Хонинговальные головки

Monocrystalline silicon enjoys a prominent role as the foundational material in the manufacture of microelectronic semiconductor components due to their favourable physical and chemical properties, comparatively cheap price and nearly limitless availability. Silicon crystallises in the diamond lattice, which can be described with two in­terpenetrating face-centered cubic elementary cells that are shifted in each direc­tion […]

Especially for vitrified bonded grinding wheels, the chip space can often also be enlarged by so-called free grinding. The basic prerequisite for this is the self — sharpenability of the grinding wheel. In the free grinding process, the grinding wheel topography is adjusted to the demands of the subsequent grinding process by means of a […]

External cylindrical peripheral plunge grinding, also called external cylindrical in­feed grinding, is utilised for machining bearing carriers, shaft cranks and grooves. Fig. 6-35 shows the schematic arrangement of the grinding wheel, workpiece spindle and the dressing spindle as well as the axes and the direction for the feed setting. The infeed can be subdivided into […]

The available volume treats machining with geometrically undefined cutting edges. It approaches both the practical engineer and the student of engineering sciences. This book is based on the lecture “Manufacturing Technologies I and II” and the pertinent exercises, which are held at RWTH Aachen University. The ar­rangement of the book results from the experiences, which […]

The most dominant group of diamond abrasives by far are those manufactured synthetically. Carbon in graphite form serves as the raw material. Synthesis is car­ried out at pressures of 70 to 120 kbar and temperatures around 2000 °C in the presence of metallic catalysts. In accordance with an appropriate choice of synthe­sis conditions, e. g. […]

The determination of the amount of wear of the grits and the bond of grinding wheels is very difficult. Approaches to this are based on the ascertainment of theforce required to detach a grit from the bond. With this method, bond strength be­comes quantifiable. For the execution of the grit break-out experiment, a sharpened carbide […]

The carbon content of nitrided steels lies between 0.2 and 0.45 %. They are heat — treatable and are alloyed with Cr and Mo (for improved hardenability) as well as with aluminium or vanadium (nitride formers). Typical nitrided steels and their re­spective compositions are shown in table 4-4. Nitriding is carried out at tempera­tures between […]

5.1 Principles of Cooling Lubricants in the Grinding Process 5.1.1 General Functions The shearing, cutting and rubbing processes involved in grinding generate large heat flow, which can only be removed to a small extent with the chips and thus can lead to considerable thermal stress on the workpiece and the tool [GROF77, LOWI80]. In grinding, […]

Dressing with Small Depths of Dressing Cut — Touch Dressing Grinding wheel topography influences the quality of the ground workpiece surface to a major extent. For example, individual grits projecting from the envelope of the grinding wheel bond lead to high workpiece roughness in the ground compo­nent. Such conditions can be observed especially in the […]

External cylindrical form grinding is a technique variant of external cylindrical pe­ripheral longitudinal grinding. By overlaying the main axial feed movement with an additional radial feed movement, under NC operation, various rotation — symmetrical workpiece geometries can be produced. The goal of this technique is to finish grinding the workpiece in one clamping. For this […]