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Molding sand capable of preventing sand penetration of cylinder pedestal casting

A technology of cylinder block and molding sand, which is applied in the field of parts casting production, and can solve the problems of high product scrap rate and easy sand sticking

Inactive Publication Date: 2017-08-04
黄石东贝铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a molding sand that can prevent the cylinder block castings from sticking to the problem that the current molding sand is easy to produce sand when producing cylinder block castings, resulting in a high scrap rate of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A kind of molding sand of this embodiment that can prevent cylinder block castings from sticking to sand, the mass fraction of each component is: old sand 96.85%, silica sand 1.0%, bentonite 0.8%, coal powder 0.35%, water 1.0%. Mix the above components in a sand mixer, set the compaction rate to 35%, the mixing time to 120s, the amount of water added to the shakeout drum to 20L, the opening of the dust removal main fan to 75%, and the wind speed to 17.5m / s, after 2 days of circulating sand mixing, the molding sand is obtained. The mud content of the molding sand is 11.4%, the water content is 3.4%, the content of bentonite is 7.8%, the average particle size is 64.8 mesh, and the loss on ignition is 4.5%. , the compaction rate of the molding sand is 32-35%, the wet compressive strength is 165-178KPa, and the air permeability is 110-135. Using this molding sand to produce L-type cylinder block castings, a total of 9,040 cylinder block castings were produced. After normal ...

Embodiment 2

[0016] A kind of molding sand of this embodiment that can prevent cylinder block castings from sticking to sand, the mass fraction of each component is: old sand 96.0%, silica sand 1.5%, bentonite 0.7%, coal powder 0.4%, water 1.4%. Mix the above components in a sand mixer, set the compaction rate to 35%, the mixing time to 120s, the amount of water added to the shakeout drum to 20L, the opening of the dust removal main fan to 75%, and the wind speed to 17.5m / s, after 2 days of circulating sand mixing, the molding sand is obtained. The mud content of the molding sand is 11.7%, the water content is 3.3%, the bentonite content is 7.5%, the average particle size is 67.3 mesh, and the loss on ignition is 3.8%. , the compaction rate of the molding sand is 32-34%, the wet compressive strength is 163-175KPa, and the air permeability is 106-125. Using this molding sand to produce F-type cylinder block castings, a total of 13,200 cylinder block castings were produced. After normal shot...

Embodiment 3

[0020] A kind of molding sand of this embodiment that can prevent cylinder block castings from sticking to sand, the mass fraction of each component is: used sand 98.0%, silica sand 0.5%, bentonite 0.9%, coal powder 0.3%, water 0.3%. Mix the above components in a sand mixer, set the compaction rate to 35%, the mixing time to 120s, the amount of water added to the shakeout drum to 20L, the opening of the dust removal main fan to 75%, and the wind speed to 17.5m / s, after 2 days of circulating sand mixing, the molding sand is obtained. The mud content of the molding sand is 12.0%, the water content is 3.5%, the bentonite content is 8.0%, the average particle size is 62.8 mesh, and the loss on ignition is 4.2%. , the compaction rate of the molding sand is 34-36%, the wet compressive strength is 168-178KPa, and the air permeability is 122-139. The molding sand was used to produce H-type cylinder block castings, and a total of 12,400 cylinder block castings were produced. After norm...

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Abstract

The present invention discloses a molding sand capable of preventing sand penetration of a cylinder pedestal casting. The mass fractions of used sand, silica sand, bentonite, pulverized coal and water are 96-98%, 0.5-1.5%, 0.7-0.9%, 0.3-0.4%, and 0.3-1.4% respectively, and the total of the mass fractions of the above components is 100%. The molding sand is obtained after mixing the above components, and as for the molding sand, a silt content is 11-12%, a water content is 3.2-3.6%, a bentonite content is 7.5-8.0%, an average particle size is 62-68 meshes, a loss on ignition is 3.5-4.5%, a sand compactibility is 32-36%, a green compression strength is 160-180 KPa, and an air permeability is 100-140. With adoption of the molding sand provided by the invention, sand penetration of the cylinder pedestal casting can be effectively prevented, a rejection rate of the cylinder pedestal casting is reduced at the same time, the production cost is thus lowered, and the molding sand can adapt to fast and efficient production.

Description

technical field [0001] The invention relates to the technical field of component casting production, in particular to a molding sand that can prevent cylinder seat castings from sticking to sand. Background technique [0002] Refrigerator compressors are mainly composed of motors, housings, cylinder block castings, crankshaft castings, etc. The cylinder block castings are the skeleton of the compressor, connecting the motor, crankshaft, pistons and other components. Since the cylinder block castings are equipped with compression chambers and The muffler cavity is the main component of the compressor. Due to the function of the cylinder block casting, the shape of the silencer cavity of the cylinder block casting is complex, and the ratio of depth to diameter is large. In the vertical parting green sand molding process, the sand in the silencer cavity is difficult to be compacted. After pouring, the casting is prone to sand sticking defects , and the compressor has high requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/02
CPCB22C1/00B22C1/02
Inventor 欧阳晋袁海喜赵景洪
Owner 黄石东贝铸造有限公司
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