METHOD FOR DRAWING STEEL SHAPES

Japanese Patent JP3803167

B2

PROBLEM TO BE SOLVED: To smoothly operate loading and unloading an inside die between flanges of a steel shapes, and to improve the workability and the productivity without requiring a special mechanism for any drawing shape. SOLUTION: This is a drawing method of a steel shapes to reduce the distance between flanges F, F by using a die 2 on the steel shapes A having the flanges F, F with the inside faces opposed to each other at an interval, the die 2 is provided with inside dies 3 inserted between the flanges F, F and fitted for the inside face shape of the flanges F, F after being drawn, and this inside dies 3 are formed freely expandable and contractable in the drawing direction, and when the width is expanded, drawing is executed and when the width is contracted, the steel shapes A are made movable.