Хонинговальные головки

Slideways employing recirculating rolling elements were the salvation of the machining center man­ufacturers as a means of reducing manufacturing costs while increasing speed for high-precision circular interpolation with CNC controls. They also virtually eliminated stick-slip (u = 0.001 to 0.003) and accompanying loss of motion, without the need for expensive hydrostatic way designs. They were […]

Electric motors can be subdivided into three categories: traditional ac motors, ac servomotors with high — frequency drives popular since the early 1990s, and most recently dc brushless servomotors with high — frequency drives. The trend in these motors is to go to higher and higher power densities so as to be as compact as […]

High-performance deep grinding, with increased wheel peripheral speed and increased feedrate, is a special case requiring a cooling lubricant supply system adapted in terms of pressure and volume flow capability [Rowe and Jin 2001]. Application limits for high-performance grinding result from wheel safety requirements, that is, the maximum admissible peripheral speeds for grinding wheels. These […]

One of the most fundamental decisions for the process engineer is to decide which is the most suitable metal removal process. For example, EDM is a relatively slow method for cutting complex forms but Dresser Spindle   Blade station 2   Blade station 1   Demountable base plate   FIGURE 16.28 Parts ganged up in […]

In deep grinding, the long contact length allows substantial convective cooling from the grinding coolant. Also, in high-rate grinding with low specific energy, the heat taken away by the grinding chips reduces maximum temperature very substantially [Rowe and Jin 2001]. One of the advantages of high-rate grinding is that specific energy is reduced. Allowance can […]

In 1938, in the first edition of Grinding Wheels and Their Uses, Heywood wrote: “Internal grinding machines are being improved so rapidly that a machine only a few years old is practically certain to make the internal grinding operation cost more than it would with a later model.” The most striking fact about this statement […]

The control wheel is usually a rubber bond wheel. The rubber bond allows the regulating wheel to fulfill three important functions. These are to provide sufficient friction for speed control, to provide sufficient flexibility for error averaging, and to provide a surface that can be easily machined to provide accurate positioning. The rubber bond satisfies […]

Costs per part were evaluated for each grinding wheel using redress life from the trials. Cost comparisons were made based on conditions yielding best results from previous trials. Figure 19.28 shows typical redress life results. The end of the redress life is indicated when the process no longer yields roughness, roundness, or any other quality […]

19.12.6.1 Static Compliance Static compliance of the machine system is simply the inverse of static stiffness. Static compliance depends primarily on the elasticity of the wheels, bearings, slideways, and machine structure. System behavior, including the effect of static compliance, is similar to the results given by the simulations in Section 19.11. For this case H […]

To evaluate the machining process, the development of process forces was analyzed for a path — controlled feed speed. Figure 20.14 illustrates that a grinding operation without ultrasonic assistance Material removal rate of peripheral plunge grinding Grinding tool: D46…151 St50 C90 Cooling lubricant: Solution 4%, p = 5 bar Cutting velocity: vca = 3.1 m/s […]