Issue 30

C.J.Su et alii, Frattura ed Integrità Strutturale, 30 (2014) 502-514; DOI: 10.3221/IGF-ESIS.30.61 502 Research on parameters optimization of bilateral ring gear blank-holder in thick-plate fine blanking C.J.Su, X.H.Dong, S.M.Guo, Q.L.Li, T.T.Li College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China suchunjian2008@163.com ABSTRACT. To compensate for the poor quality of thick-plate blanking parts in cross-section, this paper suggests using the optimizing bilateral ring gear holder parameters to increase burnish zone and improve cutting precision. With the bilateral gear ring, the hydrostatic pressure of shear deformation zone will increase, plasticity of the material will be lifted to maximum and quality of the cross section will be raised. This paper establishes 8mm AISI-1020 fine blanking model by DEFORM2D, analysis different ring gear parameters and clearance that are influenced the stress-strain and cross section quality to predict forming defects. By using the bilateral gear ring blank holder, the poor quality of thick-plate blanking section is successfully enhanced. Therefore, the bilateral gear ring blank holder is vital to improve the quality of blanking parts and provide the reliable theory basis for the practical engineering application. KEYWORDS. Thick-plate; Fine blanking; Bilateral gear ring blank holder; Cross section quality. I NTRODUCTION ine blanking technology has advantages of high efficiency, low energy-expending and low consumption, so it has been widely used in modern industry in recent years. [1, 2] With the wide application in nearly every field, the research on the process has gradually been a hot topic. T.S.Kwak et al. [3] analyzed the influence rules of width and height of euphotic belt by using the element-delete method in the process of fine blanking, and concluded that the euphotic belt increases as the tooth height grows, while reduces as the tooth pitch grows. Z.H.Chen [4] and Ridba Hambli [5] found tine blanking can achieve maximum brightness by inhibiting the generation of crack, and the distribution rule of stress and strain is given by a detailed analysis on blanking process. Peng Qun et al. [6] simulated the fine blanking process by using strength blank-holder technology. The material flowing law and strain and stress distribution have been studied, which provide the theoretical basis for fine blanking technology. Under the conditions of negative clearance, W.F.Fan et al. [7] simulated the fine blanking process of AISI- 1045 and AISI-1025 with finite element method using Cockcroft and Latham criteria. The results showed that the negative clearance blanking could guarantee higher cross section quality than common blanking. At present, fine blanking technology adopting thick plate is imperfect compared with that using the thin plate. Therefore, to boost production, here higher-quality thick fine blanking pieces is needed. So it is necessary to carry out more researches. The ring gear gag creates optimal conditions for thick plate fine blanking technology that will not only be applied on diversiform material and different thickness of the plank but also be formed into a work piece with high quality. So it has great pragmatic value thus attracts many scholars to research on blank holder with gear ring. F