A front fork shoulder cover forging blank flash cutting die

Abstract

The utility model relates to the field of bicycle parts forging, especially to the field of front fork shoulder cover forging blank, concretely relates to a front fork shoulder cover forging blank flash cutting die, including upper die plate and die holder, the upper die plate is located the top of die holder and can move up and down, the bottom surface of upper die plate is installed with punch, the bottom surface of punch is the C concave surface that accords with the broken line profile of front fork shoulder cover forging blank top surface, three positioning bosses are equipped on the C concave surface along the length direction, three positioning bosses can correspondingly embed in three pipe holes of front fork shoulder cover forging blank, the top of die holder is connected with mould core, the top of mould core is the C convex surface that accords with the curve profile of front fork shoulder cover forging blank bottom surface, the C convex surface is equipped with the trimming port that penetrates mould core, the die holder is equipped with blanking channel that communicates trimming port.

Description

Technical Field

[0001] This utility model relates to the field of bicycle parts forging, and in particular to the field of forging blanks for fork shoulder caps, specifically to a die for removing flash from fork shoulder cap forging blanks. Background Technology

[0002] The fork shoulder cover is an important component of a bicycle, such as Figure 1 As shown, its shape is roughly C-shaped, with three holes on top. The middle hole is for mounting the handlebar link, and the holes on the left and right sides are for mounting the fork links. This part is usually manufactured using a forging process.

[0003] like Figure 2 As shown, after forging, the final forging of the fork shoulder cap has flash. Flash is often removed by machining, but this method is wasteful of manpower and resources and is extremely inefficient. To solve this problem, we designed a trimming die for removing the flash from the fork shoulder cap forging blank. This die mainly consists of a punch and a die base. The punch is located above the die base, and a die core is designed on the die base. The flash is removed by pressing down. However, the following drawbacks exist: 1. Placing the forging blank in the die core is done manually. Since the bottom surface of the fork shoulder cap is C-shaped, the position of the forging blank cannot be effectively controlled during the pressing process, resulting in uneven flash residue around the forging and scratches on the forging surface. 2. The original trimming die base uses a one-piece design, with each trimming die corresponding to one product, resulting in poor compatibility. Utility Model Content

[0004] This utility model provides a flash removal die for a fork shoulder cover forging blank, which solves the problem that the position of the forging blank cannot be effectively controlled during the pressing and cutting process in the prior art. The forging blank can be positioned by the positioning boss, thereby improving the quality of flash removal.

[0005] This utility model is achieved through the following technical solution: A flash trimming die for a fork shoulder cover forging includes an upper template and a die base. The upper template is located above the die base and can move up and down relative to it. A punch is mounted on the bottom surface of the upper template. The bottom surface of the punch is a C-shaped concave surface that matches the folded contour of the top surface of the fork shoulder cover forging blank. Three positioning bosses are provided on the C-shaped concave surface along the length direction. The three positioning bosses can be correspondingly embedded into the three tube holes of the fork shoulder cover forging blank. The top surface of the mold base is connected to a mold core. The top surface of the mold core is a C-shaped convex surface that matches the curve contour of the bottom surface of the fork shoulder cover forging blank. The C-shaped convex surface is provided with a cutting edge that runs through the mold core from top to bottom. The mold base is provided with a blanking channel that connects to the cutting edge.

[0006] Furthermore, a punch is detachably mounted on the bottom surface of the upper template, and a mold core is detachably connected to the top surface of the mold base.

[0007] Furthermore, the bottom surface of the upper template is connected to multiple guide pillars, and the mold base is provided with guide holes corresponding to the guide pillars; The bottom surface of the upper template is fitted with an upper mold pad by bolt assembly. The bottom surface of the upper mold pad is provided with an upper mold groove. The top end of the punch is fixed in the upper mold groove by bolt assembly.

[0008] Furthermore, the top surface of the mold base is provided with a lower mold groove, and the mold core is fixed in the lower mold groove by a bolt assembly.

[0009] Furthermore, pads are provided on the left and right sides of the bottom surface of the mold base, and the bottom surface of the pads is connected to the lower template.

[0010] Furthermore, the top surface of the upper template is provided with a mold handle.

