8.6.1 Modeling of Dynamic Grinding Processes A mathematical model of dynamic grinding process can be established taking the factors shown in Figure 8.6 into account. The characteristic parameters in grinding dynamics, which are not generally necessary to consider in cutting dynamics, are the contact stiffness of the grinding wheel and the grinding damping. A comprehensive […]
Рубрика: Handbook of Machining with Grinding Wheels
TYPES OF GRINDING FLUIDS
Grinding fluids are commercially available with different property profiles to meet the requirements of specific machining tasks. DIN 51 385 divides grinding fluids into • Water-immiscible • Water-miscible • Water composite fluids The more general fields of application of cooling lubricants are cutting and partial forming processes [DIN 51 385]. Water-immiscible cooling lubricants are generally […]
Acceleration Sensors
In abrasive processes, the major application for acceleration sensors is related to balancing systems for grinding wheels. Especially large grinding wheels without a metal core may have a significant unbalance at the circumference. With the aid of acceleration sensors, the vibrations generated by this unbalance are monitored during the rotation of the grinding wheel at […]
Multitasking machines for hard-turning with grinding
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 […]
PHYSICS OF GRINDING CERAMICS
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. […]
LINEAR AXIS DRIVES AND MOTION CONTROL
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 […]
POWER AND STIFFNESS REQUIREMENTS FOR ROTARY DRESSERS
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 Influence of the Set Parameters in Creep Feed Grinding
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. Introduction
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. […]
Coolant Drag and Nozzle Design in High-Speed Grinding
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 […]