A tooling fixture for machining the inner hole of a bushing used in an experiment.

Abstract

This invention provides a tooling fixture for machining the inner hole of a bushing used in experiments. It includes a clamping handle with a clamping unit fixed at one end. The clamping unit includes a fixed clamping part and a movable clamping part. The inner walls of the fixed and movable clamping parts are respectively arc-shaped, and the movable clamping part can move closer to or further away from the fixed clamping part. When the movable clamping part approaches the fixed clamping part to its limit position, the inner walls of the two parts can form a circle. The center of the arc of the fixed clamping part coincides with the axis of the clamping handle. This invention uses a fixed clamping part to ensure that the positioning center of the workpiece coincides with the center of the clamping handle. The movable clamping part provides a large range of motion when disassembling the workpiece, facilitating workpiece disassembly and installation. While ensuring workpiece positioning accuracy, it completes workpiece clamping and disassembly, avoiding damage to the workpiece during disassembly.

Description

Technical Field

[0001] This invention belongs to the field of machining, and in particular relates to a tooling fixture for machining the inner hole of a bushing used in an experiment. Background Technology

[0002] During product testing and production, frequent measurements are required to obtain parameters for manufactured parts. Some bushing structures, due to their thin walls and soft materials, are prone to surface damage or deformation during frequent assembly and disassembly, affecting parameter accuracy. Current technology involves cooling the bushing in liquid nitrogen before pressing it into the connecting rod's small hole using specialized tooling, followed by machining the bushing's inner bore. However, during testing and surface inspection, destructive removal is necessary—forcibly pressing the bushing out of the connecting rod's bottom hole. Because the connecting rod's bottom hole and the bushing are interference-fitted, both the connecting rod and bushing undergo deformation during this pressing process, leading to irreversible damage and unnecessary economic losses. Summary of the Invention

[0003] In view of this, the present invention aims to provide a tooling fixture for machining the inner hole of a bushing used in the experiment, so as to facilitate the fixed machining of thin-walled bushings and to facilitate the removal of bushings while maintaining machining accuracy.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] A tooling fixture for machining the inner hole of a bushing used in an experiment includes a clamping handle, one end of which is fixedly provided with a clamping unit. The clamping unit includes a fixed clamping part and a movable clamping part. The inner wall cross sections of the fixed clamping part and the movable clamping part are respectively arc-shaped. The movable clamping part can approach or move away from the fixed clamping part. When the movable clamping part approaches the fixed clamping part to its limit position, the inner walls of the two can form a circle. The center of the arc of the fixed clamping part coincides with the axis of the clamping handle.

[0006] Furthermore, the clamping handle also includes a mounting plate, on which a machining hole is formed. A sliding hole is formed on one side of the machining hole, and the machining hole and the sliding hole are connected. The fixed clamping part is fixedly connected to the hole wall of the machining hole, and the movable clamping part can move along the length direction of the sliding hole.

[0007] Furthermore, the movable clamping part is provided with sliding guide surfaces on both sides, and the sliding hole includes a guide wall and abutment wall. The sliding guide surface and the guide wall fit together, and when the movable clamping part is at the extreme position far away from the fixed clamping part, the movable clamping part can fit tightly against the abutment wall.

[0008] Furthermore, one end of the fixing clamping part extends outward to form a fixing flange, and multiple corresponding mounting holes are opened on the periphery of the machining hole and on the flange, and a bolt can pass through the mounting holes to fix the fixing clamping part at the machining hole.

[0009] Furthermore, connecting ears extend outward from both sides of the fixed clamping part and the movable clamping part, and corresponding connecting holes are opened on the connecting ears of the fixed clamping part and the movable clamping part, and a bolt can pass through the connecting holes to fix the fixed clamping part and the movable clamping part relative to each other.

[0010] Furthermore, the end of the movable clamping part extends outward to form a limiting edge, and the mounting plate has a receiving groove, in which the limiting edge and the flange are respectively placed.

