to the transverse bolt holes on the vertical frame by bolts, and it is characterized in that: the upper parts of the two workpiece fixing frames are U-shaped frames, and a symmetrical pair of magnet blocks are embedded on the inner wall of the U-shaped frame.
[0005] The two positioning holes are vertical long positioning holes.
[0006] When in use, the two brackets of the rolling fixture of the constant velocity universal joint transmission shaft are tightly fitted and limited with the positioning boss of the machine tool through the groove at the bottom of the cross frame, and fixed to the machine tool by bolts. The shaft is placed on the workpiece fixing frame of the bracket, and the magnet block in the U-shaped frame is tightly connected to the shaft through magnetic force. The vertical long strip positioning holes set on the workpiece fixing frame cooperate with the bolts, so that the workpiece fixing frame can move up and down within the range of the long strip positioning holes to adjust its height position on the bracket, and then locked and positioned by bolts to meet the processing position of shafts of different specifications on the machine tool.
[0007] The advantages of the rolling fixture of the constant velocity universal joint drive shaft are: since the magnet block can firmly fix the shaft workpiece, when the machine tool's bracket carries the shaft workpiece and automatically rotates to process the other end of the shaft workpiece, the shaft workpiece will not move or shift in position, thereby ensuring the concentricity of the center and the shaft. The fixture cooperates with the two centers of the machine tool to clamp the workpiece, effectively limiting the circumferential runout range of the shaft workpiece, accurately positioning the shaft on the machine tool, and improving the dimensional accuracy of the knurling key processing, thereby improving the product qualification rate, ensuring continuous production, and improving production efficiency; the fixture has a simple positioning structure and is easy to use. The magnet block arranged therein can also make the workpiece easy to take and put, and is also convenient for replacing and disassembling parts. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 The utility model is a schematic diagram of the structure of a rolling fixing device for a constant velocity universal joint transmission shaft.
[0009] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle L-shaped bracket.
[0010] Figure 3 yes Figure 2 Left view of .
[0011] Figure 4 It is a structural schematic diagram of a workpiece fixing frame.
[0012] Figure 5 yes Figure 4 Left side cross-sectional view.
[0013] Figure 6 This is a diagram showing the use status of the rolling fixture of the constant velocity joint drive shaft.
[0014] In the figure: 1 bracket, 2 workpiece fixing frame, 3 horizontal frame, 4 vertical frame, 5 vertical boss, 6 bolt hole, 7 groove, 8 horizontal bolt hole, 9 positioning hole, 10 vertical groove, 11 U-shaped frame, 12 magnet block, 13 center, 14 axis (workpiece), 15 machine tool. DETAILED DESCRIPTION
[0015] The rolling fixing device of the constant velocity universal joint transmission shaft has two brackets 1 with the same structure and symmetrical positions. The bracket is composed of a horizontal frame 3 and a vertical frame 4. The bracket is L-shaped. The bottom of the horizontal frame is provided with a groove 7 that fits with the positioning boss of the machine tool 15. The two sides of the groove are provided with bolt holes 6 connected to the machine tool. The groove fits with the positioning boss of the machine tool, and the bolt holes are fixed with the screw holes of the machine tool using threads, so that the two brackets are fixed on the machine tool. The outer side of the vertical frame is provided with a vertical boss 5, and the two sides of the vertical boss are provided with horizontal bolt holes 8. The outer side of the vertical frame is equipped with a workpiece fixing frame 2. The lower part of the workpiece fixing frame is provided with a vertical groove 10, and the vertical groove 10 is movably fitted and connected with the vertical boss 5. The lower part of the workpiece fixing frame is provided with two positioning holes 9. The positioning holes are vertical strip positioning holes. The strip positioning holes are arranged on both sides of the vertical groove. The strip positioning holes are connected with the horizontal bolt holes 8 on the vertical frame by bolts, so that the workpiece fixing frame can be adjusted up and down on the vertical frame according to needs, and then positioned and connected together by bolts. The upper part of the two workpiece fixing frames is a U-shaped frame 11, and a pair of symmetrical magnet blocks 12 are fixedly embedded on the inner wall of the U-shaped frame. When the shaft is placed on the workpiece fixing frame, the pair of magnet blocks can firmly absorb the shaft to fix it on the workpiece fixing frame.
[0016] During operation, the machine tool is started, and the center 13 on one side of the machine tool pushes the shaft to the other center and tightens it. The two centers and the shaft (workpiece) 14 are moved together to the internal gear plate of the machine tool, and the knurling key is processed. After the processing is completed, the center and the shaft (workpiece) exit the machine tool and reach the original position. The center is released and returned. The machine tool rotating device drives the shaft to rotate 180° to complete the direction change. At this time, the center on one side of the machine tool pushes the shaft to the other center and tightens it. The two centers and the workpiece are moved together to the internal gear plate of the machine tool, and the knurling key is processed. After the processing is completed, the center and the shaft exit the machine tool and reach the original position. The center is released and returned. The shaft is manually taken out, and the workpiece of another shaft is replaced. The start button is pressed and the processing is cyclic. Automatic processing can be realized, which effectively solves the problem of workpiece movement or falling during the rotation of the shaft driven by the machine tool. It improves the shift production and relieves the labor intensity of the operator.
Claims
1. A rolling fixing device for a constant velocity universal joint transmission shaft, comprising two brackets (1) with identical structures and symmetrical positions, wherein the bracket is formed into an L shape by a horizontal frame (3) and a vertical frame (4), wherein a groove (7) is provided at the bottom of the horizontal frame and is slidably connected to a positioning boss of a machine tool, and bolt holes (6) connected to the machine tool are provided on both sides of the groove, and a vertical boss (5) is provided on the outer side of the vertical frame, and transverse bolt holes (8) are provided on both sides of the vertical boss, and a workpiece fixing frame (2) is arranged on the outer side of the vertical frame, and a vertical groove (10) is provided at the lower part of the workpiece fixing frame, and the vertical groove is movably connected to the vertical boss, and two positioning holes (9) are provided at the lower part of the workpiece fixing frame, and the positioning holes are arranged on both sides of the vertical groove, and the positioning holes are connected to the transverse bolt holes on the vertical frame by bolts, characterized in that: The upper parts of the two workpiece fixing frames are U-shaped frames (11), and a pair of symmetrical magnet blocks (12) are fixedly embedded on the inner wall of the U-shaped frames.
2. The rolling fixing device for a constant velocity universal joint transmission shaft according to claim 1, characterized in that: The positioning hole (9) is a vertical long positioning hole.