Lean Inventory Management. (Kanban Inventory System)

Transcription

1 LEAN Training Training 9 LEAN Lean Inventory Management (Kanban Inventory System) HenryHenry FordFord Production ProductionSystem System

2 OU GOAL AND VISION KANBAN INVENTOY SYSTEM LEAN Training 9 Standardized inventories using a Pull system, Just-in-time inventories & Kanbans that will improve quality while reducing total cost

3 Definition of KANBAN LEAN Training 9 A KanBan card: Kan means color Ban means card used for inventory Visual Aid to assist inventory management High visibility for stock on hand Indicator for e Ordering of stock (paper, gloves, surgical equipment, etc) 3

4 Benefits of Lean Production LEAN Training 9 educe Inventory educe Storage Space Improve Quality Lower Total Cost Avoid Stock Outs Avoid Obsolescence 4

5 Kanban Cards LEAN Training 9 Kanban Card I st Generation Kanban Card II nd Generation 5

6 KANBAN FO ANY STOCK LEAN Training 9

7 Example Order Station LEAN Training 9 When an employee PULLS inventory with a Kanban card, the cards are placed at the order station Examples Include: Bins, Folders, Envelopes, Cubbies, Baskets, etc etc Need to be in high visibility areas Bins Wall Holders 7

8 LEAN Training 9

9 Example e Ordering Station Once item is ordered, the card is placed in the Ordered Kanban Station LEAN Training 9 Card remain there until order arrives, unless backordered Once the stock arrives, stock is rotated and Kanban Cards are placed at the re-order point e-order Station is at a different location than the Order Station 9

10 Kanban Example acks are alphabetical and shelves are numbered LEAN Training 9 Kanban cards It`s important to only PULL when you remove that product

11 Standardized Work Cell with Kanban Ordering Bins Kanban card in ordering bin LEAN Training 9

12 Savings: Hospital Lab LEAN Training 9 One Coagulation Analyzer eagents Inventory Factors: Excess inventory Obsolescence Calibration Quality Control Accidental Not so accidental loss Total Cost: $65,+ on Excess Inventory

13 Savings: Hospital Lab LEAN Training 9 Logistical Factors Cost to order Storage Transportation Transportation Fees $ spent on cabs monthly Total Cost: $,/year 3

14 Savings: Hospital Lab LEAN Training 9 Staff: $5/hour + benefits $75,/year % Lost time to inventory handling $75/year 3 4 Individuals handling inventory $3/year Yearly loss to inventory handling: = $8,

15 Value Creation With Lean Multiple Aspects Improved Quality LEAN Training 9 Increased Efficiency Savings educed Total Cost Continuous flow No stock-outs Avoid Obsolescence educed Storage Space and Equipment educed Motion moving Inventory to work area 5

16 Value Creation Savings Two Types of Savings: One Time Savings LEAN Training 9 Frees up capital with reduced inventory Perpetual Savings Saves the expenses to maintain inventory 6

17 USA Today Sept., 9 LEAN Training 9 When a CEO discovers Lean, watch out! 7

18 Inventory Management Calculations LEAN Training 9. How much to order? - Order Quantity. How much stock is required for variations? - Safety Stock 3. When to order? e-order Point (OP) or Kanban Position

19 Inventory Management Implementation Process Take stock of all inventory (Organize items by vendor, by department and by instruments) LEAN Training 9 Calculate average daily material usage (Demand) Calculate average delivery times for all items (Supply) Perform inventory calculations (Spreadsheet Provided) Train at least two people in each location to perform ordering function

20 LEAN Training 9 Inventory Model Excel Spreadsheet On Your equest

21 Inventory Calculations for Large Size Gloves Data: Average Demand (D)= box / day LEAN Training 9 Best Case Delivery time = 6 days Worse Case Delivery Time = 8 days Average delivery time (T) = (6+8)/= 7 days Calculating Order Quantity: Minimum Order Quantity = (D x T) = ( box per day) x (7 days) = 7 boxes Due to the manual ordering in the computer, HFHS decided to order every weeks. Actual order quantity = box per day x 4 days = 4 boxes

22 Inventory Calculations for Large Size Gloves Calculating Safety Stock (SS): Safety Stock (SS) = Material to protect for demand and supply fluctuations (7 days) = box per day x 7 days = 7 boxes LEAN Training 9 e Order Point (OP) and Kanban Card Position: Kanban Card Position = Material for Average Delivery time + Safety Stock = 7 boxes+7 boxes= 4 boxes

23 Max Stock Inventory eordering Example Kanban Card Position LEAN Training 9 eorder Pt Safety Stock Zero Stock Order Delivered eorder Pt. Order Submitted eorder Lead Time (Performance Cycle) Order Delivered Cont. Time

24 LEAN Training 9 Henry Ford Production System LEAN Training Henry Ford Production System Kanban Card! Inventory eplenishment 4 Inventory eplenishment Week Week4 Week3 Week Time (Days) Inventory Count (Boxes) Inventory Simulation for Large Size Gloves Average Demand = Box / Day Delivery Cycle = 7days Safety Stock = 7 boxes Order Qty = 4 Boxes eorder Point (Kanban Position ) = 4 boxes Safety Stock

25 LEAN Training 9 Henry Ford Production System LEAN Training Henry Ford Production System Kanban Card! Inventory eplenishment 4 Inventory eplenishment Week Week4 Week3 Week Time (Days) Inventory Count (Boxes) Inventory Simulation for Large Size Gloves Safety Stock

26 LEAN Training 9 Henry Ford Production System LEAN Training Henry Ford Production System Time (Days) Inventory Count (Boxes) Inventory eduction With Lean - Large Size Gloves Safety Stock Max. Inventory Before Lean Implementation (6 boxes) Max. Inventory After Lean Implementation (8 boxes) Waste - All Yellow Area

27 Tips for Inventory Management Planning Higher delivery variation => Increases safety stock Higher demand fluctuations => Increases safety stock LEAN Training 9 Ordering more often => Increases Ordering Cost Ordering too much material=> Increase inventory maintenance cost Ordering Frequency => Depends upon the technology that is being used for ordering Order Quantity => May affect economies of scale (EOS)

28 Take Home Lessons LEAN Training 9 Kanban involves all employees Kanban is a system that continuously supplies products You have what you need, where you need it, when you need it Have sufficient material at points of use Teams and individuals are encouraged to CONTINUOUSLY IMPOVE Support each other 8

29 Questions or Comments? LEAN Training 9 If you re interested in this inventory management approach Visit the lab and us for the spreadsheet