A special fixture for machining a front fork sleeve of a motorcycle

Abstract

The utility model relates to the field of machining fixture, especially motorcycle parts machining fixture, in particular to motorcycle front fork sleeve processing vertical -lathe special fixture, solve the existing thin -walled sleeve clamping deformation problem and the problem that positioning is not tight, easy to loosen, realize quick positioning clamping, including chuck and two clamping jaws, the top surface of two clamping jaws is correspondingly provided with left support vertical plate and right support vertical plate, the upper portion and the lower portion of left support vertical plate are equipped with left upper profiling block, left lower profiling block respectively, the upper portion and the lower portion of right support vertical plate are equipped with right upper profiling block, right lower profiling block respectively, the surface of left lower profiling block and right lower profiling block is equipped with the lower positioning groove that accords with the main cylinder lower part outer wall of front fork sleeve, the surface of left upper profiling block is equipped with the left positioning groove that accords with the steering shaft outer wall of front fork sleeve, the surface of right upper profiling block is equipped with the right positioning groove that accords with the main cylinder upper part outer wall of front fork sleeve.

Description

Technical Field

[0001] This utility model relates to the field of machining fixtures, and in particular to machining fixtures for motorcycle parts, specifically a special fixture for machining motorcycle front fork sleeves. Background Technology

[0002] Currently, motorcycle front fork sleeves are thin-walled cylindrical parts, such as Figure 1 As shown, it mainly includes a main cylinder body, and a steering shaft is also provided on the upper outer side of the main cylinder body. The steering shaft is orthogonal to the axis of the main cylinder body in space. During machining, this fork sleeve part needs to be clamped by a chuck fixture. The general method is to clamp the outer wall of the fork sleeve with a three-jaw chuck.

[0003] However, traditional three-jaw chuck clamping is prone to deformation, affecting coaxiality and wall thickness uniformity. Furthermore, existing general-purpose fixtures lack positioning references for the fork sleeve structure, which can easily cause radial runout errors during machining. Machining deformation and vibration are also common. Since the wall thickness of the lower part of the sleeve blank is about 5mm, if excessive clamping force is applied to ensure a firm grip, a deformation of 0.1~0.15mm will occur when the fixture is released after machining. Utility Model Content

[0004] This utility model provides a special clamp for machining motorcycle front fork sleeves, which solves the problems of deformation during clamping of thin-walled sleeves, as well as the problems of loose positioning and easy loosening, and achieves rapid positioning and clamping.

[0005] This utility model is achieved through the following technical solution: A special fixture for machining motorcycle front fork sleeves includes a chuck and two jaws. The two jaws are mounted on the chuck and can move back and forth along the radial direction of the chuck. The two jaws are symmetrically arranged on the left and right. The top surfaces of the two claws are respectively provided with a left support plate and a right support plate. The upper and lower parts of the left support plate are respectively provided with an upper left contour block and a lower left contour block, and the upper and lower parts of the right support plate are respectively provided with an upper right contour block and a lower right contour block. The surfaces of the lower left and lower right contour blocks are provided with lower positioning grooves that fit with the lower outer wall of the main body of the fork sleeve; The surface of the upper left contour block is provided with a left positioning groove that fits with the outer wall of the steering shaft of the front fork sleeve, and the surface of the upper right contour block is provided with a right positioning groove that fits with the upper outer wall of the main body of the front fork sleeve.

[0006] Furthermore, the lower positioning grooves of the lower left and lower right contour blocks and the right positioning groove of the upper right contour block are all vertically distributed V-shaped grooves, and the left positioning groove of the upper left contour block is a horizontally distributed V-shaped groove.

[0007] Furthermore, the surface of the V-groove is an arc-shaped surface with an angle of 40°-50°.

[0008] Furthermore, the upper left contour block and the lower left contour block are detachably fixed to the left support plate by bolt assemblies, and the upper right contour block and the lower right contour block are detachably fixed to the right support plate by bolt assemblies.

[0009] Furthermore, right-angle support blocks are fixed to the back of both the left and right support plates by bolt assemblies, and the right-angle support blocks are fixed to the top surface of the claw by bolt assemblies.

[0010] Furthermore, dynamic balancing blocks are provided between the lower left contour block and the corresponding jaw, and between the lower right contour block and the corresponding jaw.

[0011] Furthermore, the chuck is provided with a slide rail, and the bottom surface of the chuck claw is provided with a slider that slides in cooperation with the slide rail.

