63877-Ch18 - Cellular Mfg-3e-S 7-19, 21/06, 06/05/07...

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Cellular Mfg-3e-S 7-19, 21/06, 06/05/07 Chapter 18 CELLULAR MANUFACTURING REVIEW QUESTIONS 18.1 What is group technology? Answer : As defined in the text, 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. 18.2 What is cellular manufacturing? Answer : As defined in the text, cellular manufacturing is an application of group technology in which dissimilar machines or processes have been aggregated into cells, each of which is dedicated to the production of a part or product family or a limited group of families. 18.3 What are the production conditions under which group technology and cellular manufacturing are most applicable? Answer : The conditions identified in the text are (1) 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; and (2) the parts can be grouped into part families. 18.4 What are the two major tasks that a company must undertake when it implements group technology? Answer : The two major tasks are (1) identifying the part families and (2) rearranging production machines into machine cells. 18.5 What is a part family? Answer : As defined in the text, 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 manufacture. 18.6 What are the three methods for solving the problem of grouping parts into part families? Answer : The three methods are (1) visual inspection, (2) parts classification and coding, and (3) production flow analysis. 18.7 What is the difference between a hierarchical structure and a chain-type structure in a classification and coding scheme? Answer : In a hierarchical structure, also known as a monocode, the interpretation of each successive symbol depends on the value of the preceding symbols. In a chain-type structure, also known as a polycode, the interpretation of each symbol in the sequence is always the same; it does not depend on the value of preceding symbols. 18.8 What is production flow analysis? Answer : As defined in the text, production flow analysis is a method for identifying part families and associated machine groupings that uses the information contained on production route sheets rather than part drawings. Workparts with identical or similar routings are grouped into part families. 18.9 What are the typical objectives when implementing cellular manufacturing? Answer : As enumerated in the text, the objectives are to (1) shorten manufacturing lead times, by reducing setup, workpart handling, waiting times, and batch sizes; (2) reduce work-in-process inventory; (3) improve quality; (4) simplify production scheduling; and (5) reduce setup times.
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This note was uploaded on 09/16/2009 for the course INDUSTRIAL 0906547 taught by Professor Khaldontahboub during the Three '09 term at ADFA.

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63877-Ch18 - Cellular Mfg-3e-S 7-19, 21/06, 06/05/07...

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