A positioning fixture for machining thin-walled rotating bodies

Abstract

This utility model discloses a positioning fixture for machining thin-walled rotary bodies, relating to the technical field of machining fixtures for rotary bodies. The positioning fixture includes a mounting component, with a positioning pin structure at its front end. By designing the positioning pin structure in a conical shape and evenly installing multiple sets of protruding strips on its outer peripheral wall, the fixture increases the friction between the pin and the workpiece, supporting and clamping one end of the workpiece. This solves the problem of relative rotation of the part and ensures machining accuracy. Simultaneously, by incorporating two sets of inner wall-adhering arc-shaped plates within the positioning pin structure, the plates, in conjunction with a drive assembly, adhere to both sides of the workpiece's inner wall, further supporting and clamping the workpiece from its inner peripheral wall, increasing the support strength and preventing rotation.

Description

Technical Field

[0001] This utility model relates to the technical field of machining tooling devices for rotating bodies, specifically a positioning tooling for machining thin-walled rotating bodies. Background Technology

[0002] Positioning fixtures for machining thin-walled rotating bodies are specialized process equipment designed to achieve precise positioning and stable clamping of thin-walled, low-rigidity rotating parts during machining. Their core function is to prevent workpiece deformation, displacement, or rotation under cutting forces, gravity, or vibration, thereby ensuring machining accuracy.

[0003] The current common machining method involves pre-drilling positioning holes at both ends of the workpiece, followed by machining using a center-positioning method. However, since the contact points of existing centers are mostly conical structures, when they are clamped to the pre-drilled center holes of the workpiece, the cones are in circular contact with each other, resulting in low friction. This can easily cause relative rotation of the workpiece during machining, thus affecting the machining of high-precision parts. To prevent relative rotation, auxiliary clamping and increased clamping force are usually used. However, increasing auxiliary clamping is limited by the working conditions and is often not feasible. On the other hand, a large clamping force can cause deformation of the workpiece due to its thin wall, which in turn affects the machining accuracy. To address the shortcomings of existing technologies, we propose a positioning fixture for machining thin-walled rotating bodies to solve the above problems. Utility Model Content

[0004] To achieve the above objectives, this utility model provides the following technical solution: a positioning fixture for machining thin-walled rotating bodies, comprising an installation component, a positioning pin structure at the front end of the installation component, the positioning pin structure being fixedly installed to the installation component via an installation assembly, an auxiliary positioning assembly at the front end of the installation component, the auxiliary positioning assembly consisting of a protruding strip and two sets of inner wall-adhering arc plates, the positioning pin structure having a hollow interior, the protruding strip being fixedly installed on the outer peripheral wall of the positioning pin structure and evenly distributed along the outer peripheral wall of the positioning pin structure, the two sets of inner wall-adhering arc plates being disposed inside the positioning pin structure, the two sets of inner wall-adhering arc plates being used to adhere to the inner wall of the workpiece to be machined;

[0005] The mounting assembly is internally equipped with a driving component, which drives two sets of inner wall-adhering arc plates to disengage from the positioning pin structure and slide away from each other. The protruding strip and the two sets of inner wall-adhering arc plates are used to perform auxiliary clamping operations on the workpiece.

[0006] Preferably, the mounting component consists of a power plate and a mounting cylinder, the mounting cylinder being fixedly mounted on the inner wall of the power plate, and the power plate being fixedly connected to an external power device.

[0007] Preferably, the mounting assembly consists of a threaded cylinder and a threaded ring, the threaded cylinder and the threaded ring being connected to the positioning pin structure and the mounting cylinder respectively, and the threaded ring being threadedly connected inside the threaded cylinder.

[0008] Preferably, a first mounting plate is fixedly sleeved on the outer peripheral wall of the mounting cylinder, the threaded cylinder is fixedly installed on the outer wall of the first mounting plate, a second mounting plate is fixedly sleeved on the bottom outer peripheral wall of the positioning pin structure, and the threaded ring is fixedly installed on the outer wall of the second mounting plate.

[0009] Preferably, the drive assembly includes a drive cylinder, a drive rod, a bidirectional cylinder, and a drive plate. A fixing plate is fixedly installed on the inner peripheral wall of the mounting cylinder, and the drive cylinder is fixedly installed on the inner wall of the fixing plate.

[0010] Preferably, the drive plate is attached to the outer wall of the fixed plate, the output end of the drive cylinder is fixedly connected to the drive plate, and the drive rod is fixedly installed on the outer wall of the drive plate.

