Хонинговальные головки

Adhesion wear is based on an atomic bond at a microcontact surface between the active partners of the wear process through microwelding. This bond is very strong, which means that shearing through the relative movement of the active parts takes place at a different place than that of the original microcontact surface. Chemical adhesion is […]

At present, the most common type of cooling lubricant nozzle is the free jet nozzle aimed at flooding the entire contact zone. Being rather simple in design, this nozzle type is oriented in the tangential direction to the grinding wheel. In addition, the nozzle outlet should be positioned very close to contact zone. By varying […]

All the mentioned restrictions of contacting sensor systems on the workpiece surface gave a significant push to develop noncontact sensors. As for grinding wheels again, optical systems seem to have a high potential. In Figure 11.22, different optical systems as well as two other noncontacting sensor principles are introduced. A laser-scanner is shown as a […]

14.1 INTRODUCTION This chapter discusses factors affecting the grinding of the new generation of hard engineering ceramics. Particular attention is drawn to effects on predressing time and surface quality. Electrolytic in-Process Dressing (ELID) grinding is introduced as an exciting new process used for machining a range of very hard materials and, in particular, for machining […]

Slideways traditionally refer to a range of linear sliding contact guideways based on square, T, or flat and V cross sections. In recent decades, the advent of NC and CNC machines has led to rolling element slideways for ease of positional control. Table way   Hand-s V and fl   Base cast   FIGURE 15.6 […]

For applications demanding the greatest stiffness, damping, and power handling requirements with minimal runout, many machine tool builders choose hydrostatic bearings. A hybrid hydrostatic bearing can provide greater load support than many hydrodynamic bearings of the same diameter and can withstand crashes better than other bearing types; a significant issue when using steel — cored […]

Figure 15.56 shows a traverse diamond roll unit with a small double-barrel stepper motor infeed and a dc motor cross-slide and DFW-HTG spindle. This carrier is designed for traverse dressing of CBN and engineered ceramic wheels. 15.18.9 Plunge-Roll Infeed System for a Creep-Feed Grinder Figure 15.57 shows a plunge roll infeed system for a Brown […]

CDCF is characterized by high stock-removal rates. Deep slots with stock levels of the order 10-mm values of Q of over 100 mm3/mm/s have been reported for both steels and nickel-based materials. However, in actual production due to limited stock levels, access of coolant, or dimen­sional or thermal stability of the part, the removal rates […]

The previously shown description of path types during machining on double-wheel lapping and fine grinding machines reveals a very broad range of the rotational speed ratio. This theoretical analysis 1 A в Ahw = Constant Ah’w = f(ij) FIGURE A16.6 Necessary rotational speeds to achieve a mean path velocity of 50 m/min at different rotational […]

The first and most important decision in recent years is the choice of whether to use conventional, ceramic, or cubic boron nitride (CBN) abrasive. This will depend on the condition of the machine, dressing capability, and part size. In general, high volume, hardened-steel parts under 15 mm with straight bores, for example, tappet rollers, lifter […]