Хонинговальные головки

12.4.1 Introduction With better understanding of new technologies such as this, it is often possible to push productivity considerably further. The example described before, based on grinder technology that is now 15 years old, had a cycle time of about 6 min limited by burn. On the latest grinders with much more sophisticated CNC controls, […]

Basically, a grinding wheel has three components: abrasive, bond, and core. Figure 14.2 presents the three components of a superabrasive diamond or CBN wheel [Inasaki 1998]. In general application, diamond wheels can be resin, metal, or vitrified bond. Wheels can be classified according to the bond material as either [Marinescu et al. 2001] monolayer-electroplated wheels […]

In addition to the shear damping base design, Slocum [1992] and Weldon [Hallum 1994] developed a self-compensating hydrostatic bearing design for use on their Model 1632 cylindrical grinder (Figure 15.16). A gear pump (1) provides vibration-free fluid delivery to the self-compensating pads (2). The fluid enters the pad through ports at the edge of each […]

Hydraulic drives generally use gerotor pump technology to provide a compact high-power/high- torque motor that has made this style of dresser drive the mainstay of form-roll dressing applications for conventional wheels for the last 30 years. Hydraulic spindles suffer from serious thermal problems as they get hot after only a few minutes, although this can […]

16.3.1 Introduction By means of creep feed grinding, or creep grinding as it is more concisely termed, considerable material-removal rates were achieved with high surface qualities for the first time in the early 1950s. In order to harness the potentials of this grinding process, machines, grinding tools, and grinding technologies were developed [Uhlmann 1994a]. DIN […]

Many aerospace components are complex but relatively weak structurally or have reference surfaces that can easily distort. Traditionally, these parts are held by encapsulating them in a low melting alloy. This provides a solid robust structure with clearly defined and rigid location surfaces. However, the mounting and dismounting processes are expensive and add no processing […]

The effect of workspeed is defined by Peclet number L. Values greater than 5 represent reasonably high workspeed, although much higher values can be achieved and allow cool grinding. Peclet number L is given by v • l p-c L = w c 4 • k where k = thermal conductivity, p = density, and […]

A fixed infeed system has major limitations from the inability to adapt to changes in incoming stock or wheel conditions. Much research has been carried out to develop systems to control the system based on force either directly using normal force or indirectly by monitoring power (tan­gential force). One of the earliest versions was the […]

“Dressing” is a term that commonly includes truing the grinding wheel to achieve a true form and dressing to achieve a suitable cutting edge distribution and sharpness. “Conditioning” is another term used for preparation of a grinding wheel particularly in the case of CBN. Conditioning as a term is used in different ways in different […]

Basic trials were conducted to produce direct-effect charts for specific energy, roughness, roundness, size, and G-ratio. Many factors were varied including wheel speed, workspeed, dwell period, dresser speed, dressing direction, dressing overlap ratio, and dressing depth. Two levels were chosen for each variable. The levels were selected based on experience to give a reasonable span […]