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,metallu...
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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.
Tissue engineering,a promising newly developed research field during last two decades,aims to reproduce personalized alternatives of human organs in vitro or in *** pivot of tissue engineering is to construct the comp...
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Tissue engineering,a promising newly developed research field during last two decades,aims to reproduce personalized alternatives of human organs in vitro or in *** pivot of tissue engineering is to construct the complex of cells and *** mimic the inner conditions of organs,scaffolds should provide temporary support for cells *** prototyping has been widely used in tissue *** paper presents two important RP technologies for tissue engineering applications:the Low-temperature Deposition Manufacturing(LDM)and the 3D Direct Controlled Cell Assembly Technology,of which basic principle,process,new progress and the potential prospects were introduced and discussed.
The biomaterial patch of electrospun collagen type I fibers was designed and prepared successfully in this *** collagen fibrous patches were produced by electrospinning of 7 various levels of concentrations(ranged fro...
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The biomaterial patch of electrospun collagen type I fibers was designed and prepared successfully in this *** collagen fibrous patches were produced by electrospinning of 7 various levels of concentrations(ranged from 8% to 20%w/v)of collagen *** tensile strength,yield strength and elastic modulus of 7 groups of electrospun collagen fibrous patches were determined in dry conditions using the electronic tensile test *** mechanical properties of 2 groups of above were recommended as a suitable surgical patch for clinical *** results showed no significant differences versus fresh porcine pericardium as *** SEM images of the 2 groups showed that the patches were smooth and uniform with the interwoven and porous *** the electrospun collagen fibrous patches have a great potential as a surgical biomaterial patch.
Electroforming is the highly specialised use of electrodeposition for the manufacture of metal *** ability to manufacture complex parts to close tolerances and cost effectively has meant that electroforming has applic...
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Electroforming is the highly specialised use of electrodeposition for the manufacture of metal *** ability to manufacture complex parts to close tolerances and cost effectively has meant that electroforming has applications both in precise molds and dies,aviation and spaceflight and so *** with unipolar pulse current electroforming,bipolar pulse current in electroforming is known to result in better precision and surface *** this paper,bipolar pulse current electroforming is *** influencing parameters,such as electrolyte parameter,additives,current density,PH value,temperature and pulse current parameters,have been studied in *** on nickel electroforming in molds and dies have been *** results indicated that bipolar pulse current electroforming could improve the quality and precision further,while reducing internal stress further.
As one kind of powder based Rapid Prototyping,Three Dimensional Printing(3DP)is one kind of the most prominent RP *** of 3DP is a multi-level and multi-factor problem,together with long process *** mass experiments wo...
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As one kind of powder based Rapid Prototyping,Three Dimensional Printing(3DP)is one kind of the most prominent RP *** of 3DP is a multi-level and multi-factor problem,together with long process *** mass experiments work was greatly decreased by method of Uniform Design with restricted mixtures for the 3DP products' performance to its forming ***,the binomial and inverse terms nonlinear regression equations were setup by SPSS statistic *** with evaluation function method,Multi-objective optimization model for products' performance to the powder mixtures was developed,and the optimization problem was solved by software of *** that,the optimum result were solved and tested by experiment with the same condition as *** between the calculation results and testing results is less than 10%,and having the same error *** Design method for regression and optimization was proved to be an excellent method to obtain optimum results for multi-level and multi-factor experiments of Rapid Prototyping with long processing cycle.
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...
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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.
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 t...
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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).
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 Spe...
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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.
The virtual surgery is one of technically difficult *** is necessary and of practical significance to apply VR to the micro-otosurgery,which is a functional operation with high precision and great *** virtual micro-ot...
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The virtual surgery is one of technically difficult *** is necessary and of practical significance to apply VR to the micro-otosurgery,which is a functional operation with high precision and great *** virtual micro-otosurgery system was designed and *** is adopted as virtual reality development tool,the organ model for mrico-otosurgery is reconstructed by anatomic slice image,the virtual operation instrument model is built based on method of photograph,and the knowledge library is built.3D panorama scanning,operation demonstrating and interaction operation module are developed,which can serve the operation training and planning.
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-calibratio...
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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.
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