Хонинговальные головки

Chattering represents one of the main causes of quality problems in grinding, be­cause the dimension and shape accuracy as well as the surface quality are influ­enced negatively [BAUS03, KARP01]. Chattering can be traced back to self­excitation. In the grinding process, the main causes of forced vibrations are primarily im­balance and grinding wheel eccentricity. Further possible […]

The input variables of the grinding process determine the process parameters and the grinding results to a decisive degree. A continuous chip removal is guaranteed according to DIN 6580 by the coordination of the cutting motions and the infeed motion. The infeed motion can be composed of several components. Moreover, in some methods, a depth […]

The input variables of the honing process can be divided into system quantities and variables (Fig. 7-7). Fig. 7-7. Process variables and result of the honing process The following system quantities represent most frequently fixed process vari­ables: • the machine, with its performance data, material rigidity and dynamic behav­iour, • the workpiece, with its properties, […]

Different from lapping with one disc is the double-sided, simultaneous machining of two opposing planar surfaces (Fig. 8-6). In this method, the workpieces are in­serted in geared carriers (rotating discs). These are held by pin rings or gear rings. Then they are driven, they rotate about both their own axis and the central axis. The […]

9.1.2 Operating Principle Defined generally, free abrasive grinding is a cutting process in which free abra­sive parts — so called chips — remove material from the workpiece surface. It is not an improvement in form and dimension which is in the foreground in this case, but rather the elimination of surface faults and the establishment […]

The mechanical energy added during the grinding process is converted to a large extent into heat during cutting edge engagement. Most of this heat relates to sur­face friction and plastic material deformation, whereby the main source of heat is to be found beneath the abrasive grain. Because of this, there is a local increase in […]

As in the case of external cylindrical grinding, internal cylindrical grinding is also classified as • internal cylindrical peripheral crosswise grinding (plunge grinding) or • internal cylindrical peripheral longitudinal grinding (longitudinal grinding). The kinematics of internal cylindrical grinding is identical to that of the exter­nal cylindrical grinding methods between centres already described. The equations derived […]

In the case of surface peripheral plunge grinding, there is a possibility of changing the material removal rate by means of both workpiece speed and the depth of cut. However, one can also alter both variables in an inverse fashion such that Q’w re­mains constant. Fig. 6-110 shows how the methodological variants of deep feed […]

A variation of the contact pressure pn does not always have an obvious influence on the process parameters and the work result. The tool’s specifications and asso­ciated wear characteristics often constitute parameters for influencing pn. In prac­tice, however, effects arising from the contact pressure can be cited for the major­ity of honing processes. Whereas in […]

The principle of peripheral external cylindrical lapping is illustrated in Fig. 8-4c. A slit in the tool enables the widening and narrowing of this sleeve-shaped tool design. This allows the intended working pressure and the desired dimensions to be adjusted. In order to improve the shape in terms of cylindricity and roundness, a rotational and […]