Хонинговальные головки

As discussed above, the problem with double-disc grinding is generating and maintaining flatness. This is either from the inherent limitation of trying to generate a flat surface while through-feeding into a wedge grind zone, or in the case of the slower infeed methods, maintaining a flat wheel with large differentials in surface footage from the […]

The roll grinding market covers an incredibly broad range of applications from rolls for business machines of just an inch or less in diameter to rolls for the steel industry that can weigh up to 50 tonnes. Workpiece materials include rubber, aluminum, steel, cast iron, ceramics, granite, and exotic metals and polymers. Often finish requirements […]

19.2.1 External Centerless Grinding Centerless grinding is compared with between-centers grinding in Figure 19.1. In center grinding, the workpiece is located on center by means of center holes drilled in the workpiece. In centerless grinding, the workpiece is located on the workpiece perimeter. This can be a significant advantage for achieving part roundness. However, if […]

The control wheel spindle bearings were the most compliant element in the force loop compliances shown in Figure 19.18. The plain hydrodynamic bearings of the control wheel spindle are shown as Element F1. Plain hydrodynamic bearings are reliable over a long period, but at low speeds they exhibit low and variable compliance The compliance becomes […]

Based on the reasoning discussed before, three conditions can be established. If 180°-в gives a half-wavelength, 360° gives a multiple of a whole wavelength, and a gives a multiple of a whole wavelength, waviness will persist. These three conditions follow. The number of waves, n, is an integer. where n1 and n2 are other integers. […]

Down boundaries were colored red in Figure 19.56. Unstable zones for down boundaries lie beneath the line and stable zones above the line. Down boundaries indicate unstable zones for increasingly negative grinding forces and stable zones for more positive forces. In a case where a down boundary lies in the negative region of the chart, […]

The ultimate goal of research is to develop practical means for suppressing vibrations. Based on understanding of the chatter principle, a number of practical methods have been proposed. The methods can be categorized into one of three strategies shown in Figure 8.16: • Modification of the grinding conditions, • Increase of the dynamic stiffness of […]

The cooling lubricant supply system is required to accomplish several different tasks during the machining process as well as during auxiliary process time or even during the off-state of the grinding machine. First of all, it has to provide an uninterrupted flow of cooling lubricant to the active zone. Moreover it is required to store […]

The determination of microgeometrical quantities on a moving workpiece by using contacting sensor systems is a challenging task. A permanent contact of any stylus to the surface is not possible because the dynamic demands are much too high. Only intermittent contacts can be used to generate a signal, which should be proportional to the roughness. […]

Heat-resistant superalloys (HRSA) are based on high levels of nickel, chromium, and/or cobalt. In many cases, iron, as an alloying element, may be almost or entirely absent. These are the workhorses FIGURE 13.6 Major classes and examples of heat-resistant superalloys. of the aerospace engine and land-based power generation industries. Their superior ability to retain strength […]