[0011] The beneficial effects achieved by this utility model compared with the prior art are as follows: 1. Three positioning bosses are provided along the length of the C-shaped concave surface of the punch. The three positioning bosses can be inserted into the three tube holes of the fork shoulder cover forging blank. With this design, when the punch is pressed down, the forging blank is positioned by the three positioning bosses engaging with the three tube holes of the forging blank. This makes the residual flash on the forging blank after trimming more uniform, effectively reduces surface scratches to reduce grinding costs, and improves product yield. 2. The bottom surface of the upper template is detachably equipped with a punch, and the top surface of the mold base is detachably connected with a mold core. The mold core can be replaced at will according to different product shapes. The mold base can be used continuously as a common part. The mold height can be adjusted in time by replacing the pads, making mold assembly and disassembly more flexible. 3. Compared with the original mold, the one-piece mold base needs to be made of a single piece of high-strength material, which is more expensive. In this utility model, the mold core is designed to be disassembled, so only the mold core needs to be made of high-strength material. The mold base, pad block and template can be made of inexpensive ordinary steel, which greatly reduces the material and manufacturing costs. 4. The bottom surface of the upper mold plate is connected to multiple guide pillars, and the mold base is provided with guide holes corresponding to the guide pillars, which are used to guide the mold and prevent the upper and lower molds from shifting when the mold is closed. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a front fork shoulder cover in the prior art; Figure 2 This is a schematic diagram of a forging billet in the prior art; Figure 3 This is a schematic diagram of the overall die for removing flash from the fork shoulder cap forging blank according to this utility model; Figure 4 This is a schematic diagram of the overall punch of the present invention; Figure 5 This is a schematic diagram of the bottom surface of the punch described in this utility model; Figure 6 This is an exploded view of the mold core and mold base described in this utility model; In the diagram: 1. Upper template, 11. Guide post, 2. Mold base, 21. Blanking channel, 22. Lower mold groove, 3. Punch, 31. C-shaped concave surface, 32. Positioning boss, 4. Mold core, 41. C-shaped convex surface, 42. Cutting edge, 5. Upper mold pad, 6. Pad block, 7. Lower template, 8. Mold handle. Detailed Implementation

[0013] 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.

[0014] 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.

[0015] The fork shoulder cover forging blank mentioned in this application is a forging part of the fork shoulder cover in a bicycle (hereinafter referred to as forging blank for ease of description). The bottom outer periphery of the forging blank will have flash, which needs to be removed.

[0016] Example 1 This embodiment discloses a flash trimming die for a fork shoulder cover forging. It requires a punch press for use. A punch press is a conventional hydraulic device that typically includes a lifting end for pressing operations. (See reference...) Figures 3-5 The fork shoulder cover forging blank flash removal mold described in this embodiment mainly includes an upper template 1, a mold base 2, a punch 3, a mold core 4, a pad block 6, and a lower template 7.

[0017] The upper template 1 is a rectangular steel plate. A mold handle 8 is fixed to the top surface of the upper template 1 with screws. The upper template 1 is connected to the lifting end above the punch press worktable via the mold handle 8. Multiple guide pillars 11 are installed on the bottom surface of the upper template 1. The guide pillars 11 are used to guide the mold and prevent the upper and lower molds from shifting when the mold is closed. In this design, four guide pillars 11 are sufficient. An upper mold pad 5 is installed on the bottom surface of the upper template 1 via bolt assembly, and a punch 3 is installed on the bottom surface of the upper mold pad 5. The punch 3 is a vertical plate structure and is made of conventional punch material. The bottom surface of the punch 3 is machined into a C-shaped concave surface 31 that matches the contour of the top surface of the fork shoulder cover forging blank. Three positioning bosses 32 are machined along the length direction on the C-shaped concave surface 31. The positioning bosses 32 are cylindrical and can be inserted into the three tube holes of the fork shoulder cover forging blank. It is worth noting that, because the forging blanks have different specifications, the C-shaped concave surface 31 and the positioning boss 32 of the punch 3 are customized according to the specifications and dimensions of the forging blanks. When processing forging blanks of different specifications in large quantities, the punch 3 needs to be replaced.

[0018] The die core 4 needs to be mounted on the top surface of the die base 2. The top surface of the die core 4 is machined into a C-shaped convex surface 41 that matches the curve contour of the bottom surface of the fork shoulder cover forging blank. The C-shaped convex surface 41 of the die core 4 is also customized according to the specifications and dimensions of the forging blank. A cutting edge 42 is machined on the C-shaped convex surface 41, which runs vertically through the die core 4. The cutting edge 42 allows the forging blank after removing the flash to pass through. A blanking channel 21 is machined on the die base 2 to connect the cutting edge 42. In order to facilitate the removal of the forging blank from below the die base 2, pads 6 are installed on the left and right sides of the bottom surface of the die base 2 by bolt assemblies. The two pads 6 are located on the left and right sides of the blanking channel 21, which makes it convenient for the operator to remove the forging blank. A lower template 7 is connected to the bottom surface of the pads 6 by bolt assemblies, and the lower template 7 is fixed to the working platform of the punch press.

