Wet cold isostatic pressing die

Abstract

The utility model discloses a wet process cold isostatic pressing die, which belongs to the technical field of dies, and comprises a hollow rubber sleeve, an upper rubber plug, a lower rubber plug and a steel core, the steel core is arranged in the rubber sleeve, an upper limit blind hole is arranged in the upper rubber plug, the upper limit blind hole is matched with the side wall of the upper end of the steel core, and the lower limit blind hole is matched with the side wall of the lower end of the steel core. A lower limiting blind hole is formed in the lower rubber plug and matched with the side wall of the lower end of the steel core, the outer side wall of the upper rubber plug is matched with the inner side wall of the upper end of the rubber sleeve, and the outer side wall of the lower rubber plug is matched with the inner side wall of the lower end of the rubber sleeve. And a positioning piece for ensuring the steel core to be vertical during powder filling is also arranged in the rubber sleeve. By arranging the positioning piece, when powder is added into the cavity formed by the rubber sleeve and the lower rubber plug, the steel core can be positioned, it is guaranteed that the steel core is in a vertical state, and by arranging the upper rubber plug and the lower rubber plug which are matched with the upper end and the lower end of the rubber sleeve, water is prevented from entering the isostatic cool pressing process.

Description

TECHNICAL FIELD

[0001] The utility model relates to mould technical field, especially a kind of wet cold isostatic pressing mould. BACKGROUND

[0002] When powder is dry-pressed into shape by steel mould, there is a problem of uneven pressure in the pressing direction, which is generally compensated by isostatic pressing technology or directly formed by isostatic pressing technology.

[0003] Isostatic pressing technology is a technology for forming products in a sealed high-pressure container under the condition of uniform ultra-high pressure in all directions, mainly applied to powder forming in powder metallurgy and widely used in the field of ceramic casting. According to the temperature during forming and consolidation, isostatic pressing technology is divided into three different types: cold isostatic pressing, warm isostatic pressing and hot isostatic pressing. Cold isostatic pressing is used for powder material forming at room temperature with liquid as pressure medium, providing a body for further sintering, manufacturing or hot isostatic pressing process. Cold isostatic pressing is divided into wet and dry types. In wet cold isostatic pressing, powder is sealed in a mould, and after sealing, it is put into a high-pressure container, and liquid pressure medium is directly injected into the container to contact the powder, and the incompressible and uniform pressure transmission properties of the liquid medium are used to uniformly press the powder from all directions to form a dense compact.

[0004] The existing wet cold isostatic pressing forming technology mostly uses polyurethane or rubber as the mould, which does not have enough supporting force to make the steel core vertical when making hollow pipe, resulting in poor concentricity. The steel core of the hollow pipe mould is mostly exposed or embedded in the rubber plug, and the exposed type has two water inlet points, while the embedded type has the risk of water entering when compressed against the rubber plug. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a wet cold isostatic pressing mould to solve the problem in the background art.

[0006] In order to solve the above technical problems, the technical scheme of the utility model is as follows:

[0007] A wet cold isostatic pressing mould, comprising a rubber sleeve hollow in the up-down direction, an upper rubber plug, a lower rubber plug and a steel core, the steel core is arranged in the rubber sleeve, the upper rubber plug is provided with an upper limiting blind hole, the upper limiting blind hole cooperates with the upper end side wall of the steel core, the lower rubber plug is provided with a lower limiting blind hole, the lower limiting blind hole cooperates with the lower end side wall of the steel core, the outer side wall of the upper rubber plug cooperates with the inner side wall of the upper end of the rubber sleeve, the outer side wall of the lower rubber plug cooperates with the inner side wall of the lower end of the rubber sleeve, and the rubber sleeve is further provided with a positioning member for ensuring the verticality of the steel core when filling powder.

[0008] Preferably, the positioning member comprises an outer ring and an inner ring, the outer ring and the inner ring are connected through a plurality of connecting rods, the outer side wall of the outer ring is matched with the inner side wall of the rubber sleeve, and the inner side wall of the inner ring is matched with the outer side wall of the steel core.

[0009] Preferably, the thickness of the rubber sleeve is 4-10mm, the pressure resistance strength is 50Mpa-250Mpa, and the rubber sleeve is made of rubber.

[0010] Preferably, the height of the upper rubber plug is equal to the height of the lower rubber plug, the height of the upper rubber plug is 45-55mm, the depth of the upper limiting blind hole is equal to the depth of the lower limiting blind hole, and the depth of the upper limiting blind hole is 30-40mm.

[0011] Preferably, the preparation material of the steel core is 316 stainless steel or die steel.

