Three-roller puncher

Abstract

The invention provides a three-roller puncher, and relates to the field of steel pipe manufacturing equipment. The three-roller puncher comprises a rack and three drum units arranged on the rack. The three drum units are arranged around a rolling axis and distributed by 120 degrees together with the rolling axis, each drum unit comprises a drum in a hollow cylinder shape and a feed angle adjusting device, and each drum can be rotatably arranged in the rack; the rotary axis of each drum is perpendicular to the rolling axis, a driving arm extending outward is arranged on the outer wall of corresponding drum, and the feed angle adjusting devices are arranged on the rack; each feed angle adjusting device comprises telescopic pushing rods and telescopic push-stopping rods, and the telescopic pushing rods and telescopic push-stopping rods are arranged in parallel to the rolling axis and abut against the two opposite sides of each driving arm; and the feed angle of each roller can be singly and accurately adjusted, and accuracy of center locating of each roller is guaranteed, and device abrasion is avoided.

Description

technical field [0001] The invention relates to the field of steel pipe manufacturing equipment, in particular to a three-roll piercer for piercing and rolling seamless steel pipes. Background technique [0002] Piercing is the most important forming process in the production of hot-rolled tubes. Its task is to perforate the solid billet into a hollow billet (capillary tube). The rolling mill that completes this task is called a piercing machine. In the skew rolling piercing process, the billet is driven by the rolls to rotate along the rolling axis. Since the rolls are arranged obliquely, the billet will move forward longitudinally during rolling (the rolling axis refers to the longitudinal axis of the billet), and at the same time reduce the outer diameter. and sections. During the longitudinal advance, the blank is forced to perforate by the perforating plug arranged between the rolls, after which the wall thickness of the perforated capillary can be further reduced whil...

AI Technical Summary

Problems solved by technology

[0005] The feeding angle adjustment structure of the above-mentioned three-roll piercer in the traditional sense is often easy to wear and tear, and a gap is easily generated after the wear, causing the rolls to swing from side to side during work; The adjustment of the advance angle, after a period of operation, will easily cause the wear of the large copper sleeve, thus making the center positioning of the roll inaccurate

The above two points will reduce the quality of piercing and rolling

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