TAILIEUCHUNG - Manufacturing Design, Production, Automation, and Integration Part 10

Tham khảo tài liệu 'manufacturing design, production, automation, and integration part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 10 Assembly The assembly of parts and subassemblies to form a product of desired functionality may involve a number of joining operations such as mechanical fastening adhesive bonding and welding. Although assembly processes are not value-adding operations and are commonly seen as necessary but wasteful tasks most of today s products are not manufacturable as single entities. Complexities of products range from a few parts in a piece of furniture to several million parts in commercial aircraft. Thus while some products are passed on to customers as a collection of individual parts for their assembly by the user with an incentive of reduced price most products have to be assembled prior to their sale because of either their complex and long assembly process or the specialized tools needed for their joining that are not usually owned by the perspective customers. Since an assembly process may add significant cost to the fabrication of a product different manufacturing strategies have been adopted over the past century for increased assembly efficiency Chap. 1 . These cost-cutting measures have included the use of mass production techniques for reduced setup and fixturing costs as well as specialization of human operators on one or two specific joining tasks the use of automation for highly repetitive operations and more recently the use of modular product design for simplification of assembly. Copyright 2003 by Marcel Dekker Inc. All Rights Reserved. Assembly relies on the interchangibility of parts concept introduced in the mid-1800s. Individual parts dimensions must be carefully controlled within their tolerance levels so that they can be assembled without further rework during their joining. This is a paramount issue in the batch production of goods . more than one of a kind and even more important when in the future individual components that wear out must be replaced with off-the-shelf parts. Systems operating at remote locations requiring replacement parts .

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