Volute spiral spring forming tool

Abstract

The volute spiral spring forming tool is installed on a front wall plate of a computer numerical control spring machine, a shaft core and a tool apron are arranged on the front wall plate, the tool apron is circumferentially fixed to the wall plate with the shaft core as the center, and the forming tool comprises an upper forming die, a lower forming die, a rolling bending die and a hydraulic shear. The tool apron comprises a 12-point auxiliary bird sliding tool apron, a 1-point auxiliary bird sliding tool apron, a 6-point auxiliary bird sliding tool apron and a 7-point auxiliary bird sliding tool apron, the upper forming die is installed on the 12-point auxiliary bird sliding tool apron, the lower forming die is installed on the 6-point auxiliary bird sliding tool apron, the rolling bending die is installed on the 7-point auxiliary bird sliding tool apron, and the lower forming die is installed on the 7-point auxiliary bird sliding tool apron. The hydraulic shear is installed on the one-point auxiliary bird sliding tool apron, and volute spiral springs which are small in outer diameter, large in number of turns, small in pitch and wide and thick in wire rod can be formed.

Description

Technical Field

[0001] The utility model belongs to the technical field of spring forming tooling, and particularly relates to a scroll spring forming tooling. Background Art

[0002] The material used for the scroll spring has a thickness of 3.8 mm, a width of 10 mm, an outer diameter of 69.5 mm, and a U-shaped middle part with dimensions of 12.2x18.2. The number of turns is 4.5N, and the pitch between turns is about 2 mm. The required fatigue life is 11,000 times without breakage. With the existing common processing methods for scroll springs, the requirements for the outer diameter drawing size of the scroll spring cannot be met. The pitch is uneven and such a small size cannot be achieved, and the flatness cannot meet the requirement of ≤1.0 mm. For the product torsion test, when the angle rotates from the free state of 0 to 177°, the product will get stuck, and the 11,000 - time fatigue requirement cannot be met. The torque measurement will also exceed the tolerance range due to getting stuck; that is, the existing tooling and forming methods cannot meet the processing requirements of this product. Content of the Utility Model

[0003] In order to overcome the above - mentioned technical problems existing in the prior art field, the utility model provides a scroll spring forming tooling.

[0004] The scroll spring forming tooling provided by the utility model is installed on the front wall plate of a computer numerical control spring machine. The front wall plate is provided with a shaft core and a tool rest. The shaft core is arranged in the center of the front wall plate, and a discharge port is arranged on the shaft core. The tool rest is circumferentially fixed on the wall plate with the shaft core as the center. The forming tooling includes an upper forming die, a lower forming die, a roll - folding and bending die, and a hydraulic shear. The tool rest includes a 12 - point auxiliary bird - sliding tool rest, a 1 - point auxiliary bird - sliding tool rest, a 6 - point auxiliary bird - sliding tool rest, and a 7 - point auxiliary bird - sliding tool rest. The upper forming die is installed on the 12 - point auxiliary bird - sliding tool rest, the lower forming die is installed on the 6 - point auxiliary bird - sliding tool rest, the roll - folding and bending die is installed on the 7 - point auxiliary bird - sliding tool rest, and the hydraulic shear is installed on the 1 - point auxiliary bird - sliding tool rest.

[0005] The upper forming die includes an upper forming wheel, an upper forming wheel fixing seat, an upper forming wheel tool shank, and an upper forming wheel tool shank fixing seat. The upper forming wheel tool shank fixing seat is fixedly installed on the adjusting slide seat of the 12 - point auxiliary bird - sliding tool rest. The upper end of the upper forming wheel tool shank is fixedly installed on the upper forming wheel tool shank fixing seat, the lower end of the upper forming wheel tool shank is fixedly installed with the upper forming wheel fixing seat, and the upper forming wheel is installed on the upper forming wheel fixing seat.

[0006] The upper forming wheel includes an upper forming outer wheel and an upper forming inner wheel. The end of the upper forming wheel fixing seat is set in a two - level stepped shape. The upper forming outer wheel is installed at the upper - level step at the end of the upper forming wheel fixing seat, and the upper forming inner wheel is installed at the lower - level step at the end of the upper forming wheel fixing seat.

[0007] The lower forming die includes a lower forming wheel, a lower forming wheel fixing seat, a lower forming wheel tool shank, and a lower forming wheel tool shank fixing seat. The lower forming wheel tool shank fixing seat is fixedly installed on the adjusting slide of the 6 o'clock auxiliary bird sliding tool rest. The upper end of the lower forming wheel tool shank is fixedly installed on the lower forming wheel tool shank fixing seat. The lower end of the lower forming wheel tool shank is fixedly installed with the lower forming wheel fixing seat, and the lower forming wheel is installed on the lower forming wheel fixing seat.