[0012] The beneficial effects achieved by this utility model compared with the prior art are as follows: 1. Place the fork sleeve between the left and right support plates. As the two jaws move towards each other, the left positioning groove of the upper left contour block is engaged with the steering shaft of the fork sleeve, the right positioning groove of the upper right contour block is engaged with the upper part of the outer wall of the fork sleeve, and the lower positioning grooves of the lower left and lower right contour blocks are engaged with the lower outer wall of the main body of the fork sleeve. With the steering shaft as the positioning reference, the fork sleeve is quickly positioned. Multiple points are clamped simultaneously, the positioning is accurate and the clamping is firm, avoiding the deformation, coaxiality and wall thickness uniformity that are easily caused by traditional three-jaw chuck clamping. 2. This utility model greatly improves the machining accuracy by clamping the contour block, reducing the coaxiality and roundness from 0.15MM in traditional fixtures to within 0.03MM; Efficiency improved; processing time optimized by 30%, single clamping reduced manual labor intensity, and lowered the risk of workplace injuries; 3. The surface of the V-groove is arc-shaped, which increases the contact area for clamping and avoids the problem of local extrusion deformation, making it very suitable for clamping thin-walled sleeve-type workpieces. 4. The upper left and lower left contour blocks are detachably fixed to the left support plate by bolt assemblies, and the upper right and lower right contour blocks are detachably fixed to the right support plate by bolt assemblies. Different types of contour blocks can be replaced, improving the compatibility of the clamp and covering 80% of motorcycle fork sleeve models. 5. This utility model has a cost advantage, reduces the defect rate by about 15%, and has a fixture life of ≥50,000 cycles. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a motorcycle front fork sleeve in the prior art; Figure 2 This is a three-dimensional schematic diagram of the special fixture for machining motorcycle front fork sleeves according to the present invention. Figure 3 This is a three-dimensional schematic diagram of the left and right support plates of this utility model; Figure 4 This is a schematic diagram showing the usage of the special fixture for machining motorcycle front fork sleeves according to this utility model. In the diagram: 1. Chuck, 2. Claw, 3. Left support plate, 4. Right support plate, 5. Upper left contour block, 6. Lower left contour block, 7. Upper right contour block, 8. Lower right contour block, 9. Lower positioning groove, 10. Left positioning groove, 11. Right positioning groove, 12. Right angle support block, 13. Dynamic balancing block. Detailed Implementation

[0014] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0015] In the description of the utility model, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model 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. Therefore, they should not be construed as limitations on the utility model.

[0016] Motorcycle fork sleeves are thin-walled cylindrical parts. During machining, these parts need to be clamped using a chuck fixture, typically a three-jaw chuck. A three-jaw chuck is a common machining tool, as exemplified by the multi-purpose three-jaw chuck disclosed in prior art (CN106216725B). However, traditional three-jaw chuck clamping easily leads to deformation, affecting coaxiality and wall thickness uniformity. Furthermore, existing general-purpose fixtures lack a positioning reference specific to the fork sleeve structure, making radial runout errors, machining deformation, and vibration common during processing. To address this problem, this invention provides a dedicated vertical fixture for machining motorcycle fork sleeves.

[0017] Example 1 like Figure 2-3As shown, this embodiment discloses a special fixture for machining motorcycle front fork sleeves, including a chuck 1, two jaws 2, a left support plate 3, a right support plate 4, and a right-angle support block 12. A slide rail is provided on the chuck 1, and a slider that slides along the slide rail is installed on the bottom surface of the jaws 2. The two jaws 2 are symmetrically arranged. This design allows the two jaws 2 to be mounted on the chuck 1 and to move back and forth radially along the chuck 1. A connecting rod is installed at the bottom of the chuck 1, which connects to a conventional machine tool.

[0018] The top surfaces of the two claws 2 are respectively fitted with the left support plate 3 and the right support plate 4. In order to ensure the stability of the left support plate 3 and the right support plate 4, the right-angle support block 12 is fixed on the back of the left support plate 3 and the right support plate 4 by bolt assembly. Then the bottom of the right-angle support block 12 is fixed to the top surface of the claw 2 by bolt assembly.

[0019] Left upper contour block 5 and left lower contour block 6 are installed on the upper and lower parts of the front of the left support plate 3, respectively. Right upper contour block 7 and right lower contour block 8 are installed on the upper and lower parts of the front of the right support plate 4, respectively. It is worth noting that the left upper contour block 5, left lower contour block 6, right upper contour block 7, and right lower contour block 8 need to be designed according to different specifications and models of motorcycle front fork sleeves. Therefore, it is necessary to ensure that the left upper contour block 5, left lower contour block 6, right upper contour block 7, and right lower contour block 8 can be easily disassembled and replaced. For this purpose, the left upper contour block 5 and left lower contour block 6 are detachably fixed to the left support plate 3 using bolt assemblies, and the right upper contour block 7 and right lower contour block 8 are detachably fixed to the right support plate 4 using bolt assemblies. This design allows for adjustment of the spacing and specifications of the vertically distributed contour blocks according to the actual product specifications. The lower left and lower right contour blocks 6 and 8 are machined with lower positioning grooves 9 that fit with the lower outer wall of the main body of the fork sleeve; the upper left contour block 5 is machined with a left positioning groove 10 that fits with the outer wall of the steering shaft of the fork sleeve; and the upper right contour block 7 is machined with a right positioning groove 11 that fits with the upper outer wall of the main body of the fork sleeve. Since the main function of the lower left, lower right, and upper right contour blocks 6, 8, and 7 is to clamp the main body of the fork sleeve, the lower positioning grooves 9 of the lower left and lower right contour blocks 6 and 8, and the right positioning groove 11 of the upper right contour block 7 are all vertically distributed V-shaped grooves; since the main function of the upper left contour block 5 is to clamp the steering shaft of the fork sleeve, the left positioning groove 10 of the upper left contour block 5 is designed as a horizontally distributed V-shaped groove, with the angle of the V-shaped groove designed to be between 40° and 50°. In this embodiment, the V-shaped groove of the upper left contour block 5 is 42°. The steering shaft of the fork sleeve and the outer wall of the main body are both cylindrical. Therefore, the surface of the V-groove is designed as an arc surface to increase the contact area during clamping. The contact area is controlled at 400 mm² to avoid damage to the parts.

