Wafer manufacfurers usiiallyface critical problems when making decisions regarding to the tool portfolio elimination, mainly due to the dramatic and frequent influences from their internal and external environments. This paper is aimed to develop a mechanism, named Tool Portfolio Elimination Mechanism (TPEM), to evaluate the impacts on production performance and capital expenditure. and to determine which equipment is suitable for pruning. In TPEM, there are four stages to decide tool porlfolio elimination according to the PDCA cycle. Meanwhile, the simulation results show that the fab production performance and cost are much improved by the TPEM algorithm. Especially, it can be applied and implemented to industry vevy quickly and easily.
Adaptive control in machining systems leads to an increased production rate as well as tool breakage prevention.Nevertheless, most achievements in adaptive control for cutting processes are limited to laboratory environments; they are seldom to be implemented directly in CNC machines. By decoupling the whole machining system into the time-invariant servo system and the time-varying cutting process, this paper presents a systematic approach to realize self-tuning control in a personal computer along with the CNC conmller successfully. In this paper, satisfactory experimental results have proven that this developed technique is feasible for manufacturing industry.
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