Stamping and drawing die

Abstract

The utility model discloses a stamping and drawing die, which comprises a female die assembly, a jacking assembly, a punch assembly, a fixing block, a connecting block and a product, the punch assembly adopts a structural form of combining a large-diameter punch and a small-diameter punch, and the small-diameter punch is dynamically controlled to stretch out and draw back through a nitrogen spring, so that the small-diameter punch preferentially extends to the inner diameter of the small diameter of the product before stamping; when the small-diameter punch abuts against the inner diameter of the small head of the product, the small-diameter punch starts to work to support the inner diameter of the small diameter of the product and the bottom face of the product, concentricity deviation caused by step-by-step punching of a traditional die is avoided, the press continues to move downwards, the small-diameter punch has upward force, the upward force pushes the nitrogen spring, the large-diameter punch works to support the inner diameter of the large diameter of the product, and the large-diameter punch does not work to support the bottom face of the product. When the bottom faces of the large diameter and the small diameter of the product are stressed to be attached to the upper end of the abutting female die and the ejector rod, work of the large diameter and the small diameter inside the product is completed, the large-diameter punch and the small-diameter punch act synchronously, it is guaranteed that cylindricity of the large diameter and cylindricity of the small diameter of the product are coaxial, and therefore precision of cylindricity of the inner diameter of the product is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically a stamping and stretching mold. Background Technology

[0002] In manufacturing, stamping and drawing is a widely used metal forming method, playing a crucial role, especially in the production of parts with specific shape and size requirements. For products requiring specific inner diameter cylindricity, such as certain precision mechanical parts and electronic device housings, the design and performance of stamping and drawing dies directly affect product quality and production efficiency. Traditional stamping and drawing dies are relatively simple in structure, typically containing only basic punches, dies, and other components to achieve basic product forming. However, as market demands for product quality continue to increase, particularly with increasingly stringent requirements for the accuracy of key dimensions such as inner diameter cylindricity, traditional dies are gradually revealing some shortcomings.

[0003] During the stamping and stretching process, the forming quality of the inner diameter cylindricity of the product is affected by a variety of factors. On the one hand, the design and movement mode of the punch play a decisive role in the forming of the inner diameter of the product. The punch of traditional molds often has a simple structure and it is difficult to make precise adjustments according to different stages of the product forming process. This leads to problems such as deformation and dimensional deviation of the inner diameter of the product during the forming process. For normal stepped stretching products, the inner and outer diameter cylindricity is not good, and it is difficult to meet the high-precision cylindricity requirements. Therefore, we need to propose a stamping and stretching die. Utility Model Content

[0004] The purpose of this utility model is to provide a stamping and drawing die that, through the synchronous action of a large-diameter punch and a small-diameter punch, ensures that the cylindricity of the large and small diameters of the product is coaxial, thereby significantly improving the accuracy of the cylindricity of the product's inner diameter and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A stamping and stretching die includes a die assembly, a lifting assembly, a punch assembly, a fixing block, a connecting block, and a product. The punch assembly is disposed above the die assembly and is used to stamp and stretch the inner diameter of the product placed inside the die assembly. The lifting assembly is disposed below the die assembly and is used to eject the formed product from the die assembly. The fixing block is disposed on the outer side of the top of the punch assembly and is used to install the punch assembly. The connecting block is disposed on the top of the fixing block and is used to connect to the power end of the press, thereby realizing the stamping and stretching forming of the inner diameter cylindricity of the product inside the die assembly by the punch assembly.

[0007] Preferably, the punch assembly includes a large-diameter punch, a small-diameter punch, and a nitrogen spring. The large-diameter punch is installed inside the fixing block, and the top of the large-diameter punch is fixedly installed to the bottom of the connecting block. The small-diameter punch and the nitrogen spring are both installed inside the large-diameter punch. The top of the nitrogen spring is bolted to the connecting block, and the bottom of the nitrogen spring abuts against the top of the small-diameter punch. The bottom of the small-diameter punch extends beyond the bottom of the large-diameter punch.

[0008] Preferably, the top outer walls of both the large-diameter punch and the small-diameter punch are integrally formed with an outer circular protrusion, the inside of the fixing block is provided with a stepped groove adapted to the large-diameter punch, and the inside of the large-diameter punch is set with a stepped hole, which is used to accommodate the small-diameter punch and the nitrogen spring.

[0009] Preferably, the die assembly includes a pad, an abutting die, and a guiding die, wherein the abutting die is fixedly installed on the top of the pad, and the guiding die is fixedly installed on the top of the abutting die.

