Production Planning and Control Chapter 7 Production Planning Professor JIANG Zhibin Dr.GENG Na Department of Industrial Engineering Management Shanghai Jiao Tong University 上浒充通大粤
Production Planning and Control Professor JIANG Zhibin Dr.GENG Na Department of Industrial Engineering & Management Shanghai Jiao Tong University Chapter 7 Production Planning
图 Chapter 7 Production Planning Contents ·Introduction Master Production Scheduling (MPS) o Material Requirement Planning (MRP) ·Capacity Planning 。Improvement in MRP 上游充道大睾
Chapter 7 Production Planning Contents • Introduction • Master Production Scheduling (MPS) • Material Requirement Planning (MRP) • Capacity Planning • Improvement in MRP
Capacity Planning-Techniques(CPOF) CPOF(Capacity planning using overall planning factors)is relatively simple approach to rough-cut capacity planning; CPOF plans are usually stated in terms of weekly or monthly time periods and accordingly are revised as the firm changes the MPS. Standard or Planning factor(e.g. Historical data historical data of direct labor time/ end product end product unit) on shop load Cap.req.on Cap.Req.on MPS overall labor or individual work machine-hr center The procedure for COPF 上泽充鱼大粤
Capacity Planning – Techniques (CPOF) Standard or historical data of end product • CPOF(Capacity planning using overall planning factors) is relatively simple approach to rough-cut capacity planning; • CPOF plans are usually stated in terms of weekly or monthly time periods and accordingly are revised as the firm changes the MPS. Planning factor (e.g. direct labor time/ end product unit) MPS Cap. req. on overall labor or machine-hr Historical data on shop load Cap. Req. on individual work center The procedure for COPF
apacity Planning-Techniques(CPOF) Example Problem data Master production schedule (in units) Period End product 1 2 3 4 5 6 7 8 9 10 11 12 13 Total A 3333 33 40 40 40 30 30 30 37 37 37 37 457 B 17 17 17 13 13 13 25 25 25 27 27 27 27 273 Direct labor time per end product unit: End product Total direct labor in standard hours/unit A 0.95 hours B 1.85 hours Estimated CPOF in standard direct labors Period Work center 2 3 4 5 6 7 8 9 10 11 12 13 Total Total required62.8062.8062.8062.0562.0562.0574.7574.7574.7585.1085.1085.1085.10939.20 Total Cap.Req.inP1:(0.95*33)+(1.85*17)=62.8 上帝究道大姿
Capacity Planning – Techniques (CPOF) Example Problem data Estimated CPOF in standard direct labors Total Cap. Req. in P1: (0.95*33)+(1.85*17) = 62.8 End product 1 2 3 4 5 6 7 8 9 10 11 12 13 Total A 33 33 33 40 40 40 30 30 30 37 37 37 37 457 B 17 17 17 13 13 13 25 25 25 27 27 27 27 273 End product A 0.95 hours B 1.85 hours Master production schedule (in units) Period Direct labor time per end product unit: Total direct labor in standard hours/unit 1 2 3 4 5 6 7 8 9 10 11 12 13 Total 62.80 62.80 62.80 62.05 62.05 62.05 74.75 74.75 74.75 85.10 85.10 85.10 85.10 939.20 Period Total required Work center
apacity Planning-Techniques(CPOF) Example Problem data Master production schedule (in units) Period End product 1 2 3 5 6 7 8 9 10 11 12 13 Total A 33 33 33 40 40 40 30 30 30 37 37 37 37 457 B 17 17 17 13 13 13 25 25 25 27 27 27 27 273 Direct labor time per end product unit: End product Total direct labor in standard hours/unit A 0.95 hours B 1.85 hours Estimated CPOF in standard direct labors Period Work Historical 3 4 5 6 7 9 10 11 12 13 Total center percentage 100 60.3 37.87 37.87 37.87 37.42 37.42 37.42 45.07 45.07 45.07 51.32 51.32 51.32 51.32 566.34 200 30.4 19.09 1909 19.0918.86 18.86 18.86 22.72 22.72 22.72 25.87 25.87 25.87 25.87285.52 300 9.3 5.84 5.84 5.84 5.77 5.77 5.77 6.95 6.95 6.95 7.91 7.91 7.91 7.91 87.35 Total required capacit 62.80 62.80 62.80 62.0562.05 62.0574.7574.75 74.7585.1085.10 85.1085.10939.20 Cap Req.for WC100inP1:62.8*60.3%=37.87 上泽充道大姿
Capacity Planning – Techniques (CPOF) Example Problem data Estimated CPOF in standard direct labors Cap Req. for WC 100 in P1: 62.8*60.3%=37.87 End product 1 2 3 4 5 6 7 8 9 10 11 12 13 Total A 33 33 33 40 40 40 30 30 30 37 37 37 37 457 B 17 17 17 13 13 13 25 25 25 27 27 27 27 273 End product A 0.95 hours B 1.85 hours Master production schedule (in units) Period Direct labor time per end product unit: Total direct labor in standard hours/unit Work center Historical percentage 1 2 3 4 5 6 7 8 9 10 11 12 13 Total 100 60.3 37.87 37.87 37.87 37.42 37.42 37.42 45.07 45.07 45.07 51.32 51.32 51.32 51.32 566.34 200 30.4 19.09 19.09 19.09 18.86 18.86 18.86 22.72 22.72 22.72 25.87 25.87 25.87 25.87 285.52 300 9.3 5.84 5.84 5.84 5.77 5.77 5.77 6.95 6.95 6.95 7.91 7.91 7.91 7.91 87.35 62.80 62.80 62.80 62.05 62.05 62.05 74.75 74.75 74.75 85.10 85.10 85.10 85.10 939.20 Period Total required capacit y