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Application method of roughing sand calcination technology to casting and sand core

An application method and technology of roasting sand, which is applied in the cleaning/processing of casting materials, such as machinery, molds, and cores, can solve the problems of sand core collapse, poor quality of casting inner cavity, etc., and achieve sand core release. Good, low wear effect

Inactive Publication Date: 2015-11-04
GUANGDONG FUHUA CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the phenomenon of gas generation is serious, the sand core is prone to collapse, and the quality of the inner cavity of the casting is poor.

Method used

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  • Application method of roughing sand calcination technology to casting and sand core
  • Application method of roughing sand calcination technology to casting and sand core
  • Application method of roughing sand calcination technology to casting and sand core

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Embodiment Construction

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0021] The invention provides a method for applying raw sand roasting technology to castings, comprising the following steps:

[0022] S1) New sand is sieved to remove impurities;

[0023] S2) Roasting at a high temperature of 900°C to make the phase change of silicon dioxide;

[0024] S3) The raw sand after roasting is naturally cooled to normal temperature;

[0025] S4) Core making.

[0026] The process of roasting raw sand to prepare coated sand is the same as that of general raw sand to prepare coated sand, but the coated sand pre...

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Abstract

The invention discloses an application method of a roughing sand calcination technology to a casting. The method comprises the following steps that firstly, fresh sand is screened, and impurities are removed; secondly, calcination is carried out at a high temperature being 900 DEG C, and the phase change of silicon dioxide occurs; thirdly, after the calcination is carried out, the fresh sand is naturally cooled until the fresh sand is at the normal temperature; and fourthly, a core is prepared. The high temperature calcination is carried out on the fresh sand, so that the addition quantity of resin is reduced, the gas-forming amount of precoated sand is reduced, the thermal stability of the precoated sand is high, the high temperature expansion is irreversible, and the dimensional accuracy of the casting can be guaranteed accordingly.

Description

technical field [0001] The invention relates to the field of casting technology, more specifically, it relates to an application method of raw sand roasting technology on castings and a sand core. Background technique [0002] At present, in the manufacturing process of foundry sand cores, the coated sand is mainly prepared from raw sand, and resin and organic auxiliary materials are added to form it. The gas of coated sand is formed by the gas produced by the combustion of raw sand, resin and organic auxiliary materials at high temperature. The gas in the raw sand is produced by the gasification, decomposition and combustion of impurities in silica sand, such as structural water in mica and Structural water produced by the gasification of feldspar and other kaolin escapes at high temperature, and some metal oxides decompose at high temperature, and the gas of organic matter that has not been removed after scrubbing and drying, etc. When the phenomenon of gas generation is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C5/00B22C9/10
Inventor 杨青春易大钢廖峰王克山周建文陶正文
Owner GUANGDONG FUHUA CASTING
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