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Unformatted text preview: 4/25/2007 Industrial Data and Systems Analysis 1 Shop Floor Scheduling Peter L. Jackson School of Operations Research and Information Engineering Cornell University 4/25/2007 Industrial Data and Systems Analysis 2 Relation of Planning and Scheduling MRP system plans and releases jobs (production authorizations, PA) Job (or PA) specifies part number to produce, quantity to produce, release date, and due date MRP system might also authorize withdrawal (from inventory) of components needed by job Manufacturing system (shop floor) is responsible for completing the jobs 4/25/2007 Industrial Data and Systems Analysis 3 Traditional Shop Floor Scheduling Print out routing for job Routing is a list of the sequence of operations Each operation described by Operation number Workcenter (collection of machines) required Special instructions (tools, processes) Standard setup time, run time, teardown time Insert routing, engineering plans, and log sheet in plastic sleeve Physically attach routing packet to cart containing parts of job 4/25/2007 Industrial Data and Systems Analysis 4 Traditional (contd) Supervisor of workcenter surveys log sheets of carts in process Decides which jobs have highest priority Assigns jobs (next operation) to specific operators and machines Each operator signs log sheet after operation is completed Notes yield loss (quantity reduction) Material handling personnel check routing and log sheets to figure out next workcenter to transport cart to 4/25/2007 Industrial Data and Systems Analysis 5 Traditional (contd) Expediters use MRP system to discover jobs that are late Walk throughout factory to find the job Encourage supervisor of current workstation to give the job higher priority 4/25/2007 Industrial Data and Systems Analysis 6 Automated Shop Floor Scheduling Essentially the same functionality, but digital Routings Predicted times Engineering data (tools, processes) Supervisors to assign operations to machines Material handlers to authorize material transfer Expediters to monitor flow and change priorities Lights out factories Completely automated: material handling, parts loading and unloading (into machines), machining 4/25/2007 Industrial Data and Systems Analysis 7 Semi-Automated Shop Floor Scheduling A mix of traditional and computerized Most companies still fall in this category Combine power of computerized transaction processing with flexibility of human intervention Ex. Automobile assembly plants Mix of MRP, computerized scheduling, manual kanban, robotic welding, conveyors, automated storage and retrieval, human assemblers, vehicle drivers, automated guided vehicles 4/25/2007 Industrial Data and Systems Analysis 8 Different Paradigms Process industries Flow mentality: Units flow through a network Switches used to control flow...
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This note was uploaded on 01/09/2009 for the course ORIE 312 taught by Professor D.ruppert,p.jacks during the Spring '08 term at Cornell University (Engineering School).
- Spring '08