Silicon carbide pipe isostatic pressing forming machining device

Abstract

The utility model discloses a silicon carbide pipe isostatic pressing forming machining device, which belongs to the technical field of silicon carbide forming and comprises a forming mold for machining a green body pipe body and an auxiliary demolding assembly matched with the green body pipe body. The forming mold comprises an outer mold body and a steel inner mold body which are matched with each other, a base is fixedly installed at one end of the steel inner mold body and attached to the inner wall of one end of the outer mold body, the steel inner mold body is sleeved with a steel tray, and the steel tray abuts against the base. The end, away from the base, of the steel inner mold is sleeved with a sealing cover to achieve sealing with the outer mold, and a cavity used for forming a green body pipe body is formed among the outer mold, the steel inner mold, the steel tray and the sealing cover. And the auxiliary demolding assembly covers the outer side of the pipe body with the steel inner mold.

Description

Technical Field

[0001] The utility model relates to the technical field of silicon carbide molding, in particular to an isostatic pressing device for silicon carbide tubes. Background Art

[0002] Diffusion tubes are special devices for solar silicon wafers to adsorb boron ions. Silicon wafers are placed in the diffusion tube and heated together in an electric heating furnace. Utilizing the thermal conductivity of the diffusion tube, as the temperature in the furnace rises, the temperature inside the diffusion tube gradually rises. When the temperature reaches 900°C, boron chloride gas is blown into the diffusion tube. The boron chloride decomposes under the heat, and the boron ions are adsorbed on the silicon wafer. After cooling, a layer of boron film is attached to the silicon wafer. Diffusion tubes are important production tools in solar silicon wafer processing. To improve the efficiency and quality of boron film adhesion on solar silicon wafers in a single furnace, the market has increasingly stringent requirements on diameter, length, and wall thickness. Therefore, the market prospects for large-diameter, extra-long, and thin-walled diffusion tubes are broad.

[0003] Thin-walled silicon carbide tubes with a diameter of less than 300 mm and a length of less than 1000 mm have been widely processed by isostatic pressing, especially in the refractory industry. However, as the diameter increases and the wall thickness decreases, the strength of the tube body inevitably decreases. During demolding and movement, deformation and even breakage are very likely to occur, which greatly affects the production efficiency and quality of large-diameter thin-walled tubes. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model provides an isostatic pressing device for silicon carbide tubes. By cooperating with a steel tray and a steel inner mold, the steel inner mold can be separated from the green tube body by lifting the steel tray, which can effectively reduce the difficulty of demolding the outer mold.

[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0006] A silicon carbide tube isostatic pressing processing device includes a forming die for processing a green tube body and an auxiliary demoulding component matched with the green tube body;

[0007] The forming mold includes an outer mold and a steel inner mold that cooperate with each other. A base is fixedly installed at one end of the steel inner mold, and the base is in contact with the inner wall of one end of the outer mold. A steel tray is mounted on the steel inner mold, and the steel tray abuts against the base. A sealing cover is mounted on the end of the steel inner mold away from the base to achieve sealing with the outer mold. A cavity for forming a green tube body is formed between the outer mold, the steel inner mold, the steel tray and the sealing cover.

[0008] The auxiliary demoulding component is covered on the outer side of the tube body with the steel inner mold.

[0009] Preferably, the side of the steel tray away from the base is covered with a soft rubber sleeve, and the side wall of the steel tray is provided with a plurality of evenly distributed grooves.

[0010] Preferably, the outer mold and the sealing cover are both formed from rubber materials.

[0011] Preferably, the auxiliary demoulding component is configured as a rubber tube, and the rubber tube is provided with a penetrating opening along the axial direction.

[0012] Preferably, the inner diameter of the rubber tube is 2 mm smaller than the outer diameter of the tube processed by the molding die.

[0013] Preferably, the diameter of the steel tray is not greater than the diameter of the base.

