Expanding the grinding envelope

Körber Schliefring will bring several brands to this year's event, including the latest grinding technology from Mägerle and Studer.

A compact design, flexibility and performance are characteristics of the Mägerle MFP-050 creep feed grinding centre. Through its high axis speed of 20m/minute and rapid tool change, the company claims it is one of the most productive machines of its type.

Processes such as grinding, milling and drilling can be carried out in a single set-up resulting in more productive machining and simple operation. An intelligent design principle brings higher manufacturing quality, safety and cost efficiency to the production. Coolant is directly supplied via a 2-axis CNC nozzle system ensuring optimum heat removal.

The grinding wheels are mounted on the spindle in a fixed position and profile change is effected via automatic positioning of the diamond rolls in the Z-axis. This leads to a much greater machining range and the virtual elimination of collision zones between spindle and workpiece. By using the full diameter of the grinding wheel, costs can be significantly reduced.

The new S41 CNC universal cylindrical grinding machine from Studer pairs higher precision with much high metal removal rates. In addition the longitudinal and cross slides, as well as the swivel axis for the wheelhead are equipped with electric direct drives which move to the working position much more quickly and precisely.

Features of the S41 include, for example, the more solid, rigid and thermally stable machine bed made of Granitan S103. The formula of this mineral casting is designed for optimal grinding operation conditions and thus the machine bed literally provides the integrated guide system with a stable basis for absorbing the high forces that occur during grinding with high metal removal rates.

The new StuderGuide guideway system ensures high precision of the longitudinal and cross slides when both stationary and during movement through use of hydrostatic and hydrodynamic guides to avoid the slip-stick effect or floating of the slide. Also contributing to the machine's high precision is the fact that the solid gray cast iron longitudinal and cross slides rest completely on the guideways over the entire travel. With this maintenance free system, Studer guarantees a straightness of <0.003mm over a measured length of 950mm.

Longitudinal and cross slides are moved by linear direct drives which at up to 20m/minute achieve four times higher travel speeds and axis system resolutions of 10nm. The swivel movement of the B-axis turret wheelhead is also direct drive. It swivels the turret wheelhead around three times faster and positions the new grinding wheels in a much shorter time with a positioning range of <1 inch.

The height of centres on the standard version has been increased to 225mm and the machine is also optionally available with a height between centres of 275mm, which has been achieved not by means of distance plates, but by making the workheads higher. The maximum distance between centres is 1,000mm on the standard machine, but a machine variant with a distance between centres of 1,600mm is also available.

Up to four external grinding wheels or three internal grinding spindles enable over 30 grinding head combinations. The grinding wheels are no longer driven by belt drives, but only by motor spindles. The machine can also be equipped with motor spindles for high speed grinding. Internal grinding spindles with speeds from 6,000rpm to 120,000rpm can be used.

Automatic balancing systems and frequency converters for each external grinding spindle allow the grinding process to be specifically matched to the respective conditions of use. Wheelhead variants are also available with a vertical spindle for grinding keyways or with a traverse grinding axis for the traverse grinding of internal tapers.

Körber Schleifring
www.schleifring.net
Hall 5 Stand 5485