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Publications (12)
In the quest for decreasing fuel consumption and resulting gas emissions in the aeronautic sector, lightweight materials such as Carbon Fiber Reinforced Polymers (CFRPs) and Ti-6Al-4V alloys are being used. These materials, with excellent weight-to-strength ratios, are widely used for structural applications in aircraft manufacturing. To date, seve...
Robotic drilling is receiving increasing attention in aerospace industry, where Ti6Al4V is used for multilayer composite/metal stacks. Being a difficult-to-machine material, dry drilling of Ti6Al4V results in excessive tool heating and premature tool wear. Through-tool flood lubrication in robotic drilling is difficult due to open and large working...
An investigation is made into the effects of liquid carbon dioxide (LCO2) cooling, minimum-quantity lubrication (MQL) and cutting speed in drilling. Experimental measurements of torque, thrust force and temperature are made over a wide range of process and operating conditions. The resulting empirical models are used to quantify the individual cont...
Single-channel supply of pre-mixed liquid carbon dioxide (LCO2) and minimum quantity lubrication (MQL) represents a state-of-the-art LCO2 assisted machining. However, to fully understand and optimize cooling and lubrication provided by the LCO2 + MQL, a fundamental media flow analysis is essential, yet not researched enough. Therefore, in this pape...
An investigation is made into the lubrication capabilities of solid-lubricated liquid carbon dioxide (LCO2) in comparison to flood lubrication, straight LCO2 and oil-lubricated LCO2 (MQL). The coefficient of friction is determined via tribological experiments, similar to machining, using an open tribometer which features an uncoated carbide insert...
One of the trends in machining is to reduce the consumption of conventional cutting fluids via the use of alternative cooling-lubrication techniques such as Minimum Quantity Lubrication (MQL) or even move to dry cutting. High friction during machining leads to heat generation, which adversely affects the tool life, workpiece surface quality and ene...
Sustainable machining of difficult-to-cut materials requires effective cooling and lubrication techniques. To substitute conventional flood cooling and lubrication, different techniques such as cryogenic cooling and/or minimum quantity lubrication (MQL) can be used. Liquid carbon dioxide (LCO2) can be pre-mixed with different lubricants before its...
Efficient cooling and lubrication techniques are required to obtain sustainable machining of difficult-to-cut materials, which are the pillars of aerospace, automotive, medical and nuclear industries. Cryogenic machining with the assistance of lubricated Liquid Carbon Dioxide (LCO2) is a novel approach for sustainable manufacturing without the use...
A novel single-channel supply of pre-mixed (a) liquid carbon dioxide (LCO2) and (b) oil – delivered via minimum quantity lubrication (MQL) – represents a significant advancement in cryogenic-machining technology. In this proof-of-concept study, an attempt is made to advance the understanding of the oil solubility in LCO2 and to analyze the oil-drop...
Fundamental knowledge of frictional phenomena in cutting processes is elemental for their further development. Both pin-on-disc and open tribometer are able to replicate the sliding velocities and contact pressures during cutting to some extent; however, open tribometer can simulate continuous sliding against freshly regenerated surface. In this pa...
Modern trends in machining include sustainable manufacturing with the focus on reducing the consumption of conventional cutting fluids. These alternative cooling-lubrication principles include Minimum Quantity Lubrication (MQL), cryogenic machining and dry machining. In the absence of abundant quantities of cutting fluid, adequate lubrication is ne...