Partial air cooling method for precast aperture passage in investment casting shell

An investment casting, partial technology, applied in the direction of casting molding equipment, casting mold, casting mold composition, etc., can solve the problems of poor controllability of cooling range and cooling rate, achieve high controllability of cooling range and increase local cooling rate Effect

Inactive Publication Date: 2013-05-01
TSINGHUA UNIV
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  • Description
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  • Application Information

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Problems solved by technology

This process can play a certain role in enhancing the local cooling of castings, but there are obvious shortcomings, such as poor controllability of cooling range and cooling rate, etc.

Method used

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  • Partial air cooling method for precast aperture passage in investment casting shell

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] First, press the wax mold and weld the gating system according to the normal investment casting process, and then proceed to the shell making process. When the shell-making process has reached a certain number of layers and the shell has established a certain strength, as shown in the attached figure, stick wax strips on the parts of the casting that need to be cooled quickly, first bake the wax strips to soften them, and then Press on the surface of the shell to make it stick to the surface of the shell, melt a small amount of adhesive wax and drop it on the gap between the wax strip and the shell to fix the wax strip on the surface of the shell. According to the shape and size of the part to be cooled, one or more wax strips can be pasted, and the specific arrangement of the wax strips can be determined according to the actua...

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Abstract

A partial air cooling method for a precast aperture passage in an investment casting shell comprises the following steps: 1, forming a shell on a wax pattern surface according to the regular investment casting process; 2, sticking a material that can be removed from the inside of the shell through heating or with a chemistry method onto a part, needing quick cooling, of the shell surface; 3, continuing the shell forming, burying the material that can be removed from the inside of the shell through the heating or with a chemistry method into the shell, and enabling a part of the material at an air inlet and an air outlet to be naked; 4, removing the material in the shell and forming a cooling air passage; 5, performing high temperature roasting to the shell with the interior material removed according to the process requirements; and 6, using the shell for casting, introducing air into the cooling air passage according to the partial cooling requirement, and forming a strong partial convection heat exchange. According to the shape and the size of the required partial cooling part, the removable material is flexibly arranged to form a specific air passage structure, the cooling range controllability is high and the cooling rate can be controlled through the intensity of airflow.

Description

technical field [0001] The invention relates to the technical field of investment casting, in particular to a local air cooling method for a prefabricated channel in an investment casting shell. Background technique [0002] In the field of casting, casting defects such as shrinkage cavity and shrinkage porosity will occur due to the problem of cooling sequence. In sand casting, the local cooling rate of the casting can be increased by placing chilled iron in the sand mold to achieve the effect of controlling the cooling sequence, but in investment casting, the same process cannot be simply used to achieve enhanced Effect of local cooling rate. At present, the blowing cooling process of investment casting has been specifically applied in China. The process plan is to use compressed gas to blow air directly at the parts that need local cooling. This process can play a certain role in enhancing the local cooling of castings, but there are obvious shortcomings, such as poor c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04
Inventor 吕志刚申辰
Owner TSINGHUA UNIV
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