[0008] The lower forming wheel includes a lower forming outer wheel and a lower forming inner wheel. The end of the lower forming wheel fixing seat is provided with a two-stage stepped shape. The lower forming outer wheel is installed at the upper step of the end of the lower forming wheel fixing seat, and the lower forming inner wheel is installed at the lower step of the end of the lower forming wheel fixing seat.

[0009] The coiling and bending die includes a slider, a rotating tool head, a coiling block, and an auxiliary shaft. The slider is installed on the 7 o'clock auxiliary bird sliding tool rest. The rotating tool head is installed on the slider. The coiling block and the auxiliary shaft are fixed on the end face of the rotating tool head. The coiling block is cylindrical with a bending groove in the middle, and the bending groove divides the cylindrical coiling block into two parts. The auxiliary shaft is arranged on one side of the coiling block.

[0010] The scroll spring forming tooling provided by the present utility model has the beneficial effects that two pairs of forming wheels are designed for the upper forming die and the lower forming die respectively, which can realize the forming of scroll springs with small outer diameter, many turns, and small pitch; by designing the processing of the upper and lower forming wheels, the wire feeding resistance during flattening and winding forming is reduced, and the surface of the spring is prevented from being scratched or damaged; for the two pairs of forming wheels of the upper and lower forming dies, the forming outer wheels and the forming inner wheels are designed not to be on the same horizontal line, so that the spiral outer diameter gradually becomes larger and can be wound smoothly, and the problem of material falling off and running off during forming is prevented. Description of the Drawings

[0011] Figure 1 is the overall structural schematic diagram of an embodiment of the present utility model;

[0012] Figure 2 is the structural schematic diagram of the upper forming die;

[0013] Figure 3 is the structural schematic diagram of the lower forming die;

[0014] Figure 4 is the structural schematic diagram of the coiling and bending die;

[0015] Figure 5 is the structural schematic diagram of the scroll spring;

[0016] Markings in the figure:

[0017] 1. Scroll spring; 2. 12 o'clock auxiliary bird sliding tool holder; 3. 1 o'clock auxiliary bird sliding tool holder; 4. Oil pipe; 5. Hydraulic shear; 6. Auxiliary tool; 7. 3 o'clock auxiliary bird sliding tool holder; 8. Lower forming die; 9. 6 o'clock auxiliary bird sliding tool holder; 10. 7 o'clock auxiliary bird sliding tool holder; 11. Scroll bending die; 12. Shaft core; 13. Upper forming die; 14. Adjusting nut; 15. Upper forming wheel tool shank; 16. Upper forming outer wheel; 17. Upper forming inner wheel; 18. Lower forming outer wheel; 19. Lower forming inner wheel; 20. Lower forming wheel tool shank; 21. Slide block; 22. Rotating tool head; 23. Curling block; 24. Auxiliary shaft. Detailed implementation mode

[0018] The scroll spring forming tooling provided by the present utility model will be described in detail below with reference to the accompanying drawings and in combination with an embodiment.

[0019] Embodiment

[0020] Refer to Figures 1 - 4 In this embodiment, the scroll spring forming tooling is installed on the front wall panel of a computer numerical control spring machine. The front wall panel is provided with a shaft core 12 and tool holders. The shaft core 12 is arranged in the center of the front wall panel, and a discharge port is provided on the shaft core 12. The tool holders are circumferentially fixed on the wall panel with the shaft core as the center. The forming tooling includes an upper forming die 13, a lower forming die 8, a scroll bending die 11, a hydraulic shear 5 and an auxiliary tool 6. The tool holders include a 12 o'clock auxiliary bird sliding tool holder 2, a 1 o'clock auxiliary bird sliding tool holder 3, a 6 o'clock auxiliary bird sliding tool holder 9, a 7 o'clock auxiliary bird sliding tool holder 10, and a 3 o'clock auxiliary bird sliding tool holder 7. The upper forming die 13 is installed on the 12 o'clock auxiliary bird sliding tool holder 2, the lower forming die 8 is installed on the 6 o'clock auxiliary bird sliding tool holder 9, the scroll bending die 11 is installed on the 7 o'clock auxiliary bird sliding tool holder 10, the hydraulic shear 5 is installed on the 1 o'clock auxiliary bird sliding tool holder 3, and the auxiliary tool 6 is installed on the 3 o'clock auxiliary bird sliding tool holder 7.

