An overview of the machinability of aeroengine alloys

Surface integrity in material removal processes: Recent advances

Machining of Composite Materials

A review of mechanical drilling for composite laminates

https://escholarship.org/content/qt7hd8r1ft/qt7hd8r1ft.pdf

Advancing Cutting Technology

Drilling of Multi-Layer Composite Materials consisting of Carbon Fiber Reinforced Plastics (CFRP), Titanium and Aluminum Alloys

Coolant lubricants are recognized as undesirable factors in metal cutting, especially in machining advanced and difficult-to-cut materials. For both economic and ecological reasons, as well as because of increasing legislation, efforts are being made to reduce the use of coolants. On account of this, the introduction of dry machining and minimum quantity lubrication (MQL) techniques in machining processes is increasing. The results of the investigations carried out give an overview of the possibilities for influencing the machining of advanced materials, e.g. titanium alloys and extreme low-sulphur steels. The research topics focus on cutting tool performance and wear mechanisms at high cutting speeds while using different lubricants and cooling supply strategies. The investigations and verification experiments contribute to increasing process stability and tool life, improvement of machined surface finish and avoidance of tensile residual stresses.

Aspects of cooling lubrication reduction in machining advanced materials

Turbine blades requiring regular and certified repair and maintenance cycles. An advanced maintenance system for turbine blades based on a multi-axis high-speed milling center with reverse engineering devices enables adaptive reshaping of blades with individual geometries due to the functional requirements. In order to perform the repair procedure as automatically as possible, an adaptive milling technique was applied. The principle of the adaptive milling for the repair purpose is to generate a milling path for a turbine blade geometry and modify it for a damaged blade according to the geometrical information provided by the 3D sensors. The RTD work performed to reach these goals are are outlined. The authors discuss the simulation and verification of multi-axis milling processes, 3D shape measurement, and the milling reference model.

Advanced mechatronic technology for turbine blades maintenance

Many countries worldwide are increasingly engaging in the promotion of biomass production for industrial uses such as biofuels and bioproducts. Biomass raw materials and biofuels offer the opportunity to replace petrochemical resources for a large variety of bioproducts (chemicals, bioplastics, etc.) and fossil fuels. Until today, mainly biofuels were supported by European policies, but support for bioproducts is still lacking behind. Thus, also the public sustainability debate concentrated on biofuels, but so far not on bioproducts. Driven by the strong public debate on sustainability aspects, biofuels are confronted with many environmental and socio-economic impacts. For instance, social impacts, which can be both positive and negative, include property rights, labour conditions, social welfare, economic wealth, poverty reduction, etc. In order to address these sustainability aspects of biomass production for industrial uses, different national and international efforts towards certification systems have been evolving, including the European Renewable Energy Directive (RED). However, besides many efforts on environmental aspects, there is a general lack of socio-economic considerations. This gap is addressed by the EU-FP7 Global-Bio-Pact project in a comprehensive approach involving partners from Europe, Latin America, Africa, and Asia. The main aim of the Global-Bio-Pact project is the improvement and harmonisation of global sustainability certification systems for biomass production, conversion systems and trade in order to prevent negative socioeconomic impacts. Thereby, emphasis is placed on a detailed assessment of the socio-economic impacts of raw material production and a variety of biomass conversion chains. This paper presents an overview of the Global-BioPact project as well as an introduction to socio-economic sustainability issues of biofuels and bioproducts worldwide.

R. Janssen

Papers

Drilling of Multi-Layer Composite Materials consisting of Carbon Fiber Reinforced Plastics (CFRP), Titanium and Aluminum Alloys

Aspects of cooling lubrication reduction in machining advanced materials

Advanced mechatronic technology for turbine blades maintenance

Global Socio-Economic Impact Assessment of Biofuel and Bioproduct Chains

Advanced Mechatronic System for Manufacturing and Repair of Turbine Blades