Хонинговальные головки

Forced vibrations may occur in stable systems and do not imply chatter or instability. Forced vibrations occur due to the action of the normal machine forces. Examples of forced vibrations are the vibrations forced by grinding wheel unbalance, motor unbalance, uneven belt drives, OOR of the wheel spindles, and cyclic forces due to worn or […]

According to the process variant, a supersonic oscillation is superimposed in the contact zone either vertical or parallel to the workpiece surface in addition to the conventional cutting movement. This change in the speed ratios and in the resultant cutting speed leads to functional and wear mecha­nisms, which are basically different from those of conventional […]

The development of regenerative chatter amplitude in cylindrical grinding is schematically illus­trated in Figure 8.2. When the workpiece velocity is extremely high, of the order of some 10 m/min, or the chatter frequency is low, vibration with large amplitude can be observed at the beginning of grinding even if a newly dressed grinding wheel is […]

8.4.1 Introduction Not only the abrasive grain, but also the grinding wheel bond is increasingly subject to wear. The reason is abrasion by ground material particles, which have an abrasive effect on the binding material. With increasing wear, the bond is set back. In the case of long-chipping materials, this bond damage may occur at […]

As with all manufacturing processes, ideally, the variables of greatest interest are measured directly as close to their origin as possible. Grinding processes are affected by a large number of input variables that each influence the resulting output quantities. Brinksmeier [1991] proposed a sys­tematic approach to distinguish between different types of quantities to describe a […]

12.3.1 Introduction Total in-process costs may be only half the analysis. For new processes, consideration needs to be given to balance capital equipment costs against operating costs. 12.3.2 Automotive Camlobe Grinding Example An example of this was the introduction in the late 1980s of CBN to grinding camshafts. After the initial installation, which was instigated […]

14.3.1 The Type of Diamond Abrasive Diamonds, used for grinding ceramics, are mainly synthetic diamonds. The synthesis process permits control of diamond characteristics generating either blocky grit shapes with very high impact strength, or friable grits with low-impact strength. Diamonds are also classified by grit size and grit size distribution. The grit system can be […]

A simple double diaphragm valve design was developed by Rowe [1969, 1970] for hydrostatic slideways and for hydrostatic journal bearings. Designs of this type have been successfully imple­mented in various machine tools and give very high bearing stiffness. FIGURE 15.15 Bryant UL2 hydrostatic round slideway designs. The pressures at the individual pads can nowadays be […]

15.14.1 Hydraulic Spindle Drives Although much of the interest is in new and emerging technologies, many machines remain in the field built 30 or more years ago. Very often, aspects of an older technology will linger because it has proved such a practical or reliable method. A case in point is the use of gerotor […]

Reciprocating grinding without cross-feed is employed either for slot grinding or for generating a profile with a preformed wheel. The dresser is usually table mounted and for a conventional wheel may consist either of a simple single point or form block at the end of the slide or of a driven spindle with a form […]