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What are the reasons for corrosion of automotive hardware stamping parts?
2021-03-23 09:26:30

In addition to the reasonable die structure, high manufacturing accuracy, good heat treatment effect and the correct selection of punch, the installation accuracy of the drawing stamping parts, the correct use, maintenance and maintenance of the die are also important links! At the same time, we should pay attention to the following points:

1. Before the installation and use of the drawing stamping parts, it should be strictly checked to remove the dirt, and check whether the guide sleeve and the die of the drawing stamping parts are well lubricated!

2. When the punch and die edge of the drawing stamping parts are worn, they should be stopped and the cutting edge is worn in time. Otherwise, the wear degree of the die edge will be expanded rapidly, the die wear will be accelerated, and the stamping quality and die life will be reduced!

3. Ensure the service life of stamping parts, and should replace the spring of the die regularly. The automobile sheet metal parts prevent the spring fatigue damage from affecting the use of the stretch stamping parts!

The drawing stamping parts are the forming and processing methods of the required shape and size workpiece by applying external force to the sheet and strip, pipe and profile by pressing die to produce plastic deformation or separation! Stamping and forging are plastic processing, which are called stamping materials. Mainly hot rolled follow steel plate and steel strip!


Automobile stamping parts manufacturers

In order to produce normally, improve the quality of metal stamping parts, reduce cost and prolong the life of stamping die, it is necessary to use and maintain the die correctly! Strictly implement the "three inspection" system of die, and do well in the maintenance and maintenance of die!

In our ordinary times, we always see the metal car stamping parts corrosion phenomenon, so what causes it to appear corrosion phenomenon?

The internal factors of metal corrosion are: from the thermodynamic point of view, compared with its corrosion products, metals have higher energy, are unstable, and have the tendency of spontaneous conversion to low energy corrosion products. That is to say, metal corrosion is a natural phenomenon. Most of the metals in industry are multi-component alloys. The alloy has different phase structure, impurities and mechanical processing changes Uneven shape, uneven stress distribution, etc! These are physical, chemical and electrochemical inhomogeneity, when the surface of water film, inevitably will occur chemical or electrochemical corrosion!

External factors of metal corrosion:

1. The higher the relative humidity in the air, the thicker the water film on the metal surface, the effect of oxygen in the air on the metal surface through the water film. When the relative humidity reaches a certain value, the corrosion rate increases greatly. This value is called the critical relative humidity! The critical relative humidity of steel is about 70%!

2. The influence of temperature is related to relative humidity. In dry environment, the metal with higher temperature is not easy to rust. When the relative humidity reaches the critical value, the influence of temperature is obviously intensified, and the corrosion rate will be doubled every 10 ℃ increase. Therefore, in humid hot tropical or rainy season, the higher the temperature, the more serious the corrosion is! Therefore, no water and oxygen metal will not rust, 20% of the air volume is oxygen, he said that no hole!

3. Influence of other materials in the atmosphere: when the atmosphere contains salt fog, sulfur dioxide, hydrogen sulfide and dust, corrosion will accelerate. Therefore, the difference of corrosion under different environments is obvious. Cities are higher than rural areas, industrial areas are higher than living areas, coastal areas are higher than inland, high dust is higher than low dust!


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