External star wheel workpiece inside expansion turning fixture

Abstract

An outer star wheel workpiece inside expansion turning clamp, including mounting seat, coaxial fixed setting has fixed sleeve on the front side of mounting seat, setting has locating column on the front end surface of fixed sleeve, setting has radial through slot in the front end side surface of fixed sleeve, setting has clamping block in the radial through slot, the circumferential width of clamping block is greater than the circumferential width of the ball channel of outer star wheel workpiece, setting has inclined surface on the inner side surface of clamping block, setting has rolling ball and ejector rod in fixed sleeve, the inclined surface is tangent to rolling ball, setting has through hole in the center of mounting seat, the rear end of ejector rod passes through the through hole of mounting seat.The circumferential width of clamping block is greater than the circumferential width of the ball channel of outer star wheel workpiece, so that the outer side surface of clamping block does not contact with convex rib when clamping at any angle, so that clamping block will contact with at least one convex rib, so that it is not necessary to correct angle when clamping, improve operation convenience.

Description

Technical Field

[0001] This utility model relates to the field of machinery, and more particularly to tooling fixtures, especially a machining fixture for internal expansion of an outer planet wheel workpiece. Background Technology

[0002] The outer star wheel is a component in an automotive transmission system, primarily used in constant velocity joints to transmit power. The large end face of the outer star wheel has an inner hole with circumferentially spaced ball tracks within it. These ball tracks are used to mount the inner star wheel, and raised ribs are positioned between adjacent ball tracks. In current manufacturing processes, the outer star wheel fixture is positioned relative to the ball tracks of the outer star wheel. Therefore, the outer star wheel needs to be rotated to a specific angle to complete clamping, making the operation inconvenient and resulting in low clamping efficiency. Utility Model Content

[0003] The purpose of this utility model is to provide an internal expansion turning fixture for an outer planet wheel workpiece, which solves the technical problem in the prior art that the outer planet wheel workpiece needs to be rotated to a specific angle to complete the clamping.

[0004] This utility model provides a machining fixture for an outer planetary wheel workpiece, comprising a mounting base, a fixed sleeve coaxially fixedly mounted on the front side of the mounting base, at least three positioning pins evenly spaced along the circumferential direction on the front end face of the fixed sleeve, at least three radial through grooves evenly spaced along the circumferential direction on the front side face of the fixed sleeve, each radial through groove having a clamping block, the circumferential width of the clamping block being greater than the circumferential width of the ball track of the outer planetary wheel workpiece, the clamping block and the radial through groove forming a radial sliding pair, each clamping block having an inclined surface on its inner side, a ball bearing and a push rod being mounted in the fixed sleeve, each clamping block having an inclined surface tangent to the ball bearing, the push rod being located behind the ball bearing, the push rod having an axial direction parallel to the axial direction of the fixed sleeve, the push rod and the fixed sleeve forming an axial sliding pair, a through hole being provided at the center of the mounting base, the rear end of the push rod passing through the through hole of the mounting base.

[0005] Preferably, the front end of the fixing sleeve is provided with an end cap, and the positioning post is fixedly disposed at the front end of the end cap.

[0006] Preferably, the outer surface of the clamping block is provided with an anti-slip uneven structure.

[0007] Compared with existing technologies, this invention offers significant and positive advantages. Positioning is achieved by the positioning pin clamping against the bottom surface of the inner hole at the large end of the outer star wheel workpiece. Then, the machine tool cylinder is activated, and the piston rod drives the push rod forward to push the ball. The ball, passing through an inclined plane, pushes the clamping block radially outward. The outer side of the clamping block engages with the protruding rib of the inner hole at the large end of the outer star wheel workpiece, tightening the workpiece and completing the clamping process. This securely clamps the outer star wheel workpiece, improving positioning accuracy, machining quality, and processing efficiency. The circumferential width of the clamping block is greater than the circumferential width of the ball track on the outer star wheel workpiece. Therefore, when clamping the workpiece at any angle, the outer side of the clamping block will not only contact the ball track without contacting the protruding rib; the clamping block will always contact at least one protruding rib. Thus, angle calibration is unnecessary during clamping, improving operational convenience. Attached Figure Description

[0008] Figure 1 This is a cross-sectional schematic diagram of an external wheel workpiece internal expansion turning fixture according to the present invention.

[0009] Figure 2 This is a three-dimensional schematic diagram of an exoplane wheel workpiece internal expansion turning fixture according to the present invention.

[0010] Figure 3 This is a schematic diagram of the extraterrestrial wheel workpiece.

[0011] Figure 4 This is a schematic diagram showing the usage of an external wheel workpiece internal expansion turning fixture according to this utility model. Detailed Implementation

[0012] The present invention will be further described below with reference to embodiments, but the present invention is not limited to these embodiments. Any similar variations using the present invention should be included in the protection scope of the present invention. The use of directional terms such as up, down, front, back, left, right, middle, inside, and outside in the present invention is only for the convenience of clear description and is not intended to limit the technical solution of the present invention.