[0011] Furthermore, the end of the clamping handle is fixedly connected to a substrate, the mounting plate is disposed opposite to the substrate, and corresponding through holes are opened on the edges of the substrate and the mounting plate.

[0012] Compared with the prior art, the tooling fixture for machining the inner hole of the bushing used in the experiment according to the present invention has the following advantages:

[0013] The present invention uses a fixed clamping part to make the positioning center of the workpiece coincide with the center of the clamping handle, and the movable clamping part provides a large range of motion when disassembling the workpiece, thereby facilitating the disassembly and installation of the workpiece. While ensuring the positioning accuracy of the workpiece, the clamping and disassembly of the workpiece are completed, and damage to the workpiece is avoided during the disassembly process.

[0014] By using guide surfaces on the movable clamping part, the assembly of the device can be completed with a simpler structure and fewer parts, thereby improving the working accuracy of the fixture. Attached Figure Description

[0015] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0016] Figure 1 This is a schematic diagram of the overall structure of this tooling fixture;

[0017] Figure 2 This is an exploded view of the tooling fixture;

[0018] Figure 3 This is a schematic diagram of the mounting plate structure.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1-Clamping handle; 11-Base plate; 12-Mounting plate; 121-Machining hole; 122-Sliding hole; 1221-Guide wall; 1222-Abutting wall; 123-Receiving groove; 124-Mounting hole; 2-Fixing clamping part; 21-Flanged edge; 3-Movable clamping part; 31-Limiting edge; 32-Sliding guide surface; 33-Connecting ear. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] The bushing inner hole machining fixture used in the experiment described in this invention includes a clamping handle 1, one end of which is fixedly provided with a clamping unit. The clamping unit includes a fixed clamping part 2 and a movable clamping part 3. The inner wall cross sections of the fixed clamping part 2 and the movable clamping part are respectively arc-shaped, and the movable clamping part 3 can approach or move away from the fixed clamping part 2. When the movable clamping part 3 approaches the fixed clamping part 2 to its limit position, the inner walls of the two can form a circle. In this embodiment, the formed circular structure is similar in size to the hole of the connecting rod to be tested, so as to facilitate the fixed machining of the bushing and the scientific testing of the bushing. The center of the arc of the fixed clamping part 2 coincides with the axis of the clamping handle 1, so that after the bushing is installed, the side wall of the bushing fits against the fixed clamping part 2, and the center of the bushing coincides with the center of the clamping handle 1, ensuring machining accuracy. Specifically, in order to complete the installation of the fixed clamping part 2 and the movable clamping part 3, a circular base plate 11 is fixedly provided at the end of the clamping handle 1, and a circular mounting plate 12 is disposed opposite to the base plate 11. Corresponding through holes are opened on the edges of the base plate 11 and the mounting plate 12. In this embodiment, the mounting plate 12 and the base plate 11 have the same diameter, and the center of the mounting plate 12 and the base plate 11 coincides with the axis of the clamping handle 1. A machining hole 121 is opened on the mounting plate 12, and a sliding hole 122 extends outward from one side of the machining hole 121, so that the sliding hole 122 communicates with the machining hole 121. The fixed clamping part 2 is fixedly connected to the hole wall of the machining hole 121, and the movable clamping part 3 is placed in the sliding hole 122 and can move along the length direction of the sliding hole 122. A receiving groove 123 is formed on the side of the mounting plate 12 facing the base plate 11. The outer wall of the fixing clamping part 2 is in contact with the hole wall of the machining hole 121 on the side away from the sliding hole 122. One end of the fixing clamping part 2 extends outward to form a fixing flange 21, which is placed in the receiving groove 123. Multiple corresponding mounting holes 124 are formed on the periphery of the machining hole 121 and on the flange 21. A bolt can pass through the mounting hole 124 to fix the fixing clamping part 2 at the machining hole 121. The base plate 11 has screw holes corresponding to the mounting holes 124. The fixing of the fixing clamping part 2 is completed by bolts. One end of the movable clamping part 3 extends outward to form a limiting edge 31, which is also placed in the receiving groove 123 and connected to each other through the base plate 11 and the mounting plate 12 to prevent the movable clamping part 3 from disengaging from the sliding hole 122. The sliding clamping part has sliding guide surfaces 32 on both sides. The sliding hole 122 includes a guide wall 1221 and an arc-shaped abutment wall 1222 arranged opposite to each other. The sliding guide surface 32 and the guide wall 1221 fit together, and when the movable clamping part 3 is in the extreme position away from the fixed clamping part 2, the movable clamping part 3 can fit tightly against the abutment wall 1222.

