公开(公告)号：US5743124A

公开(公告)日：1998-04-28

申请号：US747703

申请日：1996-11-12

Applicant: Keiichi Sugiyama ,  Mitsuo Tsuge ,  Tadashi Hakamada ,  Masayoshi Ohhashi ,  Kunihiro Yasunaga

Inventor： Keiichi Sugiyama ,  Mitsuo Tsuge ,  Tadashi Hakamada ,  Masayoshi Ohhashi ,  Kunihiro Yasunaga

IPC: B21D7/00 ,  B21D7/025 ,  B21D7/14 ,  B21D5/06

CPC classification number: B21D7/14 ,  B21D7/025 ,  Y10S72/702

Abstract: A method of bending extruded shapes of the present invention controls a bending radius and a bending angle in accordance with a moving distance of a movable bending die. In the bending process, hardness of an extruded shape to be processed is measured and converted into proof stress, and the bending condition for compensating the springback is determined. A correction coefficient C showing a ratio of a practical value of the moving distance and a theoretical value of the moving distance in a case of no spring-back occurring is defined by a function of Young's modulus E, geometrical coefficient Z, bending radius R and proof stress .sigma..sub.0.2 for the extruded shape to be processed. The correction coefficient C is obtained by measuring the hardness of the extruded shape to be processed, converting the measured hardness into the proof stress, and substituting the proof stress and a predetermined bending radius R into the function, and the practical value of the moving distance of the movable bending die is determined.

Abstract translation: 本发明的弯曲挤压形状的方法根据可动弯曲模具的移动距离来控制弯曲半径和弯曲角度。 在弯曲过程中，测量待加工的挤出形状的硬度，并将其转化为证明应力，并且确定用于补偿回弹的弯曲条件。 表示在弹跳不发生的情况下移动距离的实际值与移动距离的理论值之比的校正系数C由杨氏模量E，几何系数Z，弯曲半径R和 挤出形状的加工抗力σσ0.2。 校正系数C是通过测定被加工的挤出形状的硬度，将测定的硬度转换为有效应力，将试验应力和规定的弯曲半径R代入功能而得到的，移动距离的实用值 确定可动弯曲模具。