[0013] like Figures 1-4As shown, the present invention provides an internal expansion turning fixture for an outer star wheel workpiece, including a mounting base 1. A fixing sleeve 2 is coaxially fixed on the front side of the mounting base 1. At least three positioning pins 3 are equally spaced along the circumferential direction on the front end face of the fixing sleeve 2. At least three radial through grooves are equally spaced along the circumferential direction on the front side of the fixing sleeve 2. Each radial through groove is provided with a clamping block 4. The circumferential width of the clamping block 4 is greater than the circumferential width of the ball track 12 of the outer star wheel workpiece 11. The clamping block 4 and the radial through grooves form a radial sliding pair. An inclined surface 5 is provided on the inner side of each clamping block 4. A ball 6 and a push rod 7 are provided in the fixing sleeve 2. The inclined surface 5 of each clamping block 4 is tangent to the ball 6. The push rod 7 is located behind the ball 6. The axial direction of the push rod 7 is parallel to the axial direction of the fixing sleeve 2. The push rod 7 and the fixing sleeve 2 form an axial sliding pair. A through hole 8 is provided in the center of the mounting base 1. The rear end of the push rod 7 passes through the through hole 8 of the mounting base 1.

[0014] Preferably, the front end of the fixing sleeve 2 is provided with an end cap 9, and the positioning post 3 is fixedly disposed at the front end of the end cap 9.

[0015] Preferably, the outer surface of the clamping block 4 is provided with an anti-slip concave-convex structure 10.

[0016] The working principle of this utility model:

[0017] like Figure 3 As shown, the outer star wheel workpiece 11 has an inner hole on its large end face, and ball tracks 12 are arranged circumferentially in the inner hole. The ball tracks 12 are used to install the inner star wheel, and ribs 13 are arranged between adjacent ball tracks 12.

[0018] Before use, install the fixture onto the machine tool. Connect the mounting base 1 to the machine tool spindle, and connect the rear end of the push rod 7 to the piston rod of the machine tool hydraulic cylinder. During use, if... Figure 4 As shown, the outer planetary wheel workpiece 11 is fitted onto the fixed sleeve 2, and the tailstock ejector pin of the machine tool is pushed forward to tighten it. The tailstock ejector pin of the machine tool mates with the center hole of the small end of the outer planetary wheel workpiece 11, so that the positioning pin 3 is pressed against the bottom surface of the inner hole of the large end of the outer planetary wheel workpiece 11 to achieve positioning. Then, the machine tool cylinder is started, and the piston rod of the machine tool cylinder drives the push rod 7 to push the ball 6 forward. The ball 6 pushes the clamping block 4 to move radially outward through the inclined surface 5. The outer side of the clamping block 4 mates with the protruding rib 13 of the inner hole of the large end of the outer planetary wheel workpiece 11, tightening the outer planetary wheel workpiece 11 and completing the clamping. This firmly clamps the outer planetary wheel workpiece 11, thereby improving the positioning accuracy, processing quality and processing efficiency of the outer planetary wheel workpiece 11.

[0019] The circumferential width of the clamping block 4 is greater than the circumferential width of the ball track 12 of the outer star wheel workpiece 11. Therefore, when the outer star wheel workpiece 11 is clamped at any angle, the outer side of the clamping block 4 will not only contact the ball track 12 without contacting the rib 13. Thus, the clamping block 4 will contact at least one rib 13. Therefore, there is no need to check the angle during clamping, which improves the convenience of operation.

Claims

1. A machining fixture for internal expansion of an extraterrestrial wheel workpiece, characterized in that, The device includes a mounting base, a fixing sleeve coaxially fixed to the front side of the mounting base, at least three positioning pins evenly spaced along the circumferential direction on the front end face of the fixing sleeve, at least three radial through slots evenly spaced along the circumferential direction on the front side of the fixing sleeve, each radial through slot having a clamping block, the circumferential width of the clamping block being greater than the circumferential width of the ball track of the outer star wheel workpiece, the clamping block and the radial through slots forming a radial sliding pair, each clamping block having an inclined surface on its inner side, a ball and a push rod disposed in the fixing sleeve, each clamping block having an inclined surface tangent to the ball, the push rod being located behind the ball, the push rod's axis being parallel to the axis of the fixing sleeve, the push rod and the fixing sleeve forming an axial sliding pair, a through hole being provided at the center of the mounting base, the rear end of the push rod passing through the through hole of the mounting base.

2. The internal expansion turning fixture for an extraterrestrial wheel workpiece according to claim 1, characterized in that, The front end of the fixed sleeve is provided with an end cap, and the positioning post is fixedly disposed at the front end of the end cap.

3. The internal expansion turning fixture for an extraterrestrial wheel workpiece according to claim 1, characterized in that, The outer surface of the clamping block is provided with an anti-slip uneven structure.

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