Хонинговальные головки

In order to form a chip, the grains cutting into the component must be harder than the material which is to be machined. Crystalline and brittle abrasive materials are used. The grains splinter during the crushing caused by the production process, so that the fragments possess an irregular form with more or less sharp corners […]

Vitrified bonds are formed by mixtures from the natural silicates red and white clay, kaolin and feldspar, as well as quartz and, as an additive, frits [HADE66, PADB93]. Frits are glassy, previously melted and pulverised organic and inorganic mixes which serve as fluxing agents and give the vitrified bond certain properties. Among other things, they […]

The binding agent makes the connection between the abrasive carrier medium and the abrasive grit and simultaneously braces the particular grits against each other. In order to achieve satisfactory grit adhesion, the binder consists of two layers ap­plied one after the other. Firstly, the prepared backing material is furnished with the basic bond (primary layer). […]

Non-rusting Chrome Steels Non-corrosion steels are distinguished by good resistance to chemically aggres­sive substances. In general, they have a chrome content of > 12 %. Non-rusting steels can be subdivided with respect to their structural components into ferritic and martensitic as well as into austenitic steels. Martensitic chrome steels contain about 0.4 — 1.2 % […]

Fig. 5-3 illustrates a classification of cooling lubricants based on DIN 51 385. The key differentiator is whether or not the cooling lubricant contains water in its ap­plication state. 5.2.1 Oils In principle, cooling lubricants are always composed of a suitable base fluid, to which various active substance (additives) may be added according to the […]

In the case of so-called “milling dressing” or kinematically coupled dressing, a fixed rpm ratio is set between the grinding wheel and a diamond segment or PCD dressing roller [EICH97, MERZ94, SPIE92, WARN88]. For integral rpm ratios, the same areas of dressing roller and grinding wheel are always engaged. When segmented diamond dressing tools are […]

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 […]