Хонинговальные головки

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 […]

The basic relationships for parameters such as removal rate, power, and grinding conditions are not in every case the same as for grinding between centers. The basic relationships for centerless grinding are as follows. 19.3.1 Depth of Cut The real depth of cut at the commencement of grinding is less than expected because of machine […]

Subject to achievement of quality levels, harder grits and bonds allow longer redress life and larger stock removal. The bond must not be too hard for the grinding operation and the grits should be sufficiently friable. Otherwise, grits eventually become blunt and are retained if grain forces rise to unacceptable levels. Blunt grits lead to […]

The machining-elasticity parameter K is a measure of the springiness of a grinding system. The parameter provides a convenient way to account for elastic deflections of the system due to grinding force. The use of the machining-elasticity parameter works best at frequencies well below the dominant resonant frequency of the system. K = true depth […]