Ultra-precision CNC machine tools play a significant role in the machining of precision dies and molds, optics, consumer electronics, etc., Due to the nature of ultra-precision machining, a subtle change in process condition, machine anomalies, …
Publications
Effect of Crystallography on Residual Stresses during Ultra-Precision Machining of Sapphire
Residual stresses play an important role in determining the quality of a machined surface during ultra-precision machining (UPM) of ceramics by initiating cracks at premature loads. In this study, the anisotropy in residual stresses resulting …
Study on Cutting Force and Tool Wear in Machining of Die Materials with Textured PCD Tools Under Ultrasonic Elliptical Vibration
Machining of steel-based alloy (STAVAX) and tungsten carbide (WC) is very challenging due to their superior hardness. Severe wear in the machining of the die materials is the dominant problem. Texturing on the rake face …
Separation and Compensation of Geometric Errors of Rotary Axis in 5-Axis Ultra-Precision Machine Tool by Empirical Mode Decomposition Method
In machining of a microstructure on a free form surface, a five-axis ultra-precision machine tool has a great advantage in its flexibility and efficiency compared to a conventional machine tool. However, rotary axes in the …
Detection of Process Variation in a Cold Forging Process through Smart Manufacturing
Defective products in the manufacturing process induce a large loss annually. Employees on the manufacturing inspect the products in order to detect defectives but it is impossible to inspect every product and it costs too …
Core-Multishell-Structured Digital-Gradient Cathode Materials with Enhanced Mechanical and Electrochemical Durability
Ni‐rich cathode materials provide high energy density, but their structural and surface instability limits their cyclability and thermal stability. As one of the approaches to mitigate this problem, cathode materials comprising Ni‐rich high‐capacity core wrapped …
Application of Deep Learning for Fault Detection in Industrial Cold Forging
The feasibility of using deep learning techniques in industrial cold forging for fault detection was investigated. In this work, vibration data were collected from an industrial setting to detect machine conditions resulting in defective products …
Study of Material Removal Behavior on R-plane of Sapphire during Ultra-Precision Machining based on Modified Slip-Fracture Model
In this paper, the modified slip/fracture activation model has been used in order to understand the mechanism of ductile-brittle transition on the R-plane of sapphire during ultra-precision machining by reflecting direction of resultant force. Anisotropic …
Machinability Study of Single-Crystal Sapphire in a Ball-End Milling Process
Sapphire has received increasing attention as an engineering material even though its machinability is still an issue. In this study, the influence of the milling process parameters on the surface quality of single-crystal sapphire is …
Design and Development of PCD tool for Micro Grinding of Tungsten Carbide
Micro grinding with a poly crystalline diamond (PCD) tool is one of the promising approaches for fabricating a micro mold on difficult-to-cut materials. Modeling of micro grinding is necessary to understand the key design factors …