Хонинговальные головки

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 […]

19.10.9.1 AISI 52100 Steel Five grinding wheels were employed for easy-to-grind bearing steel AISI 52100. The wheels are listed in Table 19.4. The medium-speed wheels were larger than the high-speed wheels as indicated in Table 19.3. A two-level experimental arrangement for eight factors based on an L1628 array was used to determine the best conditions […]

The effect of the frequency response function for machine system compliances can be demonstrated using a second-order single degree of freedom system defined by

A simplified linear dynamic grinding system can be represented by masses, springs, and elements. Based on the following simple grinding force model, which says that the normal grinding force Fn is proportional to the material removal rate damping (8.3)   where X is constant, b is grinding width, vw is workpiece speed, vs is grinding […]