[0014] Preferably, an adhesive tape is wrapped around the outside of the rubber tube to achieve a tight fit between the rubber tube and the green tube body.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. In the present invention, the steel tray cooperates with the steel inner mold. By lifting the steel tray, the steel inner mold can be separated from the green tube body, which can effectively reduce the demoulding difficulty of the outer mold;

[0017] 2. The grooves on the side walls of the steel pallet in this utility model make it easy to lift the steel pallet;

[0018] 3. In the present invention, a rubber sleeve is used to assist in the separation of the steel inner mold during demoulding. The rubber sleeve tightly covers the green tube body, so that the force at each position of the green tube body is balanced, which can enhance the strength of the green tube body, avoid damage to the green tube body during the separation process of the steel inner mold, and avoid damage to the green tube body during transportation, which can further reduce the processing requirements for the wall thickness of the green tube body;

[0019] 4. The inner diameter of the rubber tube in the present invention is designed to be 2 mm smaller than the outer diameter of the tube processed by the forming mold. By utilizing the elasticity of the rubber itself, it can ensure that the rubber tube completely covers the green tube body, and can also ensure that the inner wall of the rubber sleeve is fully fitted with the steel tray, so that all parts of the green tube body are evenly stressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the forming die structure of an isostatic pressing forming device for a silicon carbide tube according to the present invention;

[0021] Figure 2 This is a schematic structural diagram of an auxiliary demoulding component of an isostatic pressing processing device for a silicon carbide tube according to the present invention;

[0022] Figure 3 This is a schematic diagram of the installation of an auxiliary demoulding component of an isostatic pressing processing device for a silicon carbide tube according to the present invention.

[0023] In the figure: 1-base, 2-steel inner mold, 3-steel tray, 4-outer mold, 5-sealing cover, 6-rubber tube, 7-green tube body. DETAILED DESCRIPTION

[0024] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1 The isostatic pressing processing device of a silicon carbide tube shown in the figure includes a forming mold for processing a green tube body 7 and an auxiliary demoulding component that cooperates with the green tube body 7; the forming mold includes an outer mold 4 and a steel inner mold 2 that cooperate with each other, and a base 1 is fixedly installed at one end of the steel inner mold 2, and the base 1 is in contact with the inner wall of one end of the outer mold 4. A steel tray 3 is mounted on the steel inner mold 2, and the steel tray 3 is in contact with the base 1. By cooperating with the steel tray 3 and the steel inner mold 2, the steel inner mold 2 can be separated from the green tube body 7 by lifting the steel tray 3, which can effectively reduce the demoulding difficulty of the outer mold 4. A sealing cover 5 is mounted on the end of the steel inner mold away from the base 1 to achieve sealing with the outer mold 4. The outer mold 4, the steel inner mold 2, and the steel tray 3 A cavity for molding the green tube body 7 is formed between the sealing cover 5; the auxiliary demoulding component is coated on the outside of the tube body with the steel inner mold 2, and the auxiliary demoulding component is set as a rubber tube 6. The rubber tube 6 is provided with a through opening in the axial direction. The design of the opening facilitates the installation and removal of the rubber tube 6. The outside of the rubber tube 6 is wrapped with tape to achieve a tight fit between the rubber tube 6 and the green tube body 7. The rubber tube 6 is used to assist the steel inner mold 2 to be separated during demoulding. The rubber tube 6 tightly covers the green tube body 7, so that the force at each position of the green tube body 7 is balanced, which can enhance the strength of the green tube body 7, avoid damage to the green tube body 7 during the separation process of the steel inner mold 2, and avoid damage to the green tube body 7 during transportation, which can further reduce the processing requirements of the wall thickness of the green tube body 7.

[0026] The side of the steel tray 3 away from the base 1 is covered with a soft rubber sleeve, which is used to achieve soft contact between the green tube body 7 and the steel base 1. The side wall of the steel tray 3 is provided with a number of evenly distributed grooves, and the design of the grooves is convenient for supporting the steel tray 3.

[0027] The outer mold 4 and the sealing cover 5 are both formed by processing rubber materials.

[0028] The inner diameter of the rubber tube 6 is 2 mm smaller than the outer diameter of the tube processed by the forming mold. By utilizing the elasticity of the rubber itself, it can be ensured that the rubber tube 6 completely covers the green tube body 7, and the inner wall of the rubber sleeve can be fully fitted with the steel tray 3, so that all parts of the green tube body 7 are evenly stressed.

