Machining die for repeatedly stretching product

Abstract

The utility model discloses a machining die for repeatedly stretching a product. The machining die comprises a lower die part and an upper die part which vertically reciprocates relative to the lower die part, the lower die part is provided with a primary guide male die and a secondary guide male die in the material conveying direction, a guide assembly is arranged on the secondary guide male die and comprises a guide sleeve, a pin and a guide spring, the interior of the secondary guide male die is hollow, the guide spring is arranged in the secondary guide male die, the secondary guide male die is provided with a guide groove in the axis direction, and the guide sleeve is provided with a pin hole. The secondary guide male die is sleeved with the guide sleeve, the pin penetrates through the pin hole and the guide groove and abuts against the upper end of the guide spring, and the guide sleeve abuts against the inner circumferential face of the bottom of the material and slides up and down along the guide groove through the pin. And the upper die part is provided with a stretching part which is matched with the primary guide male die and the secondary guide male die to push and stretch materials. The guide sleeve slides up and down along the secondary guide male die under the combined action of the pin and the guide spring, and materials can be accurately pushed to the stretching part of the upper die part to finish stretching work.

Description

Technical Field

[0001] The utility model relates to the technical field of processing dies, in particular to a processing die for multi-stage stretching products. Background Art

[0002] As Figure 1 shown, for multi-station cylindrical stretching products 10', multi-station continuous stretching is generally used for processing. Since the ratio of the height to the diameter of such products is relatively large, and the material used for the products is relatively thin, the strength of the strip connecting ribs is also relatively poor. Therefore, the products are extremely prone to distortion during the production process. In the second station, since the stretching punch is much smaller than the inner cavity size after the first station processing, if the product after the first station processing is distorted, it will cause the axis of the stretching punch in the second station to be inconsistent with the axis of the product after the first station processing, resulting in a greater axis offset of the product in the second stretching. When the offset is serious, it will cause insufficient process residue, resulting in missing material and uneven height at a certain position at the bottom of the product part, insufficient machining accuracy, and ultimately product scrapping.

[0003] As Figure 2 shown, the existing processing dies usually set up a floating guiding device to assist in processing. The floating guiding device includes a guiding sleeve 1', a stretching punch 2', a ejector rod 3' and a spring 4'. Since the processing diameter of the material in the first station is different from that in the second station, in order to enable the guiding sleeve 1' to slide up and down along the stretching punch 2', an additional second fixing plate 7' needs to be added between the first fixing plate 5' and the lower backing plate 6' of the processing die, and an additional space is provided between the second fixing plate 7' and the lower backing plate 6' to place the ejector rod 3' and the spring 4' to ensure the normal operation of the guiding sleeve 1'. During the actual production process, processing the additional space between the second fixing plate 7' and the lower backing plate 6' is not only troublesome in operation, but also more parts mean a higher failure rate, which is likely to affect the production efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a processing die for multi-stage stretching products, which can ensure the processing accuracy of multi-stage stretching products and improve the production efficiency.

[0005] To achieve the above object, the solution of the present utility model is: a processing die for a multi-stretch product, including a lower die part and an upper die part that reciprocates vertically relative to the lower die part; the lower die part is provided with a first guiding punch and a second guiding punch along the material transmission direction, and the second guiding punch is provided with a guiding component for guiding the material processed by the first guiding punch. The guiding component includes a guiding sleeve, a pin and a guiding spring. The inside of the second guiding punch is hollow, the guiding spring is placed inside the second guiding punch, the second guiding punch is provided with a guiding groove along the axial direction, the guiding sleeve is provided with a pin hole, the guiding sleeve is sleeved on the second guiding punch, the pin passes through the pin hole and the guiding groove and abuts against the upper end of the guiding spring, and the guiding sleeve abuts against the inner peripheral surface of the bottom of the material and slides up and down along the guiding groove through the pin; the upper die part is provided with a stretching part for pushing and stretching the material in cooperation with the first guiding punch and the second guiding punch.

