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Easy-to-fill precoated sand and preparation process thereof

A coated sand, filling technology, applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the difficult to meet the shape wall thickness difference sand core production process, coated sand strength, stiffness, refractoriness, The amount of deformation and fluidity can not meet the needs and other problems, so as to achieve the effect of easy shaking and sand cleaning, small deformation, and improved high temperature performance

Active Publication Date: 2014-03-26
ANSHUN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coated sand and its preparation method provided by the above-mentioned patented technology, the strength, stiffness, refractoriness, deformation and fluidity of the coated sand cannot meet the needs, and it is difficult to meet the needs of sand cores with complex shapes and large differences in wall thickness. Production Process

Method used

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  • Easy-to-fill precoated sand and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] An easy-to-fill coated sand, including raw sand, phenolic resin, curing agent, lubricant and additives, the raw sand is composed of 20% pearl sand and 80% scrubbing sand, and the amount of resin added is 1.2% of the weight of the raw sand , the amount of lubricant added is 0.05% of the original sand mass. The amount of curing agent added is 10% of the amount of resin added. Among them, the thermal expansion coefficient of pearl sand is small, and its performance is comparable to that of zircon sand. When it is used to prepare molding sand, castings will not produce expansion defects. The sand particles are spherical, with good fluidity, easy to pound, and good air permeability. The binder can be evenly covered. Pearl sand is a neutral material. Both acid and alkali binders can be used. It has good recycling performance, high cost performance, high refractoriness, easy to collapse, high thermal conductivity, and good stability. No cracking; scrubbing sand is made of nat...

Embodiment 2

[0034] An easy-to-fill coated sand, including raw sand, phenolic resin, curing agent, lubricant and additives, the raw sand is composed of 30% pearl sand and 70% scrubbing sand, and the amount of resin added is 1.6% of the weight of the raw sand , the amount of lubricant added is 0.2% of the original sand mass. The amount of curing agent added is 20% of the amount of resin added. Among them, the thermal expansion coefficient of pearl sand is small, and its performance is comparable to that of zircon sand. When it is used to prepare molding sand, castings will not produce expansion defects. The sand particles are spherical, with good fluidity, easy to pound, and good air permeability. The binder can be evenly covered. Pearl sand is a neutral material. Both acid and alkali binders can be used. It has good recycling performance, high cost performance, high refractoriness, easy to collapse, high thermal conductivity, and good stability. No cracking; scrubbing sand is made of natu...

Embodiment 3

[0037]An easy-to-fill coated sand, including raw sand, phenolic resin, curing agent, lubricant and additives, the raw sand is composed of 25% pearl sand and 75% scrubbing sand, and the amount of resin added is 1.4% of the weight of the raw sand , the amount of lubricant added is 0.1% of the mass of the original sand. The amount of curing agent added is 15% of the amount of resin added. Among them, the thermal expansion coefficient of pearl sand is small, and its performance is comparable to that of zircon sand. When it is used to prepare molding sand, castings will not produce expansion defects. The sand particles are spherical, with good fluidity, easy to pound, and good air permeability. The binder can be evenly covered. Pearl sand is a neutral material. Both acid and alkali binders can be used. It has good recycling performance, high cost performance, high refractoriness, easy to collapse, high thermal conductivity, and good stability. No cracking; scrubbing sand is made o...

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Abstract

The invention discloses easy-to-fill precoated sand and a preparation method thereof. Raw materials comprise roughing sand, phenolic resin, curing agents, lubricating agents and additives. The preparation method comprises the following steps that the roughing sand is heated to 130 to 170 DEG C, then, the phenolic rein, a half quantity of the lubricating agents, the curing agents and the rest half quantity of lubricating agents are sequentially added, finally, the discharging is carried out, and then, crushing, sieving and package are carried out. Through the improvement on the raw material ingredients and the preparation process, the forming intensity of the precoated sand is high, the high-temperature intensity is high, the deformation quantity is small, the flowability is good, complicated sand cores can be produced, the surface smoothness of the molding sand is good, the collapsibility performance is excellent, castings can be easily subjected to the vibration sand falling treatment, the precoated sand gas producing quantity is reduced, and the high-temperature performance and other casting performance of the precoated sand are improved.

Description

technical field [0001] The invention relates to a casting sand and a preparation method thereof, in particular to an easy-fillable coated sand and a preparation process thereof. Background technique [0002] Coated sand refers to the molding sand or core sand covered with a layer of solid resin film on the surface of the sand grains before molding. The mixing method has gone through four stages: dry mixing method, cold coating method, warm coating method and hot coating method At present, almost all the production of coated sand adopts thermal coating method. Due to the advantages of high strength, low gas generation, high production efficiency, high dimensional accuracy of produced castings, good surface quality, and easy storage, coated sand has been widely used in complex precision castings such as automobile engines in recent years. [0003] At present, many domestic enterprises or individuals have applied for patents related to coated sand. For example, the invention p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02B22C1/22B22C5/04
Inventor 张殿喜李文仲郭宗富李浩如张在玉杨路中周士芸唐晓亮闫万珺杨秀凡吴玛佳
Owner ANSHUN UNIV
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