Embedded tungsten / molybdenum bar forging die
By adopting an insert design in the forging die, using high-hardness die inserts and optimizing the structure, the problem of short die life in existing dies has been solved, achieving low-cost and long-life forging results.
Patent Information
- Application Number
- CN202422886757.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-11-26
AI Technical Summary
When existing forging dies are used at high temperatures, it is difficult to achieve both low cost and long service life at the same time. In particular, the die inserts are prone to deformation and wear, resulting in a short overall die life.
The design employs an insert-type design, using mold inserts with a hardness HRC>36, such as Stellite alloy, NICRALC alloy, Nitromaxx alloy, or RR2450 alloy, combined with a 40Cr steel or H13 steel base, to optimize the structure and angles of the sizing zone, variable diameter zone, and inlet zone, thereby reducing material costs and extending mold life.
This approach reduces manufacturing costs, extends the service life of the mold, ensures a smooth and undamaged bar surface, and improves forging efficiency.
Smart Images
Figure CN223544020U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of metal deformation processing technology, and in particular to an inlaid tungsten / molybdenum bar forging die. Background Technology
[0002] Large-diameter tungsten and molybdenum rods are refractory metals, requiring forging dies for forging and drawing. Forging dies are essential and critical equipment in the production of tungsten and molybdenum rods. Forging of these rods occurs at high temperatures; for example, tungsten rods are forged in the range of 1200–1650℃, and molybdenum rods in the range of 900–1450℃. Furthermore, due to the high hardness and poor plasticity of tungsten and molybdenum rods, the forging process easily leads to die deformation and wear, shortening their service life and increasing costs. In production practice, forging costs are reduced by lowering die material costs and extending die life.
[0003] Existing forging dies generally consist of a die base and die inserts. The short lifespan of forging dies during use is due to deformation and wear on certain surface areas of the die inserts, rendering them unusable, while the majority of the die remains undamaged. However, existing forging dies are machined from a single piece of hot work die steel. Different hot work die steels have different prices and lifespans. For example, 40Cr steel has the lowest cost but the shortest lifespan, H13 steel is slightly more expensive but has a slightly longer lifespan, and Stellite alloy is the most expensive but has the longest lifespan. Therefore, existing forging dies cannot guarantee both low material costs and a long service life. Utility Model Content
[0004] To address the issue of how to provide a low-cost and long-lasting forging die for tungsten and molybdenum rods, this utility model provides an inlay-type forging die for tungsten / molybdenum rods.
[0005] This utility model provides an inlaid tungsten / molybdenum rod forging die, including a die body, which is composed of two die bases assembled together. Each die base has an arc-shaped groove on one end face, so that the two arc-shaped grooves form a closed working die hole at the center of the die body. The working die hole is divided into a fixed diameter area, a variable diameter area and an inlet area from the inside to the outside.
[0006] The mold base is inlaid with a mold insert, and the upper surface of the mold insert is provided with an arc-shaped surface, which coincides with the arc-shaped groove surface of the mold base and has the same curvature.
[0007] The mold insert is made of a metal with a hardness of HRC>36.
[0008] Furthermore, the mold insert is made of one of Stellite alloy, NICRALC alloy, Nitromaxx alloy or RR2450 alloy, and the mold base is made of 40Cr steel or H13 steel.
[0009] Furthermore, the mold insert is made of Stellite alloy, and the mold base is made of 40Cr steel.
[0010] Furthermore, the mold insert is installed in the mold base by welding.
[0011] Furthermore, the mold insert is located within the fixed diameter zone and the variable diameter zone.
[0012] Furthermore, the width of the mold insert in the sizing zone ranges from 46% to 100%, and the width of the mold insert in the variable diameter zone ranges from 80% to 100%.
[0013] Specifically, the mold insert occupies 46%-47% of the width of the sizing zone, and the mold insert occupies 90%-94% of the width of the variable diameter zone.
[0014] By adopting the above technical solution, the width range of the mold insert in the sizing zone is set to 46%-47%, and the width range of the mold insert in the variable diameter zone is set to 90%-94%, which aims to save materials and reduce costs.
[0015] Furthermore, the width ratio of the fixed diameter region, the variable diameter region, and the inlet region is 45-95:40-95:15-25.
[0016] Specifically, the width ratio of the fixed diameter zone, the variable diameter zone, and the inlet zone is 65:75:20.
[0017] Furthermore, the angle range of the inner wall of the variable diameter region along its extending direction is 4-10°, and the angle range of the inner wall of the variable diameter region along its extending direction is 25-35°.
[0018] Specifically, the angle range of the inner wall of the variable diameter region along its extending direction is 6°, and the angle range of the inner wall of the variable diameter region along its extending direction is 30°.
