By BARBARA LINKE
This monograph makes a speciality of abrasive instruments for grinding, sprucing, honing, and lapping operations. The ebook describes the lifestyles cycle of abrasive instruments from uncooked fabric processing of abrasive grits and bonding, production of monolithic or multi-layered instruments, device use to software end-of-life. in addition, this paintings highlights sustainability demanding situations together with fiscal, environmental, social and technological points. the objective viewers basically includes study and specialists within the box of producing, however the e-book can also be priceless for graduate students.
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Additional info for Life Cycle and Sustainability of Abrasive Tools
18 left). The high pressure high temperature (HPHT) chamber forms inside the hollow cylinder. Shrunked-on steel rings compress and pre-load the cylinder and anvils [LUND68]. Graphite as reaction mass is put into the HPHT chamber and coated concentrically with pyrophyllite, which is an aluminum silicate and isolates the reaction mass [LUND68]. The anvils are pressed 50 Pressure [GPa] 40 Diamond 30 20 Liquid Commercial synthesis by catalysis 10 Graphite 0 1000 2000 3000 4000 Temperature [K] Fig. 17 Pressure-temperature diagram of carbon [BUND96] 5000 6000 30 2 Abrasives Reaction mass in holder Steel rings Carbide cylinder Isolation Carbide anvils Fig.
Their advantage is the high coating hardness. 2 Metallic Coatings Metal coatings (also called claddings) came up in the mid 1960s for diamond grits in resin bonded wheels [DYER79]. The metallic coatings were in weight equal or exceeded the weight of the diamond grit [DYER79]. 7 Grit Coatings 39 metallic coatings, primarily in metal bond wheels, had not been successful [DYER79]. Diamond in resin bonded tools, in particular for grinding cemented carbides, are usually coated with nickel comprising about 55 % by weight of the grit and coating [MALK08, p.
4 Toughness, Breaking Behavior Today, grits are available in a large range of toughness suitable for many applications [MARI04, p. 347]. Hard and friable abrasives are generally applied in precision grinding, whereas tough, large grits are more suitable for heavy-duty grinding [MALK08]. Grit types for resin bonds are usually more friable than for bronze bonding [BÜTT68, p. 73]. Toughness is the resistance of a material against breakage and crack propagation and is often measured under dynamic conditions [LINK15].