Finite element simulation of chip geometry and formation in orthogonal metal cutting

• Main Authors: Shi-huan Fu, 傅士桓
• Other Authors: Ching-chih Tai
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/33u8nv

碩士 === 大同大學 === 機械工程學系(所) === 95 === In this research the finite element analysis software ANSYS/LS-DYNA is used to establish a set of simulation analysis model of a process of a set of metals orthogonal cutting. The physical quantity such as the stresses and the strains can be understood when the chip is formed; this is useful for the enhancing the dimensional accuracy and he improvement of the production. The “Johnson and Cook” formulation used in the analysis model is used to describe the behavior of the 0.18%mild steel material and the chip separate criterion is used to be the criterion of the element fracture if the undeformed chip separate from the workpiece to form the chip. The tendency of distribution of the cutting forces is very close to the experimental value from the reference, so the model established in this research is reasonable qualitatively. The results show that the largest effective plastic strain is caused in the surface of the tool-chip because of the friction. This shows that the caused deformation is in the primary deformation zone and the largest effective stress is caused in the primary deformation zone. The shear angle in the shear plane will crease with the cutting velocity. The results accord with the theory of cutting.