Method for evaluating propriety of molding sheared edge

• Main Authors: HIGAI KAZUHIKO, YAMASAKI YUJI, IIZUKA EIJI
• Format: Patent
• Language: Chinese; English
• Published: 02.01.2018
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PHYSICS; PUNCHING METAL; TESTING; TRANSPORTING; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

The purpose of the present invention is to provide a technique for more precisely evaluating the propriety of forming a sheared material edge after preforming. Through a hole enlargement test on a metal plate after preforming, a strain gradient at a sheared edge is changed and a plurality of data of the deformation limit equivalent strain amount with respect to the strain gradient are calculated,and a relationship of a stretch flange deformation limit equivalent strain to the strain gradient is calculated from the plurality of data and the amount of pre-deformation equivalent strain. The propriety of forming a sheared edge for a metal plate subjected to pre-deformation by preforming is evaluated from a forming limit line L or formable region R of the sheared edge from the calculated relationship. 本发明的目的在于提供以更高的精度对在预成型后进行剪切的材料边缘能否成型进行评价的技术。通过对预成型后的金属板的扩孔试验，改变剪切边缘处的应变梯度来求出变形极限等效应变量相对于应变梯度的多个数据，由该多个数据和预变形等效应变量求出拉伸凸缘变形极限等效应变相对于应变梯度的关系。根据求得的关系，由上述剪切边缘的成型极限线L和可成型区域R对通过预成型而被施加了预变形的金属板评价剪切边缘能否成型。