Positioning clamp for machining automobile connecting piece

Abstract

A positioning clamp for machining an automobile connecting piece comprises a positioning chuck fixedly installed at the end of a main shaft, a clamping jaw is installed on the end face of the positioning chuck in a radial sliding mode, four sets of clamping positioning blocks are arranged on the clamping jaw and distributed in a central symmetry mode, and the opposite side walls of the adjacent clamping positioning blocks are machined to form arc-shaped guide faces. The arc-shaped guide surface is matched with the side wall surface of the fan-shaped bulge on the end surface of the workpiece; during positioning, the clamping and positioning blocks extend into the grooves between the adjacent fan-shaped protrusions, the clamping jaws drive the clamping and positioning blocks to move towards the center of the positioning chuck, the arc-shaped guide faces abut against the arc faces of the side portions of the fan-shaped protrusions, and therefore a workpiece is clamped and positioned. According to the positioning clamp, the clamping and positioning blocks are additionally arranged on the structure of an original positioning chuck and extend into the grooves in the workpiece, the fan-shaped protrusions on the workpiece are clamped and positioned through the clamping and positioning blocks, the non-standard workpiece is accurately positioned, and the machining precision is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of stamping, and in particular to a positioning fixture for processing automotive connecting parts. Background Technology

[0002] like Figure 4 and Figure 5 The workpiece shown is used as a connecting part in automobiles. It has an overall ring structure with a fan-shaped protrusion on one end face. After the workpiece is pressed and formed, the end face, outer peripheral face, and inner wall of the hole need to be precision machined. Since the workpiece is a non-standard structure, ordinary fixtures, such as positioning chucks, can only clamp the outer peripheral face of the workpiece and then machine the inner hole, or position the inner hole and then machine the outer peripheral face. They cannot machine multiple faces of the workpiece at the same time. Multiple positioning is required during machining, which affects the machining accuracy of the workpiece. Utility Model Content

[0003] To address the shortcomings mentioned above, this utility model provides a positioning fixture for processing automotive connecting parts.

[0004] To achieve the above objectives, this utility model provides a positioning fixture for processing automotive connecting parts, including a positioning chuck fixedly installed at the end of a spindle. A jaw is radially slidably mounted on the end face of the positioning chuck, and a clamping positioning block is provided on the jaw. The clamping positioning block is provided in four sets and is centrally symmetrically distributed. An arc-shaped guide surface is formed on the side wall opposite to the adjacent clamping positioning block, and the arc-shaped guide surface cooperates with the fan-shaped protruding side wall surface on the end face of the workpiece.

[0005] During positioning, the clamping positioning block extends into the groove between adjacent fan-shaped protrusions, and the chuck drives the clamping positioning block to move towards the center of the positioning chuck. The arc-shaped guide surface abuts against the arc surface of the side of the fan-shaped protrusion, thereby clamping and positioning the workpiece.

[0006] As a further improvement of this utility model, an inner hole is machined in the middle of the clamping and positioning block, and the inner hole is configured to cooperate with the through hole in the middle of the groove.

[0007] As a further improvement of this utility model, the right end face of the clamping and positioning block is provided with an integral side protrusion. The side protrusion is symmetrically arranged along the width direction of the clamping and positioning block. After the workpiece is positioned on the clamping and positioning block, the side protrusion abuts against the inner wall of the groove.

[0008] As a further improvement of this utility model, the clamping and positioning block is machined with an arc groove on the side facing the center of the positioning chuck, and the arc of the arc groove matches the inner wall surface of the center hole of the workpiece.

[0009] The beneficial effects of this utility model are as follows:

[0010] This positioning fixture adds a clamping positioning block to the original positioning chuck structure, which extends into the groove on the workpiece. The clamping positioning block clamps and positions the fan-shaped protrusion on the workpiece. The end of the clamping positioning block is also provided with a side protrusion that abuts against the inner wall of the groove to form an axial limit. It can accurately position non-standard workpieces, has a large contact area, and distributes force evenly during processing, effectively improving processing accuracy. Attached Figure Description

[0011] Figure 1 This is a front view of a positioning fixture for processing automotive connecting parts according to the present invention;

[0012] Figure 2 This is a side view of a positioning fixture for processing automotive connecting parts according to the present invention;

[0013] Figure 3 This is a positioning structure diagram of a positioning fixture for processing automotive connecting parts according to this utility model;

[0014] Figure 4 This is the front view of the workpiece;

[0015] Figure 5 for Figure 4 Sectional view along the AA direction.

[0016] In the diagram: 1. Spindle; 2. Positioning chuck; 21. Jaw; 3. Clamping and positioning block; 31. Inner hole; 32. Side protrusion; 33. Arc-shaped guide surface; 34. Arc-shaped groove; 4. Workpiece; 41. Center hole; 42. Fan-shaped protrusion; 421. Arc surface; 43. Groove; 44. Through hole. Detailed Implementation

[0017] like Figure 1 , Figure 2 As shown in the embodiment of this utility model, a positioning fixture for processing automotive connecting parts includes a positioning chuck 2 fixedly installed at the end of a spindle 1. A jaw 21 is radially slidably installed on the end face of the positioning chuck 2. A clamping positioning block 3 is provided on the jaw 21. The clamping positioning block 3 is provided in four sets and is centrally symmetrically distributed. An arc-shaped guide surface 33 is formed on the side wall opposite to the adjacent clamping positioning block 3. The arc-shaped guide surface 33 cooperates with the side wall surface of the fan-shaped protrusion 42 on the end face of the workpiece 4.

