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Method for preparing casting shell of fired mold

A technology of investment casting and wax mold, which is applied in the field of investment casting mold shell preparation, which can solve the problems of low copper alloy pouring temperature, impermeable mold shell roasting, and difficult separation, so as to improve shell removal and reduce residual strength , the effect of improving production efficiency

Inactive Publication Date: 2016-03-23
HUZHOU NANFENG MACHINERY MFG
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  • Abstract
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Problems solved by technology

[0002] In the investment casting of existing copper impeller parts, there will be a narrow space between the runner and the cover plate, which leads to many difficulties in the spatial arrangement of the runner. Together, and the thickness of the shell here is relatively thick, there will be the following problems: 1. If the roasting is carried out according to the normal roasting temperature and roasting time, the thicker part of the shell will be roasted imperviously. If the roasting time is prolonged , it will cause a waste of resources, and other problems such as shell deformation will occur; 2. Due to the low pouring temperature of the copper alloy, the mullite-like silica sol shell coated on the back layer of the shell is not easy to separate, and it is difficult to clean the shell. The shell poses great difficulties

Method used

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Embodiment Construction

[0021] Below in conjunction with embodiment, further set forth the present invention. In the following detailed description, certain exemplary embodiments of the invention are described by way of illustration only. Needless to say, those skilled in the art would realize that the described embodiments can be modified in various different ways, all without departing from the spirit and scope of the present invention. Therefore, the description of the present embodiment is illustrative in nature and not intended to limit the protection scope of the claims.

[0022] Including the step of preparing the surface layer, the step of preparing the transition layer, the step of preparing the back layer, the step of dewaxing, and the step of roasting;

[0023] Preparation of the surface layer: firstly, the coating needs to be prepared. The coating disclosed in this embodiment is silica sol or water glass, which can make the mold shell smoother, thereby improving the casting precision and...

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Abstract

The invention discloses a method for preparing a casting shell of a fire mold. The method comprises a surface layer preparing step, a transition layer preparing step, a back layer preparing step, a dewaxing step and a roasting step. According to the method for preparing the casting shell of the fire mold, the roasting time of the shell is shortened, the roasting temperature of the shell is reduced, and energy can be saved; and the residue strength of the shell is reduced, the shell removing performance of the shell is improved, cleaning of the shell after casting is facilitated, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of investment casting precision casting, in particular to a method for preparing investment casting shells. Background technique [0002] In the investment casting of existing copper impeller parts, there will be a narrow space between the runner and the cover plate, which leads to many difficulties in the spatial arrangement of the runner. Together, and the thickness of the shell here is relatively thick, there will be the following problems: 1. If the roasting is carried out according to the normal roasting temperature and roasting time, the thicker part of the shell will be roasted imperviously. If the roasting time is prolonged , it will cause a waste of resources, and other problems such as shell deformation will occur; 2. Due to the low pouring temperature of the copper alloy, the mullite-like silica sol shell coated on the back layer of the shell is not easy to separate, and it is difficult to clean...

Claims

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Application Information

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IPC IPC(8): B22C9/04
Inventor 黄德海张贤杰胡新明
Owner HUZHOU NANFENG MACHINERY MFG
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