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Method for improving casting surface quality

A surface quality and casting technology, applied in the direction of casting mold, casting mold composition, casting molding equipment, etc., can solve the problems of increasing the cost of post-processing of castings and increasing the workload of workers, achieving low production cost, labor saving, Simple production process

Inactive Publication Date: 2013-04-24
QINGDAO SANHESHAN CASTING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some production units, in order to make castings have good mechanical properties and high-quality surface quality, adopt grinding or machining methods to process castings, which not only increases equipment investment and post-processing costs of castings, but also increases the workload of workers

Method used

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Embodiment

[0017] The method for improving the surface quality of the casting of the present embodiment includes the following steps:

[0018] (1) Clean the surface of the casting;

[0019] (2) Dispose refractory paint and sintered layer paint respectively: the components of the raw material of the refractory paint and the parts by weight of each component are: 60 parts of graphite, 30 parts of flake graphite, 3 parts of activated bentonite, sodium carboxymethyl cellulose 1 part; the particle size of the graphite and flake graphite are both 200 mesh; the sintered layer coating is prepared with zircon powder;

[0020] (3) First apply a layer of sintered layer paint on the sand mold surface of the inner cavity of the casting, and then paint a layer of refractory paint after the secondary paint.

[0021] The method of improving the surface quality of castings is to use double-layer coating. The main material of the refractory coating is graphite, whose melting point is above 3000 °C and ha...

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Abstract

The invention discloses a method for improving casting surface quality. A double-layer coating is adopted and the method comprises: coating a layer of sinter layer coating on the sand mold surface of the core cavity part of a casting, and then coating a layer of fire-resistant coating on a second coating. The fire-resistant coating comprises the following components, by weight percentage, 60-70 parts of graphite, 30-40 parts of flaky graphite, 3-4 parts of activated bentonite and 0.5-1 part of sodium carboxymethyl cellulose, wherein the granularity of the graphite and the flaky graphite both are 200 meshes and the sinter layer coating adopts zircon power. The bottom layer adopts sinter layer coating which sinterings into thin casing in the function of high temperature after contacting with molten iron, while the surface fire-resistant coating enables the thin casing to be separated with molten iron completely without wetting phenonmenon. After unpacking the casting, the thin casing automatically breaks away from the casting and the casting of smooth surface is formed without cleaning. The manufacturing technique is simple, the labor force is saved and the manufacturing cost is low.

Description

[0001] technical field [0002] The invention belongs to the technical field of casting, and in particular relates to a method for improving the surface quality of a casting by adopting a double-layer coating process. [0003] Background technique [0004] Casting surface quality is an important part of casting quality, and for some types of castings, it even becomes the key to casting quality. In some production units, in order to make the castings have good mechanical properties and high-quality surface quality, the castings are treated by grinding or machining, which not only increases the equipment investment and the post-processing cost of the castings, but also increases the workload of the workers. Coating is a mixture of various materials. The formulation and correct use of high-quality coatings are the key technologies to improve the appearance quality of castings. [0005] SUMMARY OF THE INVENTION [0006] In order to overcome the above-mentioned technical pro...

Claims

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Application Information

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IPC IPC(8): B22C3/00
Inventor 李宁波
Owner QINGDAO SANHESHAN CASTING GROUP
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