Brake pads ”brittle” essentially, the problem belongs to the same problem as “insufficient impact strength”. In the braking process of heavy trucks, the impact force is very large. If the impact strength of the brake liner can not reach the required target, it is very simple to break. In addition, if the inner arc radius of the brake liner is not quite consistent with the outer arc radius of the brake shoe, the brake liner will break, perhaps the inner arc radius of the liner is greater than the outer arc radius of the brake liner. The shoe, which forms the phenomenon of warping at both ends, is easily broken.
Second, the “loose appearance” of the brake pad the outer porosity means that from the appearance of the product, the density of the data is not the same, and some parts appear loose. If a physical test is carried out, it will be found that the hardness of the exterior is different from that of the other parts. The reason is that there are bubbles or uneven material mixing in the hot pressing process. Products with external defects are classified as nonconforming products and cannot be delivered. In operation, it will affect the braking interval and cause noise.
There are many reasons why the brake pads announce abnormal sound when braking. One of them is that if the natural frequencies of the brake shoe, brake pump and brake accessories components in the braking process reach a common point, noise will occur. In addition, if the original brake pads have no noise, and the brake pads purchased on the market will attack noise, it can be confirmed that this is the improper use of product formulation.
If the “surface particles” of the brake skin are not the large particle conflict data used in the special formula, the particles will appear on the surface of the product, and the distribution is uneven, and it can be confirmed that the product is caused by uneven mixing or foreign bodies in the production process. Substances attributed to the hot pressing process are attributed to nonconforming products.
When riveting heavy truck drum brake pads, if it is difficult to insert the rivet after inserting the first few holes, it may only be possible to insert the rivet with a large external force or hit, which indicates that the bearing of the brake pad is incorrect, and after strong riveting, the stress concentration will appear on the hole data. Because of the poor patience of the data, rivet will be made in this position after several brake embrittlement.
6. “Irregular hole diameter” of brake liner block When riveting heavy truck drum brake liner block, if the aperture of brake liner block is irregular, it indicates that there is a quality problem of brake liner block. Because the irregular hole diameter will lead to uneven cooperation between the inner diameter of the back hole of the riveted brake liner and the outer diameter of the rivet, the contact area between the rivet head and the conflict data part is uneven, and it will occur after several brake breaks.
The above is the car brake pad manufacturers share in the use of brake pads need to pay attention to these problems, we master it?
Post time: Nov-04-2024