[0010] Preferably, the lifting assembly includes a connecting rod, a push rod, and an upper push block. The push rod is fixedly installed on the top of the connecting rod and is located inside the abutting die. The upper push block is fixedly installed on the bottom of the connecting rod and is used to connect the upper lifting mechanism of the press.

[0011] Preferably, the bottom of the pad has a groove that matches the top block, and the top of the groove has a connecting hole that communicates with the inside of the abutting die. One end of the connecting rod extends through the connecting hole into the inside of the abutting die.

[0012] Preferably, the small-diameter punch, the connecting rod, and the push rod all have vent holes for easy venting. The vent holes extend axially through the small-diameter punch, the connecting rod, and the push rod to discharge gas during the stamping process.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model's punch assembly adopts a structure combining a large-diameter punch and a small-diameter punch. This graded design can better match the different stages of the product's inner diameter forming process. In the initial stage of stamping and stretching, the large-diameter punch first carries the product into the guide die, and then the press continues to drive the punch downwards. The extension and retraction of the small-diameter punch is dynamically controlled by a nitrogen spring, allowing it to extend to the small-diameter inner diameter of the product before stamping. When the small-diameter punch touches the inner diameter of the small end of the product, it begins to work, supporting the small-diameter inner diameter and bottom of the product. To avoid concentricity deviations caused by step-by-step stamping in traditional molds, the press continues downward with the small-diameter punch exerting an upward force. This upward force pushes the nitrogen spring, while the large-diameter punch supports the inner diameter of the product. When the bottom surfaces of the large and small diameters of the product are pressed against the upper end of the die and the ejector pin, the internal machining of the large and small diameters of the product is completed. The large-diameter punch and the small-diameter punch work synchronously to ensure that the cylindricity of the large and small diameters of the product is coaxial, thereby significantly improving the accuracy of the cylindricity of the inner diameter of the product and meeting the production requirements of high-precision products. Attached Figure Description

[0015] Figure 1 This is a side view of the three-dimensional structure of the present invention;

[0016] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the small-diameter punch and nitrogen spring of this utility model;

[0018] Figure 4 This is a structural schematic diagram of the large-diameter punch and product of this utility model.

[0019] In the diagram: 1. Die assembly; 11. Pad block; 12. Abutting die; 13. Guiding die; 14. Groove; 2. Lifting assembly; 21. Connecting rod; 22. Ejector rod; 23. Upper ejector block; 3. Punch assembly; 31. Large diameter punch; 32. Small diameter punch; 33. Nitrogen spring; 34. Outer circle protrusion; 4. Fixing block; 41. Stepped groove; 5. Connecting block; 6. Product. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 This utility model provides a technical solution:

[0022] A stamping and stretching die includes a die assembly 1, a lifting assembly 2, a punch assembly 3, a fixing block 4, a connecting block 5, and a product 6. The punch assembly 3 is disposed above the die assembly 1 and is used to stamp and stretch the inner diameter of the product 6 placed inside the die assembly 1. The lifting assembly 2 is disposed below the die assembly 1 and is used to eject the formed product 6 from the die assembly 1. The fixing block 4 is disposed on the outer side of the top of the punch assembly 3 and is used to install the punch assembly 3. The connecting block 5 is disposed on the top of the fixing block 4 and is used to connect to the power end of the press, so as to realize the stamping and stretching forming of the inner diameter cylindricity of the product 6 inside the die assembly 1 by the punch assembly 3.

[0023] It should be noted that the lifting component 2 is linked with the die component 1, and the product 6 is automatically ejected after forming, which improves production efficiency. The punch component 3 directly acts on the inner diameter of the product to ensure that the cylindricity meets the requirements and reduces the need for subsequent processing.

[0024] In an optional embodiment: the punch assembly 3 includes a large-diameter punch 31, a small-diameter punch 32, and a nitrogen spring 33. The large-diameter punch 31 is installed inside the fixing block 4, and the top of the large-diameter punch 31 is fixedly installed to the bottom of the connecting block 5. The small-diameter punch 32 and the nitrogen spring 33 are both installed inside the large-diameter punch 31. The top of the nitrogen spring 33 is bolted to the connecting block 5, and the bottom of the nitrogen spring 33 abuts against the top of the small-diameter punch 32. The bottom of the small-diameter punch 32 extends out of the bottom of the large-diameter punch 31.