[0021] The upper forming die 13 includes an upper forming wheel, an upper forming wheel fixing seat, an upper forming wheel tool shank 15, and an upper forming wheel tool shank fixing seat. The upper forming wheel tool shank fixing seat is fixedly installed on the adjusting slide seat of the 12 o'clock auxiliary bird sliding tool holder. The upper end of the upper forming wheel tool shank is fixedly installed on the upper forming wheel tool shank fixing seat, and the lower end of the upper forming wheel tool shank is fixedly installed with the upper forming wheel fixing seat. The upper forming wheel is installed on the upper forming wheel fixing seat.

[0022] The upper forming wheel includes an upper forming outer wheel 16 and an upper forming inner wheel 17. The end of the upper forming wheel fixing seat is provided with a two-stage stepped shape. The upper forming outer wheel is installed at the upper step at the end of the upper forming wheel fixing seat, and the upper forming inner wheel is installed at the lower step at the end of the upper forming wheel fixing seat.

[0023] The lower forming die 8 includes a lower forming wheel, a lower forming wheel fixing seat, a lower forming wheel tool shank 20, and a lower forming wheel tool shank fixing seat. The lower forming wheel tool shank fixing seat is fixedly installed on the adjusting slide seat of the 6 o'clock auxiliary bird sliding tool holder. The upper end of the lower forming wheel tool shank is fixedly installed on the lower forming wheel tool shank fixing seat, the lower end of the lower forming wheel tool shank is fixedly installed with the lower forming wheel fixing seat, and the lower forming wheel is installed on the lower forming wheel fixing seat.

[0024] The lower forming wheel includes a lower forming outer wheel 18 and a lower forming inner wheel 19. The end of the lower forming wheel fixing seat is provided with a two-stage stepped shape. The lower forming outer wheel is installed at the upper step at the end of the lower forming wheel fixing seat, and the lower forming inner wheel is installed at the lower step at the end of the lower forming wheel fixing seat.

[0025] The coiling and bending die 11 includes a slider 21, a rotating tool head 22, a coiling block 23, and an auxiliary shaft 24. The slider 21 is installed on the 7 o'clock auxiliary bird sliding tool holder, the rotating tool head 22 is installed on the slider 21, the coiling block 23 and the auxiliary shaft 24 are fixed on the end face of the rotating tool head 22. The coiling block 23 is cylindrical with a bending groove in the middle, and the bending groove divides the cylindrical coiling block into two parts. The auxiliary shaft 24 is arranged on one side of the coiling block 23.

[0026] The auxiliary bird tool holder is a kind of accessory for a spring machine in the prior art.

[0027] The forming process of the scroll spring forming tooling is as follows:

[0028] 1. Thread threading:

[0029] The material is led out from the material rack, passes through the wire feeding wheel and then through the core hole for threading. The wire feeding wheel and the core are original parts of the spring machine. Since the wire width × thickness (3.8×10) is a specific material, in order to ensure the stability of wire feeding and prevent the material from being flattened or damaged, the wire feeding wheel and the core used in this embodiment are designed and customized according to the width and thickness of the material.

[0030] 2. Middle U-shaped bending:

[0031] The coiling and bending die is installed on the 7 o'clock auxiliary bird sliding tool holder. The size of the wire folding angle is controlled by the rotation angle of the rotating tool head. The length of wire feeding and the rotation angle of the rotating tool head are both realized by computer programming.

[0032] 3. Plane spiral outer diameter forming:

[0033] Install and lock the upper forming die on the 12 o'clock auxiliary bird sliding tool post, and install and lock the lower forming die on the 6 o'clock auxiliary bird sliding tool post; basically align the center of the upper forming inner wheel of the upper forming die with the material center of the shaft core, and adjust the distance between the forming inner wheel and the shaft core by adjusting the adjusting nut 14 for the up and down movement of the sliding seat until the outer diameter of the small end of the scroll spring meets the semi-finished product size requirements; then debug the large outer diameter. It is advisable to move the upper forming inner wheel up until it contacts the upper end face of the raw material, and then move the lower forming die up to the specified position, aligning it with the upper forming die in the front, back, left, and right directions. Since there is a needle bearing in the forming wheel, when the raw material is fed forward, it will rotate together with the forming wheel, and it will be wound and formed between the upper and lower 4 forming wheels, thus completing the forming of the spiral outer diameter of the flat scroll spring; the bearing is designed in the forming wheel and can rotate smoothly. The main purpose is to reduce the wire feeding resistance and avoid pressing or scratching on the surface of the raw material and the forming wheel.

