Under certain friction conditions, the wear process can be divided into three stages: running in, stable wear and severe wear. A kind of<br>Running in is an unstable stage of wear. It has a small starting rate and high wear rate in the whole working time. But it decreases with working hours.<br>The time of stable wear stage is the longest. It is characterized by slow wear and stable wear rate.<br>In the severe wear stage, the wear rate increases sharply. For the roller of plate bending machine, it means that the stress concentration is serious, which leads to the roller fracture easily.<br>Running in period of trial operation<br>For the plate bending machine, the idling running in of the machine is of great significance to the efficiency and service life of the machine.<br>Running in can form elastic contact conditions on the machine surface. Thus, it can provide a minimum friction rate and a stable friction value.<br>The important rule of running in is stable roughness.<br>This is independent of the original roughness, but depends on the wear conditions.<br>This is not a kind of medium and long-term running in of the machine.<br>The running in results of rolling machine and plate are affected by material, load, speed, mechanical and physical properties.<br>However, as long as the pressure does not exceed the critical value, it is better to keep elastic contact.
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