Хонинговальные головки

By controlling the growth conditions, especially time and nucleation density, it is possible to grow much higher quality stones with well-defined crystal forms: cubic at low temperature, cubo — octahedra at intermediate temperatures, and octahedra at the highest temperatures. The diagram for growth morphologies of diamond is shown in Figure 5.9. The characteristic shape of […]

6.1 INTRODUCTION Wheel bond systems can be divided into two types: those holding a single layer of abrasive grain to a solid steel core, and those providing a consumable layer many grains thick with the abrasive held within the bond. The latter may be mounted on a resilient core or produced as a solid monolithic […]

5.11.1 Introduction Polyimide resin was developed by DuPont in the 1960s originally as a high-temperature lacquer for electrical insulation. By the mid 1970s, it had been developed as a cross-linked resin for grinding wheels giving far higher strength, thermal resistance, and lower elongation than conventional phenolic bonds. The product was licensed to Universal Diamond Products […]

Crush ratio can have a profound effect on the dressing action. Ishikawa and Kumar [1991] reported a study on dressing of vitrified bonded wheels containing coarse grade 80# GE 1 abrasive. They distinguished between three forms of grit fracture: “micro,” “medium,” and “macro” as illustrated in the micrographs in Figure 7.21. It was determined that […]

Grinding wheels vary enormously in design according to the purpose for which the wheel is to be used. Apart from the variety of abrasives already mentioned, there is the variety of bonds employed including plastic, resinoid, vitrified, metal bonds, and plated wheels. There is scope for engineering bond properties to achieve strength and wear behavior […]

3.1 SIGNIFICANCE 3.1.1 Introduction Knowledge of the basic principles of a process is a prerequisite for its effective improvement and optimization. During grinding, surface formation is one of the basic mechanisms. In the case of cutting with geometrically defined cutting edges, a singular engagement of the cutting edge defines the removal mechanism. The consequent removal […]

Grinding wheels come in a variety of shapes and sizes. Standard International wheel shapes and examples for conventional and superabrasive wheels are given in Table 4.1 and Table 4.2. Wheel dimensions are usually expressed as diameter (D) x thickness (T) x hole (H). For superabrasives the layer thickness (X) is added afterward. Conventional wheels are […]

As a final note, Ramesh [2001] reported using titanium flanges as a wheel mount option in a thesis on high-speed spindle design and grinding. This design is shown in Figure 4.24. The wheels are made with steel cores and without a center hole being held by titanium flanges clamping to shoulders on the wheel. Titanium […]

The quality and price of the diamond abrasive grain grade is governed both by the consistency of shape and the level of entrapped solvent in the stones. Since most of the blockiest abrasive is used in metal bonds processed at high temperatures, the differential thermal expansion of metal inclusions in the diamond can lead to […]

The hardness, or more accurately the wear resistance of the nickel, is controlled by changes to the bath chemistry. Nitride coating, similar to coatings used on cutting tools, has been reported to further improve the wear resistance of the nickel, but data have been mixed indicating that perfor­mance parameters are not yet understood [Julien 1994, […]