Хонинговальные головки

External cylindrical grinding is primarily used for machining rotation-symmetrical workpiece contours and is subdivided by the type of workpiece positioning and main feed directions (Fig. 6-34). Fig. 6-34. External cylindrical peripheral grinding In the case of external cylindrical grinding between centres, the workpiece is clamped in frontal centring components and impelled by means of a […]

Silicon carbide is a technical product that is melted from quartz sand in a resis­tance arc furnace. In this method, silicon carbides of varying purity, toughness and colour can be produced by altering the process, as is the case for corundum. Pro­ceeding from the colour, we differentiate between green silicon carbide and black (dark) silicon […]

In order to appraise and examine grinding wheels, numerous requirements are placed on the testing method used. The most important are that the testing method is damage-free, is independent of the attendant and provides reproducible results. These requirements are oriented by the conditions of the call for proposals of the Vereins Deutscher Werkzeugmaschinenfabriken e. V. […]

Case-hardened steels include unalloyed construction steels, grade and special steels as well as alloyed special steels. Common to all of these is a relatively low carbon content (C < 0.2 %). Typical carbon contents and alloying components of case-hardened steels are represented in table 4-2. Element C Si Mn P S Amount in % 0.07 […]

In oxidic glasses, both covalent and ionic bonds predominate. They generally dis­play strong polarisation, which also causes its characteristically brittle removal behaviour. Should material shifting lead to the fracture of these bonds, the struc­ture of glass is destroyed irreparably as opposed to metals, the free electrons of which can form new bonds. Figure 4-18 shows […]

Setting back the bond is designated as sharpening. After profiling with diamond dressing tools, the wheel surface can be significantly flattened, leaving insufficient chip space for swarf and cooling lubricant transport in the grinding process (Fig. 6- 8. above). The sharpening process sets the bond back and thus creates the de­sired chip space (Fig. 6-8 […]

Here, we must differentiate between two methods. In external cylindrical periph­eral plunge grinding (infeed grinding), the grinding wheel is arranged normally to the workpiece rotation axis, while in external cylindrical peripheral longitudinal grinding the grinding tool is moved equidistantly to this axis. Both grinding meth­ods generally work with up grinding. In up grinding, the vectors […]

Key factors for quality and economic efficiency of industrial production are the choice of the manufacturing processes and their design. Manufacturing Technology is an elemental part of the fundamental knowledge of machining engineers. Also design engineers have to gain knowledge in this field, since they have high responsibility for the manufacturing costs. However, the students […]

The synthesis of cubic boron nitride (cBN) was first carried out by R. H. Wentorf in 1957 [WENT75]. cBN was first produced industrially in 1968 and, in 1969, it was introduced to the market under the brand name Borazon by the US General Electric Company. In contrast to grinding wheels with conventional abrasive materials, cBN […]

For example, the stylus test is a manual testing method which does not require any apparatus. Yet it has the disadvantage of being based on the subjective impression of the tester [PEKL60a]. A further hardness-testing method which should be mentioned is the Rockwell hardness test, which proceeds in the same way as in the hardness […]