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S ch6
1.
6-1 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Chapter 6 Process Design and Facility Layout
2.
6-2 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Process Selection and System Design Forecasting Product and service design Capacity planning Facilities and Equipment Layout Work design Process selection Technological change
3.
6-3 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Introduction • Outsourcing, trend, reasons • Make or Buy? – Available capacity – Expertise – Quality Consideration – The nature of demand – Cost
4.
6-4 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout • Variety – How much • Flexibility – What degree • Volume – Expected output • The key trade-off Process Selection
5.
6-5 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Process Types • Projects • Job Shops • Batch Processing • Repetitive/Assembly • Continuous Processing
6.
6-6 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Figure 3.6 Product-Process Matrix for Processes (1) (2) (3) (4) (5) One of a kind Low volume, Multiple Few major High volume products, made low products products, high to customer standardization moderate higher standardization, order volume volume commodity products Process Characteristics (1) Complex and highly customized process, unique sequence of tasks (2) Jumbled flows, complex work with many exceptions (3) Disconnected line flows, moderately complex work (4) Connected line, routine work (5) Continuous flows, highly repetitive work LessComplexity,LessDivergence,MoreLineFlows Less Customization and Higher Volume Product Design Continuous process Project process Line process Batch process Job process
7.
6-7 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Product-Process Matrix Flexibility-Quality Dependability-Cost Continuous Flow Assembly Line Batch Job Shop Low Volume One of a Kind Multiple Products, Low Volume Few Major Products, Higher Volume High Volume, High Standard- ization Commercial Printer Heavy Equipment Automobile Assembly Sugar Refinery Flexibility- Quality Dependability Cost
8.
6-8 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout • Automation: Machinery that has sensing and control devices that enables it to operate Automation
9.
6-9 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Automation • Numerically controlled (NC) machines • Robot • Computer-aided design and manufacturing systems (CAD/CAM) • Flexible manufacturing systems • Computer-integrated manufacturing (CIM)
10.
6-10 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout • Layout: the configuration of departments, work centers, and equipment, with particular emphasis on movement of work (customers or materials) through the system Layout
11.
6-11 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout • Requires substantial investments of money and effort • Involves long-term commitments • Has significant impact on cost and efficiency of short-term operations Importance of Layout Decisions
12.
6-12 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Basic Layout Types • Product Layouts • Process Layouts • Fixed-Position • Combination Layouts
13.
6-13 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Basic Layout Types • Product Layout – Layout that uses standardized processing operations to achieve smooth, rapid, high- volume flow – Group equipments according to the sequential steps of operations of a specific product • Process Layout – Layout that can handle varied processing requirements – Group equipments according to their functions
14.
6-14 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout A Flow Line for Production or Service Flow Shop or Assembly Line Work Flow Raw materials or customer Finished item Station 2 Station 3 Station 4 Material and/or labor Statio n 1 Material and/or labor Material and/or labor Material and/or labor
15.
6-15 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Process Layout Process Layout - work travels to dedicated process centers Milling Assembly & Test Grinding Drilling Plating
16.
6-16 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Functional Layout Gear cutting Mill Drill Lathes Grind Heat treat Assembly 111 333 222 444 222 111 444 111 333 1111 2222 222 3333 111 444 111
17.
6-17 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Basic Layout Formats • Group Technology Layout • Cellular Layout • Fixed Position Layout – e.g. Shipbuilding Part Family W Part Family X Part Family Y Part Family Z
18.
6-18 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Cellular Layouts • Cellular Manufacturing – Layout in which machines are grouped into a cell that can process items that have similar processing requirements • Group Technology – The grouping into part families of items with similar design or manufacturing characteristics
19.
6-19 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout A U-Shaped Production Line 1 2 3 4 5 6 78910 In Out Workers
20.
6-20 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Cellular Manufacturing Layout -1111 -1111 222222222 - 2222 Assembly 3333333333 - 3333 44444444444444 - 4444 Lathe Lathe Mill Mill Mill Mill Drill Drill Drill Heat treat Heat treat Heat treat Gear cut Gear cut Grind Grind
21.
6-21 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Design Product Layouts: Line Balancing Line Balancing is the process of assigning tasks to workstations in such a way that the workstations have approximately equal time requirements.
22.
6-22 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Cycle Time Cycle time is the maximum time allowed at each workstation to complete its set of tasks on a unit.
23.
6-23 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Determine Maximum Output Output capacity = OT CT OT operating time per day D = Desired output rate CT = cycle time = OT D
24.
6-24 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Determine the Minimum Number of Workstations Required: Efficiency N = (D)( t) OT t = sum of task times
25.
6-25 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Precedence Diagram Precedence diagram: Tool used in line balancing to display elemental tasks and sequence requirements A Simple Precedence Diagrama b c d e 0.1 min. 0.7 min. 1.0 min. 0.5 min. 0.2 min.
26.
6-26 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Example 1: Assembly Line Balancing • Arrange tasks shown in the previous slide into workstations. – Use a cycle time of 1.0 minute – Assign tasks in order of the most number of followers
27.
6-27 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Solution to Example 1 Work- Station Time Remaining Eligible Assign Task Station Idle Time 1 1.0 .9 .2 a c none a c - .2 2 1.0 0 b none b - 0 3 1.0 .5 .3 d e - d e - .3 .5
28.
6-28 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Calculate Percent Idle Time Percent idle time = Idle time per cycle (N)(CT)
29.
6-29 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Line Balancing Rules • Assign tasks in order of most following tasks. • Assign tasks in order of greatest positional weight. – Positional weight is the sum of each task’s time and the times of all following tasks. Some Heuristic (intuitive) Rules:
30.
6-30 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Solution to Example 2 Station 1 Station 2 Station 3 Station 4 a b e f d g h c
31.
6-31 McGraw-Hill/Irwin Operations Management, Seventh
Edition, by William J. Stevenson Copyright © 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Process Design and Facility Layout Parallel Workstations 1 min.2 min.1 min.1 min. 30/hr. 30/hr. 30/hr. 30/hr. 1 min. 1 min. 1 min.1 min. 60/hr. 30/hr. 30/hr. 60/hr. 1 min. 30/hr. 30/hr. Bottleneck Parallel Workstations
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