Shell material used for pump valve type precision castings, and preparation process and application thereof

A precision casting and shell material technology, applied in the direction of casting molding equipment, molds, mold components, etc., can solve the problems of cost increase, difficulty in shelling, long production cycle, etc.

Active Publication Date: 2020-10-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a shell material used in pump and valve precision castings and its preparation process and application, which is suitable for the manufacturing process of p...

Method used

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  • Shell material used for pump valve type precision castings, and preparation process and application thereof
  • Shell material used for pump valve type precision castings, and preparation process and application thereof
  • Shell material used for pump valve type precision castings, and preparation process and application thereof

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Embodiment 1

[0028] In this embodiment, it is carried out according to the method described in the technical solution of the present invention. First, mix the fused silica powder and ethyl silicate in a weight ratio of 10:3 and stir evenly. The particle size of the fused silica powder is 53 μm. Stir with a T-type mixer at a speed of 120 rpm for 50 hours to make a slurry. Then adjust the viscosity of the slurry with deionized water, measure the viscosity with a No. 5 flow cup, and adjust the viscosity value to 8.8s. Apply the slurry evenly on the shell back layer with a thickness of 0.85mm. Sprinkle white corundum powder evenly into the slurry on the back layer of the shell with a rain shower sander. The white corundum powder accounts for 30% by weight of the slurry, the particle size is 220 μm, the sanding speed is 3m / s, and the time is 9 seconds. , forming a layer of quartz material. Coat one layer of quartz material with a thickness of 1.2mm on the shell, and dry it for 8 hours in a...

Embodiment 2

[0031] In this embodiment, it is carried out according to the method described in the technical solution of the present invention. First, mix the fused silica powder and ethyl silicate in a weight ratio of 10:5 and stir evenly. The particle size of the fused silica powder is 108 μm. Stir with a T-type mixer at a speed of 110 rpm for 72 hours to make a slurry. Then adjust the viscosity of the slurry with deionized water, measure the viscosity with a No. 5 flow cup, and adjust the viscosity value to 16.8s. Apply the slurry evenly on the shell back layer with a thickness of 1.05mm. Sprinkle white corundum powder evenly into the slurry of the back layer of the shell with a rain shower sander, the white corundum powder accounts for 23% by weight of the slurry, the particle size is 120μm, the sanding speed is 4m / s, and the time is 8 seconds , forming a layer of quartz material. Coat three layers of quartz material with a thickness of 3.9mm on the shell, and dry for 6 hours in a...

Embodiment 3

[0034] In this embodiment, it is carried out according to the method described in the technical solution of the present invention. First, mix the fused silica powder and ethyl silicate in a weight ratio of 10:4 and stir evenly. The particle size of the fused silica powder is 189 μm. Stir with a T-type mixer at a speed of 175 rpm for 83 hours to make a slurry. Then adjust the viscosity of the slurry with deionized water, measure the viscosity with a No. 5 flow cup, and adjust the viscosity value to 12.8s. Apply the slurry evenly on the shell back layer with a thickness of 1.11 mm. Sprinkle white corundum powder evenly into the slurry of the back layer of the shell with a rain shower sanding machine. The white corundum powder accounts for 15% by weight of the slurry, the particle size is 160 μm, the sanding speed is 6m / s, and the time is 8 seconds. , forming a layer of quartz material. Coat the shell with 3 layers of quartz material with a thickness of 4.3mm, and dry it for...

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Abstract

The invention relates to the technical field of precision casting and material preparation, in particular to a shell material used for pump valve precision castings and preparation process and application thereof. The used base material is the electroquartz powder, the binder is ethyl silicate, and the reinforcing material is the white corundum powder. Firstly, the electroquartz powder and ethyl silicate are mixed in proportions and stirred evenly, and the viscosity of the slurry is adjusted through deionized water to form a slurry. Then, the slurry is coated on the back layer of the shell, the number of the coating layers is 1 to 3, and the thickness is 0.5 to 3 mm. Then, the conventional slurry is coated to make the pump valve type precision casting shell, which is used for pouring the castings. The pump valve precision casting shell prepared by using the shell material and process disclosed by the invention has good collapsibility, can be applied to the precision casting industry, and can effectively solve the long production cycle and cost increase caused by the difficulty of shelling and other problems, which has higher economic benefits and long-term application prospects.

Description

Technical field: [0001] The invention relates to the technical field of precision casting and material preparation, in particular to a shell material used for precision castings of pumps and valves and its preparation process and application. Background technique: [0002] Pumps and valves are the key components of petroleum pipelines and boiler pipelines, and are currently produced by precision casting. Because there are many corners, grooves, bosses and other parts on the structure of pump and valve parts, after the high-temperature molten steel is poured, the heat is not easy to dissipate, resulting in high local temperature. Traditional ceramic shell materials, such as corundum and coal gangue , mullite, etc., are prone to crystal transformation reactions, making the shell structure denser and higher in strength after casting, so problems such as long production cycle and cost increase caused by difficult shelling often occur. Contents of the invention [0003] The pu...

Claims

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Application Information

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IPC IPC(8): B22C1/20B22C1/02B22C3/00B22C9/04
CPCB22C1/02B22C1/20B22C3/00B22C9/04
Inventor 杨金侠周亦胄孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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