Zhejiang Provincial Key Laboratory of Part Rolling Technology

Ningbo, China

Zhejiang Provincial Key Laboratory of Part Rolling Technology

Ningbo, China

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Peng W.,Ningbo University | Peng W.,Zhejiang Provincial Key Laboratory of Part Rolling Technology | Zhu J.,Ningbo University | Zhu J.,Zhejiang Provincial Key Laboratory of Part Rolling Technology | And 2 more authors.
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | Year: 2017

By using ANSYS/LS-DYNA software, the finite element(FE) model of cross-wedge rolling of laminated shafts was established. Some thickness-radius ratio rolling experiments were carried out under the orthogonal experimental designed with four factors and three levels. Through finite element simulation, the effect of process parameters including forming angle, spreading angle, area reduction and rolling temperature on thickness-radius ratio were analyzed. The results show that the rolling experimental results accord with the simulation results, which shows that finite element model can be used to predict thickness-radius ratio. With the increase of spreading angle, the thickness-radius ratio sharply decreases first and then slowly decreases. With the increase of temperature, the thickness-radius ratio strengthens first and then slowly strengthens. With the increase of area reduction, the thickness-radius ratio slowly strengthens first and then changes little. With the increase of forming angle, the thickness-radius ratio change is not obvious. The influencing sequence on the thickness-radius ratio is spreading angle, rolling temperature, area reduction and forming angle in turn. The research results contribute to control and design clad material thickness and matrix material radius size of laminated shaft. © 2017, Chinese Society for Composite Materials. All right reserved.


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


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.


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.


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.


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

In order to solve the stub bar defects and improve the material utilization, this paper proposes the method of using billet with circular arc shape on the end face to control the end concavity. It establishes the cross wedge rolling finite element model by DEFORM-3D software, and through the displacement method to analyze the flow law of metal of rolled piece on the end face, and obtains the influence law of end concavity with different circular arc angles by numerical simulation. Finally, it gets the result that the end concavity length decreases with the increase of the circular arc angle. In comparison with the original billet, when the angle is 90°, the end concavity of rolled piece reduces by 69.04%. The results provide a theoretical basis for saving material and achieving the cross wedge rolling production without the stub bar. © (2014) Trans Tech Publications, Switzerland.


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.


Lou J.-Q.,Zhejiang Provincial Key Laboratory of Part Rolling Technology | Wei Y.-D.,Zhejiang University | Yang Y.-L.,Zhejiang University | Xie F.-R.,Zhejiang University
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | Year: 2014

Due to the structure characteristics and the influence of the manipulation object at the end, the space multi-link manipulator is a complex nonlinear system with strong rigidity-flexibility coupling. Based on the classical vibration theory, the bending and torsional deformation assumptions for the flexible manipulators are proposed, and the dynamic equations of a space flexible manipulator are established using assumed mode methods and Lagrange equations. To suppress the elastic vibration of the system, an adaptive fuzzy velocity control strategy based on Lyapunov stability is presented. The simulation results show that the elastic vibration of the flexible manipulator cannot be avoided in the rotating motion. By applying the proposed control strategy and making use of the PZT shear actuator and torsional actuator, not only both the bending and torsional vibration of the flexible manipulator is effectively suppressed, but also the control torque of the servo-motor is reduced and the positioning accuracy of the manipulator is improved.


Lu F.-D.,Zhejiang University | Lu F.-D.,Zhejiang Provincial Key Laboratory of Part Rolling Technology | Gao D.,Zhejiang University | Gao D.,Zhejiang Provincial Key Laboratory of Part Rolling Technology
Advances in Mechanical Engineering | Year: 2014

In some microelectronic products, one or several components can be idealized as simply supported beam type and viewed as vulnerable elements or critical component due to the fact that they are destroyed easily under impact loadings. The composite cushioning structure made of expanded polyethylene (EPE), and expanded polystyrene (EPS) was utilized to protect the vulnerable elements against impact loadings during transportation. The vibration equations of composite cushioning system were deducted and virtual mass method was applied to predict impact behavior of critical component. Numerical results indicate that virtual mass method is appropriate for computing impact response of composite cushioning system with vulnerable element of simply supported beam type, which is affirmed by the fact that the impact responses of structure element in terms of velocity- and displacement-time curves are almost unchanged when virtual mass is smaller than a certain value. The results in this paper make it possible for installation of packaging optimization design. © 2014 Fu-de Lu and De Gao.


Wu H.,Zhejiang University | Wu H.,Zhejiang Provincial Key Laboratory of Part Rolling Technology | Guo L.,Zhejiang University
Materials and Manufacturing Processes | Year: 2014

TC21 is a new type of titanium alloy that is difficult to cut. In this research, a series of orthogonal turning tests are performed to investigate the cutting mechanisms of TC21. The effects of tool geometrical parameters and cutting conditions on turning force are analyzed in detail. In addition, the orthogonal turning process of TC21 alloy is simulated using a presented three-dimensional finite element model (FEM). The results proved that tool geometrical parameters and cutting conditions have a great effect on the turning force. Further, the results of simulation agreed well with those of the experiments, and the FEM can be used to reveal the high-speed machining behavior of TC21 alloy. © 2014 Taylor & Francis Group, LLC.

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