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Low pressure casting wheel cooling technology

A technology, water mist cooling technology, applied in the field of casting cooling technology, can solve the problems of easy cracking of the mold, short life, easy corrosion of the mold, low cooling intensity, etc., to reduce the pinhole scrap rate, rework rate, and shrinkage defect probability Small, the effect of improving mechanical properties

Active Publication Date: 2010-09-22
BAODING CITY LIZHONG WHEEL MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, 85% of aluminum alloy wheels are produced by low-pressure casting. In the cooling mode of low-pressure casting mold, it is mainly divided into air cooling and water cooling. The low strength limits the improvement of the mechanical properties of the product, and the air compressor station has a large investment, high cost, and loud noise on site; the cooling strength of the water-cooling process is high, which can effectively improve the mechanical properties of the product, and all the cooling water flows in the pipeline. Noise, but the cooling intensity of the water-cooling process is too large, it is difficult to control during production, and shrinkage cavities and shrinkage defects are prone to appear inside the wheel castings. The water-cooling process also has high requirements for molds and equipment, and the mold is prone to corrosion, and the mold is prone to cracking and has a short life. The connecting pipes are prone to dripping or scale blockage, and the water-cooled return pipe is not easy to realize in the narrow part of the mold space, so there are many defects in the water-cooling process of low-pressure casting molds

Method used

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  • Low pressure casting wheel cooling technology
  • Low pressure casting wheel cooling technology

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Experimental program
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Effect test

Embodiment 1

[0017] Use water mist cooling device to cool the mold, including bottom mold riser wind 3, bottom mold middle circle wind 4 upper mold center wind 14, upper mold five-hole wind 13, upper mold middle circle wind 15, side mold wind 7 use water mist Cooling, the rest of the bottom mold with a small amount of ventilation is air-cooled from 470°C to 470°C within 40 seconds. Cooling to 430°C, the mold temperature is reduced by 40°C.

[0018] The water temperature of the cooling water tank is 50°C; the ratio of water and air is 1:800.

Embodiment 2

[0020] Use water mist cooling device to cool the mold, including bottom mold center air 4, upper mold center air 14, upper mold five-hole air 13, upper mold middle circle air 15, use water mist to cool, and other bottom molds with small ventilation Large circle wind 5, bottom mold outer circle wind 6, upper mold large circle wind 12, upper mold outer circle wind 11 air ducts use air cooling, side mold wind 7, 8 use water cooling, so that the mold can be cooled from 480 ℃ within 50 seconds To 420°C, the mold temperature is reduced by 60°C.

[0021] The water temperature of the cooling water tank is 25°C; the ratio of water and air is 1:700.

Embodiment 3

[0023] Use a water mist cooling device to cool the mold, including the bottom mold middle circle air 4, the upper mold five-hole air 13, the upper mold middle circle air 15 are cooled by water mist, and the rest of the bottom mold with small ventilation volume big circle wind 5, bottom mold The outer ring air of the mold 6, the large ring air of the upper mold 12, the air duct of the outer ring of the upper mold 11 use air cooling, the riser air of the bottom mold 3, the center air of the upper mold 14, and the side mold air 7, 8, 9 use water cooling, so that the mold Cooling from 490°C to 410°C in 60 seconds, the mold temperature drops by about 80°C.

[0024] The water temperature of the cooling water tank is 1°C; the ratio of water and air is 1:600.

[0025] Drill 3 holes according to the width of the mold spokes for water cooling.

[0026] The overall mechanical properties of the products obtained in the above three embodiments are all higher than those obtained by simple ...

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Abstract

The invention discloses a mist-spraying cooling technology, which utilizes an electromagnetic type quantitative pump to pump water into an air and water mixing cooling channel so as to form water mist to be used as cooling medium, and is used for cooling a die by aiming at different air ducts via utilizing water mist cooling or air cooling, so the die is cooled to 430 DEG C-410 DEG C from 490 DEG C-470 DEG C within 40-60 seconds, and the temperature of the die is reduced about 40-80 DEG C. The invention utilizes the mist-spraying cooling technology to control the cooling rate so as to quench the die and can crystallize according to the progressive solidification principle, so an R angle is generated, and the shrinkage porosity defect probability of a rim part is smaller; and the cooling medium is the mixture of water and air and is directly acted on the surface of the die, so the mechanical property of a blank is correspondingly improved, the pinhole scrappage and rework rate are reduced, and the service life of the die is obviously prolonged at the same time.

Description

technical field [0001] The invention relates to a casting cooling process, in particular to a low-pressure casting wheel cooling process. Background technique [0002] At present, 85% of aluminum alloy wheels are produced by low-pressure casting. In the cooling mode of low-pressure casting mold, it is mainly divided into air cooling and water cooling. The low strength limits the improvement of the mechanical properties of the product, and the air compressor station has a large investment, high cost, and loud noise on site; the cooling strength of the water-cooling process is high, which can effectively improve the mechanical properties of the product, and all the cooling water flows in the pipeline. Noise, but the cooling intensity of the water-cooling process is too large, it is difficult to control during production, and shrinkage cavities and shrinkage defects are prone to appear inside the wheel castings. The water-cooling process also has high requirements for molds and...

Claims

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Application Information

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IPC IPC(8): B22D18/04B22D27/04
Inventor 臧立根
Owner BAODING CITY LIZHONG WHEEL MFG
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