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检索条件"任意字段=第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议"

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Research on Data Processing in Reverse Engineering

Research on Data Processing in Reverse Engineering

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： ZHAO C,MENG Xianglin Institute of Mechanical Engineering,Heilongjiang University of Science & Technology,Harbin Heilongjiang 150027,China

This paper is to improve the speed of k-nearest-neighbor search and put forward algorithms related to tangent plane estimation based on existing *** from the points cloud,the algorithm segments the whole data into many different small cubes in space,and the size of cube is related to the density of the points *** the position in which the point in the cube,the algorithm enlarges the area around the given point step by step until the k-nearest-neighbor is *** neighbor's least-squares tangent plane is *** order to orient the planes,the k-nearest-neighbor is introduced into the problem of seeking the minimum spanning trees instead of searching the whole *** research proved that the algorithms put forward in this paper were effective in processing data in short time and with high *** theory was useful for the practical application in reverse engineering and other areas *** for finding k-nearest-neighbor problem,which is still cost much time in present,was provided,and a propagation algorithm for orient the planes was also *** algorithm chose the orientation among the k-nearest-neighbor of the current point.

关键词： Reverse Engineering,Points Cloud,Normal Vector,Least-Squares,Minimum Spanning Tree

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The 3D Design and Numerical Simulation of Two-phase Flow in the Laser Rapid Prototyping Coaxial Powder Delivery System

The 3D Design and Numerical Simulation of Two-phase Flow in ...

引用

第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Wang Zhijian1 Zhang Anna2 Shang Xiaofeng1 1.School of Mechanical and Electrical Engineering,Shenyang Institute of Aeronautical Engineering,Shenyang,Liaoning,110136,China 2.Liaoning Province Meteorology Information and Technical Support Center,Shenyang,110015,China

The metal powder direct and rapid prototyping technology is one of the most developing methods in the Laser rapid prototyping *** the coaxial powder delivery system is the key *** purpose of this paper is to introduce a new type of coaxial powder delivery system and simulate the metal powder and shield gas flow in the powder ***,a 2D and a 3D model of the new coaxial powder delivery system are *** gas-solid two-phase flow model and the k-ε turbulent model are selected to simulate the flow of metal powder in powder *** the Euler-Lagrange method is used in the simulating computation The results demonstrates that the new coaxial powder delivery system has stable performance,uniform powder flux,high cooling efficiency and long useful life,which are especially important in the laser rapid prototyping system.

关键词： Laser rapid prototype,coaxial powder delivery system,numerical simulation,pressure distribution,velocity distribution.

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Research on Welding Path Planning of Robot MIG Manufacturing

Research on Welding Path Planning of Robot MIG Manufacturing

引用

第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Liang Yuanyuana Zhu Shenga a National Key Laboratory for Remanufacturing,Beijing 100072,China

With the rapid development of the manufacturing,the direct forming technology of metal parts has become an important component of the manufacturing *** the work around the parts forming technique in the robot MIG welding manufacturing system,this paper concerns on the welding path of the deposition forming for single-layer plate with multipass weld,which could provide theoretical guidance for the latter multi-layer plate with multipass weld forming,as well as technical support for the further study of *** with the forming for single-layer plate with multipass weld,the overlap of weld has been gained by using the superposition *** the welding path planning has been done based on the result of parameter *** the possible path of welding torch during welding,such as sequential welding,alternative welding,end to end welding,ecto-entad welding,ento-ectad welding,both sides to middle welding,middle to both sides welding,take the method of deflection analysis to evaluate the quality of the depositing layer,and a best welding path has been gotten.

关键词： robot MIG welding remanufacturing single multipass forming process optimization, path planning

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A computing method of accurate slice contours based on STL model

A computing method of accurate slice contours based on STL m...

引用

第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Jibin Zhao Renbo Xia Weijun Liu Huabing Wang Key Lab of Advanced Manufacturing Technology,Shenyang Institute of Automation,Chinese Academy of Sciences,Nanta Street 114#,Shenyang,110016,China.

