Top in titanium
Mikrodiver impresses with milling in the medical sector
Expertise and flexibility – both are essential when there are problems to solve. And both are characteristics that make Gühring a strong partner for the medical technology sector. And this was also clear in the case of hg medical: Where conventional tools quickly reach their limits when it comes to wear, a Gühring micro-precision milling cutter with adapted carbide roughs and slots for 1100 minutes in titanium.
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More InformationAnd yet, however practical grade 5 titanium is in practice, it is also extremely challenging to machine. Due to the high toughness of the material, chips do not break, but instead tend to stick to the tool. In addition, titanium has extremely poor thermal conductivity: The temperatures up to 1200°C that occur within the cutting zone are also conducive to tool wear.
Expertise within the medical sector
Longer tool lives thanks to effective cooling
With the RF 100 Micro Diver, Gühring offers a high-performance tool for machining challenging materials in the micro range. One of the most impressive features of the micro-precision milling cutter is its innovative internal cooling: The shank contains IC channels arranged in a pitch circle around the cutting wedge. During milling, they supply the flow of coolant into the cutting zone. Cooling as effective as this is indispensable, especially for grade 5 titanium, as it is needed to reduce the high temperatures during milling and thus extend the tool life.
Another key criterion for tools used to machine titanium is reliable chip removal. As Christian Sieker, Gühring product manager for micro tools, points out, the RF 100 Micro Diver also scores points here: “The optimised tool surfaces ensure that chips do not stick in the flute, but are removed safely.” To achieve this, the tools are also provided with an extra-smooth layer. “In addition to protecting against abrasive wear, this also has the advantage that the friction between the chips and the tool is significantly lower, which also reduces the thermal load on the cutting edges,” says Sieker.
Gühring optimises carbide on a bespoke basis
Although the RF 100 Micro Diver performed significantly better than tools used in the past, it was unable to fully demonstrate its strengths at hg medical at first. The reason? The component in question is a small, very thin plate that cannot be optimally clamped. As the milling cutter travels along it, the plate begins to vibrate, causing small impacts that the very hard carbide cannot absorb. The milling cutter breaks.
But in this case, Gühring has a clear advantage over many other tool manufacturers, as Laqua explains: “We produce the carbide for our tools ourselves and can therefore adapt the individual components perfectly to suit the customer’s requirements.” As such, the experts at Gühring designed a carbide substrate that gives the tool a high level of toughness and heat resistance even when exposed to high dynamic cutting forces. A Gühring coating tailored perfectly to these circumstances ensures good sliding properties and additional wear protection.
Hardly any wear after double the tool life
Florian Lukats from hg medical is impressed: “Titanium is known to be a material that is hard to machine, but thanks to the excellent cooperation with Gühring, we were able to stabilise the milling process.” For him, this is further proof of the good working relationship with Gühring: “As our tool supplier, Gühring has been involved in the growth of hg medical from the outset, as we have an advantage over competitors thanks to such stable milling processes.”
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