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Small CBN Grinding Discs

"Alongside diamond, cubic crystalline boron nitride (CBN) is one of the hardest grinding materials available," said a Liebherr spokesperson. "CBN grinding discs are suitable for the highest quality requirements because they are dressing-free, wear-resistant and heat-resistant. Liebherr has developed very small CBN grinding discs with a diameter of just 25 mm for gears subject to collision and with low tool overrun. The company is therefore extending the geometric process limits for internal and external gears with interfering contours."

CBN grinding discs have a steel body that is electroplated with abrasive CBN grains. "The basic steel body is break-resistant and can be reused several times," said the spokesperson. "However, the manufacturing process is complex, especially when making very small discs. With more than 30 years of CBN expertise, Liebherr has the necessary expertise to manufacture the grinding discs completely in-house."

The smaller the discs, the more complicated they are to manufacture: "In this size range, the process has no margin for error," explained Haider Arroum, Head of Sales for gear cutting tools at Liebherr. "You also have to choose the right grain size to achieve the desired surface roughness of the workpiece while generating as little wear as possible, even at high rotary and cutting speeds. Liebherr's special design allows for shorter and more economical grinding processes."

The tiny discs are already being used by Liebherr-Aerospace for profile grinding of small gears for planetary gear trains. "They are very happy with the results. And as expected, both the quality and the cost-effectiveness were excellent-an important factor in this area in particular," said Arroum.

For more information contact:

Liebherr Gear Technology, Inc.

1465 Woodland Drive

Saline, MI 48176-1259


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