Microstructure and Mechanical Properties of High Density PCBN Aggregates

2008 ◽  
Vol 368-372 ◽  
pp. 1788-1790
Author(s):  
X.J. Ren ◽  
Ming Zhi Wang
Keyword(s):  
Boron Nitride ◽  
Cubic Boron Nitride ◽  
High Density ◽  
Skeletal Structure ◽  
Hard Machining ◽  
Adhesion Properties ◽  
Polycrystalline Cubic Boron Nitride ◽  
Wear Modes ◽  
Applied Stresses ◽  
Hot Hardness

Polycrystalline cubic boron nitride (PCBN) is formed by sintering cubic boron nitride particles (cBN) at high temperature and high pressure. In this process, a network of cBN particles is formed by intergrowth and bridging between the particle phases. The response of the aggregate to applied stresses in process such as hard machining, will therefore principally involve the deformation of this skeletal structure. In this work, the microstructure and hot hardness and adhesion properties of three high-density PCBN aggregates were comparatively studied. The results were correlated to their cutting performance and wear modes in machining a carbide-based hardfacing material.

The performance of polycrystalline cubic boron nitride tools in continuous, semi-interrupted, and interrupted hard machining

2009 ◽  
Vol 223 (8) ◽  
pp. 947-953 ◽  
Author(s):  
T Halpin ◽  
G Byrne ◽  
J Barry ◽  
E Ahearne
Keyword(s):  
Boron Nitride ◽  
Tool Wear ◽  
Large Scale ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Wear Behaviour ◽  
Hard Machining ◽  
Polycrystalline Cubic Boron Nitride ◽  
And Performance ◽  
Hot Hardness

Polycrystalline cubic boron nitride (PCBN) cutting tools have enabled large-scale industrial hard machining owing to their high hot hardness and wear resistance. Experience clearly shows that tool requirements vary depending on the presence and severity of interrupts in the workpiece. The interrelationships between workpiece interruption parameters and tool wear and performance are assessed using a programme of continuous, semi-interrupted, and interrupted hard machining tests. A hypothesis for observed variations in wear behaviour between different PCBN grades and test conditions is developed on the basis of detailed tool wear scar analyses.

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.

scholarly journals Technics Research on Polycrystalline Cubic Boron Nitride Cutting Tools Dry Turning Ti-6AL-4V Alloy Based on Orthogonal Experimental Design

2018 ◽  
Vol 142 ◽  
pp. 03002
Author(s):  
Yunhai Jia ◽  
Lixin Zhu
Keyword(s):  
Surface Roughness ◽  
Experimental Design ◽  
Boron Nitride ◽  
Feed Rate ◽  
Flank Wear ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Orthogonal Experimental Design ◽  
Polycrystalline Cubic Boron Nitride

Ti-6Al-4V components are the most widely used titanium alloy products not only in the aerospace industry, but also for bio-medical applications. The machine-ability of titanium alloys is impaired by their high temperature chemical reactivity, low thermal conductivity and low modulus of elasticity. Polycrystalline cubic boron nitride represents a substitute tool material for turning titanium alloys due to its high hardness, wear resistance, thermal stability and hot red hardness. For determination of suitable cutting parameters in dry turning Ti-6AL-4V alloy by Polycrystalline cubic boron nitride cutting tools, the samples, 300mm in length and 100mm in diameter, were dry machined in a lathe. The turning suitable parameters, such as cutting speed, feed rate and cut depth were determined according to workpieces surface roughness and tools flank wear based on orthogonal experimental design. The experiment showed that the cutting speed in the range of 160~180 m/min, the feed rate is 0.15 mm/rev and the depth of cut is 0.20mm, ideal workpiece surface roughness and little cutting tools flank wear can be obtained.

Sintering of binderless cubic boron nitride and its modification by β-Si3N4 additive for hard machining applications

2020 ◽  
Vol 86 ◽  
pp. 105100 ◽  
Author(s):  
V. Bushlya ◽  
I. Petrusha ◽  
O. Gutnichenko ◽  
O. Osipov ◽  
R. M'Saoubi ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Cubic Boron Nitride ◽  
Hard Machining
Sign in / Sign up

Export Citation Format

Share Document