LEAN ENGINEERING BY J T. BLACK DON PHILLIPS
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1 LEAN ENGINEERING BY J T. BLACK DON PHILLIPS
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3 LEAN ENGINEERING Mixed Model Final Assembly (Flexibility) Lean to Green Sub Assembly Cell (Flexibility) Cellular Mfg./ Standard work Setup Reduction/ SMED Integrated Quality/ 6 / 7 tools Integrated PM / TPM Value Stream Mapping Kanban (Inventory & Production control) Continuous Improvement (KAIZEN) Elimination of Waste
4 THE LEAN ENGINEER Lean Engineers make things cheaper, better, faster, in a green, flexible way Lean Tools Mfg.Cells VSM 5S SMED TPM MMFA Zero Defects Six Sigma Tools DOE/ Taguchi Gage R&R Reliability QFD Green Engineering Tools Environmental Design Risk Analysis Energy Efficient Design Social Design Remanufacturing Industrial Engineering Tools Probability & Statistics Production Control TQM Ergonomics Operations Research Supply Chain Management TPM Human Factors System Simulation System of Systems Time & Motion Study
5 LEAN ENGINEERING The Lean Engineer (LE), has an IE foundation, enhanced with lean tools, six sigma capability and a lean to green outlook to take the plant to zero waste going to the landfill. In his (or her) drive to remove waste from the system, the lean engineer s tool box is filled as follows: The design of a mixed model final assembly line to level demand on the supply chain. The design of subassembly cells using rabbit chase, sub-cells or TSS to eliminate conveyer lines and line balancing. The design of manufacturing cells using existing equipment to eliminate the job shop s functional design. The design of quick change work holder and cutting tool holders for the manufacturing cells. The integration of quality tools and defect prevention devices, in-line inspection devices, including poka-yokes and decouplers.
6 LEAN ENGINEERING CONT The integration of safety devices, walk away switches, automatic unload mechanisms and ergonomic improvements. The development of one piece flow processes for operations like painting and heat treatment and inspection. The development of machine tools for true lean manufacturing cells, design and built for the manufacturing cells. The last step requires lots of creativity and innovation to design and build and implement machine tools for the cells with narrow footprints, rapid tool and work holder exchanges, in-process inspection, rapid unload and load for one-piece flow, good ergo and safety features and one-piece flow operation built around standard work.
7 LEAN ENGINEERING IN ACADEMICS While many IE programs have neglected the lean engineering material and stuck with efforts to optimize the mass production system or parts thereof, over 60% of the manufacturing industries have implemented lean manufacturing.
8 DESIGN OF THE FACTORY WITH A FUTURE By designing and implementing this new manufacturing system (factory) design Toyota Motor Company has become the world leader in the automotive industry. The final assembly line in the mass production system is changed into a mixed model final assembly lines, with conveyers, are redesigned into manufacturing cells. Final assembly operates with a Takt Time, and the cells are redesigned into manufacturing cells. Final assembly operates with a Takt Time and to operate on a Make One Check one Move One On (MO CO MOO) basis. Single cycle machine tools are used with built-in devices to check parts (poka-yokes). Between the machines are devices (decouplers) designed to assist standing, walking workers producing the parts in the manufacturing cells.
9 THE NEW INDUSTRIAL ENGINEER When the Toyota Motor Company and Taiichi Ohno invented the Toyota Production System, they also redefined the profession of industrial engineering which grew up and flourished with the mass production system. This new engineer, a lean engineer, must be able to design a mixed model final assembly lines for zero defects, design of manufacturing and subassembly cells for one-piece flow, design of tooling (work holding and cutting tools) for rapid changeovers, and implement (pull) production/inventory control system called kanban), all part of the design of the lean manufacturing system.