[0018] During positioning, the clamping positioning block 3 extends into the groove 43 between adjacent fan-shaped protrusions 42. The chuck 21 drives the clamping positioning block 3 to move towards the center of the positioning chuck 2. The arc-shaped guide surface 33 abuts against the arc surface 421 on the side of the fan-shaped protrusion 42, thereby clamping and positioning the workpiece 4. The clamping positioning block 3 has an inner hole 31 machined in the middle, which is matched with the through hole 44 in the middle of the groove 43. The right end face of the clamping positioning block 3 has an integral side protrusion 32, which is symmetrically arranged along the width direction of the clamping positioning block 3. After the workpiece 4 is positioned on the clamping positioning block 3, the side protrusion 32 abuts against the inner wall of the groove 43. The side of the clamping positioning block 3 facing the center of the positioning chuck 2 has an arc groove 34 machined, and the arc of the arc groove 34 matches the inner wall of the center hole 41 of the workpiece 4.

[0019] This positioning fixture adds a clamping positioning block to the original positioning chuck structure, which extends into the groove on the workpiece. The clamping positioning block clamps and positions the fan-shaped protrusion on the workpiece. The end of the clamping positioning block is also provided with a side protrusion that abuts against the inner wall of the groove to form an axial limit. It can accurately position non-standard workpieces, has a large contact area, and distributes force evenly during processing, effectively improving processing accuracy.

[0020] In practical use, to facilitate understanding of this utility model, the following description is provided in conjunction with the accompanying drawings;

[0021] like Figure 4 , Figure 5 The workpiece 4 shown is in the form of a ring structure with a central hole 41 at the center. A fan-shaped protrusion 42 extends radially from the end face. Four fan-shaped protrusions 42 are evenly distributed along the circumference of the workpiece 4. Arc surfaces 421 are machined on both sides of the fan-shaped protrusions 42. A groove 43 is formed between adjacent fan-shaped protrusions 42. A through hole 44 is machined at the center of the groove 43. The positioning fixture in this solution is mainly used to position the workpiece, which facilitates the fine machining of the end face, outer circumferential surface, central hole and inner wall of the through hole of the workpiece.

[0022] During positioning, the clamping positioning block extends into the groove between adjacent fan-shaped protrusions. The chuck moves the clamping positioning block towards the center of the positioning chuck. The arc-shaped guide surface abuts against the arc surface on the side of the fan-shaped protrusion, thereby clamping and positioning the workpiece and restricting its radial rotation. The side protrusion on the right end face of the clamping positioning block abuts against the inner wall of the groove to form an axial limit. The through hole in the middle of the inner hole groove of the clamping positioning block corresponds to the position. The contact area between the clamping positioning block and the workpiece is large, making it less prone to shaking during processing. Furthermore, after one positioning, the end face, outer peripheral surface, center hole, and inner wall of the through hole can be processed simultaneously without repeated positioning processing, effectively improving processing accuracy.

[0023] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A positioning fixture for machining automotive connecting parts, characterized in that: The chuck (2) is fixedly installed at the end of the spindle (1). The chuck (2) has a jaw (21) that is radially slidably installed on its end face. The jaw (21) is provided with a clamping positioning block (3). The clamping positioning block (3) is provided in four sets and is centrally symmetrically distributed. An arc-shaped guide surface (33) is formed on the side wall opposite to the adjacent clamping positioning block (3). The arc-shaped guide surface (33) cooperates with the side wall of the fan-shaped protrusion (42) on the end face of the workpiece (4). During positioning, the clamping positioning block (3) extends into the groove (43) between adjacent fan-shaped protrusions (42), and the claw (21) drives the clamping positioning block (3) to move towards the center of the positioning chuck (2). The arc-shaped guide surface (33) abuts against the arc surface (421) on the side of the fan-shaped protrusion (42), thereby clamping and positioning the workpiece (4).

2. The positioning fixture for machining automotive connecting parts according to claim 1, characterized in that: The clamping and positioning block (3) has an inner hole (31) machined in the middle, and the inner hole (31) is configured to cooperate with the through hole (44) in the middle of the groove (43).

3. A positioning fixture for processing automotive connecting parts according to claim 1, characterized in that: The clamping and positioning block (3) has an integral side protrusion (32) on its right end face. The side protrusion (32) is symmetrically arranged along the width direction of the clamping and positioning block (3). After the workpiece (4) is positioned on the clamping and positioning block (3), the side protrusion (32) abuts against the inner wall of the groove (43).

4. A positioning fixture for machining automotive connecting parts according to claim 1, characterized in that: The clamping and positioning block (3) has an arc groove (34) machined on one side facing the center of the positioning chuck (2), and the arc of the arc groove (34) matches the inner wall surface of the center hole (41) of the workpiece (4).

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