Positioning tool for machining outer curved surface circular stepped hole

Abstract

The utility model discloses a kind of positioning tool for outer curved surface round step hole machining, solve outer curved surface round step hole class parts, due to the characteristics of part outer circle curved surface structure, leading to existing processing mode needs repeatedly adjusting positioning on outer circle curved surface structure, positioning efficiency is low, causing part processing precision fluctuation big, high scrap rate, seriously restrict the technical problem of high-precision parts batch production, by being positioned gap and the positioning groove on bottom wall of being positioned gap set on top wall, the radial positioning of the part to be processed is realized, set jacking device, by rotating jacking bolt, make jacking block compress the part to be processed, realize the axial positioning of the part to be processed, after the part to be processed is stably installed in the positioning tool for outer curved surface round step hole machining, connect with equipment to be installed through the positioning through-hole on vertical wall, the positioning of the positioning tool for outer curved surface round step hole machining is carried out, positioning efficiency is high, and the part to be processed is installed stably, conveniently, efficiently.

Description

Technical Field

[0001] This utility model relates to a positioning fixture for machining circular stepped holes, specifically a positioning fixture for machining circular stepped holes on an outer curved surface. Background Technology

[0002] In the mass production of high-precision parts, positioning fixtures are core equipment for ensuring machining accuracy. The positioning accuracy of the fixtures directly determines the consistency and stability of part machining. For parts with external curved surfaces and stepped holes, such as... Figure 1 , Figure 4 As shown, the circular stepped hole 401 on the part 4 to be processed has extremely high requirements for its relative position on the outer circular surface of the part 4 to be processed and for its processing quality accuracy. The processing quality directly affects the sealing performance and assembly reliability of the product.

[0003] In traditional machining methods, parts can only be clamped onto a lathe using a four-jaw chuck. Due to the curved surface structure of the parts, installation is extremely difficult and unstable, posing a risk of parts falling off and making it impossible to guarantee consistent form and position tolerances across the entire batch. After installation, the bottom holes (φ160+0.07mm and φ6mm) need to be repeatedly machined on the curved surface. After machining the bottom holes, the cutting tools are changed, repositioned, and then the steps and threads are machined. Because of the characteristics of the curved surface structure, this machining method requires repeated adjustments and positioning on the curved surface, resulting in low positioning efficiency, large fluctuations in machining accuracy, and a high scrap rate, severely restricting the mass production of high-precision parts. Utility Model Content

[0004] The purpose of this utility model is to solve the technical problem of machining external curved surface stepped hole parts. Due to the characteristics of the external curved surface structure of the parts, the existing machining methods require repeated adjustments and positioning on the external curved surface structure, resulting in low positioning efficiency, large fluctuations in machining accuracy and high scrap rate, which seriously restricts the mass production of high-precision parts. Therefore, this utility model provides a positioning fixture for machining external curved surface stepped holes.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A positioning fixture for machining an external curved circular stepped hole is characterized by comprising a clamping device and a fixture body.

[0007] The tightening device includes a tightening bolt and a tightening block fixedly connected to the lower end of the tightening bolt;

[0008] The tooling body includes a vertical wall, a top wall, and a bottom wall. One side of the top wall along the length direction is connected to the upper end of the vertical wall, and one side of the bottom wall along the length direction is connected to the lower end of the vertical wall.

[0009] The vertical wall is provided with positioning through holes for tool setting of the processing equipment when machining circular stepped holes on the outer curved surface of the part to be processed.

[0010] The top wall is provided with a mounting hole for a clamping device, and a positioning block is provided on the inner wall surface of the top wall. The lower end face of the positioning block has a positioning notch that matches the shape and size of one end of the part to be processed. The center of the positioning block has a through hole, which is coaxially arranged with the mounting hole for the clamping device, and the lower end of the through hole communicates with the positioning notch.

[0011] The tightening bolt passes through the tightening device mounting hole and the through hole in sequence, and is threadedly connected to the tightening device mounting hole. The tightening block is located between the top wall and the bottom wall.

