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  Text 1The production department sets up and uses the tools and machines to make the product A management worker, the supervisor, is normally in charge of this department The supervisor tells the pro

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  Text 1Four general types of cutting fluids aremonly used in machining operations: oils, emulsions, semisynthetics, and syntheticsAn emulsion is admixture of two immiscible liquids (usually of oi

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  Text 1Alloy steels contain significant amounts of alloying elements Structural-grade alloy steels, as identified by ASYM specifications，are used mainly in the construction and transportation Industr

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  Text 1Materials differ widely in physical properties, machinability characteristics, methods of forming, and possible service lifeMechanical materials fall into two basic types: metallic or non-meta

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  Text 1Many metallic and nonmetallic materials can be machined without a cutting fluid, but in most cases, the application of a cutting fluid can improve the operation significantly Appropriate to va

• 118_试卷试题(2).doc

  Text 1There are three basic methods of cutting fluid application:1 Flood cooling This is the mostmon method Flow rates range from 10 L/min (3 gal/min) for single-point tools to 225 L/min (60 gal

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  Text 1Low-melting alloys are so named because of their relatively low melting points The major metals in this category are lead, zinc, and tin and their alloys Lead(Pb) has properties of high densit

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  Text 1A grinding machine is a random point cutting tool which uses abrasives in the shape of a wheel, bonded to a belt, a stick or simply suspended in liquidOn a cylindrical grinding machine the gri

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  Text 1By virtue of their wide range of mechanical, physical, and chemical properties, ferrous metals and alloys are among the most useful of all metals Ferrous metals and alloys contain iron as thei

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  Text 1Materials differ widely in physical properties, machinability characteristics, methods of forming, and possible service lifeMechanical materials fall into two basic types: metallic or non-meta