Рубрика: Manufacturing Processes 2

Process Design

In order to make a sufficient analysis of the grinding process, a number of influ­ences must be taken into account, and their relevance of their respective effects on the process must be evaluated. Some essential input parameters are the grinding tool, the workpiece to be machined, the variables as well as influences derivable from cooling […]

Planar Lapping

Planar lapping is used to create flat surfaces with high surface qualities. Two method variations are distinguished. In the first case, the workpieces are freely movable and are guided over the lapping disc; in the second case they are placed in so-called carriers with restricted guidance in order to avoid reciprocal damages. The workpieces are […]

Centreless Plunge Grinding

As precision components in internal combustion engines, valves control the neces­sary gas flow by blocking cross-sections of flow. While inlet valves are subject mainly to mechanical stresses, outlet valves are also exposed to thermal stress and chemical corrosion. Valves are therefore manufactured from various materials de­pending on their function. In the case of many high-stress […]

Zonal Polishing Methods

Three components are necessary for zonal polishing (Fig. 8-21): • The use of a suitable measurement technique is necessary to measure the re­spective surface topography. The data are compared to the target geometry so the respective fault profile can be acquired. Interferometric methods find par­ticularly broad use for the measurement of geometries. • The measured […]

Cutting with Unbonded Grain

Cutting wire lapping (Fig. 9-11) is these days the dominant and most widespread technique. It is used especially in mass markets. Although this method has been utilised industrially for some time, knowledge of the process is still mostly of an empirical nature. Theoretical findings and process models exist only to a limited extent and are […]

Double-Disc Coplanar Lapping

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 […]