Car brake drum is an important functional component of car, and it is also the main component to measure the performance of car. It is also the first part to be checked in the daily maintenance. Related materials appear. The following will mainly discuss the main reason of the first two cracking modes -- thermal fatigue cracking caused by the attack of high temperature and cold.

Brake drum sampling plan and inspection basis

I. Sampling plan of brake drum

The brake drum in the sample of the product is origin of scrap product replacement for car repair shop, from shijiazhuang, the city of chaff, and positive definite three areas of six repair shop to buy 30 samples, the choice of the garage are relatively large, the vehicles involved many varieties, the product model is more, and the service goal of a garage also all over the country, Therefore, the samples purchased this time are representative to a certain extent, as shown in Figure 1.

The damage location and damage degree of the samples taken are different, and then the analyzer can better grasp the quality hazard point of the sample.

Sample from appearance, most of the sample bearing damage is friction surface crack, and the causes of cracks in the onset of brake drum is, cars went down the mountain, high temperature, long brake drum will attack if wade, immediately after the downhill brake drum with water and a sharp contraction, so the friction brake drum surface crack along the axis direction of attack, the crack extension with continuous brake, brake drum rupture. Some brake drums in the warranty found that the friction surface of a piece of sparkle stains, this is the brake drum at high temperature and water and constitute.