Хонинговальные головки

Hard turning can remove stock much faster and with lower forces than regular grinding processes but it cannot hold quite the tolerances and finishes of grinding. However, when combined in a single machine with a single chucking the two processes can enhance each other. The photographs in Figure 12.4 show an operation to process two […]

The material-removal rates in grinding of ceramics vary widely depending on the application (Figure 14.5). With recent advances toward understanding of the mechanics of grinding ceramics, it is possible to achieve material-removal rates comparable to that in metal grinding. However, current practice achieves only about a tenth of these material-removal rates. FIGURE 14.6 Surface contact. […]

15.7.1 Introduction Motion control is the technology required to drive the carriages on the machine slideways and ensure that the motion is correct. Glancing through any used machinery brochure, it is easy to understand the changes that have occurred in the design of machine tools over the last 25 years. In no area is this […]

A review of some commonly available dresser spindles, sold to machine tool builders and as retrofits for grinders previously using single point dressing, gives a good indication of the power require­ments and hence stiffness. Table 15.2 lists the capacity of various Wheel Dressing and Norton (Divisions of Saint-Gobain Abrasives) dressing spindles. The first observation is […]

The most important setting parameters in creep grinding are cutting speed, vc, tangential feedrate, vft, and infeed, ae. Either up — or down-cut grinding can be set in creep feed grinding. The influence of the setting parameters on the work result will be explained below. 16.3.4.1 The Influence of Cutting Speed vc Due to the […]

Face grinding is surface grinding using the face of a grinding wheel. Face grinding may be contrasted with the previous examples in this chapter in which grinding was performed predominantly with the peripheral surface of the grinding wheel. Face grinding encompasses a range of processes characterized by a total conformity between the wheel and workpiece. […]

A major drawback with higher wheel speeds is the increased demand for nongrind power. This relates, in part, to the increased frictional drag on the spindle. However, a far more significant factor is coolant drag on the wheel. The whole issue of coolant at high speed is problematic. Direct matching of coolant flow to wheel […]

This refers to a range of products using wheels in the 5- to 25-mm-diameter range to grind extremely high volumes of components on dedicated grinders. Tolerances now become somewhat relaxed compared with those for fuel injection and fall in the 1 to 5 pm range. The key to these machines, though, is cycle time, much […]

19.5.4.1 Dressing Geometry The axis of the control wheel is inclined at an angle, Ф, sufficient to provide traction in the axial direction. A small angle is employed for plunge grinding and a larger angle for through grinding as explained previously. This means the axis of the control wheel is not parallel with the axis […]

Three grinding wheels listed in Table 19.5 were each tested using an L827 orthogonal array to determine the most favorable conditions. The aluminum oxide wheel listed having 42% porosity gave better results than a number of other aluminum oxide wheels tested for grinding Inconel 718. The CBN wheels listed also had increased porosity, 40% compared […]