Flexible Manufacturing System (FMS)

2. Flexible Manufacturing System (FMS)

3. Flexibilities Machine Flexibility • Ease with which a machine can perform various operations with little time to switchover from one to another. Material Handling Flexibility • Ease with which parts can be transported from one machine to another with little travel time. Operation Flexibility - Ease with which alternate operations sequences can be used for processing a part with little change in time.

4. Flexibilities Volume Flexibility • Measure of system’s capability to adjust varying volumes and still being profitable. Expansion Flexibility • Measure system’s ability to be built and expanded with little investment. Routing Flexibility - Measure of alternate paths which a part can follow through a system for complete manufacturing.

5. Flexibilities Process Flexibility • Measure of system’s capability to process variety of different parts without any change in set up. Product Flexibility • Measure system’s capability to process variety of different parts with minimal set up. Program Flexibility - Measure the times to which the system can run unattended.

6. Flexibilities Production Flexibility • Measure of system’s capability to switchover another class of parts with little investment. Market Flexibility • Ability of a system to adapt to changing market conditions.

9. FMS Cell Formation

10. FMS Cell Formation

11. FMS Cell Formation

12. FMS Cell Formation

13. FMS Cell Formation

14. FMS Cell Formation

15. FMS Cell Formation

16. FMS Cell Formation

17. FMS Cell Formation

18. FMS Cell Formation

19. FMS Cell Formation

20. FMS Cell Formation

21. FMS Part Allocation Eight parts are being considered for an FMS cell. These parts are currently purchased from vendor. The cell will be available for 250 hours period. The table below gives current unit cost for each part type, raw material cost, demand rate and unit production time. The cell is charged at the rate of $50 /hour which includes all related expenses. Which parts should be added to the FMS cell. Part Type 1 2 3 4 5 6 7 8 Unit purchase price 200 155 300 125 300 86 93 165 Material cost 45 35 124 50 120 34 36 114 Demand 100 50 50 75 60 30 50 600 Processing time/unit 1.0 2.0 4.0 1.0 2.0 1.0 1.0 0.5 Unit Savings 105 20 -24 25 60 2 7 26 Hours 100 100 200 75 120 30 50 300 Savings 105 10 ---- 25 30 2 7 ----

22. Part Allocation: Knapsack Problem Total Time = 16 hours Objective Function: Maximize Subject to

23. FMS Part Assignment Consider the set of parts shown in table below. Three machines of type A and one machine of type B are available. Machines are set up once each day and are normally available for 12 hours per day. Both machines are capable of holding two tools. The initial letter in the tool name indicates the machine required. What should be produced today. Unit Processing Time Part Type Order Size Due date Machine A Machine B Tools a 5 0 0.1 0.3 A1, B2 b 10 1 1.2 0.0 A2 c 25 1 0.7 0.4 A3, B4 d 10 1 0.1 0.2 A1, B2 e 4 2 0.3 0.2 A5, B3 a 10 4 0.3 0.2 A1, B2

24. FMS Part Assignment Unit Processing Time Part Type Order Size Due date Machine A Machine B Tools a 5 0 0.1 0.3 A1, B2 b 10 1 1.2 0.0 A2 c 25 1 0.7 0.4 A3, B4 d 10 1 0.1 0.2 A1, B2 e 4 2 0.3 0.2 A5, B3 a 10 4 0.3 0.2 A1, B2 Step Assigned Parts Time Assigned Tools Assigned A B A B 1 a 0.5 1.5 A1 B2 2 a, b 12.5 1.5 A1, A2 B2 3 a, b, c 30.0 11.5 A1, A2, A3 B2, B4 4 a, b, c, d(2/10) 30.2 11.9 A1, A2, A3 B2, B4