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Life and Flaw Detection Standards of Cold Rolling Rolls
时间：2023-06-14 11:46
来源： network
The main steps in the manufacturing process of cold rolling rolls include melting, forging, heat treatment, processing, and inspection. During the working process, cold rolling rolls must withstand significant rolling stress. In addition, problems such as weld seams, inclusions, and edge cracks in the rolled parts can easily lead to instantaneous high temperatures, causing strong thermal shock to the working rolls, causing cracks, sticking, peeling, and even scrapping. Therefore, cold rolling rolls should have the ability to resist cracking and peeling caused by bending stress, torsional stress, and shear stress, as well as high wear resistance, high contact fatigue strength, high fracture toughness, and thermal impact strength.
So how to improve the service life of rollers has always been a major issue faced by the roller manufacturing industry. The non-destructive testing of rolls is usually carried out using an ultrasonic flaw detector. In the inspection standards for cold rolling rolls, the roll body is usually divided into surface area, central area, and intermediate area based on the stress situation, and then the critical size of defects allowed to exist in each area is specified according to the principles of fracture mechanics. Flaw detection workers should have knowledge of roll manufacturing to facilitate the determination of defect properties, as well as knowledge of roll usage to estimate whether these defects may cause service damage under specific usage conditions.
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