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Method for Gypsum Type Investment Precision Casting Using Copper Tube

A technology of investment precision casting and gypsum molding, which is used in casting molding equipment, cores, molds, etc., can solve problems such as punching cores, core displacement, and scrap castings, and achieves low mold requirements and high precision. High and cost-reducing effect

Active Publication Date: 2016-03-02
成都新航工业科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention overcomes the deficiencies of the prior art, and provides a method for using copper tubes to carry out gypsum-type investment casting precision casting, in order to solve the problems often caused by mold making and casting during the production process of gypsum-type investment precision casting in the prior art. Displacement, punching of the core, causing casting scrap, low pass rate and other problems

Method used

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Examples

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Embodiment Construction

[0021] The present invention will be further elaborated below according to the examples.

[0022] In this embodiment, the method for carrying out gypsum-type investment precision casting with a copper tube comprises the following steps:

[0023] The copper tube is made into a pre-shaped structure; the copper tube in this embodiment can preferably be selected to use a red copper tube. The pre-formed structure can be designed and shaped according to the needs of the actual casting product. The specific operation steps can be to use a copper tube with a diameter of 1 mm to 5 mm. The diameter of the copper tube can be determined according to actual needs, and can also be 2 mm to 3 mm copper tube or 4 mm copper tube is pressed with a mold. After the pressing is completed, it is cut off with a sharp tool, and then assembled by welding. The copper tube is placed in the mold to press the wax pattern. Then the formed copper tube is embedded in the wax mold and positioned accurately. ...

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Abstract

The invention discloses a method for carrying out plaster mould precise investment casting by utilizing copper pipes. The method comprises the following steps: manufacturing a copper pipe with a predetermined structure, placing the formed copper pipe in a mound to manufacture a wax mould; embedding the formed copper pipe in the wax mould, precisely positioning the copper pipe so as to carry out processes of grouting, sintering, and casting; wherein after the casting process, the copper pipe is embedded in an aluminum casting; and soaking the aluminum casting in a nitric acid solution until the copper pipe completely finishes chemical reactions. The method has the advantages of simple operation technology, reliability, high precision, and low requirements on mould, reduces the cost, and can realize casting of complex and tiny pipelines at the same time. The qualified rate of special-shaped casting with a small diameter manufactured by the method can reach 90% or more.

Description

technical field [0001] The invention relates to a method for gypsum-type investment precision casting, in particular to a method for using a copper tube to perform gypsum-type investment precision casting. Background technique [0002] In the early 1980s, my country developed gypsum-type precision investment casting. Many enterprises, scientific research institutes, and colleges and universities in the country also analyzed and tested gypsum from different origins in the country, and there were several production of gypsum for casting. The manufacturer has also carried out research on the preparation of α and β hemihydrate gypsum, the hydration mechanism of hemihydrate gypsum, the role of fillers and additives, etc., and carried out the composition ratio and performance of gypsum mixture, the preparation of gypsum type, and the hardening process. Influencing factors, research on performance testing, research on gypsum type drying, dewaxing, roasting, research on foamed gypsum,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04
Inventor 王斌
Owner 成都新航工业科技股份有限公司
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