Rexroth's energy-efficient fluid technology for machine tools
With the introduction of the innovative KST booster, generation of high-pressure needed to supply cooling lubricant to internally cooled tools now takes place in the hydraulic unit, increasing energy efficiency by nearly 90%. The Rexroth Rapidstar Supply Unit (RSU) for cooling lubricants reduces piping requirements and simplifies the mechanical design. The new Rexroth suction belt filter provides filtration without filtration aids, increasing machine availability and efficiency during machining operations. It also simplifies the design of the cooling lubricant supply system.
The Rexroth suction belt filter is suitable for configurations with lift station or open discharge on grinders and large machining centers. By eliminating leakage and overflow, the design does away with the need for a sludge collection tank underneath the filter unit, reducing the footprint. The process fluid flows through an endless belt in the filter chamber. The contaminants are deposited in the filter cake on the filter belt. The filter cake acts as a filter medium and retains even the smallest particles.
A suction pump increases the static fluid pressure on the filter, increasing filter performance. Running in fully automatic mode, the filter even removes very fine chips and provides a continuous supply of decontaminated cooling lubricant to the machine tools. There is no longer any need to remove sludge from a tank underneath the filter unit, greatly extending the maintenance intervals on the filter system. This design significantly increases machine availability. The new addition to Rexroth's filter portfolio creates additional opportunities to reduce machine tool operating costs.
Rexroth has also introduced a trapezoidal trough filter which delivers nearly twice the filtration performance compared to flat or deep-bed filters. The filter is ideally suited for decentralized cooling lubricant conditioning systems in machining applications. The filter provides the optimal ratio of filtration surface to dust height in a very compact package. A scraper chain ensures dependable discharge of contaminants. Quick filter replacement and a design featuring standard components and easy access to all moving parts simplify day-to-day operation.
The new Rexroth Rapidstar Supply Unit (RSU) for cooling lubricants fully exploits the advantages of a modular low and high pressure supply system. The RSU supply system includes a range of low and high pressure valve blocks, filters and screw pumps, enabling engineers to design tailored pressure supply solutions in distributed systems. The new concept based on standardized assemblies reduces the engineering effort and significantly shortens assembly times.
With the innovative Rexroth KST booster, energy consumption can be reduced by nearly 90% on the cooling lubrication supply for internally cooled tools. The existing hydraulic unit in the machine augmented by an additional linear pump delivers pressure up to 200 bar. The booster can be activated and deactivated to meet process needs. This solution eliminates an entire motor-pump set. In addition, there is no longer any need for a fine cooling lubricant filter in most applications.