Why Titanium is the best option for aerospace and medical industry regarding machined parts?
High strength and lightweight.
Its density is only about half of steel, so titanium parts weigh roughly half as much as steel parts. But its high strength — 80,000 psi for pure titanium and 180,000 psi-plus for its alloys — is far greater than the strength of many alloy steels giving it an extremely high strength-to-weight ratio. Titanium has twice the elasticity of steel, making it an ideal choice for applications that require flexible materials that don’t crack or rupture. Also, titanium alloys resist corrosion and oxidation better than stainless steels.
Many of the same qualities that enhance titanium’s appeal for most applications also contribute to its being one of the most difficult to machine materials.
A strategy for success in cutting Ti:
• Use positive cutting geometries to minimize cutting forces, heat generation and part deflection.
• Use constant feed to prevent work hardening of the workpiece. Never stop feeding while the tool is in the cut.
• Use large volumes of coolant to preserve thermal stability and to prevent temperature build-up that can lead to subsurface irregularities and possible tool failure.
•Keep tools sharp. Dull tools accentuate heat build-up, and cause galling and seizing that lead to tool failure.
• Machine titanium alloys in the softest state possible. Because many alloys are age hardenable – they get harder when heat is applied – they become stronger and more abrasive as second- phase particles form.
• Use a large tool nose radius or round inserts whenever possible to put more of the tool into the cut. This decreases the cutting force at any one point and prevents localized damage.
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