[0006] In a preferred embodiment, it further includes a stripper plate for supporting the material. The lower die part includes a first lower fixing plate, a second lower fixing plate, a lower backing plate and a lower die base that are sequentially connected and fixed from top to bottom. The stripper plate is arranged between the upper die part and the first lower fixing plate. The stripper plate is connected to the lower die base through an elastic component. The stripper plate is provided with a first through hole and a second through hole. One ends of the first guiding punch and the second guiding punch are respectively fixed on the first lower fixing plate, and the other ends of the first guiding punch and the second guiding punch respectively pass through the first through hole and the second through hole of the stripper plate.

[0007] In a preferred embodiment, the elastic component includes a buffer spring and a spring core shaft. The lower die part is provided with a first blind hole that extends from the upper surface of the first lower fixing plate to the lower die base. The stripper plate is provided with a third through hole. One end of the buffer spring is placed at the bottom of the first blind hole of the lower die base, the other end of the buffer spring extends out of the upper surface of the first lower fixing plate, one end of the spring core shaft is connected to the other end of the buffer spring, and the other end of the spring core shaft passes through the third through hole of the stripper plate.

[0008] In a preferred embodiment, the stretching part includes a first stretching channel and a second stretching channel. The upper die part includes an upper die base, an upper backing plate and a concave template that are sequentially connected and fixed from top to bottom. The upper die base is connected to the punch slide block. The upper die part is provided with a second blind hole and a third blind hole that extend from the lower surface of the concave template to the upper template. The part of the second blind hole located in the concave template forms the first stretching channel, and the part of the third blind hole located in the concave template forms the second stretching channel.

[0009] In a preferred embodiment, the upper die part further includes a first inner pushing block. The part of the second blind hole located in the upper backing plate forms a first sliding cavity for accommodating the first inner pushing block. The diameter of the first sliding cavity is larger than the diameter of the first stretching channel. A first boss is formed between the first sliding cavity and the first stretching channel. A first flange is formed at the upper end of the first inner pushing block. The first flange at the upper end of the first inner pushing block abuts against the first boss, and the lower end surface of the first inner pushing block is flush with the lower surface of the concave template.

[0010] Preferably, it further includes a first push block spring, one end of the first push block spring abuts against the upper end surface of the first inner push block, and the other end of the first push block spring abuts against the top of the second blind hole of the upper die base.

[0011] Preferably, the upper die part further includes a secondary inner push block. The part of the third blind hole located in the upper backing plate forms a second sliding cavity for accommodating the secondary inner push block. The diameter of the second sliding cavity is larger than that of the secondary stretching channel. A second boss is formed between the second sliding cavity and the secondary stretching channel. A second flange is formed at the upper end of the secondary inner push block. The second flange at the upper end of the secondary inner push block abuts against the second boss. The lower end surface of the secondary inner push block is flush with the lower surface of the concave die plate.

[0012] Preferably, it further includes a second push block spring, one end of the second push block spring abuts against the upper end surface of the secondary inner push block, and the other end of the second push block spring abuts against the top of the third blind hole of the upper die base.

[0013] Preferably, the upper die part further includes a pressure rod. The upper die part is provided with a fourth blind hole. The fourth blind hole extends from the lower surface of the concave die plate to the upper template. The part of the fourth blind hole located in the upper backing plate forms a third sliding cavity for accommodating the pressure rod. The concave die plate is provided with a fourth through hole for the pressure rod to pass through. A third boss is formed between the third sliding cavity and the fourth through hole. A third flange is formed at the upper end of the pressure rod. The first flange at the upper end of the pressure rod abuts against the third boss. The lower end of the pressure rod passes through the lower surface of the concave die plate.

