Investigation of the shear-zone length in fine hydromechanical blanking

A new process called fine hydromechanical blanking is proposed in this paper. In contrast to conventional fine blanking, in fine hydromechanical blanking, the V-ring indenter on the guide plate is replaced by a V-ring cavity formed in a workpiece and pressurized by hydraulic pressure. In addition, the counterforce from the blanking ejector is replaced by the hydraulic pressure acting on the ejector chamber. An experimental algorithm for optimization based on the Taguchi method, in which a genetic algorithm is used for searching, is proposed to determine the largest shear-zone length. From the experimental results, it is concluded that the proposed method can achieve the same effects as conventional fine blanking. In addition, an investigation of the effect of the hydraulic pressure in the V-ring cavity and ejector chamber on the shear-zone length was conducted through a series of experiments. The results show that the experiments were greatly affected by the height of the burnished surface and indicate the significance of the hydraulic pressure in the V-ring cavity and ejector chamber.

[1]  R. Padmanabhan,et al.  Influence of process parameters on the deep drawing of stainless steel , 2007 .

[2]  Tai Chiu Lee,et al.  Straining behaviour in blanking process - fine blanking vs conventional blanking , 1995 .

[3]  Sutasn Thipprakmas,et al.  Application of Taguchi technique to investigation of geometry and position of V-ring indenter in fine-blanking process , 2010 .

[4]  W. B. Bae,et al.  The effect of V-ring indenter on the sheared surface in the fine-blanking process of pawl , 2003 .

[5]  J. Marchand,et al.  Development of a numerical code based on the slip-line field method: Application to the fine-blanking process , 1992 .

[6]  Luen Chow Chan,et al.  Application of the finite-element deformation method in the fine blanking process , 1997 .

[7]  Simon Richir,et al.  Prediction of optimum clearance in sheet metal blanking processes , 2003 .

[8]  D. M. Tracey,et al.  On the ductile enlargement of voids in triaxial stress fields , 1969 .

[9]  Ridha Hambli,et al.  Fracture criteria identification using an inverse technique method and blanking experiment , 2002 .

[10]  Chang-Soo Han,et al.  Development of a new burr-free hydro-mechanical punching , 2005 .

[11]  U. P. Singh,et al.  Further observations and review of numerical simulations of sheet metal punching , 2006 .

[12]  Henry W. Altland,et al.  Engineering Methods for Robust Product Design , 1996 .

[13]  Ridha Hambli,et al.  Finite element simulation of fine blanking processes using a pressure-dependent damage model , 2001 .

[14]  Nobuo Hatanaka,et al.  Finite element simulation of the shearing mechanism in the blanking of sheet metal , 2003 .