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Wu H.,Zhejiang University | Wu H.,Zhejiang Provincial Key Laboratory of Part Rolling Technology | Wang P.,Tianjin Jinhang Institute of Technical Physics
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

To investigate the cutting mechanism of the titanium alloy TC4 in the ultra-precision cutting process, an orthogonal cutting finite element model was established. The key techniques of modeling the FEM model and the material model were introduced detailed. The ultra-precision cutting process of titanium alloy was simulated using the established FEM model. The chip formation, cutting force and cutting temperature were obtained. To validate the simulation, an ultra-precision turning experiment has been carried out by single point diamond turning machine. Through the comparison of chip formation and cutting force, the result of simulation agrees with the result of experiment. It proves that the FEM method is an effective method can be used to investiate the ultra-precision cutting mechanisms of titanium alloys. ©, 2014, Chinese Society of Astronautics. All right reserved. Source


Wu H.,Zhejiang University | Wu H.,Zhejiang Provincial Key Laboratory of Part Rolling Technology | Zhang S.,Nanchang University
International Journal of Advanced Manufacturing Technology | Year: 2015

Titanium alloy is a difficult-to-cut material, widely used due to its excellent material and mechanical properties. In this paper, the cutting mechanisms of titanium alloy Ti6Al4V under up-milling and down-milling with different cutting conditions have been theoretically and experimentally discussed. The milling processes were simulated by an orthogonal cutting finite element model. And a series of milling experiments were carried out to verify the simulated results. Significantly, it elaborates the prominent differences of cutting mechanisms of titanium alloy between up-milling and down-milling. © 2014, Springer-Verlag London. Source


Wu H.,Zhejiang University | Wu H.,Zhejiang Provincial Key Laboratory of Part Rolling Technology
International Journal of Advanced Manufacturing Technology | Year: 2016

Titanium alloy Ti6Al4V is a distinctive material widely used in modern industries since it has low density and high strength, and performs well in high temperature and corrosion resistance. However, relatively little work on cutting mechanism of ultra-precision machining (UPM) of Ti6Al4V has been conducted. In this study, a series of cutting tests have been carried out to study the cutting mechanism of Ti6Al4V in UPM. The effects of cutting conditions (spindle speed, feed rate, and depth of cut) on surface roughness and cutting forces have been discussed for improving surface quality. In addition, one finite element model (FEM) was proposed to investigate chip formation and cutting forces in UPM, which has been supported well by cutting tests. © 2016 Springer-Verlag London Source


Hu L.,Zhejiang University | Zhan J.,Ningbo University | Zhan J.,Zhejiang Provincial Key Laboratory of Part Rolling Technology
International Journal of Advanced Manufacturing Technology | Year: 2015

In the process of curved surface polishing and buffing, the tools have to be compressed on the workpiece and moved to wear the surface, so the normal force and tangential feed movements should be provided and controlled synchronously. It is a typical kind of compliant control, which would most likely be done under the hybrid motion/force control policy. Although its related theory is already almost perfect, this method could seldom be used in the process of curved surface polishing and buffing, if ever, for it is always not easy to orthogonalize force control space from movement control space. In this paper, a force control subsystem is developed and fixed on a computer numerical control (CNC) lathe to control the normal force independently, and the normal force control space is orthogonalized from the feed movement control space by geometry defining for aspheric surface polishing. Furthermore, the orthogonalization in the domain of time is taken to make the force control not to interpolate with the displacement control of the feed movements. Experiments in controlling and polishing the normal force show that the hybrid motion/force control policy could be used in the process of aspheric surface polishing and buffing by keeping the normal force control and feed movement control independently in both domains of space and time. © 2014, Springer-Verlag London. Source


Hu B.,Ningbo University | Hu B.,Zhejiang Provincial Key Laboratory of Part Rolling Technology
Applied Mechanics and Materials | Year: 2014

The paper is based on the newest hollow railway axle, which utilizes the Pro/E designed multi-wedge cross wedge rolling (MCWR) model, utilizes the finite element analysis software DEFORM-3D to complete the numerical simulation about the whole stage of the hollow railway axle forming process, and analyzes the strain rule at the broadening stage of the hollow railway axle, especially conducts a detailed research on forming character into the strain rule at the multi-wedge transition stage, and finally gets the strain forming mechanism of the hollow railway axle at the broadening stage. The result of the research on the strain rule poses great scientific significance on enhancing the product quality and the production efficiency of the hollow railway axle, and improving the theory of multi-wedge cross wedge rolling. © (2014) Trans Tech Publications, Switzerland. Source

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