Large-size special ceramic sphere isostatic pressing forming device

Abstract

The utility model discloses a large -size special ceramic sphere isostatic pressing forming device belongs to ceramic sphere processing technical field. A large -size special ceramic sphere isostatic pressing forming device, including mutually adapted hemispherical mould shell alpha and hemispherical mould shell beta, its inside is provided with silica gel mould cover, is equipped with a plurality of static pressure holes on the outer wall, and the edge of hemispherical mould shell alpha and hemispherical mould shell beta is provided with flange, and the flange is provided with limiting part and positioning part, respectively located hemispherical mould shell alpha and hemispherical mould shell beta, when limiting part and positioning part butt joint, the limiting cavity for the position of the silica gel mould cover feed opening of constraint is formed between the two, and the inner wall of limiting cavity and the outside gap cooperation of silica gel mould cover feed opening, the utility model discloses can effectively limit the movement of silica gel mould cover, ensure that silica gel mould cover can stably wrap ceramic material in the process of pressurization, improve the flatness when two groups of mould shell combine, prevent the existence gap when combining.

Description

Technical Field

[0001] This utility model relates to the field of ceramic sphere processing technology, and in particular to an isostatic pressing device for large-size special ceramic spheres. Background Technology

[0002] Alumina ceramics have been developed for over half a century. Due to their excellent mechanical properties, electrical properties, and chemical stability, as well as the wide availability of raw materials and low manufacturing costs, they are the basic material for manufacturing high-strength, wear-resistant, and high-temperature-resistant high-performance ceramic components. They are widely used in machinery, communications, semiconductors, medicine, food, petroleum, chemical, and aerospace fields. Large alumina ceramic balls have been specifically applied in spherical seals, valve cores for large-diameter ball valves, and disc ball mills. For ceramic balls with a diameter exceeding 200mm, the traditional process involves cutting ceramic balls from ceramic green billets. This method is difficult to process, time-consuming, and wasteful of materials. In addition, the ceramic balls will have significant internal stress after being removed from the billet, making them prone to cracking during subsequent sintering, resulting in a high scrap rate.

[0003] A search revealed a Chinese patent publication number CN217669980U, which discloses an isostatic pressing device for large-size special ceramic spheres. In this device, a silicone mold sleeve is filled with ceramic powder, and two hemispherical mold shells are fitted over the silicone mold sleeve. High pressure is applied to the silicone mold sleeve by isostatic pressing. The static pressure holes on the hemispherical mold shells can evenly distribute the pressure to the inner silicone mold sleeve, allowing the ceramic powder inside the silicone mold sleeve to be evenly stressed and form ceramic spheres with good uniformity.

[0004] However, in actual use, it was found that when hemispherical mold shells A and B are joined together, the inlet of the silicone mold sleeve will affect the flatness of the joint between shells A and B, resulting in a certain gap when the mold shells are joined. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the prior art that the feed port of the silicone mold sleeve affects the flatness when shell A and shell B are joined, resulting in a certain gap when the mold shells are joined. Therefore, this invention proposes a large-size special ceramic sphere isostatic pressing molding device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A large-size special ceramic sphere isostatic pressing molding device includes mutually compatible hemispherical mold shell A and hemispherical mold shell B, with a silicone mold sleeve disposed on the inner side of each mold shell A and B, and several static pressure holes opened on the outer wall of each mold shell B. Flanges are disposed on the edges of hemispherical mold shell A and hemispherical mold shell B, with limiting components and positioning components disposed on the flanges, respectively located on hemispherical mold shell A and hemispherical mold shell B. When the limiting component and the positioning component are aligned, a limiting cavity is formed between them to constrain the position of the silicone mold sleeve inlet. The inner wall of the limiting cavity is clearance-fitted with the outer wall of the silicone mold sleeve inlet.

[0008] To facilitate limiting the feed inlet of the silicone mold sleeve, preferably, a limiting block is provided at the bottom of the flange on the hemispherical mold shell.

[0009] To improve the limiting effect of the silicone mold inlet, preferably, the limiting component includes a U-shaped groove formed on the limiting block, the U-shaped groove is connected to the hemispherical mold shell, and a slot is formed on the U-shaped groove.

