Mountain bike crank forging and pressing die

Abstract

The utility model provides a mountain bike crank forging die, and relates to the field of forging dies. Comprising an upper die and a lower die, a die cavity is formed in the lower die, the depth of the die cavity is more than two times larger than the thickness of a produced crank, a forging and pressing head matched with the die cavity is arranged at the bottom of the upper die, a hole die column and a groove die block are arranged at the bottom of the forging and pressing head, and a groove die plate corresponding to the groove die block is arranged in the die cavity. The groove mold plate is connected with the lower mold in a sliding mode and provided with a lifting assembly. The crank forging and pressing die solves the problem that when an existing crank forging and pressing die conducts forging and pressing forming on a crank, a worker needs to control a blank aside to prevent the blank from being misplaced, and operation is inconvenient.

Description

Technical Field

[0001] The utility model provides a forging die for a mountain bike crank, which relates to the field of forging dies. Background Art

[0002] A bike crank is an important component connecting the bike pedal and the bottom bracket spindle, responsible for transmitting the rider's pedal force to the transmission system. The crank is generally made of materials such as aluminum alloy, steel or carbon fiber, and is designed with a certain bend to adapt to the natural movement trajectory of the pedal.

[0003] During the manufacturing process of the crank, the first step is to put the blank into the forging die for preliminary forging and forming, and then carry out subsequent fine processing. For the lower die of the existing crank forging die, the die cavity is relatively shallow. When the upper die presses down multiple times, due to the large impact force, the blank vibrates, and it is necessary for the staff to control the blank beside to prevent it from being misaligned, which is not very convenient to operate. And a deeper die cavity is not convenient for taking out the crank. Therefore, we propose a forging die for a mountain bike crank. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is that when the existing crank forging die is used to forge and form the crank, it is necessary for the staff to control the blank beside to prevent it from being misaligned, resulting in inconvenient operation.

[0005] To solve the above technical problem, the technical solution provided by the utility model is: a forging die for a mountain bike crank, including an upper die and a lower die. A die cavity is provided on the lower die, and the depth of the die cavity is more than twice the thickness of the produced crank. A forging head matching the die cavity is provided at the bottom of the upper die. A hole die column and a groove module are provided at the bottom of the forging head. A groove template corresponding to the groove module is provided in the die cavity. The groove template is slidably connected to the lower die and is provided with a lifting assembly.

[0006] Preferably, the lifting assembly includes a sliding groove opened at the bottom of the die cavity and matching the groove template, a through hole communicated with the sliding groove, lifting rods symmetrically fixed on the side walls of the groove template, and a lifting plate fixed on the outer wall of the lower die. The lifting rods penetrate through the through holes and a hydraulic cylinder is fixed between the lifting rods and the lifting plate.

[0007] Preferably, a hole position matching the hole die column is opened in the die cavity.

[0008] Preferably, the top of the groove template has the same shape as the groove module. The top end of the groove template extends out of the sliding groove, and the extended height is the same as the thickness of the groove module.

[0009] Preferably, chip removal grooves communicated with the hole positions are opened on both sides of the lower die, and the bottom surface of the chip removal grooves is inclined.

[0010] Preferably, a guiding groove is formed inside the sliding groove, and a guiding block which is fixedly connected to the side wall of the groove template and slidably placed inside the guiding groove is provided.

[0011] The beneficial effects of the present utility model:

[0012] By providing a deep die cavity, when the blank is placed in the die cavity, it is directly limited by the die cavity, and there is no need for the staff to manually adjust during the forging process. At the same time, through the setting of the lifting component, the crank can be ejected after forging, which is convenient for demoulding. Description of the drawings

[0013] Figure 1 It is a schematic diagram of the overall structure of a forging die for a mountain bike crank of the present utility model.

[0014] Figure 2 It is an exploded view of a forging die for a mountain bike crank of the present utility model.

[0015] Figure 3 It is a top view of the lower die of a forging die for a mountain bike crank of the present utility model.

[0016] Figure 4 It is a schematic diagram of the structure of the lower die of a forging die for a mountain bike crank of the present utility model.

[0017] (1. Upper die; 2. Lower die; 3. Chip removal groove; 4. Lifting rod; 5. Hydraulic cylinder; 6. Die cavity; 7. Hole die column; 8. Groove module; 9. Hole position; 10. Sliding groove; 11. Groove template; 12. Guiding groove; 13. Guiding block; 14. Through hole; 15. Lifting plate; 16. Forging head) Specific embodiments

[0018] Next, the preferred embodiments of the present utility model will be described in detail with reference to the drawings.

[0019] Referring to Figures 1 to 4 , the present utility model provides a forging die for a mountain bike crank, including an upper die 1 and a lower die 2. A die cavity 6 is provided on the lower die 2, and the depth of the die cavity 6 is more than twice the thickness of the produced crank. By providing the deep die cavity 6, when the blank is placed in the die cavity 6, it is directly limited by the die cavity 6, and there is no need for the staff to manually adjust the position of the blank during the forging process.

