Method for preventing shell expansion of thick and large surface of precision-casting stainless steel casting

A technology of precision casting and stainless steel, which is applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problems of affecting the quality of castings, increasing manufacturing costs, increasing labor load, etc. The effect of reducing labor

Inactive Publication Date: 2011-09-21
SHANDONG TAISHAN STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual production, it is often encountered that some stainless steel precision castings have thick and large planes. With traditional casting methods, thick and large planes are easy to cause shell expansion during the shell drying process or dewaxing process, resulting in thick castings. Large plane bulges seriously affect the quality of castings, greatly increase the labor load of subsequent processes, and even cause waste products, resulting in increased manufacturing costs

Method used

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  • Method for preventing shell expansion of thick and large surface of precision-casting stainless steel casting
  • Method for preventing shell expansion of thick and large surface of precision-casting stainless steel casting
  • Method for preventing shell expansion of thick and large surface of precision-casting stainless steel casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: as figure 1 , 2 As shown, the rotor impeller 5802 is made by using the method of preventing the thick and large surface of the stainless steel casting from precision casting.

[0031] Proceed as follows:

[0032] (1) Shell making: Dip the wax mold of rotor impeller 5802 with zircon powder slurry, sprinkle zircon sand, and dry for 6 hours to form a surface shell;

[0033] The zircon powder slurry is composed of silica sol, wetting agent, and defoamer (the silica sol adopts JN30 silica sol produced by Qingdao Fusaike Casting Material Co., Ltd., and the lubricant adopts J.F.C. produced by Hangzhou Investment Precision Casting Research Institute. Lubricant and defoamer are composed of A-type defoamer produced by Shangyu Shuangyang Silicon Products Co., Ltd.) and 300-mesh zircon powder, with a weight ratio of 100:0.45:0.22:380; the sprinkled zircon sand is 100 mesh zircon sand;

[0034] Use the mullite powder slurry to dip the surface layer shell of the rot...

Embodiment 2

[0044] Embodiment 2: The L base 6205 is made by using the method of preventing the thick surface of the precision casting stainless steel casting from bulging.

[0045] Proceed as follows:

[0046] (1) Shell making: use zircon powder slurry to dip the wax mold of L base 6205 into the surface layer slurry, sprinkle zircon sand, and dry for 4-6 hours to form a surface layer shell;

[0047] The zircon powder slurry is composed of silica sol, wetting agent, and defoamer (the silica sol adopts JN30 silica sol produced by Qingdao Fusaike Casting Material Co., Ltd., and the lubricant adopts J.F.C. produced by Hangzhou Investment Precision Casting Research Institute. Lubricant and defoamer are composed of A-type defoamer produced by Shangyu Shuangyang Silicon Products Co., Ltd.) and 300-mesh zircon powder, and the weight ratio is 100: (0.45-0.47): (0.22-0.24): (360~400); the zircon sand sprinkled is 100 mesh zircon sand;

[0048] Use mullite powder slurry to dip the surface shell of...

Embodiment 3

[0058] Embodiment 3: The guide rail 421 is made by using the method of preventing the thick surface of the precision casting stainless steel casting from bulging.

[0059] Proceed as follows:

[0060] (1) Shell making: Dip the wax pattern of the guide rail 421 with zircon powder slurry, sprinkle zircon sand, and dry for 5 hours to form a surface shell;

[0061] The zircon powder slurry is composed of silica sol, wetting agent, and defoamer (the silica sol can adopt JN30 silica sol produced by Qingdao Fusaike Casting Material Co., Ltd., and the lubricant adopts the product produced by Hangzhou Investment Precision Casting Research Institute. J.F.C lubricant and defoamer are composed of A-type defoamer produced by Shangyu Shuangyang Silicon Products Co., Ltd.) and 300-mesh zircon powder, with a weight ratio of 100:0.46:0.23:400; sprinkled zircon sand 100 mesh zircon sand;

[0062] Use mullite powder slurry to dip the surface shell of the guide rail 421 with two-layer slurry an...

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Abstract

The invention relates to a method for preventing shell expansion of a thick and large surface of a precision-casting stainless steel casting. The method comprises the following steps of: 1, manufacturing all layers according to a traditional process till the layer of shell where a thick and large surface of a precision-casting stainless steel casting shell is bundled with iron wires, wherein the layer of shell bundled with iron wires can be any layer between the fourth layer and the antepenult layer and one thick and large surface is bundled with two rounds of iron wires between which the distance is not larger than 70mm; 2, completely covering the bundled iron wires with a pasty fireproof coating, completely filling gaps between the iron wires and previous layer of shell with the fireproof coating, and spreading fireproof sand on the pasty fireproof coating; 3, drying the pasty fireproof coating and the fireproof sand on the iron wires, and then fabricating next layer of shell till subsequent shell fabrication is completed according to process requirements; 4, dewaxing; 5, roasting; and 6, casting the shell. By the method disclosed by the invention, the percent defective of castings, caused by shell expansion, can be reduced to below 1.5% from the original more than 25%, labor load of subsequent process steps can be reduced greatly, and productivity is improved.

Description

[0001] technical field [0002] The invention relates to a method for preventing shell bulging of castings, in particular to a method for preventing shell bulging of precision casting stainless steel castings with thick and large surfaces. Background technique [0003] With the development of society, precision castings have been widely used in all industrial sectors including aviation and weapons, especially electronics, petroleum, chemical industry, transportation, light industry, textiles, pharmaceuticals, and medical equipment. Investment casting is a casting process with little or no cutting. The castings produced have the characteristics of high dimensional accuracy, low surface roughness, high flexibility and strong adaptability. In actual production, it is often encountered that some stainless steel precision castings have thick and large planes. With traditional casting methods, thick and large planes are easy to cause shell expansion during the shell drying process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04
Inventor 陈培敦赵星曹旭东王爱霞亓振宝
Owner SHANDONG TAISHAN STEEL GROUP
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