[0020] The working principle of the motorcycle front fork sleeve machining vertical jig described in this embodiment is as follows: like Figure 4 As shown, firstly, the entire device is installed on the machine tool. The fork sleeve to be processed is placed between the left and right support plates. As the two jaws move towards each other, the left positioning groove of the upper left contour block engages with the steering shaft of the fork sleeve, thus fixing the sleeve blank in the Z-axis direction. The right positioning groove of the upper right contour block engages with the upper part of the outer wall of the fork sleeve, and the lower positioning grooves of the lower left and lower right contour blocks engage with the lower outer wall of the main body of the fork sleeve. Using the steering shaft as the positioning reference, the fork sleeve is quickly positioned, and multiple points are clamped simultaneously. This greatly improves the positioning accuracy and ensures firm clamping, avoiding the deformation, coaxiality, and wall thickness uniformity issues that are easily caused by traditional three-jaw chuck clamping.

[0021] Example 2 This embodiment discloses a special fixture for machining motorcycle front fork sleeves. Most of its structure is the same as in Embodiment 1, with further optimizations, such as... Figure 2 As shown, dynamic balancing blocks 13 are installed between the lower left contour block 6 and the corresponding jaw 2, and between the lower right contour block 8 and the corresponding jaw 2. The dynamic balancing blocks 13 can improve the stability of the lower left contour block 6 and the lower right contour block 8, and can limit the movement of the lower left contour block 6 and the lower right contour block 8.

Claims

1. A special fixture for machining motorcycle front fork sleeves, comprising a chuck (1) and two jaws (2), characterized in that, Two jaws (2) are mounted on the chuck (1) and can move back and forth along the radial direction of the chuck (1). The two jaws (2) are arranged symmetrically on the left and right. The top surfaces of the two claws (2) are respectively provided with a left support plate (3) and a right support plate (4). The upper and lower parts of the left support plate (3) are respectively provided with an upper left contour block (5) and a lower left contour block (6). The upper and lower parts of the right support plate (4) are respectively provided with an upper right contour block (7) and a lower right contour block (8). The surfaces of the lower left contour block (6) and the lower right contour block (8) are provided with lower positioning grooves (9) that fit with the lower outer wall of the main body of the fork sleeve. The surface of the upper left contour block (5) is provided with a left positioning groove (10) that fits with the outer wall of the steering shaft of the fork sleeve, and the surface of the upper right contour block (7) is provided with a right positioning groove (11) that fits with the upper outer wall of the main body of the fork sleeve.

2. The special fixture for machining motorcycle front fork sleeves according to claim 1, characterized in that, The lower positioning grooves (9) of the lower left contour block (6) and the lower right contour block (8) and the right positioning groove (11) of the upper right contour block (7) are all vertically distributed V-shaped grooves, and the left positioning groove (10) of the upper left contour block (5) is a horizontally distributed V-shaped groove.

3. The special fixture for machining motorcycle front fork sleeves according to claim 2, characterized in that, The surface of the V-groove is an arc-shaped surface with an angle of 40°-50°.

4. The special fixture for machining motorcycle front fork sleeves according to claim 1, characterized in that, The upper left contour block (5) and the lower left contour block (6) are detachably fixed to the left support plate (3) by bolt assembly, and the upper right contour block (7) and the lower right contour block (8) are detachably fixed to the right support plate (4) by bolt assembly.

5. The special fixture for machining motorcycle front fork sleeves according to claim 1, characterized in that, The back of both the left support plate (3) and the right support plate (4) are fixed with right-angle support blocks (12) by bolt assemblies. The right-angle support blocks (12) are fixed to the top surface of the claw (2) by bolt assemblies.

6. The special fixture for machining motorcycle front fork sleeves according to claim 5, characterized in that, Dynamic balancing blocks (13) are provided between the lower left contour block (6) and the corresponding jaw (2) and between the lower right contour block (8) and the corresponding jaw (2).

7. The special fixture for machining motorcycle front fork sleeves according to any one of claims 1-6, characterized in that, The chuck (1) is provided with a slide rail, and the bottom surface of the jaw (2) is provided with a slider that slides in cooperation with the slide rail.

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