tailieunhanh - Mechanical Engineers Data Handbook Episode 14

Tham khảo tài liệu 'mechanical engineers data handbook episode 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | GLOSSARY OF TERMS 315 creep Slow plastic deformation of metals under stress particularly at high temperatures. creep resistance Resistance of metals to creep. critical speed A rotational speed corresponding to a natural frequency of transverse vibrations of the member. Also called whirling speed . crossflow heat exchanger A heat exchanger in which the two fluids flow at right angles to one another. cutting fluid A fluid used in metal cutting to improve finish tool life and accuracy. It acts as a chip remover and a coolant. cutting speed The linear or peripheral speed of relative motion between a cutting tool and workpiece in the principal direction of cutting. cyaniding The introduction of carbon and nitrogen into a solid ferrous alloy by holding it at a suitable high temperature in contact with molten cyanide. cycloidal gears Gears with teeth whose flank profile consists of a cycloidal curve. cylindrical grinding Grinding the outer cylindrical surfaces of a rotating part. damped vibration vibrations reduced in amplitude due to energy dissipation. damping The reduction in amplitude of vibrations due to mechanical friction in a mechanical system or by electrical resistance in an electrical one. deceleration Negative acceleration. The rate of diminution of velocity with time. The unit is metres per second per second ms 2 . dedendum The radial distance between pitch circle and the bottom of a gear tooth. deflection The amount of bending compression tension or twisting of a part subject to load. density The mass of a unit volume of a substance. The unit is kilograms per metre cubed kgm 3 . depth of cut The thickness of material removed from a workpiece in a machine tool during one pass. dial gauge A sensitive mechanical instrument in which a small displacement . mm is indicated on a dial. diametral clearance The difference in diameter between a shaft and the hole into which it fits or runs . in plain journal bearings. diamond dust The hardest substance used