A male die for upsetting a non-threaded hole

Abstract

The utility model discloses a kind of male die of upsetting non-thread hole, including male die shell, punch pin and back pad, the male die shell one end is equipped with back pad assembly groove, the other end is equipped with punch pin assembly groove, the back pad assembly groove with The punch pin assembly groove is communicated, punch pin is set in the punch pin assembly groove, and the back pad is set in the back pad assembly groove inside.The application can replace corresponding punch pin according to the non-thread hole structure of the head of processing product, realize the upsetting of various non-thread hole structure;Different shape structure size alloy material processing needle body can be selected according to the non-thread hole structure size of the head of processing product, and the manufacturing cost is low, and it is easy to replace.The application can avoid the emergence of larger stress concentration when using, protect punch pin from being damaged, and the mold assembly life can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of fastener mold applications, specifically to a male mold for upsetting non-threaded cavities. Background Technology

[0002] Against the backdrop of the rapid upgrading of the intelligent manufacturing industry, key fields such as equipment manufacturing, aerospace, and new energy vehicles are continuously raising the performance requirements of core components. As a core basic component for mechanical connections, fasteners are showing an increasingly significant trend towards structural design and functional integration. Traditional fastener head types are mostly based on single structures such as hexagonal heads, dodecagonal heads, and flat round heads, which only meet basic connection and tightening needs and are no longer suitable for the lightweight and multifunctional assembly scenarios of modern equipment. To meet this development demand, the industry has gradually developed new types of fasteners with functional non-threaded cavity structures such as weight-reducing holes, wrench holes, and process holes. By integrating specific cavities into the head, these structures not only achieve weight reduction and energy saving, and optimize assembly space, but also assist in additional functions such as positioning, inspection, and heat dissipation, greatly expanding the application range of fasteners and becoming key supporting components in the field of high-end equipment manufacturing. However, when upsetting these types of functional non-threaded cavity structures, traditional upsetting dies face insurmountable technical bottlenecks and cost dilemmas. On the one hand, traditional dies are complex in their design for forming non-threaded cavities, requiring multiple complex processing steps to create the mold cavity. This not only increases manufacturing difficulty and production cycle but also leads to a significant increase in mold manufacturing costs, directly increasing the overall production cost of fasteners and squeezing the profit margins of enterprises. On the other hand, the structural strength and wear resistance of traditional dies are difficult to match the requirements of high-precision upsetting, and the die life is generally short, requiring frequent die replacements to ensure product quality, further exacerbating the problems of low production efficiency and cost waste. Particularly noteworthy is that when processing fasteners made of high-strength alloy materials (such as titanium alloys and high-temperature alloys), the high strength, high hardness, and low plasticity of these materials generate significant impact loads and frictional stresses on the male die head during the upsetting process. This makes traditional male die heads highly susceptible to sudden breakage or cracking, resulting in the direct scrapping of the male die. Specifically, in traditional processes, the punch and male die body are an integral structure (see reference). Figure 1 and Figure 2 When the punch is damaged, the entire punch and male mold body need to be replaced, which increases resource waste.

[0003] This high-frequency mold failure problem not only severely disrupts the continuous production process, but also significantly increases the mold replacement cost and product defect rate, becoming a core technical obstacle restricting the large-scale, high-quality production of functional non-threaded hole fasteners. Summary of the Invention

[0004] The purpose of this utility model is to address the problem of short lifespan of traditional upsetting dies when upsetting fasteners with head-mounted relief holes, wrench holes, process holes, etc., and to provide a male die for upsetting non-threaded cavities. This die is simple to process, low in cost, and has a long lifespan.

[0005] The technical solution of this utility model: A male die for upsetting non-threaded cavities includes a male die housing, a punch, and a rear pad. One end of the male die housing is provided with a rear pad assembly groove, and the other end is provided with a punch assembly groove. The rear pad assembly groove is connected to the punch assembly groove. A punch is disposed in the punch assembly groove, and the rear pad is disposed inside the rear pad assembly groove.

[0006] The male mold shell has a cylindrical shape, and the two ends of the cylindrical structure are rounded to transition to the side surface.

