Хонинговальные головки

The geometric function Gg(s) as illustrated in Figure 19.45 represents an inner feedback loop in Figure 19.43. The two feedback terms form circles when varying frequency. The larger circle in Figure 19.46(a) is the control wheel feedback and the smaller circle is the workrest feedback. If the two terms are added, the feedback locus is […]

Ultrasonic-assisted grinding with an oscillating wheel is divided into different process modifications. In the case of ultrasonic-assisted cross-peripheral grinding, the feed movement takes place vertically to the tool spindle axis and thus to the generated oscillation. With this process, grooves, gaps, and radii can be machined in brittle-hard materials. The feed movement in the case […]

The vibration behavior in cylindrical, internal, and surface grinding processes differ in significant ways [Inasaki 1977a]. In the case of internal and surface grinding, the chatter frequency is, in most cases, related to the natural frequency of the grinding wheel spindle system because the Amplitude ratio ycr/y   FIGURE 8.4 Geometrical interference.   dynamic stiffness […]

10.1 INTRODUCTION Coolant is a term generally used to describe grinding fluids used for cooling and lubrication in grinding. The main purpose of a grinding fluid is to minimize mechanical, thermal, and chemical impact between the active partners of the abrasion process. The lubricating effect of a grinding fluid reduces friction between the abrasive grains […]

The measurement of power consumption of a grinding spindle drive can be regarded as technically simple, but the evidence of this process quantity is definitely limited. The amount of power used for the material removal process is always only a fraction of the total power consumption. Never­theless, power monitoring is widely used in industrial applications […]

12.5.1 Introduction With the rapid advances in metalworking technology, it is now necessary, when selecting new machines, to go back to the basic fundamentals of processing a part. An analysis of capital and processing costs may well indicate that the traditional metal-cutting process for producing a given part may not be the most cost effective. […]

The actual cutting edges and points on abrasive grains at the wheel active surface are microcutting tools that interact with the workpiece material. The spatial distribution of abrasive grains over the wheel surface and their morphology comprise the grinding wheel topography. The grinding wheel topography and the macroscopic wheel shape are initially generated by conditioning […]

Slideways employing recirculating rolling elements were the salvation of the machining center man­ufacturers as a means of reducing manufacturing costs while increasing speed for high-precision circular interpolation with CNC controls. They also virtually eliminated stick-slip (u = 0.001 to 0.003) and accompanying loss of motion, without the need for expensive hydrostatic way designs. They were […]

Electric motors can be subdivided into three categories: traditional ac motors, ac servomotors with high — frequency drives popular since the early 1990s, and most recently dc brushless servomotors with high — frequency drives. The trend in these motors is to go to higher and higher power densities so as to be as compact as […]

High-performance deep grinding, with increased wheel peripheral speed and increased feedrate, is a special case requiring a cooling lubricant supply system adapted in terms of pressure and volume flow capability [Rowe and Jin 2001]. Application limits for high-performance grinding result from wheel safety requirements, that is, the maximum admissible peripheral speeds for grinding wheels. These […]