TAILIEUCHUNG - Surface Engineering of Metals - Principles, Equipment and Technologies Part 8

Tham khảo tài liệu 'surface engineering of metals - principles, equipment and technologies part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Application of laser heating in surface engineering Laser treatment of surfaces is applied in a technological manufacturing cycle in a manner similar to electron beam treatment. Since like electron beam treatment it allows the treatment of selected small areas of material it also allows minimization of mechanical deformation stemming from the heat effect reducing it exclusively to the heat affected zone and the formation of residual stresses. The range of applications of laser heating is similar to although broader than that in electron beam heating because heating of the load usually takes place in air which facilitates manipulation of the radiating beam. It can be used to reach elements which are otherwise difficult to access . inaccessible to an inductor in induction hardening hardening of partially assembled rear axles of autos 5 48 or of selected fragments of load surface. Fig. Examples of laser hardening of flat surfaces. Most often the laser beam is utilized to treat long flat surfaces Fig. or objects with a triangular cross-section . guide rails 138 surfaces of rotational symmetry rubbing surfaces of bush bearings crankshafts pistons cylinders piston rings clamps bearing races etc. specially shaped surfaces cams plates clutch elements valve seats Figs. to surfaces forming the geometry of cutting edges cutting tools knives saws or surfaces of forming tools . forging dies Fig. . The laser beam may be used to heat not only materials situated in air but also in those placed in other partially transmitting environments in other gases or liquids . in water or to heat through partially transmitting media. Best effects of laser beam transmission naturally are obtained in vacuum. Lasers allow moreover especially in the case of pulse treatment to deliver to the selected spot such great amounts of energy within such short a time even of the order of billionths of a second that the temperature of zones adjacent to the heated .

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