Хонинговальные головки

Under consideration is the grinding gap arrangement shown in Fig. 6-50. When dealing with geometrical process stability in centreless grinding, we proceed from the assumption that the workpiece constantly abuts the three contact locations S, A and R during the process [GURN64, ROWE65, SCHR71]. The machine compo­nents encompassing these system boundaries are considered ideally rigid. […]

In addition to the geometry of the individual cutting edges, the way in which the hard material grains engage is also important. The four possible operating princi­ples for this are represented in Fig. 2-5. Fig. 2-5. Operating principles of cutting edge employment In the case of abrasive blast cutting, the grains are unbonded and collide […]

Metallic bonds exist in multiple varieties. All metallic bonds exhibit, in contrast to grinding wheels bonded with resins or vitrified mixtures, an increased level of heat conductivity. The properties of metallic bonds can be summarised along these lines: • high resistance to wear, • difficult to dress, or, in the case of single-layered grinding wheels, […]

As abrasive grit types for abrasive belts, corundum and silicon carbide are used almost exclusively. For large material removal volumes, as is common in steel machining, zircon corundum, for instance, has proved useful [DENN89, N. N.6]. However, for the fine machining of bearings, crankshafts, camshafts, sealing surfaces, fibre-reinforced plastics, audio and video magnet heads and […]

Ferritic Structures Materials with predominately ferritic structures are but seldom subject to grinding, being usually machined instead with geometrically defined cutting edges. In the case of grinding, low strength and hardness as well as the high deformability of ferritic structures leads to frequent clogging of the grinding wheel. For this reason, the use of open-pored […]

Oil-in-water emulsions are used when what matters is a good cooling effect and not as much the lubrication effect. For oil-in-water emulsions, an even distribution of extremely fine oil droplets in water is obtained by means of so-called emulsifi­ers. Since the physical properties of emulsions is largely the same as that of water — the […]

The swarf produced by the grinding process can get fixed in the grinding wheel. This so-called clogging or loading of the grinding wheel leads to a reduction of chip space, so that less cooling lubricant can get access to the machining location. On the other hand, swarf removal from the contact zone is also hampered. […]

Fig. 6-54 shows the elementary geometrical and kinematic quantities of centreless plunge grinding. A comparison of the parameters with those of plunge grinding between centres shows considerable conformance. Only the workpiece rotational speed nw develops but indirectly as a function of the rotational speed and the con­trol wheel diameter. If there is no slippage between […]

The distribution of force and energy can be considered both microscopically with relation to the individual grits as well as macroscopically on the scale of the entire grinding wheel. In the following, we will begin with a microscopic observation and then expand this with macroscopic considerations. The cutting force acting upon the individual grit during […]

Besides the basic materials described above, the bonds of abrasive tools occasion­ally contain a number of additives. These are, on the one hand, necessary for the manufacturing process of the tools, and, on the other, help to create specifically defined grinding properties. Fillers contained in the matrix of grinding wheels bonded with synthetic resin can […]