비축대칭 와셔 캠 볼트의 다단 단조공정 설계를 위한 유한요소 해석
Finite Element Analysis for Multi-stage Forging Process Design of Bolt with Nonaxisymmetric Washer Cam
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Process design of multi-stage forging for a bolt with nonaxisymmetric washer cam has been studied by using finite element method. For shape complexity of the bolt, it is impossible to manufacture in a single stage forging. To design multi-stage forging for the bolt the forging load and fiber flow of each step have been analyzed by using commercial finite element code DEFORM-3D. Simulated results have been compared with experimental ones.Multi-stage forging process has been designed with four stages. The workpiece should be eccentric shape until third forging stage. And then bolt head and washer of eccentrical shape is created in last stage. As a results, It was predicted that shape of product would be good and effective strain would be uniformly distributed in the product. Also, it was predicted whether defects would exist or not by reviewing the fiber flow.
Abstract
Process design of multi-stage forging for a bolt with nonaxisymmetric washer cam has been studied by using finite element method. For shape complexity of the bolt, it is impossible to manufacture in a single stage forging. To design multi-stage forging for the bolt the forging load and fiber flow of each step have been analyzed by using commercial finite element code DEFORM-3D. Simulated results have been compared with experimental ones.Multi-stage forging process has been designed with four stages. The workpiece should be eccentric shape until third forging stage. And then bolt head and washer of eccentrical shape is created in last stage. As a results, It was predicted that shape of product would be good and effective strain would be uniformly distributed in the product. Also, it was predicted whether defects would exist or not by reviewing the fiber flow.
참고문헌 (6)
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- Forging Loads and Stresses in Closed-Die Forging: Part One, "T. Altan", Battelle Memorial Institute, ~, pp.Constract DAAG 46-68-c-0111,1968 (1968)
- J. C. Choi, "A Study of Automated Process Planning and Die Design for Multi Former-Bolt Products", Journal of the Korean Society of Precision Engineering, 20(4), pp.29~38 (2003)
- P. Petrov, "Prevention of lap formation in near net shape isothermal forging technology of part of irregular shape made of aluminium alloy A92618", Journal of Materials Processing Technology, 177(1), pp.218~223 (2006)
- T. Altan, "Use of Standardize Copper Cylinders for Determining Load and Energy in Forging Equipment", Trans. of ASME Journal of Eng. for Ind, pp.769~774 (1972)
- J.Monaghan, "A Finite Element Analysis of Cold-Forging dies using two and three dimensional models", Journal of Materials Processing Technology, 118(1), pp.286~292 (2001)