CN105618668A - High-strength foundry sand - Google Patents

Abstract

The invention discloses high-strength foundry sand. The high-strength foundry sand comprises roughing sand, a functional component and an adhesive. The roughing sand comprises fresh sand and reclaimed sand; the fresh sand comprises the following components in parts by weight: 100-110 parts of silica sand, 6-10 parts of zircon sand, 10-15 parts of forsterite sand, 5-7 parts of emery, 3-5 parts of grog refractory and 3-5 parts of carbon sand; the functional component is a combustible substance containing carbon fibers; and the adhesive is a mixture of phenolic resin, vegetable oil, tower oil and polyvinyl alcohol. The high-strength foundry sand is low in production cost, good in heat thermal conductivity, high in degree of fire resistance and good in acid and alkali resistance, structural stability is improved, air permeability is improved on the premise of guaranteeing the strength of the foundry sand, defects of blow holes are reduced, and yield is improved.

Description

A kind of high-strength casting molding sand

Technical field

The invention belongs to casting technology field, especially relate to a kind of high-strength casting molding sand.

Background technology

At casting field, from a broad sense, every material being used for manufacturing casting mold (comprising core, coating etc.) is referred to as molding material. the casting mold used in Foundry Production has sand mold, metal mold, ceramic mould, gypsum model, graphite mould etc., wherein the most generally and in a large number use sand mold, worldwide, the foundry goods that application sand mold is produced accounts for the 60%-80% that various casting mold produces casting output, 21st century called " Green foundry ", protection of the environment, realize the fundamental state policy that Sustainable development is for we, molding material is to the environmental protection of foundry, green, cleanly production plays important effect, in sand mold casting and lost foam casting are produced, by a large amount of for discharge discarded old sand, if manipulation of regeneration and recycling can not be carried out, physical environment must be brought the destruction of huge pollution, therefore a kind of high strength is developed, environmental protection, the molding material of less contamination is for current present situation, have great significance.

Summary of the invention

Based on above technical problem, the present invention discloses a kind of high-strength casting molding sand, it is possible to obtains high-strength casting sand mold efficiently, and adopts environment-friendly materials, protects environment and re-sources.

The technical scheme that the present invention is complete comprises:

A kind of high-strength casting molding sand, comprises roughing sand, the first function ingredients, the 2nd function ingredients, binding agent;

Described roughing sand comprises fresh sand and reclaimed sand, and described fresh sand and reclaimed sand mass ratio are (65-80): (35-20);

Described fresh sand comprises silica sand 100-110 part by weight, zircon sand 6-10 part, forsterite sand 10-15 part, emergy 5-7 part, fire-resistant grog 3-5 part, carbonaceous sand 3-5 part;

Bauxitic clay and the coal gangue mixture of described fire-resistant grog to be mass ratio be 2:1, wherein in bauxitic clay, alumina content is 75%, and refractoriness is greater than 1850 degree,

Described carbonaceous sand is graphite or coke, granularity is 160-200 order,

Described reclaimed sand granularity is 180-240 order.

The first described function ingredients is the combustiblesubstance containing carbon fiber,

The 2nd described function ingredients diatomite or one to two kind of attapulgite, granularity is 80-120 order, and it accounts for the 3-5% of roughing sand total mass,

Described binding agent is the mixture of resol, vegetables oil, tower oil, polyvinyl alcohol, and volume ratio is (60-65): (4-6): (2:-3): (10-15).

The described combustiblesubstance containing carbon fiber is thin wood chip and agricultural crop straw, and thin wood chip granularity is 160-200 order, and crop branch fiber diameter is 4-6mm.

