Self-hardening core for precision casting and manufacturing method thereof

A precision casting and self-hardening technology, which is applied to casting molding equipment, casting molds, cores, etc., can solve the problems of inability to cast mold cavities, high casting scrap rate, and difficulty in guaranteeing casting quality, and achieve convenient shelling and sand cleaning of castings , Reduce the scrap rate, improve the effect of quality

Inactive Publication Date: 2012-11-07
WUXI UNIVERSAL PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex and narrow cavity of the workpiece to be cast, if the core is made by the traditional method, the core is often broken and the iron head is scrapped, which not only makes the scrap rate of the casting very high, but also makes it difficult to guarantee the quality of the cast casting
It is even impossible to cast some workpieces with complex cavity and relatively narrow cavity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First select 35 parts by weight of silica sol, 25 parts by weight of mullite powder, 25 parts by weight of mullite sand and 1.8 parts by weight of lime. Wherein, the particle size of the mullite powder is 265 mesh, and the particle size of the mullite sand is 40 mesh.

[0023] Then, pour the silica sol into the container;

[0024] After that, put mullite powder and mullite sand together to form a mixture;

[0025] Afterwards, while stirring, pour the mixture into the container and mix it evenly with the silica sol;

[0026] Afterwards, add lime, continue to stir until uniform, obtain slurry;

[0027] Afterwards, the slurry is poured into the shell mold with a temperature of 20°C, and kept at a constant temperature of 20°C for 4.5 hours;

[0028] Finally, the shell mold is removed to obtain a self-hardening core for precision casting.

Embodiment 2

[0030] First select 39 parts by weight of silica sol, 30 parts by weight of mullite powder, 30 parts by weight of mullite sand and 2.0 parts by weight of lime. Wherein, the particle size of the mullite powder is 270 mesh, and the particle size of the mullite sand is 55 mesh.

[0031] Then, pour the silica sol into the container;

[0032] After that, put mullite powder and mullite sand together to form a mixture;

[0033] Afterwards, while stirring, pour the mixture into the container and mix it evenly with the silica sol;

[0034] Afterwards, add lime, continue to stir until uniform, obtain slurry;

[0035] Afterwards, pour the slurry into the shell mold with a temperature of 23°C, and keep it at a constant temperature for 5 hours at a temperature of 23°C;

[0036] Finally, the shell mold is removed to obtain a self-hardening core for precision casting.

Embodiment 3

[0038] First select 42 parts by weight of silica sol, 25 parts by weight of mullite powder, 25 parts by weight of mullite sand and 2.2 parts by weight of lime. Wherein, the particle size of the mullite powder is 275 mesh, and the particle size of the mullite sand is 70 mesh.

[0039] Then, pour the silica sol into the container;

[0040] After that, put mullite powder and mullite sand together to form a mixture;

[0041] Afterwards, while stirring, pour the mixture into the container and mix it evenly with the silica sol;

[0042] Afterwards, add lime, continue to stir until uniform, obtain slurry;

[0043] Afterwards, the slurry is poured into the shell mold with a temperature of 25°C, and kept at a constant temperature of 25°C for 5.5 hours;

[0044] Finally, the shell mold is removed to obtain a self-hardening core for precision casting.

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PUM

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Abstract

The invention relates to a self-hardening core for precision casting and a manufacturing method thereof and particularly relates to a self-hardening core which is used for casting workpieces with complex shapes or narrow cavities and a manufacturing method thereof. The manufacturing method of the self-hardening core for precision casting comprises the steps of mixing raw materials such as silica sol, mullite powder, mullite sand and lime, casting, unshelling and the like. By use of the self-hardening core for precision casting, workpieces with complex cavities and narrow cavities can be cast, the rejection rate of castings can be reduced, and the quality of castings can be improved.

Description

technical field [0001] The invention relates to a casting mold and a preparation method thereof. Specifically, it is a self-hardening core and its preparation method used when casting workpieces with complex shapes or narrow cavities. Background technique [0002] It is well known in the foundry industry that for a long time, molds have been used to make wax patterns first, and while coating paint layer by layer on the outside of the wax patterns, sanding and hardening are carried out to form mold shells. Then, the wax pattern is taken off, and the mold shell is fired. The molten steel is then poured into the mold shell to make a casting. Although the casting of the workpiece can be realized in this way, for the workpiece with a complex cavity and a relatively narrow cavity, in addition to coating, sanding, hardening, and shell making, it is also necessary to make a mold in the cavity. core. At present, the formation of the core still adopts the methods of coating, sandi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/10B22C1/20B22C9/10B22C9/04
Inventor 劭建栋
Owner WUXI UNIVERSAL PRECISION CASTING
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