Хонинговальные головки

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 […]

Floor construction is a critical consideration when installing a new grinder. It must first and foremost be capable of supporting the weight without deforming. It should also absorb shock and isolate the machine from adjacent machine noise. The principles of vibration isolation of machines are described in detail by Den Hartog [1956]. For light machines, […]

Spindle design and selection can be categorized by the type of wheel and operation into: • Large wheel applications using conventional wheels • Small wheel applications limited by burst speed and dynamic issues in grinding • High-speed grinding • Specialty applications In many cases, one area overlaps with another, especially where a machine tool builder […]

A mini double-barrel hydraulic-mechanical compensator for medium-sized grinders is shown in Figure 15.49. The system is equipped with a DFW-HO hydraulic spindle. 15.18.3 Double-Barrel Infeed Carrier The double-barrel infeed carrier in Figure 15.50 has a hydraulic-mechanical compensator. It is suitable for plunge form dressing on machines such as centerless grinders. FIGURE 15.50 Hydraulic-mechanical compensator infeed […]

Since coolant is such a key factor in continuous dressing (CD) grinding, close attention must be paid to all aspects of the coolant delivery system. Most creep feed applications either have □ Water soluble A Oil О Air   FIGURE 16.10 Illustrations of the impact that film boiling has on workpiece surface temperatures. (From Howes […]

The selection of the appropriate technology for generating parts in the flatness range of 0.5 to 2 pm is becoming quite subtle. Technological advances in both processes are accelerating. The view just 5 years ago was that fine grinding held the better flatness but double disc held the better size control. However, with Koyo’s development […]