Quality assurance of rack and pinions for electric steering with Metrology from Mahr Electric steering systems are the future of passenger cars. They consume much less energy, are made of a lighter and simpler construction. Automotive suppliers of steering systems check the quality of their racks and pinions for electric steering systems etc. with metrology from the application specialist Mahr. The users assure and improve the quality of the workpieces, reducing costly rejects. A revolution is currently taking place with the steering systems of passenger cars. Electric steering systems are taking over more and more vehicles and crowd out traditional, hydraulically operated power steering. The central element of the new steering systems is the rack. Technically, the production of these workpieces is very demanding, for example in terms of diameter and length or precise gearing. With the shaft measuring station MarShaft MAN, Mahr offers a measurement system that is ideally designed for quality assurance of the racks. For this application, Mahr offers measuring technology, software and solutions for the testing of the surface and form. The measuring station is characterized by a high-precision Z-axis with an accuracy of 3 µm + L/100. A unique feature among all manual shaft measuring devices is its accuracy of 0.8 microns + L/100 for the diameter. The measuring system is nevertheless designed for use directly in the harsh production environment in three-shift operation. The rack is clamped in the manual measuring machine in only a few simple steps and aligned perpendicular to the Z-axis. Typical results of the entire length have a repeatability of less than 5 microns over 600 mm. In diameter measurements e.g. the groove diameter has a repeatability of less than 2 microns. Even difficult measuring tasks can be solved with the measuring machine: the reference of a cross-bore to the middle of a reference tooth gap can be determined quickly and easily. The aim of quality assurance of the racks is to guarantee the quality of the manufacturing operations with the help of Mahr measuring machines, and minimize costly rejects. | 
back to overview
close
