Optimization design of the handle for ratcheting box open end wrench

• Main Authors: Syu,Cih-Hong, 許慈宏
• Other Authors: Chang,Chia-Lung
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/99134315407710197922

碩士 === 國立雲林科技大學 === 機械工程系 === 104 === In this study, the stress and strain occurred on the ratcheting box open end wrench during the tightening of nuts or bolts is simulated by finite element method. The measured strains are used to verify the accuracy of boundary conditions for finite element model. The h-convergence, which element size is reduced, is used to. Check the convergence of solution, the simulate principal stress is used to predict the crack initiation and orientation, also the predicted crack is compared with a cracked wrench under the torque test. The crack initiation is quite coincident, but the crack orientation shows some different. The objective of optimal design is to minimize the principal stress of the wrench. The strength of the wrench is increased, but the weight is unchanged. Orthogonal array of Taguchi method is used to carry out simulations of different combinations of chosen parameters. The results show that the maximum principal stress on the open end for the optimal design is reduced about 4.2% compared with the original design.