10 DESIGN RULES FOR L-CMS TT=Hr s Available in Day/ DD ; where DD is the daily demand DD = (No. of cars/month)/(no. of days in Month) Note PR = Production Rate for final assembly = 1/TT MO C0 MOO (one piece flow with defect prevention) SMED Rules: A methodology for rapid tool and die change MT ij < NCT, where NCT TT (1- allowance) K = (DD L + SS) / s (Little s Law, operational Form)
11 MASS PRODUCTION VS LEAN PRODUCTION
12 A BRIEF HISTORY OF FACTORY DESIGNS
13 EARLY FACTORIES
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15 GOING LEAN Industry Segment Industrial equipment 61% 65% Food and beverage 45% 52% Metal Fabrication 68% 68% Transportation Equipment 42% 70% Building materials 51% 55% Plastics 65% 64% Electronics 61% 67% Chemicals 55% 59% Printing, publishing 55% 51% Medical devices 61% 87% Total 56% 61%
16 LEAN ENGINEER CORE COMPETENCY The Lean Engineer is an IE who knows Lean Manufacturing, has six sigma capabilities with a green (zero waste) mentality LEAN TOOLS Value stream mapping Cellular manufacturing JIT/Total quality control Teams Kanban (pull) and supply chain organization Environmentally sound Leveling, Balancing, Sequencing 5S and 5 why methods Autonomation (jidoka) Pokayokes and defect prevention Waste Elimination (7 wastes) Total Productive Maintenance (TPM) One-piece flow (Single-piece flow) Standard work Zero waste to landfill Visual management Self and serial inspection Leveling final assembly Takt time (cycle time for final assembly) Line side storage (POUS) Kaizen events for continuous improvement SIX SIGMA TOOLS Green belt requirements Performance measurements/metrics Problem solving Process capability analysis Hypothesis testing Design of Experiments Gage R&R Reliability ISO 9000 & MBNQA Quality Function Deployment Regression analysis Root cause analysis Variation reduction 7 Quality tools - Process mapping - Check sheets - Pareto analysis - Cause and effect diagram analysis - Scatter diagrams - Histograms and frequency diagrams - Variables and attributes control charts with Process capability analysis IE Foundation Process mapping; Production and Inventory control; Quality control; Engineering Economics; Operations Research; Simulation Methods; Human Factors; Ergonomics; Probability and Statistics; Manufacturing Processes.
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20 DESIGN OF A MODERN JOB SHOP
21 LINKED CELL MANUFACTURING SYSTEM
22 LAYOUT OF A RACK MANUFACTURING CELL
23 STANDARD WORK SHEET FOR RACK MANUFACTURING CELL
24 MACHINE TOOL DESIGN FOR JOB SHOP & LEAN MANUFACTURING CELL
25 ERGONOMICS LEAN PRODUCTION MANUFACTURING CELL ERGONOMIC ADAVANTAGES Less Muscular Fatigue - CMS standing, walking worker - Venous pooling - Better circulation - Lower heart rates Less CTD Hazards - Non-repetitive movements - Forces exerted - Better posture
26 ERGONOMICS LEAN PRODUCTION MANUFACTURING CELL ERGONOMIC ADAVANTAGES CONT Better Man/Machine Interface - Adjustable height workstation - Controls/Displays compatibility - Scientific designed tools - Self aligning - EZ access - Self inspection Better Interface With System - Streamlined parts flow - More frequent moves - Minimal twisting - Minimal lot size
27 ADVANTAGES OF HOME-BUILT EQUIPMENT Only company with this unique process technology. Process technology built to overall system specifications Competitors cannot get access to the technology from machine tool vendors Only need to build the necessary features into the machines to make the family of parts Processes and cell designed and built with flexibility in mind so that it can adapt to changes in product design (both existing product and new products) and customer demand.
28 ADVANTAGES OF HOME-BUILT EQUIPMENT CONT Equipment is designed for (all of these) standing, walking workers (right height, narrow footprint) ergonomical considerations Easy load/unload ergonomically designed Easy maintenance, easy to clean, easy to repair preventive maintenance considerations Easy to use (operate) ergonomically correct Easy to rearrange (wheels, quick-connect utilities) L - CMS flexibility Easy to change tools (automatic tool changers) Easy to change work holders (rapid setup) modular fixturing leading to rapid changeover of existing products Reliability and durability The equipment (and methods) are designed to prevent accidents (a failsafe design) and not to produce defective parts (pokayoke).
