Metallurgical Expert Knowledge on Titanium:

Titanium alloys retain strength at high temperatures and exhibit low thermal conductivity.

Inconel is a superalloy characterized by a unique combination of high temperature corrosion resistance, oxidation resistance, and creep resistance. Superalloys are well suited for use in very extreme heat and chemical environments. Super Alloys have a very poor machinability.

Alpha-Beta (α-ß) Alloys

These alloys feature both a 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 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. 

Metallurgical Expert Knowledge on Super Alloys:

Challenges

Keeping the coefficient of friction at a low level is critical to maintain long tool life.
Using proper coolant delivery it will keep temperatures at the cutting edge controlled and ultimately controls process reliability.

Under pressure and direction, the coolant knocks chips off the cutting edges and provides anti-corrosive benefits for the machine tool.

There is a high correlation between the amount of coolant delivered and the metal removal rate.

Coolant Considerations

Use synthetic or semi-synthetic at proper volume, pressure, and concentration. A 10% to 12% coolant concentration is mandatory. Through-coolant for spindle and tool can extend the tool life by four times. An inducer ring is an option for through-spindle flow. Maximize flow to the cutting edges for best results.

At least 3 gal/min (13 liter/min) is recommended, and at least 500 psi (35 bar) is recommended for through-tool-flow.

A high-pressure system reaching up to 150bars is the state-of-the-art recommendation for aerospace alloys turning.

For high volume production, a very high-pressure system reaching up to 350bars of coolant pressure at the tool is recommended.

Tooling Solutions

Ceramic End Mills

 

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