An investigation of parting direction based on dexel model and fuzzy decision making

This paper presents a method for automatic mould parting direction selection in computer-aided design of moulds and dies. When given a three-dimensional CAD model, the minimum volume bounding box of the model is found first. Three pairs of possible parting directions are defined based on the bounding box surface normal vectors. They are in the length direction, the width direction and the height direction of the bounding box. Now, a dexel model is constructed along each parting direction. Parting lines corresponding to the three possible parting directions are estimated using a slice method. Finally, criteria such as undercut, draw, projected area and flatness in all parting directions are quantified using the dexel model of the part. A designer's preferences, coded as fuzzy weighting factors, are set-up for the evaluation of the most promising parting direction. Uncertainty that is assumed to be inherent in the assessments of the ratings and weights is accounted for by the proposed fuzzy heuristic.

[1]  K. C. Hui,et al.  Mould design with sweep operations - a heuristic search approach , 1992, Comput. Aided Des..

[2]  Sabine Stifter.  Simulation of NC machining based on the dexel model: A critical analysis , 1995 .

[3]  R. G. W. Pye.  Injection mould design (for thermoplastics) , 1968 .

[4]  Souran Manoochehri,et al.  Geometric Influence of a Molded Part on the Draw Direction Range and Parting Line Locations , 1996 .

[5]  W. Pedrycz,et al.  A fuzzy extension of Saaty's priority theory , 1983 .

[6]  Andrew Y. C. Nee,et al.  Automatic Determination of 3-D Parting Lines and Surfaces in Plastic Injection Mould Design , 1998 .

[7]  Li-Xin Wang,et al.  Adaptive fuzzy systems and control , 1994 .

[8]  F. S. Wong,et al.  Fuzzy weighted averages and implementation of the extension principle , 1987 .

[9]  Peter M. Will,et al.  Determining the Three-Dimensional Convex Hull of a Polyhedron , 1976, IBM J. Res. Dev..

[10]  Louis Thomas Manzione,et al.  Applications of Computer Aided Engineering in Injection Molding , 1988 .

[11]  in chief,et al.  Handbook of product design for manufacturing : a practical guide to low-cost production , 1986 .

[12]  B. Ravi,et al.  Decision criteria for computer-aided parting surface design , 1990, Comput. Aided Des..

[13]  Jun-Yong Lee,et al.  Application of fuzzy logic in computer-aided design of digital systems , 1996, Defense + Commercial Sensing.

[14]  鄺建華.  Computer-aided parting line and parting surface generation in mould design , 1992 .

[15]  Ralph R. Martin,et al.  Putting objects into boxes , 1988 .

[16]  Souran Manoochehri,et al.  Optimum parting line design of molded and cast parts for manufacturability , 1997 .