Хонинговальные головки

Direct comparison of the performance of SG and Cubitron is difficult because the grain is merely one component of the grinding wheel. SG is harder (21 GPa) than Cubitron (19 GPa). Anecdotal evidence in the field suggests that wheels made from SG give longer life but Cubitron is freer — cutting. This can make Cubitron […]

The hardness of CBN at room temperature is approximately 4,500 kg/mm2. This is about half as hard as diamond and twice as hard as conventional abrasives. 5.7.7 Wear Resistance of CBN The differences in abrasion resistance are much more extreme. A hardness factor of 2 can translate into a factor of 100 > 1,000 in […]

6.7.1 Introduction When CBN was introduced into the market in 1969, its cost naturally lent itself to being processed by wheel makers that knew how to handle expensive abrasive — namely, diamond wheel makers — using the dense hot-pressed vitrified systems described above. Unfortunately, these had none of the properties, such as chip clearance and […]

7.4.1 Introduction Rotary diamond tools were the industry’s answer to life issues with stationary tools and are in many ways the rotary equivalents to single points, blades, grit tools, and form blocks. A rotary diamond tool (also called “truer,” “dresser,” or “roll”) consists of a disc with diamond in some form held on the periphery […]

Out-of-balance and eccentricity of the grinding wheel are the main causes of forced vibrations [Inasaki and Yonetsu 1969, Gawlak 1984]. The wheel, as a source of vibration, can be relatively easily identified through frequency measurement. The main concern with wheel-induced vibration is how to eliminate out-of-balance and wheel runout. There are a number of other […]

Grinding, once considered primarily a finishing operation involving low rates of removal, has evolved as a major competitor to cutting, as the term “abrasive machining” suggests. This is what Milton Shaw, the man who is considered the great pioneer and father of American grinding, said about 10 years ago. Shaw led the development of grinding […]

When the infeed reaches its final feed point, the grinding force F will change with time t as the system relaxes according to the equation Ft and power are directly related; therefore t can be determined from a log plot of the decay in power during spark-out. After 3t virtually all grinding has ceased, preventing […]

When a scratching tool enters a fine-grained material, an entry section is formed by pure plastic deformation. The length of the entry section strongly depends on the corner radius of the diamond. If the material-specific shear stress is exceeded due to increasing scratching depth, a permanent deformation occurs thrusting aside the material and causing bulgings […]

With high-speed steel-cored wheels the need for blotters is eliminated. Clamping is, therefore, steel on steel and not prone to the same brittle failure from stress risers. Nevertheless, there is the uncertainty on wheel contraction and its effect on clamping. One solution is to eliminate the flanges entirely. Landis (Waynesboro, Pennsylvania) developed a one-piece wheel […]

With time, it is expected that SG, TG/TG2, Cubitron, and other emerging chemical precipitation/sin — tering processes will increasingly dominate the conventional abrasive market. The production of electrofused product is likely to shift more and more from traditional manufacturing sites with good availability of electricity, such as around the Great Lakes of the United States […]