[0011] Preferably, the bidirectional cylinder is fixedly installed at the end of the drive rod, and the two output ends of the bidirectional cylinder are fixedly connected to the inner walls of the two sets of arc-shaped plates that are respectively close to the inner walls.

[0012] Preferably, the inner peripheral walls on both sides of the mounting cylinder are provided with guide grooves, and guide blocks are slidably connected inside the guide grooves. Guide plates are fixedly installed on the outer walls on both sides of the drive plate, and the guide plates are fixedly connected to the guide blocks.

[0013] This utility model discloses a positioning fixture for machining thin-walled rotating bodies, which has the following beneficial effects: The positioning fixture for machining thin-walled rotating bodies features a conical positioning pin structure with multiple sets of protruding strips evenly installed on its outer peripheral wall. These protruding strips increase the friction between the workpiece and the surrounding surface, supporting and clamping one end of the workpiece, thus solving the problem of relative rotation and ensuring machining accuracy. Simultaneously, two inner-wall-adhering arc-shaped plates are installed inside the positioning pin structure. With the cooperation of the drive assembly, these two sets of inner-wall-adhering arc-shaped plates can detach from the positioning pin structure and slide against each other, allowing them to adhere to both sides of the inner wall of the workpiece. This provides further support and clamping to the workpiece from its inner peripheral wall, increasing the support strength. Furthermore, the outer walls of the two sets of inner-wall-adhering arc-shaped plates are roughened, increasing the contact area and engagement with the workpiece surface, further preventing workpiece rotation. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is an exploded view of the positioning pin structure and mounting components of this utility model;

[0017] Figure 3 This is a schematic diagram of the positioning pin structure of this utility model;

[0018] Figure 4 This is an internal sectional view of the mounting component of this utility model;

[0019] Figure 5 This is a schematic diagram of the connection structure between the inner wall of the curved plate and the drive assembly of this utility model.

[0020] In the diagram: 1. Mounting component; 11. Power plate; 12. Mounting cylinder; 2. Positioning pin structure; 3. Mounting assembly; 31. Threaded cylinder; 311. First mounting plate; 32. Threaded ring; 321. Second mounting plate; 4. Auxiliary positioning assembly; 41. Protruding strip; 42. Inner wall-adhering arc plate; 5. Drive assembly; 51. Drive cylinder; 511. Fixing plate; 52. Drive rod; 53. Two-way cylinder; 54. Drive plate; 541. Guide plate; 542. Guide block; 543. Guide groove. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0023] This utility model discloses a positioning fixture for machining thin-walled rotating bodies.

[0024] According to the appendix Figure 1-5As shown, the system includes an installation component 1, with a positioning pin structure 2 at its front end. The positioning pin structure 2 is fixedly installed to the installation component 1 via an installation assembly 3. An auxiliary positioning assembly 4 is also provided at the front end of the installation component 1. The auxiliary positioning assembly 4 consists of a protruding strip 41 and two sets of inner wall-adhering arc-shaped plates 42. The positioning pin structure 2 has a hollow interior. The protruding strip 41 is fixedly installed on the outer peripheral wall of the positioning pin structure 2 and evenly distributed along its outer periphery. The two sets of inner wall-adhering arc-shaped plates 42 are located inside the positioning pin structure 2, and their outer walls can adhere to the inner wall of the workpiece. During use, an external power unit is fixedly installed with a power plate 11 to drive the connected positioning pin structure. The mechanism 2 moves to one side of the workpiece, causing the positioning pin structure 2 to insert into the inside of the workpiece. This causes multiple sets of protruding strips 41 on the outer peripheral wall of the positioning pin structure 2 to abut against the inner peripheral wall of the workpiece. Thus, the positioning pin structure 2 can support and fix one end of the workpiece. Subsequently, the drive assembly 5 can drive the two sets of inner wall-adhering arc plates 42 to move outside the positioning pin structure 2. The bidirectional cylinder 53 is activated, driving the two sets of inner wall-adhering arc plates 42 to slide away from each other, so that the two sets of inner wall-adhering arc plates 42 are fixedly attached to the inner walls on both sides of the workpiece. Therefore, the two sets of inner wall-adhering arc plates 42 can perform a support and clamping operation from the inner peripheral wall of the workpiece, thereby improving the support and fixation effect of the workpiece and preventing the workpiece from easily rotating during processing.

