Disposable clamping fixture for machining motor base

Abstract

The present invention provides a disposable clamping fixture for machining a motor base, wherein one end of a cantilever parallel to the axial direction is connected to a chuck body, a positioning block is provided at the suspension end of the cantilever, claws extending radially inward are provided at both ends of the positioning block, the claws at both ends are clamped on the process steps A1 machined out of the outer circle of the ear pieces at both ends of the motor base A, and the inner end of the positioning block and the chuck body are arranged at a distance in the axial direction. In this way, the turning of the stopper and the end face of the inner end can be realized, and of course, the turning of the stopper and the end face of the suspension end can also be completed in this clamping state.

Description

Technical Field

[0001] The invention relates to a tool for turning a motor base. Background Art

[0002] At present, the I-shaped stopper die used in the turning processing tooling of the motor base is clamped and fixed by the stopper at one end and the mounting hole of the base. After the stopper and the core stop at one end are finished by fine turning, it is necessary to turn around and perform secondary clamping to finish the stopper at the other end. Since secondary clamping is required during fine turning, it is difficult to ensure the coaxiality of the stoppers and the core stop at both ends. Moreover, the stopper die and the stopper of the base are clearance-matched, and factors such as offset or excessive clearance may occur during fine turning, which will increase the coaxiality error and seriously affect the quality of the motor. A Chinese patent document entitled "A motor casing processing device" (authorization announcement number CN 203679810 U) aims to process the motor casing of both end face stoppers and the inner surface of the casing at one time to improve the coaxiality of the end face stoppers and the parallelism of the end faces. The technical solution provides a clamping device, which includes two clamping plates (2) and a distance adjustment mechanism. The clamping plates (2) are provided with a casing end face sleeve connecting sleeve (6), and the distance adjustment mechanism is arranged between the two clamping plates (2) for expanding and contracting the relative distance between the two clamping plates (2). The distance adjustment mechanism includes four adjustment screws (3). The main technical defects of the above-mentioned prior art include that the constraint area surrounded by the four circumferentially distributed adjusting screws (3) cannot realize the motor base from the area between the two adjusting screws (3) to be placed between the two clamping plates (2), so the clamping process is extremely time-consuming; at the same time, the constraint force applied by the clamping plates (2) to the two ends of the motor base is achieved by tightening the nuts at the outer ends of the four adjusting screws (3) one by one, not only can the four adjusting screws (3) not be uniformly stressed, but the pre-tightening is time-consuming and labor-intensive, and the stability of the motor base is difficult to ensure. Summary of the invention

[0003] The purpose of the present invention is to provide a one-time clamping fixture for processing a motor base, which can complete the processing of the stoppers and core blocks at both ends of the base in one clamping, thereby improving the coaxiality of the stoppers at both ends and the parallelism of the two end surfaces while improving the clamping efficiency.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme, a disposable clamping fixture for processing a motor base, characterized in that: one end of the cantilever parallel to the axial direction is connected to the chuck body, the suspended end of the cantilever has a positioning block, and the two ends of the positioning block have claws extending radially inward, and the claws at the two ends are respectively clamped on the process steps A1 processed on the outer circle of the ear pieces at both ends of the motor base A, and the inner end of the positioning block and the chuck body are arranged at a distance in the axial direction.

[0005] Since the claws at both ends of the positioning block are clamped on the two ends of the motor base, the motor base is reliably fixed. During clamping and adjustment, the claws are distributed on the same cylindrical surface. At the same time, since the claws are clamped on the process step A1 processed on the outer circle of the ear pieces at both ends of the motor base A, the motor base A is axially limited and fixed and radially centered. In addition, the axial space reserved for the spacing arrangement between the inner end of the positioning block and the chuck body makes it convenient for the tool to reach the end face of the motor base A close to one end of the chuck body, so that the stopper and end face of the inner end can be turned. Of course, the stopper and end face of the suspended end can also be turned in this clamping state. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 , 5 They are schematic diagrams of the structures of the present invention;

[0007] Figure 2 , 6 They are Figure 1 , 5 Right view of;

[0008] Figure 3 , 7 They are schematic diagrams of the structure of the present invention in use state;

[0009] Figure 4 , 8 They are Figure 3 , 7 Right view of . DETAILED DESCRIPTION

[0010] As shown in the figure, the disposable clamping fixture for processing the motor base includes a cantilever 20 parallel to the axial direction, one end of which is connected to the chuck body 10, and the chuck body 10 is connected to the spindle box power output shaft. The suspended end of the cantilever 20 is connected to a positioning block 30, and the two ends of the positioning block 30 have radially inwardly extending claws 31, and the claws 31 at both ends are respectively clamped on the process steps A1 processed on the outer circle of the ear pieces at both ends of the motor base A, and the inner end of the positioning block 30 and the chuck body 10 are arranged at a distance in the axial direction.

