3篇
您的检索式：作者名="Baoping Xi"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Design and Accuracy Analysis of a Metamorphic CNC Flame Cutting Machine for Ship Manufacturing显示文摘The current research of processing large size fabrication holes on complex spatial curved surface mainly focuses on the CNC flame cutting machines design for ship hull of ship manufacturing. However, the existing machines cannot meet the continuous cutting requirements with variable pass conditions through their fixed configuration, and cannot realize high-precision processing as the accuracy theory is not studied adequately. This paper deals with structure design and accuracy prediction technology of novel machine tools for solving the problem of continuous and high-precision cutting. The needed variable trajectory and variable pose kinematic characteristics of non-contact cutting tool are figured out and a metamorphic CNC flame cutting machine designed through metamorphic principle is presented. To analyze kinematic accuracy of the machine, models of joint clearances, manufacturing tolerances and errors in the input variables and error models considering the combined effects are derived based on screw theory after establishing ideal kinematic models. Numerical simulations, processing experiment and trajectory tracking experiment are conducted relative to an eccentric hole with bevels on cylindrical surface respectively. The results of cutting pass contour and kinematic error interval which the position error is from –0.975 mm to +0.628 mm and orientation error is from –0.01 rad to +0.01 rad indicate that the developed machine can complete cutting process continuously and effectively, and the established kinematic error models are effective although the interval is within a ‘large' range. It also shows the matching property between metamorphic principle and variable working tasks, and the mapping correlation between original designing parameters and kinematic errors of machines. This research develops a metamorphic CNC flame cutting machine and establishes kinematic error models for accuracy analysis of machine tools. | HU Shenghai ZHANG Manhui ZHANG Baoping CHEN Xi YU Wei | 2016 | Chinese Journal of Mechanical Engineering2016，29，5： | 3 |
| 2 | Deformation and instability failure of borehole at high temperature andhigh pressure in hot dry rock exploitation显示文摘 | Zhao Yangsheng Feng Zijun Xi Baoping | 2015 | Renewable Energy2015，77，： | 1 |
| 3 | Prospect of HDR geothermal energy exploitation in Yangbajing,Tibet,China,and experimental investigation of granite under high temperature and high pressure显示文摘Hot dry rock(HDR) geothermal energy,almost inexhaustible green energy,was first put forward in the 1970s.The development and testing of HDR geothermal energy are well reported in USA,Japan,UK,France and other countries or regions.In this paper,the geological characters of Yangbajing basin were first analyzed,including the continental dynamic environments to form HDR geothermal fields in Tibet,the tectonic characteristics of south slope of Nyainqêntanglha and Dangxiong-Yangbajing basin,and the in-situ stresses based on the investigations conducted,and then the site-specific mining scheme of HDR geothermal resources was proposed.For the potential development of HDR geothermal energy,a series of experiments were conducted on large-scale granite samples,200 mm in diameter and 400 mm in length,at high temperature and high triaxial pressure for cutting fragmentation and borehole stability.For the borehole stability test,a hole of 40 mm in diameter and 400 mm in length was aforehand drilled in the prepared intact granite sample.The results indicate that the cutting velocity obviously increases with temperature when bit pressure is over a certain value,while the unit rock-breaking energy consumption decreases and the rock-breaking efficiency increases with temperature at the triaxial pressure of 100 MPa.The critical temperature and pressure that can result in intensive damage to granite are 400-500 ℃ and 100-125 MPa,respectively. | Yangsheng Zhao Zijun Feng Baoping Xi Jinchang Zhao Zhijun Wan Anchao Zhou | 2011 | Journal of Rock Mechanics and Geotechnical Engineering2011，3，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员