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International Journal of Forming Processes
1292-7775
Publication suspended
 

 ARTICLE VOL 4/1-2 - 2001  - pp.111-123  - doi:10.3166/ijfp.4.111-123
TITLE
Variable Tool-Chip Interfacial Friction in 2-D and 3-D Machining Operations

ABSTRACT
This paper presents the results from experimental studies on the role of tool-chip interfacial friction in 2-D and 3-D machining with flat-faced and grooved tools. A majority of past models have made a simplistic assumption of average or mean friction at the tool-chip interface. The cyclic nature of the chip formation process causes variations in tool-chip interfacial friction for both 2-D and 3-D machining. In turning, the nose radius imposes a non-linearity in the cutting process along the developed length of cut leading to variable toolchip interfacial friction and formation of side-curl dominated chips. This variable friction has been quantified by mapping the variations in the thickness of the plastic zone and the grain elongation across the chip width in 3-D machining. It has been found that the variable toolchip interfacial friction along with cutting parameters and tool geometry (especially the chipgroove parameters in machining with a grooved tool) influence the degree of side-curl or upcurl imparted to the chip. This curling pattern of the chip significantly dictates the predominant direction in which the chip material is deformed. The results presented in this paper throw new light on the variability of tool-chip interfacial friction prevalent in the machining process.


AUTEUR(S)
A.K. BALAJI, I.S. JAWAHIR

Reçu le 19 juin 2000.    Accepté le 12 mars 2001.

KEYWORDS
Tool-chip interfacial friction, Plastic zone thickness, Grain elongation, Cyclic.

LANGUE DE L'ARTICLE
Anglais

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