Хонинговальные головки

CDCF is characterized by high stock-removal rates. Deep slots with stock levels of the order 10-mm values of Q of over 100 mm3/mm/s have been reported for both steels and nickel-based materials. However, in actual production due to limited stock levels, access of coolant, or dimen­sional or thermal stability of the part, the removal rates […]

The previously shown description of path types during machining on double-wheel lapping and fine grinding machines reveals a very broad range of the rotational speed ratio. This theoretical analysis 1 A в Ahw = Constant Ah’w = f(ij) FIGURE A16.6 Necessary rotational speeds to achieve a mean path velocity of 50 m/min at different rotational […]

The first and most important decision in recent years is the choice of whether to use conventional, ceramic, or cubic boron nitride (CBN) abrasive. This will depend on the condition of the machine, dressing capability, and part size. In general, high volume, hardened-steel parts under 15 mm with straight bores, for example, tappet rollers, lifter […]

The basic relationships for parameters such as removal rate, power, and grinding conditions are not in every case the same as for grinding between centers. The basic relationships for centerless grinding are as follows. 19.3.1 Depth of Cut The real depth of cut at the commencement of grinding is less than expected because of machine […]

Subject to achievement of quality levels, harder grits and bonds allow longer redress life and larger stock removal. The bond must not be too hard for the grinding operation and the grits should be sufficiently friable. Otherwise, grits eventually become blunt and are retained if grain forces rise to unacceptable levels. Blunt grits lead to […]

The machining-elasticity parameter K is a measure of the springiness of a grinding system. The parameter provides a convenient way to account for elastic deflections of the system due to grinding force. The use of the machining-elasticity parameter works best at frequencies well below the dominant resonant frequency of the system. K = true depth […]

Set-up geometry should provide rapid rounding and avoid convenient waviness. • Convenient waviness and marginal stability cannot be completely avoided. However, convenient waviness is unlikely to be a problem unless waviness is forced by vibration at the same frequency. • Static compliance in the system softens the imposition of errors into the workpiece and, hence, […]

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 […]