| 摘要 |
PROBLEM TO BE SOLVED: To insert smoothly a front end portion of a formed material into a cutting die of a moving cutter, in an initial rolling and cutting work, when a formed product with a cross sectional shape having a blind portion is produced by a roll forming machine.SOLUTION: The roll forming method includes feeding a material consisting of a metal strip in a roll forming machine continuously, performing bending processing sequentially to form it into the cross sectional shape having the blind portion, and inserting it into a cutting die 7 of the moving cutter and cutting it to obtain a formed product 11 of a predetermined length with the cross sectional shape having the blind portion, wherein in the forming process, a portion 11a located in the front end portion of the material and formed into the blind portion is previously cut obliquely in the stage of a flat plate, then the front end portion of the material is fed in the roll forming machine. Thereby, the cross sectional shape of the front end portion of the formed material becomes the cross sectional shape without the blind portion 11a which is hard to enter the insertion opening 25a of the cutting die, so that the front end portion of the formed material can enter the insertion opening of the cutting die easily. |
