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CFRP/Titanium Stacks for Aeronautic Applications
Authors: Dr P. Müller-Hummel
MAPAL Dr. Kress KG
Time: November 3, 2009 3:00 pm
Room: Lumen
This article characterises the special features of milling and drilling of CFRP and develops aspects for new tool
geometries for milling CFRP/titanium. Simplified theoretic models will show how CFRP should be machined and
what has to be observed with regard to new developments. Low axial forces are main characteristics of the
drilling tool optimised in this way, which makes it especially suited for being used in drilling feed units.
SESSION A1B METALLIC STRUCTURES
Chair: Prof. B. Surowska (Lublin University of Technology),
Dr L. J. Ruiz-Aparicio (ATI Allegheny Ludlum)
Title: Development of ATI 425® Titanium Alloy Sheet, Strip and Foil
Authors: Dr L. J. Ruiz-Aparicio, A. DeNoi, J. V. Mantione, R. Wendel, J. Smith, Dr T. D. Bayha
ATI Allegheny Ludlum
Time: November 3, 2009 1:20 pm
Room: Candela
ATI 425® alloy titanium, with its high strength, cold formability and lower-temperature super-plastic formability,
has emerged as an innovative, high-potential alternative to 6-4 titanium, today’s workhorse alloy.
ATI is pursuing a corporate-wide technical project to add sheet, strip and foil, in individual lengths, to the
company’s current ingot, billet, plate and bar product offerings. In addition, sheet and strip in continuous coils
are being developed.
These continuous product forms have never been available in alloy titanium mill products. Continuous coils
will provide titanium sheet and strip consumers a productive, cost- saving alternative to current products. Coil
products are similar to what has been available in aluminum and steels.
With its good corrosion resistance, ATI 425® titanium possesses a unique combination of properties that allows
it to be considered for a wide variety of applications where design challenges include weight reduction or an
alternative to steel, aluminum, composites or other titanium and titanium alloys. Market sectors for ATI 425®
titanium range from aerospace, defense and commercial vehicles to recreational equipment.
This paper will provide an update of process development as well as review the production capabilities that
are expected to provide tighter-gauge tolerances and flatness for ATI 425® titanium alloy over today’s titanium
alloy sheet and strip.
Title: The most important aspects of sheet-titanium forming
Authors: Dr J. Adamus, Dr P. Lacki
Czestochowa University of Technology
Time: November 3, 2009 1:40 pm
Room: Candela
In the paper sheet-metal forming process as the essential part of modern industry, which allows for production
of the near net-shape drawn-parts, will be discussed. Although deep-drawing steel sheets still play the leading
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role in sheet metal forming the other materials like aluminium, magnesium and titanium alloys are shaped more
and more often. The main aim of the application of the light alloys is a decrease in construction weight. Titanium
and its alloys seem to be the noteworthy materials because of unique set of properties such as: low specific
gravity, high strength and good corrosion resistance. Unfortunately, using these materials entails a necessity of
solving new technological problems.
Generally, titanium alloys are rather difficult to process. Poor drawability of most titanium alloys arising from
their tendency to strain hardening at lower temperatures can be improved by working at higher temperatures.
Additionally, forming at elevated temperatures decreases spring-back and improves dimensional accuracy of
the drawn-parts. Unfortunately, such processing must be carried out under special conditions in order to avoid
diffusion of oxygen, nitrogen, and hydrogen into the titanium what affects its brittleness.
Galling and pick-up of titanium on the die pose another problem in sheet-metal forming processes. The galling
tendency of titanium is greater than that of typical deep drawing sheets. This necessitates close attention to lubrication
in each forming operation where titanium is in moving contact with metal dies or other forming equipment.
The „build-ups” phenomenon can be limited or even completely eliminated by the application of proper
technological lubricants and antiadhesive coatings on the tools. In the paper some possibilities of limitation the
unfavourable tribological properties of titanium in sheet-metal forming process will be given.
Moreover some test results for CP2 and Ti6Al4V titanium alloy will be given. The numerical simulation results of
the stamping process of the titanium cylindrical cup will be presented. A special attention will be paid to the effect
　
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