PURPOSE: To obtain a produce pipe whose uneven thickness and roundness are both within an allowable range, and also to expand a kind of a manufactured item of a thick or high strength tube, etc., by bending in advance both edge parts of a loop to a necessary shape by a press equipment which is provided on the front stage of a forming roll stand group, and thereafter, feeding it to said stand group.
CONSTITUTION: When a hoop 2 from an uncoiler 8 is made to pass through a leveler 3 and fed to a press equipment 1 at a correct feed speed, a self-running truck 14 of the equipment 1 is started, and when a speed of the truck 14 synchronizes with the feed speed of the hoop 2, upper and lower metallic dies 12, 13 of a hydraulic press 11 are closed and the hoop is pressed. In this case, the equipment 1 moves in the feed direction of the band steel 2 in a state that the hoop 2 is pressed by the metallic dies 12, 13, bends in advance both edge pats of the hoop 2 continuously extending over the overall length, feeds it continuously to a forming roll 4W7 stand group and forms it in a tubular shape. According to such a method, generation of a defective decreases, and the yield of a product can also be improved.
FURUKATA MUNEKATSU
SUGIMORI YOSHIAKI
SATO KENJI
HAMADA SHIGEYUKI
Next Patent: SHEET METAL FORMING MACHINE AND SHEET METAL FORMING METHOD