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프로그레시브 전단 공정에서 박판 핀 비틀림 최소화를 위한스프링 배치 최적화

Title
프로그레시브 전단 공정에서 박판 핀 비틀림 최소화를 위한스프링 배치 최적화
Other Titles
Optimization of Spring Layout for Minimizing Twist of Sheet Metal Pins in Progressive Shearing
Author
금영탁
Keywords
Spring Layout; Blanking Dies; Blank Holding Force; Metamodel; Optimization; Evolutionary Algorithm
Issue Date
2014-12
Publisher
한국소성가공학회
Citation
소성가공, 2014, 23(8), P.501-506
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.
URI
http://koreascience.or.kr/article/ArticleFullRecord.jsp?cn=SSGGB@_2014_v23n8_501
ISSN
1225-696X
DOI
10.5228/KSTP.2014.23.8.501
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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