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Performance optimisation of the turning process along with multi-surface heating process

100%

Sathish Kumar D. , Thanigaivelan R. , Natarajan N.

Materials Science Poland

2022

tom Vol. 40, No. 4

1--13

Materials that are difficult to cut possess excellent qualities and machinability, though conventional machining techniques require additional energy to circumvent the problems associated with the turning process. In this study, heat-assisted turning of duplex stainless steel (SS) was carried out. Various heating techniques such as infrared (IR)-, ultraviolet (UV)- and hot air(HA)-assisted heating were adopted. The experiment used an L16 orthogonal array with the most significant parameters such as heating method, feed rate in millimetres per revolution (mm/rev), depth of cut (millimetres [mm]) and cutting speed (metres per minute [m/min])on the cutting force and surface roughness. The technique for order performance by similarity to ideal solution (TOPSIS) and grey relational analysis (GRA), were used to optimise the output performance. The results of TOPSIS showed that the 16th experimental combination, i.e., the HA heating method, with feed rate = 0.175 mm/rev, depth of cut = 0.1 mm and cutting speed = 150 m/min, required a smaller cutting force and resulted in lower surface roughness. In case of the GRA method, the best output performance was observed for the 15th experimental combination, that is, the HA heating method, with feed rate = 0.15 mm/rev, depth of cut = 0.2 mm and cutting speed = 200 m/min. Compared to the non-heat-assisted turning process, the HA- and UV-assisted processes required 10.25% and 7.69% lesser cutting force, respectively, and the surface roughness in case of the HA method was 15.13% lesser.

Convective drying of wood chips at high temperature

100%

Boszko M. , Malczewski J. , Grabarczyk R.

Annual Review of Agricultural Engineering

2006

tom 05

Review of the Characteristic Curves of Silkworm Cocoon Hot air Drying and its Technological Configuration

72%

Wei P. , Tuo W. , Chen J. , Chen X. , Xie J.

Fibres & Textiles in Eastern Europe

2018

tom Vol. 26, no. 4 (130)

20--28

To pass on Chinese cocoon-drying technology to developing countries, this paper reviews characteristic curves of silkworm cocoon hot air drying and its recent research advances in cocoon-drying technology in China based on the epochal and regional characters of cocoon drying technology development. (1) Three characteristic curves of cocoon drying are systematically explained, each of which can be divided into preheating, constant speed, and deceleration stages. The temperature susceptibility (i.e., the characteristics of response to temperature conditions) curve of the pupa successively shows heating, constant temperature, and heating processes. (2) Changes in the drying speed and temperature susceptibility of a fresh cocoon layer and naked pupae were examined in detail before and after pupae were killed in the preheating stage. It is proposed that heating the cocoons as soon as possible during the preheating stage of cocoon drying improves the work efficiency and cocoon quality. (3) The effects of the temperature and humidity of the hot air on the cocoon drying speed (i.e., speed coefficients) are obtained using the enthalpy psychrometric chart. The parameter configuration of cocoon drying technology is elaborated according to the speed coefficients in combination with the characteristic curves of cocoon drying and the influence of the laws of cocoon drying technology on cocoon quality. Furthermore, problems in the technological configuration and the direction of future development are noted.

Aby przekazać chińską technologię suszenia kokonów krajom rozwijającym się, w artykule przedstawiono charakterystyczne krzywe suszenia gorącym powietrzem kokonu jedwabnika oraz najnowsze osiągnięcia w dziedzinie technologii suszenia kokonów w Chinach w oparciu o epokowe i regionalne cechy technologii suszenia kokonów. Przedstawiono trzy charakterystyczne krzywe suszenia kokonów, które można podzielić na etapy podgrzewania wstępnego, stałej prędkości i spowalniania. Zbadano szczegółowo zmiany w szybkości i prędkości suszenia świeżej warstwy kokonu i nagich poczwarek przed i po zabiciu poczwarek na etapie wstępnego podgrzewania. Zaproponowano jak najszybsze podgrzewanie kokonów podczas etapu wstępnego suszenia kokonu, co wpływa na poprawę wydajność pracy i jakość kokonu. Wpływ temperatury i wilgotności gorącego powietrza na prędkość suszenia kokonu (tj. współczynniki prędkości) oceniono stosując wykres psychrometryczny entalpii. Konfigurację parametrów technologii suszenia kokonów opracowywano na podstawie analizy uzyskanych współczynników prędkości, charakterystyk krzywych suszenia kokonu i wpływu technologii suszenia na jakość kokonu.

Mode for hot air drying of alder blanks that retain the colour acquired during the steaming process

58%

Dziurenda L.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2021

tom 114