Хонинговальные головки

The grinding wheel state is of substantial importance for the quality of the grinding results. The wheel condition can be described by the characteristics of the grains. Wear can lead to flattening, breakage, and even pullout of whole grains. Moreover, the number of cutting edges and the ratio of active/passive grains are of importance. Also, […]

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 […]

ELID grinding technique was used for the first time in Japan at the Riken Laboratories. The pioneers of this technique are Dr. Hitoshi Ohmori and Prof. Takeo Nakagawa. Dr. Ohmori’s new method is a result of the development over several years of the combined grinding and dressing technique for hard and brittle materials in an […]

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 […]

This unit shown in Figure 15.38 is a cantilevered hydraulic-powered dresser with three sleeve bearings for radial stiffness and two ABEC 7 thrust bearings for axial stiffness. It is a unit designed for heavy-duty plunge-dressing applications on internal grinders. Rolls can be counterbored to wrap around the spindle to accommodate up to 3 roll widths. […]

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 […]

For manufacturers that choose to rough machine the part, Thielenhaus [n. d.] provides a grinder/superfinisher to microfinish the faces to create a good sealing surface. This is particularly suited for applications such as aluminum cylinder heads with hardened liners that create step problems for machining. The process uses small conventional abrasive segments in a rotating […]

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 […]

This refers to a class of grinders that must have the flexibility to perform a range of grinding operations that may also include face and OD grinding in a broad range of parts. Multispindle (a) At load/unload position   (b) At grind position [Bryant (1995)]   FIGURE 18.22 Bryant UL2 loader for shoe centerless mode […]

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 […]