Using the correct prelube oil increases tool service life

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PTU tool wear research

The Institute for Production Engineering and Forming (PTU) of the Technical University of Darmstadt has developed an analysis method that considers tool wear, as well as the associated tool life for set stress levels. This was implemented in parallel with a monitoring system to reduce the wear development analysis effort. During the test series with our proven Multidraw PL 61, we were able to perform an additional test with the new Prelube PL 61 SE. Researchers at PTU were able to show a significant improvement of Multidraw PL 61 SE over Multidraw PL 61. Specifically, the use of Multidraw PL 61 SE provides a significant reduction of tensile forces. Compared to the previous prelube oil, the tensile force under maximum stress dropped by nearly 11 percent, while decreasing by 7 percent as the stress went down by 10%.

Under high stress conditions, there was a clear difference in service life up to the time of failure: In particular, Multidraw PL 61 withstood on average 59 strokes, while Multidraw PL 61 SE withstood 147 strokes for the same stress level. This corresponds to a 2.5 times increase in productivity. Under reduced stress conditions, service life increased 2.1 times. The reference PL 61 attained 905 strokes, while the new prelube oil reached 1863 strokes. Therefore, the absolute increase in tool service life is seen as a particularly important economic factor to raise productivity in press shops. Especially when one comes close to extreme stress levels, as evidenced during testing, an optimum lubricant with better additives significantly increases the carrying capacity, which brings measurable improvements in forming complex components.

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