Polistar
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More brilliant grinding with Polistar. The new POLISTAR product line guarantees high-quality surfaces for grooved tools. The finest abrasive grit sizes and a fast-cutting hybrid bond coupled with the 75 years of Diametal AG expertise makes this possible. The inquiries are steadily growing in number. Moreover, the demands of the industry processing non-ferrous and light metals as well as plasties are clear: the sur- faces of grooved tools that are precision ground before and afterwards have to satisfy the highest of require- ments. The challenge here is: how can it be effectively achieved that the milling or boring tools are produced in such a way that the spiral groove manifests a surface quality of Ra <0.05, i.e. practically high-gloss polished? As is well known, ultra-precision grinding wheels are generally only capable of mastering measurements of from around 20 to 50 microns. This is where Diametal comes in with POLISTAR. With the new product line, the narrow tolerance stipula- tions of a series production run can be observed. This is made possible thanks to a successful combination of ultrafine abrasive grit sizes, embedded in an extremely fast-cutting hybrid bond. In this way, spiral grooves can be brought to shine - and with a depth of cut of 0.2 to 0.5 mm. Nevertheless, feed rates in the region of 150 mm/min are still thoroughly feasible. The increase The POLISTAR products line is not only convincing in of the grinding allowance from a few hundredths of a terms of its cutting rate but also has an astonishing millimetre to up to 5 tenths of a millimetre consider- profile stability. That allows a long deployment of the ably extends the manufacturing dimensions in rough POLISTAR disk without it having to be re-profiled. The grinding. As a result, the operating time of the roughing POLISTAR product line has been primarily conceived wheel is also increased. The higher infeed depths also for use with oil cooling, but the solution with emulsion reduce the danger of rough grinding traces remaining cooling has also proved its worth, as many tests have when polishing. shown. DIAMETAL AG/SA

Product info & operationg parameters Available: Polistar Polistar f Polistar ff If, contrary to all expectations, the surface quality is not adequate after groove polishing with the Polistar, 2 finer variants (f and ff) are available. Operating parameters (Basic Settings Polistar) Vs = 30 m/s ae = 0.15 – 0.5 mm Vt = ith ae 0.15 = Vt 200 mm/min w with ae 0.30 = Vt 100 mm/min with ae 0.50 = Vt 60 mm/min The Vt values must be reduced by 25 % in the case of Polistar f and by around 50% in the case of Polistar ff. For sharpening, use the SST No. 3. www.diametal.com DIAMETAL AG/SA...