[0010] Furthermore, the depth of the slot is 3-8mm.

[0011] In order to enable the U-shaped groove and the U-shaped block to be used in conjunction, preferably, the positioning component includes a U-shaped block that is fixedly connected to the bottom of the flange on the hemispherical mold shell B.

[0012] Furthermore, when the U-shaped block is inserted into the slot, the height of the U-shaped block is less than the depth of the slot.

[0013] To improve the limiting effect of the silicone mold inlet, preferably, the limiting component includes a flat groove formed on the limiting block, and at least two sets of protrusions are equidistantly arranged on the flat groove, forming a U-shaped limiting cavity between the two sets of protrusions.

[0014] In order to enable the positioning block to be used in conjunction with the U-shaped limiting cavity, the positioning component further includes a positioning block fixedly connected to the bottom of the flange on the hemispherical mold shell B, and the bottom of the positioning block is provided with at least one set of tips, which are adapted to the U-shaped limiting cavity.

[0015] Furthermore, when the positioning block is inserted into the U-shaped limiting cavity, the height of the positioning block is less than the depth of the U-shaped limiting cavity.

[0016] To facilitate the static pressure connection of the two sets of mold shells, preferably, the flanges on hemispherical mold shell A and hemispherical mold shell B are respectively provided with connecting holes and connecting rods, and the connecting holes and connecting rods cooperate with each other.

[0017] Compared with the prior art, this utility model provides an isostatic pressing device for large-size special ceramic spheres, which has the following beneficial effects:

[0018] 1. This large-size special ceramic sphere isostatic pressing forming device has a limiting component and a positioning component on the flange, which are respectively located on hemispherical mold shell A and hemispherical mold shell B. When the limiting component and the positioning component are connected, a limiting cavity is formed between them to constrain the position of the silicone mold sleeve inlet. The inner wall of the limiting cavity is fitted with the outer clearance of the silicone mold sleeve inlet, which effectively restricts the movement of the silicone mold sleeve and ensures that the silicone mold sleeve can stably wrap the ceramic material during the pressurization process, thereby improving the flatness when the mold shells are joined.

[0019] 2. This large-size special ceramic sphere isostatic pressing molding device, through the cooperation of connecting holes and connecting rods, enables two hemispherical mold shells to be firmly connected together to form a complete sphere mold. This connection method is not only simple and easy to implement, but also has high connection strength and can withstand the huge pressure in the isostatic pressing molding process, ensuring the molding quality of the ceramic sphere.

[0020] The parts of this device not covered herein are the same as or can be implemented using existing technology. This utility model can effectively limit the movement of the silicone mold sleeve, ensure that the silicone mold sleeve can stably wrap the ceramic material during the pressurization process, improve the flatness when the two sets of mold shells are joined, and prevent gaps from existing during the joint. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a U-shaped block in an isostatic pressing device for large-size special ceramic spheres proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of the U-shaped groove of the isostatic pressing device for large-size special ceramic spheres proposed in this utility model;

[0023] Figure 3 This is a schematic diagram of the positioning block of a large-size special ceramic sphere isostatic pressing forming device proposed in this utility model.

[0024] Figure 4 This is a schematic diagram of the flat-mouth groove of the isostatic pressing device for large-size special ceramic spheres proposed in this utility model.

