Analysis on the cause of brake drum failure

Longyao xiangyuan co., LTD., established in January 2010, covers an area of 20,000 square meters and is located at no. 12, A3 zone, gucheng industrial park, longyao county, xingtai city, hebei province. The main products of the company are: brake drum, wheel hub, brake disc, brake shoe and so on domestic, import automobile, semi-trailer, full trailer chassis accessories, the variety is complete, the quality is stable and reliable. The company not only establishes long-term and stable supporting cooperation with sinotruk, fuhua and other large vehicle manufacturers, but also exports its products to the Middle East, America, Europe, Africa and southeast Asia and is deeply trusted by customers.

The failure reason of brake drum is analyzed below

1. Reasons for cracking failure

Automobile brake drum will be affected by various forces in the conventional operation process, mainly including the normal pressure and rotation of the hoof and the tangential force of the clutch piece of the hoof. The two forces complement each other. If the normal pressure does not exist, the tangential force will disappear. But in the normal operation process, the friction between the two will generate heat, the temperature of the brake drum will continue to rise, and the friction between the two is a spot-like contact friction, so the friction generated heat on the contact surface will also lead to the tissue phase transition phenomenon, resulting in phase transition stress. This phase change stress will lead to uneven force on the brake drum, which will lead to regular cracks in the brake drum under frequent brake loads.

2. Cause analysis of cracking failure

Brake drum cracking also covers two additional causes. First of all, the brake drum will be affected by the difference in material strength, resulting in the cracking problem. Second, after the cracking problem of the brake drum occurs, the brake drum will produce a local phase transition under the interaction of thermal stress and phase transition stress, leading to the reduction of strength. At this point, the crack on the brake surface will continue to extend and expand, leading to the cracking phenomenon.

3. Failure reason analysis of bottom drop

In the car brake drum does not appear under the premise of cracking and appear direct cracking, this is the failure of the bottom, it will lead to the direct failure of the brake drum. Specifically, it also includes two points: first, the strength of the brake drum material is not good, followed by some unreasonable abnormal external forces, brake drum will also be affected by the torsion of the flange layer of the impact of indirect cracking phenomenon, at this point, the flange layer of the brake drum crack phenomenon, and finally cause the bottom problem.

4. Analysis of excessive wear and non-wear failure

Excessive wear and wear are easy to lead to the complete failure of the car brake drum, first of all, it refers to the car brake drum operating belt in the channel braking force under the influence of the brake drum operating geometry of the inner neck of the larger and larger, wall thickness is thinner and thinner, directly on the brake drum braking effect has a negative impact. Look at the abnormal wear failure, when the brake drum working face in the shoe iron and other hard external force, due to friction contact will appear groove, partly due to the lack of hardness caused by the car brake drum!

In a word, the automobile brake drum crack failure reasons are various, it is generally by the brake belt working face as a start and produced, with the increasing strength of the brake, the brake surface will appear cracks, resulting in the failure of the automobile brake drum.