[0007] The punch includes a needle head and a needle body. The needle head has a through hole inside, and one end of the needle body is disposed in the through hole and is connected to the needle head by welding. The edges of the needle head are rounded.

[0008] One end of the punch near the needle head is located inside the rear pad assembly groove, and the other end extends through the punch assembly groove to the outside of the male mold housing.

[0009] The needle body includes a root, a body, and an impact part, which are integrally formed. The root is connected to the needle tip, and the impact part is connected to the root through the body.

[0010] The rear pad includes an integrally formed cylinder and an auxiliary correction frustum disposed on the cylinder.

[0011] The outer edge of the rear pad is rounded.

[0012] The beneficial effects of this utility model are: The upsetting male die of this application consists of a male die shell, a punch, and a backing pad. The punch can be replaced with the appropriate type to accommodate the non-threaded hole structure at the head of the product being processed, enabling upsetting of various non-threaded hole structures. The punch consists of a body and a tip welded together. Different alloy materials with varying shapes and sizes can be selected to process the punch body according to the dimensions of the non-threaded hole structure at the head of the product being processed, resulting in low manufacturing costs and easy replacement. During use, the punch and backing pad are inserted into the male die shell to form a male die body. The punch and male die body fit tightly together, preventing significant stress concentration. During upsetting, the backing pad and male die shell effectively reduce stress, protecting the punch from damage and significantly extending the lifespan of the die assembly.

[0013] In this application, the depth of the non-threaded hole can be indirectly adjusted by adjusting the thickness of the back pad according to the upset structure dimensions of the product. During upseting, the die assembly moves forward, the impact part of the pin contacts the upset product, and the upset product is stamped. The pin is subjected to a large upset resistance and the force is transmitted to the back pad and the male die housing, protecting the pin from damage. Even if the pin is damaged by large stress, the punch can be quickly replaced to continue processing, while the male die housing and back pad do not need to be replaced, effectively reducing costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a traditional positive mold; Figure 2 It is a cross-sectional view of a traditional male mold. Figure 3 This is a schematic diagram of the structure of the mold of this utility model; Figure 4 This is a cross-sectional structural diagram of the mold of this utility model; Figure 5 This is a cross-sectional view of the mold of this utility model. Figure 6 This is a schematic diagram of the structure of the punch of this utility model; Figure 7 This is a schematic diagram of the connection structure of the needle tip of this utility model cut open; Figure 8 This is a schematic diagram of the structure of the rear pad of this utility model; Figure 9 This is a cross-sectional structural diagram of the male mold shell of this utility model.

[0015] Reference numerals: 1-male mold shell, 2-punch, 3-rear pad, 4-rear pad assembly groove, 5-punch assembly groove, 6-needle head, 7-needle body, 8-through hole, 9-root, 10-body part, 11-impact part, 12-cylinder, 13-auxiliary correction frustum. Detailed Implementation

[0016] refer to Figures 3-9 A male mold for upsetting non-threaded cavities includes a male mold housing 1, a punch 2 and a rear pad 3. One end of the male mold housing 1 is provided with a rear pad assembly groove 4 and the other end is provided with a punch assembly groove 5. The rear pad assembly groove 4 is connected to the punch assembly groove 5. The punch 2 is disposed in the punch assembly groove 5 and the rear pad 3 is disposed inside the rear pad assembly groove 4.

[0017] The male mold housing 1 has a cylindrical shape, with rounded corners at both ends transitioning to the sides. This design serves two purposes: firstly, it avoids exposing sharp edges, reducing the risk of injury; secondly, as part of the stamping die assembly, the male mold housing 1 experiences significant impact during operation, and the rounded corners reduce stress concentration at its edges, dispersing stress and extending its service life.

[0018] The punch 2 includes a needle head 6 and a needle body 7. The needle head 6 has a through hole 8 inside. One end of the needle body 7 is disposed in the through hole 8 and is connected to the needle head 6 by welding. The edges of the needle head 6 are rounded.

[0019] The needle body 7 and the needle tip 6 are connected by welding, which facilitates the selection of the model of the needle body 7; at the same time, it improves the practicality of the needle tip 6.