[0020] Furthermore, as shown in Figure 2As shown, the bottom of the upper die 1 is provided with a forging head 16 matching the die cavity 6, the bottom of the forging head 16 is provided with a hole die column 7 and a slot module 8, the die cavity 6 is provided with a slot template 11 corresponding to the slot module 8, and the die cavity 6 is provided with a hole position 9 matching the hole die column 7. Specifically, the upper die 1 is connected to an external power device, and the power device drives the upper die 1 to forge downward, and the forging head 16 is pressed into the die cavity 6 to extrude the blank. At the same time, grooves are pressed out on both sides of the blank through the slot module 8 and the slot template 11, and holes at both ends of the crank are pressed out on the blank through the cooperation of the hole die column 7 and the hole position 9.

[0021] Furthermore, if Figure 2 As shown, the lower die 2 has chip grooves 3 on both sides connected to the hole 9, and the bottom surface of the chip groove 3 is inclined. Specifically, the hole 9 is a through hole 14, and the hole die column 7 can directly penetrate the hole 9 downward, and the punched waste can be discharged through the chip groove 3.

[0022] Furthermore, if Figure 2 , Figure 4 As shown, the slot template 11 is slidably connected with the lower die 2 and is provided with a lifting assembly, which includes a slide groove 10 provided at the bottom of the mold cavity 6 and matched with the slot template 11, a through hole 14 connected to the slide groove 10, a lifting rod 4 symmetrically fixed to the side wall of the slot template 11, and a lifting plate 15 fixed to the outer wall of the lower die 2, and the lifting rod 4 passes through the through hole 14 and a hydraulic cylinder 5 is fixed between the lifting plate 15. Specifically, after the forging is completed, the hydraulic cylinder 5 is started to drive the lifting rod 4 to move upward, and the lifting rod 4 drives the slot template 11 to move upward, and the crank is ejected through the slot template 11 to achieve demoulding.

[0023] Furthermore, the top of the slot template 11 is the same shape as the slot module 8, and the top of the slot template 11 extends out of the slide slot 10, and the extending height is the same as the thickness of the slot module 8, thereby ensuring that grooves of the same depth can be formed on both sides of the blank.

[0024] Furthermore, if Figure 2 As shown, a guide groove 12 is formed inside the slide groove 10, and a guide block 13 is fixedly connected to the side wall of the slot template 11 and is slidably placed inside the guide groove 12. Through the cooperation of the guide groove 12 and the guide block 13, the up and down movement of the slot template 11 is better, more stable and smooth.

[0025] Working principle: the lower die 2 is fixed by an external fixing device, the upper die 1 is connected to an external power device to provide downward pressure, the blank is placed in the die cavity 6, the external power device drives the upper die 1 to press down, the forging head 16 enters the die cavity 6, and the blank is extruded into shape. At the same time, grooves are pressed out on both sides of the blank through the groove module 8 and the groove template 11. Through the cooperation of the hole die column 7 and the hole position 9, the holes at both ends of the crank are punched out on the blank. Finally, the crank can be ejected by the lifting assembly.

[0026] The above description is made on the present utility model and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the creation of the present utility model, design without creative efforts structural modes and embodiments similar to the technical solution, they shall fall within the protection scope of the present utility model.

Claims

1. A forging die for a mountain bike crank, comprising an upper die and a lower die, wherein a die cavity is provided on the lower die, and it is characterized in that: The depth of the mold cavity is more than twice the thickness of the produced crank. The bottom of the upper mold is provided with a forging head matching the mold cavity. The bottom of the forging head is provided with a hole die column and a groove module. A groove template corresponding to the groove module is arranged in the mold cavity. The groove template is slidably connected to the lower mold and is provided with a lifting component.

2. The forging die for the crank of a mountain bike according to claim 1, characterized in that: The lifting component includes a sliding groove opened at the bottom of the mold cavity and matching the groove template, a through hole communicated with the sliding groove, lifting rods symmetrically fixed on the side wall of the groove template, and a lifting plate fixed on the outer wall of the lower mold. The lifting rods penetrate through the through holes and a hydraulic cylinder is fixed between the lifting rods and the lifting plate.

3. The forging die for the crank of a mountain bike according to claim 1, wherein: A hole position matching the hole die column is opened in the mold cavity.

4. A forging die for a mountain bike crank according to claim 2, characterized in that: The top of the groove template has the same shape as the groove module. The top end of the groove template extends out of the sliding groove, and the extending height is the same as the thickness of the groove module.

5. The forging die for the crank of a mountain bike according to claim 3, wherein: Chip removal grooves communicated with the hole position are opened on both sides of the lower mold, and the bottom surface of the chip removal groove is inclined.

6. The forging die for the crank of a mountain bike according to claim 2, characterized in that: A guiding groove is opened on the inner side of the sliding groove, and a guiding block slidably placed on the inner side of the guiding groove is fixed on the side wall of the groove template.

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