White layers and extensive material drag introduced during rough machining are regarded as detrimental to surface integrity. As such a sensible method for determining the amount of be removed in roughing process would understand relationship interaction between (i.e. drilling) finishing plunge milling) operations. Within this work non-standard cutting parameters were employed generate white layer up depth 20 μm. Various milling strategies followed, with radius removal ranging from 25 μm 250...

Due to their low thermal conductivity, high abrasion of cutting edges and a tendency crack during machining, titanium aluminide (TiAl) alloys are notoriously difficult-to-cut materials when using conventional (e.g. turning, grinding, drilling, milling) operations. Despite machinability TiAl find niche application areas in the manufacture complex shaped components for aerospace gas turbine engines. Abrasive waterjet (AWJ) machining is one most promising non-conventional processes because...

In order to evaluate the surface quality of ablated Ti-6Al-4 V and Ni-Ti with a widely used 10-picosecond laser system wavelength 1064 NM at repetition rate 5 kHz, three stages have been accomplished: i) study material removal mechanism on single cracters; ii) investigation process parameters finishing linear tracks; iii) evaluation (sub-) laser-ablated pockets. Through studying influence fluencies cracters, evolution component involved in ablation has obtained. This is further supported by...

The effect of workpiece tilt angle (0°, 30°) and tool ultrasonic vibration was evaluated when machining hardened steel with electroplated CBN grinding points (B15, B30, B54). Workpiece inclination had the greatest influence in decreasing surface roughness (Ra) by up to ∼44%, lowest value (∼0.32 µm) achieved at 30° assisted using B30 wheels. Despite also reducing roughness, use actuation generally increased specific volumetric grit loss (∼11%) normal forces (∼14%) compared conventional...

Abrasive waterjet machining has been recently considered as a promising, emerging non-conventional technology with an extensive growth in its market share and research activities. In this paper, Europe’s first 5-axis AWJ system established at the University of Nottingham will be introduced followed by some works explored on capability (e.g. cutting, drilling, milling, turning) exotic materials such Ti-based alloys different niche applications. Thanks to advances complementary ultra-high...

Although a great variety of cutting dynamometer designs are available, the research laboratories/industrial users still find them difficult to employ in real production environments; this is mainly owing difficulty changing tools/cutting edges an automated manner. To address this, new design concept for innovative dynamometers operations (for example, turning), which can allow flexible/automated tool change without any disturbance industrial setups, i.e. tooling magazine, presented article....

The influence of materials swelling across the steps on surface roughness under up-cutting and down-cutting direction in ultra-precision raster milling was investigated. normalized extent is characterized by a significance index, defined based power spectral density profile. Materials found to be significant milling, especially when copper alloys machined direction. findings present study provide an important means for improving finish raster-milled surfaces optimizing cutting conditions.

Analyzing the thermal effects (e.g., heat affected zone and debris analysis) on a laser-ablated crater using electron or atomic force microscopy is time-consuming process while optical limited to providing 2D information. The current work details an alternative method identify quantify based analysis of 3D shape craters. Starting from diffusion model, iso-thermal function was developed iso-energetic defined energy beam distribution. A systematic study craters ablated silicon carried out at...

Laser ablation is a method of removing relatively small volumes material from substrate and this technique finding wide range exploitation avenues in industry; such as large scale paint remover to composite resin removal. It has particular relevance the aerospace industry due precision speed In order for be effective, laser parameters need optimised. instance, volume removed been studied using an Nd:YAG Q-Switched pulsed laser. The parameters: laser, intensity, pulse duration, frequency etc...

The formation of tool marks in single-point diamond turning is a fundamental study the effect materials swelling and recovery on surface roughness machined surface. A series orthogonal face cutting tests has been conducted among plate aluminum alloy, oxygen-free high conductivity copper electroless nickel phosphorus under same conditions by use facet tools with different front clearance angles. results show that regular width undulating pattern could be explained side micro-waviness within...