Tool allocation and machining conditions optimization for CNC machines

Article Abstract:

The problem of simultaneously making tool allocation and machining decisions under tool wear, tool availability, and tool replacing and loading time constraints was considered. Specifically, a new heuristic for the multiple operation case was developed based on an extension to the single machine operation problem. The heuristic, which may be refined to yield an exact solution, incorporates a cost measure to evaluate trade-offs between any conflicting decisions.

Research, Case studies, Technology application, Resource allocation, Machining

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Match-up scheduling under a machine breakdown

Article Abstract:

Machine shop disruptions create new conditions that may make a preplanned schedule useless. Thus, rescheduling options that integrate such dynamic possibilities must be prepared. Such a technique is shown to be effective for the reactive hierarchical scheduling approach (RHSA) where a modified flow shop structure is adapted for machine breakdowns using match-up scheduling. Schedule quality and stability are increased and less deviation is observed for RHSA.

Models

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Scheduling with tool changes to minimize total completion time: basic results and SPT performance

Article Abstract:

A single machine sequencing problem subject to tool wear is considered in a study, where the objective is to minimize the total completion time. The main focus is on the performance of the shortest processing time (SPT) list-scheduling heuristic, with theoretical worst-case bounds on SPT performance and a demonstration of its empirical behavior.

United States

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