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PTRR-40 CNC high-speed CNC roller ring lathe

Our Profimach PTRR-40 CNC high-speed CNC roller ring lathe is a special machine tools which is an ideal processing equipment used for turning tungsten carbide, high-speed steel roller ring. High processing efficiency, good consistency.

Profimach PTRR-40-CNC high-speed CNC roll ring lathe is a high-precision lathe for machining tungsten carbide roll ring and high speed steel roll ring. Its high efficiency makes it a ideal equipment for precision finishing of roll ring and disk shape parts.

Tungsten carbide roll CNC lathe - Tungsten carbide ring CNC lathe

Hardturning in Tungsten carbide


TURNING of Tungsten Carbide ROLLS

Hard-turning of WC materials certainly requires CNC turning lathes with heavy-duty characteristics, which can be listed in high-quality cast iron bed-plates with solid and integrated guideways, directly cut and heat-treated on the same bed-plate; wide beds and guideways sections to adequately distribute the load over a large area; multiple guideways system to prevent excessive tailstock quill overhang; large and no-cantilever quill, with built-in large-section bearings.

This we offer you with our newest Tungsten Roll lathe. 

TURNING vs GRINDING of Tungsten Carbide (WC) Composite Rolls

Composite WC bar/rebar mill rolls


What kind of process gives the best results, turning or grinding? Nowadays and with our profimach PTHT CNC machines the answer is in the middle of the two worlds. Both CNC heavy-duty muli-guideways lathes and CNC tungsten carbide grinders are perfectly capable of machining WC cylinders. Surely, it’s important to take into account the total amount of composite cylinders to be maintained during the year and, not least, the set of groove geometries to open, which could make the difference between contour and plunge grinding choice.

Surely, if we compare turning with the plunge-grinding process we’ll get quite similar times, while in turning vs contour grinding comparison, the global cutting time for the grinding will be much higher than for the turning. This again highlights the importance of a wider evaluation which will consider different factors, not only the single machining process.


-         SURFACE FINISH. In the hot rolling process, the finishing requirements could be different according to the different stand/application for which the composite rolls will be applied. In this regards, a CNC grinding machine can be pushed to reach better finish quality than a CNC lathe but with an increase of the overall process time, whereas, on the other side, both lathe and grinding machine can attain similar finishing result with similar times, letting the choice of the 2 machines be driven more by the production (roll maintenance) mix, than by the sole finish requirement.

-         METAL-REMOVAL EFFICIENCY. Turning of WC has rather fixed cutting parameters which must be compared with the two different grinding processes, contour and plunge grinding. Contour recreates the final groove geometry using the same grinding wheel for many different groove designs. Since the multiple grinding passes required and lower feed-rate, contour grinding requires usually higher times than turning but allows to cut different and wide geometries by means of the same standard grinding wheel. When it’s possible to make use of plunge grinding, then the turning is no longer competitive.

-         INTERRUPTED CUT. Interruptions in any machining operation place additional constraints on any process, think about the cylinders just back from the mill with the remaining ribs and hard-shell to be removed! Hard turning can deal with interruptions, but there is invariably a price to pay in terms of tool life, due to a combination of thermal shocks applied to the cutting tool. In addition, the single-cutting action (instead of the thousands cutting edges in grinding) in interrupted cuts generates a more specific excitation amplitude into the system than grinding does. Consequently, the turning lathe must be very rigid and with largely integrated guideways.