A water glass precision casting process

A technology of precision casting and water glass, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems such as difficult to guarantee the surface quality, achieve the effect of reducing the workload of post-processing, reducing production costs, and improving the yield of castings

Active Publication Date: 2017-11-24
浙江福瑞科流控机械有限公司
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Problems solved by technology

[0003] At present, there is an environmentally friendly process that adopts carbon dioxide hardening and high-temperature dewaxing in the market, but it is suitable for the casting of water glass sand with a modulus of 3.0. When it is used for the production of castings weighing more than 20 kilograms per piece, the surface quality is difficult to guarantee, and the surface has burrs. , sticky sand, surface toad skin, orange peel and defects caused by delamination are unavoidable

Method used

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  • A water glass precision casting process

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Embodiment Construction

[0027] like figure 1 Shown, a kind of water glass method investment casting technique is characterized in that comprising the following steps:

[0028] The water glass method investment casting process includes the following steps:

[0029] 1) Preparation of wax material: heat, melt and stir paraffin wax and stearic acid in a mass ratio of 1:1 until they are evenly mixed into a paste, and the heating temperature is 80-89°C;

[0030] 2) Make wax mold: Pour the pasty wax material that has completed step 1) into the mold for wax injection, after pressure maintaining and cooling, take out the wax mold and put it in water in time to continue cooling;

[0031] 3) Wax model inspection: Use compressed air to clean the wax residue and residual water on the surface of the wax model that has completed step 2, use a trimming knife to remove the drape and protrusions on the parting surface, and use thin wax to fill in the defects and make it smooth ;

[0032] 4) Wax model group tree: Th...

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Abstract

The invention relates to a precision casting process. Aiming at the problems of the chemical method hardening and desanding process and low-mode water glass method castings that are prone to defects, etc., a carbon dioxide hardening and high temperature desanding process is independently designed. The water glass method precision casting process includes the preparation of Wax materials, wax mold making, wax mold inspection, wax mold assembly tree, coating preparation, mold shell making, hot air dewaxing, mold shell roasting, mold shell inspection, molten steel pouring, sand cleaning and cutting, and casting inspection. It eliminates equipment corrosion, environmental pollution, and hidden dangers to the personal safety of employees in the traditional chemical hardening and desanding process. The working environment reduces the production cost and greatly improves the production capacity of traditional water glass shells.

Description

technical field [0001] The invention relates to a precision casting process, in particular to a water glass precision casting process. Background technique [0002] The water glass casting process occupies a dominant position in my country's steel casting industry, and it has superior characteristics in terms of cost, efficiency, and operation than other casting methods. The traditional water glass casting process adopts aluminum chloride hexahydrate hardening and ammonium chloride solution dewaxing process, because aluminum chloride hexahydrate is easy to produce nitrite with water glass during the shell hardening process, which will corrode the equipment workshop, During the firing process, harmful gases will be produced, which will affect the air environment. Residual nitrite will affect the surface finish of castings, and waste water cannot be discharged. At the same time, the ammonium chloride solution is weakly acidic, and the acidity increases when heated. Corrosive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22C1/18
Inventor 高飞郑建军李国华高俊李泽玉邵一忠
Owner 浙江福瑞科流控机械有限公司
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