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Method and device for pneumatic bulging after head casting

A head and bulging technology, which is applied in the direction of manufacturing tools and other manufacturing equipment/tools, can solve the problems of low weld strength, low material utilization rate, and high labor intensity, so as to reduce labor intensity and material consumption , the effect of improving production efficiency

Inactive Publication Date: 2012-08-01
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0003] In order to solve the problems of low material utilization rate, low production efficiency, low weld strength, and high labor intensity in the process of large-scale head processing, the present invention proposes a method and device for air bulging of the head after casting

Method used

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  • Method and device for pneumatic bulging after head casting
  • Method and device for pneumatic bulging after head casting
  • Method and device for pneumatic bulging after head casting

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Embodiment Construction

[0014] The alloy is prepared and melted according to the proportion of the design requirements, and the metal melt heated to the pouring temperature is poured into the casting mold composed of the casting upper mold (13), the base (5) and the core (7). During the pouring process, Close the valve (10) connected to the pressure gas source (11), open the vacuum pump (9) and valve (8) to pump out the gas in the mold through the main air pipe (6) installed inside the core, so that the pressure inside the cavity less than atmospheric pressure. When the temperature of the molten metal in contact with the casting upper mold (13) is lower than the crystallization temperature by 10 to 360 degrees, the casting upper mold is quickly replaced with a bulging upper mold (15), and the replaced bulging upper mold (15) The final dimensions of the cavity and the head are the same, but an annular groove with a height less than 80 mm and a width less than 60 mm should be set to fix the head blank ...

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Abstract

The invention relates to a method and a device for pneumatic bulging after head casting, in particular to a method and a device for refining crystal structure of a casting by pneumatic bulging to improve strength, which belong to the technical field of pressure container manufacturing. Alloys are prepared and melted according to a required proportion, metal melt heated to pouring temperature is poured into a mould composed of an upper casting mould, a base and a core, gas in the mould is exhausted through a man gas pipe disposed inside the core during pouring, and accordingly interior pressure of a cavity is smaller than atmospheric pressure. When the temperature of the metal melt in contact with the upper casting mould is lower than 10-360 DEG C of crystallization temperature, the upper casting mould is quickly replaced with an upper bulging mould. The surface of a cavity of the replacement upper bulging mould is the same as a final shape of a head in size. A cavity of a head blank is gradually filled with pressure gas through the main gas pipe disposed inside the core. Under the bulging action of the pressure gas, the head blank deforms in a thermoplastic way and finally in the same shape as the inner cavity of the upper bulging mould.

Description

technical field [0001] The invention relates to a method and a device for air pressure bulging of a head after casting, in particular to a method and a device for refining the crystal structure of a casting and improving the strength by using the air pressure bulging technology, belonging to the technical field of pressure vessel manufacturing. Background technique [0002] The head forming process is an important part of the pressure vessel manufacturing process, and its quality directly determines the safety of the pressure vessel. At present, the small heads mainly adopt the direct stamping technology of steel plates. Due to the limitation of the processing capacity of the stamping equipment, the large heads have to be stamped with steel plates separately, and then accurately cut, welded and formed after assembly. It causes problems such as low material utilization rate, low production efficiency, low weld strength and high labor intensity in the process of large-scale he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/00B21D22/02
Inventor 陈海峰李九良张士玺张功学乔丽洁李瑞虎雷静
Owner SHAANXI UNIV OF SCI & TECH
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