Automobile precision parts processing 7 technology introduction
There are more than 10,000 precision parts of a car, and its parts are divided into two parts: frame, exterior plate, chassis, engine, interior, glass, tyre, etc.Every parts by different process molding, to assemble in the car, mold accessories manufacturers today changsha borun embellish together with you to get to know the car parts processing 7 big craft.
1. casting
Casting is the casting of molten metal into the cast cavity, cooling solidification and obtaining the production method.
In the process of automobile manufacture, there are a lot of parts is made of cast iron blank which accounts for about 10% of whole vehicle weight around, such as cylinder block, transmission box, steering gear housing, rear axle shell, brake drum, all kinds of stents, etc.
Cast iron is usually made of sand.The sand - type material is mainly sand, and is mixed with binder, water and so on.The sand type material must have a certain adhesive strength, so that it can be molded into the desired shape and can resist the hot iron water erosion without collapse.In order to shape the cavity in the sand mold to fit the casting shape, the model must be made of wood, which is called wood mould.The size of the hot molten iron will be reduced after cooling. Therefore, the size of the wood mould needs to be enlarged on the basis of the original size of the casting, and the surface of the cutting process needs to be thickened accordingly.
Hollow castings need to be made of sand cores and corresponding cores (core boxes).With the wood mold, you can turn the cavity sand mold (casting is also known as "turning sand").When making sand, consider how to separate the upper and lower sand boxes to remove the wood mold, and consider where the molten iron is flowing in, and how to fill the cavity to get high-quality castings.After the sand mold is made, it can be poured, which is to pour molten iron into the sand type cavity.When pouring, the iron water temperature is 1250-1350 de