Die-casting process for automobile air conditioner compressor shell

Abstract

The invention discloses a die-casting process for an automobile air conditioner compressor shell. The die-casting process is characterized by comprising the following steps of 1) designing and manufacturing a lower die base; 2) designing and manufacturing a lower die core; 3) designing and manufacturing an upper die base; 4) designing and manufacturing an upper die core; 5) preparing a high-temperature alloy fluid; and 6) die-casting manufacturing of the compressor shell. According to the die-casting process, fine polishing treatment is carried out on the inner surface of the lower die core toreduce the roughness value of the inner surface of the lower die core, after the lower die core is preheated, the inner surface and the outer surface of the lower die core are coated with demolding paste with a good demolding effect, so that a good protective layer is formed on the surface of the lower die core, after a die-casting die gating system is improved through the measures, the filling speed of the die is reduced, meanwhile, the filling time is shortened, die sticking at a sprue of the produced automobile air conditioner compressor shell is greatly relieved, castings are effectivelyfed, the percent of pass of products in actual production is increased to 90% or above from original 60%, and the service life of the die is prolonged.

Description

technical field [0001] The invention relates to the technical field of die-casting technology, in particular to a die-casting technology for a casing of an automobile air-conditioning compressor. Background technique [0002] Die casting is a metal casting process characterized by the application of high pressure to molten metal using the cavity of a mold. Molds are usually machined from stronger alloys, a process somewhat similar to injection molding. Most die castings are ferrous, such as zinc, copper, aluminum, magnesium, lead, tin, and lead-tin alloys and their alloys. Depending on the type of die casting, a cold chamber die casting machine or a hot chamber die casting machine is used. The cost of casting equipment and molds is high, so the die casting process is generally only used for mass production of a large number of products. Manufacturing die-cast parts is relatively easy, generally requiring only four major steps with low incremental cost per item. Die casti...

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Problems solved by technology

[0003] In the prior art, in the production process, after the die-casting of the automobile air-conditioning compressor shell, the phenomenon of mucous membrane at the gate of the casting is serious, and the production is barely carried out after reducing the injection speed and pressure. After the trial processing of the casting, a large amount of shrinkage is found Pore ​​defects. Although the die-casting conditions have been adjusted many times, there are still a certain amount of shrinkage cavities on the inner surface of the product after machining, and the air leakage rate of the product after leakage is as high as 20%, so this problem needs to be solved

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