Seven major auto parts processing technology (1)

A car is composed of more than 10,000 parts and components, and each part must be processed through different processes before it can be assembled on the car. Today, let’s learn about the seven major auto parts processing technologies.

1. About casting

Casting is a production method in which molten metal is poured into the cavity of a mold and cooled and solidified to obtain a product.

In the automobile manufacturing process, there are many parts made of cast iron, which account for about 10% of the total vehicle weight, such as cylinder block, transmission case, steering gear housing, rear axle housing, brake drum, various brackets, etc. .

Sand molds are usually used to manufacture iron castings. The raw material of the sand mold is mainly sand, mixed with binder, water, etc. The sand material must have a certain adhesive strength so that it can be molded into the required shape and can withstand the erosion of high-temperature molten iron without collapsing. In order to mold a cavity in the sand mold that matches the shape of the casting, wood must be used to make a model, which is called a wooden mold. The volume of the hot molten iron will shrink after cooling. Therefore, the size of the wooden mold needs to be increased according to the shrinkage rate on the basis of the original size of the casting, and the surface that needs to be cut is thickened accordingly.

Hollow castings need to be made into sand cores and corresponding core wooden molds (core boxes). With wooden molds, cavity sand molds can be turned (casting is also called "sand casting"). When making the sand mold, it is necessary to consider how to separate the upper and lower flasks to take out the wooden mold, and also consider where the molten iron flows in and how to fill the cavity in order to obtain high-quality castings. After the sand mold is made, it can be poured, that is, the molten iron is poured into the cavity of the sand mold. When pouring, the temperature of molten iron is 1250-1350 degrees, and the temperature is higher during smelting.

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