Welded mold shell casting process for gypsum composite polymer viscous mortar

A composite polymer and casting process technology, applied in the field of investment casting, can solve the problems of difficult control of the inner cavity of the gypsum mold, low strength of the mold shell, and easy formation of blind holes, etc., to achieve strong bonding, compact mold shell, strong adhesive effect

Active Publication Date: 2018-06-05
青田保俐铸造有限公司
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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 fusion shell casting process of gypsum composite polymer viscous mortar, the specific process steps are as follows

[0018] (1) Heat and melt 7.5kg of paraffin, then add 1kg of zeolite powder, 0.2kg of silica sol, 0.1kg of nano-titanium dioxide and 0.5kg of graphite to the melted paraffin, vacuumize, stir and mix evenly under vacuum conditions, and obtain a wax injection liquid ;Inject the wax injection liquid into the mold base through the wax injection machine, place it at room temperature until the wax injection liquid solidifies, and slowly take out the solidified wax model core from the mold base;

[0019] (2) the wax pattern prepared in step 1 is placed in a mass fraction of 3% sodium bicarbonate solution to remove the grease on the surface of the wax pattern, then the wax pattern is placed in the coating, so that the surface of the wax pattern is covered with a layer of coating, and then Dry the coated wax pattern at 40-50°C;

[0020] (3) Coating one layer of ...

Embodiment 2

[0025] A fusion shell casting process of gypsum composite polymer viscous mortar, the specific process steps are as follows:

[0026] (1) Heat and melt 8 kg of paraffin, then add 1.2 kg of zeolite powder, 0.4 kg of silica sol, 0.2 kg of nano-titanium dioxide and 0.6 kg of graphite to the melted paraffin, vacuumize, stir and mix evenly under vacuum conditions, and obtain a wax injection liquid ;Inject the wax injection liquid into the mold base through the wax injection machine, place it at room temperature until the wax injection liquid solidifies, and slowly take out the solidified wax model core from the mold base;

[0027] (2) the wax pattern prepared in step 1 is placed in a mass fraction of 4% sodium bicarbonate solution to remove the grease on the surface of the wax pattern, then the wax pattern is placed in the coating, so that the surface of the wax pattern is coated with a layer of coating, and then Dry the coated wax pattern at 40-50°C;

[0028] (3) Coating one laye...

Embodiment 3

[0033] A fusion shell casting process of gypsum composite polymer viscous mortar, the specific process steps are as follows:

[0034] (1) Heat 8.6kg of paraffin to melt, then add 1.4kg of zeolite powder, 0.5kg of silica sol, 0.3kg of nano-titanium dioxide and 0.9kg of graphite to the melted paraffin, vacuumize, stir and mix evenly under vacuum conditions, and obtain wax injection Liquid; inject the wax injection liquid into the mold base through the wax injection machine, place it at room temperature until the wax injection liquid solidifies, and slowly take out the solidified wax model core from the mold base;

[0035](2) the wax pattern prepared in step 1 is placed in a mass fraction of 5% sodium bicarbonate solution to remove the grease on the surface of the wax pattern, then the wax pattern is placed in the coating, so that the surface of the wax pattern is coated with a layer of coating, and then Dry the coated wax pattern at 40-50°C;

[0036] (3) coating one layer of co...

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PUM

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Abstract

The invention discloses a welded mold shell casting process for gypsum composite polymer viscous mortar. The welded mold shell casting process specifically comprises the following steps: preparing a wax mold, removing grease on the surface of the wax mold, putting into a coating to coat the surface of the wax mold by a layer of the coating, further coating the surface of the wax mold with a layerof composite colloid, and drying at a room temperature; putting the wax mold into gypsum slurry, and slowly rotating till the surface of the wax mold is adhered to a layer of the gypsum slurry; slowlyputting the wax mold into polymer viscous mortar, rotating at a slow speed till the surface of the wax mold is coated by a layer of the mortar, taking out the wax mold, curing in a curing agent solution immediately, further putting the wax mold into the gypsum slurry, so as to feed the gypsum slurry into a polymer mortar shell formed on the surface of the wax mold. As three layers, namely a gypsum layer, a polymer mortar layer and a gypsum layer, are arranged in sequence from inside to outside of the wax mold shell, a mold shell is relatively high in strength and is not liable to crack due tothe support and adhesion functions of the polymer mortar layer.

Description

technical field [0001] The invention belongs to the field of investment casting, and relates to a casting process of a fusion shell of gypsum composite polymer viscous mortar. 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 object of the present ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C7/02B22C3/00B22C9/04B22C1/02
CPCB22C1/02B22C3/00B22C7/02B22C9/043
Inventor 刘奎新王璐孙同昂
Owner 青田保俐铸造有限公司
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