tailieunhanh - Handbook of Lubrication part 2

Tham khảo tài liệu 'handbook of lubrication part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 32 CRC Handbook of Lubrication between the static and dynamic coefficient of friction for avoiding squeal or vibrations from brakes and clutches. 3. Quality control components that require constant friction. Two examples may be cited but there are many more a. In knitting and weaving of textile products the tightness of weave must be controlled and reproducible to produce uniform fabric. b. Sheet metal rolling mills require a well-controlled coefficient of friction in order to maintain uniformity of thickness width and surface finish of the sheet and in some instances minimize cracking of the edges of the sheet. 4. Low friction components that are expected to operate at maximum efficiency while a normal force is transmitted. Examples are gears in watches and other machines where limited driving power may be available or minimum power consumption is desired bearings in motors engines and gyroscopes where minimum losses are desired and precision guides in machinery in which high friction may produce distortion. SURFACE CHARACTERISTICS AND STATIC CONTACT AREA Frequently the coefficient of friction is more dependent upon surface properties and surface finish than on substrate properties. Substrate properties however influence both the surface finish achieved in processing and the kinetics of adsorption of chemical species. Surface Structure and Finish With the exception of surfaces that solidify from the liquid either in air in vacuum or in contact with a mold most technological surfaces are formed by a cutting operation. Coarse cutting is done with a cutting tool in a lathe drill press milling machine etc. Finer cutting is done with abrasives by grinding honing lapping etc. Cutting is simply localized fracture. Each individual microfracture joins another and or extends into the substrate. The orientation of surface facets and the direction taken by subsurface cracks are often dependent upon the structure of the material. Seriousness of a substrate crack will probably

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