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在明斯克齿轮厂,1.5～4千吨机械锻压机的大部分锻模都是以柱形冲杆配上热压模芯的形式在运行。已经进行的种种研究和生产试验都表明,采用经过氮化处理的耐热复合合金钢去制造模芯比较合适,特别是用经过三段氮化工艺氮化处理的4钢(HRC45～50)代替5XHM钢(硬度调质到HRC40～45)去制造模芯,能保证提高模芯的使用效率1～1.5倍。三个氮化阶段指的是:第1阶段—540℃,保温8小时,氨
In Minsk Gear Factory, most of the forging dies for 1.5 ~ 4 kt mechanical forging press are operated in the form of column punch with hot stamping core. All the research and production tests that have been conducted have shown that it is more appropriate to use a nitrided heat-resistant composite alloy steel to manufacture a mandrel, in particular by replacing the steel with a nitrided steel grade 4 (HRC 45-50) after three nitriding processes 5XHM steel (hardness quenched to HRC40 ~ 45) to create the core, to ensure the use of mold core to improve the efficiency of 1 to 1.5 times. Three nitride stage refers to: the first stage -540 ℃, heat 8 hours, ammonia