[0012] The inner wall surface of the bottom wall has a positioning groove that matches the shape and size of the other end of the part to be processed.

[0013] Furthermore, the clamping device also includes a locking screw;

[0014] The top of the clamping block has a first threaded hole, and the lower end of the clamping bolt is threadedly connected to the clamping block through the first threaded hole. The peripheral wall of the clamping block has a second threaded hole, and the locking screw passes through the second threaded hole and abuts against the clamping bolt located inside the clamping block to fix the clamping block to the lower end of the clamping bolt.

[0015] Furthermore, the tooling body also includes a connecting block;

[0016] The connecting block has a third threaded hole, the axis of which is collinear with the axis of the mounting hole of the tightening device. The connecting block is fixedly connected to the outer wall surface of the top wall. The tightening bolt passes through the third threaded hole and is connected to the third threaded hole.

[0017] Furthermore, the positioning notch is a hexagonal positioning notch.

[0018] Furthermore, the positioning groove is a circular groove.

[0019] Furthermore, the diameter of the through hole at the center of the positioning block is adapted to the outer diameter of the clamping block, and the clamping block moves axially along the through hole by rotating the clamping bolt.

[0020] Furthermore, if the height of the clamping block is defined as h1 and the height of the positioning block is defined as h2, then h1 and h2 satisfy the following condition: .

[0021] Furthermore, = .

[0022] Furthermore, the vertical wall, top wall, and bottom wall are all rectangular structures.

[0023] Furthermore, the positioning block is fixedly connected to the top wall by bolts; one side of the positioning block has an observation notch for observing the positioning status of the part to be processed.

[0024] The advantages of this utility model compared to the prior art are:

[0025] 1. This utility model discloses a positioning fixture for machining external curved circular stepped holes. The part to be machined is radially positioned by the positioning notch on the top wall and the positioning groove on the bottom wall. A clamping device is set up, and by rotating the clamping bolt, the clamping block presses the part to be machined, thereby achieving axial positioning of the part to be machined. After the part to be machined is stably installed in the positioning fixture for machining external curved circular stepped holes, it is connected to the equipment to be installed through the positioning through hole on the vertical wall. The positioning fixture for machining external curved circular stepped holes has high positioning efficiency, and the installation of the part to be machined is stable, convenient and efficient.

[0026] 2. This utility model provides a positioning fixture for machining circular stepped holes on an outer curved surface. It uses locking screws to fix the top block and the top bolt together. The structure is simple and easy to disassemble and assemble.

[0027] 3. This utility model provides a positioning fixture for machining circular stepped holes on an outer curved surface. By setting a connecting block, the tightening bolt is threadedly connected to the top wall and the connecting block respectively, which increases the reliability of the connection.

[0028] 4. This utility model provides a positioning fixture for machining circular stepped holes on an outer curved surface. By setting a positioning notch on the top wall and a positioning groove on the bottom wall, a dual positioning mode for the part to be measured is achieved, which increases positioning stability and improves the machining accuracy of the part.

[0029] 5. This utility model provides a positioning fixture for machining external curved circular stepped holes. By setting the height of the clamping block to h1 and the height of the positioning block to h2, the following conditions are met: This ensures the accuracy of the positioning notch on the top wall. Attached Figure Description

[0030] Figure 1 A schematic diagram of the outer curved surface circular stepped hole structure of the part to be processed;

[0031] Figure 2 This is a schematic diagram of an embodiment of a positioning fixture for machining a circular stepped hole on an outer curved surface according to the present invention;

[0032] Figure 3 This is a schematic diagram of the clamping device in an embodiment of a positioning fixture for machining an outer curved circular step hole according to this utility model;

[0033] Figure 4This is a schematic diagram of the usage state of a positioning tool for machining an outer curved circular step hole according to an embodiment of the present invention.

