Хонинговальные головки

This discussion deals only with the case of plunge feed, although the analysis has significance also for through-feed. Figure 19.34 defines position on the workpiece. A line of origin OX can be considered to rotate with the workpiece. Positions on the workpiece surface are defined by the angle from the line of origin. The position Read more

In addition to the concentrates, water composite cooling lubricants contain a high percentage of water. The properties of this cooling lubricant group are, therefore, crucially influenced by the quality of the mixing water used, upon which special requirements must be placed concerning the nitrate, chloride, sulphate, and phosphate content, total hardness, pH-value, and the microbial Read more

Iron or “ferrous” alloys are the most ubiquitous metals in industry today. They include numerous classes of cast iron, carbon steels, tool, alloy and stainless steels, as well as exotic materials for the aerospace, nuclear, and medical industries. In their oldest and simplest forms, iron alloys depend on their carbon content and composition. Cast iron Read more

A ballnut is the other mechanical part of the ballscrew system. Somewhat akin to linear ball-slide systems, ballnuts consist of a nut within which is a recirculating helical track for the bearing balls. There are a number of designs available with varying number of turns and internal or external recirculation of the balls, or with Read more

In creep feed grinding, surface roughnesses are much smaller due to the engagement of a higher number of cutting edges and due to smaller feedrates than in the case of reciprocating grinding. Since the functional surface properties of a workpiece are often important, creep feed grinding has a clear advantage here. This can be traced Read more

Camlobe grinding has been the leading driver of high-speed grinding over the last 25 years. It is a high-cost process, making up more than 40% of total camshaft manufacturing costs [Wedeniwski 1989]. The operation is very capital-equipment intensive resulting in pressures from end users to reduce cycle times while offering machine tool builders sufficient end Read more

A different problem can arise with heavy workpieces if there is insufficient control wheel friction to turn the workpiece on contact with the grinding wheel. Heavy workpieces are unlikely to suffer the problem of “spinning.” In fact, heavy workpieces are more likely to suffer the problem of failing to turn at all under the action Read more

Substituting s = jm in Equation 19.76, it is possible to solve the characteristic equation to find the unstable limit frequencies and the corresponding limits of grinding force stiffness at the threshold of instability. Noting that m = n. Q., the frequencies are given by where A and B are the real and imginary parts Read more

The development of regenerative chatter amplitude in cylindrical grinding is schematically illus­trated in Figure 8.2. When the workpiece velocity is extremely high, of the order of some 10 m/min, or the chatter frequency is low, vibration with large amplitude can be observed at the beginning of grinding even if a newly dressed grinding wheel is Read more

As with all manufacturing processes, ideally, the variables of greatest interest are measured directly as close to their origin as possible. Grinding processes are affected by a large number of input variables that each influence the resulting output quantities. Brinksmeier [1991] proposed a sys­tematic approach to distinguish between different types of quantities to describe a Read more