[0019] By adopting the above technical solution, by setting a certain angle between the inlet area and the diameter changing area, a certain degree of openness is ensured, which helps to dissipate heat and protects the bar from cracking in the sizing area.
[0020] Furthermore, the fillet radius between the sizing zone and the variable diameter zone is 45-55mm; the fillet radius between the variable diameter zone and the inlet zone is 8-12mm; and the fillet radius between the sizing zone and the end is 4-6mm.
[0021] Specifically, the fillet radius between the fixed-diameter area and the variable-diameter area is 50mm; the fillet radius between the variable-diameter area and the inlet area is 10mm; and the fillet radius between the fixed-diameter area and the end is 5mm.
[0022] By adopting the above technical solution, by setting the corners between each area to be rounded, it is ensured that the rod can be filled when deformed in the mold, avoiding damage caused by excessive extrusion.
[0023] Furthermore, the height of the mold insert is 40%-100% of the height of the mold base.
[0024] Specifically, the height of the mold insert is 40%-42% of the height of the mold base.
[0025] By adopting the above technical solution, the height of the insert is set to 40%-42% of the height of the mold base, which aims to save materials and reduce costs.
[0026] Furthermore, the surface roughness Ra of the working mold hole of the mold body is less than 1.6 μm, and the surface roughness Ra of the remaining surfaces is less than 3.2 μm.
[0027] It should be noted that those skilled in the art will know that Ra is the arithmetic mean roughness, which represents the average value of the absolute roughness over a reference length.
[0028] Compared with the prior art, the present invention provides an inlaid tungsten / molybdenum rod forging die, which reduces manufacturing costs and ensures the service life of the die by setting the working holes of the die in different areas and using a higher hardness material for the die inserts, and the surface of the forged rod is smoother.
[0029] In the preferred embodiment, by using lower-cost 40Cr steel or H13 steel for the mold base and higher-cost Stellite alloy for the mold inserts, the manufacturing cost is greatly reduced.
[0030] In the preferred solution, by setting the height and width ratio of the inlays, materials can be saved and costs reduced.
[0031] In the preferred embodiment, by setting rounded corners between each area, the deformation of the bar within the mold can be filled, avoiding damage caused by excessive extrusion.
[0032] In the preferred embodiment, by setting a certain angle between the inlet area and the diameter-changing area, a certain degree of openness is ensured, which helps to dissipate heat and protects the bar from cracking in the sizing area. Attached Figure Description
[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0034] Figure 1 This is a front view of the inlaid tungsten / molybdenum bar forging die provided by this utility model;
[0035] Figure 2 A top view of a mold base for an inlaid tungsten / molybdenum bar forging mold provided by this utility model;
[0036] Figure 3 A partial cross-sectional view of the BB section of a mold base for an inlaid tungsten / molybdenum bar forging mold provided by this utility model.
[0037] Figure label:
[0038] Detailed Implementation
[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0040] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0041] This invention provides a low-cost and long-life embedded tungsten / molybdenum rod forging die.
[0042] like Figure 1As shown, the present invention provides an inlaid tungsten / molybdenum rod forging die, including a die body 10, which is composed of two die bases 20 assembled together. Each die base 20 has an arc-shaped groove on one end face, so that the two arc-shaped grooves form a closed working die hole 30 at the center of the die body 10. The working die hole 30 is divided into a sizing area 31, a variable diameter area 32 and an inlet area 33 from the inside to the outside.
[0043] The mold base 20 is inlaid with a mold insert 40. The upper surface of the mold insert 40 is provided with an arc-shaped surface, which coincides with the arc-shaped groove surface of the mold base 20 and has the same curvature.
[0044] The mold insert 40 is made of a metal with a hardness of HRC>36.
[0045] The mold insert 40 is made of one of Stellite alloy, NICRALC alloy, Nitromaxx alloy or RR2450 alloy, and the mold base 20 is made of 40Cr steel or H13 steel.
[0046] In one specific embodiment, the mold insert 40 is made of Stellite alloy, and the mold base 20 is made of 40Cr steel.
[0047] Specifically, during use, the tungsten / molybdenum rod enters from the inlet area 33, and is extruded and shaped through the diameter changing area 32 and the sizing area 31, so that the tungsten / molybdenum rod becomes the appropriate size.
[0048] Preferably, the mold insert 40 is installed in the mold base 20 by welding.
[0049] In one specific embodiment, such as Figure 2 and Figure 3 As shown, the mold insert 40 is located within the fixed diameter zone 31 and the variable diameter zone 32.
[0050] Preferred, such as Figure 2 As shown, the mold insert 40 occupies 46%-100% of the width of the sizing region 31, and the mold insert 40 occupies 80%-100% of the width of the variable diameter region 32.
