Хонинговальные головки

Additives are employed to modify the properties of alumina as described below. Examples of additives include chromium oxide, titanium oxide, zirconium oxide, and vanadium oxide. 5.4.3 Pink Alumina The addition of chromium oxide produces pink alumina. White alumina is alloyed with <0.5% chrome oxide to give the distinctive pink hue of pink alumina. The resulting […]

The reactivity of diamond with transition metals such as nickel and iron is a major limitation to the use of diamond as an abrasive for machining and grinding these materials. Thornton and Wilks [1978, 1979] showed that certainly in single-point turning of mild steel with diamond, chemical wear was excessive and exceeded abrasive mechanical wear […]

The primary attraction for producing wheels with high structure numbers is to allow the highest levels of porosity to be produced while still maintaining structural integrity. This provides for very good coolant access and chip clearance in the grinding process. However, it is very difficult to maintain green strength and the integrity of the pores […]

Prior to the introduction of synthetic needles natural long stones were used. These have trade names such as the Fliesen tool from Winter (Saint-Gobain Abrasives). Some tools of this style have multiple layers of diamonds to maximize tool life, but care needs to be taken in their design to avoid changes in dress behavior when […]

Hitchiner [1998, 1999] gives typical parameters for dressing of CBN wheels for grinding aircraft blades and vanes. Crush ratio values of +0.6 to +0.8 are used as for conventional wheels but infeed rates are limited to 0.1 to 0.25 mm/min or 0.03 to 0.20 pm/rev, which are 10 times less than for conventional wheels. On […]

Surface roughness, not surprisingly, is closely related to uncut chip thickness. RT Roughness Rt roughness is the SI parameter for maximum surface roughness, the maximum difference between peak height and valley depth within the sampling length. As a first approximation, Rt is independent of depth of cut but is dependent on vw, vs, C ■ […]

3.5.1 Microplowing, Chipping, and Breaking The removal process during the engagement of an abrasive cutting edge on the surface of a workpiece mainly depends on the physical properties between the active partners. A basic distinction can be made between three different mechanisms: microplowing, microchipping, and microbreaking (Figure 3.7). In microplowing, there is a continual plastic, […]

Segmental wheel research first began with conventional wheels in the 1970s as part of an effort to evaluate the effect of high speed [Yamamoto 1972, Anon 1979, Abdel-Alim, Hannam, and Hinduja 1980]. However, the labor-intensive manufacturing costs were not competitive for the economic gains in productivity possible at that time. However, the recent development of […]

Grain growth is closely controlled in a sulphide matrix. The alumina is separated out by acid leaching without crushing. The grain shape is nodular, which aids bond retention, while the elimination of crushing reduces mechanical defects from processing. 5.4.6 Postfusion Processing Methods As mentioned above, the type of particle reduction method can greatly affect the […]

3.4.6 Development of CBN CBN is the final and most recent of the four major abrasive types, and the second hardest super­abrasive after diamond. Trade names include Borazon (from GE who first synthesized it commer­cially), Amborite and Amber Boron Nitride (after De Beers), or in Russian literature as Elbor, Cubonite, or P-BN. Boron nitride at […]