A method of cleaning a deep hole blind slot silicon sol gel type shell

Abstract

The application discloses a method for cleaning a deep-hole blind groove silica sol shell, which comprises the following steps: through shell vibration, the method process of separating the separating material from the blind groove to realize the cleaning process. The shell is formed by casting, the first layer and the third layer are formed by using different purpose fused quartz mixtures, and the glass phase fusion between the particles cannot occur at high temperature. After the metal melt of the casting forms the casting by solidifying the shell, the first layer and the third layer formed by the separating material can be separated from the blind groove of the casting by vibration, so that the cleaning process is realized, and the problem that the deep-hole blind groove of the shell has a strong connection structure and needs to be removed by acid and alkali, which causes great environmental pollution and corrodes the surface of the casting and affects the surface quality of the casting is solved.

Description

Technical Field

[0001] This invention relates to a method for cleaning silica sol molded shells with deep hole blind grooves, belonging to the field of casting molded shell technology. Background Technology

[0002] The characteristic of investment casting is that it can produce molds with extremely complex shapes, i.e., shells. In other words, this method can be used to cast complex shapes with deep holes and narrow grooves. However, the shells that form these deep holes and narrow grooves are mainly made of calcined kaolin as the backing material. Its main chemical components, in addition to SiO2 and Al2O3, include oxides such as K, Na, and Ca. The mullite phase accounts for about 60%, and the rest are cristobalite and glass phase. The glass phase is dispersed between the various crystal phases, accounting for about 15%. As the temperature rises above 1300℃, the glass phase in the particles begins to soften and melt. At even higher temperatures, it melts and flows and fuses with the glass phase in adjacent solid particles. Then, it cools down in the deep holes and narrow grooves to form a strong, glass-like bonded structure that is difficult to remove.

[0003] Current technology often fails to remove residues from deep holes and blind grooves after casting using conventional methods such as vibration delamination and shot blasting. Instead, techniques like alkaline boiling and acid soaking are employed to remove these residues. While alkaline boiling and acid soaking can remove mold shell residues from deep holes and blind grooves, these chemical cleaning methods cause significant environmental pollution and can corrode the casting surface, affecting its quality. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a method for cleaning silica sol shells with deep hole blind grooves.

[0005] The present invention is achieved through the following technical solutions.

[0006] This invention provides a method for cleaning silica sol-type shells with deep-hole blind trenches, comprising:

[0007] The method of cleaning is to detach the material from the blind groove by vibrating the shell.

[0008] The release material is coated on the blind groove to form the first layer of the transition layer.

[0009] The first layer is coated with a second layer consisting of zircon powder surface layer slurry.

[0010] The third layer is coated on the second layer, and the third layer is composed of a shell release material.

[0011] A fourth layer, consisting of zircon powder slurry, is applied in the third layer.

[0012] It also includes a cover sealing layer made of zircon powder surface slurry, which covers and seals the top of the first, second, third and fourth layers.

[0013] The diaphragm detachment material is composed of 55% 200-mesh fused silica powder, 5% 50 / 100-mesh fused silica sand, 20% 280-mesh refined quartz powder, and 20% 280-mesh electrofused mullite powder.

[0014] The beneficial effects of this invention are as follows: In the shell casting process, the first and third layers are composed of fused quartz of different purposes, so it is impossible for glass phase fusion between particles to occur at high temperatures. After the molten metal of the casting solidifies into the casting, the first and third layers composed of detached materials are vibrated by the shell to achieve the process of detaching from the blind groove of the casting and cleaning. This solves the problem that the blind groove of the deep hole of the shell has a strong bonding structure that requires acid and alkali removal, which causes great environmental pollution and will corrode the surface of the casting and affect the surface quality of the casting. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the cross-section of the deep hole blind groove of the present invention; Detailed Implementation

[0016] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0017] like Figure 1 As shown.

[0018] This application discloses a method for cleaning silica sol-type shells with deep-hole blind trenches, comprising:

[0019] A first layer 2 is applied to the inner wall of the blind groove 1 of the deep hole blind groove of the shell. The shell is calcined kaolin, and the first layer 2 is a transition layer.

[0020] A second layer 3, consisting of zircon powder surface layer slurry, is coated on the first layer 2;

[0021] A third layer 4 is coated on the second layer 3. The first layer 2 and the third layer 4 are made of a diaphragm release material. The diaphragm release material is composed of 55% 200-mesh fused silica powder, 5% 50 / 100-mesh fused silica sand, 20% 280-mesh refined quartz powder, and 20% 280-mesh electrofused mullite powder. The calculation is based on parts by weight, consisting of 55 kg of fused silica powder, 5 kg of 50 / 100-mesh fused silica sand, 20 kg of 280-mesh refined quartz powder, and 20 kg of 280-mesh electrofused mullite powder mixed in the following proportions.

[0022] The fourth layer 5 is formed by coating the third layer 4 with zircon powder slurry. The top of the first layer 2, the second layer 3, the third layer 4 and the fourth layer 5 are covered and sealed with zircon powder slurry. The covering and sealing layer is not shown in the figure.

[0023] The shell is cast using a mold. The first layer (2) and the third layer (4) are composed of a mixture of fused silica for different purposes. Fused silica is an amorphous form of SiO2 with an extremely low coefficient of thermal expansion. Furthermore, the fused silica contains 99.9% SiO2 with very few impurities, making it impossible for glassy phase fusion between particles to occur at high temperatures. After the molten metal solidifies in the shell to form the casting, the first and third layers (2 and 4) are vibrated by a vibrating shell to detach them from the blind groove (1), thus achieving the cleaning process. This solves the problem that the deep-hole blind groove in the shell has a strong bonding structure that requires acid and alkali removal, resulting in significant environmental pollution and corrosion of the casting surface, affecting the surface quality of the casting.

Claims

1. A method of cleaning a deep hole blind slot silicon sol-gel type shell characterized in that, Comprise: The method process of cleaning by separating the material from the blind groove (1) through the lithosphere; The separating material is composed of 55% 200 mesh fused quartz powder, 5% 50 / 100 mesh fused quartz sand, 20% 280 mesh refined quartz powder and 20% 280 mesh fused mullite powder; The separating material is coated on the blind groove (1) to form the first layer (2) of the transition layer; The first layer (2) is coated with the second layer (3) of zirconium powder surface layer slurry; The third layer (4) is coated in the second layer (3), and the third layer (4) is composed of the separating material.

2. The method of claim 1 wherein the deep hole blind slot silicon sol gel shell is cleaned by: The fourth layer (5) of zirconium powder surface layer slurry is coated in the third layer (4).

3. The method of claim 2 wherein the deep hole blind slot silicon sol gel shell is cleaned by: It also includes a covering sealing layer composed of zirconium powder surface layer slurry.

4. The method of claim 3 wherein the deep hole blind slot silicon sol gel shell is cleaned by: The covering sealing layer covers and seals on the top of the first layer (2), the second layer (3), the third layer (4) and the fourth layer (5).

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