Layered manufacturing technologies have been used to produce complex parts of diversified materials through different physical/chemical manufacturing principles. Nevertheless only a few materials are commercially available to build parts suitable for engineering applications. In this paper, the powder fusion of H13 tool steel is investigated. A high power Nd:YAG pulsed laser source on a CNC machine was used to fuse the powder, layer by layer, building solid cubes for further analysis. Four different laser vector scanning strategies were evaluated by comparing the results of porosity and layer distortion. The complexity of the laser/powder interaction shows that a complex strategy must be used to avoid porosity and distortion. [ABSTRACT FROM AUTHOR]
Munguía, Javier, Lloveras, Joaquim, Llorens, Sonia, and Laoui, Tahar
International Journal of Production Research. Apr2010, Vol. 48 Issue 8, p2261-2278. 18p. 2 Color Photographs, 9 Diagrams, 4 Charts, 2 Graphs.
Manufacturing processes, Artificial intelligence, Manufactures, Rapid prototyping, Trade routes, Relational databases, New product development, Decision making, Time management, Cost control, and Cost analysis
The purpose of this paper is to assess the possibility of using Rapid Manufacturing (RM) as a final manufacturing route through a comparison of RM capabilities vs. conventional manufacturing routes. This is done by means of a computer-aided system intended to guide the designer in the selection of optimum production parameters according to general product requirements proper of the first design stages. The proposed system makes use of a number of artificial intelligence (AI) tools, namely: fuzzy inference, relational databases and rule-based decision making to reach an optimum solution. A pilot application developed in Matlab® is presented to illustrate the system application on a real mechanical part used as a case study. In the article it is shown how the proposed model may be useful for presenting feasible RM alternatives for parts and products not originally intended for additive manufacture. It also indicates when no RM alternatives are suitable for the given tasks, thus indicating those areas of knowledge which are necessary to expand in order to have at disposal comprehensive and reliable info on RM to compete with conventional processes. [ABSTRACT FROM AUTHOR]
International Journal of Production Research. 8/15/2006, Vol. 44 Issue 16, p3325-3343. 19p. 1 Chart.
Prototypes, Manufacturing processes, Product design, Industrial design, Manufactures, Technology, and Case studies
Current research by the developers of rapid prototyping systems is generally focused on improvements in cost, speed and materials to create truly economic and practical economic rapid manufacturing (RM) machines. In addition to being potentially smarter/faster/cheaper replacements for existing manufacturing technologies, the next generation of these machines will provide opportunities not only for the design and fabrication of products without traditional constraints but also for organizing manufacturing activities in new, innovative and previously undreamt of ways. This paper outlines a novel devolved manufacturing (DM) ‘factory-less’ approach to e-manufacturing, which integrates mass customization (MC) concepts, RM technologies and the communication opportunities of the Internet/World Wide Web, describes two case studies of different DM implementations and discusses the limitations and appropriateness of each, and, finally, draws some conclusions about the technical, manufacturing and business challenges involved. [ABSTRACT FROM AUTHOR]
The paper presents work on the development of a build-time estimator for rapid manufacturing. A time estimator is required to develop a comprehensive costing tool for rapid manufacturing. An empirical method was used to estimate build times using both simulated and actual builds for a laser sintering machine. The estimator presented herein is based upon object geometry and, therefore, the fundamental data driving the model are obtainable from current three-dimensional computer-aided design models. The aim is to define a model describing the build times for a laser sintering machine either for single or multiple objects. [ABSTRACT FROM AUTHOR]