磨辊一般是采用双金属离心浇铸而成的。我们在试验生产过程中,发现磨辊外层是灰口层还是白口层与其表面气孔的多少大有关系。磨辊外层为灰口层时气孔较少,为白口层时则气孔增多,下面就以我们在生产实践中所得的经验来解释这一现象。1.铁水成分:在白口铁水的化学成分中,C、Si含量一般都较低,因而白口铁水的凝固速度比灰口铁水快,铁水镇静及气体析出的时间相应较短, Roller is generally bimetallic centrifugal casting. We test the production process, found that the outer layer of the roller is gray layer or white layer and its surface pores much. Grinding the outer layer of gray layer when the stomatal less stomatal hole when the white stomatal increase, the following to our experience in the production of practice to explain this phenomenon. 1. Hot metal composition: The chemical composition of hot metal in the white mouth, C, Si content is generally low, so the white iron hot metal faster than the gray iron water, hot metal and gas precipitation time is relatively short,