Material testing of copper by extrusion-cutting

F. Segalina, Leonardo De Chiffre

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Abstract

An investigation was carried out on the use of extrusion-cutting as a material test method operating at severe conditions of strain, strain-rate and temperature, such as in machining. In extrusion-cutting, a shoe constrains the chip back surface producing a geometrically defined orthogonal cutting process which can be modelled using methods from the theory of plasticity such as, e.g., slip-line and upper-bound. The process was previously proposed for use as a material testing technique to determine the shear flow stress of materials under strains, strain rates and temperatures relevant for analytical modelling of metal cutting. This work represents a new step where the final objective is the generation of stress-strain curves that can be used in analytical models as well as using Finite Element Method (FEM) simulations. A new experimental setup for extrusion-cutting using discs as workpieces was developed and implemented on a CNC lathe. An investigation was carried out extrusion-cutting copper discs using high-speed-steel cutting tools at 100 m/min cutting speed. Flow stress values for copper under machining-relevant conditions were obtained from measurement of the extrusion-cutting force on the tool and application of a simple upper-bound model for the extrusion-cutting process. An attempt to extend the validity of test data to cover a range of cutting conditions was made, and suggestions for improvement of the simple theoretical model given. (C) 2017 Published by Elsevier B.V.
Original languageEnglish
JournalProcedia CIRP
Volume58
Pages (from-to)375-380
ISSN2212-8271
DOIs
Publication statusPublished - 2017
Event16th CIRP Conference on Modelling of Machining Operations - Cluny, France
Duration: 15 Jun 201716 Jun 2017

Conference

Conference16th CIRP Conference on Modelling of Machining Operations
Country/TerritoryFrance
CityCluny
Period15/06/201716/06/2017

Bibliographical note

© 2017 T© 2017 Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license

Keywords

  • Metal cutting
  • Experimental investigation
  • Pure copper
  • Material testing
  • Extrusion-cutting

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