[0014] Preferably, it further includes a pressure rod spring, one end of the pressure rod spring abuts against the upper end surface of the pressure rod, and the other end of the pressure rod spring abuts against the top of the fourth blind hole of the upper die base.

[0015] After adopting the above scheme, the beneficial effects of the present utility model are as follows: The present utility model is provided with a guiding assembly on the secondary drawing punch of the lower die part. The guiding sleeve of the guiding assembly slides up and down along the secondary drawing punch under the combined action of the pin and the guiding spring. Thus, the guiding assembly guides the material after being processed by the primary drawing punch, enabling the material to be accurately pushed into the stretching part of the upper die part to complete the stretching work, ensuring the processing accuracy of the material, and improving the product quality and production efficiency. Brief Description of the Drawings

[0016] Figure 1 is a sectional view of an existing multi-station cylindrical stretching product along the axial direction;

[0017] Figure 2 is a schematic diagram of a floating guiding device on an existing processing die;

[0018] Figure 3 is a schematic structural diagram of the present utility model;

[0019] Figure 4 It is a schematic structural view of the upper die part of the present utility model;

[0020] Figure 5 It is a schematic structural view of the lower die part of the present utility model;

[0021] Figure 6 It is a schematic structural view of the material of the present utility model placed on the secondary drawing punch;

[0022] Figure 7 It is a schematic structural view of the closed die state of the present utility model.

[0023] Label description:

[0024] 1. Upper die part; 11. Upper die base; 111. Second blind hole; 112. Third blind hole; 113. Fourth blind hole; 12. Upper backing plate; 13. Concave template; 131. Primary drawing stretching channel; 132. Secondary drawing stretching channel; 14. Primary drawing inner pushing block; 141. First sliding cavity; 142. First boss; 143. First flange; 15. Secondary drawing inner pushing block; 151. Second sliding cavity; 152. Second boss; 153. Second flange; 16. Pressure rod; 161. Third sliding cavity; 162. Third boss; 163. Third flange; 17. First pushing block spring; 18. Second pushing block spring; 19. Pressure rod spring; 2. Lower die part; 21. First lower fixing plate; 22. Second lower fixing plate; 23. Lower backing plate; 24. Lower die base; 241. First blind hole; 25. Primary drawing punch; 26. Secondary drawing punch; 261. Guide sleeve; 262. Pin; 263. Guide spring; 27. Spring core shaft; 28. Buffer spring; 3. Stripping plate; 31. First through hole; 32. Second through hole; 33. Third through hole; 4. Material. Specific embodiments

[0025] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] This embodiment provides a processing die for multi-drawing products. As Figures 3 to 7 shown, it includes a lower die part 2 and an upper die part 1 that reciprocates vertically relative to the lower die part 2; the lower die part 2 is provided with a primary drawing punch 25 and a secondary drawing punch 26 along the transmission direction of the material 4, and the secondary drawing punch 26 is provided with a guiding assembly for guiding the material 4 processed by the primary drawing punch 25. Specifically, refer to Figure 6, the guiding component includes a guiding sleeve 261, a pin 262 and a guiding spring 263. The secondary drawing punch 26 is hollow inside. The guiding spring 263 is placed inside the secondary drawing punch 26. The secondary drawing punch 26 is provided with a guiding groove along the axial direction. The guiding sleeve 261 is provided with a pin hole for the pin 262. The guiding sleeve 261 is sleeved on the secondary drawing punch 26. The pin 262 passes through the pin hole and the guiding groove and abuts against the upper end of the guiding spring 263. The guiding sleeve 261 abuts against the inner peripheral surface of the bottom of the material 4 and slides up and down along the guiding groove through the pin 262; the upper die part 1 is provided with a stretching part for cooperating with the primary drawing punch 25 and the secondary drawing punch 26 to push and stretch the material 4.

