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Method for casting sand mould by utilizing vacuum-assist pouring

A negative pressure casting and sand molding technology, which is applied to casting equipment, cleaning methods and appliances, chemical instruments and methods, etc., can solve problems such as violent splashing of liquid metal, scrapped castings, and inability to continue pouring operations, etc., to promote environmental governance Effect

Inactive Publication Date: 2010-10-27
姚会元
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the gas generated by the high temperature cannot be discharged smoothly during the pouring process, it will cause the sand mold to choke, the liquid metal will splash violently, the pouring operation cannot continue, and eventually the casting will be stopped and the casting will be scrapped

Method used

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  • Method for casting sand mould by utilizing vacuum-assist pouring
  • Method for casting sand mould by utilizing vacuum-assist pouring
  • Method for casting sand mould by utilizing vacuum-assist pouring

Examples

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Embodiment Construction

[0024] The vacuum purification flue gas pouring platform of the present invention includes a metal box body 15-1 with a bottom, and several gas collecting pipes 15-2 are arranged in the metal box body 15-1, and one end of all gas collecting pipes 15-2 is It is connected with the collection pipe 15-3, and the suction pipe 15-4 which can be connected with the vacuum air supply device is connected with the collection pipe 15-3. The above-mentioned metal box 15-1, air collecting pipe 15-2, collecting pipe 15-3 and exhaust pipe 15-4 are all made of metal materials and integrated by welding. The outside of the gas collecting pipe 15-2 is coated with a wire mesh 15-5, in order to prevent sand grains from being sucked into the pipeline when pumping air, causing harm to the system.

[0025] During use, dry loose sand 16 is packed into the pouring platform 15 cavity, compacted and scraped. Place the sand box (ie sand mold) 8 on the loose sand surface of the pouring platform 15 after fa...

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Abstract

The invention relates to a method for casting sand mould by utilizing vacuum-assist pouring. The technological process thereof includes: the sand mould after moulding, modelling, core setting and mould assembling is placed above a vacuum purification smoke pouring table, a vacuum system is started, negative pressure is applied to the sand mould by virtue of the vacuum purification smoke pouring table, liquid steel is injected into the sand mould by a pouring cup and then solidified, thus the casting process is completed. In the invention, the sand mould is in negative pressure state before pouring, when liquid metal enters into the cavity, sand core and the sand mould can produce gas under the action of high temperature liquid metal, and negative pressure can cause the produced gas to be exhausted at any time, especially the sand core gradually coated in the liquid metal exhausts the gas by virtue of a plurality of core prints, and the whole operation process can be carried out in safe and stable state.

Description

technical field [0001] The invention relates to a casting method using negative pressure to pour sand molds. Background technique [0002] The traditional method of sand casting is to inject liquid metal into the mold cavity from the top of the sand box by using the principle of gravity, and the pouring is completed after the cavity is filled with liquid metal. It is easy to realize the pouring and forming of general castings using the principle of gravity, but it is difficult for castings with cavities, especially cavities with nearly closed shapes. Firstly, the sand core should be made according to the shape of the cavity. When making the core, it is necessary to consider that the gas generated when the high-temperature liquid metal acts on the sand core can be discharged smoothly, and the problem of sand production in the cavity should also be considered. The usual method is to set up some core heads on the sand core to facilitate the discharge of the gas generated durin...

Claims

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Application Information

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IPC IPC(8): B22D18/00B08B15/04B22D45/00
Inventor 姚会元
Owner 姚会元
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