STL model has become a standard of RP technology,but the slice error due to tessellation is so *** improve the precision of slice contours,a novel slicing method is presented to compute accurate contours curve based on STL *** first,normal vector of two vertices sharing an edge of a triangle facet to be sliced is calculated,An interpolation curve is constructed in normal section to proximate the original curve in normal section in terms of the position of the two vertices and the tangent vector at the two *** exact points belonged to slice contour are obtained by calculating intersection points between the interpolation curve and slice *** last,the accurate smooth contours are achieved by fitting the intersection points with cubic B-spline *** shows that the presented method is feasible and reliable,the precision of cross contours from proposed slicing method approximates to direct slicing of original CAD model.

关键词： Rapid prototyping Slicing STL model CAD

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The Research on Functionally gradient Material Laser Rapid Prototyping Technique

The Research on Functionally gradient Material Laser Rapid P...

引用

第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Wang Wei Shang Xiaofeng School of Mechanical and Electrical Engineering,Shenyang Institute of Aeronautical Engineering,Shenyang,Liaoning,110136,China

Functionally gradient material(FGM)is a sort of new style complex *** metal functionally gradient material laser rapid prototyping may expediently,rapidly,economically manufactures the jumbo size,shape complex,metallurgical bonding metal FGM *** is developed based on the rapid prototyping increasing material manufacture *** metal FGM part can be manufactured through layer-by-layer changing materials composition proportion and depositing *** materials composition proportion is changed through the real time change proportion delivering powder device and the metal powder is deposited by the high power laser *** design method of material component distributing rule in the part entity is *** gradient changing rule and the realizing way of face,line and point gradient is studied and the file format combining the material information and geometry information is put *** real time changing proportion allocation technique of three metal powder,powder uniformly mixing technique and coaxial delivering powder technique are *** to the principle of the constant output powder cumulative volume in unit time,the real time powder allocation formulae of three types of powder material are deduced.

关键词： Functionally gradient material,Laser rapid prototyping,Metal powder laser shaping,Powder delivery device.

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Investigation on Fracture Criterion of Sheet-Metal based on Laser Shock Forming

Investigation on Fracture Criterion of Sheet-Metal based on ...

引用

第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Jiang Yinfang1 Shi Chaoyang1 Ren Xudong1 Wang Fei1 Zhu Yuanyou2 1.School of Mechanical Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China 2.Department of Mechanical Engineering,Nanjing Institute of Technology,Nanjing Jiangsu 210013,China

Laser shock forming(LSF)of sheet metal is a novel technology in plastic *** is necessary to correctly predict fracture of metal sheet in LSF of sheet *** on the he fracture criterion of 3003H16 aluminum alloy sheet metal in traditional punching theory,the reduction of thickness is displayed obviously in the process of fracture of metal sheet,so thickness parameters can judge whether metal sheet is fracture,the basic parameters are found by experiment and simulation,the fracture criterion of 3003H16 aluminum alloy sheet metal is founded and verified by numerical simulation and LSF *** result shows that this failure criterion can be used in the LSF numerical simulation to predict the thickness thinning state,which is used to judge the forming characteristics of LSF of metal sheet;this failure criterion is basically suitable for fracture criterion of LSF of metal sheet.

关键词： Aluminum alloy Laser shock forming(LSF) Maximum thickness reduction rate Fracture criterion

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Process and Technology of Rapid Prototyping of A μ-Micro Motor

Process and Technology of Rapid Prototyping of A μ-Micro Mo...

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Wei Zheng 1 Hui Zheng 2 Rui Liao 1 1Department of Mechanical and Electrical Engineering,School of Physics & Mechanical and Electrical Engineering,Xiamen University,Fujian 361005,China 2China Telecom(Xiamen),Fujian 361012,China

Purpose-The purpose of this paper is to present an advanced process and technology of rapid prototyping of a μ-Micro Motor which is different from the traditional machining and the new manufacturing ***/method/approach-The rapid prototyping of a μ-micro motor is a nontraditional machining and an advanced manufacturing technology(AMT)to be realized by using *** process and fabrication are going at the same *** one thing,the μ-micro motor is fabricated by the MEMS process;for another,the structure design must be considered to fabricate or assembly the parts during machining the motor in the meantime,which motor is an end product after finishing ***-The research proved that integration of IC process and MEMS using masks are effective in obtaining the rapid prototyping manufacturing of the μ-micro *** the mature technique to fabricate the motor,there are advantages to produce the motor in short *** implications-The motor is a power source of micro machines to be applied to military and civilian,for example,applied to micro robot,micro bio medicine and micro ***/value-The size of the motor is 190μm in maximum diameter by 125μm in height that is bulk machined in array with the number of hundreds of micro *** micro motor costs lower.

