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Clay molding sand for cast steel and preparation method thereof

A clay mold and steel casting technology, which is applied to casting molding equipment, molds, cores, etc., can solve the problems of broken sand molds, insufficient impact strength and heat resistance, and scrapped castings, so as to prevent sand sticking and prevent Effect of sand mold rupture and improvement of casting yield

Inactive Publication Date: 2014-02-12
TONGLING JINGWEI FLUID SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Due to the insufficient impact strength and heat resistance of the existing molding sand, the sand mold is easily damaged by the high temperature molten steel, resulting in the scrapping of the casting

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0012] A clay molding sand for steel casting, which is composed of raw materials with the following weight (kg): quartz sand 70, forsterite sand 30, bentonite 10, composite powder 6, talcum powder 5, nano-alumina 2, pine sawdust 4, α - Starch 3, dextrin 1.5, calcium phosphate 4, pulp waste liquid 2, water 6;

[0013] The preparation method of the composite powder is as follows: a. Take perlite, fluorite and barite in a weight ratio of 6:4:2, mix them uniformly, pulverize them through a 150 mesh sieve, and then add water to beat to make a solid content of 55%. Slurry, high-speed ball milling for 2 hours, spray drying; b. Add 4% coconut shell powder, 3% calcium fluoride, 1.5% coal powder and 0.6% yttrium oxide to the spray-dried powder, and calcined at 860°C for 35min , and then heated to 1220°C for calcination for 3 hours, quenched in water, then placed in a hydrochloric acid solution with a concentration of 18%, heated to boiling and ground at a high speed for 25 minutes, and...

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Abstract

The invention discloses clay molding sand for cast steel and a preparation method thereof. The clay molding sand is prepared from the following raw materials in parts by weight: 60-80 parts of quartz sand, 20-30 parts of forsterite sand, 8-12 parts of bentonite, 5-8 parts of composite powder, 4-6 parts of talcum powder, 2-3 parts of nanometer aluminum oxide, 3-5 parts of pine sawdust, 2-4 parts of alpha-starch, 1-2 parts of dextrin, 3-6 parts of calcium phosphate, 1.5-2.5 parts of sulfite lye and 4-8 parts of water. The molding sand is high-temperature resistant, high in strength and high in impact resistance, can be used for overcoming the defects on hot spot parts and avoiding sand adhesion, and a phenomenon that the sand mold is broken due to impact force of liquid steel casting is avoided. Moreover, the clay molding sand is low in air release amount, good in air permeability effect and high in liquidity, the defects of air holes, cold shut and shrinkage porosity in the casting can be effectively overcome, and the yield of the casting is improved.

Description

technical field [0001] The invention relates to a molding sand and a preparation method thereof, in particular to a clay molding sand for steel casting and a preparation method thereof. Background technique [0002] Molding sand is the material used for molding in the casting process. It is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. The quality of molding sand directly affects the performance of castings, such as sand holes, pores, sand inclusions, sand sticking, cracks and other defects. Because the impact strength and heat resistance of the molding sand in the prior art are not high enough, the sand mold is easily damaged by the high-temperature molten steel, causing the casting to be scrapped. Contents of the invention [0003] The object of the present invention is to provide a high impact resistance, high temperature resistant clay molding sand for steel casting and a...

Claims

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Application Information

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IPC IPC(8): B22C1/02B22C1/26
Inventor 吴寿涛
Owner TONGLING JINGWEI FLUID SCI & TECH
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