Process Planning and Concurrent Engineering——工艺规程制订与并行工程【毕业设计】

发布日期:[10-03-23 21:47:31] 浏览人次:[]

discussion of concurrent engineering.

Computer-aided Process Planning

There is much interest by manufacturing firms in automating the task of process planning using computer-aided process planning (CAPP) systems. The shop-trained people who are familiar with the details of machining and other processes are gradually retiring, and these people will be available in the future to do process planning. An alternative way of accomplishing this function is needed, and CAPP systems are providing this alternative. CAPP is usually considered to be part of computer-aided manufacturing (CAM). However, this tends to imply that CAM is a stand-along system. In fact, a synergy results when CAM is combined with computer-aided design to create a CAD/CAM system. In such a system, CAPP becomes the direct connection between design and manufacturing. The benefits derived from computer-automated process planning include the following:

  .Process rationalization and standardization.  Automated process planning leads to more logical and consistent process plans than when process is done completely manually. Standard plans tend to result in lower manufacturing costs and higher product quality.

  .Increased productivity of process planner.  The systematic approach and the availability of standard process plans in the data files permit more work to be accomplished by the process planners.

  .Reduced lead time for process planning.  Process planner working with a CAPP system can provide route sheets in a shorter lead time compared to manual preparation.

  .Improved legibility.  Computer-prepared rout sheets are neater and easier to read than manually prepared route sheets.

  .Incorporation of other application programs.  The CAPP program can be interfaced with other application programs, such as cost estimating and work standards.

Computer-aided process planning systems are designed around two approaches. These approaches are called: (1) retrieval CAPP systems and (2) generative CAPP systems .Some CAPP systems combine the two approaches in what is known as semi-generative CAPP.

Concurrent Engineering and Design for Manufacturing

Concurrent engineering refers to an approach used in product development in which the functions of design engineering, manufacturing engineering, and other functions are integrated to reduce the elapsed time required to bring a new product to market. Also called simultaneous engineering, it might be thought of as the organizational counterpart to CAD/CAM technology. In the traditional approach to launching a new product, the two functions of design engineering and manufacturing engineering tend to be separated and sequential, as illustrated in Fig.(1).(a).The product design department develops the new design, sometimes without much consideration given to the manufacturing capabilities of the company, There is little opportunity for manufacturing engineers to offer advice on how t

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