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http://dx.doi.org/10.5228/KSTP.2014.23.8.501

Optimization of Spring Layout for Minimizing Twist of Sheet Metal Pins in Progressive Shearing  

Song, H.K. (Hanyang University)
Shim, J.K. (Hanyang University)
Keum, Y.T. (Hanyang University)
Publication Information
Transactions of Materials Processing / v.23, no.8, 2014 , pp. 501-506 More about this Journal
Abstract
Progressive shearing with blanking dies is commonly employed to produce large quantities of tiny sheet metal electronic parts. Sheet metal pins, which are narrow and long, that are sheared with a progressive die set are often twisted. The twist in the sheet metal pins, which usually occurs in the final shearing operation, generally decreases with increasing blank holding force. The blank holding forces in all shearing operations are not the same because of different shearing positions and areas. In the current study, the optimal layout of the springs in a progressive die set to minimize the twist of the sheet metal pin is proposed. In order to find the holding force acting on the tiny narrow blanks produced with the proposed springs during the shearing process, the equivalent area method is used in the structural analysis. The shearing of the sheet-metal pin was simulated to compute the twist angle associated with the blank holding force. The constraint condition satisfying the pre-set blank holding force from the previous shearing operations was imposed. A design of experiments (DOE) was numerically implemented by analyzing the progressive die structure and by simulating the shearing process. From the meta-model created from the experimental results and by using a quadratic response surface method (PQRSM), the optimal layout of the springs was determined. The twist of sheet metal pin associated with the optimal layout of the springs found in the current study was compared with that of an existing progressive die to obtain a minimal amount of twist.
Keywords
Spring Layout; Blanking Dies; Blank Holding Force; Metamodel; Optimization; Evolutionary Algorithm;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 R. Hambli, M. Rexzka, 2002, Fracture Criteria Identification using an Inverse Technique Method and Blanking Experiment, Int J. Mech. Sci., Vol. 44, No. 7, pp. 1349-1361.   DOI   ScienceOn
2 D. C. Ko, C. Kim, B. M. Kim, J. C. Choi, 1996, Simulation of Sheet Metal Blanking Process for using Mesh Elimination, J. Kor. Soc. Precis. Eng., Vol. 13, pp. 114-123.
3 J. H. Yoon, H. Huh, S. S. Kim, G. H. Na, H. J. Park, T. H. Choi, 2004, Multi-Stage Forming Analysis of a Milli-Component for Improvement of Forming Accuracy, Trans. Mater. Process., Vol. 13, No. 5, pp. 430-434.   과학기술학회마을   DOI   ScienceOn
4 K. H. Choi, 2007, Study on The Strip Layout Design of LCD Shield Case Using 3D CAD/CAM, J. Kor. Acad.-Ind. Cooperation Soc., Vol. 8, No. 5, pp. 979-983.   과학기술학회마을
5 M. G. Cockcroft, D. J. Latham 1968, Ductility and the Workability of Metals, J. Inst. Metals, Vol. 96, pp. 33-39.
6 PIDOTECH Inc., PIAnO user's manual version3.3.
7 D. G. Krige, 1951, A Statistical Approach to Some Basic Mine Valuation Problems of the Witwatersrand, J. Chem. Metall. Min. Soc. Af., Vol. 52, pp. 119-139.
8 K. J. Hong, D. H. Choi, M. S. Kim, 2000, Progressive Quadratic Approximation Method for Effective Constructing the Second-order Response Surface Models in the Large Scaled System Design, Trans. Kor. Soc. Mech. Eng. A, Vol. 24, No. 12, pp. 3040-3052.   과학기술학회마을