[0012] The above technical scheme has the following beneficial effects:

[0013] The positioning member is arranged, so that the steel core can be positioned and kept in a vertical state when the powder is added into the cavity formed by the rubber sleeve and the lower rubber plug, and the upper rubber plug and the lower rubber plug are arranged in cooperation with the upper end and the lower end of the rubber sleeve, thereby avoiding water inflow during cold isostatic pressing. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a sectional view structure schematic diagram of the wet cold isostatic pressing mold of the utility model;

[0015] Figure 2 It is a structure schematic diagram of the positioning member of the utility model;

[0016] Figure 3 It is a sectional view structure schematic diagram of the cooperation of the positioning member, the rubber sleeve and the steel core;

[0017] Figure 4 It is Figure 3 It is an enlarged structure schematic diagram of A. DETAILED DESCRIPTION

[0018] The specific embodiments of the utility model will be further described below in combination with the drawings. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute the limitation of the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0019] Reference Figures 1-4The wet cold isostatic pressing mold comprises a rubber sleeve 1 hollow in the up-down direction, an upper rubber plug 2, a lower rubber plug 3 and a steel core 4, the steel core 4 is arranged in the rubber sleeve 1, the upper rubber plug 2 is provided with an upper limiting blind hole 5, the upper limiting blind hole 5 cooperates with the upper end side wall of the steel core 4, the lower rubber plug 3 is provided with a lower limiting blind hole 6, the lower limiting blind hole 6 cooperates with the lower end side wall of the steel core 4, the outer side wall of the upper rubber plug 2 cooperates with the inner side wall of the upper end of the rubber sleeve 1, the outer side wall of the lower rubber plug 3 cooperates with the inner side wall of the lower end of the rubber sleeve 1, and the rubber sleeve 1 is further provided with a positioning member 7 for ensuring the verticality of the steel core 4 when filling powder.

[0020] Specifically, the upper rubber plug 2 and the lower rubber plug 3 are completely the same in size to save cost, the steel core 4 is in a cylindrical structure, the central axis thereof coincides with the central axis of the hollow cylindrical rubber sleeve 1, and the positioning member 7 is arranged to ensure the coincidence of the central axes of the two in use, thereby solving the problem that the existing technology does not have enough supporting force to make the steel core vertical when making a hollow pipe, resulting in poor concentricity, and making the steel core 4 vertical to the ground by arranging the positioning member 7.

[0021] By arranging the upper rubber plug 2 and the lower rubber plug 3 and inserting them into the two ends of the rubber sleeve 1 in use, the upper limiting blind hole 5 and the lower limiting blind hole 6 are arranged to cooperate with the two ends of the steel core 4, thereby solving the problem that the steel core of the hollow pipe mold is mostly exposed or embedded in the rubber plug in the prior art, the exposed type has two more water inlet points, and the embedded type has the risk of water inlet when pressing against the rubber plug.

[0022] In use, the lower rubber plug 3 is first arranged in cooperation with the rubber sleeve 1, the rubber sleeve 1 is vertically placed after installation, the lower rubber plug 3 is located at the lower end, then the lower end of the steel core 4 is inserted into the lower limiting blind hole 6, the positioning member 7 is arranged at the upper end of the steel core 4 after the installation of the steel core 4 in the lower limiting blind hole 6, the steel core 4 is kept vertical by arranging the positioning member 7, the concentricity with the rubber sleeve 1 is kept, then the space formed by the steel core 4 and the rubber sleeve 1 is filled with powder, the positioning member 7 is taken out after the powder is added to the required height, and the upper rubber plug 2 is arranged in the rubber sleeve 1.

[0023] In some embodiments, the positioning member 7 comprises an outer ring 8 and an inner ring 9, the outer ring 8 and the inner ring 9 are connected through a plurality of connecting rods 10, the outer side wall of the outer ring 8 cooperates with the inner side wall of the rubber sleeve 1, and the inner side wall of the inner ring 9 cooperates with the outer side wall of the steel core 4.

[0024] Specifically, the positioning member 7 is used to make the outer side wall of the outer ring 8 fit and adhere to the inner side wall of the rubber sleeve 1, and the side wall of the inner ring 9 fit and adhere to the outer side wall of the upper end of the steel core 4, thereby limiting the position of the steel core 4 and keeping the steel core 4 upright. After filling the powder, it can be taken out. Specifically, the positioning member 7 can be made of metal material. If it is made of metal material, it can be taken out of the rubber sleeve 1 after positioning is completed. In other embodiments of the present embodiment, the material of the positioning member can also be the same as the material of the rubber sleeve 1. At this time, the positioning member 7 can be used to limit the position of the steel core. It can be fixedly connected with the inner side wall of the rubber sleeve 1. After positioning is completed, the upper rubber plug 2 is installed. After the upper rubber plug 2 is installed, the bottom side wall of the upper rubber plug 2 is in contact with the positioning member 7. The positioning member 7 does not need to be specially disassembled.

