Local extrusion method used for high-pressure casting

A technology of high-pressure casting and extrusion method, which is applied in the field of casting, which can solve the problems of uneven wall thickness, short solidification time, complex structure, etc., and achieve the effects of improving the economic benefits of enterprises, reducing shrinkage defects, and reducing the production scrap rate

Inactive Publication Date: 2017-02-15
CITIC DICASTAL
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Problems solved by technology

At present, due to the complex structure of die castings, uneven wall thickness, and short solidification time, for the "hot spot" position in the product structure, methods such as high pressure feeding, optimizing runner structure, and enhanced cooling are often used to However, it is often difficult to achieve feeding at the far gate by adjusting process parameters, and the porosity is difficult to meet the increasing requirements of OEM customers

Method used

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  • Local extrusion method used for high-pressure casting
  • Local extrusion method used for high-pressure casting

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Embodiment Construction

[0023] Test group 1

[0024] Partial extrusion structure for aluminum alloy high pressure casting includes extrusion boss (02), extrusion core sleeve (03), extrusion rod (04), extrusion cylinder (05), extrusion cylinder piston (06) . The cross-sectional area ratio of the extrusion cylinder piston (06) to the extrusion rod (04) is 12 to ensure sufficient extrusion force. When the cylinder piston is not squeezed (at zero position), the front end of the extrusion rod (08) is 10mm higher than the end surface of the extrusion sleeve (10), and at the same time the front end of the extrusion rod (08) is in contact with the inner wall of the lower cavity of the extrusion core sleeve Cavity (12) is formed between (11); in the extruding process of extruding rod, the gap between the lower cavity inner wall (11) of extruding core sleeve and extruding rod (04) outer contour is within 10mm ( That is, the extrusion boss (02) wall thickness range). In order to ensure that the local extrusi...

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Abstract

The invention provides a local extrusion method used for high-pressure casting. The method comprises the steps that a local extrusion device used for high-pressure casting is used for extruding the surface of a casting. The device is composed of an extrusion core sleeve (03), an extrusion rod (04), an extrusion oil cylinder (05) and an extrusion oil cylinder piston (06) and is characterized in that the extrusion oil cylinder (05) internally comprises the extrusion oil cylinder piston (06), the extrusion oil cylinder piston (06) is connected with the extrusion rod (04), the extrusion rod (04) is located in the extrusion core sleeve (03), and the extrusion core sleeve (03) and the extrusion oil cylinder (05) are fixed; the extrusion oil cylinder piston (06) is driven to drive the extrusion rod (04) to complete extrusion. The method has the beneficial effects that the extrusion stroke of the local extrusion process can be effectively ensured, meanwhile, the shrinkage defect of the large and thick portion of products is reduced, the production rejection rate is reduced, and the enterprise economic benefits are obviously improved.

Description

technical field [0001] The invention relates to the field of casting, in particular to a partial extrusion method for high-pressure casting. Background technique [0002] Mold is an indispensable process equipment in modern industry, especially automobile, radio, aviation, instrument, daily necessities and other industries. At present, due to the complex structure of die castings, uneven wall thickness, and short solidification time, for the "hot spot" position in the product structure, methods such as high pressure feeding, optimizing runner structure, and enhanced cooling are often used to However, it is often difficult to achieve feeding at the far gate by adjusting process parameters, and the porosity is difficult to meet the increasing requirements of OEM customers. Contents of the invention [0003] Aiming at the above-mentioned technical requirements of aluminum alloy die-casting, the present invention proposes a local extrusion method for high-pressure casting mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D17/20
CPCB22D17/20
Inventor 戴川张凤君王永宁朱志华李昌海
Owner CITIC DICASTAL
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