[0025] See attached document Figure 4-5 The mounting component 3 is equipped with a drive component 5. The drive component 5 drives the two sets of inner wall-adhering arc plates 42 to disengage from the positioning pin structure 2 and slide away from each other. The protruding strips 41 and the two sets of inner wall-adhering arc plates 42 are used to perform auxiliary clamping operations on the workpiece. The positioning pin structure 2 is set into a cone shape, and multiple sets of protruding strips 41 are evenly distributed along the outer peripheral wall of the positioning pin structure 2. Under the condition that the clamping force remains unchanged, the multiple sets of protruding strips 41 can increase the friction of the contact surface, so that the multiple sets of protruding strips 41 can support and clamp one end of the workpiece, thereby solving the problem of relative rotation of the parts and ensuring the machining accuracy of the parts.

[0026] See attached document Figure 2-3The mounting component 1 consists of a power plate 11 and a mounting cylinder 12. The mounting cylinder 12 is fixedly installed on the inner wall of the power plate 11. The power plate 11 is fixedly connected to an external power device. The mounting assembly 3 consists of a threaded cylinder 31 and a threaded ring 32. The threaded cylinder 31 and the threaded ring 32 are respectively connected to the positioning pin structure 2 and the mounting cylinder 12. The threaded ring 32 is threaded inside the threaded cylinder 31. During long-term use, the positioning pin structure 2 is exposed and used frequently. The mounting assembly 3 facilitates the individual disassembly and replacement of the positioning pin structure 2 from the mounting component 1, ensuring the effectiveness of the positioning pin structure 2. By rotating the positioning pin structure 2, the threaded ring 32 at one end of the positioning pin structure 2 is threaded into the threaded cylinder 31. After disengaging it from the inside, the positioning pin structure 2 is lifted and moved to one side, allowing it to detach from one end of the mounting component 1.

[0027] See attached document Figure 2-3 The mounting assembly 3 consists of a threaded cylinder 31 and a threaded ring 32. The threaded cylinder 31 and the threaded ring 32 are respectively connected to the positioning pin structure 2 and the mounting cylinder 12. The threaded ring 32 is threaded inside the threaded cylinder 31. The outer peripheral wall of the mounting cylinder 12 is fixedly sleeved with a first mounting plate 311. The threaded cylinder 31 is fixedly installed on the outer wall of the first mounting plate 311. The bottom outer peripheral wall of the positioning pin structure 2 is fixedly sleeved with a second mounting plate 321. The threaded ring 32 is fixedly installed on the outer wall of the second mounting plate 321. When the two sets of inner walls close to the arc plate 42 are driven to disengage from the inside of the positioning pin structure 2 by the drive assembly 5, the drive cylinder 51 is first activated to push the drive plate 54 and the drive cylinder 52. The moving rod 52 and the bidirectional cylinder 53 slide simultaneously inside the positioning pin structure 2 and the mounting cylinder 12, thereby disengaging the two sets of inner wall-adhering arc plates 42 from inside the positioning pin structure 2. Finally, by activating the bidirectional cylinder 53, the output end of the bidirectional cylinder 53 simultaneously drives the two sets of inner wall-adhering arc plates 42 to slide away from each other, so that the two sets of inner wall-adhering arc plates 42 adhere to both sides of the inner wall of the workpiece, supporting and tightening the workpiece again from the inner peripheral wall of the workpiece, improving the support strength of the workpiece. At the same time, the outer walls of the two sets of inner wall-adhering arc plates 42 are roughened, increasing the contact area and the degree of engagement with the surface of the clamped workpiece, thereby further preventing the workpiece from rotating.

[0028] See attached document Figure 4-5The drive plate 54 is attached to the outer wall of the fixed plate 511. The output end of the drive cylinder 51 is fixedly connected to the drive plate 54. The drive rod 52 is fixedly installed on the outer wall of the drive plate 54. The bidirectional cylinder 53 is fixedly installed at the end of the drive rod 52. The two output ends of the bidirectional cylinder 53 are respectively fixedly connected to the inner walls of the two sets of inner wall-adhering arc plates 42. The drive rod 52 and the drive plate 54 respectively connect the two sets of inner wall-adhering arc plates 42 to the drive cylinder 51. The drive cylinder 51 can drive the two sets of inner wall-adhering arc plates 42 to disengage from the positioning pin structure 2, so that the two sets of inner wall-adhering arc plates 42 can support and clamp the inner wall of the workpiece.

