The molding of automotive parts is a complex and diverse process involving the application of a variety of technologies and materials. Here are some of the main forming methods:

1. Casting and molding

Casting is a common method for manufacturing parts with complex shapes. In the casting process, the metal is first melted at high temperatures and then poured into a mold to cool and solidify. This molding method is suitable for large parts, such as engine blocks, transmission cases, etc.

2. Forging and molding

Forging is a forming method that uses external force to plastically deform metal. This method is mainly used to manufacture parts with high strength requirements, such as crankshafts, connecting rods, etc. Forging is divided into hot forging, warm forging and cold forging, each method is suitable for different materials and parts.

3. Injection molding

Injection molding is the primary production method for plastic parts. After the plastic raw materials are melted at high temperature, they are injected into the mold and cooled to solidify. This method is suitable for manufacturing parts of various shapes and sizes, such as interior parts, structural parts, etc.

4. Stamping molding

Stamping is mainly used for the manufacture of parts from sheet metal. The metal sheet is placed into the mold through a stamping machine, and pressure is used to deform it into the desired shape. This method is mainly used to manufacture small parts, such as fasteners, springs, etc.

5. Welding and forming

Welding is a process of joining two or more metal parts together. This method is widely used in various structural parts in automobile manufacturing, such as body, frame, etc. Welding processes include arc welding, laser welding, spot welding, etc.

6. Mechanical cutting processing

For some precision parts, such as bearings, gears, etc., precise machining is required. The raw materials are processed into the required shape and precision through cutting, grinding and other methods.

7. Other special molding methods

With the development of science and technology, some new molding methods are gradually used in automobile parts manufacturing, such as additive manufacturing (3D printing), die-casting molding, powder metallurgy molding, etc. These new technologies bring more possibilities to the manufacturing of auto parts.

To sum up, automobile parts are formed in various ways, covering a variety of processes such as casting, forging, injection molding, stamping, welding and machining. Different parts require appropriate molding methods based on their function, material and shape requirements. The development and innovation of these molding processes have provided strong support for the progress of the automobile manufacturing industry.