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J. Manuf. Mater. Process. 2018, 2(2), 26; https://doi.org/10.3390/jmmp2020026

Application of Finite Element Method to Analyze the Influences of Process Parameters on the Cut Surface in Fine Blanking Processes by Using Clearance-Dependent Critical Fracture Criteria

1
Graduate School of Science and Engineering, Saga University, 1 Honjo, Saga 840-8502, Japan
2
Department of Mechanical Engineering, Saga University, 1 Honjo, Saga 840-8502, Japan
3
Industry Technology Center of Saga, 114 Yaemizo, Nabeshima-cho, Saga 849-0932, Japan
*
Author to whom correspondence should be addressed.
Received: 29 March 2018 / Revised: 17 April 2018 / Accepted: 19 April 2018 / Published: 23 April 2018
(This article belongs to the Special Issue Precision Manufacturing)
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Abstract

The correct choice of process parameters is important in predicting the cut surface and obtaining a fully-fine sheared surface in the fine blanking process. The researchers used the value of the critical fracture criterion obtained by long duration experiments to predict the conditions of cut surfaces in the fine blanking process. In this study, the clearance-dependent critical ductile fracture criteria obtained by the Cockcroft-Latham and Oyane criteria were used to reduce the time and cost of experiments to obtain the value of the critical fracture criterion. The Finite Element Method (FEM) was applied to fine blanking processes to study the influences of process parameters such as the initial compression, the punch and die corner radii and the shape and size of the V-ring indenter on the length of the sheared surface. The effects of stress triaxiality and punch diameters on the cut surface produced by the fine blanking process are also discussed. The verified process parameters and tool geometry for obtaining a fully-fine sheared SPCC surface are described. The results showed that the accurate and stable prediction of ductile fracture initiation can be achieved using the Oyane criterion. View Full-Text
Keywords: fracture criterion; sheared surface; finite element method; fine blanking fracture criterion; sheared surface; finite element method; fine blanking
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Wai Myint, P.; Hagihara, S.; Tanaka, T.; Taketomi, S.; Tadano, Y. Application of Finite Element Method to Analyze the Influences of Process Parameters on the Cut Surface in Fine Blanking Processes by Using Clearance-Dependent Critical Fracture Criteria. J. Manuf. Mater. Process. 2018, 2, 26.

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