Хонинговальные головки

Costs for grinding AISI 52100 were compared for the best conditions found for each grinding wheel and speed condition. The results are presented in Figure 19.31. An A60-SG abrasive designed for high removal rates gave the same quality level and reduced costs compared with conventional alumina abrasives. Vitrified CBN allowed an even higher removal rate […]

Application of the equations and rules in Section 19.13.1 allows dynamic stability charts to be plotted. The following case study illustrates the application and interpretation of dynamic stability charts. A dynamic stability chart gives the ratio of grinding stiffness to static machine stiffness at the limit of stability. In grinding, it is usually found that […]

The stability limit of the self-excited chatter vibration in plunge grinding can be obtained by substituting s = jrn into the characteristic equations based on Figure 8.7 and Figure 8.8. Influence of the depth of cut, the workpiece speed, and the grinding width on the stability limit is illustrated in Figure 8.11 [Inasaki 1977a] for […]

Tangential grinding force and grinding power can be minimized and generated heat reduced by reducing friction using a cooling lubricant with a strong lubricating effect [Howes 1990, Brinks — meier 1991a]. Successful cooling leads to quick heat dissipation keeping the active partners below a critical temperature. However, the shear resistance of the workpiece material is […]

The loading of a grinding wheel with conductive metallic particles is a special type of microgeo­metrical wear that can be detected using sensors based on inductive phenomena. The sensor consists of a high permeability core and a winding. It is positioned a short distance from the surface. The metallic particles generate a change of impedance, […]

The simplest, and cheapest, steels are plain carbon steels having no other alloying element. As the carbon content is increased, the ductility is reduced while the maximum hardness is increased up to about 63 HrC (Figure 13.3). Plain carbon steels are identified in the AISI or SAE four digit code system by 10xx where the […]

Most machine tools are lightly damped [Tobias 1965]. Typically, the damping ratio is approximately 0.05 to 0.15. Damping in a machine tool derives mainly from sliding joints and bearings. Significant damping also arises from screwed and bolted joints. The reason that damping arises from joints is because dissipation of vibration energy requires irreversible strains to […]

15.9.1 Introduction Linear motor systems started to make an impact on machine tools in the late 1990s for specialist applications such as CNC crank-pin grinding and camlobe grinding [Landis 1999]. More recently, several OEMs such as Danobat (Deba, Spain), have designed machines for speed-stroke grinding with speeds up to 250 m/min and acceleration/deceleration of 5 […]

The classic electric, belt-driven dresser shown in Figure 15.43 has an ABEC 7 ball bearing arrangement for table-mounted surface grinders such as creep feed. Air-oil mist porting is required to the bearings while custom porting is provided for dressing. A proximity sensor is often placed on the pulley to confirm spindle rotation. The spindle design […]

An innovation of surface grinding driven by the Japanese in the 1980s is a process called Speed Stroke Grinding that involves very high table speeds of 50 to 100 m/min and shallow depth of cuts of the order of 1 pm or less. The interest was initially centered around improved die manufacture and achieving high […]