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在管坯穿孔过程中,导板的工作表面经受着温度1200℃左右和单位压力50～80MPa 以及管坯-荒管旋转前进的巨大摩擦力等交互作用。在穿孔的间隔时间,导板表面还要受冷却水的急速冷却。因此,往往在穿完一支管以后,导板表面就开始产生裂纹,在继续穿孔过程中,导板很快被磨损以致报废。为了提高穿孔机导板的使用寿命,苏联南
In the process of perforating the pipe, the working surface of the guide plate is subjected to the interaction of a temperature of about 1200 ° C and unit pressure of 50-80 MPa and a huge frictional force of the pipe-spar pipe rotating forward. At the perforation intervals, the guide surface is also subject to rapid cooling of the cooling water. Therefore, often after the completion of a tube, the surface of the guide plate began to crack, continue to perforation process, the guide plate quickly worn out so scrapped. In order to improve the service life of the punch guide plate, the Soviet Union South