[0025] In the diagram: 1. Hemispherical mold shell A; 101. Connecting hole; 2. Hemispherical mold shell B; 201. Connecting rod; 3. Limiting block; 301. U-shaped groove; 302. Slot; 303. Flat groove; 304. Protrusion; 4. U-shaped block; 5. Positioning block. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0028] Alumina ceramics have been developed for over half a century. Due to their excellent mechanical properties, electrical properties, and chemical stability, as well as the wide availability of raw materials and low manufacturing costs, they are a fundamental material for manufacturing high-strength, wear-resistant, and high-temperature-resistant high-performance ceramic components. They are widely used in machinery, communications, semiconductors, pharmaceuticals, food, petroleum, chemical, and aerospace industries. Large alumina ceramic balls have been specifically applied in spherical seals, valve cores for large-diameter ball valves, and disc ball mills. In existing technologies, a silicone mold is typically placed inside a hemispherical mold shell A1, and then the ceramic is filled into the silicone mold from the feed inlet. The powder can be sealed at the feed inlet with rubber bands or ropes. After filling, the hemispherical mold shell B2 and hemispherical mold shell A1 are joined together through the flange to form a circular mold. The forming device filled with ceramic powder is then placed into the cage, cleaned, and then hoisted into the high-pressure chamber. Pressurization, pressure holding, and pressure release are performed in sequence, with the pressure set at 150MPa. After the pressure release is completed, the cage is hoisted out of the high-pressure chamber and cleaned. Then, the hemispherical mold shell B2 or hemispherical mold shell A1 is removed, and the silicone mold sleeve is flipped off the pressed ceramic ball blank and removed from the ceramic ball blank. The uneven parts on the ceramic ball blank at the feed inlet are then smoothed out.

[0029] Example 1:

[0030] Reference Figures 1-2A large-size special ceramic sphere isostatic pressing molding device is provided. Several static pressure holes are formed on the outer walls of hemispherical mold shells A1 and B2. The distribution design of the static pressure holes avoids local pressure loss and ensures consistent pressure at any position within the mold shells. Flanges are provided on the edges of hemispherical mold shells A1 and B2, with limit components and positioning components respectively located on the hemispherical mold shells A1 and B2. When the limit components and positioning components are aligned, a constraint is formed between them for the silicone... The limiting cavity at the mold sleeve inlet position has an inner wall that fits with the outer clearance of the silicone mold sleeve inlet, so that the silicone mold sleeve inlet is located within the limiting cavity. When hemispherical mold shell A1 and hemispherical mold shell B2 are joined, the flanges on hemispherical mold shell A1 and hemispherical mold shell B2 can fit tightly, preventing leakage during pressurization. At the same time, it can also effectively limit the movement of the silicone mold sleeve, ensuring that the silicone mold sleeve can stably wrap the ceramic material during pressurization, and improving the flatness when the mold shells are joined.

[0031] A limiting block 3 is set at the bottom of the flange on the hemispherical mold shell A1 to place the inlet of the silicone mold sleeve.

[0032] The aforementioned limiting component includes a U-shaped groove 301 formed on the limiting block 3, which is connected to the hemispherical mold shell A 1. A slot 302 is formed on the U-shaped groove 301, and the depth of the slot 302 is 3-8 mm. The depth in this device is 5 mm. The positioning component includes a U-shaped block 4 fixedly connected to the bottom of the flange on the hemispherical mold shell B 2. When the U-shaped block 4 is inserted into the slot 302, the height of the U-shaped block 4 is less than the depth of the slot 302. At this time, the top of the U-shaped block 4 and the bottom of the slot 302 are... A certain gap is formed, which provides a certain space for the silicone mold sleeve inlet, ensuring that it can have a certain elastic deformation during the pressurization process, thereby better sealing the silicone mold sleeve inlet. At the same time, the design of the U-shaped groove 301 makes the connection between the limiting block 3 and the hemispherical mold shell A1 more secure, and it is not easy to loosen or fall off. In addition, the matching method of the slot 302 and the U-shaped block 4 is simple and easy to operate, which can greatly improve production efficiency and convenience, and also improve the flatness when the two sets of mold shells are combined.

[0033] Example 2:

[0034] Reference Figures 3-4Furthermore, to improve the flatness when the two sets of mold shells are joined, the aforementioned limiting component includes a flat groove 303 formed on the limiting block 3. Three sets of protrusions 304 are equidistantly arranged on the flat groove 303, and a U-shaped limiting cavity is formed between two sets of protrusions 304. The positioning component includes a positioning block 5 fixedly connected to the bottom of the flange on the hemispherical mold shell B2. The bottom of the positioning block 5 is provided with at least two sets of tips, which are adapted to the U-shaped limiting cavity so that the tips can be inserted into the U-shaped limiting cavity. When the positioning block 5 is inserted into the U-shaped limiting cavity, the height of the positioning block 5 is less than the depth of the U-shaped limiting cavity. At this time, the tip of the positioning block 5 can press against the outer wall of the silicone mold inlet and then make close contact with the side wall of the formed U-shaped limiting cavity to form a stable limiting structure, which further improves the limiting effect. In addition, the number and spacing of the protrusions 304 can be adjusted to flexibly adapt to silicone molds of different sizes, enhancing the practicality of the device.

