A cold isostatic pressing rubber mold for tungsten powder molding

Abstract

This utility model discloses a cold isostatic pressing rubber mold for tungsten powder molding, relating to the field of tungsten powder molding technology. It includes a mold body with an internal cavity, a mold plug fitted at the open end of the mold body, and L1, L2, and L3 segments sequentially arranged along the axial direction on the side of the mold body. The L1 segment has an arc-shaped convex hollow cylindrical structure, the L2 segment has a cylindrical hollow structure, and the L3 segment, at its furthest point from the mold plug, has a hemispherical hollow structure. This utility model provides a cold isostatic pressing rubber mold for tungsten powder molding. By enhancing the resilience of the middle part, it reduces surface cracks in the blank and improves the service life of the mold. The L1 segment with its arc-shaped convex hollow cylindrical structure enhances the strength of the mold body, and the mold plug has an inwardly concave arc-shaped structure to prevent cracking or bursting of the blank during blank opening, greatly improving the product qualification rate, reducing production costs, and increasing the economic benefits of the enterprise.

Description

Technical Field

[0001] This utility model relates to the field of tungsten powder molding technology, specifically a cold isostatic pressing rubber mold for tungsten powder molding. Background Technology

[0002] Cold isostatic pressing (CIP) technology is widely used because it can produce compacts with high relative density and low residual stress in one step. In the CIP process of tungsten powder molding, rubber or polyurethane elastic sleeves are used to transmit pressure in all directions. However, when pressing high-hardness tungsten powder, ordinary rubber sleeves become less elastic in the middle when reused, resulting in insufficient resilience and making the surface of the compact prone to cracking and breakage. Furthermore, the number of times the sleeve can be reused is low, and the proportion of the compacted material that bursts and cracks during blanking is high.

[0003] Therefore, to address global production challenges, it is necessary to improve existing molds to increase yield and reduce production costs. This requires enhancing the resilience of the intermediate sections to effectively reduce surface cracks in the blank, extend mold lifespan, and thereby improve overall production efficiency and product quality, reduce production costs, and increase corporate economic benefits. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by providing a cold isostatic pressing rubber mold sleeve for tungsten powder molding. By enhancing the resilience of the middle part, it effectively reduces surface cracks in the blank and improves the service life of the mold sleeve, thereby enhancing overall production efficiency and product quality. The mold sleeve body is provided with an L1 section with an arc-shaped convex hollow cylindrical structure, which can enhance the strength of the mold sleeve body and avoid mold wall failure during cold isostatic pressing, thus preventing demolding difficulties. A mold plug is provided with a concave arc structure, which can prevent the blank produced by cold isostatic pressing from having right angle structures, thereby solving the problem of cracking or bursting of the blank during subsequent blank opening, greatly improving the product qualification rate, reducing the scrap rate, reducing the scrap rate of the mold sleeve body, reducing production costs, and improving the economic benefits of the enterprise.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A cold isostatic pressing rubber mold for tungsten powder molding includes a mold body with a cavity inside for containing tungsten powder. A mold plug is fitted at the open end of the mold body. Sections L1, L2, and L3 are sequentially arranged along the axial direction on the side of the mold body. Section L1 has an arc-shaped convex hollow cylindrical structure, and section L2 has a cylindrical hollow structure. The farthest end of section L3 from the mold plug has a hemispherical hollow structure. The outer wall of section L1 and the outer walls of its two sides form an angle α, and the outer walls of sections L2 and L3 form an angle β.

[0006] As a further improvement to the above scheme, the wall thickness of the L1 section of the mold body near the mold plug side is 1.5mm.

[0007] As a further improvement to the above scheme, the wall thickness of the L1 section on the mold body is 1.5-2mm.

[0008] As a further improvement to the above scheme, the wall thickness of sections L2 and L3 on the mold body is 1.5mm.

[0009] As a further improvement to the above scheme, the radius R1 of the inner wall of the farthest end of the L3 segment on the mold body away from the mold plug is 12-13mm.

[0010] As a further improvement to the above solution, the end of the mold plug facing the mold sleeve body is configured as a concave arc-shaped structure.

[0011] As a further improvement to the above scheme, the included angle α on the mold body is 10°.

[0012] As a further improvement to the above scheme, the included angle β on the mold body is 4°.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: By enhancing the resilience of the middle part, surface cracks of the blank are effectively reduced, and the service life of the die sleeve is improved, thereby improving overall production efficiency and product quality. The die sleeve body is provided with an L1 section with an arc-shaped convex hollow cylindrical structure, which can enhance the strength of the die sleeve body and avoid the phenomenon of mold wall failure and demolding difficulty during cold isostatic pressing. A die plug is provided with a concave arc structure, which can prevent the blank produced by cold isostatic pressing from right angle structure, thereby solving the problem of cracking or bursting of the blank during subsequent blank opening, greatly improving the product qualification rate, reducing the scrap rate, reducing the scrap rate of the die sleeve, reducing production costs, and improving the economic benefits of the enterprise. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0015] Figure 2 This is a partially enlarged schematic diagram of the L3 segment of the mold body in this utility model.