[0019] The working process of the fork shoulder cap forging blank flash removal die described in this embodiment is as follows: First, the flash trimming die for the fork shoulder cover forging blank is installed on the punch press, allowing the punch to move up and down relative to the die core. The operator places the forging blank on the C-shaped convex surface of the die core for initial positioning. As the punch presses down, the three positioning bosses on the C-shaped concave surface first embed into the three tube holes of the forging blank, thus positioning the forging blank. As the punch continues to press down, it pushes the forging blank downwards, and the trimming edge removes the flash. The forging blank after the flash is removed enters the blanking channel through the trimming edge and finally falls between the two pads. The operator then removes the forging blank.

[0020] The above solution makes the residual flash on the forging blank after trimming more uniform, effectively reduces surface scratches to lower grinding costs, and improves product yield.

[0021] Example 2 This embodiment discloses a flash trimming die for a fork shoulder cover forging. Unlike Embodiment 1, an upper die groove is provided on the bottom surface of the upper die pad 5, and the top of the punch 3 is fixed in the upper die groove by a bolt assembly. A lower die groove 22 is machined on the top surface of the die base 2, and the die core 4 is fixed in the lower die groove 22 by a bolt assembly. The die core 4 and punch 3 can be replaced with corresponding specifications at any time to process forging blanks of different specifications. Furthermore, the die core is made of high-strength metal, while the die base can be made of ordinary steel. Compared with the original die, the one-piece die base requires the use of a single piece of high-strength material, resulting in higher costs. In this invention, the detachable die core design requires only the die core to be made of high-strength material; the die base, pad, and template can use inexpensive ordinary steel, significantly reducing material and manufacturing costs.

Claims

1. A front fork crown forging flash trimming die characterized by, It includes an upper template (1) and a mold base (2). The upper template (1) is located above the mold base (2) and can move up and down relative to it. A punch (3) is installed on the bottom surface of the upper template (1). The bottom surface of the punch (3) is a C-shaped concave surface (31) that matches the folded outline of the top surface of the fork shoulder cover forging blank. Three positioning bosses (32) are provided on the C-shaped concave surface (31) along the length direction. The three positioning bosses (32) can be correspondingly embedded into the three tube holes of the fork shoulder cover forging blank. The top surface of the mold base (2) is connected to the mold core (4). The top surface of the mold core (4) is a C-shaped convex surface (41) that matches the curve contour of the bottom surface of the fork shoulder cover forging blank. The C-shaped convex surface (41) is provided with a cutting edge (42) that runs through the mold core (4) from top to bottom. The mold base (2) is provided with a blanking channel (21) that connects to the cutting edge (42).

2. The fork crown swage flash trim die of claim 1, wherein, The bottom surface of the upper template (1) is detachably equipped with a punch (3), and the top surface of the mold base (2) is detachably connected with a mold core (4).

3. The flash trimming die for the fork shoulder cap forging blank according to claim 2, characterized in that, The bottom surface of the upper template (1) is connected to multiple guide pillars (11), and the mold base (2) is provided with guide holes corresponding to the guide pillars (11); The bottom surface of the upper template (1) is fitted with an upper mold pad (5) by a bolt assembly. The bottom surface of the upper mold pad (5) is provided with an upper mold groove. The top end of the punch (3) is fixed in the upper mold groove by a bolt assembly.

4. The flash trimming die for the fork shoulder cap forging blank according to claim 3, characterized in that, The top surface of the mold base (2) is provided with a lower mold groove (22), and the mold core (4) is fixed in the lower mold groove (22) by a bolt assembly.

5. The flash trimming die for the fork shoulder cap forging blank according to any one of claims 1-4, characterized in that, The bottom surface of the mold base (2) is provided with pads (6) on the left and right sides respectively, and the bottom surface of the pads (6) is connected to the lower template (7).

6. The flash trimming die for the fork shoulder cap forging blank according to any one of claims 1-4, characterized in that, The top surface of the upper template (1) is provided with a mold handle (8).

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