Measuring system for grinding machines
Save operating costs with MotorView from BMR
With MotorView, BMR has introduced a measuring system for grinding machines that records the power and load of the motors autonomously and completely independently of the inverter or spindle type and shows them graphically on an external display.
The system has proven itself in practice at Schaeffler Aerospace. In the grinding machines in production in Schweinfurt, raceways are ground into bearing rings using a profile tool. Due to the high precision required, the CBN grinding tool has to be dressed relatively frequently in the profile.
Fast fault detection and optimum measurement results
The system was used in practice in two steps. The first step was to detect a long-lasting malfunction in the grinding machine. The driving inverter regularly reduced the spindle voltage during the dressing process without issuing an error message. As a result, the dressing result was unsatisfactory and the bearings of the dressing spindle were stressed beyond their load limit. As a result, the spindle had to be regularly and expensively overhauled.
"We are pleased that we were able to find an explanation for this malfunction so quickly," said Bernd Römmelt, project manager at Schaeffler Aerospace. "Our aim was to reduce the costs caused by unnecessarily high material removal in the long term, and the use of Motorview makes this possible." All tests under real production conditions also led to above-average results when monitoring the dressing process. For example, a grinding roll was shaped to a diameter of 2 µm, which requires highly accurate analysis and control of the surface.
Cost savings in many areas
"All systems in our DressView family, which we started five years ago, can also be used to equip older sanding machines with standard spindles," explains BMR development engineer Dipl.-Ing. Frank Buchholz. "Expensive spindles with so-called 'acoustic emission' sensors are not necessary."
By increasing the service life of the grinding wheel, reducing machine downtimes and preventing tool damage, the investment in MotorView quickly pays for itself. Accordingly, those responsible at Schaeffler Aerospace have decided to install the system permanently.
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