1.2.1 Basic Computer control functions
• NC part program storage
• Distribution of the part programs to the individual machine tools
- include post processing for specific machine formats
• Production control
- decisions of part mix, rates, inputs to parts of system
- considers data like,
- desired production rate for parts per day
- number of raw workparts available
- number of applicable pallets
- routes pallets to load/unload area
- gives instructions to operator about desired parts via a data entry unit (DEU)
• Traffic Control
- Regulates materials transfer system to ensure parts are moved between desired workstations. This may be problematic, depending upon the transportation system used. Can act like a railway switch operator.
• Shuttle Control
- moves parts between stations and main conveyor
- coordinates actions between machines, and primary handling system
• Work handling system monitoring,
- monitor both work parts, and pallets.
• Tool Control
- tracks tools at each station (and reroute parts if necessary, or notifies operator to install parts)
- tool life monitoring, and operator orders for replacement
• System performance monitoring and Reporting
- Generate management reports
1.2.2 Data Files Required in a FMS system,
• Part program file
- numerical control files for each part, and for each machine which may make a part
• Routing File
- A list of machines which the parts must be routed through for completion, including alternates in some cases.
• Part Production File
- Production parameters for each workpart
- production rates
- allowances for in-process inventory
- inspections required
- etc.
- used for production control
• Pallet reference file
- a record of which parts a specific pallet is fixtured for
- each pallet is individually identified
• Station Tool File
- a file for each workstation identifies,
- codes of cutting tools at station
- used for tool control purposes
• Tool-life file
- keeps tool-life value for each tool in the system for comparison with maximum value.
1.2.3 System reports generated by an FMS system,
• Utilization Reports
- summarize individual, and group efficiencies for stations.
• Production Reports
- daily and weekly reports of parts produced in the FMS
• Status Reports
- a snapshot of present conditions in the FMS system for,
- tools
- parts
- stations
- pallets
- etc
• Tool Reports
- list of tools at (or needed at) a workstation
- tool life status reports
• A Graphical Depiction of a Workstation Controller