Question

Compare and contrast capp and cmpp systems

Answer 1

. ME 2402 – COMPUTER INTEGRATED MANUFACTURING (CIM) YEAR/SEMESTER : IV/VII UNIT III – GROUP TECHNOLOGY AND CAPP Prepared By MANIMARAN.M ASSISTANT PROFESSOR K.RAMAKRISHNAN COLLEGE OF ENGINEERING TRICHY 1/25/2016 1M.MANIMARAN KRCE TRICHY2. UNIT III GROUP TECHNOLOGY AND CAPP History Of Group Technology – role of G.T in CAD/CAM Integration – part families classification and coding – DCLASS and MCLASS and OPTIZ coding systems – facility design using G.T – benefits of G.T – cellular manufacturing. Process planning - role of process planning in CAD/CAM Integration – approaches to computer aided process planning – variant approach and generative approaches – CAPP and CMPP systems. 1/25/2016 M.MANIMARAN KRCE TRICHY 23. GROUP TECHNOLOGY (GT)  GT is a manufacturing philosophy in which similar parts are identified & grouped together to make advantage of their similarities in design and production.  Similar parts bare arranged into part families, where each part family possesses similar design and/or manufacturing characteristics.  Grouping the production equipment into machine cells, where each cell specializes in the production of a part family, is called cellular manufacturing 1/25/2016 M.MANIMARAN KRCE TRICHY 34. History of GT • 1925 – F.W.Taylor need for standardization, inspection and supervision • 1925 – R.Flanders presented a paper in ASME about organisationing manufacturing, USA. • 1937 – A.sokolovskiy essential features of GT at Soviety Union • 1949 – A.korling of Sweden presented a paper in paris “Group Productiion” • 1959 – S.P Mitrofanov a Russian, Published a book entitled “Scientific Principal of GT” • 1960 – west german and Great Britain started serios studies about GT technology H.opitz german researcher, studied work parts manufactured and coding system • 1963 – Concept of GT is well recognized and widely applied in many industries • 1990 – concepts of CMS involved 1/25/2016 M.MANIMARAN KRCE TRICHY 45. Implementing Group Technology (GT) 1. 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. 2. Rearranging production machines into cells It is time consuming and costly to plan and accomplish this rearrangement, and the machines are not producing during the change over. 1/25/2016 M.MANIMARAN KRCE TRICHY 56. Part Families • Part family - Group of similar parts • Machine cell - Group of machineries used to process an individual part family • 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. 1/25/2016 M.MANIMARAN KRCE TRICHY 67. Part Families Similar prismatic parts requiring similar milling operations Dissimilar parts requiring similar machining operations (hole drilling, surface milling Identical designed parts requiring completely different manufacturing processes 1/25/2016 M.MANIMARAN KRCE TRICHY 78. • One of the important manufacturing advantages of grouping work parts into families can be explained with reference to figures below 1/25/2016 M.MANIMARAN KRCE TRICHY 89. METHODS FOR PART FAMILY There are three general methods for solving part families grouping. All the three are time consuming and involve the analysis of much of data by properly trained personnel. The three methods are:  Visual inspection.  Parts classification and coding.  Production flow analysis. 1/25/2016 M.MANIMARAN KRCE TRICHY 910. Visual Inspection Method • The visual inspection method is the least sophisticated and least expensive method. • It involves the classification of parts into families by looking at either the physical parts or their photographs and arranging them into groups having similar features. 1/25/2016 M.MANIMARAN KRCE TRICHY 1011. Parts Classification and Coding Method • In parts classification and coding, similarities among parts are identified, and these similarities are related in a coding system. • Two ca