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Preparation method of coated sand for austenitic stainless steel

A technology of austenitic stainless steel and coated sand, applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of increased production costs, prolonging the production cycle, and failure to achieve wide application in foundries, and reduce waste products rate effect

Inactive Publication Date: 2018-06-19
沈阳金安铸造材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional coated sand has low refractoriness and is limited to low-temperature industries such as cast iron and non-ferrous metals. In stainless steel and other high-temperature cast steel industries, due to the serious sand sticking on the surface of castings, the rejection rate of castings is very high, and it has not been widely used. Application; if you need to improve the refractoriness, you need to paint the surface, which increases the process and prolongs the production cycle, which greatly increases the production cost of the foundry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method of coated sand for austenitic stainless steel, comprising the following steps:

[0017] 1. Raw sand heating: Take 60 parts of Hainan sand 70-140 mesh, 25 parts of Fujian sand 70-140 mesh, and 1 part of white corundum with a particle size of 0-1mm in parts by weight, and add it to a rotary gas heating furnace at a temperature of 130 °C Internally heat, mix evenly, and continue heating for another 2 minutes when the temperature reaches about 120°C.

[0018] 2. Sand mixing and coating: pour the mixture of three kinds of sand heated in step 1 into the planetary sand mixer. Add 3 parts of alkaline phenolic resin and 1 part of urotropine in turn into the planetary sand mixer, add 1 part of calcium stearate after 70 seconds, mix for 4 minutes, mix until uniform, and discharge.

[0019] 3. Vibrating sieving and cooling: Put the coated sand prepared in step 2 into a vibrating sieve, vibrate, sieve and remove the existing impurities, and cool to room tempera...

Embodiment 2

[0022] A preparation method of coated sand for austenitic stainless steel, comprising the following steps:

[0023] 1. Raw sand heating: Take 63 parts of Hainan sand 70-140 mesh, 26 parts of Fujian sand 70-140 mesh, and 1 part of white corundum with a particle size of 0-1mm in parts by weight, and add it to a rotary gas heating furnace at a temperature of 130°C Internally heat, mix evenly, and continue heating for another 2 minutes when the temperature reaches about 120°C.

[0024] 2. Sand mixing and coating: pour the mixture of three kinds of sand heated in step 1 into the planetary sand mixer. Add 5 parts of alkaline phenolic resin and 3 parts of urotropine successively into the planetary sand mixer, add 1 part of calcium stearate after 70 seconds, mix for 4 minutes, mix until uniform, and discharge.

[0025] 3. Vibrating sieving and cooling: Put the coated sand prepared in step 2 into a vibrating sieve, vibrate, sieve and remove the existing impurities, and cool to room te...

Embodiment 3

[0028] A preparation method of coated sand for austenitic stainless steel, comprising the following steps:

[0029] 1. Raw sand heating: take 65 parts of Hainan sand 70-140 mesh, 30 parts of Fujian sand 70-140 mesh, and 5 parts of white corundum with a particle size of 0-1mm in parts by weight, and add them to a rotary gas heating furnace at a temperature of 130°C Internally heat, mix evenly, and continue heating for another 2 minutes when the temperature reaches about 120°C.

[0030] 2. Sand mixing and coating: pour the mixture of the three kinds of sand heated in step 1 into the planetary sand mixer. Add 8 parts of alkaline phenolic resin and 5 parts of urotropine sequentially into the planetary sand mixer, add 5 parts of calcium stearate after 70 seconds, mix for 4 minutes, mix until uniform, and discharge.

[0031] 3. Vibrating sieving and cooling: Put the coated sand prepared in step 2 into a vibrating sieve, vibrate, sieve and remove the existing impurities, and cool to...

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Abstract

The invention discloses a preparation method of coated sand for austenitic stainless steel. The formula of the preparation method comprises, by weight, 60-65 parts of amomum longiligulare, 25-30 partsof raw sand from Fujian sea coast, 1-5 parts of white corundum, 3-8 parts of alkaline phenolic resin, 1-5 parts of urotropine and 1-5 parts of calcium stearate. According to the coated sand preparedby the method, refractoriness is high, tensile strength is high, burnt-on sand resistance is high, the rejection rate of castings is reduced, resources and energy are saved, the production period is shortened, and the production cost is reduced.

Description

technical field [0001] The invention relates to a method for preparing casting sand, in particular to a method for preparing coated sand for austenitic stainless steel. Background technique [0002] Traditional coated sand has low refractoriness and is limited to low-temperature industries such as cast iron and non-ferrous metals. In stainless steel and other high-temperature cast steel industries, due to the serious sand sticking on the surface of castings, the rejection rate of castings is very high, and it has not been widely used. Application: If it is necessary to improve the refractoriness, it is necessary to paint the surface, which increases the process and prolongs the production cycle, which greatly increases the production cost of the foundry. Contents of the invention [0003] The purpose of the present invention is to provide a method for preparing coated sand for austenitic stainless steel. The coated sand prepared by this method has high refractoriness, stro...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/02
CPCB22C1/00B22C1/02
Inventor 康德林张健曹海瑞
Owner 沈阳金安铸造材料股份有限公司
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