金工实习英文讲义-磨工.docxVIP

Mechanical Engineering TrainingGrindingName: Student NO.: Date:Introduction to GrindingGrinding is an abrasive machining process that uses a grinding wheel as the cutting tool.A wide variety of machines are used for grinding:Hand-cranked knife-sharpening stones (grindstones)Handheld power tools such as angle grinders and die grindersVarious kinds of expensive industrial machine tools called grinding machinesBench grinders often found in residential garages and basementsGrinding practice is a large and diverse area of manufacturing and toolmaking. It can produce very fine finishes and very accurate dimensions; yet in mass production contexts it can also rough out large volumes of metal quite rapidly. It is usually better suited to the machining of very hard materials than is regular machining (that is, cutting larger chips with cutting tools such as tool bits or milling cutters), and until recent decades it was the only practical way to machine such materials as hardened steels. Compared to regular machining, it is usually better suited to taking very shallow cuts, such as reducing a shaft’s diameter by half a thousandth of an inch or 12.7 μm.Grinding is a subset of cutting, as grinding is a true metal-cutting process. Each grain of abrasive functions as a microscopic single-point cutting edge, and shears a tiny chip that is analogous to what would conventionally be called a cut chip (turning, milling, drilling, tapping, etc.). However, among people who work in the machining fields, the term cutting is often understood to refer to the macroscopic cutting operations, and grinding is often mentally categorized as a separate process. This is why the terms are usually used in contradistinction in shop-floor practice, even though, strictly speaking, grinding is a subset of cutting.In this training course, considering the availability of required equipment in the training center, we will focus on the training of metal casting methods. Types of Grinding ProcessSelecting whi