大学机械专业英语总结_机械专业英语总结
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Unit 11 Machine tools have evoled from the early foot-powered lathes of the Egyptians and John Wilkinson’s boring mill.Most machining operations produce parts of differing geometry.Flat or plain surfaces are frequently required.Multiple-edged tools can also be used.The basic operations performed on an engine lathe are illustrated in Fig11-3.Those operations performed on external surfaces with a single point cutting tool are called turning.The objective of boring a hole in a lathe is:
1.Toenlarge the hole 2,Tomachine the hole to the desired diameter.3.To accurately locate the position of the hole.4.To obtion a smoth surface finish in the hole.Unit12 Broaching is a proce for internal or external machining of falt, round, or contoured surfaces.Sawing is the parting of material by using metal disks, blades, bands, or abrasive disks as the cutting tools, Reaming is a machining proce for enlarging, smoothing and/or accurately sizing existing holes by means of multiedge flutes cutting tools.Unit 13 Welding is eential to the expansion and productivity of our industries.Electroplating is a proce in which a metal is deposited onto a metallic substrate.Soldering is the joining of metals by causing a lower-melting-point metal to wet or alloy with the joint surfaces and then freeze in place.Cleaning operations are performed both preparatory to and after finishing operations.Unit 14 Lathes are designed to rotate the workpiece and feed the cutting tool in the direction neceary togenerate the required machined surface.Vertical-boring machine
horizontal-boring machine
planning machine
horizontal-milling machine
vertical-milling machine Unit 15 AJM removes material through the mechanical cation of a focused stream of abrasiveladen gas.USM is a mechanical material removal proce which is used to generate holes and cavities in hard or brittle workpieces.ECM is a proce that removes material through the ptinciple of eiectrolysis.Unit 16 Group technology is a very important methodology in today’s manufacturing environment, particularly for batch production, and is becoming increasingly significant.For parts to be grouped based on either design characteristics and featuers or manufacturing procees, they must be claified into predetermined categories and coded for retrieval and use.Unit 17 Flexibility is an important characteristic in the modern manufacturing setting.Cellular manufacturing is the concept of organizing plant facilities and proce planning for family-of-part manufactuer.Machine centers originsted out of their capability to perform a variety of machining operations on a workpiece by changing their own cutting tools.Software is the vital invisible element than actually drives the FMS.There are two basic levels of software required for an FMS: 1:operating system 2:application software Unit 18 Computer integrated manufacturing is the term used to describe the modern approach to manufacturing.Management is the proce of making directing the activities of personnel to achieve stated objectives.An AGV is a computer-controlled, driverle vehicle used for transporting materials form point in a manufacturing setting.In any discuion of AGVs, three key terms are frequently used: 1:Guide path.2:Routing.3:Traffic management.Unit 19 Part acquisition time is highly dependent on the nature of the layout of the aenmbly area and the method of aembly.Aembly in the manufacturing proce consists of putting together all the component parts and sub-aemblies of a given product, fastening, performing inspections and functional tests, labeling, separating good aemblies from bad, and packaging and or preparing them for final use.Unit 20
Automation is a widely used term in manufacturing.Fixed automation is what Harder was referring to when he coined the word automation.Numerical control can be defined as a form of programmable automation in which the pro is controlled by numbers, letters, and symbols.The program of instructions is the detailed step-by-step set of directions which tell the machine tool what to do.The highest degree of automation obtainable with special-purpose, multifunction machines is achieved by using transfer machines.
