Хонинговальные головки

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 […]

The geometric function Gg(s) as illustrated in Figure 19.45 represents an inner feedback loop in Figure 19.43. The two feedback terms form circles when varying frequency. The larger circle in Figure 19.46(a) is the control wheel feedback and the smaller circle is the workrest feedback. If the two terms are added, the feedback locus is […]

Ultrasonic-assisted grinding with an oscillating wheel is divided into different process modifications. In the case of ultrasonic-assisted cross-peripheral grinding, the feed movement takes place vertically to the tool spindle axis and thus to the generated oscillation. With this process, grooves, gaps, and radii can be machined in brittle-hard materials. The feed movement in the case […]

The vibration behavior in cylindrical, internal, and surface grinding processes differ in significant ways [Inasaki 1977a]. In the case of internal and surface grinding, the chatter frequency is, in most cases, related to the natural frequency of the grinding wheel spindle system because the Amplitude ratio ycr/y   FIGURE 8.4 Geometrical interference.   dynamic stiffness […]

10.1 INTRODUCTION Coolant is a term generally used to describe grinding fluids used for cooling and lubrication in grinding. The main purpose of a grinding fluid is to minimize mechanical, thermal, and chemical impact between the active partners of the abrasion process. The lubricating effect of a grinding fluid reduces friction between the abrasive grains […]