[0020] The needle 6 moves inside the rear pad assembly groove 4. Its sharp edges can easily damage the side wall of the rear pad assembly groove 4, causing the needle 6 to wobble. This affects the machining accuracy of the needle body 7 on the product. However, by machining the sharp edges of the needle 6 with rounded corners, this phenomenon can be avoided.

[0021] The punch 2 is located inside the rear pad assembly groove 4 near the needle head 6, and the other end extends through the punch assembly groove 5 to the outside of the male mold housing 1.

[0022] The needle body 7 includes a root portion 9, a body portion 10, and an impact portion 11. The root portion 9, the body portion 10, and the impact portion 11 are integrally formed. The root portion 9 is connected to the needle tip 6, and the impact portion 11 is connected to the root portion 9 through the body portion 10.

[0023] In this application, the impact part 11 is the part that contacts the product. By changing the shape and structure of the impact part 11, a non-threaded cavity with a corresponding shape and structure can be formed. By adjusting the back pad 3, the length of the punch 2 that can be retracted into the through hole 8 can be adjusted, thereby adjusting the depth of the non-threaded cavity of the product.

[0024] The rear pad 3 includes an integrally formed cylinder 12 and an auxiliary correction frustum 13 disposed on the cylinder 12.

[0025] The main function of the rear pad 3 is to press and block the punch 2. In this application, by setting an auxiliary correction frustum 13, in conjunction with the limiting of the rear pad assembly groove 4, not only can the rear pad 3 move smoothly and linearly in the rear pad assembly groove 4, but the contact area between the rear pad 3 and the side wall of the rear pad assembly groove 4 can also be reduced, thereby reducing the mutual friction between the side wall of the rear pad assembly groove 4 and the rear pad 3, reducing damage, and improving the service life of the rear pad 3 and the male mold housing 1.

[0026] The outer edge of the rear pad 3 is rounded to transition. The rear pad 3 is a movable structure, and the sharp edges on the outer edge can easily scratch the inner wall of the rear pad mounting groove 4. Using rounded corners can reduce damage to the inner wall of the rear pad mounting groove 4. At the same time, the rear pad 3 is a load-bearing structure, and rounded corners reduce stress concentration at its corners, disperse stress, and extend the service life of the rear pad 3.

[0027] In this application, the needle body 7 is made of a high-strength material.

[0028] In this application, the needle body 7 can be made of different high-strength materials according to cost and strength requirements.

[0029] In this application, the high-strength material is tungsten steel, specifically including WF15, SKH55, G55, VA70, etc.

[0030] Tungsten steel has the following characteristics 1. Extremely high hardness and wear resistance Hardness is the most crucial characteristic of tungsten steel. At room temperature, its hardness can reach HRA 83-93 (Rockwell hardness), second only to diamond and cubic boron nitride, and far higher than ordinary steel (such as 45 steel with a hardness of about HRC 20-30).

[0031] It exhibits extremely high wear resistance and a low coefficient of friction, enabling it to maintain its shape for extended periods under conditions such as high-speed cutting, grinding, and impact, without easily wearing down. For example, cutting tools used for machining steel have a service life 5-10 times that of high-speed steel tools.

[0032] 2. High strength and rigidity It has extremely high compressive strength, reaching 3000-6000MPa, far exceeding that of ordinary steel (45 steel has a compressive strength of about 600MPa). It can withstand greater static pressure and is suitable for making stress-bearing components such as molds, punches, and rolls.

[0033] It has good rigidity (elastic modulus of about 450-650GPa), small deformation under stress, and high machining accuracy. It is often used as a cutting tool or fixture in high-precision machine tools.

[0034] 3. Excellent high temperature resistance It exhibits excellent thermal stability, maintaining high hardness and strength even at temperatures ranging from 500 to 800°C, without softening due to high temperatures. For example, during high-speed cutting, the cutting edge temperature can reach 600-700°C, yet tungsten steel can still function normally.

[0035] Compared to high-speed steel, tungsten steel has a higher heat resistance temperature (high-speed steel usually begins to soften above 500℃), making it suitable for processing difficult-to-machine materials such as heat-resistant steel and stainless steel.

[0036] As can be seen from the above characteristics of tungsten steel, using tungsten steel as the needle body of this application is the best choice.