[0029] The diameter of the steel tray 3 is not greater than the diameter of the base 1 , so as to prevent the steel tray 3 from affecting the installation and disassembly of the outer mold 4 .

[0030] During mold assembly, a steel inner mold 2 with a base 1 at one end is installed in an outer mold 4. The base 1 is sealed and fitted with one end of the outer mold 4. The steel inner mold 2 is fixedly mounted on the base 1. A freely movable steel tray 3 is mounted on the steel inner mold. The steel tray 3 is in contact with the base 1. A soft rubber sleeve is provided at the end of the steel tray 3 away from the base 1. A number of grooves are provided on the side wall of the steel tray 3. The weighed particles are then filled from the other end of the outer mold 4 into the gap between the steel inner mold 2 and the outer mold 4. The particles are in contact with the soft rubber sleeve on the steel tray 3. The sealing cover 5 mounted on the steel inner mold 2 is then used to seal the other end of the outer mold 4 to complete the mold assembly.

[0031] During demoulding, the green tube body 7 with the steel inner mold 2 is taken out from the isostatic pressing device, and then, with the cooperation of the base 1, the base 1 is pushed to separate the steel inner mold 2 with the green tube body 7 from the outer mold 4. Figure 2-3 As shown, after the green tube body 7 with the steel inner mold 2 is taken out, the base 1 is placed vertically downward on a plane, and then the rubber tube 6 with an opening through it in the axial direction is separated along the opening and wrapped around the outside of the green tube body 7, and then the rubber tube 6 is wrapped and fixed with tape to make the rubber tube 6 fit tightly to the green tube body 7. Under the support of the rubber tube 6, the steel tray 3 is lifted up through the groove, and the green tube body 7 with the rubber tube 6 is separated from the steel inner mold 2 with the support of the steel tray 3, and then the tape is cut, and the rubber tube 6 is pried open from the opening position to separate the rubber tube 6 and the green tube body 7 to complete the demolding.

[0032] The above content is merely an example and explanation of the structure of the present utility model. Technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the scope of protection of the present utility model.

Claims

1. A silicon carbide tube isostatic pressing processing device, characterized in that: It includes a forming die for processing a green tube body and an auxiliary demoulding component matched with the green tube body; The forming mold includes an outer mold and a steel inner mold that cooperate with each other. A base is fixedly installed at one end of the steel inner mold, and the base is in contact with the inner wall of one end of the outer mold. A steel tray is mounted on the steel inner mold, and the steel tray abuts against the base. A sealing cover is mounted on the end of the steel inner mold away from the base to achieve sealing with the outer mold. A cavity for forming a green tube body is formed between the outer mold, the steel inner mold, the steel tray and the sealing cover. The auxiliary demoulding component is covered on the outer side of the tube body with the steel inner mold.

2. The isostatic pressing device for silicon carbide tubes according to claim 1, characterized in that: The side of the steel tray away from the base is covered with a soft rubber sleeve, and the side wall of the steel tray is provided with a plurality of evenly distributed grooves.

3. The isostatic pressing device for silicon carbide tubes according to claim 1, wherein: The outer mold and the sealing cover are both formed by processing rubber materials.

4. The isostatic pressing device for silicon carbide tubes according to claim 1, wherein: The auxiliary demoulding component is configured as a rubber tube, and the rubber tube is provided with a penetrating opening along the axial direction.

5. The isostatic pressing device for silicon carbide tubes according to claim 4, characterized in that: The inner diameter of the rubber tube is 2 mm smaller than the outer diameter of the tube processed by the forming mold.

6. The isostatic pressing device for silicon carbide tubes according to claim 1, wherein: The diameter of the steel tray is no greater than the diameter of the base.

7. The isostatic pressing device for silicon carbide tubes according to claim 4, characterized in that: The outer side of the rubber tube is wrapped with adhesive tape to ensure close fit between the rubber tube and the green tube body.

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