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在运用已知的 XIIT 轧机工具孔型设计的各种方法设计孔型时,对按钢管内径ΔP 选择自由减径值通常没有规定,因此,给轧制低塑性材料和内表面质量要求较高的管子带来很大困难。同时,有的资料提到,自由减径的允许极限值可用系数间接确定:ηp=tp/t3 (1)式中:tp 和 t3——在自由减径最终和开始区由于自由减径造成管壁增厚的壁厚。在 XIIT 轧机现有的轧制表中,自由减径值在大多数情况下都超过临界值,ηp≥1.18。临界值以钢管内表面出现细
In the design of the hole pattern using various methods known in the tool hole design of the XIIT rolling mill, the choice of the free-cut value for the inner diameter of the pipe, ΔP, is usually not specified. Therefore, the requirements for rolling low-plasticity materials and the quality of the inner surface are high Pipe is very difficult. At the same time, some data mentioned that the allowable limit value of free-reduction can be indirectly determined by the coefficient: ηp = tp / t3 (1) Where: tp and t3 - the free-reducing at the end of the free- Wall thickened wall thickness. In the existing rolling schedule of the XIIT mill, the free-fall value in most cases exceeds the critical value, ηp ≧ 1.18. The critical value appears on the inner surface of the steel tube