Хонинговальные головки

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 […]

Wheel manufacture of a high-speed segmented wheel consists of epoxy bonding or cementing a ring of vitrified CBN segments to steel core as shown in Figure 4.6. The segmented design serves several purposes. First, it produces a much more consistent product than a continuous or monolithic structure because of the limited movements required in pressing […]

The resultant abrasive is called brown alumina and contains typically 3% TiO2. It has a Knoop hardness of 2,090 and a medium friability. Increasing the TiO2 content increases the toughness but reduces hardness. Although termed brown, the high temperature furnacing in air required in subsequent vitrified wheel manufacture turns the brown alumina grains a gray-blue […]

Diamond is metastable at room temperatures and pressures and it will convert to graphite given a suitable catalyst or sufficient energy. In a vacuum or in inert gas, diamond remains unchanged up Premium long stones Lower quality/processed long stones to 1,500°C; in the presence of oxygen it will begin to degrade at 650°C. This factor […]

In addition to the size of the bond-bridge, the fracture mode is also critical. The bond must be strong enough to hold the grains under normal grinding conditions, but under higher stress it must allow the grain to fracture in a controlled way. The bond should not be so strong relative to the grit strength […]

The wear of single-point diamonds in profile dressing leads to problems with changing dress conditions because of the increasing cross section of the flat generated. The introduction of synthetic needle diamonds provides a solution in the form of a constant cross section. This type of tool has seen increasing usage as a replacement for higher […]

This discussion will consider first the dressing of conventional abrasive wheels with form diamond rolls. This can then be extrapolated to include vitrified CBN. The dressing process entails plunging the roll into the wheel at a fixed infeed rate in mm/min or mm/rev of wheel at a fixed crush ratio followed by a fixed dwell […]