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Manufacturing process of three-layer shell membrane for precision casting

A technology of precision casting and manufacturing process, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc. It can solve the problems of low strength and achieve the effects of good strength stability, increased strength and shortened drying time

Inactive Publication Date: 2021-01-08
芜湖正科精密机械制造有限公司
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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 three-layer shell film manufacturing process for precision casting, by using mullite and mullite powder to carry out the slurry soaking and sand sticking processes respectively, using the same material, improving the mixing degree, and solving the problem of the existing three-layer shell membrane. The shell membrane adopts the problem of low strength of different materials

Method used

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Embodiment Construction

[0015] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with examples, which are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

[0016] This embodiment provides a three-layer shell film manufacturing process for precision casting, the process steps are as follows,

[0017] Step 1, mix mullite powder and silica sol, and stir evenly to form a slurry;

[0018] Before operation, use a stopwatch to measure whether the pulp concentration is standard and adjust it. Adjust the stopwatch to zero, hold the measuring cup with your right hand and the stopwatch with your left hand, wet the measuring cup, make a cup of pulp and pour it out, tilt the measuring cup into the pulp barrel to fill up the pulp, keep the measuring cup flat; quickly Lift the measuring cup out of the pulp surface with your left hand and press the stopwatc...

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Abstract

The invention provides a manufacturing process of a three-layer shell membrane for precision casting. The process comprises the following steps that step one, mullite powder and silica sol are mixed and uniformly stirred to form slurry; step two, immersing sizing is carried out after secondary casting; step three, mullite sand is poured into a floating sand barrel to the position of a marking line; step four, the shell membrane after immersing sizing is placed into the floating sand barrel for sand burning; and step five, the shell membrane after sand burning is dehumidified and dried. By adopting the mullite sand and the mullite powder, the material cost is reduced, the drying time is effectively shortened, the labor intensity is reduced, and the shell membrane strength is improved.

Description

technical field [0001] The invention relates to the field of precision casting, in particular to a three-layer shell film manufacturing process for precision casting. Background technique [0002] At present, when performing precision casting, shell membranes are used for casting, and the current shell membranes are manufactured using a three-layer process. In three castings, the shell membrane is easy to crack due to the different materials used, and the strength of the shell membrane is low, so it becomes very important to solve this problem. Contents of the invention [0003] The purpose of the present invention is to provide a three-layer shell film manufacturing process for precision casting, by using mullite and mullite powder to carry out the slurry soaking and sand sticking processes respectively, using the same material, improving the mixing degree, and solving the problem of the existing three-layer shell membrane. The shell membrane adopts the problem of low st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C1/18
CPCB22C1/165B22C1/186B22C9/04
Inventor 陈波徐高峰
Owner 芜湖正科精密机械制造有限公司
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