Хонинговальные головки

Most recently, automatic balancers have been developed for dynamic balancing in two planes for compensation of long wheels such as for through-feed centerless grinding or for complete wheel/spindle/motor assemblies. 4.3.5 Coolant Unbalance Coolant is a key factor for maintaining balance. A grinding wheel can absorb a considerable quantity of coolant (e. g., 220# WA 1A1 […]

The effect of wheel frequency on chatter was experienced first-hand by the author while developing a process for grinding large-diameter thin-walled casings with vitrified CBN. The project was initially prone to extreme chatter and noise. Maximizing the stiffness and nodal frequency of a steel-cored wheel by reducing the diameter by 30% and then doubling the […]

Even with the dramatic growth in synthetic diamond, the demand by industry for natural diamond has not declined. If anything, the real cost of natural diamond has actually increased especially for higher quality stones. The demand for diamonds for jewelry is such that premium stones used in the 1950s for single-point diamonds are now more […]

6.5.1 Application of Vitrified Bonds Vitrified bond alumina wheels represent nearly half of all conventional wheels and are employed for the great majority of precision high-production grinding applications. Vitrified superabrasive technology, especially for CBN, is the fastest growing sector of the precision grinding market but is still less than 20% of the market total. 6.5.2 […]

The resulting roughness is governed, in simplistic terms, by the height of profile S resulting from the overlap of the tool radius from one rotation of the wheel to the next. This height should always be less than the dress depth in order to avoid noncleanup of the wheel surface at each pass and a […]

Cross-axis dressing has often been considered a poorer dressing method. It has historically been applied to situations such as the retrofitting of older internal grinders from single-point diamond to rotary dressing where space does not allow a large-enough dresser spindle motor for the required torque to operate in a uniaxial orientation, or it is simply […]

2.2.1 Uncut Chip Thickness or Grain Penetration Depth The starting point for any discussion on grinding parameters is “uncut chip thickness,” hcu, as this provides the basis for predictions of roughness, power, and wear [Shaw 1996]. Uncut chip calculations are typically based on representations of the material removed in the grind process as a long, […]

Figure 3.4 summarizes different methods for measuring the topography of grinding wheels. In the case of the carbon paper method, white paper and carbon paper are put between the grinding wheel and a slightly conical, polished plastic ring. The grinding wheel topography is reproduced on the white paper by rolling the grinding wheel on the […]

1.4.1 Trend toward Higher Speeds Vitrified CBN wheel speeds have risen significantly in the last 10 years. In 1980, 60 m/s was considered high speed; by 1990, 80 m/s was becoming common in production; by 1995, the speed reached 120 m/s; and then by 2000, the speed was 160 m/s. At the time of this […]

3.1 INTRODUCTION Modem grinding abrasives mainly fall into one of two groups, namely, • Conventional abrasives based either on silicon carbide (SiC) or aluminum oxide (Alox), and • Superabrasives based either on diamond or cubic boron nitride (CBN). The division into two groups is based on a dramatic difference in hardness of the grains leading […]