[0025] In some embodiments, the thickness of the rubber sleeve 1 is 4-10mm, the pressure resistance is 50Mpa-250Mpa, and the rubber sleeve 1 is made of rubber.

[0026] Specifically, the thickness of the rubber sleeve 1 is 4mm or 10mm, and the pressure resistance is 50Mpa or 250Mpa. The actual thickness and pressure resistance can be selected according to requirements. The rubber sleeve 1 is made of rubber. The rubber sleeve 1 is formed by a whole process to avoid the edge problem caused by the bonding process.

[0027] In some embodiments, the height of the upper rubber plug 2 is equal to the height of the lower rubber plug 3. The height of the upper rubber plug 2 is 45-55mm. The depth of the upper limiting blind hole 5 is equal to the depth of the lower limiting blind hole 6. The depth of the upper limiting blind hole 5 is 30-40mm.

[0028] Specifically, the height of the upper rubber plug 2 is equal to the height of the lower rubber plug 3. Both need to be inserted into the rubber sleeve 1, so the size is also equal. The depth of the upper limiting blind hole 5 is equal to the depth of the lower limiting blind hole 6. The size of the two is consistent to facilitate manufacturing. The height of the upper rubber plug 2 and the lower rubber plug 3 is 45mm or 55mm. The depth of the upper limiting blind hole 5 and the lower limiting blind hole 6 is 30mm or 40mm. The specific size is selected according to requirements. The upper rubber plug 2 and the lower rubber plug 3 are made of rubber material with a Mohs hardness of 5-10 higher than that of the rubber sleeve 1.

[0029] In some embodiments, the material of the steel core 4 is 316 stainless steel or die steel to ensure that it will not deform under the highest pressure of 250Mpa and meet the requirements of cold isostatic pressing. When the steel core 4 is installed, the distance between the upper end of the steel core 4 and the bottom of the upper limiting blind hole 5 is 5-10mm, or the distance between the lower end of the steel core 4 and the bottom of the lower limiting blind hole 6 is 5-10mm. A certain length direction space is reserved. Specifically, when the length of the steel core 4 is designed, the distance between the bottom of the upper limiting blind hole 5 and the bottom of the lower limiting blind hole 6 can be 5-10mm larger than the length of the steel core 4 after the upper rubber plug 2 and the lower rubber plug 3 are installed.

[0030] The application can position the steel core 4 when the powder is added into the cavity formed by the rubber sleeve 1 and the lower rubber plug 3, ensure that the steel core 4 is in a vertical state, ensure the coaxial degree of the steel core 4 and the rubber sleeve 1, and avoid water from entering in the process of cold isostatic pressing by setting the upper rubber plug 2 and the lower rubber plug 3 which are matched with the upper and lower ends of the rubber sleeve 1.

[0031] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the utility model, and still fall within the protection scope of the utility model.

Claims

1. A wet-process cold isostatic pressing mold, characterized in that, The device includes a hollow rubber sleeve (1), an upper rubber plug (2), a lower rubber plug (3), and a steel core (4). The steel core (4) is disposed in the rubber sleeve (1). The upper rubber plug (2) has an upper limit blind hole (5) that engages with the upper side wall of the steel core (4). The lower rubber plug (3) has a lower limit blind hole (6) that engages with the lower side wall of the steel core (4). The outer side wall of the upper rubber plug (2) engages with the inner side wall of the upper end of the rubber sleeve (1). The outer side wall of the lower rubber plug (3) engages with the inner side wall of the lower end of the rubber sleeve (1). The rubber sleeve (1) also has a positioning element (7) for ensuring the steel core (4) is vertical when filling with powder.

2. The wet cold isostatic pressing mold according to claim 1, characterized in that, The positioning component (7) includes an outer ring (8) and an inner ring (9). The outer ring (8) and the inner ring (9) are connected by several connecting rods (10). The outer side wall of the outer ring (8) is engaged with the inner side wall of the rubber sleeve (1), and the inner side wall of the inner ring (9) is engaged with the outer side wall of the steel core (4).

3. The wet cold isostatic pressing mold according to claim 1, characterized in that, The thickness of the rubber sleeve (1) is 4-10mm, and the pressure resistance is 50Mpa-250Mpa. The rubber sleeve (1) is made of rubber.

4. A wet cold isostatic pressing mold according to claim 1, characterized in that, The height of the upper rubber plug (2) is equal to the height of the lower rubber plug (3), the height of the upper rubber plug (2) is 45-55mm, the depth of the upper limit blind hole (5) is equal to the depth of the lower limit blind hole (6), and the depth of the upper limit blind hole (5) is 30-40mm.

5. A wet cold isostatic pressing mold according to claim 1, characterized in that, The steel core (4) is made of 316 stainless steel or mold steel.

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