Machining method for high-temperature resistant and anti-cracking casting

A processing method and high temperature resistant technology, applied in the field of mold shell casting, can solve the problems of large gas generation in the clay sand cavity, insufficient compactness of the molding sand, and reduced dimensional accuracy of castings, etc., so as to improve the efficiency of paste making and good adhesion. , the effect of improving mechanical properties

Inactive Publication Date: 2018-01-05
ANHUI HUSN KEWAN SPECIAL CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology has developed a high-temperature dewaxing kettle for production, but due to the large amount of gas generated in the clay sand cavity, the compactness of the sand is not uniform enough, and casting defects are often prone to occur, reducing the dimensional accuracy of castings

Method used

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  • Machining method for high-temperature resistant and anti-cracking casting

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Effect test

Embodiment 1

[0016] A processing method for a high-temperature-resistant crack-resistant casting, comprising the following steps:

[0017] (1) Crush calcined gypsum, wax, pyrophosphate, and glass enamel powder into fine powders with a size of 200 meshes, make the mixture into flakes through a wax machine, and then add the flakes of wax to the glycerin Heat and stir in the paste making barrel, the heating temperature is 80°C, the stirring speed is 1000 rpm, and the stirring time is 60 minutes to obtain a paste wax paste, which is injected into the pressure cavity through the wax injection machine, and the wax film is extruded and immediately put in 10 ℃ cold water;

[0018] (2) Melt the inner and outer layer materials of the shell casting to obtain a slurry, which is made of the following components in terms of mass percentage: 50% quartz, 10% mullite, 10% kaolinite, 3% zircon sand, oxidized Zirconium 2%, the rest is corundum, after mixing and stirring at 600 rpm for 10 minutes, reduce the...

Embodiment 2

[0025] A processing method for a high-temperature-resistant crack-resistant casting, comprising the following steps:

[0026] (1) Crush calcined gypsum, wax, pyrophosphate, and glass enamel powder into fine powders with a size of 250 meshes, make the mixture into flakes through a wax machine, and then add the flakes of wax to the glycerin Heat and stir in the paste making barrel, the heating temperature is 85°C, the stirring speed is 1100 rpm, and the stirring time is 65 minutes to obtain a paste wax paste, which is injected into the pressure cavity through the wax injection machine, and the wax film is extruded and immediately put in Cold water at 12°C;

[0027] (2) Melt the inner and outer layer materials of the shell casting to obtain the slurry, which is made of the following components in terms of mass percentage: 55% quartz, 12% mullite, 12% kaolinite, 4% zircon sand, oxidized Zirconium 2.5%, the rest is corundum, after mixing and stirring at 700 rpm for 12 minutes, red...

Embodiment 3

[0034] A processing method for a high-temperature-resistant crack-resistant casting, comprising the following steps:

[0035] (1) Crush calcined gypsum, wax, pyrophosphate, and glass enamel powder into fine powders with a size of 300 mesh, and make the mixture into flakes through a wax machine, and then add the flakes of wax to the glycerin Heat and stir in the paste making barrel, the heating temperature is 90°C, the stirring speed is 1200 rpm, and the stirring time is 70 minutes to obtain a paste wax paste, which is injected into the pressure cavity through the wax injection machine, and the wax film is extruded and immediately put in Cold water at 15°C;

[0036] (2) Melt the inner and outer layer materials of the shell casting to obtain a slurry, which is made of the following components in terms of mass percentage: 60% quartz, 15% mullite, 15% kaolinite, 5% zircon sand, oxidized Zirconium 3%, the rest is corundum, after mixing and stirring at 800 rpm for 15 minutes, reduc...

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Abstract

The invention relates to the technical field of mould shell casting and discloses a machining method for a high-temperature resistant and anti-cracking casting. The machining method comprises the following steps that (1) a wax mould is prepared, specifically, bassanite, a wax material, pyrophosphate and glass glaze powder are added in a wax material, thus, surface toughness is reduced, the organization form of the casting can be improved, an obtained mould shell is good in stability, the paste preparing efficiency is improved, and the wax material recycling rate is high; (2) materials on the inner layer and the outer layer of the mould shell casting are fused, specifically, quartz serves as a main raw material, zircon sand, zirconia, corundum and the like are added, thus, the mechanical properties such as tensile strength, harness and impact value of the casting are improved, by adding an adhesive, adhesiveness is good, the properties are not attenuated at the high temperature, and thefusion property of a fire retardant with ethyl silicate as the main component and fusion slurry is good; and (3) dewaxing treatment is conducted at the high temperature of 1000-1100 DEG C, and the required mould shell casting is obtained after the wax mould is completely fused. The machining method for the high-temperature resistant and anti-cracking casting is suitable for batch production of castings, and the production efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of shell casting, and in particular relates to a processing method for a high-temperature-resistant and crack-resistant casting. Background technique [0002] Investment casting usually refers to the pattern made of fusible materials, the surface of the pattern is coated with refractory material to make a shell, and then the pattern is melted and discharged from the shell, so as to obtain a casting without parting surface, which can be filled with sand after high temperature roasting The casting scheme, the existing technology is usually made of waxy materials. In recent years, with the development of investment casting technology, the surface quality and dimensional accuracy of precision castings are becoming higher and higher. The castings obtained by investment casting, It belongs to sports strong friction and wear parts, and the failure is the most serious, especially under the impact of high temperature...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C7/02B22C1/00B22C1/02B22C1/16
Inventor 刘成铭叶世林李勇周立明徐爱民
Owner ANHUI HUSN KEWAN SPECIAL CASTING
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