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Molding sand with used sand recycled

A technology of used sand and molding sand, applied in the field of molding sand, which can solve the problems of declining performance of used sand, increasing product defect rate, increasing manufacturing cost, etc., and achieves the effects of improving hardening, reducing sand cleaning hours, and reducing direct costs

Inactive Publication Date: 2015-11-18
HEFEI CITY TENVER PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to save costs, people will recycle the old sand, because the performance of the used old sand has declined, if it is not used properly, it will increase the defective rate of the product and increase the manufacturing cost

Method used

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Experimental program
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Effect test

Embodiment Construction

[0017] A kind of mold sand that reuses old sand is made up of the following substances by weight:

[0018] 125 parts of old sand, 100 parts of quartz sand, 20 parts of diopside, 25 parts of pyrophyllite, 38 parts of plant straw, 32 parts of carboxymethyl starch, 23 parts of microcrystalline cellulose, 17 parts of hydrogenated rosin, 15 parts of furfuryl alcohol resin ;

[0019] Its preparation method is:

[0020] (1) Mix 125 parts of old sand and 100 parts of quartz sand and put them into a high-speed mixer at a controlled speed of 380rpm. After stirring for 15 minutes, the mixed sand is ready for use;

[0021] (2) Mix the mixed sand with 20 parts of diopside and 25 parts of pyrophyllite and put it into the calciner. After calcining for 2 hours, take out the calcined material by crushing and sieving it for later use;

[0022] (3) Air-dried and pulverized plant straws, passed through a 60-mesh sieve, mixed with 32 parts of carboxymethyl starch and 23 parts of microcrystalline...

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Abstract

The invention discloses molding sand with used sand recycled. The molding sand is composed of, by weight, 120-130 parts of the used sand, 100-110 parts of quartz sand, 15-20 parts of diopside, 25-30 parts of pyrophyllite, 35-45 parts of plant straw, 30-40 parts of carboxymethyl starch, 20-25 parts of microcrystalline cellulose, 15-20 parts of hydrogenated rosin and 10-15 parts of furfuryl alcohol resin. According to the molding sand, the used sand and waste are reasonably utilized, the direct cost is greatly lowered, and the environment is protected. Besides, the compositions are reasonably matched, and performance is good. The phenomenon of insufficient performance when the used sand is recycled is effectively avoided. The defects of peeling, sand inclusion, sand burning and the like are reduced. The rate of finished castings is increased, and the degree of finish of the castings is improved. The sand removing man-hour is shortened, cost is lowered indirectly, and high economic value is achieved.

Description

technical field [0001] The invention relates to a molding sand, in particular to a molding sand for recycling old sand. Background technique [0002] Molding sand is a material used for molding in casting. Molding sand is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion, and natural silica sand containing clay can also be used. Inappropriate, the diameter of the molding sand is too large. Although the air permeability is good, the surface of the casting is rough and the finish is not good. The diameter of the molding sand is too small, resulting in poor air permeability of the sand mold and pores in the casting. Coal powder clay green sand, which is widely used at home and abroad, is generally made of raw sand, binders, coal powder additives, etc. and water. It has a certain anti-sticking sand effect, low material cost, and high production efficiency. However, its consumption is lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C5/00B22C5/04
Inventor 孙爱琴
Owner HEFEI CITY TENVER PRECISION CASTING
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