Tool for forming of square and rectangular pipes

摘要

A tool for forming of square and rectangular pipes contains four rollers installed on mutually perpendicular axles, rollers form a closed pass by their concave working surfaces. The working surfaces of rollers are made on the sinusoid, which amplitude makes 0.01-0.015 of the width of the face of finished pipe. In this case the length of the section of sinusoid corresponds to the range of angle from 0° to 180°.