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Grinding at 100,000 rpm

Deutsche Fassung dieses Beitrags

A couple of days ago on our Schleifblog we wrote about high-speed grinding, so now we thought we’d add a bit more information about development and construction in this exciting technical field. In the world of grinding, there’s a small but not insi­gni­ficant technical dilemma: “increasing the rotation speed means reducing the rigidity of the grinding spindle – and vice versa.” But what does that actually mean?

Large grinding wheels, large spindle bearings
It’s simple: if the geometry and accessibility of the workpiece allows us to, then we use the largest possible grinding wheels on our Multigrind® grinding machines. This ensures that the abrasive particles don’t heat up as quickly, i.e. grind for longer without becoming blunt. Our high-precision, directly driven Haas spindles can rotate more slowly, but require higher torque to produce high grinding pressure. That means you need large, stable bearings – and due to their physical properties they can’t rotate very quickly, otherwise they heat up too much.

Schleifen eines Abwälzfräsers mit großer Scheibe. Foto: Haas.

Grinding a hob cutter on a CB with a large grind wheel. Photo: Haas.

Small grinding wheels, light spindle bearings
But it’s a whole different ball game for applications that require small notches or slots on one cutting edge. For this you need a small tool, that is, a small grinding wheel. And to make sure this small grinding wheel reaches a high peripheral speed, it needs plenty of revs – and of course lightweight spindle bearings.

 

Schleifen eines VHM-Fräsers auf einer Multigrind® CA mit kleiner Schleifscheibe. Foto: Haas.

Grinding a solid carbide milling cutter on a CA with a small grinding wheel. Photo: Haas.

Hans-Dieter „Charlie“ Braun. Leiter Entwicklung bei Haas. Foto: Haas

Two spindles, one grinding machine
At Haas, we’ve solved this dilemma (see above) by offering the option of two spindles in one machine. For example, a HSK 80 with 30 kW (8,000 rpm) for wheels with a diameter of 300 mm and a HSK 25 (70,000 to 120,000 rpm) for small wheels.

To give our customers even greater flexibility, we plan to launch a powerful all-round spindle (mid-range spindle, as we say in the Black Forest 😉 ) in the near future. It will take the form of a HSK 50 single spindle solution (up to 35,000 rpm) for very small grinding wheels, through to grinding wheels with a diameter of 250 mm.

If you want to talk shop with me about grinding spindles and couldn’t make it to the AMB in Stuttgart, feel free to write me an email or visit our premises in Trossingen.

Schleifen Sie gut! (as we say at Haas)

Charlie Braun

 

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