Engineering partners for slewing bearings

All corporate processes at Liebherr are focussed on quality, from the selection of raw materials and suppliers to the after-sales service. Each individual component of the large diameter slewing bearing is subject to strict quality requirements. This is why we only work with select suppliers, who are audited on a regular basis. Internal company standards apply to certain raw materials like rolled steel rings. These standards contain requirements, which go beyond the common industry standards.

Sophisticated quality management

Liebherr bearings are characterised by their high quality and reliability. In order to guarantee and further improve our quality standard over the long term, we document all manufacturing and assembly processes in a production data acquisition system. This also serves as a central quality management system for production and assembly measurements, thus allowing comprehensive control, monitoring and tracking; deviations are quickly eliminated and processes are constantly optimised.

Approved quality: certifications

The numerous certifications are testament to Liebherr's high standard of quality. Aside from the usual ISO standards of the quality management system, Liebherr has the following certifications:

• DIN EN ISO 9001:2015 (PDF, 263 KB)
  This norm forms the basis for our QA system and the ongoing improvement process within the company Liebherr-Components Biberach GmbH for the business unit slewing bearings.
• EN 1090-2:2008+A1:2011; EXC3 in accordance with EN 1090-2 (PDF, 457 KB)
  This certification qualifies us to weld and produce steel support structures. These serve, for example, as earthquake protection in nuclear power stations.

Ultramodern measurement methods

Liebherr not only makes regular use of traditional computer-aided measurement methods. The Liebherr Group also possesses numerous highly specialised measuring devices. In recent years, for example, the company has invested in a state-of-the-art crack detection system using high frequency magnetisation and a fully climate-controlled large diameter bearing measuring chamber. 3D measurements of slewing rings with a diameter up to 6,000 mm can be effected. This type of measurement is unique worldwide.

The certification and classification by internationally recognised certification and inspection authorities serves as an external quality certification for Liebherr. Classifications and certifications of components and complete systems are common in the area of maritime applications and in the wind industry. The Group looks back here on the many years of successful collaboration with classification companies.

Classification companies

We work with the following certification and inspection authorities, among others:

Bureau Veritas

Lloyd's Register of Shipping

Det Norske Veritas - Germanischer Lloyd (DNV GL)

American Petroleum Institute (API)

American Bureau of Shipping (ABS)

Certificates in accordance with EN 10204

The European standard EN 10204 defines various types of inspection documents and test certificates. Depending on the requirement of the test and documentation scope, we may provide various certificates in accordance with EN 10204 for the raw parts. Certificates in accordance with EN 10204 include:

For typical applications in mechanical and plant engineering:

• Certificate of Compliance 2.1
• Factory Certificate 2.2
• Acceptance Certificate 3.1

For special requirements:

• Acceptance Certificate 3.2

The classification companies require certain certificates within the framework of a prescribed classification approval. Upon request, Liebherr issues and supplies the necessary documents.