
2015-09-29 | 000-006-172 DE-EN
SCHAEFFLER AG, MILAN/HOMBURG
Schaeffler at EMO 2015 (Hall 03, Booth H08 L07)
Hydrostatic compact guidance system HLE 4.0 - for active control of axes
The fully hydrostatic compact guidance system HLE introduces, for the first time, a development project of second generation INA linear technology with integral pressure sensors. The 4.0 functionality allows workpiece machining to be actively controlled, increasing machining quality and efficiency. The pressure pockets of the saddle plate are filled with a sliding material in order to prevent crash situations. In the latest generation HLE-A-XL, this sliding material is replaced with a special bronze coating to ensure very high emergency running characteristics.
Pressure pocket data for active control of the machine tool
Dynamic rigidity and the reduction of vibration play a significant role in machine tools due to increasing dynamics and higher power densities. Schaeffler is offering a fully hydrostatic compact guidance system HLE-A-XL to complement the adaptive damping provided by the RUDS damping carriage in combination with the linear recirculating roller bearing and guideway assembly RUE-E. This ready-to-fit and sealed system with integrated pressure control combines the functions of guidance and damping within the design envelope of a monorail guidance system. It is thus a substitute for monorail guidance systems. Piezoresistive pressure sensors are used in the 4.0 version of the HLE-A-XL. The sensors measure the pressure changes in the pressure pockets which occur due to changes or variations in the operating forces. The pressure pocket data are used to calculate the three-dimensional machining forces at the working point (3D logging) through calculation algorithms working in the background. This allows the HLE-A-XL to provide active control for the machine tool. By taking the moving masses of the unit into consideration as well, the calculation program can also use the calculation model to determine the residual operating life of all rolling bearing elements.
The addition to the product range of the second generation hydrostatic compact guidance system HLE-A-XL in X-life quality provides machine tool manufacturers with the option of realizing different machine tool performance classes within one machine concept. The HLE-A-XL provides excellent damping characteristics combined with high dynamic rigidity. This means higher cutting rates, improved surface quality and longer tool life for end users. The 4.0 functionality will allow machining to be actively controlled in the future by means of additional integral pressure sensors, thus increasing machining quality and efficiency.
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