29 MANUFACTURING CELL DESIGN
30 PART DRAWING SEQUENCE OF OPERATIONS
31 SHOP LAYOUT - PATH
32 CELL LAYOUT
33 MANNED INTERIM MANUFACTURING CELL WITH TWO WORKERS
34 EXAMPLE SINGLE CYCLE AUTOMATICS
35 DECOUPLER
36 EXAMPLE PROCESS DELAY DECOUPLER
37 SINGLE MINUTE EXCHANGE OF DIES
38 EXAMPLE ONE TOUCH EXCHANGE OF DIES
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40 THE AUTOMATION STEPS FOR MACHINE TOOLS LIST DEVELOPED BY M.BAUDIN AND J T. BLACK Early on, Toyota engineers devised a list of steps to follow in sequence to successfully automate a machining process. Today machine tools (CNCs) are so automated that this list is no longer applicable but in many machine shops are still far away from Toyota s level. This list developed empirically by Toyota engineers as a result of carrying out many projects. The progression has to do with the tasks carried out by operators in the manufacturing cells 1. Add power drives to manual operations (A1). Except for occasional hand tapping, very few operations in today's machine shops utilize cuts actually powered by the human hand.
41 THE AUTOMATION STEPS FOR MACHINE TOOLS LIST DEVELOPED BY M.BAUDIN AND J T. BLACK 2. Add power feed to manual feed (A2). Conventional machines with automatic feed mechanisms did not have any stopping mechanism, required an operator to prevent cutting from farther than it should 3. Add on automatic stop and return to start position (A3). The third step is the enabler for cell operations in which an operator concurrently serves several machines. The operator can press a walk-away switch to start the cycle. The machine may make several cuts, for each of which the operator needs to press Start, or it can automatically sequence cuts, so that the operator only presses Start once. Either way, the operator does not need to stay and watch the machine during cuts. This is the MO- CO-MOO level using single cycle automatics.
42 THE AUTOMATION STEPS FOR MACHINE TOOLS LIST DEVELOPED BY M.BAUDIN AND J T. BLACK 4. Add automatic unloading. Automatic unloading is easier than automatic loading because it does not require precise positioning of the part with respect to the tool. The simultaneous automation of unloading and loading results in using more expensive methods than necessary for unloading. This step is the enabler for chaku-chaku lines also called decouplers. As part of routing operation in the cell, the operator loads the next part and checks for the one just unloaded, unless it is checked in the decoupler. 5. Add automatic loading. While automatic loading, the role of the operator in the manufacturing cell is further augmented to checking parts and conveying them between machines. The machine continually loads the next part and starts cutting without human intervention. The operator, however, still plays an additional role in excepting handling, including responding to stoppages, replacing broken or worn tools, or calling maintenance in case of major failures.
43 THE AUTOMATION STEPS FOR MACHINE TOOLS LIST DEVELOPED BY M.BAUDIN AND J T. BLACK 6. Add automatic problem detection. The next stage is to eliminate the operator s exception handling role. As long as the operator relies on noise, smell, the sight of smoke, or the feeling of vibrations to detect when something is wrong, he or she must stay close enough to the machine and pay attention at all times. If the machine is equipped with sensors and an alarm system that alerts the operator to the problem clearly, then the operators role is reduced to transportation. 7. Add automatic transportation. The final steps has machines in a cell linked with chutes, decouplers, small conveyors or, in some cases, robots; and parts of the cell or line work unattended. Lines of stamping presses, machine transfer lines, or what the CIM literature calls Flexible Manufacturing Cells (FMCO are at this level)
44 MANUFACTURING CELL WITH TRANSFER LINE
45 STANDARD WORK IS COMPRISED OF THREE ELEMENTS Cycle Time (based on Takt time) Sequence of operations Stock on Hand (inventory in the cell) THESE ELEMENTS ARE DETERMINED BY CONSTRUCTING THE FOLLOWING DOCUMENTS IN THE FOLLOWING ORDER: Table of Production capacity by process Standard Operations Routine Sheet Cell Design
46 CONSTRUCTING A MANUFACTURING CELL EXAMPLE MASTER CYLINDER MACHINING PROCESS D130 L210 M110 RM T420 Inspection FG Manufacturing Cell Design OTHER INFORMATION: Tools on machine L110 are changed in 60 seconds every 100 pieces. Tools on machine L210 are changed in 50 seconds every 200 pieces. Tools on machine D310 are changed in 100 seconds every 300 pieces. Tools on machine L110 are changed in 30 seconds every 400 pieces. 2 seconds walk time between all operations. 2 Seconds manual time to pick up raw material and store finished goods.