[0027] In this embodiment, the upper die part 1 reciprocates vertically relative to the lower die part 2, enabling the die to work stably during the stretching process. The cooperation between the upper die part 1 and the lower die part 2 ensures the accuracy and consistency of the stretching action. The lower die part 2 is provided with a primary drawing punch 25 and a secondary drawing punch 26 along the transmission direction of the material 4. This setting is conducive to realizing the multi-stage stretching process. By gradually guiding the material 4 to be stretched, the forming quality and precision of the product are improved. The guiding spring 263 is placed inside the secondary drawing punch 26. Through its elastic force, it can buffer the impact force during the stretching process and protect the die and the material 4 from damage. At the same time, the guiding spring 263 can also keep the guiding sleeve 261 in close contact with the inner circumference of the bottom of the material 4, ensuring the smooth progress of the stretching of the material 4. By controlling the downward pressure of the upper die part 1, the guiding sleeve 261 slides downward along the secondary drawing punch 26 through the pin 262 in cooperation with the guiding groove, thereby guiding the material 4 on the guiding sleeve 261 to be pushed into the stretching part. The limiting effect of the stretching part enables the material 4 to be uniformly deformed and extended, improving the product precision and quality.

[0028] As Figure 3 and Figure 5 shown, it further includes a stripper plate 3 for supporting the material 4. The lower die part 2 includes a first lower fixing plate 21, a second lower fixing plate 22, a lower backing plate 23 and a lower die base 24 which are fixedly connected in sequence from top to bottom. The stripper plate 3 is arranged between the upper die part 1 and the first lower fixing plate 21. The stripper plate 3 is connected to the lower die base 24 through an elastic component. The stripper plate 3 is provided with a first through hole 31 and a second through hole 32. One ends of the primary drawing punch 25 and the secondary drawing punch 26 are respectively fixed on the first lower fixing plate 21, and the other ends of the primary drawing punch 25 and the secondary drawing punch 26 respectively pass through the first through hole 31 and the second through hole 32 of the stripper plate 3.

[0029] In this embodiment, the stripping plate 3 is located between the upper die part 1 and the first lower fixing plate 21, providing a stable support platform for the material 4 during the stretching process. The stripping plate 3 is connected to the lower die base 24 through an elastic component, enabling the stripping plate 3 to produce a certain elastic deformation when pushed by the upper die part 1, so as to adapt to the stretching requirements of materials 4 with different specifications and shapes. Since the primary drawing punch 25 and the secondary drawing punch 26 are respectively fixed on the first lower fixing plate 21, the first through hole 31 and the second through hole 32 for making way are respectively provided on the stripping plate 3. When the upper die assembly presses down, the stretching part first contacts the material 4 on the stripping plate 3, and then the upper die assembly contacts the stripping plate 3 and continuously presses down through the elastic component, causing the primary drawing punch 25 and the secondary drawing punch 26 to push the material 4 into the stretching part of the upper die assembly to complete the stretching work.

[0030] As Figure 3 and Figure 5 shown, the elastic component includes a buffer spring 28 and a spring core shaft 27. The lower die part 2 is provided with a first blind hole 241, and the first blind hole 241 extends from the upper surface of the first lower fixing plate 21 to the lower die base 24. The stripping plate 3 is provided with a third through hole 33. One end of the buffer spring 28 is placed at the bottom of the first blind hole 241 of the lower die base 24, and the other end of the buffer spring 28 extends out of the upper surface of the first lower fixing plate 21. One end of the spring core shaft 27 is connected to the other end of the buffer spring 28, and the other end of the spring core shaft 27 passes through the third through hole 33 of the stripping plate 3.

[0031] In this embodiment, a buffer spring 28 is arranged between the lower die part 2 and the stripping plate 3, which can effectively reduce the impact and vibration generated during the mold closing, mold opening or stripping process. In this embodiment, the first blind hole 241 extends from the upper surface of the first lower fixing plate 21 to the lower die base 24. During the specific processing, the depth of the first blind hole 241 can be adjusted according to actual needs. At the same time, the length and strength of the supporting buffer spring 28 should also be adjusted adaptively to ensure the best buffer effect.

