Definition of hard turning
Machinability of difficult materials - Application to hardened steels
Article REF: BM7048 V1
Definition of hard turning
Machinability of difficult materials - Application to hardened steels

Author : Gérard POULACHON

Publication date: April 10, 2004 | Lire en français

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1. Definition of hard turning

Hard turning involves the turning of ferrous materials hardened to between 45 and 70 HRC, mainly by internal or external finishing and, in some cases, roughing operations using modern tools with defined geometries.

Figure 1 shows the straightening of a rolling mill roll (hardness 58 HRC, a p = 4 mm, f = 0.1 mm/ rpm, V c = 100 m/min).

These hard materials are characterized by the following properties:

  • high penetration hardness, as shown in figure

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