Whole vacuum negative pressure impregnation equipment and method for die casting type shell

Abstract

The invention discloses whole vacuum negative pressure impregnation equipment and method for a die casting type shell. The equipment comprises an impregnant box (3), an air storage tank (7), an oil cylinder (8) which is arranged above the impregnant box (3) and of which a piston end is connected with the impregnant box (3), a sealing mechanism (1) positioned between the oil cylinder (8) and the impregnant box (3), a control box (4) connected with the oil cylinder (8), and also comprises a vacuum meter (5) and a vacuum pump (6) which are arranged on the control box (4). A cavity inside a die casting type shell (2) can be completely closed by the sealing mechanism (1); the vacuum pump (6) is communicated with the sealing mechanism (1) through the air storage tank (7). All inner cavities of the die casting type shell to be impregnated are sealed before impregnation, so that the problems that die castings, such as shells which are partially assembled, shells of which impregnating adhesives are difficultly cleaned, and shells with large boundary dimensions cannot be subjected to conventional overall impregnation are effectively solved.

Description

technical field [0001] The invention relates to an overall vacuum negative pressure impregnation device and method for a die-casting shell, especially for leaking parts with complex internal structures such as a cylinder body with a bowl-shaped plug installed, a clutch shell with sealed steel balls, and the like. Background technique [0002] In the automobile manufacturing industry, many valves, pumps, and engine casings are made of zinc and aluminum alloy die-casting. Because it is not easy to control the uniform cooling rate during the forming process, the influence of impurities in the alloy, molds and equipment, etc. The reasons for this will lead to defects such as pores, shrinkage cavities, and loose tissue caused by gas inside the casting, which are difficult to detect with the naked eye. The existence of defects will lead to the leakage of the sealed medium, increase the wear of machining tools, and at the same time increase the production cost, making it difficult ...

AI Technical Summary

Problems solved by technology

In addition, the geometric shape of the part also affects the impregnation effect. The thicker the wall of the part, the easier it is to infiltrate, and vice versa, the worse the effect is, because the thinner the wall of the part, the glue will flow out of the part before it is cured, or in the Lost during cleaning

However, especially for leaking parts with complex internal structures such as cylinders with bowl-shaped plugs installed, clutch housings with sealed steel balls, etc., because the impregnating glue cannot effectively leak from narrow and tortuous spaces (such as "L", "T"-shaped structures) etc.), so the traditional overall impregnation method cannot be used to make up for it. Once a leakage problem occurs, such products can only be scrapped, resulting in serious loss of product quality.

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