[0032] As Figure 3 and Figure 4 shown, the stretching part includes a primary drawing channel 131 and a secondary drawing channel 132. The upper die part 1 includes an upper die base 11, an upper backing plate 12 and a cavity plate 13 which are sequentially connected and fixed from top to bottom. The upper die base 11 is connected to a punch press slider (not shown in the figure). The upper die part 1 is provided with a second blind hole 111 and a third blind hole 112. The second blind hole 111 and the third blind hole 112 extend from the lower surface of the cavity plate 13 to the upper template. The part of the second blind hole 111 located in the cavity plate 13 forms the primary drawing channel 131, and the part of the third blind hole 112 located in the cavity plate 13 forms the secondary drawing channel 132.

[0033] In this embodiment, the primary stretching channel 131 and the secondary stretching channel 132 can guide and limit the stretching of the material 4. The dimensions of the primary stretching channel 131 and the secondary stretching channel should be adjusted according to actual production and processing to ensure that the material is evenly stressed during the stretching process, reduce the twisting and deformation of the material during the stretching process, and thus improve the processing accuracy and quality of the product.

[0034] As Figure 3 and Figure 4 shown, the upper die part 1 further includes a primary inner pushing block 14. The part of the second blind hole 111 located in the upper backing plate 12 forms a first sliding cavity 141 for accommodating the primary inner pushing block 14. The diameter of the first sliding cavity 141 is larger than the diameter of the primary stretching channel 131. A first boss 142 is formed between the first sliding cavity 141 and the primary stretching channel 131. A first flange 143 is formed at the upper end of the primary inner pushing block 14. The first flange 143 at the upper end of the primary inner pushing block 14 abuts against the first boss 142, and the lower end surface of the primary inner pushing block 14 is flush with the lower surface of the cavity plate 13.

[0035] In this embodiment, the primary inner pushing block 14 is provided. When the upper die part 1 is pressed down, since the lower end surface of the primary inner pushing block 14 is flush with the lower surface of the cavity plate 13, the lower end surface of the primary inner pushing block 14 will contact the upper end surface of the material 4, playing a role of preliminary fixation. The primary inner pushing block 14 slides upward along the first sliding cavity 141, and the primary punch 25 pushes the material 4 into the primary stretching channel 131. Then the upper die part 1 continues to be pressed down until the material 4 is stretched and extended in the primary stretching channel 131.

[0036] As Figure 3 and Figure 4 shown, it further includes a first pushing block spring 17. One end of the first pushing block spring 17 abuts against the upper end surface of the primary inner pushing block 14, and the other end of the first pushing block spring 17 abuts against the top of the second blind hole 111 of the upper die base 11.

[0037] In this embodiment, when stretching and extending the material 4, the primary inner pushing block 14 slides upward along the first sliding cavity 141. When the stretching is completed, the elastic force of the first pushing block spring 17 makes the primary inner pushing block 14 automatically reset to the initial position, that is, the lower end surface of the primary inner pushing block 14 is flush with the lower surface of the cavity plate 13, improving the automation degree and operation efficiency of the mold. In addition, the first pushing block spring 17 also has a certain buffering effect, extending the service life of the mold.

[0038] As Figure 3 and Figure 4As shown, the upper die part 1 further includes a secondary drawing inner pushing block 15. A second sliding cavity 151 for accommodating the secondary drawing inner pushing block 15 is formed in the part of the upper backing plate 12 where the third blind hole 112 is located. The diameter of the second sliding cavity 151 is larger than that of the secondary drawing channel 132. A second boss 152 is formed between the second sliding cavity 151 and the secondary drawing channel 132. A second flange 153 is formed at the upper end of the secondary drawing inner pushing block 15. The second flange 153 at the upper end of the secondary drawing inner pushing block 15 abuts against the second boss 152. The lower end face of the secondary drawing inner pushing block 15 is flush with the lower surface of the cavity plate 13.

