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Core filling material for investment casting and preparation method of core filling material

A technology of investment casting and core materials, applied in the direction of casting molding equipment, molds, cores, etc., can solve the problems affecting the dimensional accuracy of wax patterns and castings, thermal expansion of wax patterns, etc., achieve dimensional stability, enhance fluidity, The effect of small thermal expansion coefficient

Active Publication Date: 2019-05-10
上海万泽精密铸造有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the phosphate core material will release a certain amount of heat during the curing process, and the heat released in the inner cavity of the shell will cause the wax model to expand due to heat, thereby affecting the dimensional accuracy of the wax model and castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Pour 30g of calcium aluminate and 90g of 100-325 mesh fused silica powder into a ball mill for ball milling. The ball-to-material ratio is controlled at 2:1, and the ball milling time is 2 hours. The powder is ready for use.

[0024] Pour 50g of ammonium chloride and 50g of 100-325 mesh fused silica powder into a ball mill for ball milling. The ball-to-material ratio is controlled at 2:1, and the ball milling time is 2 hours. The powder is ready for use.

[0025] Weigh 350g of 100-325 mesh fused silica powder, 160g of 50-100 mesh fused silica powder, 146g of 20-50 mesh fused silica powder, 28g of the mixed ball milling powder of the above-mentioned calcium aluminate and 100-325 mesh of fused silica powder and 16g of the above-mentioned chlorine dioxide Ammonium chloride and 100-325 mesh fused silica powder are mixed and ball-milled, and these powders are put into a V-shaped mixer for mixing. The mixing time is 10 hours, and the mixture is ready for use.

[0026] Weigh 3...

Embodiment 2

[0028] Pour 30g of calcium aluminate and 90g of 100-325 mesh fused silica powder into a ball mill for ball milling. The ball-to-material ratio is controlled at 2:1, and the ball milling time is 2 hours. The powder is ready for use.

[0029] Pour 50g of ammonium chloride and 50g of 100-325 mesh fused silica powder into a ball mill for ball milling. The ball-to-material ratio is controlled at 2:1, and the ball milling time is 2 hours. The powder is ready for use.

[0030] Weigh 300g of 100-325 mesh fused silica powder, 175g of 50-100 mesh fused silica powder, 175g of 20-50 mesh fused silica powder, 32g of the above-mentioned calcium aluminate and 100-325 mesh of fused silica powder and 18g of the above-mentioned chlorine dioxide Ammonium chloride mixed ball mill powder with 100-325 mesh fused silica, put these powders into a V-shaped mixer for mixing, the mixing time is 10 hours, and mix well for later use.

[0031] Weigh 300g of silica sol, add 2g of surfactant and 1g of defoamer...

Embodiment 3

[0033] Pour 30g of calcium aluminate and 90g of 100-325 mesh fused silica powder into a ball mill for ball milling. The ball-to-material ratio is controlled at 2:1, and the ball milling time is 2 hours. The powder is ready for use.

[0034] Pour 50g of ammonium chloride and 50g of 100-325 mesh fused silica powder into a ball mill for ball milling. The ball-to-material ratio is controlled at 2:1, and the ball milling time is 2 hours. The powder is ready for use.

[0035] Weigh 370g of 100-325 mesh fused silica powder, 140g of 50-100 mesh fused silica powder, 130g of 20-50 mesh fused silica powder, 40g of the mixed ball milling powder of the above-mentioned calcium aluminate and 100-325 mesh of fused silica powder and 20g of the above-mentioned chlorine dioxide Ammonium chloride mixed ball mill powder with 100-325 mesh fused silica, put these powders into a V-shaped mixer for mixing, the mixing time is 10 hours, and mix well for later use.

[0036] Weigh 300g of silica sol, add ...

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PUM

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Abstract

The invention discloses a core filling material for investment casting and a preparation method of the core filling material and relates to the core filling material for investment casting. The core filling material comprises fused quartz powder with the mesh of 100-325 and mass percentage purity being larger than or equal to 99.5%, fused quartz powder with the mesh of 50-100 and mass percentage purity being larger than or equal to 99.5%, fused quartz powder with the mesh of 20-50 and mass percentage purity being larger than or equal to 99.5%, calcium aluminate with the mass percentage puritybeing larger than or equal to 99.5%, ammonium chloride with the mass percentage purity being larger than or equal to 99.5%, silica sol with, by mass percentage, 29%-31% of silicon dioxide and the pH of 9.7-10.5, a surfactant and a defoamer. The main component of the core filling material is fused quartz which has small thermal expansion coefficient and stable size and can be well matched with mostshells; and the addition of the surfactant enhances the fluidity of slurry, so that the slurry has higher solid content.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a core-filling material for investment casting. Background technique [0002] Near-net-shape investment casting technology is the mainstream technology for preparing high-precision components in the world. By adopting high-quality molding materials and casting materials and strictly controlling various process links and process factors in the casting forming process, the method can obtain near-net-shape castings with no machining or partial grinding on the working surface. The dimensional accuracy and surface roughness of investment casting precision castings are close to polished ones, the dimensional tolerance can be controlled within ±0.5% of the nominal size, and the surface roughness can reach Ra3.2. It is a comprehensive technology that intersects multiple disciplines such as CAD / CAM / CAE technology, materials science, metallurgical physics and chemistry, precision m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02B22C1/18B22C9/04
Inventor 王飞何博魏剑辉陈博文谢金群高旭陆敏
Owner 上海万泽精密铸造有限公司