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31.什么叫皮尔格轧管机? 1892年前该轧管机由曼内斯曼首创。这是一台二辊式轧机,每个轧辊上开有一个变截面的半圆孔槽,孔槽的半径逐渐减小,孔槽的最大半径稍大于来料荒管半径,而最小半径等于轧成钢管半径。两个轧辊配成一个圆形孔型,以相同的速度相反方向旋转。穿好孔的荒管先套在锥形芯棒上,用喂料装置夹住。轧辊转至孔楷最大位置时喂料装置按一定的送进量将荒管推进,同时将其旋转90°。随着轧辊的转动,孔型直径逐渐
31. What is Pilger? The tube rolling machine was first pioneered by Mannesmann before 1892. This is a two-roll mill, each roll has a semi-circular hole with a variable cross-section slot, the radius of the hole groove gradually decreases, the maximum radius of the slot slightly larger than the radius of incoming waste tube, and the minimum radius equal to rolling into Pipe radius. The two rollers fit into a circular hole and rotate in the opposite direction at the same speed. Prevented pipes were first placed over a conical mandrel and clamped with a feeding device. Roll Kai Kong largest position when the feeding device by a certain amount of advance to promote waste pipe, while its rotation 90 °. With the roll rotation, the hole diameter gradually