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High-strength gypsum investment shell preparation process

A preparation process and high-strength technology, applied in the field of investment casting, can solve the problems of easy formation of blind holes, shell cracking, low shell strength, etc., and achieve the effect of firm bonding without separation, high strength, and enhanced mechanical strength

Inactive Publication Date: 2018-04-20
ANHUI XINHONG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Gypsum-type investment casting is a new casting technology first developed in foreign countries in the 1970s. Its technological process is to form a gypsum-type investment mold after certain processing and processing of raw materials configured in a certain proportion, and finally in the gypsum cast on the investment mold to form the final casting, and then the casting is dewaxed to obtain the plaster shell. In the preparation process, the plaster mold needs to be prepared first. It is not easy to control, and it is easy to form blind holes. At the same time, for the existing sand mold shell, the strength of the shell is not high, and it is easy to cause the shell to crack during use or transportation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A high-strength gypsum fusion mold shell preparation process, the specific process is:

[0018] (1) After degreasing the surface of the wax pattern, spray a layer of self-transfer coating on the surface of the wax pattern, and then place the wax pattern at 40-45°C to dry;

[0019] (2) After the paint is completely dry, place the wax pattern in the adhesive colloid and slowly rotate until the surface of the wax pattern is bonded with a layer of adhesive colloid, take out the wax pattern and place it at room temperature until the adhesive colloid is solidified; The preparation process of the colloid is as follows: add 1.3kg of oxidized starch into 5.5L of water, heat up to 45°C and stir evenly, then add 26g of magnesium chloride and stir to dissolve completely, then add 0.56L of a 25% glutaraldehyde solution dropwise while stirring, After the addition is complete, raise the temperature to 60°C and stir for 40 minutes to obtain a low melting point colloid

[0020] (3) Put...

Embodiment 2

[0024] A high-strength gypsum fusion mold shell preparation process, the specific process is:

[0025] (1) After degreasing the surface of the wax pattern, spray a layer of self-transfer coating on the surface of the wax pattern, and then place the wax pattern at 45°C to dry;

[0026] (2) After the paint is completely dry, place the wax pattern in the adhesive colloid and slowly rotate until the surface of the wax pattern is bonded with a layer of adhesive colloid, take out the wax pattern and place it at room temperature until the adhesive colloid is solidified; The preparation process of the colloid is as follows: add 2kg of oxidized starch into water, heat up to 50°C and stir evenly, then add 50g of magnesium chloride and stir to dissolve completely, then add 0.9L of a 25% glutaraldehyde solution drop by drop while stirring, after the addition is complete Raise the temperature to 65°C and stir for 70 minutes to obtain a low-melting colloid;

[0027] (3) Put the wax model i...

Embodiment 3

[0031] A high-strength gypsum fusion mold shell preparation process, the specific process is:

[0032] (1) After degreasing the surface of the wax pattern, spray a layer of self-transfer coating on the surface of the wax pattern, and then place the wax pattern at 40-45°C to dry;

[0033] (2) After the paint is completely dry, place the wax pattern in the adhesive colloid and slowly rotate until the surface of the wax pattern is bonded with a layer of adhesive colloid, take out the wax pattern and place it at room temperature until the adhesive colloid is solidified; The preparation process of the colloid is as follows: add 2kg of oxidized starch into water, heat up to 45-50°C and stir evenly, then add 60g of magnesium chloride and stir to dissolve completely, then add 0.95L of glutaraldehyde solution with a concentration of 25% dropwise while stirring, After the addition is complete, raise the temperature to 65°C and stir for 40 minutes to obtain a low-melting colloid;

[003...

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PUM

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Abstract

The invention discloses a high-strength gypsum investment shell preparation process. The process comprises the following specific steps: after grease on the surface of a wax mold is removed, a layer of self-transfer paint is sprayed on the surface of the wax mold; after the paint is totally dried, the wax mold is positioned in a binding colloid for slow rotating until a layer of binding colloid isbonded on the surface of the wax mold; the wax mold is taken out to place on the binding colloid for solidification at normal temperature; the wax mold is placed in composite gypsum pulp for slow rotating until the surface of the wax mold is coated with a layer of gypsum pulp; and the dried wax mold is placed in the binding colloid again for repeated operation by three times, so that three layersof gypsum shell molds are compounded on the surface of the wax mold. As the self-transfer paint is firstly coated on the surface of the wax mold, and then, three layers of binding colloids and the composite gypsum pulp are coated on the surface of the wax mold, through isolation and compound effects of the binding colloid, the three layers of composite gypsum pulp are totally compounded on the surface of the wax mold, and a prepared gypsum molding shell is high in strength.

Description

technical field [0001] The invention belongs to the field of investment casting, and relates to a preparation process for a high-strength gypsum fusion model shell. Background technique [0002] Gypsum-type investment casting is a new casting technology first developed in foreign countries in the 1970s. Its technological process is to form a gypsum-type investment mold after certain processing and processing of raw materials configured in a certain proportion, and finally in the gypsum cast on the investment mold to form the final casting, and then the casting is dewaxed to obtain the plaster shell. In the preparation process, the plaster mold needs to be prepared first. It is not easy to control, and it is easy to form blind holes. At the same time, for the existing sand mold shell, the strength of the shell is not high, and it is easy to cause the shell to crack during use or during transportation. Contents of the invention [0003] The purpose of the present invention ...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C1/00
CPCB22C1/00B22C9/043
Inventor 刘奎新王璐孙同昂
Owner ANHUI XINHONG MACHINERY
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