Group technology and cellular manufacturing

Group technology and cellular manufacturing - MIDDLE EAST...

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1 GROUP TECHNOLOGY AND CELLULAR MANUFACTURING MIDDLE EAST TECHNICAL UNIVERSITY Mechanical Engineering Department ME 445 ME 445 Integrated Manufacturing Systems Integrated Manufacturing Systems
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2 BATCH MANUFACTURING IS A DOMINANT MANUFACTURING ACTIVITY IN THE WORLD, GENERATING A GREAT DEAL OF INDUSTRIAL OUTPUT IT ACCOUNTS 60% - 80% OF ALL MANUFACTURING ACTIVITIES
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3 CHARACTERISTICS OF BATCH MANUFACTURING: High level of product variety Small manufacturing lot size
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4 Time on machine 5% Moving and waiting 95% Cutting less than 30% Positioning, loading, gauging, idle, etc. 70%
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5 WHAT IS GROUP TECHNOLOGY? Group technology (GT) is a philosophy that implies the notion of recognizing and exploiting similarities in three different ways: 1. By performing like activities together 2. By standardizing similar tasks 3. By efficiently storing and retrieving information about recurring problems
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6 Large manufacturing system can be decomposed into smaller subsystems of part families based on similarities in 1. design attributes and 2. manufacturing features
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7 DESIGN ATTRIBUTES: part configuration (round or prismatic) dimensional envelope (length to diameter ratio) surface integrity (surface roughness, dimensional tolerances) material type raw material state (casting, forging, bar stock, etc.)
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8 PART MANUFACTURING FEATURES: operations and operation sequences (turning, milling, etc.) batch sizes machine tools cutting tools work holding devices processing times
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9 An essential aspect of the integration of CAD and CAM is the integration of information used by engineering and manufacturing and all the other departments in a firm.
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10 Group technology emphasis on part families based on similarities in design attributes and manufacturing, therefore GT contributes to the integration of CAD and CAM.
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11 The Basic Key Features for a Successful Group Technology Applications: Group Layout Short Cycle Flow Control A Planned Machine Loading
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12 Group Layout In most of today’s factories it is possible to divide all the made components into families and all the machines into groups, in such a way that all the parts in each family can be completely processed in one group only. The tree main types of layout are Line Layout Group Layout Functional Layout
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13 Line Layout Line Layout is used at present in simple process industries, in continuous assembly, and for mass production of components required in very large quantities.
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14 Functional Layout In Functional Layout, all machines of the same type are laid out together in the same section under the same foreman. Each foreman and his team of workers specialize in one process and work independently.This type of layout is based on process specialization.
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15 Group Layout In Group Layout, each foreman and his team specialize in the production of one list of parts and co-operate in the completion of common task. This type of layouts based on component specialization.
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16 The Difference between group and functional layout:
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This note was uploaded on 03/21/2010 for the course KNOWLEDGE 5654 taught by Professor Mr.david during the Spring '10 term at IESE Business School.

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Group technology and cellular manufacturing - MIDDLE EAST...

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