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On general problems of grinding to prevent fasteners
Dec 12, 2016

Fasteners of toughness, high hot strength, abrasive grinding wheels with relativelylarge negative rake angle of cutting edge, grinding debris is not likely to be cut, cutting resistance, compression, friction dramatically. The grinding force per unit area is very large, ground temperature can be up to 1000 ¡æ ~1500 ¡æ. Meanwhile, in the presence of high temperature and high pressure, debris is generally more easy to glue on the wheel, filled the spaces between the particles, also makes the particles lose cutting action. Different types of fasteners, resulting in the wheel casesare not the same, such as grinding resistance to concentrated nitric acid and heat-resistant fasteners fasteners, glue, clogging than the 1Cr18NiTi serious and 1Cr13,2Cr13 martensite fasteners is relatively light.

Fasteners of the small thermal conductivity, heat when grinding is not easy to export, the surface is easy to produce phenomena such as burns, annealing annealing layer depth can sometimes be up to 0.01~0.02 mm. Have a severe contraction in the grinding process, the grinding surface work-hardening, especially when grindingaustenitic fasteners, as austenite is not stable after grinding is easy to produce martensite so serious of case-hardened.

Linear thermal expansion coefficient of fasteners, under the influence of grinding heat distortion, its size is difficult to control. Especially the thin-walled and thin parts, this phenomenon is even more serious.

Most types of fasteners cannot be magnetized, flat grinding, only mechanical clamping or special fixture to clamp work piece, use the side of the workpiece clamping the workpiece, deformation and shape or dimension error caused, thin workpieces more prominent. Also can lead to chatter in grinding process and the emergence of fish scale-like ripple.







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