[0051] In one specific embodiment, the mold insert 40 occupies 46%-47% of the width of the sizing region 31, and the mold insert 40 occupies 90%-94% of the width of the variable diameter region 32.
[0052] Preferred, such as Figure 2 As shown, the width ratio of the fixed diameter region 31, the variable diameter region 32, and the inlet region 33 is 45-95:40-95:15-25.
[0053] In one specific embodiment, the width ratio of the fixed diameter region 31, the variable diameter region 32, and the inlet region 33 is 65:75:20.
[0054] Preferred, such as Figure 2 As shown, the angle range of the inner wall of the variable diameter region 32 along its extending direction is 4-10°, and the angle range of the inner wall of the variable diameter region 32 along its extending direction is 25-35°.
[0055] In one specific embodiment, the angle range of the inner wall of the variable diameter region 32 along its extending direction is 6°, and the angle range of the inner wall of the variable diameter region 32 along its extending direction is 30°.
[0056] Preferred, such as Figure 2 As shown, the fillet radius between the fixed diameter area 31 and the variable diameter area 32 is 45-55mm; the fillet radius between the variable diameter area 32 and the inlet area 33 is 8-12mm; and the fillet radius between the fixed diameter area 31 and the end is 4-6mm.
[0057] In one specific embodiment, the fillet radius between the sizing region 31 and the variable diameter region 32 is 50 mm; the fillet radius between the variable diameter region 32 and the inlet region 33 is 10 mm; and the fillet radius between the sizing region 31 and the end is 5 mm.
[0058] Preferred, such as Figure 2 As shown, the height of the mold insert 40 is 40%-100% of the height of the mold base 20.
[0059] In one specific embodiment, the height of the mold insert 40 is 40%-42% of the height of the mold base 20.
[0060] Preferably, the surface roughness Ra of the working mold hole 30 of the mold body 10 is less than 1.6 μm, and the surface roughness Ra of the remaining surfaces is less than 3.2 μm.
[0061] Although this document frequently uses terms such as mold base, mold insert, sizing zone, reducing zone, and entry zone, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.
[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. An inlaid tungsten / molybdenum bar forging die, characterized in that: The mold body (10) is composed of two mold bases (20). Each mold base (20) has an arc-shaped groove on one end face, so that the two arc-shaped grooves form a closed working mold hole (30) at the center of the mold body (10). The working mold hole (30) is divided into a fixed diameter area (31), a variable diameter area (32) and an inlet area (33) from the inside to the outside. The mold base (20) is inlaid with a mold insert (40), and the upper surface of the mold insert (40) is provided with an arc surface, which coincides with the arc groove surface of the mold base (20) and has the same curvature. The mold insert (40) is made of a metal material with a hardness of HRC>36.
2. The inlaid tungsten / molybdenum bar forging die according to claim 1, characterized in that: The mold insert (40) is made of one of Stellite alloy, NICRALC alloy, Nitromaxx alloy or RR2450 alloy, and the mold base (20) is made of 40Cr steel or H13 steel.
3. The inlaid tungsten / molybdenum bar forging die according to claim 1, characterized in that: The mold insert (40) is installed in the mold base (20) by welding.
4. The inlaid tungsten / molybdenum bar forging die according to claim 1, characterized in that: The mold insert (40) is located within the fixed diameter zone (31) and the variable diameter zone (32).
5. The inlaid tungsten / molybdenum bar forging die according to claim 1, characterized in that: The mold insert (40) occupies 46%-100% of the width of the sizing zone (31), and the mold insert (40) occupies 80%-100% of the width of the variable zone (32).
6. The inlaid tungsten / molybdenum bar forging die according to claim 1, characterized in that: The width ratio of the fixed diameter area (31), the variable diameter area (32), and the entrance area (33) is 45-95:40-95:15-25.
7. The inlaid tungsten / molybdenum bar forging die according to claim 1, characterized in that: The angle range of the inner wall of the variable diameter region (32) along its extension direction is 4-10°, and the angle range of the inner wall of the variable diameter region (32) along its extension direction is 25-35°.
8. The inlaid tungsten / molybdenum bar forging die according to claim 1, characterized in that: The fillet radius between the fixed diameter area (31) and the variable diameter area (32) is 45-55mm; the fillet radius between the variable diameter area (32) and the inlet area (33) is 8-12mm; and the fillet radius between the fixed diameter area (31) and the end is 4-6mm.
9. The inlaid tungsten / molybdenum bar forging die according to claim 1, characterized in that: The height of the mold insert (40) is 40%-100% of the height of the mold base (20).
10. The inlaid tungsten / molybdenum bar forging die according to claim 1, characterized in that: The surface roughness Ra of the working mold hole (30) of the mold body (10) is less than 1.6 μm, and the surface roughness Ra of the rest is less than 3.2 μm.