Effects of Edge Preparation and Feed when Hard Turning a Hot Work Die Steel with Polycrystalline Cubic Boron Nitride Tools

CIRP Annals ◽  
2006 ◽  
Vol 55 (1) ◽  
pp. 89-92 ◽  
Author(s):  
L. Chen ◽  
T.I. El-Wardany ◽  
M. Nasr ◽  
M.A. Elbestawi
Keyword(s):  
Boron Nitride ◽  
Hard Turning ◽  
Cubic Boron Nitride ◽  
Die Steel ◽  
Polycrystalline Cubic Boron Nitride ◽  
Hot Work Die ◽  
Edge Preparation

Hard Turning of AISI D2 Steel by Polycrystalline Cubic Boron Nitride (PCBN)

2015 ◽  
Vol 766-767 ◽  
pp. 649-654
Author(s):  
A. Srithar ◽  
K. Palanikumar ◽  
B. Durgaprasad
Keyword(s):  
Boron Nitride ◽  
Hard Turning ◽  
Cubic Boron Nitride ◽  
Machining Process ◽  
Depth Of Cut ◽  
Machining Parameters ◽  
Aisi D2 Steel ◽  
Polycrystalline Cubic Boron Nitride ◽  
Aisi D2 ◽  
D2 Steel

The machining of hard turning is performed on hardened steel in the range of 45 to 68 Rockwell hardness using a variety of tool materials such as Polycrystalline cubic boron nitride (PCBN) , Polycrystalline diamond (PCD) and Cubic boron nitride (CBN). It is an alternative to conventional grinding process is a flexible and effective machining process for hardened metals and hence broadly used in various applications such as dies, moulds, tools, gears, cams, shafts, axles, bearings and forgings. Although the process is performed within small depth of cut and feed rates, estimates to reduce machining time as high as 60 % in hard turning. This paper discusses the importance of hard turning of AISI D2 steel. In this study, Experimental investigations are carried out on conventional lathe using prefixed the cutting conditions. The responses studied in the investigation are cutting forces (Fa, Ft and Fz). The cutting parameters considered for the investigation are cutting speed, feed and depth of cut. The influence of machining parameters on response is studied and presented in detail.

Modeling the Progression of Flank Wear on Uncoated and Ceramic-Coated Polycrystalline Cubic Boron Nitride Tools in Hard Turning

2004 ◽  
Vol 128 (1) ◽  
pp. 104-109 ◽  
Author(s):  
Ty G. Dawson ◽  
Thomas R. Kurfess
Keyword(s):  
Boron Nitride ◽  
Hard Turning ◽  
Flank Wear ◽  
Cubic Boron Nitride ◽  
Cutting Speed ◽  
Cutting Conditions ◽  
Crater Wear ◽  
Experimental Calibration ◽  
Polycrystalline Cubic Boron Nitride ◽  
Wear Modes

Accurate wear modeling has always been desired, but has also been difficult and elusive. Most useful wear models have relied on experimental calibration because the physical wear mechanisms are not fully understood. This is particularly true in machining, where contact stresses and temperatures can be extremely high. In machining, the two wear modes most frequently discussed are crater wear and flank wear. Flank wear receives much more attention because it is easier to measure and the mechanism of material loss is thought to be better understood for most machining situations. This work focuses on flank wear for the same reasons. In hard turning, tool life is relatively short and both crater wear and flank wear influence the cutting process substantially. Understanding the progression of flank wear at various cutting conditions is beneficial in itself, but the ability to predict this progression will be extremely valuable. This work addresses both. Experimental flank wear progression is shown for uncoated and ceramic-coated polycrystalline cubic boron nitride (PCBN) tools at a range of cutting conditions. These data are used to calibrate a proposed mechanical wear model that predicts the progression of flank wear and tool failure points based on the cutting speed, feed, and cutting depth. The model was validated by additional experiments, which show good agreement with the predictions.

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