[0037] Depending on actual needs, the needle body 7 can be made of a suitable material, which is not affected by the material of the needle tip 6, thus further extending the practicality of the needle tip 6 and the needle body 7.

[0038] The method of using the mold in this application includes the following steps: S1: Select a punch. Based on the shape and size of the product's forging structure, select a punch 2 of the corresponding shape and size. S2: Assemble the die assembly, insert the punch 2 into the male die housing 1, so that the needle body 7 passes through the punch assembly groove 5 and the needle head 6 remains in the rear pad assembly groove 4. Then, insert the rear pad 3 into the rear pad assembly groove 4 so that it contacts the punch 2 to obtain the die assembly. S3: Assemble and adjust, install the assembled die assembly onto the machine tool, and then adjust the thickness of backing 3 according to the structural dimensions of the upset product to control the depth of the upset non-threaded cavity; S4: For upsetting the product, start the machine tool, control the die assembly to move forward, the impact part 11 of the needle body 7 contacts the upsetting product, and stamps the upsetting product to obtain an upsetting product with a non-threaded hole.

[0039] The upsetting male die of this application consists of a male die shell 1, a punch 2, and a rear pad 3. The punch can be replaced according to the non-threaded hole structure of the product head, enabling upsetting of various non-threaded hole structures. The punch 2 is composed of a needle body 7 and a needle head 6 welded together. The needle body 7 can be machined from alloy materials of different shapes and sizes according to the dimensions of the non-threaded hole structure of the product head, resulting in low manufacturing costs and easy replacement. In use, the punch 2 and rear pad 3 are installed into the male die shell 1 to form a male die body. The punch 2 and the male die body fit tightly together, avoiding large stress concentrations. During upsetting, the rear pad and male die shell effectively reduce large stresses, protecting the punch from damage and effectively improving the lifespan of the die assembly.

[0040] In this application, the depth of the non-threaded hole can be indirectly adjusted by adjusting the thickness of the back pad 3 according to the upset structure dimensions of the product. During upseting, the die assembly moves forward, the impact part 11 of the pin 7 contacts the upset product, and presses the upset product. The pin 7 is subjected to a large upset resistance and the force is transmitted to the back pad 3 and the male die housing 1, protecting the pin 7 from damage. Even if the pin 7 is damaged by large stress, the punch 2 can be quickly replaced to continue processing, while the male die housing 1 and the back pad 3 do not need to be replaced, effectively reducing costs.

Claims

1. A male mold for upsetting non-threaded cavities, characterized in that... The device includes a male mold housing (1), a punch (2) and a rear pad (3). One end of the male mold housing (1) is provided with a rear pad assembly groove (4) and the other end is provided with a punch assembly groove (5). The rear pad assembly groove (4) is connected to the punch assembly groove (5). The punch (2) is provided in the punch assembly groove (5) and the rear pad (3) is provided inside the rear pad assembly groove (4).

2. The male mold for upsetting non-threaded cavities according to claim 1, characterized in that: The male mold shell (1) has a cylindrical shape, and the two ends of the cylindrical structure are rounded to transition to the side.

3. The male mold for upsetting non-threaded cavities according to claim 1, characterized in that: The punch (2) includes a needle head (6) and a needle body (7). The needle head (6) has a through hole (8) inside. One end of the needle body (7) is located in the through hole (8) and is connected to the needle head (6) by welding. The edges of the needle head (6) are rounded.

4. The male mold for upsetting non-threaded cavities according to claim 3, characterized in that: The punch (2) is located inside the rear pad assembly groove (4) near the needle head (6), and the other end extends through the punch assembly groove (5) to the outside of the male mold housing (1).

5. The male mold for upsetting non-threaded cavities according to claim 3, characterized in that: The needle body (7) includes a root (9), a body (10) and an impact part (11). The root (9), body (10) and impact part (11) are integrally formed. The root (9) is connected to the needle tip (6), and the impact part (11) is connected to the root (9) through the body (10).

6. The male mold for upsetting non-threaded cavities according to claim 1, characterized in that: The rear pad (3) includes an integrally formed cylinder (12) and an auxiliary correction frustum (13) disposed on the cylinder (12).

7. The male mold for upsetting non-threaded cavities according to claim 6, characterized in that: The outer edge of the rear pad (3) is rounded.

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