关键词： micro motor,nontraditional machining,advanced manufacturing technology

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Experimental Study of Implementation of Octagonal Internal Structure for Investment casting SL Patterns

Experimental Study of Implementation of Octagonal Internal S...

引用

第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Y.Norouzi S.Rahmati Y.Hojjat Mechanical Engineering Group Imam Husain university

This paper presents the experimental study of octagonal lattice structure for investment casting stereolithography patterns,and comparing it with the former hexagonal structure of the QuickCast 2.0 *** research aims to introduce a new internal structure for investment casting SL *** this study,a simple 3D coupled thermal-mechanical finite element analysis;magnitudes of exerted hoop stresses on ceramic shell(during burnout stage)have been *** a new generation of internal structure(or a new buildstyle)for investment casting SL patterns is presented *** significant reduction of critical loadings on ceramic shell will ensure investment casting process via using SL patterns of an octagonal internal *** an experimental observation of stress evaluation for hexagonal and octagonal models,magnitudes of hoop and axial strains have been evaluated by installing self-temperature compensation strain gauges,for cylindrical *** results for new octagonal structure indicate that,there is a 62% reduction in maximum hoop stresses exerted on the ceramic ***,a significant reduction of strain has been observed in both hoop and axial strains applying strain-gauging analysis(near 50% reduction).

关键词： Investment casting,Quickcast,Internal Lattice Structure,Offset Octagon Structure.

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Research on Surface Forming and Virtual Model of Simulation Based on IGES

Research on Surface Forming and Virtual Model of Simulation ...

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Gaiyun HE Jinlu WANG Huijiang ZHENG Jian LIUTianjin Key Lab.for Advanced Manufacturing Tech.and Equipment,Tianjin University,Tianjin 300072,China

In order to realize the data transmission between general modeling software and 3D virtual simulation system and real time interaction with simulation model,the topological information of Initial Graphics Exchange Specification(IGES)had been deeply studied,the storage structure of all geometry elements' information had been put forward,the process of converting the general surface of revolution to NURBS surface had been derived in *** data structure and program algorithm according to IGES had been programmed,which is developed on the Visual C++ *** structural bodies for different geometry elements had been defined and encapsulated into *** surface formation based on IGES file and the interactions with the virtual model were realized by means of OpenGL Graphics *** embodied the advantages of taking surface as entity in constructing 3D *** program read an IGES file with file size about 2M and the model was displayed successfully.

关键词： Initial Graphics Exchange Specification,Virtual model of simulation,complicated surface,3D model

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Research and Realization of Auto-Calibration Technique Based On Stereovision

Research and Realization of Auto-Calibration Technique Based...

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： CHENG Jun-ting and ZHAO Can Institute of Mechanical Engineering,Heilongjiang University of Science & Technology,Harbin,150027,P.R.China

Purpose-The purpose of this paper is to analyze present-day state on calibration technique and to realize the auto-calibration technique based on projected grating 3D measuring ***/methodology/approach-Auto-calibration technique which was named as multiple target tracking for detecting outline based on random placing and regular number was put *** practical arithmetic was also presented at the same ***-According to the arithmetic mentioned above,the relevant experimental result was ***,the precision of calculation result was *** results showed that the operation was simplified,the orientation precision of image outline edge was ensured and calibration precision was kept within 0.02～0.05mm by using the arithmetic in this *** implications-The research verified the feasibility of auto-calibration,providing arithmetic that is extremely useful for the industrial application of computer vision ***/value-The paper deals with experimental work on innovative techniques on which data are still lacking in *** particular,an original auto-calibration technique which is named as multiple target tracking for detecting outline based on random placing and regular number is provided.

关键词： Projected grating,Auto-calibration,Stereovision,Multiple target tracking

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