[0035] In addition, the flanges on hemispherical mold shell A1 and hemispherical mold shell B2 are respectively provided with connecting holes 101 and connecting rods 201. The connecting holes 101 and connecting rods 201 cooperate to firmly connect the two hemispherical mold shells together to form a complete spherical mold. This connection method is not only simple and easy to implement, but also has high connection strength and can withstand the huge pressure in the isostatic pressing process, ensuring the molding quality of the ceramic sphere. At the same time, the design of connecting holes 101 and connecting rods 201 also facilitates the disassembly and cleaning of the mold shells, improving the ease of use and maintenance efficiency of the device.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A large-size special ceramic sphere isostatic pressing molding device, comprising mutually compatible hemispherical mold shell A (1) and hemispherical mold shell B (2), wherein a silicone mold sleeve is provided on the inner side of each mold shell, and a plurality of static pressure holes are provided on the outer wall of each mold shell A (1) and hemispherical mold shell B (2), wherein flanges are provided on the edges of the hemispherical mold shell A (1) and hemispherical mold shell B (2), characterized in that, The flange is provided with a limiting component and a positioning component, which are located on the hemispherical mold shell A (1) and the hemispherical mold shell B (2) respectively. When the limiting component and the positioning component are connected, a limiting cavity is formed between them to constrain the position of the silicone mold inlet. The inner wall of the limiting cavity is in clearance fit with the outer wall of the silicone mold inlet.

2. The isostatic pressing device for large-size special ceramic spheres according to claim 1, characterized in that, A limiting block (3) is provided at the bottom of the flange on the hemispherical mold shell (1).

3. The isostatic pressing device for large-size special ceramic spheres according to claim 1 or 2, characterized in that, The limiting component includes a U-shaped groove (301) formed on the limiting block (3), the U-shaped groove (301) is connected to the hemispherical mold shell (1), and a slot (302) is formed on the U-shaped groove (301).

4. The isostatic pressing device for large-size special ceramic spheres according to claim 3, characterized in that, The depth of the slot (302) is 3-8mm.

5. The isostatic pressing device for large-size special ceramic spheres according to claim 3, characterized in that, The positioning component includes a U-shaped block (4) fixedly connected to the bottom of the flange on the hemispherical mold shell (2).

6. The isostatic pressing device for large-size special ceramic spheres according to claim 5, characterized in that, When the U-shaped block (4) is inserted into the slot (302), the height of the U-shaped block (4) is less than the depth of the slot (302).

7. The isostatic pressing device for large-size special ceramic spheres according to claim 1, characterized in that, The limiting component includes a flat groove (303) opened on the limiting block (3), and at least two sets of protrusions (304) are equidistantly arranged on the flat groove (303), forming a U-shaped limiting cavity between the two sets of protrusions (304).

8. The isostatic pressing device for large-size special ceramic spheres according to claim 7, characterized in that, The positioning component includes a positioning block (5) fixedly connected to the bottom of the flange on the hemispherical mold shell (2). The bottom of the positioning block (5) is provided with at least one set of tips, which are adapted to the concave-shaped limiting cavity.

9. The isostatic pressing device for large-size special ceramic spheres according to claim 8, characterized in that, When the positioning block (5) is inserted into the concave-shaped limiting cavity, the height of the positioning block (5) is less than the depth of the concave-shaped limiting cavity.

10. The isostatic pressing device for large-size special ceramic spheres according to claim 1, characterized in that, The flanges on the hemispherical mold shell A (1) and hemispherical mold shell B (2) are respectively provided with connecting holes (101) and connecting rods (201), and the connecting holes (101) and connecting rods (201) are matched.

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