[0016] The text labels in the figure represent: 1. Mold plug; 2. Mold body; 3. Cavity. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution, the present invention will be described in detail below with reference to the embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0018] like Figures 1-2 As shown, the specific solution of this embodiment is as follows: a cold isostatic pressing rubber mold for tungsten powder molding, including a mold body 2, a cavity 3 for accommodating tungsten powder is provided inside the mold body 2, a mold plug 1 is matched at the open end of the mold body 2, and L1, L2 and L3 segments are arranged sequentially along the axial direction on the side of the mold body 2. The L1 segment has an arc-shaped convex hollow cylindrical structure, the L2 segment has a cylindrical hollow structure, and the farthest end of the L3 segment away from the mold plug 1 has a hemispherical hollow structure. The outer wall of the L1 segment and the outer walls of its two sides form an angle α, and the outer walls of the L2 segment and the L3 segment form an angle β.

[0019] More specifically, the L1 section on the mold sleeve 2 is an arc-shaped convex hollow cylindrical structure, which can increase the wall thickness, alleviate stress concentration, enhance the strength of the mold sleeve 2, and avoid mold wall failure and demolding difficulties during cold isostatic pressing. A mold plug 1 is provided, which has an inwardly concave arc structure, so that the blank produced by cold isostatic pressing avoids right-angle structures, thereby solving the problem of cracking or bursting of the blank during subsequent blank opening, greatly improving the product qualification rate, reducing the scrap rate, reducing the scrap rate of the mold sleeve 2, reducing production costs, and improving the economic benefits of the enterprise.

[0020] like Figures 1-2 As shown, in a preferred embodiment of the above embodiment, the wall thickness of the L1 section of the mold body 2 near the side of the mold plug 1 is 1.5mm.

[0021] like Figures 1-2 As shown, in a preferred embodiment of the above, the wall thickness of section L1 on the mold body 2 is 1.5-2mm.

[0022] like Figures 1-2 As shown, in a preferred embodiment of the above embodiment, the wall thickness of sections L2 and L3 on the mold body 2 is 1.5mm.

[0023] like Figures 1-2 As shown, in a preferred embodiment, the radius R1 of the inner wall of the farthest end of the L3 segment on the mold body 2 away from the mold plug 1 is 12-13 mm.

[0024] like Figures 1-2 As shown, in a preferred embodiment, the end of the mold plug 1 facing the mold sleeve 2 is configured as a concave arc-shaped structure.

[0025] like Figures 1-2 As shown, in a preferred embodiment of the above embodiment, the included angle α on the mold body 2 is 10°.

[0026] like Figures 1-2 As shown, in a preferred embodiment of the above embodiment, the angle of the β angle on the mold body 2 is 4°.

[0027] The specific working principle of this utility model is as follows: Remove the mold plug 1, fill the cavity 3 with tungsten powder according to the predetermined powder density, and then press the mold plug 1 back in. The entire mold assembly is placed in the pressure vessel of the cold isostatic pressing device, and the medium applies pressure in all directions. The L1 section on the mold body 2 is an arc-shaped convex hollow cylindrical structure, which can increase the wall thickness, alleviate stress concentration, enhance the strength of the mold body 2, and avoid mold wall failure during the cold isostatic pressing operation, thus preventing the phenomenon of difficult demolding. The mold plug 1 is provided with an inwardly concave arc structure, which can prevent the blank produced by the cold isostatic pressing operation from having right-angle structures, thereby solving the problem of cracking or bursting of the blank during subsequent blank opening, greatly improving the product qualification rate, reducing the scrap rate, reducing the scrap rate of the mold body 2, reducing production costs, and improving the economic benefits of the enterprise. It should be noted that, in this document, the terms "including," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the present invention. These examples are merely for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the present invention to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A cold isostatic pressing rubber mold sleeve for tungsten powder molding, characterized in that, The mold includes a mold body (2), and a cavity (3) is provided inside the mold body (2) to accommodate tungsten powder. A mold plug (1) is matched at the open end of the mold body (2). The side of the mold body (2) is provided with L1, L2 and L3 segments in sequence along the axial direction. The L1 segment is an arc-shaped convex hollow cylindrical structure, the L2 segment is a cylindrical hollow structure, and the farthest end of the L3 segment away from the mold plug (1) is a hemispherical hollow structure. The outer wall of the L1 segment and the outer walls of its two sides form an angle α, and the outer walls of the L2 segment and the L3 segment form an angle β.

2. The cold isostatic pressing rubber mold sleeve for tungsten powder molding according to claim 1, characterized in that, The wall thickness of the L1 section of the mold body (2) near the side of the mold plug (1) is 1.5mm.

3. The cold isostatic pressing rubber mold sleeve for tungsten powder molding according to claim 1, characterized in that, The wall thickness of the L1 section on the mold body (2) is 1.5-2mm.

4. The cold isostatic pressing rubber mold sleeve for tungsten powder molding according to claim 1, characterized in that, The wall thickness of the L2 and L3 sections of the mold body (2) is 1.5mm.

5. A cold isostatic pressing rubber mold sleeve for tungsten powder molding according to claim 1, characterized in that, The radius R1 of the inner wall of the farthest end of the L3 segment of the mold body (2) away from the mold plug (1) is 12-13mm.

6. A cold isostatic pressing rubber mold sleeve for tungsten powder molding according to claim 1, characterized in that, The end of the plug (1) facing the mold body (2) is configured as a concave arc-shaped structure.

7. A cold isostatic pressing rubber mold sleeve for tungsten powder molding according to claim 1, characterized in that, The included angle α on the mold body (2) is 10°.

8. A cold isostatic pressing rubber mold sleeve for tungsten powder molding according to claim 1, characterized in that, The angle of the β angle on the mold body (2) is 4°.

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