Experimental investigation of dry and cryogenic broaching of AISI 4340 steel

ABSTRACT

An attempt has been made to investigate, dry and cryogenic broaching of AISI 4340 steel, which is predominantly used in turbine and gear manufacturing industries. The components in these industries employ broaching for mass production, and minimal deviations are the preliminary goal. A cryogenic broaching setup was developed to conduct the experiment in pull-type broaching machining cycle. In cryogenic broaching an increase of microhardness by 4.26–18.77%, curtailment in cuttingtemperature by 46.85–65.12%, and attrition in surface roughness by 87.94–96.35% is observed in correlation with dry broaching of AISI 4340 steel. TOPSIS analysis conducted for the experimental run evaluated, cutting speed of 2.1 mm/min and depth of cut 8 mm as the close to ideal solution for dry and cryogenic broaching. In cryogenic broaching the surface morphology characteristics of the broached component are superior owing to the drop in temperature, curtailed lengths of the chips and colossal lubrication factor. This in turn causes, roughness value to drop by 54.11% in cryogenic broaching in correlation with dry broaching of AISI 4340 steel. Additionally, grain size in cryogenic broaching reduces by 10.93% and 7.72% in correlation with dry broaching and base material of the sample. With the curtailment of grain size, compressive residual factor increased by 32.43%, in cryogenic broaching in correlation with dry broaching of AISI 4340 steel. The rate of corrosion drops 34.29% in cryogenic broaching in comparison with dry broaching, this is owing to the fact of refined structure along with the reduction in grain size, and increase incompressive residual factor.

KEYWORDS:

• Broaching
• chip
• corrosion
• cryogenic
• hardness
• morphology
• stress
• temperature

Correction Statement

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