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【正文】 s ,although economics and manufacturability a role in the selection. A typical processing sequence to fabricate an individual part consists of : (1) a basic process,(2)secondary processes ,(3) operations to enhance physical properties,and (4)finishing sequence is shown in . A basic process determines the starting geometry of the casting ,plastic molding ,and roling of sheet metal are examples of basic starting geometry must often be refined by secondary 4 processes,operations that transform the starting geometry (or close to final geometry ).The secondary geometry processes that might be used are closely correlated to the basic process that provides the starting sand casting is the basic processes,machining operations are generally the second processes .When a rolling mill produces sheet metal,stamping operations such as punching and bending are the secondary plastic injection molding is the basic process ,secondary operations are often unnecessary,because most of the geometric features that would otherwise require machining can be created by the molding molding and other operation that require no subsequent secondary processing are called shape that require some but not much secondary processing (usually machining ) are referred to as near shape impression die fings are in this category .These parts can often be shaped in the fing operation(basic processes)so that minimal machining (secondary processing )is required . Once the geometry has been established ,the next step for some parts is to improve their mechanical and physical properties .Operations to enhance properties do not alter the geometry of the part。 (2) a brief description of each operation indicating the processing to be acplished,with references to dimensions and tolerances on the part drawing。1 附錄 Process Planning The product design is the plan for the product and its ponents and convert the product design into a physical entity ,a manufacturing plan is needed .The activity of developing such a plan is called process planning .It is the link between product design and manufacturing .Process planning involves determining the sequence of processing and assembly steps that must be acplished to make the product .In the present chapter ,we examine processing planning and several related topics. At the outset ,we should distinguish between process planning and production planning ,which is covered in the following chapter. Process planning is concerned with the engineering and technological issues of how to make the products and its parts
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