Hinge structure of the present invention, adopt the silica sand of appropriate level as roughing sand principal constituent, reduce production cost, and the zircon sand adopting particle diameter little and olivine sand, the coefficient of expansion is little, improve structural stability, thermal conductivity is good, refractoriness height, and olivine sand also improves the anti acid alkali performance of molding sand, fire-resistant grog is loose, improve refractoriness, and it is convenient to knockout process, adopt reclaimed sand, it is beneficial to environmental protection recycling, and fine grain reclaimed sand is conducive to improving mold quality, adopt the porous material such as diatomite or attapulgite as molding sand material simultaneously, reduce the usage quantity of refractory materials, make casting mold lighting, both environmental protection had been conducive to, and adopt rational proportioning, ventilation property is added under the prerequisite ensureing sand bond, reduce bleb defect, add yield rate.

Embodiment

Below in conjunction with embodiment, the present invention will be further described.

A kind of high-strength casting molding sand, comprises roughing sand, the first function ingredients, the 2nd function ingredients, binding agent;

Described roughing sand comprises fresh sand and reclaimed sand, and described fresh sand and reclaimed sand mass ratio are (65-80): (35-20);

Described fresh sand comprises silica sand 100-110 part by weight, zircon sand 6-10 part, forsterite sand 10-15 part, emergy 5-7 part, fire-resistant grog 3-5 part, carbonaceous sand 3-5 part;

In described silica sand, dioxide-containing silica is 90%-95%, and aluminum oxide is less than 5%, and surplus is inevitable impurity, and granularity is 140-180 order, and strict density is more than 1.75g/cm3, and average fineness is 52-55;

In zircon sand, zirconia content is greater than 70%, and silica content is less than 28%, and titanium oxide content is less than 0.3%, and iron oxide content is less than 0.12%, and alumina content is less than 0.2%, and granularity is 240-280 order;

In described olivine sand, content of magnesia is 48-55%, and silica content is less than 45%, and iron oxide content is less than 8%, and granularity is 240-280 order,

In described emergy, alumina content is 99-99.5%, and granularity is 140-180 order;

Bauxitic clay and the coal gangue mixture of described fire-resistant grog to be mass ratio be 2:1, wherein in bauxitic clay, alumina content is 75%, and refractoriness is greater than 1850 DEG C,

Described carbonaceous sand is graphite or coke, granularity is 160-200 order,

Described reclaimed sand granularity is 180-240 order.

The first described function ingredients is the combustiblesubstance containing carbon fiber, thin wood chip, agricultural crop straw, and thin wood chip granularity is 160-200 order, and crop branch fiber diameter is 4-6mm;

The 2nd described function ingredients diatomite or one to two kind of attapulgite, granularity is 80-120 order, and it accounts for the 3-5% of roughing sand total mass,

Described binding agent is the mixture of resol, vegetables oil, tower oil, polyvinyl alcohol, and volume ratio is (60-65): (4-6): (2:-3): (10-15).

Claims (2)

1. a high-strength casting molding sand, comprises roughing sand, the first function ingredients, the 2nd function ingredients, binding agent;

Described roughing sand comprises fresh sand and reclaimed sand, and described fresh sand and reclaimed sand mass ratio are (65-80): (35-20);

Described fresh sand comprises silica sand 100-110 part by weight, zircon sand 6-10 part, forsterite sand 10-15 part, emergy 5-7 part, fire-resistant grog 3-5 part, carbonaceous sand 3-5 part;

Bauxitic clay and the coal gangue mixture of described fire-resistant grog to be mass ratio be 2:1, wherein in bauxitic clay, alumina content is 75%, and refractoriness is greater than 1850 degree,

Described carbonaceous sand is graphite or coke, granularity is 160-200 order,

Described reclaimed sand granularity is 180-240 order.

The first described function ingredients is the combustiblesubstance containing carbon fiber,

The 2nd described function ingredients diatomite or one to two kind of attapulgite, granularity is 80-120 order, and it accounts for the 3-5% of roughing sand total mass,

Described binding agent is the mixture of resol, vegetables oil, tower oil, polyvinyl alcohol, and volume ratio is (60-65): (4-6): (2:-3): (10-15).

2. molding sand as claimed in claim 1, it is characterised in that, the described combustiblesubstance containing carbon fiber is thin wood chip and agricultural crop straw, and thin wood chip granularity is 160-200 order, and crop branch fiber diameter is 4-6mm.