[0034] The annotations in the attached figures are explained as follows:

[0035] 1. Tightening device; 101. Tightening bolt; 102. Tightening block; 103. Locking screw; 2. Tooling body; 201. Connecting block; 202. Vertical wall; 203. Positioning through hole; 204. Positioning groove; 3. Positioning block; 4. Part to be processed; 401. Hole to be processed; 5. Four-jaw chuck. Detailed Implementation

[0036] To make the objectives, advantages and features of this utility model clearer, the positioning fixture for machining an outer curved circular step hole proposed by this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figure 2-4 As shown, this utility model addresses the technical problem of machining external curved surface stepped hole parts. Due to the characteristics of the external curved surface structure of the parts, this machining method requires repeated adjustments and positioning on the external curved surface structure, resulting in low positioning efficiency, large fluctuations in machining accuracy, and high scrap rate, which seriously restricts the mass production of high-precision parts. A positioning fixture for machining external curved surface stepped holes is designed, including a clamping device 1 and a fixture body 2.

[0038] The tightening device 1 includes a locking screw 103, a tightening bolt 101, and a tightening block 102 fixedly connected to the lower end of the tightening bolt 101. The top end of the tightening block 102 has a first threaded hole, and the lower end of the tightening bolt 101 is threadedly connected to the tightening block 102 through the first threaded hole. The peripheral wall of the tightening block 102 has a second threaded hole, and the locking screw 103 passes through the second threaded hole and abuts against the tightening bolt 101 located inside the tightening block 102 to fix the tightening block 102 to the lower end of the tightening bolt 101.

[0039] The tooling body 2 includes a connecting block 201, a vertical wall 202, a top wall, and a bottom wall. One side of the top wall along the length direction is connected to the upper end of the vertical wall 202, and one side of the bottom wall along the length direction is connected to the lower end of the vertical wall 202. In this embodiment, the vertical wall 202, the top wall, and the bottom wall are all rectangular structures.

[0040] A positioning through hole 203 is provided on the vertical wall 202 for tool setting of the processing equipment when machining a circular stepped hole on the outer curved surface of the workpiece 4;

[0041] The top wall is provided with mounting holes for a clamping device, and a positioning block is provided on the inner wall surface of the top wall. The positioning block 3 is fixedly connected to the top wall by bolts. Define the height of the clamping block 102 as h1 and the height of the positioning block 3 as h2. Then, h1 and h2 satisfy the following conditions: The lower end face of the positioning block 3 has a positioning notch that matches the shape and size of one end of the part 4 to be processed. In this embodiment, the positioning notch is a hexagonal groove. The center of the positioning block 3 has a through hole, which is coaxially arranged with the mounting hole of the clamping device. The lower end of the through hole communicates with the positioning notch. In this embodiment, the positioning notch is a hexagonal positioning notch, and .

[0042] The tightening bolt 101 passes through the third threaded hole, the tightening device mounting hole and the through hole of the connecting block 201 in sequence, and is connected to the tightening device mounting hole and the third threaded hole respectively. The tightening block 102 is located between the top wall and the bottom wall, and the diameter of the through hole at the center of the positioning block 3 is adapted to the outer diameter of the tightening block 102. The tightening block 102 moves along its axial direction by rotating the tightening bolt 101.

[0043] The inner wall surface of the bottom wall has a positioning groove 204 that matches the shape and size of the other end of the part 4 to be processed. In this embodiment, the positioning groove 204 is a circular groove.

[0044] Clamping process for positioning fixtures used in machining circular stepped holes on external curved surfaces:

[0045] ① Install the positioning through hole 203 onto the positioning protrusion on the four-jaw chuck 5, and use the positioning through hole 203 on the vertical wall of the tooling body 2 to align it so that the tooling body 2 is installed on the four-jaw chuck 5 of the processing equipment.

[0046] ② Install the upper and lower ends of the part to be processed 4 onto the hexagonal positioning notch and the circular groove on the positioning block 3 respectively. Observe the positioning status of the part to be processed 4 through the observation notch on one side of the positioning block 3, so that the end face of the part to be processed 4 fits against the inner wall of the positioning notch of the positioning block 3.

