What are the applications of plastics in auto parts?

2020-01-06 15:44:38

Automobile stamping parts, as the name implies, are the metal stamping parts of automobile parts. In automobile stamping parts, one part is directly formed into automobile parts after stamping, and the other part needs to be welded, machined or painted after stamping. There are many kinds of automobile stamping parts, such as spring tray, spring seat, spring bracket, end cover, cover, compression valve cover, compression valve sleeve, oil seal seat, bottom cover, dust cover, impeller, oil cylinder, support and so on.

The application of plastics in auto parts is developing with the development of auto industry. The strong development of automobile industry puts forward new demands for materials, especially based on the requirements of cost and lightweight. Non-metallic materials such as engineering plastics and composite materials are gradually becoming the new favorite of automobile and parts raw materials. The amount of plastic used in automobile has become an important mark to measure the level of automobile design and manufacture in developed countries. It is reported that by 2020, the average amount of plastic used for automobiles in developed countries will reach more than 500kg / vehicle. Polypropylene (PP), ABS resin, polyvinyl chloride (PVC) and polyethylene (PE) are widely used in automobiles. Obviously, polyolefin materials constitute the main plastic parts of automobiles, and this trend will become more and more obvious in the future.

Plastic is an energy saving material with low relative density, which can be applied to various processing methods, sound absorption, shock proof and heat insulation, excellent electrical insulation and chemical resistance, compound toughening and reinforcement, and low energy consumption in production. Plastic for automobile has become one of the important materials for automobile parts.

Mastering the structure, performance, manufacture and application of various plastics is very important for the design, material selection, production and use of auto parts. In other words, fully understanding the relationship between the plastic structure and performance can enable the auto parts design engineer to correctly select the materials and design the shape, strength and structure of the parts; the parts manufacturer can correctly select the material brand, determine the forming and processing methods, processing technology and processing equipment, formulate the operation procedures, and produce qualified products; the auto parts user can reasonably use them Products to ensure reliable operation.

From a professional point of view, the cold stamping of stamping parts refers to the use of the die on the press to exert a certain pressure on the material to separate or plastic deformation, so as to obtain the desired finished products. Generally speaking, punching and bending are the two processes, which are punching first and then bending, so as to facilitate the processing of CNC punch. However, in some special cases, it is necessary to bend before punching.

If the stamping parts are formed by hot stamping, there are mainly the following in the specific process:

Blanking: that is, stamping the plate into the required contour blank for subsequent processing.

Austenitizing: it includes two stages of heating and heat preservation. Its processing purpose is to heat the material to a suitable temperature, so that it has good plasticity.

Transfer: it is to take the heated material out of the heating furnace and then send it into the thermoforming mold. The key point is to speed up. If the speed is too slow, it will affect the quality of stamping parts.

Stamping, quenching and follow-up treatment: stamping and forming of materials at a certain temperature, so as not to affect the forming performance of materials. When the material is formed, the mold should be closed and kept for a certain time, so that the material has good performance, and at the same time, it should be quenched. In the follow-up treatment, it is mainly some surface treatment, or drilling and other small processing.