[0039] In this embodiment, the secondary drawing inner pushing block 15 is provided. When the upper die part 1 presses down, since the lower end face of the secondary drawing inner pushing block 15 is flush with the lower surface of the cavity plate 13, the lower end face of the secondary drawing inner pushing block 15 will contact the upper end face of the material 4 processed by the primary drawing punch 25, playing a role of preliminary fixation. The secondary drawing inner pushing block 15 slides upward along the second sliding cavity 151. The secondary drawing punch 26 pushes the material 4 into the secondary drawing channel 132, and then the upper die part 1 continues to press down until the material 4 is stretched and extended in the secondary drawing channel 132.

[0040] As Figure 3 and Figure 4 shown, it further includes a second push block spring 18. One end of the second push block spring 18 abuts against the upper end face of the secondary drawing inner pushing block 15, and the other end of the second push block spring 18 abuts against the top of the third blind hole 112 of the upper die base 11.

[0041] When stretching and extending the material 4 processed by the primary drawing punch 25 in this embodiment, the primary drawing inner pushing block 14 slides upward along the first sliding cavity 141. When the stretching is completed, the elastic force of the first push block spring 17 makes the primary drawing inner pushing block 14 automatically reset to the initial position, that is, the lower end face of the primary drawing inner pushing block 14 is flush with the lower surface of the cavity plate 13, improving the automation degree and operation efficiency of the mold. In addition, the first push block spring 17 also has a certain buffering effect, prolonging the service life of the mold.

[0042] As Figure 3 and Figure 4 shown, the upper die part 1 further includes a pressure rod 16. The upper die part 1 is provided with a fourth blind hole 113. The fourth blind hole 113 extends from the lower surface of the cavity plate 13 to the upper template. A third sliding cavity 161 for accommodating the pressure rod 16 is formed in the part of the upper backing plate 12 where the fourth blind hole 113 is located. The cavity plate 13 is provided with a fourth through hole for the pressure rod 16 to pass through. A third boss 162 is formed between the third sliding cavity 161 and the fourth through hole. A third flange 163 is formed at the upper end of the pressure rod 16. The first flange 143 at the upper end of the pressure rod 16 abuts against the third boss 162. The lower end of the pressure rod 16 passes through the lower surface of the cavity plate 13.

[0043] In this embodiment, a pressure rod 16 is provided. When the upper mold part 1 is pressed down, the pressure rod 16 first contacts the unloading plate 3. After being pressed down for a distance, the lower end surface of the first inner push block 14 and the lower end surface of the secondary inner push block 15 respectively abut against the material 4 of the first leading punch 25 and the secondary leading punch 26. The upper mold part 1 is continuously pressed down, and the material 4 is pushed into the first leading stretching channel 131 and the secondary leading stretching channel 132 to complete the stretching work.

[0044] like Figure 3 and Figure 4 As shown, it also includes a pressure rod spring 19 , one end of which abuts against the upper end surface of the pressure rod 16 , and the other end of the pressure rod spring 19 abuts against the top of the fourth blind hole 113 of the upper die seat 11 .

[0045] In this embodiment, when the material 4 is stretched, the pressure rod 16 will slide upward along the third sliding cavity 161. When the stretching is completed, the elastic force of the pressure rod spring 19 causes the pressure rod 16 to automatically return to the initial position. At the same time, the pressure rod spring 19 also has a certain buffering effect.

[0046] The working principle of the utility model is as follows:

[0047] When the material 4 completes the first stretching process through the first leading punch 25 of the lower mold part 2 in cooperation with the first leading inner push block 14 and the first leading stretching channel 131 of the upper mold part 1, the material 4 will be conveyed to the secondary leading punch 26 by the conveyor belt.

