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周期轧管变形区中,轧件宽度是否与轧辊孔型宽度(主要与孔型半径及开口角有关,见图1)相适应直接影响到轧出钢管的质量。如果孔型宽度(开口角)比实际轧件宽度小,变形金属就会挤入辊缝内形成“耳子”,有“耳子”的毛管翻转90°进行下一次轧制时,钢管外表面就会形成周期性分布的轧制外折;如果孔型宽度比轧件宽度大,则金属的延伸变形不佳,钢管横向壁厚不均程度就会加剧。以我厂216周期轧管车间为例,1972—1973年期间轧制φ168及φ180钢管时,由于原设计轧辊孔型宽度变化与轧件宽度不相适应,
Cycle rolling tube deformation zone, rolling width and roll hole width (mainly with the hole radius and the opening angle, see Figure 1) adapt directly affects the quality of the rolled steel pipe. If the hole width (opening angle) is smaller than the actual width of the rolling, deformation metal will be squeezed into the roll gap to form “ears”, the “ears” of the capillary turn 90 ° for the next rolling, the outer surface of the steel pipe Will form a periodic distribution of rolling out; If the hole width than rolling width, the poor deformation of the metal elongation, the extent of the steel pipe will increase the degree of lateral thickness. Taking the 216-cycle rolling mill in our factory as an example, when the φ168 and φ180 steel tubes were rolled during the period of 1972-1973, because the width of the original designed roll hole width is not compatible with the width of the rolled piece,