[0025] It should be noted that the large-diameter punch 31 contacts the product 6 first, and the small-diameter punch 32 then completes precise stretching. The extension and retraction of the small-diameter punch 32 is dynamically controlled by the nitrogen spring 33, so that it extends to the inner diameter of the small diameter of the product 6 before stamping. When the small-diameter punch 32 is pressed against the inner diameter of the small end of the product 6, the small-diameter punch 32 begins to work to support the inner diameter and bottom surface of the small diameter of the product 6, avoiding the concentricity deviation caused by step-by-step stamping in traditional molds. The large-diameter punch 31 and the small-diameter punch 32 work synchronously to ensure that the cylindricity of the large diameter and small diameter of the product 6 is coaxial.

[0026] In an optional embodiment: the top outer walls of both the large-diameter punch 31 and the small-diameter punch 32 are integrally formed with an outer circular protrusion 34, and the inside of the fixing block 4 is provided with a stepped groove 41 that is adapted to the large-diameter punch 31. The inside of the large-diameter punch 31 is set as a stepped hole, which is used to accommodate the small-diameter punch 32 and the nitrogen spring 33.

[0027] It should be noted that the large-diameter punch 31 is precisely positioned by the outer circle protrusion 34 and the stepped groove 41 of the fixed block 4 to ensure no deviation during the stamping process. The internal stepped hole design provides a stable operating space for the small-diameter punch 32 and the nitrogen spring 33. The stepped groove 41 cooperates with the outer circle protrusion 34 to prevent the punch from tilting and ensure the verticality of the stamping.

[0028] In an optional embodiment: the die assembly 1 includes a pad 11, an abutting die 12 and a guiding die 13, the abutting die 12 being fixedly installed on the top of the pad 11 and the guiding die 13 being fixedly installed on the top of the abutting die 12.

[0029] It should be noted that the layered structure facilitates processing and maintenance. The guide die 13 ensures that the product 6 is accurately positioned before stamping. The guide die 13 guides the punch assembly 3 to be aligned with the product 6, reducing the scrap rate. Each layer can be replaced individually after wear, reducing maintenance costs.

[0030] In an optional embodiment: the lifting assembly 2 includes a connecting rod 21, a push rod 22 and an upper push block 23. The push rod 22 is fixedly installed on the top of the connecting rod 21 and is located inside the abutting die 12. The upper push block 23 is fixedly installed on the bottom of the connecting rod 21 and is used to connect the upper lifting mechanism of the press.

[0031] It should be noted that the lifting assembly 2 transmits the power of the upper lifting mechanism of the press to the ejector rod 22 through the connecting rod 21. The ejector rod 22 ejects the product 6 from inside the abutting die 12. The upper ejector block 23 cooperates with the groove 14 to ensure the stability of the ejection process. The ejector rod 22 acts directly on the bottom of the product to avoid deformation or mold jamming. The upper ejector block 23 is embedded in the groove 14 to prevent uneven load during lifting.

[0032] In an optional embodiment: the bottom of the pad block 11 is provided with a groove 14 that is adapted to the upper top block 23, and a connecting hole communicating with the interior of the abutting die 12 is provided at the center of the top of the groove 14. One end of the connecting rod 21 extends through the connecting hole to the interior of the abutting die 12.

[0033] It should be noted that the groove 14 and the connecting hole of the pad 11 provide movement space for the lifting assembly 2. The connecting rod 21 passes through the connecting hole and is linked with the top rod 22 to ensure accurate ejection stroke. The connecting hole restricts the movement path of the connecting rod 21 to prevent the top rod 22 from deviating.

[0034] In an optional embodiment, the small-diameter punch 32, the connecting rod 21, and the push rod 22 are all provided with exhaust holes for easy venting. The exhaust holes pass through the small-diameter punch 32, the connecting rod 21, and the push rod 22 axially to discharge the gas during the stamping process.

[0035] It should be noted that the vent hole runs through the small-diameter punch 32, connecting rod 21 and ejector rod 22, and discharges air from the mold cavity during stamping to prevent gas compression from causing surface defects in product 6, avoid cavitation or material accumulation, ensure smooth inner wall of product, reduce gas resistance, and make the punch assembly 3 move more smoothly.