[0034] 4. Pitch and number of turns debugging: After the middle U-shaped and the connecting small arc are transitioned, the lower forming die of the 6 o'clock auxiliary bird sliding tool post is programmed by computer to control the displacement of the lower forming die and set the wire feeding length of the displacement of each part of the tool post through the computer, so as to complete the flat spiral outer diameter size, pitch size and number of turns of the scroll spring.

[0035] 5. Cutting: A hydraulic shear is installed on the sliding seat of the 1 o'clock auxiliary bird sliding tool post. When the outer diameter of the scroll spring is rolled and formed by the roll bending die and the upper and lower forming dies, the front cutting blade block of the hydraulic shear will complete the cutting. This design is mainly to facilitate the replacement of the worn cutting blade, and at the same time reduce the influence of the vibration and impact force during cutting on the processing accuracy of the equipment. The hydraulic shear is connected to the hydraulic equipment through the oil pipe 4.

[0036] As Figure 5 shown, the material used for the manufactured scroll spring 1 has a thickness of 3.8 mm, a width of 10 mm, an outer diameter of 69.5 mm, a middle U-shaped of 12.2x18.2, 4.5 turns, and a pitch of about 2 mm between turns. The required fatigue life is 11,000 times without fracture.

Claims

1. A scroll spring forming tool, installed on the front wall of a computer numerical control spring machine, the front wall is provided with a shaft core and a knife seat, the shaft core is arranged in the middle of the front wall, a discharge port is arranged on the shaft core, and the knife seat is fixed on the wall with the shaft core as the center circumference, characterized in that: The forming tooling includes an upper forming mold, a lower forming mold, a curling and bending mold and a hydraulic shear. The tool holder includes a 12-point auxiliary bird sliding tool holder, a 1-point auxiliary bird sliding tool holder, a 6-point auxiliary bird sliding tool holder and a 7-point auxiliary bird sliding tool holder. The upper forming mold is installed on the 12-point auxiliary bird sliding tool holder, the lower forming mold is installed on the 6-point auxiliary bird sliding tool holder, the curling and bending mold is installed on the 7-point auxiliary bird sliding tool holder, and the hydraulic shear is installed on the 1-point auxiliary bird sliding tool holder.

2. The spiral spring forming tool according to claim 1, characterized in that: The upper forming mold includes an upper forming wheel, an upper forming wheel fixing seat, an upper forming wheel handle, and an upper forming wheel handle fixing seat. The upper forming wheel handle fixing seat is fixedly mounted on the adjustment slide seat of the 12-point auxiliary bird sliding knife seat. The upper end of the upper forming wheel handle is fixedly mounted on the upper forming wheel handle fixing seat. The lower end of the upper forming wheel handle is fixedly mounted on the upper forming wheel fixing seat. The upper forming wheel is mounted on the upper forming wheel fixing seat.

3. The spiral spring forming tool according to claim 2, characterized in that: The upper forming wheel comprises an upper forming outer wheel and an upper forming inner wheel. The end of the upper forming wheel fixing seat is arranged in a two-stage step shape. The upper forming outer wheel is installed at the upper step of the end of the upper forming wheel fixing seat, and the upper forming inner wheel is installed at the lower step of the end of the upper forming wheel fixing seat.

4. The scroll spring forming tool according to claim 1, characterized in that: The lower forming mold includes a lower forming wheel, a lower forming wheel fixing seat, a lower forming wheel handle, and a lower forming wheel handle fixing seat. The lower forming wheel handle fixing seat is fixedly mounted on the adjustment slide of the 6-point auxiliary bird sliding knife seat. The upper end of the lower forming wheel handle is fixedly mounted on the lower forming wheel handle fixing seat. The lower end of the lower forming wheel handle is fixedly mounted on the lower forming wheel fixing seat. The lower forming wheel is mounted on the lower forming wheel fixing seat.

5. The scroll spring forming tool according to claim 4, characterized in that: The lower forming wheel includes a lower forming outer wheel and a lower forming inner wheel. The end of the lower forming wheel fixing seat is arranged in a two-level step shape. The lower forming outer wheel is installed at the upper step of the end of the lower forming wheel fixing seat, and the lower forming inner wheel is installed at the lower step of the end of the lower forming wheel fixing seat.

6. The scroll spring forming tool according to claim 1, characterized in that: The curling and bending mold includes a slider, a rotating cutter head, a curling block and an auxiliary shaft. The slider is installed on a 7-point auxiliary bird sliding tool seat, the rotating cutter head is installed on the slider, the curling block and the auxiliary shaft are fixed on the end face of the rotating cutter head, the curling block is cylindrical with a bending groove in the middle, the bending groove divides the cylindrical curling block into two, and the auxiliary shaft is arranged on one side of the curling block.

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