[0011] The positioning block 30 and the cantilever 20 in the above scheme can be integrated, or they can be separated and then connected into one. The above-mentioned chuck body 10 can be understood as a chuck for clamping workpieces on a general lathe, and the seat is driven to rotate by the power output of the spindle box. As a conventional three-jaw or four-jaw chuck, it can only be clamped on one end of the motor base A to perform processing on the suspended end, and then adjusted and re-clamped to complete the processing of the other suspended end. The present invention provides a sufficiently long cantilever 20 to utilize the length advantage of the cantilever 20 to achieve one-time clamping of the two ends of the motor base A, and ensure that there is enough axial spacing between the end of the motor base A close to the chuck body 10 and the chuck 10, so that the tool can smoothly reach the inner end of the motor base A to perform turning processing. The present invention is provided with a positioning block 30 connected to the cantilever 20, which can reduce the difficulty of processing components.

[0012] As a preferred solution, 3 to 4 cantilevers 20 are symmetrically arranged on the chuck body 10 in the circumferential direction. In this way, the cantilever 20 can be connected by using the connection method of the three-jaw or four-jaw chuck in the prior art, that is, the cantilever 20 can be installed on the three-jaw or four-jaw chuck in the prior art and can be used without providing a separate chuck body 10. Of course, if the size of the motor base A to be processed is too large, a special chuck body 10 can be provided and connected with the original chuck on the lathe.

[0013] In the scheme of processing the cantilever 20 and the positioning block 30 into independent components and then connecting them, the suspension end of the cantilever 20 is located in the middle of the length direction of the positioning block 30 and the two form a detachable connection. This scheme is convenient for use in the case where there are differences in the axial length and radial dimensions of the motor base A. It is only necessary to replace the positioning block 30 of the corresponding length to adapt to the axial length of the motor base, which can improve the applicability of the fixture.

[0014] In order to improve the bending strength of the positioning block 30 and facilitate lightweighting, the present invention adopts the following preferred technical solution: a toothed strip plate 32 is provided on the side of the claw 31 in the circumferential direction, and its tooth peak extends toward the side where the shaft core is located and forms an embedded accommodation fit with the heat sink A2 on the motor base A. The toothed strip plate 32 and the heat sink A2 on the motor base A are mutually compatible and will not cause interference in the positioning fit part. The provision of the toothed strip plate 32 not only improves the bending resistance of the positioning block 30 itself, but also assists in improving the bending resistance of the cantilever 20.

[0015] Combination Figure 2 , 4The four-claw clamping scheme shown is that the cantilever 20 is symmetrically arranged on the chuck body 10 in the circumferential direction. The claw 31 on the positioning block 30 at the middle high position is arranged in the middle, and the toothed strips 32 are symmetrically arranged on both sides. The claws 31 on the positioning blocks 30 at the left and right positions are arranged at the lower position. The toothed strips 32 on the positioning blocks 30 at the left and right positions are located at the upper part of the claws 31, and the toothed strips 32 on the positioning blocks 30 at the middle low position are evenly distributed in the circumferential direction. The three claws 31 on the three positioning blocks 30 at the left, right and high positions are basically spaced 120° in the circumferential direction, which is consistent with the spacing range of the ear pads spaced in the circumferential direction at both ends of the motor base A.

Claims

1. A disposable clamping fixture for machining a motor base, characterized in that: One end of a cantilever (20) parallel to the axial direction is connected to the chuck body (10), the suspension end of the cantilever (20) is provided with a positioning block (30), and both ends of the positioning block (30) are provided with claws (31) extending radially inward, and the claws (31) at both ends are clamped on the process steps A1 processed on the outer circle of the ear pieces at both ends of the motor base A, and the inner end of the positioning block (30) and the chuck body (10) are arranged at a distance in the axial direction; The suspension end of the cantilever (20) is located in the middle of the length direction of the positioning block (30) and a detachable connection is formed between the two; The claw (31) has a toothed strip plate (32) on the side in the circumferential direction, the tooth peak of which extends toward the side where the shaft core is located and forms an embedded accommodation fit with the heat sink A2 on the motor base A; Four cantilevers (20) are symmetrically arranged on the chuck body (10) in the circumferential direction. The claws (31) on the positioning block (30) located in the middle and high position are arranged in the center, and the toothed strips (32) are symmetrically arranged on both sides. The claws (31) on the positioning blocks (30) located in the left and right positions are arranged in the lower position. The toothed strips (32) on the positioning blocks (30) in the left and right positions are located above the claws (31). The toothed strips (32) on the positioning block (30) located in the middle and low position are evenly distributed in the circumferential direction.

2. The clamp according to claim 1, characterized in that: Three to four cantilevers (20) are symmetrically arranged on the chuck body (10) in a circumferential direction.

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