CN105537502A - Sand casting method of diesel engine component - Google Patents

Abstract

The invention discloses a sand casting method of a diesel engine component. Adopted moulding sand comprises roughing sand, a functional component and a binding agent. The roughing sand comprises fresh sand and reclaimed sand. The fresh sand comprises, by weight part, 100-110 parts of silica sand, 6-10 parts of zircon sand, 10-15 parts of magnesium olivine sand, 5-7 parts of emery, 3-5 parts of grog refractory and 3-5 parts of carbon sand. Combustible matter containing carbon fibers is adopted as the functional component. The binding agent is a mixture of phenolic resin, plant oil, tar and polyvinyl alcohol. According to the sand casting method, the production cost is low; structural stability is improved; thermal conductivity is good; refractoriness is high, and acid and alkali resistance is good; air permeability is increased on the premise of guaranteeing the strength of the moulding sand; blowhole defects of castings are reduced; and the yield is increased.

Description

A kind of sand mould casting method of diesel engine part

Technical field

The invention belongs to casting technology field, especially relate to a kind of sand mould casting method of diesel engine part.

Background technology

At casting field, in broad terms, every material being used for manufacturing casting mold (comprising core, coating etc.) is referred to as Modeling Material.The casting mold used in Foundry Production has sand mold, metal mold, ceramic mould, gypsum mould, 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, 21 century calls " Green foundry ", protection of the environment, realize the fundamental state policy that sustainable development is for we, Modeling Material is to the environmental protection of Foundry Works, green, cleanly production plays important effect, in sand casting and lost foam casting are produced, by a large amount of for discharge discarded old sand, if regeneration process and recycling can not be carried out, the destruction of huge pollution must be brought to natural environment, therefore a kind of environmental protection is developed, the Modeling Material of of low pollution is for current present situation, have great significance.

Summary of the invention

Based on above technical problem, the invention discloses a kind of sand mould casting method of diesel engine part, adopt environment-friendly materials, protect environment and re-sources.

The technical scheme that the present invention is complete comprises:

A sand mould casting method for diesel engine part, is characterized in that, its component content of described engine shell is counted with % by weight: C:2% ~ 2.55%, Si:1.07% ~ 1.2%, Mn0.65% ~ 0.78%, P :≤0.02%, S :≤0.02%, Cr:0.4% ~ 0.15%, Ni:1.8% ~ 2.1%, Mo:1.1% ~ 1.4%, Mg:0.02, all the other are Fe and other inevitable impurity

Adopt electro-smelting to become molten iron the raw material comprising mentioned component, cast iron melting temperature: 1480-1520 DEG C comes out of the stove; Spheroidising, inoculation, the molten iron temperature after spheroidising and inoculation controls at 1380-1450 DEG C, is poured into by molten iron in the sand mold of above-mentioned mould assembling subsequently, and unpack after being cooled to 500-600 DEG C until molten steel solidification, cleaning swage, take out foundry goods;

The molding sand of described sand mold comprises roughing sand, function ingredients and 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, grog refractory 3-5 part, carbon sand 3-5 part;

In described silica sand, dioxide-containing silica is 90%-95%, and aluminium 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 described 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;

Bauxite and the gangue mixture of described grog refractory to be mass ratio be 2:1, wherein in bauxite, alumina content is 75%, and refractoriness is greater than 1850 DEG C;

Described carbon sand granularity is 160-200 order;

Described reclaimed sand granularity is 180-240 order;

Described function ingredients is the combustible containing carbon fiber;

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

Described carbon sand is graphite or coke, granularity is 180 orders.

Hinge structure of the present invention, adopt the silica sand of appropriate level as roughing sand principal component, 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 is high, and olivine sand also improves the anti acid alkali performance of molding sand, grog refractory is loose, improve refractoriness, and be convenient to knockout process, adopt reclaimed sand, be 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 use amount of refractory material, make casting mold lighting, both environmental protection was conducive to, and adopt rational proportioning, gas permeability is added under the prerequisite ensureing sand bond, reduce bleb defect, add yield rate.

Detailed description of the invention

Below in conjunction with detailed description of the invention, the present invention will be further described.

A sand mould casting method for diesel engine part, is characterized in that, its component content of described engine shell is counted with % by weight: C:2% ~ 2.55%, Si:1.07% ~ 1.2%, Mn0.65% ~ 0.78%, P :≤0.02%, S :≤0.02%, Cr:0.4% ~ 0.15%, Ni:1.8% ~ 2.1%, Mo:1.1% ~ 1.4%, Mg:0.02, all the other are Fe and other inevitable impurity

Adopt electro-smelting to become molten iron the raw material comprising mentioned component, cast iron melting temperature: 1480-1520 DEG C comes out of the stove; Spheroidising, inoculation, the molten iron temperature after spheroidising and inoculation controls at 1380-1450 DEG C, is poured into by molten iron in the sand mold of above-mentioned mould assembling subsequently, and unpack after being cooled to 500-600 DEG C until molten steel solidification, cleaning swage, take out foundry goods;

The molding sand of described sand mold comprises roughing sand, the first function ingredients, the second 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, grog refractory 3-5 part, carbon sand 3-5 part;

In described silica sand, dioxide-containing silica is 90%-95%, and aluminium 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;

Bauxite and the gangue mixture of described grog refractory to be mass ratio be 2:1, wherein in bauxite, alumina content is 75%, and refractoriness is greater than 1850 DEG C,

Described carbon 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 combustible 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 second 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 gross mass,

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

Claims (2)

1. a sand mould casting method for diesel engine part, is characterized in that, its component content of described engine shell is counted with % by weight: C:2% ~ 2.55%, Si:1.07% ~ 1.2%, Mn0.65% ~ 0.78%, P :≤0.02%, S :≤0.02%, Cr:0.4% ~ 0.15%, Ni:1.8% ~ 2.1%, Mo:1.1% ~ 1.4%, Mg:0.02, all the other are Fe and other inevitable impurity

Adopt electro-smelting to become molten iron the raw material comprising mentioned component, cast iron melting temperature: 1480-1520 DEG C comes out of the stove; Spheroidising, inoculation, the molten iron temperature after spheroidising and inoculation controls at 1380-1450 DEG C, is poured into by molten iron in the sand mold of above-mentioned mould assembling subsequently, and unpack after being cooled to 500-600 DEG C until molten steel solidification, cleaning swage, take out foundry goods;

The molding sand of described sand mold comprises roughing sand, function ingredients and 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, grog refractory 3-5 part, carbon sand 3-5 part;

In described silica sand, dioxide-containing silica is 90%-95%, and aluminium 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 described 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;

Bauxite and the gangue mixture of described grog refractory to be mass ratio be 2:1, wherein in bauxite, alumina content is 75%, and refractoriness is greater than 1850 DEG C;

Described carbon sand granularity is 160-200 order;

Described reclaimed sand granularity is 180-240 order;

Described function ingredients is the combustible containing carbon fiber;

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

2. the sand mould casting method of a kind of diesel engine part as claimed in claim 2, is characterized in that, described carbon sand is graphite or coke, granularity is 180 orders.