| 摘要 |
PROBLEM TO BE SOLVED: To manufacture an H-shaped steel without rough surface through a rolling process to roll an intermediate rough shape material into an intermediate shape material with two rolls and then through a forming process to form the intermediate shape material into an H shape instead to using an expensive universal rolling line. SOLUTION: The grooves of rolling rolls to roll an intermediate rough shape material in a rolling process are such that the web portions of the intermediate rough shape material are inclined against the shaft centers of the rolling rolls, and a flange portion 63 at one side of one end and a flange portion 65 at one side of the other end have a right angle against the shaft center of the rolling rolls. It is effective for the intermediate rough shape material that its web portions have the angle 20 to 45 deg. against the shaft center of the rolling rolls. For example, whileθ(angle of flange portions 62, 63, 64, and 65 of the intermediate shape material) =ψ=γ= 30 deg. is satisfied the height of the web portion and the width of the flange portion of the H shape are made to be equal. |
