Study of the build-up process when turning high-speed steel by form tools

The formation of build-up edges when turning structural steel by form tools made of various types of high-speed steel is studied. The effect of the cutting speed on the build-up edge size is investigated, and the strength of its adhesion on the cutting edge, the lifetime, and the breaking-off frequency are determined. A new device was developed to get chips with an attached build-up. The results of research showed that the lowest adhesion strength is observed on the tools made of high-speed steel with high tungsten content. At the same time, the increased vanadium content in the steel increases the adhesion strength of a build-up. The maximum build-up and, consequently, the highest tool lifetime correspond to lower cutting speeds. The obtained data support the hypothesis that stable build-up edges can protect the cutting tool from excessive wear.

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