[0029] See attached document Figure 4-5 The inner circumferential walls on both sides of the mounting cylinder 12 are provided with guide grooves 543, and guide blocks 542 are slidably connected inside the guide grooves 543. Guide plates 541 are fixedly installed on the outer walls on both sides of the drive plate 54. The guide plates 541 are fixedly connected to the guide blocks 542. During the process of the bidirectional cylinder 53 being moved by the drive plate 54, the guide blocks 542 at the guide plates 541 at both ends of the drive plate 54 slide inside the guide grooves 543. This component can guide the movement of the bidirectional cylinder 53, so that the bidirectional cylinder 53 will not deviate during the movement. This ensures that the two sets of inner wall-adhering arc plates 42 are equidistant from both sides of the workpiece, so that the two sets of inner wall-adhering arc plates 42 simultaneously contact both sides of the inner wall of the workpiece, thereby improving the quality of the clamping support of the two sets of inner wall-adhering arc plates 42.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A positioning fixture for machining thin-walled rotating bodies, comprising a mounting component (1), wherein a positioning pin structure (2) is provided at the front end of the mounting component (1), characterized in that: The positioning pin structure (2) is fixedly installed with the mounting component (1) through the mounting component (3). The front end of the mounting component (1) is provided with an auxiliary positioning component (4). The auxiliary positioning component (4) is composed of a protruding strip (41) and two sets of inner wall-adhering arc plates (42). The interior of the positioning pin structure (2) is hollow. The protruding strip (41) is fixedly installed on the outer peripheral wall of the positioning pin structure (2) and is evenly distributed along the outer peripheral wall of the positioning pin structure (2). The two sets of inner wall-adhering arc plates (42) are set inside the positioning pin structure (2). The two sets of inner wall-adhering arc plates (42) are used to adhere to the inner wall of the workpiece to be processed. The mounting component (3) is provided with a drive component (5). The drive component (5) is used to drive the two sets of inner wall-adhering arc plates (42) to move out of the positioning pin structure (2) and slide away from each other. The protruding strip (41) and the two sets of inner wall-adhering arc plates (42) are used to perform auxiliary clamping operations on the workpiece.

2. The positioning fixture for machining thin-walled rotating bodies according to claim 1, characterized in that: The mounting component (1) consists of a power plate (11) and a mounting cylinder (12). The mounting cylinder (12) is fixedly mounted on the power plate (11), and the power plate (11) is fixedly connected to an external power device.

3. A positioning fixture for machining thin-walled rotating bodies according to claim 2, characterized in that: The mounting assembly (3) consists of a threaded cylinder (31) and a threaded ring (32). The threaded cylinder (31) and the threaded ring (32) are respectively connected to the positioning pin structure (2) and the mounting cylinder (12). The threaded ring (32) is threaded inside the threaded cylinder (31).

4. A positioning fixture for machining thin-walled rotating bodies according to claim 3, characterized in that: The outer peripheral wall of the mounting cylinder (12) is fixedly sleeved with a first mounting plate (311), the threaded cylinder (31) is fixedly installed on the outer wall of the first mounting plate (311), the bottom outer peripheral wall of the positioning pin structure (2) is fixedly sleeved with a second mounting plate (321), and the threaded ring (32) is fixedly installed on the outer wall of the second mounting plate (321).

5. A positioning fixture for machining thin-walled rotating bodies according to claim 2, characterized in that: The drive assembly (5) includes a drive cylinder (51), a drive rod (52), a two-way cylinder (53) and a drive plate (54). A fixing plate (511) is fixedly installed on the inner peripheral wall of the mounting cylinder (12), and the drive cylinder (51) is fixedly installed on the fixing plate (511).

6. A positioning fixture for machining thin-walled rotating bodies according to claim 5, characterized in that: The drive plate (54) is attached to the fixed plate (511), the output end of the drive cylinder (51) is fixedly connected to the drive plate (54), and the drive rod (52) is fixedly installed on the outer wall of the drive plate (54).

7. A positioning fixture for machining thin-walled rotating bodies according to claim 6, characterized in that: The bidirectional cylinder (53) is fixedly installed at the end of the drive rod (52), and the two output ends of the bidirectional cylinder (53) are fixedly connected to the inner walls of the two sets of arc plates (42) that are respectively attached to the inner walls.

8. A positioning fixture for machining thin-walled rotating bodies according to claim 5, characterized in that: The inner peripheral walls on both sides of the mounting cylinder (12) are provided with guide grooves (543), and guide blocks (542) are slidably connected inside the guide grooves (543). Guide plates (541) are fixedly installed on the outer walls on both sides of the drive plate (54), and the guide plates (541) are fixedly connected to the guide blocks (542).

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