Pearn, W.L., Sh Chung, Yang, M. H., and Shiao, K. P.
Journal of the Operational Research Society. May2008, Vol. 59 Issue 5, p637-651. 15p. 2 Diagrams, 6 Charts, 2 Graphs.
PRODUCTION scheduling, PRODUCTION engineering, INDUSTRIAL engineering, MANUFACTURING processes, RAPID prototyping, PRODUCTION control, SCHEDULING, SETUP time, and INDUSTRIAL arts
The multi-stage wafer probing scheduling problem (M-WPSP) with reentry is a practical variation of the parallel-machine scheduling problem. Since the M-WPSP involves multiple product families, to be processed on multiple stages, with various job due dates, ready times, reentry, serial and batch operations, sequential- dependent setup time, it is more difficult to solve than the classical parallel-machine scheduling problems. In this paper, we consider two strategies to solve the M-WPSP with reentry, where the total machine workload must be minimized. These two strategies incorporate a global planning mechanism, in advance, to determine the required stage due date of job at each process stage to prevent the due date problems occurring at the final stage. The sequential strategy schedules the jobs at the required stages according to the sequence of manufacturing process. The parallel strategy is designed specifically for the reentrant characteristic. To evaluate the efficiency of the proposed strategies, a set of test problems involving four critical factors, the product family ratio, the temperature-change consideration, the tightness of due dates, and the ready time, are designed to test the quality of solutions under two levels of workload. [ABSTRACT FROM AUTHOR]
MANUFACTURING processes, MACHINING, MANUFACTURES, RAPID prototyping, PRODUCTION methods, MANUFACTURING execution systems, INDUSTRIAL arts, INDUSTRIAL engineering, PRODUCTION engineering, QUALITY, MATERIALS analysis, EUCLID'S elements, and GEOMETRY
It is a fundamental requirement that during the design of a component, its manufacturability to the required quality at an acceptable cost must be ensured. In machining, achieving the required quality is ensured by performing all machining quality critical operations in a single setting-up. Paper outlines the basis for the manufacturability of a component to the required quality and cost while it is at the design stage through feature mapping. A comprehensive analysis of features in a feature based design system and manufacturing process (CNC milling) formed the basis of the mapping sequence to link the both classes of features. Once the manufacturing features of the component in question are mapped ensuring its accessibility and number of setting required can pave the way for ensuring that the above requirement is met. Design features whose geometry is difficult to machine and/or require many settings affecting quality require modification or reorientation. In essence introduces a tool for identifying the machining features present in a design feature model for individual machining set up. [ABSTRACT FROM AUTHOR]