[0047] ③ Tighten the top bolt 101 to press the top block 102 against the part 4 to be processed;

[0048] ④ The cutting tools of the machining equipment are set according to the positioning through hole 203, and the entire stepped hole is machined in one positioning operation.

[0049] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0050] In the description of this utility model, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this utility model.

Claims

1. A positioning fixture for machining a circular stepped hole on an outer curved surface, characterized in that: It includes a clamping device (1) and a tooling body (2); The tightening device (1) includes a tightening bolt (101) and a tightening block (102) fixedly connected to the lower end of the tightening bolt (101). The tooling body (2) includes a vertical wall (202), a top wall and a bottom wall. One side of the top wall along the length direction is connected to the upper end of the vertical wall (202), and one side of the bottom wall along the length direction is connected to the lower end of the vertical wall (202). The vertical wall (202) is provided with a positioning through hole (203) for use by the tool of the processing equipment when machining a circular step hole on the outer curved surface of the part to be processed (4); The top wall is provided with a mounting hole for a clamping device, and a positioning block (3) is provided on the inner wall surface of the top wall. The lower end face of the positioning block (3) has a positioning notch that matches the shape and size of one end of the part to be processed (4). The center of the positioning block (3) has a through hole, which is coaxially arranged with the mounting hole for the clamping device, and the lower end of the through hole is connected to the positioning notch. The tightening bolt (101) passes through the tightening device mounting hole and the through hole in sequence, and is threadedly connected to the tightening device mounting hole. The tightening block (102) is located between the top wall and the bottom wall. The inner wall surface of the bottom wall has a positioning groove (204) that matches the shape and size of the other end of the part to be processed (4).

2. The positioning fixture for machining external curved circular step holes according to claim 1, characterized in that: The clamping device (1) also includes a locking screw (103). The top of the clamping block (102) has a first threaded hole, and the lower end of the clamping bolt (101) is threadedly connected to the clamping block (102) through the first threaded hole. The peripheral wall of the clamping block (102) has a second threaded hole, and the locking screw (103) passes through the second threaded hole and abuts against the clamping bolt (101) located inside the clamping block (102) to fix the clamping block (102) to the lower end of the clamping bolt (101).

3. The positioning fixture for machining external curved surface circular step holes according to claim 1, characterized in that: The tooling body (2) also includes a connecting block (201); The connecting block (201) has a third threaded hole, the axis of the third threaded hole is collinear with the axis of the mounting hole of the tightening device, the connecting block (201) is fixedly connected to the outer wall surface of the top wall, and the tightening bolt (101) passes through the third threaded hole and is connected to the third threaded hole.

4. The positioning fixture for machining external curved surface circular step holes according to claim 1, characterized in that: The positioning notch is a hexagonal positioning notch.

5. The positioning fixture for machining external curved surface circular step holes according to claim 4, characterized in that: The positioning groove (204) is a circular groove.

6. The positioning fixture for machining external curved surface circular step holes according to claim 1, characterized in that: The diameter of the through hole at the center of the positioning block (3) is adapted to the outer diameter of the clamping block (102). By rotating the clamping bolt (101), the clamping block (102) moves along the axial direction of the through hole.

7. The positioning fixture for machining external curved surface circular step holes according to claim 6, characterized in that: Let the height of the clamping block (102) be h1 and the height of the positioning block (3) be h2. Then, h1 and h2 satisfy the following conditions: .

8. The positioning fixture for machining external curved surface circular step holes according to claim 7, characterized in that: = 。 9. The positioning fixture for machining external curved surface circular step holes according to claim 1, characterized in that: The vertical wall (202), top wall, and bottom wall are all rectangular structures.

10. The positioning fixture for machining an external curved surface circular step hole according to claim 1, characterized in that: The positioning block (3) is fixedly connected to the top wall by bolts; one side of the positioning block (3) has an observation notch for observing the positioning status of the part to be processed (4).

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