Хонинговальные головки

Equivalent wheel diameter, de, is a parameter that takes into account the conformity of the wheel and the workpiece in cylindrical grinding and gives the equivalent wheel diameter for the same contact length in a surface grinding application (i. e., de ^ ds as dw ^ ^). The plus sign is for external cylindrical grinding, […]

Microscopic processes can, however, also be used to make quantitative statements on the state of the grinding wheel effective area. For this purpose, grains or different wear characteristics were statically counted [Buettner 1968, Bohlheim 1995]. The measurements are either carried out directly on the grinding wheel surface or indirectly on a print of the surface. […]

Wheel failure, in line with this analysis, occurs from cracks generated at or near the bore where the stress is highest. The failure is catastrophic with conventional wheels. Typically four or five large, FIGURE 4.6 Segmented vitrified CBN wheels and molded segment cross sections. (Courtesy of Saint-Gobain Abrasives. With permission.) highly dangerous pieces are flung […]

Alumina-based abrasives are derived either from a traditional route of electrofusion, or more recently by chemical precipitation and/or sintering. Unlike SiC, alumina is available in a large range of grades because it allows substitution of other oxides in a solid solution, and defect content can be much more readily controlled. The following description of alumina-based […]

More important than hardness is mechanical wear resistance. This is also a difficult property to pin down because it is so dependent on load, material, hardness, speed, and so on. Wilks and Wilks [1972] showed that when abrading diamond with diamond abrasive, wear resistance increases with hardness but the differences between orientations are far more […]

With the abrasive volume defined, the remaining volume is shared between the bond and porosity. The bond bridges can obviously be strengthened by increasing the amount of bond to make them thicker. The greater the amount of bond present, the lower the porosity and the harder the wheel will act. The actual definition of Grade […]

Tools are available called “Rotoheads” or Norton’s “U-dex-it” that are specifically designed so that the head can be rotated without loosening the tool in the holder. The diamond is centrally positioned in the holder to within 25 pm. 7.2.9 Profile Dressing Tools For profiling applications, chisel-shaped tools with well-defined radii are used. These are used […]

For RPC rolls, the coated mold is placed in a nickel-plating tank and a shell of nickel is allowed to build up around the diamond. The plating process can take up to a month in order to avoid internal stresses or gassing, and to allow the contour to be faithfully followed. After this time, a […]

Specific grinding energy, ec (or u in older publications), is the energy that must be expended to remove a unit volume of workpiece material. The units are usually J/mm3 or in. lb/in.3; conversion from metric to English requires a multiplication factor of 1.45 x 105. Analysis of the energy to create chips leads to the […]

The topography of the grinding wheel can be depicted in a control workpiece. For this purpose, a mirroring workpiece angled diagonally to the grinding direction is ground once. Counting the scratch marks, a conclusion can be drawn to the number of active cutting edges per unit surface area. Since the scratch marks of successive cutting […]