Sealing method used for low-pressure casting

Abstract

The invention relates to a sealing method used between a low-pressure casting crucible and a workbench face and between the workbench face and a casting mould. In the sealing method, the middle part of the entire casting system comprising a crucible, a support plate and a sealed cover plate (the workbench face) generates downward tiny displacement by adding a plurality of strong springs at the bottom of the low-pressure casting crucible and utilizing the self mass of the casting mould or the mass of an additional casting mould to enable the strong springs to generate tiny compression deformation, the tiny displacement causes the support plate and the sealed cover plate to generate elastic deformation so as to generate an upward stress, and the stress can further press a sealing ring between the low-pressure casting crucible and the sealed cover plate and a sealing ring between the sealed cover plate and the casting mould so as to achieve a favorable sealing effect. The invention has low equipment requirement to low-pressure casting, easy realization, lower cost, simple operation and easy popularization.

Description

technical field [0001] The invention relates to a sealing method between a low-pressure casting crucible and a working table, and between the working table and a mold, and belongs to the technical field of metal materials or metallurgy. Background technique [0002] In the production process of low-pressure casting, before pouring, the entire low-pressure system needs to be sealed to ensure that the compressed gas can exert pressure on the alloy liquid smoothly, so as to ensure that the alloy liquid can be filled into the cavity smoothly without leakage or liquid level fluctuations, so Selecting safe and effective sealing materials and methods is critical. In the low-pressure casting system, there are two connection interfaces that need to be sealed, one is the seal between the crucible and the cover (table), and the other is the seal between the cover (table) and the mold. The general method of sealing between the crucible and the cover plate is to set a groove at the cont...

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Problems solved by technology

[0003] The sealing method adopted above has the following deficiencies: (1) For the sealing between the crucible and the cover plate, when locking by bolts, it usually requires the cooperation of multiple people, and the strength of each operator is different, so it is likely to cause the bolts to not be locked. Tight or uneven force, both will affect the sealing effect

(2) For the seal between the cover plate and the mold, the mold is usually preheated at different temperatures before pouring. When the operator tightens the screws for the hot mold, he works in a hot environment. It is easy to produce uneven stress on the fastening bolts, and at the same time, it is easy to cause industrial accidents. However, the method mentioned in US Patent 4,133,370 needs to add additional equipment, which increases the cost of equipment manufacturing and maintenance.

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