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The detection of cutting tool wear during a machining process is one of the most important considerations in automated manufacturing systems. This study presents a new approach for classification and detection of tool wear in milling process using multi-sensor signals and Mahalanobis-Taguchi system (MTS). The MTS is one of the decision making and pattern recognition systems frequently used to solve...
Cerchar Abrasivity Index (CAI) has been commonly used to represent rock abrasion for estimation of tool wear in rock excavation applications. This test is a simple and effective measure of rock abrasion but operating parameters can impact its results. This paper focuses on the influence of water saturation on CAI values based on laboratory testing of 33 sedimentary rock units collected from different...
Zr-based bulk metallic glasses (BMGs), especially Zr41Ti14Cu12.5Ni10Be22.5, are widely used as mechanical components due to their simple preparation process and excellent properties. In this study, the tribological properties of Zr41Ti14Cu12.5Ni10Be22.5 pins and different counterpart materials (AISI 5120 steel, AISI 52100 steel and Zr41Ti14Cu12.5Ni10Be22.5 amorphous discs) were investigated using...
This paper reports on the optimization of (Ti,Si , Al)N x coatings to improve the performance of coated tools in dry cutting applications. The performance and the wear mechanisms of (Ti,Si , Al)N x tungsten carbide coated tools were investigated. Tool life and tool failure modes were thoroughly examined by scanning electron microscopy (SEM) complemented with energy...
Cutting tool wear is known to affect tool life, surface quality and production time. Because of this an online tool wear measurement and monitoring system has been developed, using a low-cost sensor. The system is able to detect and analyze signals relating to the deflection of the tool holder from the cutting force, and the corresponding estimation of wear is displayed on the computer screen. New...
The wear of materials in sliding contacts is considered as resulting from an energy dissipation due to friction between the contacting first bodies. Up to now, no standard procedure in tribology is available to relate that dissipated energy with wear losses for different sliding wear tests and conditions. In this paper, a procedure is proposed to correlate the volumetric wear loss of one first body...
Physical vapour deposited multilayered (Ti,Al)N/TiN coatings of different sublayer thicknesses were investigated and compared with monolayered (Ti,Al)N and TiN coatings. Mechanical characterisation was done using a depth sensing nanoindenter. Hardness and elastic modulus of multilayered coatings are higher than those of monolayer (Ti,Al)N coatings and sometimes comparable to TiN coatings. The mechanical...
In a European research programme focused on the development and validation of test methods for thin hard coatings, friction and wear characteristics of TiN coatings were investigated. Ball-on-disc sliding tests were performed in ambient air of 50% RH at various applied loads under a fixed sliding speed. The coefficient of friction was measured on-line whereas the worn-off volume was determined by...
A procedure for solving the Navier-Stokes equations for the steady, one-dimensional flow of a binary water-based lubricant within an infinite breadth hydrodynamic journal bearing is described. The method uses the Newton-Raphson iterative technique to obtain the interface layer in the flooded clearance along the bearing. The implementation of the Simpson rule of integration technique into the equation...
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