[0036] Working principle: In this invention, product 6 is fed to the process by the conveying fingers. During operation, the large-diameter punch 31 first carries the product into the guiding die 13, and then the press continues to drive the punch downward. The extension and retraction of the small-diameter punch 32 is dynamically controlled by the nitrogen spring 33, so that it first extends to the inner diameter of the small diameter of product 6 before stamping. When the small-diameter punch 32 is against the inner diameter of the small end of product 6, the small-diameter punch 32 begins to work to support the inner diameter and bottom surface of the small diameter of product 6, avoiding the concentricity problems caused by step-by-step stamping in traditional molds. If there is a deviation, the press continues to press downwards. The small diameter punch 32 will exert an upward force, which pushes the nitrogen spring 33. The large diameter punch 31 supports the inner diameter of the product 6. When the bottom surfaces of the large and small diameters of the product 6 are pressed against the upper end of the die 12 and the ejector pin 22, the internal diameter work of the product 6 is completed. The large diameter punch 31 and the small diameter punch 32 work synchronously to ensure that the cylindricity of the large and small diameters of the product 6 is coaxial, thereby significantly improving the accuracy of the cylindricity of the inner diameter of the product 6 and meeting the production requirements of high-precision products.

[0037] After completion, the press drives the punch assembly 3 to rise and detach from the product 6. The upper ejector mechanism of the press drives the upper ejector block 23 to rise and insert into the groove 14. The top connecting rod 21 of the upper ejector block 23 drives the ejector rod 22 to eject the product 6 from the inside of the abutting die 12.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stamping and drawing die, characterized in that, The assembly includes a die assembly (1), a lifting assembly (2), a punch assembly (3), a fixing block (4), a connecting block (5), and a product (6). The punch assembly (3) is located above the die assembly (1) and is used to punch and stretch the inner diameter of the product (6) placed inside the die assembly (1). The lifting assembly (2) is located below the die assembly (1) and is used to eject the formed product (6) from the die assembly (1). The fixing block (4) is located on the outer side of the top of the punch assembly (3) and is used to install the punch assembly (3). The connecting block (5) is located on the top of the fixing block (4) and is used to connect to the power end of the press, so as to realize the punch assembly (3) to punch and stretch the inner diameter of the product (6) inside the die assembly (1) to achieve the cylindricity of the inner diameter.

2. The stamping and drawing die according to claim 1, characterized in that: The punch assembly (3) includes a large-diameter punch (31), a small-diameter punch (32), and a nitrogen spring (33). The large-diameter punch (31) is installed inside the fixing block (4), and the top of the large-diameter punch (31) is fixedly installed to the bottom of the connecting block (5). The small-diameter punch (32) and the nitrogen spring (33) are both installed inside the large-diameter punch (31). The top of the nitrogen spring (33) is bolted to the connecting block (5), and the bottom of the nitrogen spring (33) abuts against the top of the small-diameter punch (32). The bottom of the small-diameter punch (32) extends out of the bottom of the large-diameter punch (31).

3. A stamping and drawing die according to claim 2, characterized in that: The outer top walls of both the large-diameter punch (31) and the small-diameter punch (32) are integrally formed with an outer circular protrusion (34). The fixed block (4) has a stepped groove (41) that is compatible with the large-diameter punch (31). The interior of the large-diameter punch (31) is set with a stepped hole, which is used to accommodate the small-diameter punch (32) and the nitrogen spring (33).

4. A stamping and drawing die according to claim 2, characterized in that: The die assembly (1) includes a pad (11), an abutting die (12), and a guiding die (13). The abutting die (12) is fixedly installed on the top of the pad (11), and the guiding die (13) is fixedly installed on the top of the abutting die (12).

5. A stamping and drawing die according to claim 4, characterized in that: The lifting assembly (2) includes a connecting rod (21), a push rod (22), and an upper push block (23). The push rod (22) is fixedly installed on the top of the connecting rod (21) and is located inside the abutting die (12). The upper push block (23) is fixedly installed on the bottom of the connecting rod (21) and is used to connect the upper lifting mechanism of the press.

6. A stamping and drawing die according to claim 5, characterized in that: The bottom of the pad (11) is provided with a groove (14) that is compatible with the top block (23). The top of the groove (14) is provided with a connecting hole that communicates with the inside of the abutting die (12). One end of the connecting rod (21) extends through the connecting hole into the inside of the abutting die (12).

7. A stamping and drawing die according to claim 6, characterized in that: The small-diameter punch (32), the connecting rod (21), and the top rod (22) all have vent holes for easy venting. The vent holes penetrate the small-diameter punch (32), the connecting rod (21), and the top rod (22) along the axial direction to discharge the gas during the stamping process.

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