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COVID-19: How Kennametal is responding

Metallurgical Expert Knowledge on Titanium:

The low thermal conductivity of these materials does not allow the heat generated during machining to dissipate from the tool edge.The high work-hardening tendency of titanium alloys can also contribute to the high cutting forces and temperatures that may lead to depth-of-cut notching. 

300M

300M and Aermet 100 are also materials largely used for landing gears. They have strong mechanical properties (tensile strength > 1500 MPa versus titanium 1200MPa), excellent damage tolerance, and cracking resistance.

Alpha-Beta (α-ß) Alloys

These alloys feature both α and ß phase and contain both α and ß stabilizers.
The simplest and most popular alloy in this group is Ti6Al4V, which is primarily used in the aerospace industry. Alloys in this category are easily formable and exhibit high room-temperature strength and moderate high-temperature strength. The properties of these alloys can be altered through heat treatment.

Beta (ß) Alloys

Beta (ß) alloys contain transition metals, such as V, Nb, Ta, and Mo, that stabilize the ß-phase. Examples of commercial ß alloys include Ti11.5Mo6Zr4.5Sn, Ti15V3Cr3Al3Sn, and Ti5553. Beta alloys are readily heat-treatable, generally weldable, and have high strength. Excellent formability can be expected in the solution treated condition. However, ß alloys are prone to ductile-brittle transition and thus are unsuitable for cryogenic applications. Beta alloys have a good combination or properties for sheet, heavy sections, fasteners, and spring applications.

Challenges

Gear systems include nose landing gear & main landing gear.
Depending on the size of the aircraft, landing gear systems can be very large.
Due to the size of these components, long reach tooling and large tool engagement challenge the tool stability and rigidity. 

Requirements

  • Tool stiffness, tool stability
  • Long reach tooling

Tooling Solutions

Helical Shoulder Milling

 

HARVI™ Ultra 8X