Small but powerful
25 millimeters – the size of a two-euro coin – is the diameter of the new CBN grinding discs developed by Liebherr-Verzahntechnik GmbH specifically for machining critical component geometries with low tool overrun. They can be coated with specifically selected grain for longer service life and faster grinding processes.
Kempten (Germany), 07/2022 – Alongside diamond, CBN (cubic crystalline boron nitride) is one of the hardest grinding materials available. 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 millimeters for gears subject to collision and with low tool overrun. The company is therefor extending the geometric process limits for internal and external gears with interfering contours.
CBN expertise at Liebherr
CBN grinding discs have a steel body, which is electro-plated with abrasive CBN grains. The basic steel body is break-resistant and can be reused several times. However, the manufacturing process is complex, especially when making very small discs. With more than 30 years of CBN expertise, Liebherr has the necessary know-how to manufacture the grinding discs completely in-house.
Optimized design
The smaller the discs, the more complicated they are to manufacture: “In this size range, the process has no margin for error,” explains Haider Arroum, Head of Sales for gear cutting tools at Liebherr. “And 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.
Successful in the aerospace industry
The tiny discs are already being successfully used by Liebherr-Aerospace for profile grinding of small gears for planetary gear trains. “They’re 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,” says Haider Arroum.
About Liebherr-Verzahntechnik GmbH
Liebherr develops and produces high-quality gear cutting machines, gear measuring machines, gear cutting tools and automation systems. The range includes gear hobbing, gear shaping, gear skiving, generating and profile grinding machines as well as chamfering and deburring machines. The measuring devices with software developed in-house stand for ergonomics, user-friendliness, precision, robustness, durability and service-friendliness. Liebherr is also one of the world‘s leading manufacturers of gear cutting tools and stock tools with long service life. The range of automation systems ranges from linear robots and robot applications to conveying and storage systems through to solutions for pallet handling systems.
About the Liebherr Group
The Liebherr Group is a family-run technology company with a highly diversified product portfolio. The company is one of the largest construction equipment manufacturers in the world. It also provides high-quality and user-oriented products and services in a wide range of other areas. The Liebherr Group includes over 140 companies across all continents. In 2021, it employed more than 49,000 staff and achieved combined revenues of over 11.6 billion euros. Liebherr was founded in Kirchdorf an der Iller in Southern Germany in 1949. Since then, the employees have been pursuing the goal of achieving continuous technological innovation, and bringing industry-leading solutions to its customers.
25 millimeters – the size of a two-euro coin – is the diameter of the new CBN grinding discs developed by Liebherr-Verzahntechnik GmbH specifically for machining critical component geometries with low tool overrun. They can be coated with specifically selected grain for longer service life and faster grinding processes.
Kempten (Germany), 07/2022 – Alongside diamond, CBN (cubic crystalline boron nitride) is one of the hardest grinding materials available. 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 millimeters for gears subject to collision and with low tool overrun. The company is therefor extending the geometric process limits for internal and external gears with interfering contours.
CBN expertise at Liebherr
CBN grinding discs have a steel body, which is electro-plated with abrasive CBN grains. The basic steel body is break-resistant and can be reused several times. However, the manufacturing process is complex, especially when making very small discs. With more than 30 years of CBN expertise, Liebherr has the necessary know-how to manufacture the grinding discs completely in-house.
Optimized design
The smaller the discs, the more complicated they are to manufacture: “In this size range, the process has no margin for error,” explains Haider Arroum, Head of Sales for gear cutting tools at Liebherr. “And 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.
Successful in the aerospace industry
The tiny discs are already being successfully used by Liebherr-Aerospace for profile grinding of small gears for planetary gear trains. “They’re 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,” says Haider Arroum.
About Liebherr-Verzahntechnik GmbH
Liebherr develops and produces high-quality gear cutting machines, gear measuring machines, gear cutting tools and automation systems. The range includes gear hobbing, gear shaping, gear skiving, generating and profile grinding machines as well as chamfering and deburring machines. The measuring devices with software developed in-house stand for ergonomics, user-friendliness, precision, robustness, durability and service-friendliness. Liebherr is also one of the world‘s leading manufacturers of gear cutting tools and stock tools with long service life. The range of automation systems ranges from linear robots and robot applications to conveying and storage systems through to solutions for pallet handling systems.
About the Liebherr Group
The Liebherr Group is a family-run technology company with a highly diversified product portfolio. The company is one of the largest construction equipment manufacturers in the world. It also provides high-quality and user-oriented products and services in a wide range of other areas. The Liebherr Group includes over 140 companies across all continents. In 2021, it employed more than 49,000 staff and achieved combined revenues of over 11.6 billion euros. Liebherr was founded in Kirchdorf an der Iller in Southern Germany in 1949. Since then, the employees have been pursuing the goal of achieving continuous technological innovation, and bringing industry-leading solutions to its customers.