论文部分内容阅读
高速钢具有硬度高、红硬性好等特点 ,适合于制作轧辊、导辊等高温下工作的部件。高速钢轧辊通常采用离心铸造方法生产 ,由于高速钢中合金元素密度差大 ,轧辊偏析严重 ,高速钢优异的耐磨性发挥不出来。为了克服离心铸造方法的缺点 ,开发了挤压铸造高速钢轧辊技术 ,研究了挤压铸造工艺对高速钢性能的影响。压力、保压时间和压下速度是影响高速钢轧辊缩孔的重要因素。采用浇注温度 1 4 0 0～ 1 4 5 0℃、压力1 5 0 MPa、保压时间 1 2 0～ 1 5 0 s,压下速度 1 4～ 1 6 mm/ s,可获得组织致密、无偏析、加工量少的高速钢轧辊。应用于高速线材轧机预精轧机架 ,使用寿命比高镍铬无限冷硬铸铁轧辊提高 5～ 8倍。
High-speed steel with high hardness, good hardness and other characteristics, suitable for the production of rolls, guide rollers and other high temperature work components. High-speed steel rolls are usually produced by centrifugal casting. Due to the large density of alloying elements in high-speed steel and severe roll segregation, excellent wear resistance of high-speed steel can not be realized. In order to overcome the shortcomings of centrifugal casting method, squeeze casting high-speed steel roll technology was developed to study the squeeze casting process on the performance of high-speed steel. Pressure, dwell time and the reduction speed are important factors affecting the shrinkage of high speed steel rolls. Using pouring temperature of 1400 ~ 11500 ℃, pressure of 150 MPa, dwell time of 120 ~ 150 s, reduction speed of 14 ~ 16 mm / s, we can obtain the dense structure without Segregation, less processing speed of high-speed steel roll. Used in high-speed wire rod mill pre-finishing stand, the service life than the high-nickel-chromium unlimited chilled cast iron roll increased by 5 to 8 times.