Performance Evaluation of Uncoated and Coated Carbide Tools During Hard Machining of AISI 4340 Steel

The present paper is a contribution to the investigation of physical phenomena accompanying sawtooth chip formation in the case of hard turning. The study concerns the machining with coated carbide of tempered AISI 4340 steel with a Rockwell C hardness of 47 HRC. The main idea in this paper deals with the establishment of a direct relationship between serrated-chip morphology simultaneously with force component signals derived from acquisition at high frequency and with the width of facets detected on a workpiece machined surface. This experimental work was supported by a numerical simulation based on Abaqus/ Explicit software. Numerical results dealing with effect of temperature evolution on the chip morphology show that the beginning of the sawtooth chip initiation is due to an adiabatic shear at the tool tip with propagation pathway towards the free surface. In addition, computed results have a good corroboration with those obtained experimentally.

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Some studies on hard turning of AISI 4340 steel using multilayer coated carbide tool

Measurement ◽

10.1016/j.measurement.2012.03.024 ◽

2012 ◽

Vol 45 (7) ◽

pp. 1872-1884 ◽

Cited By ~ 125

Author(s):

R. Suresh ◽

S. Basavarajappa ◽

G.L. Samuel

Keyword(s):

Hard Turning ◽

Carbide Tool ◽

Aisi 4340 Steel ◽

Coated Carbide Tool ◽

4340 Steel ◽

Coated Carbide ◽

Aisi 4340

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Improvement in Surface Quality With Molybdenum Disulphide as Solid Lubricant in Turning AISI 4340 Steel

Volume 3: Design and Manufacturing, Parts A and B ◽

10.1115/imece2010-37367 ◽

2010 ◽

Author(s):

A. P. S. Gaur ◽

Sanjay Agarwal

Keyword(s):

Surface Quality ◽

Solid Lubricant ◽

Machining Process ◽

Tool Geometry ◽

Molybdenum Disulphide ◽

Aisi 4340 Steel ◽

4340 Steel ◽

Coated Carbide ◽

Zone Temperature ◽

Aisi 4340

It is generally considered that the heat produced during the machining process is critical in terms of workpiece quality. Relatively high friction effects in machining cause heat generation that can lead to poor surface quality of a machined part. Coolant and lubrication therefore play decisive roles in machining. Cutting fluids are introduced in the machining zone to improve the tribological characteristics of machining processes and also to dissipate the heat generated, but they are partially effective within a narrow working range. In addition, they also create some techno-environmental problems. Solid lubricant assisted machining is a novel concept to control the machining zone temperature without polluting the environment. Solid lubricant, if employed properly, could control the machining zone temperature effectively by intensive removal of heat from the machining zone. Therefore, the aim of present study is to investigate the effect of molybdenum disulphide as solid lubricant in the zone of machining. Experiments were carried out to investigate the role of solid lubricant such as molybdenum disulphide on surface finish of the product in machining a AISI 4340 steel by coated carbide inserts of different tool geometry under different cutting conditions. Results indicate that the effectiveness of solid lubricant is substantial through the experimental domains.

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