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Group Technology

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Published in: Mechanical
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Presentation on Group Technology

Trinity A / Chandigarh

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Teaches: Indian National Mathematical Olympiad (INMO), Mental Maths, Olympiad Exam Preparation, Regional Mathematical Olympiad (RMO), Advanced Excel, Basic Computer, MS Office, School Level Computer, Mathematics, Statistics, Science, Social Studies, B.Tech Tuition, Drawing, Mechanical, AutoCAD Training, French, German, Study in Germany

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  1. Group Technology
  2. Group technology - Introduction ' Group technology is a manufacturing philosophy in which similar parts are identified and grouped together to take advantage of their similarities in design and production. ' Similar parts are arranged into part families, where each part family possesses similar design and/or manufacturing characteristics. ' For example, a plant producing 10,000 different part numbers may be able to group the vast majority of these parts into 30-40 distinct families.
  3. ' The manufacturing efficiencies are generally achieved by arranging the production equipment into machine groups or cells, to facilitate work flow. ' Grouping the production equipment into machine cells, where each cell specializes in the production of a part family, is called cellular manufacturing.
  4. Where to use ' The plant currently uses traditional batch production and a process type layout and this results in much material handling effort, high in- process inventory, and long manufacturing lead times. ' The parts can be grouped into part families. This is a necessary condition. Each machine cell is designed to produce a given part family or limited collection of part families, so it must be possible to group parts made in the plant into families.
  5. What to do before implementing GT ' Identifying the part families. If the plant makes 10,000 different parts, reviewing all of the part drawings and grouping the parts into families is a substantial task that consumes a significant amount of time. ' Rearranging production machines into machine cells. It is time consuming and costly to plan and accomplish this rearrangement and the machines are not producing during the changeover.
  6. Benefits of GT ' GT promotes standardization of tooling, fixturing and setups. ' Material handling is reduced because parts are moved within a machine cell rather than within the entire factory. ' Process planning and production scheduling are simplified. ' Setup times are reduced, resulting in lower manufacturing lead times. ' Work-in-process is reduced. ' Worker satisfaction usually improves when workers collaborate in a GT cell. ' Higher quality work is accomplished using group technology.
  7. Group Technology - Part Families ' A part family is a collection of parts that are similar either because of geometric shape and size or because similar processing steps are required in their manufacturing. ' A group of parts that possess similarities in geometric shape and size, or in the processing steps used in their manufacture ' Part families are a central feature of group technology ' There are always differences among parts in a family ' But the similarities are close enough that the parts can be grouped into the same family
  8. ' Two parts that are identical in shape and size but quite different in manufacturing: units/yr, tolerance = ±O.OIO inch, 1015 CR steel, nickel plate (CR = Cold Rolled ) (b)100/yr, tolerance = ±O.OOI inch, 18-8 stainless steel (a) (b)
  9. ' Ten parts that are different in size and shape, but quite similar in terms of manufacturing ' All parts are machined from cylindrical stock by turning; some parts require drilling and/or milling
  10. Obstacles in changing to GT ' The biggest single obstacle in changing over to group technology from a conventional production shop is the problem of grouping the parts into families. ' There are three general methods for solving this problem, which involve the analysis of much data by properly trained personnel. 1. 2. 3. Visual inspection - using best judgment to group parts into appropriate families, based on the parts or photos of the parts Production flow analysis - using information contained on route sheets to classify parts Parts classification and coding - identifying similarities and differences among parts and relating them by means of a coding scheme
  11. GROUP LAYOUT WHERE MACHINE ARE ARRANGED AS PER PROCESS Lathe m/c Milling m/c Milling m/c Drilling m/c Drilling m/c Grinding m/c Grinding m/c Assembly Assembly Assembly
  12. ADVANTAGES OF GT. Reduction in number of drawings Reduction in set up and production time Improved machine loading Reduces manufacturing lead time Leads to automated process planning Less material movement Reduces change in set up Better utilisation of tools and equipment Less number of defects and rejections
  13. LIMITATIONS ' High cost of implementation. ' Rearranging of machine is very difficult and time consuming process. ' There are large number of group technology codes. ' It is not be suitable when very wide varieties of product are manufactured

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