Хонинговальные головки

9.1.3 Abrasive Cutting Abrasive cutting assumes the function of cutting lengths of bar steel and profiles especially in rolling mills, but not rarely in forges and continuous casting plants as well. In these contexts it competes with guillotine shears and sledge saws. In the face of improved cutting quality as well as the possibility of […]

As industrial praxis shows, in the case of complex monitoring systems there are frequent false alarms due to the dynamic and stochastic behaviour of the manufac­turing process. Thus, such systems are not always accepted in operation; they are then shut off by the machine operator. Many research centres around the world [BARS91, INAS93, MORI93, WECK95] […]

6.3.5.1 Kinematic Fundamentals According to DIN 8589 [DIN78a], there are many different variations of belt grinding, of which only the most important are indicated in Fig. 6-64. The main factors in classifying them are on the one hand the position of the feed motion characterising the method, and on the other the contact element (roller […]

Grinding Wheel Selection The primary considerations in choosing grinding wheel specifications for a par­ticular machining task are the grindability of the material and the output require­ments. From grinding wheel specifications, information regarding their appropri­ateness for a specific machining task can be derived. Grain type is selected especially with a view to hardness, toughness and prone­ness […]

Stroke length lH has a considerable influence on shape accuracy in longitudinal stroke honing. More than in roundness errors, lH plays a decisive role in cylindric — ity errors. The larger the stroke length, the more the hole is widened at the ends. Fig. 7-15 provides a schematic illustration of the contour of a hole […]

Accessories used in lapping are dressing rings and workpiece receivers, as well as devices used to weigh down or remove weight from the workpieces and supply equipment for providing lapping slurry. The dressing rings located on the machin­ing disc are supported by lateral guide arms with rollers and receive rotary motion through friction locking when […]

The production of silicon discs, so-called wafers, with the highest quality stan­dards is an essential part in the manufacturing chain of semiconductor devices. Proceeding from up to two metre long ingots, the semi-finished monocrystalline silicon product, individual wafers with a thickness of less than a millimetre are separated in a cutting operation. For example, the […]

The primary variable of this variant is normal force with which the workpiece is pressed against the grinding belt. The depth of cut is a result of the amount of pressure force, the abrasive belt’s topography, the component material and other process variables like the cutting and workpiece speeds. The pressure force is related to […]

The wear processes on the abrasive grain and the bond described in chapter 2.4 lead to changes to the tool topography during the grinding process. At the beginning of the process, a rough grinding wheel surface with a multi­tude of sharp grain cutting edges at varying cutting edge depths can be observed. In the course […]

The work result, especially workpiece roughness, is dependent in particular on the machining time. The roughness, resulting from pre-machining has to be improved by the honing process and leads to a typical temporal course (Fig. 7-18). Initially the peaks of roughness are removed quickly. After a relatively short machining time, the surface roughness asymptotically approaches […]