47 OPERATION NUMBER CONSTRUCTING A MANUFACTURING CELL EXAMPLE MASTER CYLINDER MACHINING PROCESS PART NUMBER: 1234M56G78 REGULAR WORKDAY: 460 MINUTES NAME: MASTER CYLINDER REQUIRED DAILY OUTPUT: 690 OPERATION NAME MACHINE MANUAL NUMBER TIME Pick up Raw Material Cut mounting surface Surface Cut O.D. Drill Hole Thread Check Thread Diameter Put down finished product - M110 L210 D310 T420 INSP MT MACHINING TIME WALK TIME 26 sec 14 sec Cycle time CT = = 40 sec. All machining times less than cycle time
48 OPERATION O30 Drilling 2 inch diameter hole Machining Time = Length of cut/ Feed Rate (in/min) Feed Rate = Drill RPM Drill feed per revolution Drill RPM = (12 Cutting Speed)/( Drill Diameter) For Operation O30, Tool Material Indexable Insert Work Material Cast Iron Select Cutting Speed = 200 sfpm Feed Rate = ipr Drill RPM = (12 200)/ ( 2) = 382 rpm Feed Rate = = 3.82 ipm MT = (L + All)/(Feed Rate) = ( )/3.82 = 0.45 min = 27 sec
49 EXAMPLE STANDARD OPERATIONS ROUTINE SHEET
50 OPERATION 2 CD-300 CENTER DRILL Drilling Hole in Part 3 inch diameter hole Machining Time = (Length of cut + Allowance)/ Feed Rate (in/min) Feed Rate (ipm) = Drill RPM Drill Feed (ipr) Drill RPM = (12 cutting speed) / ( Drill Diameter) For Operation 2, Tool Material Spade Drill HSS Work Material Steel, Annealed Select Cutting Speed = 60 sfpm Feed Rate = ipr Drill RPM = (12 200) /( 2) = rpm Feed Rate = = 2.29 ipm MT = (L + All)/Feed Rate = ( )/2.29 = 1 20 = 80 sec
51 SUB-ASSEMBLY CELLS
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54 LEAN PRODUCTION REQUIRES Redesign of final assembly into mixed model to level the demand on the supply chain Redesign of the subassembly cell into flexible U-shaped cells Redesign of the job shop into manufacturing cells Significant reduction in defect rates, setup times and equipment failures (7 tools; 6 ; SMED; TPM) Focus on labor driven systems and not capacity driven systems Minimum WIP systems to support maximum flexibility, minimum throughput time, minimum labor, and maximum output rates Pull versus push production strategies (Kanban Systems) A relentless and never ending drive to eliminate all forms if waste and variance in the system (5S)
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56 FIVE DESIGN RULES FOR LEAN PRODUCTION TAKT TIME RULE ONE PIECE FLOW RULE CELL DESIGN RULE SMED RULES KANBAN RULES
57 IN THE L-CMS UNDERSTANDING THESE DESIGN RULES IS TO UNDERSTAND HOW THE SYSTEM IS DESIGNED AND WORKS RULE 1 TT =HR s Available in a Day/ DD, where DD = (No. of. Cars/Month)/(No. of Days in Month) Note: PR = Production Rate = 1/TT RULE 2 MO-CO-MOO (OPF with defect prevention) RULE 3 MT ij < NCT where NCT TT (1 allowance) NCT = Necessary Cycle Time RULE 4 SMED Rules and Methodology RULE 5 K = (DD L + SS)/ a (Little s Law Operational version)
58 RULE 1 TAKT TIME RULE Level & Balance the manufacturing system make final assembly mixed model cells produce the daily demand. Sequence and Synchronize. The lean production system depends upon smoothing the manufacturing system (Toyota s terminology). In order to eliminate variation or fluctuation in quantities in the supply chain, it is necessary to eliminate fluctuation in the final assembly by MMFA. DD =average daily demand for parts = Monthly demand (forecast plus customer orders) Number of days in each month PR = Average daily demand (parts)/shift Available hours/shift = DD Hrs/day = parts minute TT = 1/production rate for final assembly (FA) = 1/PR TT = Available hours/shift Available DD/shift = TAKT TIME for final assembly
59 RULE 2 ONE PIECE FLOW RULE Make the subassembly lines into U-shaped manufacturing cells that operate like final assembly with OPF. MO-CO-MOO = Make One Check One Move One On with output a linear function of the Number of Operators in a cell. 450 OUTPUT PER HOUR NO DEFECTS ALLOWED TO ADVANCE NO. OF WORKERS
60 RULE 3 LEAN SHOP RULE MT ij < NCT (Necessary Cycle Time) where NCT = TT (1 allowance) and MT ij = machining time i = no. of products in family j = no. of SCA s in cell THE MACHINE TOOLS ARE SINGLE CYCLE AUTOMATICS (SCA S)