[0048] The punch slide drives the upper die part 1 downward, and the concave die plate 13 of the upper die part 1 contacts the spring core shaft 27. The spring core shaft 27 presses the buffer spring 28, so that the stripper plate 3 is in a non-pressurized state. At the same time, the punch slide continues to drive the upper die part 1 downward, and the pressure rod 16 contacts the stripper plate 3 and presses the stripper plate 3 downward under the action of the pressure rod spring 19.

[0049] When the stripper plate 3 moves downward for a certain distance, the guide sleeve 261 installed on the secondary lead punch 26, under the action of the guide spring 263 and the pin 262, follows the secondary lead punch 26 to expose the second through hole 32 of the stripper plate 3, and the secondary lead punch 26 abuts against the bottom inner circumference of the material 4 processed by the first stretching process. The upper mold part 1 continues to press down, and the lower end face of the secondary lead inner push block 15 abuts against the material 4. The secondary lead inner push block 15 slides upward along the second sliding cavity 151 through the second push block spring 18, and the secondary lead punch 26 pushes the material 4 into the secondary lead stretching channel 132, as shown in FIG. Figure 7 As shown, the secondary stretching work is completed.

[0050] After the stretching operation is completed, the punch slide drives the upper die part 1 to rise and return. Within a certain return distance range, due to the combined action of the pressure rod 16, the pressure rod spring 19, and the spring mandrel 27, the elastic force of the buffer spring 28 will not be released temporarily, and the stripper plate 3 will not rise and return with the upper die part 1. When the upper die part 1 continues to rise, the spring mandrel 27 pushes the stripper plate 3 to rise and return with the upper die part 1 under the action of the buffer spring 28. The first push block spring 17 and the second push block spring 18 of the upper die part 1 respectively apply elastic forces to the first inner push block 14 and the second inner push block 15, pushing the material 4 out of the first stretching channel 131 and the second stretching channel 132 respectively, thus completing the demolding operation. The first stretching process and the second stretching process are carried out synchronously. The material 4 processed by the first stretching process and the second stretching process will be conveyed by the conveyor belt to the next stretching process, and so on in a cycle.

[0051] The orientation terms mentioned in this specification are defined relative to the structures shown in the respective drawings. They are relative concepts and may therefore change accordingly depending on their different positions and usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0052] The above are only the preferred embodiments of the present utility model and do not limit the design of this case. All equivalent changes made according to the key design of this case fall within the protection scope of this case.

Claims

1. A processing die for a multi-stretched product, characterized in that: It includes a lower die part and an upper die part that reciprocates vertically relative to the lower die part; The lower die part is provided with a first guiding punch and a second guiding punch along the material transmission direction. A guiding component for guiding the material after being processed by the first guiding punch is provided on the second guiding punch. The guiding component includes a guiding sleeve, a pin, and a guiding spring. The inside of the second guiding punch is hollow. The guiding spring is placed inside the second guiding punch. The second guiding punch is provided with a guiding groove along the axial direction. The guiding sleeve is provided with a pin hole. The guiding sleeve is sleeved on the second guiding punch. The pin passes through the pin hole and the guiding groove and abuts against the upper end of the guiding spring. The guiding sleeve abuts against the inner peripheral surface of the bottom of the material and slides up and down along the guiding groove through the pin; The upper die part is provided with a stretching part for pushing and stretching the material in cooperation with the first guiding punch and the second guiding punch.

2. The processing die for a multi-stretched product according to claim 1, characterized in that: It further includes a stripper plate for supporting the material. The lower die part includes a first lower fixing plate, a second lower fixing plate, a lower backing plate, and a lower die base that are sequentially connected and fixed from top to bottom. The stripper plate is arranged between the upper die part and the first lower fixing plate. The stripper plate is connected to the lower die base through an elastic component. The stripper plate is provided with a first through hole and a second through hole. One ends of the first guiding punch and the second guiding punch are respectively fixed on the first lower fixing plate, and the other ends of the first guiding punch and the second guiding punch respectively pass through the first through hole and the second through hole of the stripper plate.

