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Thermal treatment method of precision casting lost foam precision casting die shell

A technology of precision casting and processing methods, which is applied in the direction of casting molding equipment, casting molds, casting mold components, etc., which can solve the problems of large energy and refractory material consumption, long production cycle, and rapid equipment aging, so as to reduce the defects of casting pores, Improve stability and overcome the effect of high consumption

Active Publication Date: 2013-01-23
安徽应流铸业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing roasting process, there is still a small amount of residual organic matter in the mold shell, which is easy to cause pore defects in castings, consumes a lot of energy and refractory materials, the equipment is aging quickly, and the production cycle is long

Method used

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  • Thermal treatment method of precision casting lost foam precision casting die shell
  • Thermal treatment method of precision casting lost foam precision casting die shell

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Experimental program
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Embodiment Construction

[0016] The heat treatment method of the lost foam mold shell of precision casting is carried out in the following steps:

[0017] Firstly, put the prepared lost foam formwork 1 in a gas-fired roaster and bake it to 1050°C, and keep it warm for half an hour. Secondly, open the furnace door of the roasting furnace, quickly remove the mold shell 1, place it on the sandy ground, place the sprue sideways, and immediately inject oxygen 2 into the mold shell 1 while it is hot (≥800°C), and use the mold shell 1 itself Heat and oxygen fully oxidize the residual organic matter in the inner cavity and pores of the mold shell 1, and then fill the mold shell 1 with hot air 3 to replace the oxygen 2, so as to obtain a high-quality mold shell 1 without residue, and achieve the purpose of reducing the pore defects of the casting. Then put it into the vacuum sand box and fill it with sand and vacuum pour.

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Abstract

The invention discloses a thermal treatment method of a precision casting lost foam precision casting die shell. The method comprises the following steps of: roasting a lost foam die shell in a gas roaster; and then letting oxygen and hot air pass through the die shell when the die shell is hot to obtain a high-quality casting. By the method, the consumption of an energy source and a refractory material is reduced; the ageing speed of equipment is postponed; the production period is shortened; and the quality stability of the casting is improved.

Description

technical field [0001] The invention mainly relates to the field of precision casting, in particular to a thermal treatment method for precision casting lost foam precision casting mold shells. Background technique [0002] The existing lost foam shell roasting process is: put the lost foam shell in a gas roasting furnace and bake it to 1050°C, then keep it warm for 2-3 hours (depending on the size, size, shape, thickness, etc. of the casting). Afterwards, the formwork is placed in a sandbox to vacuum-pour the casting. In the existing roasting process, there is still a small amount of residual organic matter in the mold shell, which is easy to cause pore defects in the casting, consumes a lot of energy and refractory materials, the equipment is aging quickly, and the production cycle is long. Contents of the invention [0003] The purpose of the present invention is to make up for the deficiencies of the existing technology, and to provide a method for thermal treatment o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/12B22C9/04
Inventor 杜应流胡学文施长坤
Owner 安徽应流铸业有限公司