JUNE-JULY 2018 Nov-Dec 2017 - Copy - Page 17

ARTICLE Dry, residue-free machining www.ghmediabusiness.com Cooling and cleaning with the quattroClean system when machining PEEK disposal of cooling lubricants. External cooling prevents icing up and facilitates retrofitting In contrast with other solutions, cooling takes place externally with the quattroClean system rather than through the tool. The non-abrasive and non-toxic jet of snow and compressed air is easy to focus and can be directed exactly where it is needed in the defined process zone around the cutting edge, chips and tool. For this, the CO 2 nozzle “travels” with the tool. Among other applications, the quattroClean system is used in serial productions to lubricate, cool and simultaneously clean machined implants and medical components made from PEEK. Another serial application is in metal processing. Here, the system is used to cool tools when machining parts made from aluminum. In both cases, productivity could be stepped up by over thirty percent by cooling with CO 2 externally using the acp system. Compact and targeted control Thanks to its modular concept, the quattroClean system from acp can be easily adapted to customer demands and has a very small footprint. Process parameters, such as the volume flow for compressed air, or the quantity of carbon dioxide required, can be optimally adjusted to the application concerned. The duration of the jet for both process parameters can also be modified separately. This high degree of flexibility enables the system to be used for completely new applications, as well as for applications which were unsuccessful with standard systems. www.acp-micron.com 17 The fact that solid-state carbon dioxide sublimates at room temperature makes this a dry process. Consequently, chips are clean and dry as well as fully recyclable. Dry machining also means that workpieces and machines stay much cleaner. In many cases, there is no further need to clean workpieces after processing. Depending on cleaning requirements, a cleaning module can be integrated quickly and efficiently downstream of the machining process. A further advantage of cooling with CO 2 is that parts, for example for medical products, are machined free of contamination. The low temperature also minimizes the risk of a workpiece deforming. Finally, no costs are incurred either for maintenance, care or the is generated as a by-product from chemical processes as well as from the generation of energy from biomass, thus making it environmentally neutral. It is transported at room temperature to the non-wearing circular two- component nozzle. The CO 2 only transforms from a liquid to a solid state in the form of fine snow crystals as it leaves the nozzle. The crystals are then bundled by a circular jacketed jet of compressed air and advanced to the process zone at supersonic speed. The temperature of the medium at this point can be as low as 78 °C. On one hand, the patented technology with the jacketed jet ensures a constant pressure and consistently good cooling results. On the other hand, only the quantity of carbon dioxide needed for the desired cooling effect is supplied.