FLEXIBLE MANUFACTURING SYSTEMS. FLEXIBLE MANUFACTURING SYSTEMS MODELING AND ANALYSIS OF MANUFACTURING SYSTEMS.

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Presentation transcript:

FLEXIBLE MANUFACTURING SYSTEMS

FLEXIBLE MANUFACTURING SYSTEMS MODELING AND ANALYSIS OF MANUFACTURING SYSTEMS

DEFINITION A FLEXIBLE MANUFACTURING SYSTEM ( FMS ) IS A SET OF NUMERICALLY CONTROLLED MACHINE TOOLS AND SUPPORTING WORKSTATIONS CONNECTED BY AN AUTOMATED MATERIAL HANDLING SYSTEM AND CONTROLLED BY A CENTRAL COMPUTER A FLEXIBLE MANUFACTURING SYSTEM ( FMS ) IS A SET OF NUMERICALLY CONTROLLED MACHINE TOOLS AND SUPPORTING WORKSTATIONS CONNECTED BY AN AUTOMATED MATERIAL HANDLING SYSTEM AND CONTROLLED BY A CENTRAL COMPUTER

ELEMENTS OF FMS ► AUTOMATICALLY REPROGRAMMABLE MACHINES. ► AUTOMATED TOOL DELIVERY AND CHANGING ► AUTOMATED MATERIAL HANDLING ► COORDINATED CONTROL

FMS FEATURES ► MANY PART TYPES CAN BE LOADED ► PARTS CAN ARRIVE AT MACHINES IN ANY SEQUENCE ► PARTS IDENTIFIED BY CODES ► MANY MACHINES CAN BE INCLUDED ► SMALL FMS LEAD TO FLEXIBLE CELLS

► EXPENSIVE TO IMPLEMENT BUT SAVINGS CAN BE SIGNIFICANT ► FLOOR SPACE REDUCIBLE BY 1/3 ► EQUIPMENT UTILIZATION UP TO 85% OR MORE ► DETAILED PRODUCTION SEQUENCE NOT NEEDED WELL IN ADVANCE

MANUFACTURING FLEXIBILITY ► BASIC  MACHINE (VARIETY OF OPERATIONS)  MATERIAL HANDLING (PART MOBILITY AND PLACEMENT)  OPERATION (VARIETY OF OPERATIONS PRODUCING SAME PART FEATURES)

► SYSTEM  PROCESS (VARIETY OF PARTS PRODUCIBLE WITH SAME SETUP)  ROUTING (ABILITY TO USE DIFFERENT MACHINES UNDER SAME SETUP)  PRODUCT (CHANGEOVER)  VOLUME (PRODUCTION LEVEL)  EXPANSION (ADDED CAPACITY)

► AGGREGATED  PROGRAM (UNATTENDED RUNNING)  PRODUCTION (RANGES OF PARTS, PRODUCTS, PROCESSES, VOLUME, EXPANSION)  MARKET (COMBINATION OF PRODUCT, PROCESS, VOLUME AND EXPANSION)

COMMENTS THE PART TYPES ASSIGNED TO THE FMS SHOULD HAVE SUFFICIENT PRODUCTION VOLUMES TO MAKE AUTOMATION ATTRACTIVE BUT INSUFFICIENT TO JUSTIFY DEDICATED PRODUCTION LINES THE PART TYPES ASSIGNED TO THE FMS SHOULD HAVE SUFFICIENT PRODUCTION VOLUMES TO MAKE AUTOMATION ATTRACTIVE BUT INSUFFICIENT TO JUSTIFY DEDICATED PRODUCTION LINES

ORIGINS OF FMS ► LINK LINES (1960’S) ► NC MACHINES AND CONVEYORS ► BATCH PROCESSING

FMS PRIORITIES ► MEETING DUE DATES ► MAXIMIZING MACHINE UTILIZATION ► MINIMIZE THROUGHPUT TIMES ► MINIMIZE WIP LEVELS

FMS COMPONENTS ► MACHINES ► PART MOVEMENT SYSTEMS ► SUPPORTING WORKSTATIONS ► SYSTEM CONTROLLER

MACHINES ► PRISMATIC VS ROTATIONAL PARTS ► HORIZONTAL MACHINING CENTERS (HMC) AND HEAD INDEXERS (HI) ► TOOL MAGAZINES AND AUTOMATIC TOOL CHANGERS

PART MOVEMENT ► CONVEYORS ► TOW CARTS ► RAIL CARTS

SUPPORTING WORKSTATIONS ► LOAD/UNLOAD STATIONS ► AUTOMATIC PART WASHERS ► COORDINATE MEASURING MACHINES

CONTROLLER ► COMPUTER ► WORKER (ATTENDANT) ► TRACKING SYSTEM FOR  PARTS  MACHINES

COMPONENTS OF THE MANUFACTURING FACILITY  FACILITY  SHOP  CELL  WORKSTATION  EQUIPMENT

BASIC STEPS IN DECISION HIERARCHY ► LONG TERM PLANNING OR SYSTEM DESIGN (PART TYPES & EQUIPMENT SELECTION) ► MEDIUM RANGE PLANNING OR SETUP (DAILY DECISIONS ABOUT PARTS & TOOLING) ► SHORT TERM OPERATION (SCHEDULING & CONTROL)

SYSTEM DESIGN ► PROBLEM: SELECTING SYSTEM SIZE, HARDWARE, SOFTWARE AND PARTS FOR THE FMS ► SIZE & SCOPE ARE SELECTED ACCORDING TO CORPORATE STRATEGY ► HARDWARE & SOFTWARE SELECTED TO FIT SCOPE

SCHEDULING AND CONTROL ► BASIC PROBLEM AREAS  SEQUENCING AND TIMING OF PART RELEASES TO THE SYSTEM  SETTING OF INTERNAL PRIORITIES IN THE SYSTEM  ABILITY OF SYSTEM TO TAKE CORRECTIVE ACTION WHEN COMPONENTS FAIL

Flexible Assembly Systems ► For the combination of raw materials and components into products with functional characteristics. ► Automated vs manned systems ► Example: Vibratory bowl feeders and vision systems ► Role of Design for Assembly

FLEXIBLE MANUFACTURING SYSTEMS …Thank you…