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MRP 1

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Title: MRP Author: Mike Wu Last modified by: Mike Wu Created Date: 3/4/2007 3:07:04 AM Document presentation format: Company: CJCU Other titles – PowerPoint PPT presentation

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Title: MRP 1


1
Material Requirement Planning (MRP)
  • ? (?)?????

2
Outline
  • ?????????
  • MRP??
  • ?????????
  • BOM
  • Lead Time
  • Reorder Point (ROP)????
  • Safety Stock????
  • ?????Economic Order Quantity (EOQ)

3
MRP Definition
  • The planning of components based on the demand
    for high-level assemblies.
  • American Society for Production and Inventory
    Control (APICS)
  • ??????????

4
??????
  • ??????(MRP)??????????.
  • ??????(MRP II)?????????.
  • ??????(ERP)??????(?????)?????

5
MRP
6
MRP
7
MRP????
  • ?????(Mater Production Scheduling
    MPS)????????????.
  • ???(Bill of Material BOM)???????(product
    structure)???????????.
  • ???? (Inventory)???(on-hand),???(scheduled
    receipt),???(allocated).
  • ??????,????,????,????,?????.
  • ??????(time bucket)?????????????,???????(00-99)??
    ??????(000-999).

8
(No Transcript)
9
(No Transcript)
10
BOM??
11
BOM??
12
Order model of control??????
  • Sales??
  • ??????????????????
  • Purchase??
  • ??????????????????
  • Works?? Manufacturing order????
  • ?????????????

13
Order model of control??????
(????)
14
When should order be launched??????
  • Reorder Point (ROP)???????????????????????

???? ???? ????? ????
15
Reorder Point (ROP)???????
  • Orders arrive late.?????
  • Material consumed discontinuously.???????
  • The value of average demand does not represent
    future consumption.?????????????????

16
(No Transcript)
17
Safety Stock????
  • To buffer the planning system to against
    uncertainty in demand??????????

??? ??? ?????
18
Forecast Errors????
19
??????1-???
20
??????12
21
???????????
22
?????Economic Order Quantity (EOQ)
??????
  • ????????????
  • ?????
  • ??????
  • ????
  • ????
  • ?????

23
EOQ?????
24
Service level
25
???????
  • ????(Independent demand)
  • ????????????????????????,?????????????????????????
    ?????
  • ????(Dependent demand)
  • ?????????????????????,????????(parent
    item),????????(component item)?

26
???????
  • ?????????????????,?????????????????????.
  • ??????????????????????????.

27
?????
  • Cost represents a small portion of total value
    of assembly????
  • Volume used in large quantities???
  • Commonality used on several different
    assemblies???
  • Non-critical alternative items can be used???
  • Availability available from a variety of sources
    at short notice???

28
Pareto curve for components in an assemblies
80-20??
29
MRP??
30
MRP??(?)
31
Homework 1
  • ???????????????,???????,?????????(Bill of
    Material BOM)??????(product structure) ,??8?11?
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