Release time£º2020-05-10 Pageviews£º
There are many kinds of reasons that cause the breaker to fail. The common ones are the following. One is the equipment itself, including two types. One is that the quality of the mechanical equipment in the early stage is not good, and the material strength of the production and manufacturing equipment is insufficient or It is the poor fatigue resistance, which makes the parts of the breaker rapidly age and wear under normal use conditions, causing equipment failure; the other type is due to internal or external reasons, or as the use time extends, the equipment parts are worn out , Wear, deformation, fatigue, etc., these unfavorable factors gradually accumulate, and when they reach a certain level, equipment failures will occur. Second, equipment failures caused by external causes, such as improper operation, inadequate daily maintenance failures, poor equipment use environments, and equipment work Run program error, etc.
Breaker manufacturers pay attention to the fatigue resistance of materials to make adequate preparations for reducing the frequency of failures. Since the maximum stress of fatigue cracks of mechanical parts is mostly generated on the surface of the material, the surface quality of the material itself has an impact on the fatigue strength Significantly.
¡¡¡¡ At present, most mechanical parts are spring materials, and cracks will appear during continuous rolling, drawing and coiling. In addition, the original scars and spots on the surface of mechanical parts are also potential factors that aggravate spring fatigue fracture in the future.????????
¡¡¡¡?The smoothness and roughness of the material surface is an important indicator of fatigue strength. The rougher, the smaller the stress concentration, the higher the fatigue strength caused by this. The roughness of the material acts through the fatigue limit. Regardless of other factors, the roughness of mechanical parts is high, and the fatigue limit is low. Therefore, pressing, rolling, grinding and shot blasting the surface of mechanical materials can effectively enhance the smoothness of the material surface and increase the fatigue strength coefficient of the material. There are two commonly used methods, surface heat treatment and surface mechanical strengthening.
