Hard alloy thin plate mold
By designing a die and upper/lower punch combination structure for cemented carbide thin plate molds, the forming difficulties and cracking problems of cemented carbide thin plates during the pressing process were solved, thereby improving the yield and production efficiency.
Patent Information
- Application Number
- CN202423029069.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-09
AI Technical Summary
Existing cemented carbide thin plate molds have problems such as difficulty in forming, easy deformation of products, easy cracking, and low yield during the pressing process, which is particularly obvious in the pressing of large-area thin plates.
A cemented carbide thin plate mold is designed, which adopts a combination structure of concave die and upper and lower punches with shrinkage coefficients of 1.26 and 1.23 respectively. Combined with a suitable square size design, it ensures the uniformity of the mixture and the pressing performance, reduces the pressure per unit area, and improves the powder loading balance.
It achieves product uniformity and flatness, reduces deformation, increases yield to over 99.5%, solves molding problems in the pressing process, and improves production efficiency and yield.
Smart Images
Figure CN223572008U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cemented carbide manufacturing technology, specifically a cemented carbide thin plate mold. Background Technology
[0002] Square dimensions: 280mm×280mm×3mm, material: YG6X alloy. Due to the large area and thin thickness of the product, and a single product weight of only 3.5KG, it is difficult to press into shape using standard methods. It requires a 2000-ton press, which places high demands on the uniformity of the mixture, the pressing performance, and the balance of powder loading. If the balance is not met, the sintered product will have large deformation, and cracks may easily appear in the middle or around the edges, or the outer square may be too small, resulting in an insufficient product size.
[0003] Due to the large area and thin thickness of the product, with a single product weight of only 3.5KG, the outdated approach of conventional pressing molds, which design both the outer dimensions and height based on a coefficient of 1.23, leads to difficulties in pressing and requires a 2000-ton press. This places high demands on the uniformity of the mixture, pressing performance, and even more so on the balance of powder loading. If the balance is not maintained, the sintered product will either be prone to cracks in the middle or around the edges, resulting in large dimensional deformation, or, due to the limited shrinkage coefficient of 1.23 for the pressing height, the outer dimensions of the product will become smaller, resulting in a product yield of only about 50%.
[0004] The information disclosed in the above background section is only intended to enhance the understanding of the overall background of this utility model, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Utility Model Content
[0005] To address the aforementioned shortcomings of existing molds, the purpose of this invention is to provide a cemented carbide thin plate mold. This ensures the pressed blank has sufficient strength and density, and prevents it from easily cracking.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A square mold for thin carbide plates includes a die, an upper punch, and a lower punch. The central groove of the die is square. The opposite surfaces of the upper and lower punches are both flat. The outer sides of the upper and lower punches are also square. The square dimensions of the upper and lower punches are adapted to the groove. The shrinkage coefficient of the die is designed to be 1.26, and the height compression shrinkage coefficient of the upper and lower punches is designed to be 1.23.
[0008] Furthermore, the height of the central groove is 3-5mm.
[0009] Furthermore, the side length of the square is 280-300mm.
[0010] Compared with the prior art, the present invention has the following beneficial effects:
[0011] This invention utilizes a square mold with a larger shrinkage coefficient for the outer shape. By adjusting the height of the pressed product (i.e., adjusting the shrinkage coefficient after determining the weight of the mold and the pressed product), the product dimensions can be adjusted. The outer shape is designed with a coefficient of 1.26, and the height is designed with a coefficient of 1.23. This design dilutes the pressure per unit area, reduces the requirement for uniformity of the mixture, and can even reduce the amount of molding compound by 20%. The pressed products are uniform, flat, and have minimal deformation, with outer dimensions generally in the range of 284-286. The problem of easy cracking is also solved due to the reduced actual operating pressure, resulting in a product yield of over 99.5%. Attached Figure Description
[0012] Figure 1 Here is a schematic diagram of the concave die structure of this utility model;
[0013] Figure 2 Here is a schematic diagram of the upward punching structure of this utility model;
[0014] Figure 3 Here is a schematic diagram of the lower punch structure of this utility model;
[0015] In the diagram, 1-die; 2-upper punch; 3-lower punch. Detailed Implementation
[0016] To explain the technical content, objectives, and effects of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings. In the description of these embodiments, it should be understood that terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing these embodiments and simplifying the description. They do not indicate or imply that the device or component 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 of this utility model.
[0017] like Figure 1-3 As shown, a square mold for thin carbide plates includes a cavity mold 1, an upper punch 2, and a lower punch 3. The central groove of the cavity mold 1 has a square structure. The opposite surfaces of the upper punch 2 and the lower punch 3 are both flat. The outer sides of the upper punch 2 and the lower punch 3 are also square. The square dimensions of the upper punch 2 and the lower punch 3 are adapted to the groove. The shrinkage coefficient of the cavity mold 1 is designed to be 1.26, and the height compression shrinkage coefficient of the upper punch 2 and the lower punch 3 is designed to be 1.23.
[0018] As a preferred embodiment of the above implementation, the height of the central groove is 3-5 mm.
[0019] As a preferred embodiment of the above implementation, the side length of the square is 280-300mm.
[0020] This utility model presents a novel mold design for thin-plate materials. The shrinkage coefficient for pressing the outer surface is designed to be 1.26, and the height pressing coefficient is designed to be 1.23. This not only achieved the experimental objectives but also overcame the difficulties in pressing and molding, which requires high uniformity of the mixture, high pressing performance, and even higher requirements for powder balance. It also addressed issues such as large deformation of the sintered product and the tendency for cracks to appear in the center or around the edges. This design addresses the pain points and difficulties in the large-scale production of packaged products, breaking through industry bottlenecks and challenges. In 2023, our company successfully produced 1090 thin plates (280mm*280mm*3mm), reducing production costs by 10% compared to previous methods, increasing the pass rate by 45% compared to using the old mold, and improving the on-time delivery rate by 50%.
[0021] Although the present invention has been described in detail above with specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.
Claims
1. A cemented carbide thin plate mold, characterized in that: It includes a die, an upper punch, and a lower punch. The central groove of the die is a square structure. The opposite surfaces of the upper and lower punches are both flat. The outer sides of the upper and lower punches are also square. The square dimensions of the upper and lower punches are adapted to the groove. The shrinkage coefficient of the die is designed to be 1.26, and the height compression shrinkage coefficient of the upper and lower punches is designed to be 1.
23.
2. The cemented carbide thin plate mold according to claim 1, characterized in that: The height of the central groove is 3-5mm.
3. The cemented carbide thin plate mold according to claim 1, characterized in that: The side length of the square is 280-300mm.