Core sand for automobile engine casting and preparation method of core sand

A technology of automobile engine and core sand, which is applied to casting molding equipment, molds, cores, etc. It can solve the problems of poor finish, poor air permeability of sand molds, and rough surface of aluminum sand parts, so as to achieve good air permeability and reduce Sensitivity, short drying time effect

Inactive Publication Date: 2016-11-16
江阴联华铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the usual core sand formula for casting aluminum, the particle size of the core sand is too large or too small, and the diameter of the core sand is too large. Although the air permeabili

Method used

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  • Core sand for automobile engine casting and preparation method of core sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A core sand for automobile engine casting, prepared from the following parts by weight (kg) of raw materials: forsterite sand 170, graphite sand 40, high magnesium phosphorus tailings 35, skarn 40, waste foamed concrete 25, wood Section clay 40, coal powder 15, coconut bran 16, blast furnace gas ash 14, high alumina fine powder 8, calcium zirconate 10, hollow silica nanosphere 15, sodium silicate 2, aluminum silicate 3, ammonium alginate 3 , Hydroxyethyl cellulose 4, β-cyclodextrin 4, appropriate amount of water.

[0016] A preparation method of core sand for automobile engine casting includes the following steps:

[0017] (1) Mix the high-magnesium phosphorus tailings slag, skarn, and waste foamed concrete evenly, crush them into a particle size of 130-150 mesh, and then add graphite sand, blast furnace gas ash, high alumina fine powder, calcium zirconate, and appropriate amount of water Stir and disperse, smelt the mud, send it to a calciner at 1300-1350°C for calcination...

Embodiment 2

[0021] A core sand for automobile engine casting, prepared from the following parts by weight (kg) of raw materials: forsterite sand 175, graphite sand 47.5, high magnesium phosphorus tailings 37.5, skarn 50, waste foam concrete 27.5, wood Clay 45, coal powder 16.5, coconut bran 18, blast furnace gas ash 15, high alumina fine powder 10, calcium zirconate 12.5, hollow silica nanosphere 16, sodium silicate 2.5, aluminum silicate 4, ammonium alginate 3.5 , Hydroxyethyl cellulose 5, β-cyclodextrin 5.5, appropriate amount of water.

[0022] The preparation method is the same as in Example 1.

Embodiment 3

[0024] A core sand for automobile engine casting, prepared from the following parts by weight (kg) of raw materials: forsterite sand 180, graphite sand 55, high magnesium phosphorus tailings 40, skarn 60, waste foam concrete 30, wood Section clay 50, coal powder 18, coconut bran 20, blast furnace gas ash 16, high alumina fine powder 12, calcium zirconate 15, hollow silica nanosphere 17, sodium silicate 3, aluminum silicate 5, ammonium alginate 4 , Hydroxyethyl cellulose 6, β-cyclodextrin 7, appropriate amount of water.

[0025] The preparation method is the same as in Example 1.

[0026] The performance test results of the foundry core sand prepared in the above Examples 1-3 are shown in the following table:

[0027]

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Abstract

The invention discloses a core sand for automobile engine casting and a preparation method of the core sand. The core sand is prepared from the following raw materials in parts by weight: 170-180 parts of forsterite sand, 40-55 parts of graphite sand, 35-40 parts of high-magnesium phosphate tailing slag, 40-60 parts of skarn, 25-30 parts of waste foam concrete, 40-50 parts of knar clay, 15-18 parts of coal powder, 16-20 parts of coconut coir, 14-16 parts of blast furnace gas ash, 8-12 parts of high-aluminum fine powder, 10-15 parts of calcium zirconate, 15-17 parts of hollow silica nanospheres, 2-3 parts of sodium silicate, 3-5 parts of aluminum silicate, 3-4 parts of ammonium alginate, 4-6 parts of hydroxyethyl cellulose, 4-7 parts of beta-cyclodextrin and a proper amount of water. The core sand disclosed by the invention is good in performance; in the casting process, the amount of gas evolution is small, the drying time is short, the gas permeability is good, and the wet tensile strength is high; meanwhile, the demolding property of a sand mold can be improved, the sensibility to water during pouring can be lowered, and gas holes in a casting can be prevented; and bentonite and sodium water glass are adopted as binders, so that the mold drawing strength and the collapsibility of the core sand can be improved.

Description

Invention field [0001] The invention belongs to the field of foundry industry, and specifically relates to a core sand for automobile engine foundry and a preparation method thereof. Background technique [0002] The cylinder block material of automobile engine should have sufficient strength, good castability and machinability, and the price should be low. Therefore, the commonly used cylinder block materials are cast iron and alloy cast iron. However, the use of aluminum alloy cylinders is more and more common, because aluminum alloy cylinders are light in weight, have good thermal conductivity, and the capacity of the coolant can be reduced. After starting, the cylinder body quickly reaches the working temperature, and the thermal expansion coefficient is exactly the same as that of the aluminum piston. The gap change after heating is small, which can reduce impact noise and oil consumption. Moreover, the thermal expansion is the same as the aluminum alloy cylinder head, and ...

Claims

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Application Information

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IPC IPC(8): B22C1/16B22C1/02B22C1/00
CPCB22C1/167B22C1/00B22C1/02
Inventor 王春基潘桂林
Owner 江阴联华铸造有限公司
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