61 RULE 4 SMED (SHINGO) 1. Determine what us happening now video the setup 2. Separate the Internal from External elements 3. Shift Internal to External 4. Eliminate Adjustments
62 LITTLE S LAW Little s Law states a mathematical relationship between throughput rate, throughput time, and the amount of work-in-process inventory. Little s Law is useful for estimating the time that an item will spend in work-in-process inventory, time for a process. Using the terminology defined in this section, Little s Law is defined as follows: Throughput time = Work in - process Throughput rate ; TPT = WIP PR Parts/Day Kanban Design Rule - K= L DD +S a ; Ka = WIP L DD = TPT PR (parts/min) For A Cell CT = 1/PR = MIN/PART TPT = CT SOH SO SOH controls TPT
63 RULE 5 KANBAN RULE K= L DD +S K = No. of carts ; a = cart size, L = Lead time, SS = Safety stock DD = Daily Demand = Cars/day Ka = DD L + SS = inventory in a link Little s Law = TPT = WIP/PR (for any manufacturing system) Or WIP = TPT PR (units in the system) = TPT/TT (units in inventory) For A Link For A System Ka = L DD = WIP = TPT PR (ignoring SS) a So L for a series of LINKS = TPT for system Note: DD = Cars/Day = PR = Cars/Day
64 LEAN MANUFACTURING Flexibility: - Mixed Model Final Assembly - Rapid tooling changeover in cells - Rapid modification for new products - LTFC Design to scale up or down - MO CO MOO operation in Sub Assembly Design Manufacturing Cells for One Piece Flow, Maintainability, Reliability, Durability Quick Tooling Exchange Single Cycle Automatics Integrated Quality 7 Tools, Poka yokes and Decouplers Design Machine for Lean Cells
65 Bio Sketch Dr. PHILLIPS Dr. Don T. Phillips is currently a Professor of Industrial and Systems Engineering at Texas A&M University, where he also holds the Chevron Distinguished Professor in Engineering. He received his Ph.D from the University of Arkansas in 1969, and has taught Industrial Engineering courses at The University of Texas at Austin, Purdue University and Texas A&M University. He is Author or Co-author of 6 other college textbooks and over 100 publications in technical journals or conference proceedings. He is a Fellow of the Institute of Industrial Engineers, and recently received a Lifetime Achievement Award from Lamar University where he earned a Bachelor of Science degree in Industrial Engineering. His current research interests are in Lean Manufacturing Systems, Systems Simulation, and Applied Operations Research.
66 Bio Sketch Dr. BLACK Dr. J T. Black is professor emeritus of Industrial and Systems Engineering at Auburn University. He officially retired in 1998 and has flunked retirement every year since by teaching one class a year on Lean production. He is a fellow of the Institute of Industrial Engineering, the American Society of Mechanical Engineering and the Society of Manufacturing Engineers. Dr. Black received his Ph.D from the University of Illinois, Champaign, Urbana in 1969, his Masters from West Virginia University in 1963 and his Bachelors degree in Industrial Engineering from Lehigh University in He has taught at West Virginia University, University of Illinois Urbana, University of Vermont, University of Rhode Island, The Ohio state university, University of Alabama Huntsville and Auburn University. Since retiring in 1998 he has received the 2004 SME Education Award developing manufacturing engineering curricula, and the Lean Teacher of the year award from IIE. He writes textbooks, poetry and songs. Textbooks he gets published, poetry has been published by SME and is still waiting for one of his country songs to make it big. He plays tennis with a passion and as often as his 72+ year old body will let him and he is able to find other senior citizens to play with. His latest adventure is taking his pug Vbo into the show ring. He is having fun.
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