Ссылки на научные работы

[mmaag 49]

Здесь буду периодически публиковать ссылки на некоторые интересные (мне) научные работы в области металлобработки. 

В основном, заграничные (преимущественно, немецкие). Только в открытом доступе.

 

Для начала:

 

Technologie der kryogenen Kühlschmierung beim Fräsen von TiAl6V4 = Technology of cryogenic cooling and lubrication in milling of Ti6Al4V

Cryogenic cooling and lubrication often improve machining processes technologically, economically and ecologically. Compared to conventional cooling and lubrication, it is often possible to achieve an increased productivity, reduced tool wear, cooling and lubrication related cost savings, improved component quality and a reduced environmental impact and risk to employees because of cutting fluid contact. Despite this potential, cryogenic cooling and lubrication have only rarely been used industrially to date. Unresolved technological, scientific and economic issues have been identified as a main reason for this. The objective of this work was to develop scientific findings on the cause-effect relationships of cryogenic cooling and lubrication when milling the titanium alloy Ti6Al4V and to evaluate the technology economically and ecologically in comparison to conventional cooling and lubrication strategies. The starting point was the modification of a machining center for the internal supply of cooling and lubrication media through the spindle and the tool. With small tool diameters, e.g. D ≤ 12 mm, it is not always possible to provide the required number of channels for the cooling and lubrication media, as the tools can break due to the load in the machining process and the reduced cross-sectional area. One approach is therefore to mix the cryogenic medium with the lubrication medium. With this single-channel cryogenic cooling and lubrication, it was possible to quadruple the tool life compared to conventional flood cooling. Furthermore, cause-effect relationships were analyzed. Interactions between carbon dioxide and MQL oils were investigated. The focus was on the supply of the media and the solubility of MQL oils in carbon dioxide. To investigate the influence of different cooling and lubrication strategies on the thermomechanical load collective, tool holders with integrated sensors for temperature measurement in the cutting insert were developed and used. Measurements of the cutting force were also carried out. An empirical rule-based application model was derived from the findings, which was used to simplify, summarize, evaluate and explain the cause-effect relationships between the parameters, disturbance variables and the target variables. The work was concluded with an economic and ecological evaluation.

https://publications.rwth-aachen.de/record/1026874/files/1026874.pdf

 

Edited April 2 by mmaag

[maxx2000 1,142]

июль 2025 года? К  использованию углекислоты, вместо обдувки зоны реза подготовленным воздухом при обработке титановых сплавов,  с коллегами по несчастью пришли к выводу ещё лет 5-7 назад. Как раз когда столкнулись TiAl6. В принципе никто, даже сейчас не открыл ничего нового. Основное зло, известное с давних пор, ради которого следует охлаждать зону реза это азот содержащийся в атмосфере, который при нагреве азотирует налипший на фрезу титан и получается очень твёрдая хреновина. ИМХО статья интересная для тех кто не в курсе химии происходящей при обработке титана. Как всегда взяли решение лежащее на поверхности и оформили в научный труд. Надеюсь это просто студент

Цитата

Целью данной работы было получение научных данных о причинно-следственных связях криогенного охлаждения и смазки при фрезеровании титанового сплава Ti6Al4V и оценка экономической и экологической эффективности этой технологии в сравнении с традиционными стратегиями охлаждения и смазки.

Странное желание дуть в атмосферу CO2 на фоне борьбы с коровьим пуком

Edited April 2 by maxx2000

[mmaag 49]

Influence of Cutting Edge Preparation on Tool Wear of Cemented Carbide Drills on AISI P20 Steel

Drill life constitutes a critical parameter within the machining process, given its importance when dealing with the demand for high productivity and reduced process times. With regard to the cutting tool microgeometry, the condition significantly impacts the performance and its reliability. Therefore, the aim of this study was to verify the influence that cutting edge preparation has on the wear behavior and tool life of cemented carbide drills when machining AISI P20 steel. To this purpose, experimental tests were carried out on drills that maintained the microgeometry resulting from the manufacturing process, and on drills that were prepared by the brushing-polishing process. The tools were characterized using a stereoscope, scanning electron microscopy and a 3D optical measurement. Experimental results show that cutting edge preparation was effective in increasing the radius by 120% of the original value. The brushing-polishing process was capable of removing the previous defects and generated a homogeneous microtopography, verified by the average reduction of 30% in the surface roughness. This directly impacted the wear behavior, since the tool exhibited less wear during the process. In addition, wear mechanisms were also adequately controlled. For these reasons, the brushing-polishing process increased the life of the drill by 50% while maintaining the same flank wear.

https://doi.org/10.1007/s12541-025-01440-1

 

P.S.: Очень радуюсь за бразильцев. Научились красивые бумаги сочинять, не хуже, чем некоторые.