Effects of Material Properties and Punch Tip Radius on Spring-Forward in 90° V Bending Processes

作     者：Dilipak Hakan zdemir Mustafa Sarikaya Murat 

作者机构：Manufacturing DepartmentTechnology FacultyGazi University Mechanical EducationInstitute of Science and TechnologyGazi University Machine and Metal Technology DepartmentVocational High SchoolSinop University 

出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期：2013年第20卷第10期

页      面：64-69页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

主　　题：spring-forward V die bending metal forming heat treatment 

摘      要：Bending process is one of the most significant fields of application of sheet metal die. Sheet metals are ex posed to some spring back or spring-forward depending on elastic deformation following bending process. S235JR （1. 003 8） materials having a thickness of 4 mm were bent with 90° punches having 5 different tip radiuses. The ben- ding process was carried out by making the punch waited on the material for 30 s （30 s wait bending） and by remo ving the punch without waiting （direct bending）. Specimens were prepared in three forms as non-heat-treated, nor- malized and tempered. At the same time, all experiments were performed at a deformation speed of 25 mm/min. As a result, it was determined that as punch tip radius increased, the amount of spring-forward decreased. Although normalizing process applied to specimens increased the amount of spring-forward, tempering process decreased it. The amount of spring-forward was decreased in 30 s wait bending process.