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Effect of cryogenic cooling and sol–gel alumina wheel on grinding performance of AISI 316 stainless steel

100%

Manimaran G. , Pradeep Kumar M.

tom Vol. 13, no. 3

304--312

The ineffectiveness of conventional coolants and their adverse impact on the environment have led to the use of cryogenic LN2 (liquid nitrogen) as an alternative coolant, which is effective in reducing the grinding zone temperature, and providing better lubrication, in addition to being a clean technology. The sol–gel (SG) alumina grinding wheel, with a self-sharpening characteristic, is used for the experiment. The grinding experiments were conducted on AISI 316 stainless steel under the three environments of dry, wet and cryogenic cooling. The Cryogenic coolant delivers a reduction of about 32% in the grinding forces, 30–49% improvement in the surface roughness, and 45–49% lesser temperature even at higher material removal rates. Cryogenic cooling produces fewer surface defects compared to dry and wet cooling. The effects of the LN2 delivery pressure on the machining zone, in terms of the grinding forces, surface roughness, and grinding zone temperature, were also studied.

Hybrid GRA-PCA and modified weighted TOPSIS coupled with Taguchi for multi-response process parameter optimization in turning AISI 1040 steel

100%

Mst. Nazma S. , Nikhil Ranjan D.

tom LXVIII, nr 1

23--49

The objective of the present study is to optimize multiple process parameters in turning for achieving minimum chip-tool interface temperature, surface roughness and specific cutting energy by using numerical models. The proposed optimization models are offline conventional methods, namely hybrid Taguchi-GRA-PCA and Taguchi integrated modified weighted TOPSIS. For evaluating the effects of input process parameters both models use ANOVA as a supplementary tool. Moreover, simple linear regression analysis has been performed for establishing mathematical relationship between input factors and responses. A total of eighteen experiments have been conducted in dry and cryogenic cooling conditions based on Taguchi L18 orthogonal array. The optimization results achieved by hybrid Taguchi-GRA-PCA and modified weighted TOPSIS manifest that turning at a cutting speed of 144 m/min and a feed rate of 0.16 mm/rev in cryogenic cooling condition optimizes the multi-responses concurrently. The prediction accuracy of the modified weighted TOPSIS method is found better than hybrid Taguchi-GRA-PCA using regression analysis.

Nowe osiągnięcia w technikach chłodzenia przy obróbce superstopów

70%

Jemielniak K.

tom R. 94, nr 7

6--16

The paper presents an update of the recent literature on advances in cooling techniques for machining of difficult to machine materials such as nickel and titanium-based alloys used in aero-engine and aerostructure applications. The review covers: cryogenic machining, minimum quantity lubrication, the combination of MQL and cryogenic cooling, and high-pressure lubricoolant supply. Examples of applications in industrial processes are also given.

W artykule przedstawiono najnowsze osiągnięcia w technikach chłodzenia przy obróbce materiałów trudnoobialnych, takich jak stopy niklu i stopy tytanu, stosowanych w silnikach i konstrukcjach lotniczych. Przegląd obejmuje: chłodzenie kriogeniczne i minimalne, połączenie tych technik, czyli kriogeniczne chłodzenie minimalne, oraz chłodzenie pod wysokim ciśnieniem. Przedstawiono również przykłady zastosowań przemysłowych.