3. The processing die for a multi-stretched product according to claim 2, wherein: The elastic component includes a buffer spring and a spring core shaft. The lower die part is provided with a first blind hole that extends from the upper surface of the first lower fixing plate into the lower die base. The stripper plate is provided with a third through hole. One end of the buffer spring is placed at the bottom of the first blind hole of the lower die base, and the other end of the buffer spring extends out of the upper surface of the first lower fixing plate. One end of the spring core shaft is connected to the other end of the buffer spring, and the other end of the spring core shaft passes through the third through hole of the stripper plate.

4. The processing die for a multi-stretched product according to claim 1, characterized in that: The stretching part includes a first guiding stretching channel and a second guiding stretching channel. The upper die part includes an upper die base, an upper backing plate, and a concave template that are sequentially connected and fixed from top to bottom. The upper die base is connected to the punch slide block. The upper die part is provided with a second blind hole and a third blind hole that extend from the lower surface of the concave template into the upper template. The part of the second blind hole located in the concave template forms the first guiding stretching channel, and the part of the third blind hole located in the concave template forms the second guiding stretching channel.

5. The processing die for a multi-stretched product according to claim 4, wherein: The upper die part further includes a first inner pushing block. The part of the second blind hole located in the upper backing plate forms a first sliding cavity for accommodating the first inner pushing block. The diameter of the first sliding cavity is larger than the diameter of the first guiding stretching channel. A first boss is formed between the first sliding cavity and the first guiding stretching channel. A first flange is formed at the upper end of the first inner pushing block. The first flange at the upper end of the first inner pushing block abuts against the first boss. The lower end surface of the first inner pushing block is flush with the lower surface of the concave template.

6. The processing die for a multi-stretched product according to claim 5, wherein: It further includes a first pushing block spring. One end of the first pushing block spring abuts against the upper end surface of the first inner pushing block, and the other end of the first pushing block spring abuts against the top of the second blind hole of the upper die base.

7. The processing die for a multi-stretched product according to claim 4, characterized in that: The upper die part further includes a secondary drawing inner pushing block. The part of the third blind hole located in the upper backing plate forms a second sliding cavity for accommodating the secondary drawing inner pushing block. The diameter of the second sliding cavity is larger than that of the secondary drawing channel. A second boss is formed between the second sliding cavity and the secondary drawing channel. A second flange is formed at the upper end of the secondary drawing inner pushing block. The second flange at the upper end of the secondary drawing inner pushing block abuts against the second boss. The lower end face of the secondary drawing inner pushing block is flush with the lower surface of the concave template.

8. The processing die for a multi-stretched product according to claim 7, characterized in that: It further includes a second pushing block spring. One end of the second pushing block spring abuts against the upper end face of the secondary drawing inner pushing block, and the other end of the second pushing block spring abuts against the top of the third blind hole of the upper die base.

9. The processing die for a multi-stretched product according to claim 4, wherein: The upper die part further includes a pressure rod. The upper die part is provided with a fourth blind hole. The fourth blind hole extends from the lower surface of the concave template to the upper template. The part of the fourth blind hole located in the upper backing plate forms a third sliding cavity for accommodating the pressure rod. The concave template is provided with a fourth through hole for the pressure rod to pass through. A third boss is formed between the third sliding cavity and the fourth through hole. A third flange is formed at the upper end of the pressure rod. The first flange at the upper end of the pressure rod abuts against the third boss. The lower end of the pressure rod passes through the lower surface of the concave template.

10. The processing die for a multi-stretched product according to claim 9, characterized in that: It further includes a pressure rod spring. One end of the pressure rod spring abuts against the upper end face of the pressure rod, and the other end of the pressure rod spring abuts against the top of the fourth blind hole of the upper die base.

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