GH4169, a nickel-base heat-resistant alloy, usually has outstanding high-temperature strength, excellent thermal stability and good wear resistance. However, it is hard to cut and its machined surface quality and integrity are particularly sensitive to a manufacturing process employed. The study reported in this paper was conducted to initially, review existing research on machining-induced sur...

High energy ball mills are used to grind powder material down to a particle size below one micron. Up to now, the detailed physical mechanisms of the grinding process inside the mill have not been fully understood. Hence, the design of these mills as well as their process parameters is based on empirical results. The ball mill has been simulated by discrete event simulation (DES) using typical ...

In this study, the correlation existing among grinding, surface integrity, and flexural strength is investigated for WC-Co cemented carbides (hardmetals). A fine-grained WC-13 wt % Co grade and three different surface conditions: (1) ground, (2) mirror-like polished (reference), and (3) ground plus high-temperature annealed, are investigated. Surface integrity and mechanical characterization is...

The antidiabetic activities of bitter melon powders produced with lyophilization/superfine grinding and hot air drying/normal grinding were investigated in vivo for selecting a suitable bitter melon processing procedure. After a five-week treatment, bitter melon lyophilized superfine grinding powder (BLSP) had a higher antidiabetic activity with reducing fasting blood glucose levels from 21.40...

Due to increasing demands on cutting tools, cutting edge preparation is of high priority because of its influence on the tool life. Current cutting edge preparation processes are mostly limited to generating simple roundings on the cutting edge. Multi-axis high precision form grinding processes offer great potential to generate defined cutting edge microgeometries. Knowledge about the relation ...

This report provides results recorded from the application of a coalescing plate separator to grinding and lathe coolant filtration. Use of the filter and normal recommended practices in monitoring coolants significantly extended coolant life, increased the tool life of carbide inserts and grinding wheels an average of 25'10, and resulted in cleaner machines and coolant sumps. The use of deioni...

2014 Previous ESR results from YBa2Cu3O7 powders are contradictory. We present results on YBa2Cu3O7 single crystals, obtained through systematic intensity measurements, a comparison of X and Q-band spectra, a comparison with the spectra from other related Y/Ba/Cu oxides, and a study of the influence of grinding the crystals. The ESR of conduction electrons was not detected. Although anisotropic...

In this work, machining test was carried out in various machining conditions using ultrasonic vibration capable CNC machine. For work material, alumina ceramic (Al2O3) was used while for tool material diamond electroplated grinding wheel was used. To evaluate ultrasonic vibration effect, grinding test was performed with and without ultrasonic vibration in same machining condition. In ultrasonic...

Modeling for the ball mill grinding process is still an imperative but difficult problem for the optimal control of mineral processing industry. Due to the integrated complexities of grinding process (strong nonlinearity, unknown mechanisms, multivariable, time varying parameters, etc.), a hybrid intelligent dynamic model is presented in this paper, which includes a phenomenological ball mill g...

in this research, the effects of temperature, time and grinding on the types of phases in the calcined kaolin and calcite mixture was investigated. differential thermal analysis (dta) and x-ray diffraction of samples showed that gehlenite is formed at 990 ˚c as the main phase which transforms into anorthite with an increase in the temperature to 1200 ˚c. after grinding the mixture and with incr...