When machining hardened steel (⩾45 HRC) with polycrystalline cubic boron nitride (PCBN) tooling, the cutting speeds used produce high temperatures in the primary shear zone, which are sufficient to plasticize the workpiece. The paper initially reviews the effect of workpiece hardness and cutting speed on chip formation, workpiece surface integrity and cutting forces. Equations are detailed for determining the primary shear zone temperature, the proportion of heat conducted into the workpiece and the shear flow stress. Following on from this, experimental work is presented involving the orthogonal machining of AISI H13 hot work die steel with PCBN tooling. Tests were carried out over a range of cutting speeds with workpieces of different hardness, in order to provide cutting force, shear angle, chip morphology and primary shear zone thickness data. The shear flow stress decreased with increasing cutting speed and/or workpiece hardness. With the AISI H13 heat treated to 49±1 HRC, the stress magnitude changed more significantly with cutting speed and the proportion of heat conducted away from the workpiece approached 99 percent at 200 m/min. Shear localized chips were produced with white unetched layers due to intense heat generation followed by rapid cooling.
Skip Nav Destination
Article navigation
August 2002
Technical Papers
The Effect of Workpiece Hardness and Cutting Speed on the Machinability of AISI H13 Hot Work Die Steel When Using PCBN Tooling
Eu-Gene Ng,
Eu-Gene Ng
University of Birmingham, School of Manufacturing and Mechanical Engineering, Edgbaston, Birmingham, B15 2TT, UK
Search for other works by this author on:
David K. Aspinwall
David K. Aspinwall
University of Birmingham, School of Manufacturing and Mechanical Engineering, IRC in Materials for High Performance Applications, Edgbaston, Birmingham, B15 2TT, UK
Search for other works by this author on:
Eu-Gene Ng
University of Birmingham, School of Manufacturing and Mechanical Engineering, Edgbaston, Birmingham, B15 2TT, UK
David K. Aspinwall
University of Birmingham, School of Manufacturing and Mechanical Engineering, IRC in Materials for High Performance Applications, Edgbaston, Birmingham, B15 2TT, UK
Contributed by the Manufacturing Engineering Division for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received March 1999; Revised Aug. 2001. Associate Editor: M. Elbestawi.
J. Manuf. Sci. Eng. Aug 2002, 124(3): 588-594 (7 pages)
Published Online: July 11, 2002
Article history
Received:
March 1, 1999
Revised:
August 1, 2001
Online:
July 11, 2002
Citation
Ng, E., and Aspinwall, D. K. (July 11, 2002). "The Effect of Workpiece Hardness and Cutting Speed on the Machinability of AISI H13 Hot Work Die Steel When Using PCBN Tooling ." ASME. J. Manuf. Sci. Eng. August 2002; 124(3): 588–594. https://doi.org/10.1115/1.1452749
Download citation file:
Get Email Alerts
Related Articles
Mechanics of Machining With Chamfered Tools
J. Manuf. Sci. Eng (November,2000)
The Mechanisms of Chip Formation in Machining Hardened Steels
J. Manuf. Sci. Eng (August,2002)
Predictive Models for Flank Wear on Coated Inserts
J. Tribol (January,2000)
Related Proceedings Papers
Related Chapters
GA Based Multi Objective Optimization of the Predicted Models of Cutting Temperature, Chip Reduction Co-Efficient and Surface Roughness in Turning AISI 4320 Steel by Uncoated Carbide Insert under HPC Condition
Proceedings of the 2010 International Conference on Mechanical, Industrial, and Manufacturing Technologies (MIMT 2010)
Cutting and Machining
Fabrication of Metallic Pressure Vessels
Modeling of Cutting Force in Vibration-Assisted Machining
Vibration Assisted Machining: Theory, Modelling and Applications