During the last six years there has been development in both the practice and the theory of machining and this edition is extended to refer to those changes which are significant for the immediate future. High speed steel and cemented carbide continue as the tool materials for the bulk of industrial metal cutting operations. Developments of these tools are reported in Chapters 6 and 7, and relate mostly to PVD and CVD wear resistant coatings. Progress in ceramic tools followed the successes of sialon tools which stimulated experiments in "alloying" alumina to increase toughness. This is considered in Chapter 8. Alumina-based tools containing zirconia or silicon carbide "whiskers" have found successful niches in particular operations on specific work materials where greatly increased metal removal rates have been demonstrated. It seems unlikely that ceramics will challenge cemented carbides for general machining in the near future. Ultra-hard polycrystalline diamond and cubic boron nitride have consolidated their positions and extended their range of application for cutting very hard and abrasive materials.
In chapter 9 the improvement in machinability of steel achieved by commercial introduction of special deoxidation treatment in steel making is discussed. Calcium deoxidation modifies the non-metallic inclusions, the action of which at the tool/work interface can greatly increase tool life and reduce machining costs without damage to material properties. Advances in understanding of the metal cutting process are dealt with in Chapter 5 in relation to the generation of heat and temperature distribution at the tool work interface. In chapter 9 the results of investigations carried out by Dr M.L.H.Wise and co-workers at Birmingham University into the behaviour of a range of copper alloys in machining are discussed. These offer a contribution to understanding of the influence of alloying of the work material on the machinability of metallic materials.
- ISBN10 0080511457
- ISBN13 9780080511450
- Publish Date 14 May 2014 (first published December 1983)
- Publish Status Active
- Publish Country US
- Imprint Butterworth-Heinemann
- Edition 4th ed.
- Format eBook
- Pages 465
- Language English