✍ Scribed by A. Benner; P. Beiss
No coin nor oath required. For personal study only.
The automobile industry is by far the most important end user for structural PM steel parts. Structural PM parts are most frequently used in engines and transmissions. Usually, the PM components are produced by die pressing. The demand for cost reduction and constantly rising quality requirements in this field of application led to the development of new variants of die pressing in the recent past which facilitate the pressing of higher densities and, consequently, higher strengths. One of these new techniques is the warm compaction technology. Apart from improving the materials properties after sintering, this technique offers the advantage that the green compact shows a significantly higher green strength already after the pressing step so that machining can be executed before sintering.
Particularly for high‐strength PM steels, which usually show very uncomfortable machining properties in the as‐sintered condition, a clear cost advantage is attributed to green machining. Initially, it was expected that wear aspects were completely unimportant during green machining and could be neglected to a great extent. However, more detailed investigations prove that in contrast to that assumption a certain wear resistance of the tools is necessary, as well. Taking the example of drilling, this study deals with the wear mechanisms relevant for green machining and with the different wear behaviour of current tool substrates during green machining.
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