Ankara : The Department of Industrial Engineering and the Institute of Engineering and Sciences of Bilkent University, 2001.Thesis (Master's) -- Bilkent University, 2001.Includes bibliographical references leaves 79-84In the literature, scheduling models ignore the unavailability of the cutting tools.
Tool management literature considers tool loading problem when tools change
due to part mix. In practice, tools are changed more often due to tool wear. The
studies on tool management issues consider machining conditions as constant
values. In fact, it is possible to change the processing time and tool usage rate of
a job by changing the machining conditions. However, the machining conditions,
such as cutting speed and feed rate e ect the processing time and usage rate of
the tool in opposite directions. Increasing the usage rates of jobs will lead to an
increase in number of tool switches. Processing times and number of tool switches
are two components of our ob jective function. This two-side e ect creates a tradeo
between processing time and tool usage rate. Therefore machining conditions
should be selected appropriately in order to minimize the total completion time.
We proposed a set of single-pass dispatching rules and a local search algorithm
to determine the machine conditions for each job and to schedule them on a single
CNC machine simultaneously to minimize the total completion time.Köylü, RabiaM.S