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Reducing the energy output of machine tools

05 August 2019

A test installation at a CNC lathe has demonstrated that Rittal Blue e+ chillers significantly reduce energy consumption while also being simple and easy to use.

No business should ever underestimate the large amount of energy consumed by machine tools. Cooling enclosures and spindles alone commonly account for more than 15 percent of a company’s annual energy bill. 

A test installation at a CNC lathe has demonstrated that Rittal Blue e+ chillers significantly reduce energy consumption while also being simple and easy to use. 

Bosch Rexroth AG runs an energy efficiency consultancy called GoGreen at its headquarters in the Bavarian town of Lohr am Main. 

GoGreen’s purpose is to examine and improve the energy efficiency of the company’s production plants worldwide. To this end, GoGreen works closely with institutes, as well as technology partners such as Rittal, to test possible solutions. 

One of the most important research projects which GoGreen is involved in is the “Eta-Fab” (energy efficiency, technology and application centre) project at the Technical University of Darmstadt. 

The project is headed by the University’s Institute for Production Management, Technology and Machine Tools (PTW); a facility that can closely replicate conditions and processes used in the Rexroth plant in Elchingen, allowing effective and accurate testing of potential innovations in areas such as improving the energy efficiency of machine tools.

Retrofitting CNC lathes

Among the products made at the Elchingen plant are hydraulic pumps and motors for mobile machines. Many of the components for the hydraulic power units are manufactured on a CNC lathe which has a total connected load of 75kVA and runs for up to six days a week in three-shift operation.

CNC lathes need their spindles to be cooled to dissipate the heat generated by the drive technology – and this is typically achieved through liquid cooling. 

The GoGreen team examined what would be the impact of replacing the existing compressor cooling unit on the lathe, with a new Rittal Blue e+ Chiller. The Blue e+ delivers the cooling medium and its DC compressor, controlled by an inverter, generates the necessary cooling output in the chiller. A circuit then transports the cooling medium to the spindles. 

An impressive increase in energy efficiency

The test demonstrated that the Blue e+ could reduce energy consumption significantly. Leo Pototzky, GoGreen Project Manager, Bosch Rexroth, said of the trial: “The Rittal Blue e+ chiller consumes 50 percent less electrical energy than the old chiller, while the saving achieved by the cooling unit in the enclosure even exceeded 80 percent. This example shows us that a great potential still exists in many sectors.”

Ease of use

The trial also highlighted how easy the Blue e+ is to operate. The control panel with its touch display communicates to operators in plain text, and in up to 21 different languages. This means that operators receive clear information and updates in status, which allows them to respond quickly to any issues. 

The Blue e+ App communicates with the cooling units via NFC (Near Field Communication, an international transmission standard based on RFID technology for contactless data exchange), allowing important information to be transmitted wirelessly; a functionality which is especially important when a number of chillers have been configured. It allows operators easy operational oversight and facilitates a swift response, if required.


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