Gao F.,Shanghai JiaoTong University |
Guo W.,Shanghai JiaoTong University |
Song Q.,Dalian Design and Research Institute |
Du F.,Yanshan University
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2010
Manufacturing is the means by which material wealth and civilization are created and as such it has been fueling the growth of new industrialization in our country. It takes manufacturing to transform the results of research and technological development in many fields into products that fulfill human needs and improvement in productivity. Since the turn of the century, core competencies coming forth in the world are high-tech industries. Severe challenges facing us today due to dwindling natural resources, non-renewable energy sources as well as worsening environment call for a brand new thinking in the development of manufacturing science and technology. The national strategic projects have to be supported by extreme manufacturing capability. Reliable service under extreme conditions becomes basic characteristics and requirement for complex manufacturing equipment. Heavy-duty and large capacity manufacturing equipment, due to huge size, heavy payload, large inertia, multi degree-of-freedom, dexterous manipulability, extreme service conditions, is much more difficult to design and manufacture. The principles for energy and matter transformation of man-made systems are the research subjects of manufacturing science. The heavy-duty manufacturing equipment is studied such as super-capacity freeform forging machines, heavy-duty forging manipulators, large payload multi-link mechanical presses and servo mechanical presses, rolling mills, and heavy-duty machine tools. It reviews the development trend in this field and analyzes the gap between China and the state of art in the world. It proposes fundamental scientific and technological issues facing the development of heavy-duty manufacturing equipment including process models and performance evaluation criteria, mapping rules between mechanism and structure topology and performances, principles of fast responses of high power and precision, and fault-tolerant drives, as well as interaction and control of electric and hydraulic coupled systems. The research presented in this paper contributes to China's technological development strategy for heavy-duty manufacturing equipment. © 2010 Journal of Mechanical Engineering.
Xia Y.-M.,State Key Laboratory of High Performance Complex Manufacturing |
Xia Y.-M.,Central South University |
Luo D.-Z.,State Key Laboratory of High Performance Complex Manufacturing |
Luo D.-Z.,Central South University |
Zhou X.-W.,Dalian Design and Research Institute
Meitan Xuebao/Journal of the China Coal Society | Year: 2011
According to the complexity and fuzziness of geology adaptability cutter selection for shield, a new method of geology adaptability cutter selection based on fuzzy theory was proposed. Two factors affecting geology adaptability cutter selection-rockmass uniaxial compressive strength and integrity, were determined. Respectively, fuzzy adaptability relationship and adaptability membership functions of cutter versus the two factors were established through fuzzy mathematics theory. And a fuzzy synthetic evaluation model was established. Cutter selection for some kind of rockmass(Rc=75 MPa, RQD=66%) was carried out with this method. The results indicate that it's able to cut this kind of rockmass using single disc cutter.
Yuan G.-M.,Yanshan University |
Yuan G.-M.,Dalian Design and Research Institute |
Li M.-L.,Dalian Design and Research Institute |
Xiao H.,Yanshan University
Kang T'ieh/Iron and Steel (Peking) | Year: 2011
In order to improve the prediction precision of online model for vertical rolling force in roughing trains of hot strip mill, the process of hot strip roughing trains was simulated by the FEM simulation software DEFORM. The cause of low prediction precision of rolling force during vertical rolling was analyzed. Then the new method for calculating deformation degree when edge rolling was presented by analysis of the FEM simulated results. The formula of external stress status modulus, which is fit for the vertical rolling force calculation, was obtained by analytic regression. Furthermore, a new formula about rolling force calculation was gained. It was approved that the prediction precision was obviously enhanced compared with the practical data for vertical rolling force.
Li Z.,Yanshan University |
Peng Y.,Yanshan University |
Liu H.,Yanshan University |
Wang S.,Yanshan University |
Xiao L.,Dalian Design and Research Institute
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2013
For calculating deformation resistance in the warm rolling of plate steel, a new rolling force model was proposed based on non-constant value of deformation resistance. Contact arc of deformation zone was discretized into micro-segment unit, and the deformation resistance model of segmented micro cell about deformation and deformation rate was established, unit rolling pressure of segmentation unit was calculated that unit arc replaced by line based on Karlman balance differential equations. Deformation process of warm-rolling was simulated using ANSYS/LS-DYNA finite element. The comparison of the two calculation results indicates that the new model has high accuracy and is more conforming to actual production.
Wang J.,Yanshan University |
Liu C.-Q.,Yanshan University |
Liu C.-Q.,Dalian Design and Research Institute |
Xiao H.,Yanshan University
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2012
The calculation process and file composition of the pre-setup model for finishing rolling of hot continuous rolling, were investigated. Another deformation resistance model was added to its original model by creating regression coefficient file and modifying input and calculation model using C language. Compared with the predicted values of rolling force with original resistance model, the result demonstrates that calculation precision of rolling force with modified resistance model could be satisfactory. Smoothing coefficient was a key factor for self-adaptive. After the influence factors of smoothing coefficient were summarized, the dynamical optimized model of smoothing coefficient was established. Then the rolling forces were calculated using the programming with actual data using the dynamical optimized model. The analysis of the errors after optimization clearly shows that dynamical optimization of smoothing coefficient is more helpful to improve the prediction precision of rolling force model.