Numerical investigation of mechanical induced stress during precision end milling hardened tool steel

Andreas Reimer, Stephen Fitzpatrick, Xichun Luo, Jie Zhao

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

3 Citations (Scopus)
55 Downloads (Pure)

Abstract

Hardened tool steels are widely used materials for forming dies, due to their increased strength and hardness. However, their machinability is very poor, due to the high hardness of the material, which leads to high cutting forces and premature failure of the cutting tools. This is also associated with machining induced tensile stresses within the work piece. No full factorial design has been performed when end milling tool steel, due to the high associated costs. Instead of physical experiments, numerical models are commonly used to save cost and time. However, most of the recent research focus was only on 2D FE-Models. 2D model can be used for simulation of some simplified process, however, the results are not sufficient for accurate prediction. Therefore, a 3D FE-model of a precision end milling process with a two-flute ball nose cutter were established in this paper, in order to build a multi cutting edge model. In the FE-Model, a subroutine was implemented to model work piece hardening during the cutting process. The subroutine realised an accurate prediction of the residual stress and cutting forces. In addition, a material removal criterion was developed and implemented. The influence of cutting parameters on cutting force for end milling H13 tool steel was studied, through full factorial numerical simulations, to evaluate the effectiveness of this FEA model. Subsequently, after validation of the FEM model through machining trials, empirical models were developed for predicting cutting forces and residual stress. The cutting parameters evaluated were cutting speed, feed rate and depth of cut. In summary, it was found that the simulation and the experiments had a good agreement on the value and trend of the residual stress. The FEM model can be effectively used to predict residual stress in the machined surface.
Original languageEnglish
Title of host publicationPrecision Machining IX
Subtitle of host publicationICPM 2017
EditorsAngelos P. Markopoulos, George-Christopher Vosniakos
Place of PublicationZurich, Switzerland
Pages362-369
Number of pages8
ISBN (Electronic)9783035731996
DOIs
Publication statusPublished - 25 Sept 2017
Event9th International Congress on Precision Machining, ICPM 2017 - Athens, Greece
Duration: 6 Sept 20179 Sept 2017

Publication series

NameSolid State Phenomena
Volume261 SSP
ISSN (Print)1012-0394
ISSN (Electronic)1662-9779

Conference

Conference9th International Congress on Precision Machining, ICPM 2017
Country/TerritoryGreece
CityAthens
Period6/09/179/09/17

Keywords

  • FEM
  • milling
  • tool steel
  • residual stress
  • surface integrity

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