Papers by Author: An Hua Peng

Abstract: Abstracts: Fused deposition modeling (FDM), a representative prototyping technology with no use of toxic materials, has been widely used in offices. The reason of interlayer stress and warpage deformation are analyzed in this paper. Under certain conditions, the calculating formula of interlayer stress and the stress-distributing diagram in cut planes are provided, and the mathematical model for warpage deformation calculation is also established. Besides, the influence of the various process parameters on the deformation, such as the number of deposition layers, scanning line length, chamber temperature, and layer thickness, is quantitatively analyzed with measurements provided to minimize deformation.

Abstract: Abstract: Aiming at such performance indexes in fused deposition modeling (FDM) as dimensional error (DE) and warpage deformation (WD), and selecting four process parameters, wire-width compensation (A), extrusion velocity (B), filling velocity (C), and layer thickness (D), as controlling factors, this paper optimized the four process parameters by means of Taguchi method combined with fuzzy comprehensive evaluation. The optimization results show that the parameter with the most significant influence on the performance indexes is A, followed by B, D, and C, and that the optimum combination of the process parameters is A1B1C2D3.

Abstract: Abstract: Based on analyzing the influences of build direction on stair-stepping effect, supporting structure, efficiency, and deformation, etc., analytical hierarchical process (AHP) is introduced to make decision for build direction in layered manufacturing. The applications to optimizing the build direction of a computer mouse during prototyping show that the proposed method increases the rationality during decision making and improves quality and efficiency for the prototyping part.

Abstract: Improving part quality during rapid prototyping is the important problem. The part errors during rapid prototyping is classified in dimension error, shaped error and roughness of surface. The shaped errors have many forms in fused deposition modeling (FDM), largely including warpage deformation, stair-stepping effect, and so on. There are several reasons for the errors, including principle, process and equipment. The reasons inducing these errors are analyzed, and the measures improving part accuracy are proposed

Abstract: Parts precision is one of the key points in industrial application of rapid prototyping technology (RPT), and also the pivot of RPT research, but presently high precision is hard to achieve. This paper focuses the emphases on the principle of error analysis. Obtain chord errors corresponding to the number of triangles with pro/E software during the STL, and the formula for computing stair errors taking the quarter of sphere for an example during the slicing. In the end, propose the measures to improve the principled errors, viz. sloping slicing, adaptive slicing, direct slicing and so on, and further propose the theoretical range of adaptive slicing thickness.

Abstract: Plastic profile produced by extrusion die should be cooled down and calibrated by calibrator ,so the proper design of the cooling system in calibrator was very important to the profile quality .The cooling channels in calibrator were preliminarily designed according to target function, and peculiar heterotype optimum designs of the local cooling channels were carried out by means of numerical simulation , the cooling effect was improved obviously ,Based on enterprise resource planning ERP system and parallel project computer aided design/computer aided Engineering CAD/CAE intellectualized data-base network, design for the cooling system was more reasonable, and could meet the demands of customers much better.