Storage Systems Chapter 11 Storage System 1 Storage
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Storage Systems Chapter 11 Storage System 1
Storage System n n to store materials for a period time and permit access to those materials when required. Type of material 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Raw material Purchased parts Work in process Finished product Rework and scrap Refuse Tooling Spare parts Offices Supplies Plant records Storage System 2
Storage system performance n Various measure used to assess the performance of a storage system include: 1) Storage capacity 2) Density 3) Accessibility 4) Throughput 5) Utilization 6) Reliability (5) ��� (6) ������������� Storage System 3
Storage system performance n Storage capacity �������� 2 ��� 1. Total volumetric space available 2. Total number of storage compartment in the system ������� capacity ����������������� loads ����� Storage System 4
Storage system performance n System throughput ��������������� Receives and puts loads into storage and/or 2) Retrieves and delivers loads to the output station q Storage or Retrieval ����� 1) Pick up load at input station 2) Travel to storage location 3) Place load into storage location 4) Travel back to input station 1) Storage System 6
Storage location strategies n ��������� 2 ������� 1) Randomized storage; items ����������� storage system 2) Dedicate storage; ����������� item n ����������� Warehouse ������ “stock-keeping-unit (SKU)” Storage System 8
Storage location strategies n ������������ ��� 1) Item ����� part number ���� product number ���� 2) Item ����� Activity Level 3) Item ������� Activity to space ratios. ��� ratio �������������� item ����� ��� input/output station Storage System 9
Storage location strategies n Ex 11. 1 Suppose that a total of 50 SKUs must be stored in a storage system. For each SKU, average order quantity = 100 cartons, average depletion rate = 2 cartons/day. And safety stock level = 10 cartons. Each carton requires one storage location in the system. Based on this data, each SKU has an inventory cycle that lasts 50 days. Since there are 50 SKUs in all, management the scheduled incoming orders so that a different SKU arrives each day. Storage System 10
Storage location strategies n Ex 11. 1 (cont. ) Determine the number of storage locations required in the system under two alternative strategies: a) Randomized storage b) Dedicated storage System 11
Automated storage system n Mechanized and automated storage system q n ������������� Automation varies; less-automated systems q ����������� load ���� -���� , high automated ��������� Storage System 12
Automated storage/retrieval system n ������������ Storage System 13
Automated storage/retrieval system (AS/RS) n n n AS/RS ���������� ��������� Operations are totally automated ��������������������� warehouse ��� factory AS/RS ����� rack structure , storage/retrieval mechanism (S/R( Storage System 14
Automated storage/retrieval system Storage System 15
Automated storage/retrieval system (AS/RS) n Characteristic of AS/RS Feature Basic AS/RS Storage structure Rack system to support pallets or shelf system to support tote bins Motions Linear motion of S/R machine Storage/Retrieval operation S/R machine travels to compartments in rack structure Replication of storage capacity Multiple aisles, each consisting of rack structure and S/R macine Storage System 16
Unit Load Automated Storage & Retrieval Systems (AS/RS) Storage System 18
Unit load AS/RS Storage System 19
Deep-Lane AS/RS Storage System 21
Mini Load Automated Storage & Retrieval Systems (AS/RS) Storage System 23
Man-On-Board AS/RS Storage System 25
AS/RS types and applications n Vertical lift storage modules (VLSM) q q q q ������� Vertical lift storage systems ���� Vertical lift automated storage/retrieval systems (VL-AS/RS) ����� AS/RS ���������� ��� VL-AS/RS ����������� 10 ���� (30 ft) �������������������� ��������� load ��������������������������� Storage System 27
AS/RS types and applications n n n AS/RS ����� warehousing ��� distribution operation AS/RS ����� raw material ��� WIP ����������� 3 ������ q q q Unit load storage and handling Order picking WIP storage systems Storage System 28
AS/RS types and applications n Unit load storage q q n ���� Unite load AS/RS ��� Deep-Lane storage system ����� warehouse, distribution center ����� finish good Order picking q q ������������ unit load Miniload, man-on-board Storage System 29
AS/RS types and applications n WIP storage q ���� batch ��� job shop production q ����������� AS/RS ����� WIP n Buffer storage in production ����������� station �������� n Support of just-in-time delivery ������� part ���������������� � 30 Storage System
AS/RS types and applications n Kitting of parts for assembly q n Compatible with automatic identification system q n ��������� barcode Computer control and tracking of material q n ����������������������� ������������ Support of factory-wide automation q ������������ � 31 Storage System
Components and operating features of an AS/RS n 1. 2. AS/RS ����� Storage structure ����� rack framework ������� steel �������� load ����� AS/RS ������������� Storage modules ��������� The S/R machine ���� load ����������� load ������� P&D station Storage System 32
Components and operating features of an AS/RS n n n The carriage includes a shuttle mechanism ������ load ����������� Storage modules ���� unit load containers ���������� The pick-and-deposit station (P&D station) ������ load ������� AS/RS ��������� load/unload ����� , fork lift truck, conveyor ��� AGVs. Storage System 33
Carousel storage systems n n ����� series ��� bins ���� baskets �������� overhead chain conveyor Chain conveyor ���������� bins ��� load/unload station ����������������� load/unload station ������ bins ����� station Automated ����� mechanism �������� ��� load/unload station ����� carousel Storage System 34
Carousel storage systems Storage System 35
Carousel technology n n n ��������� welded steel ����������� oval rail system ��������� overhead system ���� floor-mounted system(������ bottom driven unit) ����� carousel storage system ��� manual call control ������� computer control. Storage System 36
Carousel Applications n 1) 2) ������� carousel ������ Storage and retrieval operations ����������� ������ “pick and load” Transport and accumulation ���� workstation ������� carousel ���������������� Storage System 37
Carousel Applications 3) 4) Work in process ������� carousel ����� electronics industry Unique applications ��������������� carousel ���� electrical testing of components ������� carousel ��������� item ������� testing ���������� Storage System 38
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