[0026] Connecting ears 33 extend outward from both sides of the fixed clamping part 2 and the movable clamping part 3, and corresponding connecting holes are opened on the connecting ears 33 of the fixed clamping part 2 and the movable clamping part 3, respectively. The fixed clamping part 2 and the movable clamping part 3 are fixed relative to each other by passing bolts through the connecting holes.

[0027] The bushing inner hole machining fixture used in the experiment described in this invention involves first fixing the clamping handle 1 to the three-jaw chuck of the machine tool during operation, and adjusting the angle of the clamping handle 1 so that the clamping handle 1 coincides with the axis of the three-jaw chuck. Then, the three-jaw chuck is rotated so that the fixed clamping part 2 is positioned below, and the bushing to be machined is placed in the machining hole 121, so that the side wall of the bushing is in contact with the inner wall of the fixed clamping part 2, and the inner end of the bushing is in contact with the base plate 11. The movable clamping part 3 is controlled to move towards the fixed clamping part 2 so that the movable clamping part 3 is in contact with the outer wall of the bushing. The bushing is fixed by passing a bolt through the connecting lug 33. Then, the bushing is machined by the machine tool. After the machining is completed, the bolt is removed, the bushing is taken out, and the subsequent scientific research work is completed.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tooling fixture for machining the inner hole of a bushing used in an experiment, characterized in that: The device includes a clamping handle, one end of which is fixedly provided with a clamping unit. The clamping unit includes a fixed clamping part and a movable clamping part. The inner wall cross-sections of the fixed clamping part and the movable clamping part are respectively arc-shaped. The movable clamping part can move closer to or away from the fixed clamping part. When the movable clamping part moves closer to the fixed clamping part to the limit position, the inner walls of the two parts can form a circle. The center of the arc of the fixed clamping part coincides with the axis of the clamping handle. The clamping handle also includes a mounting plate, on which a machining hole is formed. A sliding hole is formed on one side of the machining hole and the machining hole communicates with the sliding hole. The fixed clamping part is fixedly connected to the hole wall of the machining hole, and the movable clamping part can move along the length direction of the sliding hole. The movable clamping part is provided with sliding guide surfaces on both sides. The sliding hole includes a guide wall and abutment wall. The sliding guide surface and the guide wall fit together. When the movable clamping part is at the extreme position away from the fixed clamping part, the movable clamping part can fit tightly against the abutment wall. One end of the fixing clamping part extends outward to form a fixing flange. Multiple corresponding mounting holes are opened on the periphery of the machining hole and on the flange. A bolt can pass through the mounting holes to fix the fixing clamping part at the machining hole.

2. The tooling fixture for machining the inner hole of a bushing used in an experiment according to claim 1, characterized in that: Connecting ears extend outward from both sides of the fixed clamping part and the movable clamping part, and corresponding connecting holes are opened on the connecting ears of the fixed clamping part and the movable clamping part, and a bolt can pass through the connecting holes to fix the fixed clamping part and the movable clamping part relative to each other.

3. The tooling fixture for machining the inner hole of a bushing used in an experiment according to claim 1, characterized in that: The end of the movable clamping part extends outward to form a limiting edge, and the mounting plate has a receiving groove, in which the limiting edge and the flange are respectively placed.

4. The tooling fixture for machining the inner hole of a bushing used in an experiment according to claim 1, characterized in that: The end of the clamping handle is fixedly connected to a substrate, the mounting plate is disposed opposite to the substrate, and corresponding through holes are opened on the edges of the substrate and the mounting plate.

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