Low-pressure casting filling-mold air exhaust structure for sand mold and setting method for low-pressure casting filling-mold air exhaust structure

A technology of low-pressure casting and sand molding, which is applied in the setting field of sand-mold low-pressure casting filling and exhausting structures. It can solve problems such as constraints and the inability to use crystallization pressurization, and achieve the effects of saving costs, reducing the amount of sand used, and smooth exhausting.

Active Publication Date: 2012-07-04
NANTONG L S LIGHT METAL FORMING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this process only uses low-pressure filling, which belongs to the low-pressure filling process, and cannot use crystal boosting.
The technology of low-pressure casting, especially sand mold low-pressure casting, has been greatly restricted.

Method used

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  • Low-pressure casting filling-mold air exhaust structure for sand mold and setting method for low-pressure casting filling-mold air exhaust structure
  • Low-pressure casting filling-mold air exhaust structure for sand mold and setting method for low-pressure casting filling-mold air exhaust structure
  • Low-pressure casting filling-mold air exhaust structure for sand mold and setting method for low-pressure casting filling-mold air exhaust structure

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Embodiment Construction

[0015] Such as figure 2 As shown, the sand mold 1 is included, and the top of the sand mold 1 is provided with an exhaust passage connecting the top of the sand mold cavity 11 with the outside world. The exhaust passage is composed of shallow holes 2 and deep holes 3 arranged in sequence from top to bottom. The lower end of the deep hole 3 is connected to the sand mold cavity 11, the upper end of the deep hole 3 is connected to the lower end of the shallow hole 2, and the upper end of the shallow hole 2 is connected to the outside world. The diameter of the shallow hole 2 is smaller than that of the deep hole 3. The drilling direction of shallow hole 2 and deep hole 3 can be vertical or inclined, but shallow hole 2 must be located on the upper surface of sand mold 1.

[0016] The specific steps to set up the exhaust structure are:

[0017] Firstly, at least one exhaust passage is drilled on the upper surface of the sand mold 1 to communicate the mold cavity 11 with the outs...

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Abstract

The invention relates to a method for setting a low-pressure casting filling-mold air exhaust channel for a sand mold. The method comprises the following steps of: vertically drilling at least one deep hole for communicating the highest point of a cavity and the outside in the sand mold; downwards smearing a section of pasty fire resistant material layer in an orifice at the upper end of the deephole; drilling a small-aperture shallow hole communicated with the deep hole in the fire resistant material layer; and heating and hardening the fire resistant material layer, wherein when aluminum liquid rises steadily, the air in the cavity is exhausted from the small-aperture shallow hole; and when the aluminum liquid continuously rises through the deep hole in the sand mold and overflows fromthe small-aperture shallow hole, the aluminum liquid overflowing the plane of the sand mold is solidified quickly due to the relatively small aperture of the small-aperture shallow hole. Therefore, the air can be exhausted steadily during mold filling; after mold filling, the cavity is closed quickly, so that pressurization, pressure retention and crystallization are realized conveniently, and a reliable guarantee is supplied for improving the quality of a product. Furthermore, the height of a cover box sand mold is effectively reduced to 100 to 120 millimeters, the sand using amount of a cover box is reduced greatly, and the cost is saved.

Description

technical field [0001] The invention relates to a sand mold low-pressure casting mold filling and exhaust structure, and also provides a method for setting the sand mold low pressure casting mold filling and exhaust structure. Background technique [0002] Sand mold low-pressure casting is a process that uses compressed air to steadily press the refined aluminum liquid in the crucible into the sand mold through the riser. It has the following advantages: the liquid metal filling is relatively stable; the casting has good formability, which is conducive to the formation of castings with clear contours and smooth surfaces, and is more beneficial to the forming of large thin-walled castings; the casting structure is compact and has high mechanical properties; Liquid process yield. In addition, the working conditions are good; the equipment is simple, and it is easy to realize mechanization and automation. [0003] When filling aluminum castings in sand mold low-pressure casti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/04
Inventor 周素洪翟春江翟春泉陆卫华俞伟冲许丽英
Owner NANTONG L S LIGHT METAL FORMING
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