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Gravity casting method and device for piston

A technology of gravity casting and piston, which is applied to casting molding equipment, casting molds, casting mold components, etc., can solve the problems of difficult quality assurance, low process yield rate, low production efficiency, etc., and achieve low cost, high process yield rate, The effect of high yield

Active Publication Date: 2011-08-17
江苏永航轨道交通科技有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This kind of pouring riser system occupies a large weight, the process yield is low, the production efficiency is very low, and the effect is poor, and the quality is difficult to guarantee

Method used

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  • Gravity casting method and device for piston
  • Gravity casting method and device for piston
  • Gravity casting method and device for piston

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Embodiment Construction

[0025] Hereinafter, preferred embodiments of the present invention and its manufacturing method will be described in detail with reference to the drawings.

[0026] The piston of the traditional process cannot guarantee smooth filling and smooth exhaust, and the shrinkage cavity is mainly distributed in the 4 hot joint circles of the lower side ring groove of the piston pin hole. The research combined with the specific production practice, the casting of the aluminum piston manual gravity casting process The cause of the defect was analyzed, the structure of the pouring system was changed, the shrinkage cavity at the thick part of the piston head was effectively eliminated, and the yield and process yield were improved.

[0027] The material of the test sample is Al-Si eutectic alloy which is widely used in engine pistons. This alloy has good castability, weldability and thermal conductivity, and has high strength and good thermal conductivity Corrosion resistance. The piston...

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Abstract

The invention relates to the field of piston casting, in particular to a casting process for a piston, and provides a casting process and a casting device to overcome the defects of shrinkage cavity and shrinkage porosity on a ring slot part near a pin hole. The process and the device are suitable for casting of pistons in gasoline engine industry, diesel engine industry, compressor industry and other industry. In the process, an open type annular feeding passage is formed at the bottom of the piston, and an annular channel opening angle is changed by adjusting a sectorial core at the bottom of the piston, so that the full and reasonable feeding effect is achieved, and the casting yield reaches over 96 percent; and by adopting a blind riser, the process productive rate is improved. The process has the advantages of saving energy, reducing consumption, along with high yield, high process productive rate, low cost and the like.

Description

Technical field [0001] The present invention relates to the technical field of piston casting, and specifically refers to a casting process method and device for eliminating piston shrinkage holes. It is suitable for the casting of pistons in gasoline engines, diesel engines, compressors and other industries. Background technique [0002] Many domestic piston companies mainly use manual molds, which have the advantages of simple methods, simple process equipment, and strong adaptability. Therefore, they are widely used in single-piece or small batch production, especially in the production of large castings and complex castings. The core-pulling gravity casting process is adopted, with the thick top part of the piston facing downwards and the core being drawn upwards. Since the thick part is at the bottom and the thin-walled skirt is at the top, the casting does not comply with the principle of sequential solidification during the solidification process. The thick part at th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22B22C9/08
Inventor 姜银方何艺何玉中钱晓明王匀尹必峰
Owner 江苏永航轨道交通科技有限公司
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