Хонинговальные головки

The best way to investigate the influence of any cutting or grinding process on the physical properties of the machined workpiece would be to directly measure on the generated surface. Until now only very few sensors are available to meet this demand. Two techniques are explained that have the highest potential for this purpose. The […]

The third group of alloys is cobalt based. These alloys display the best high-temperature corrosion resistance but have the lowest grindability and are the most expensive. They are, therefore, used in just the hottest part of the engine. However, one area where expense is not so important and where strength and corrosion resistance are critical […]

15.3.1 Introduction Guideways are the elements or surfaces that carry and guide the moving elements such as work­piece holder/drives and wheel and dresser heads. Guideways can be divided into two categories— sliding and rolling element. Guideways of either type are often known simply as slideways. Their selection is dependent on many factors such as speed, […]

To improve damping characteristics, part finish, and wheel roundness, a number of Japanese machine tool builders, in particular, have revisited the use of hydrodynamic spindle bearings [Shigiya 2 n. d., Okuma n. d.,Toyo n. d., Kondo 1998]. Hydrodynamic bearings were popular in older grinding machines due to their reliability, good accuracy, and long life. The […]

Figure 15.52 shows a double-barrel infeed carrier with hydraulic-mechanical compensator for plunge form dressing used on a Cincinnati 480 30° plunge centerless grinder. It replaced a hydro­static single-point dresser unit and was equipped with a DFW-HHD heavy-duty hydraulic spindle. FIGURE 15.52 Hydraulic-mechanical compensator plunge infeed system for centerless grinder. 15.18.6 Triple-Barrel Infeed Carrier with Hydraulic-Mechanical […]

Coolant must be delivered from the pump via the piping, valves, and nozzle at the required pressure to match wheel velocity and in a laminar flow. Any turbulence or entrained air will create dispersion TABLE 16.4 Metric Flowrate Chart for a Nozzle with a Coefficient of Discharge of 0.95 Flowrate (1/min) for Listed Nozzle Diameters […]

Since the mid-1980s, the Institute for Machine Tools and Factory Management of the Technical University Berlin worked on an analytical description of the relative motions in cycloidal restricted guidance on lapping machines. A model was developed that calculates the profile wear of the lapping wheel as a function of the path curves of the workpieces […]

In the basic internal grinding process, the wheel is fed perpendicularly into the part usually accompanied by a short-stroke high oscillation along the axis of the wheel. The part is rotated in the opposite direction to the wheel (down grind) in virtually all applications except occasionally in finish grinding with large interrupted cuts if roundness […]

A machining process is an interaction of geometric, kinematic and dynamic, physical, chemical, and tribological phenomena. It is not necessary to fully understand all these interactions to achieve a satisfactory process, but it is necessary to be aware of the factors that can influence the outcome and seek to determine best practice for each part […]

The main route to increasing removal involves increasing the number of abrasive grains that remove material within the grinding period. The number of active grits can be increased by: • Increased grinding wheel diameter • Increased grinding wheel width • Increased grinding wheel speed A larger number of active grits means more material can be […]