Secondly there is error between the thread roll angles of thread rolling die and drill rod.
滚丝轮螺纹和钻杆螺纹的螺旋角有误差。
Thread material web from unwind to first guide roll and to first spreader unit.
引纸纸幅从放卷到第一导辊在到第一舒展单元。
Thread material web from unwind to first guide roll and to first spreader unit.
引纸纸幅从放卷到第一导辊在到第一舒展单元。
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