A kind of 3D color graphics display system for the STL model is developed by calling the functions from Open GL graphic library through VC++6.0 under the Windows environment in this paper. The STL model is a high qual...A kind of 3D color graphics display system for the STL model is developed by calling the functions from Open GL graphic library through VC++6.0 under the Windows environment in this paper. The STL model is a high quality one that can be quiescent or animated. This system is conducive to find out the disfigurement of the STL model in a rapid prototyping process and to repair it. Therefore, the component quality can be enhanced.展开更多
目的 :研究医学3D打印技术相关的数据接口,分析其在网络化条件下的应用前景。方法 :根据三维计算机辅助设计(computer aided design,CAD)系统之间以及CAD系统与快速成型系统之间的数据接口标准,利用实例分析产品模型数据交换标准(standa...目的 :研究医学3D打印技术相关的数据接口,分析其在网络化条件下的应用前景。方法 :根据三维计算机辅助设计(computer aided design,CAD)系统之间以及CAD系统与快速成型系统之间的数据接口标准,利用实例分析产品模型数据交换标准(standard for the exchange of product model data,STEP)、STL文件格式和相应的网络化技术在医学3D打印领域的应用模式。结果:将STEP的实体描述与可扩展标记语言(extensible markup language,XML)的网络适应性特点相结合,实现了异地异构CAD系统和快速成型系统间的数据交换。结论:STEP和XML技术为医学3D打印业务的拓展和深化提供了新的思路和手段。展开更多
An algorithm for compensating the varying section contour within the extent of each layer thickness is proposed to improve the rapid prototyping part’s shape and size precision.
3D printing is a rapid prototyping technology to shape materials or objects through printing layer by layer driven by digital models, which can be adopted for the manufacture of refractory precast components. Thus, th...3D printing is a rapid prototyping technology to shape materials or objects through printing layer by layer driven by digital models, which can be adopted for the manufacture of refractory precast components. Thus, the production technology of refractory precast components as well as the technique and advantages of 3D printing was introduced. The feasibility and application prospect of 3D printing concrete, contour crafting and adhesive 3D printing in refractory precast components were presented.展开更多
3D printing can spur manufacturing rebirth in Nigeria and the World in general. There are many areas where 3D printing is creating significant change, particularly in designing and prototyping of new products, in the ...3D printing can spur manufacturing rebirth in Nigeria and the World in general. There are many areas where 3D printing is creating significant change, particularly in designing and prototyping of new products, in the arts, and in visualizing abstract concepts. This is a step change from conventional manufacturing processes to rapid prototyping and layer manufacturing. This report has defined rapid prototyping, rapid manufacturing and the current technologies available to fabricate 3D components. In addition to this, it provides a brief overview of the current contributions of the Edo University Iyamho (EUI) in collaboration with the Federal University of Petroleum Resources, to sustain manufacturing research initiatives towards the development of locally fabricated 3D printer and the possible future Additive Manufacturing in Nigeria. It is anticipated that this work will benefit the Nigerian academic, research institutes, industries, thus, enhance the GDP contribution of the manufacturing sector in Nigeria.展开更多
Experiment of rapid prototyping (RP) is a multi-level and multi-factor problem with long process cycle. As powder-based RP method, three dimensional printing (3DP), and selective laser sintering (SLS) are the most pro...Experiment of rapid prototyping (RP) is a multi-level and multi-factor problem with long process cycle. As powder-based RP method, three dimensional printing (3DP), and selective laser sintering (SLS) are the most prominent RP methods for their flexibility in material selecting. The research of 3DP process shows that much experiments work can be greatly decreased by the method of uniform design with restricted mixtures for RP products’ performance to its forming material. Then, according to backward regression methods, the binomial and inverse terms nonlinear regression equations were set up by statistic analysis and computation. Together with evaluation function method, multi-object optimization model for performance of products to the powder mixtures was developed, and the optimization problem was solved by software MATLAB. After that, the optimum results were solved and tested by experiment with the same condition as before. Differences between the calculation results and testing results, which including product’s density, compression strength, surface evaluation, and deformation in three dimensions, are less than 10%, and have the same error direction. Uniform 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 RP and other process which have a long processing cycle.展开更多
文摘A kind of 3D color graphics display system for the STL model is developed by calling the functions from Open GL graphic library through VC++6.0 under the Windows environment in this paper. The STL model is a high quality one that can be quiescent or animated. This system is conducive to find out the disfigurement of the STL model in a rapid prototyping process and to repair it. Therefore, the component quality can be enhanced.
文摘目的 :研究医学3D打印技术相关的数据接口,分析其在网络化条件下的应用前景。方法 :根据三维计算机辅助设计(computer aided design,CAD)系统之间以及CAD系统与快速成型系统之间的数据接口标准,利用实例分析产品模型数据交换标准(standard for the exchange of product model data,STEP)、STL文件格式和相应的网络化技术在医学3D打印领域的应用模式。结果:将STEP的实体描述与可扩展标记语言(extensible markup language,XML)的网络适应性特点相结合,实现了异地异构CAD系统和快速成型系统间的数据交换。结论:STEP和XML技术为医学3D打印业务的拓展和深化提供了新的思路和手段。
基金Supported by College Science Foundation of Jiangsu(07KJB460113)
文摘An algorithm for compensating the varying section contour within the extent of each layer thickness is proposed to improve the rapid prototyping part’s shape and size precision.
文摘3D printing is a rapid prototyping technology to shape materials or objects through printing layer by layer driven by digital models, which can be adopted for the manufacture of refractory precast components. Thus, the production technology of refractory precast components as well as the technique and advantages of 3D printing was introduced. The feasibility and application prospect of 3D printing concrete, contour crafting and adhesive 3D printing in refractory precast components were presented.
文摘3D printing can spur manufacturing rebirth in Nigeria and the World in general. There are many areas where 3D printing is creating significant change, particularly in designing and prototyping of new products, in the arts, and in visualizing abstract concepts. This is a step change from conventional manufacturing processes to rapid prototyping and layer manufacturing. This report has defined rapid prototyping, rapid manufacturing and the current technologies available to fabricate 3D components. In addition to this, it provides a brief overview of the current contributions of the Edo University Iyamho (EUI) in collaboration with the Federal University of Petroleum Resources, to sustain manufacturing research initiatives towards the development of locally fabricated 3D printer and the possible future Additive Manufacturing in Nigeria. It is anticipated that this work will benefit the Nigerian academic, research institutes, industries, thus, enhance the GDP contribution of the manufacturing sector in Nigeria.
基金Supported by the Ph. D’s Start-up Fund in University of Shanghai for Science and Technology, China (No. 10D305)
文摘Experiment of rapid prototyping (RP) is a multi-level and multi-factor problem with long process cycle. As powder-based RP method, three dimensional printing (3DP), and selective laser sintering (SLS) are the most prominent RP methods for their flexibility in material selecting. The research of 3DP process shows that much experiments work can be greatly decreased by the method of uniform design with restricted mixtures for RP products’ performance to its forming material. Then, according to backward regression methods, the binomial and inverse terms nonlinear regression equations were set up by statistic analysis and computation. Together with evaluation function method, multi-object optimization model for performance of products to the powder mixtures was developed, and the optimization problem was solved by software MATLAB. After that, the optimum results were solved and tested by experiment with the same condition as before. Differences between the calculation results and testing results, which including product’s density, compression strength, surface evaluation, and deformation in three dimensions, are less than 10%, and have the same error direction. Uniform 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 RP and other process which have a long processing cycle.
