newgom3-supplementandexercise(存儲版)
【正文】 to be assembled on a conveyor belt. Five hundred wagons are required per day. Production time per day is 420 minutes, and the assembly steps and times for the wagon are given in the following Exhibit. Assignment: find the balance that minimizes the number of workstations, subject to cycle time and precedence constraints. TASK TASK TIME IN SECONDS DESCRIPTION TASKS THAT MUST PRECEDE A 45 Position rear axle support and hand fasten four screws to nuts. B 11 Insert rear axle A C 9 Tighten rear axle support screws to nuts B D 50 Position front axle assembly and hand fasten with four screws to nuts E 15 Tighten front axle assembly screws D F 12 Position rear wheel 1 and fasten hubcap. C G 12 Position rear wheel 2 and fasten hubcap. C H 12 Position front wheel 1 and fasten hubcap. E I 12 Position front wheel 2 and fasten hubcap. E J 8 Position wagon handle shaft on front axle assembly and hand fasten bolt and nut F, G, H, I K 9 Tighten bolt and nut J 195 1. Draw a Precedence Diagram. A B C F J D E H I G K 45 sec 50 sec 11 sec 15 sec 9 sec 12 sec 12 sec 12 sec 12 sec 8 sec 9 sec m in420sec60 ????? wagondayperoutput daypertimeproductionC )(sec195 upround edond sond sCTNt ????2. Determine workstation cycle time. Here we have to convert to seconds because Our task time are in seconds 3. Determine the theoretical minimum number of workstations required (the Actual number may be greater. A B C F J D E H I G K 45 sec 50 sec 11 sec 15 sec 9 sec 12 sec 12 sec 12 sec 12 sec 8 sec 9 sec WS1 WS2 WS3: B,E,C,F WS4: G,H,I,J WS5 %7777.))(5( 195 orNTE fficien cy ???TASK NUMBER OF FOLLOING TASKS A 6 B or D 5 C or E 4 F,G,H or I 2 J 1 K 0
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鄂ICP備17016276號-1