Wiper tools are revered for their capacity to simultaneously achieve high-quality and high-efficient machining.Nonetheless,the cutting mechanism of wiper tools remains unclear,and the cutting force prediction model of...Wiper tools are revered for their capacity to simultaneously achieve high-quality and high-efficient machining.Nonetheless,the cutting mechanism of wiper tools remains unclear,and the cutting force prediction model of wiper tools has not been reported,leading to severe wear of the bottom wiper edge and unstable cutting in machining processes.In this study,the cutting mechanism of wiper tools is systematically analyzed,and the mechanistic cutting force model considering the wiper edge cutting effect was established.The cutting force coefficients were calibrated by the cutting force separation method,which can quickly calibrate the cutting force coefficients for the flank cutting region dominated by the shear effect,the bottom cutting region dominated by the shear effect,and the bottom wiper region dominated by plough effect.Compared with measured cutting forces,the maximum average absolute errors in the predicted forces are 9.2%,7.6%,and 9.3%in the x,y,and z directions,respectively.Furthermore,the feed rate and the length of the wiper edge were primary determinants of the bottom-edge cutting forces.This study provides theoretical guidance and technical support for the wear mechanism and design of wiper tools.展开更多
Fracture occurred in wiper arm. Through the macro and micro analysis of the wiper arm fracture, chemical composition analysis, metallographic structure analysis, hardness analysis, macrostructure analysis, SEM analysi...Fracture occurred in wiper arm. Through the macro and micro analysis of the wiper arm fracture, chemical composition analysis, metallographic structure analysis, hardness analysis, macrostructure analysis, SEM analysis and so on, the cause of fracture of wiper arm were analyzed. The results show that the high hardness and the large residual stress are the main reasons for the cracking of the wiper arm due to the coincidence between the steel pipe forming weld and the wiper arm forming weld, and the improvement measures are proposed.展开更多
Various soft materials,e.g.,papers,cloths,and sponges,can absorb water.In this study,we demonstrated the influence of the surface free energy of liquid and the liquid distribution on the friction behavior of a paper w...Various soft materials,e.g.,papers,cloths,and sponges,can absorb water.In this study,we demonstrated the influence of the surface free energy of liquid and the liquid distribution on the friction behavior of a paper wiper on a glass plate.The friction test was performed by varying the liquid content in the paper wiper.Compared with the dry condition,the friction coefficient increased 5.14 times when a certain part of the interface was occupied with water.We found that this high friction effect decreased with the surface free energy of the liquid,and the contact between the liquid droplets in the paper wiper and the glass plate was required to realize a high friction effect.This high friction effect is observed for paper wipers and other soft materials that can absorb liquids,e.g.,cloths and sponges,and the findings of this study are expected to help design the friction properties of soft materials containing small amounts of liquid.展开更多
For precision machining, the hard turning process is becoming an important alternative to some of the existing grinding processes. This paper presents an analytical model for predicting cutting forces in hard turning ...For precision machining, the hard turning process is becoming an important alternative to some of the existing grinding processes. This paper presents an analytical model for predicting cutting forces in hard turning of 51CRV4 with hardness of 68 HRC. The cutting tool used is made from cubic boron nitride （CBN） with a wiper cutting edge. Formulas for differential chip loads are derived for three different situations, depending on the radial depth of cut. The cutting forces are determined by integrating the differential cutting forces over the tool-workpiece engagement domain. For validation, cutting forces predicted by the model were compared with experimental measurements, and most of the results agree quite well.展开更多
基金Supported by National Key Research and Development Program of China(Grant No.2018YFA0702900)National Natural Science Foundation of China(Grant Nos.52075076,U1908231)。
文摘Wiper tools are revered for their capacity to simultaneously achieve high-quality and high-efficient machining.Nonetheless,the cutting mechanism of wiper tools remains unclear,and the cutting force prediction model of wiper tools has not been reported,leading to severe wear of the bottom wiper edge and unstable cutting in machining processes.In this study,the cutting mechanism of wiper tools is systematically analyzed,and the mechanistic cutting force model considering the wiper edge cutting effect was established.The cutting force coefficients were calibrated by the cutting force separation method,which can quickly calibrate the cutting force coefficients for the flank cutting region dominated by the shear effect,the bottom cutting region dominated by the shear effect,and the bottom wiper region dominated by plough effect.Compared with measured cutting forces,the maximum average absolute errors in the predicted forces are 9.2%,7.6%,and 9.3%in the x,y,and z directions,respectively.Furthermore,the feed rate and the length of the wiper edge were primary determinants of the bottom-edge cutting forces.This study provides theoretical guidance and technical support for the wear mechanism and design of wiper tools.
文摘Fracture occurred in wiper arm. Through the macro and micro analysis of the wiper arm fracture, chemical composition analysis, metallographic structure analysis, hardness analysis, macrostructure analysis, SEM analysis and so on, the cause of fracture of wiper arm were analyzed. The results show that the high hardness and the large residual stress are the main reasons for the cracking of the wiper arm due to the coincidence between the steel pipe forming weld and the wiper arm forming weld, and the improvement measures are proposed.
基金the financial support of JSPS KAKENHI Grant Number JP23K19086.
文摘Various soft materials,e.g.,papers,cloths,and sponges,can absorb water.In this study,we demonstrated the influence of the surface free energy of liquid and the liquid distribution on the friction behavior of a paper wiper on a glass plate.The friction test was performed by varying the liquid content in the paper wiper.Compared with the dry condition,the friction coefficient increased 5.14 times when a certain part of the interface was occupied with water.We found that this high friction effect decreased with the surface free energy of the liquid,and the contact between the liquid droplets in the paper wiper and the glass plate was required to realize a high friction effect.This high friction effect is observed for paper wipers and other soft materials that can absorb liquids,e.g.,cloths and sponges,and the findings of this study are expected to help design the friction properties of soft materials containing small amounts of liquid.
基金Supported by the DAAD (German Academic Exchange Service) on its exchange student program
文摘For precision machining, the hard turning process is becoming an important alternative to some of the existing grinding processes. This paper presents an analytical model for predicting cutting forces in hard turning of 51CRV4 with hardness of 68 HRC. The cutting tool used is made from cubic boron nitride （CBN） with a wiper cutting edge. Formulas for differential chip loads are derived for three different situations, depending on the radial depth of cut. The cutting forces are determined by integrating the differential cutting forces over the tool-workpiece engagement domain. For validation, cutting forces predicted by the model were compared with experimental measurements, and most of the results agree quite well.
