Like all other metals, titanium has numerous different alloys available, each with its own special set of properties and behaviour. Here is a summary of the different types:

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Titanium is known as being a tough material to work with and is very sensitive to a number of factors. Listed below are some of the key challenges with machining titanium.

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Another critical part of the system is the correct workholding. With the workpiece clamped securely, you can remove vibration from the process allowing better cutting data to be achieved. Many titanium parts are thin in section due to the nature of their use, using bespoke workholding solutions for the final operations will yield better results, often allowing greater access and support to the component.

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The main advantages of titanium as a manufacturing material are that it is highly corrosion resistant, has exceptional bio-compatibility and has the best strength-to-weight ratio of any metal. These qualities make it an especially sought-after material in the aerospace and medical industries.

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If the machine allows, increasing the feed rate means that the tool spends less time in a specific area and therefore has less time to allow heat to build up and work hardening to affect the cutting edge of the tool.

Choosing the right tool path when machining titanium is as critical as choosing the correct tool. Tool paths that ensure constant cutter engagement in the workpiece are absolutely necessary when machining titanium. When cutting out a slot, a tool path that incorporates a trochoidal pattern will reduce the amount of time that any one flute is engaged with the material, which helps limit heat build-up. Arcing the cutting tool into and out of the workpiece helps reduce shock and abrupt motion that can severely damage tools.

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This article will help demystify the challenges encountered when machining this material and provide some insight into techniques that can improve titanium machining success rates.

A robust machine tool is critical to successfully machine titanium. The ideal titanium milling machine needs to be rigid with spindles that can operate at low spindle speeds and high torque. This helps absorb vibration and reduce chatter during the cut, which is a common problem when machining titanium.

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Titanium is a widely used material in the aerospace and medical industries due to its exceptional properties. Despite its popularity, titanium is notorious for being one of the most difficult materials to machine, and tales of broken tools and ruined workpieces are abundant.

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Titanium is an insulator, and therefore the heat generated during the cutting operation tends to stay near the cutting tool. This heat blunts the tool, which in turn creates more heat, and the cycle continues until the tool fails completely. An obvious solution to excessive heat is more coolant. Blasting the work zone and tool with 10% concentrated coolant from a high-pressure supply will ensure that the contact area is kept cool and any heat-carrying chips can be washed away.

Titanium is prone to work hardening, namely, as the material is cut, it becomes harder and, therefore, even more abrasive to tooling. A constant feed ensures that cutting work-hardened material is kept to an absolute minimum.

For turning applications, the position and pressure of the coolant is crucial. With the right application, much higher surface speed and metal removal rates can be achieved. The only downside to this is potential material being redeposited onto the surface of the part. This can be overcome by planning the cutting strategy and also reducing the coolant pressure for the final finish cuts.

Titanium is certainly not a straightforward material to work with, but its material properties mean that it is here to stay. With the correct machine tool and machining strategy, titanium can be cut with ease. Contact a Kingsbury representative for expert advice on machine tools and strategies that were specifically designed for milling materials like titanium.

Carbide-tipped tools with a PVD coating are the best suited tool for cutting titanium. Newer, more advanced tool coatings are also available such as TiAIN (Titanium Aluminum Nitride). Titanium is a relatively springy material, and as such, a sharp tool is absolutely critical. Blunt tools will rub the surface and cause chatter.

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Due to titanium’s affinity to other elements, it cannot be found naturally occurring and therefore requires complex and energy-intensive processes to refine it. This means that it is very expensive compared to other common materials. Another major disadvantage of titanium is its degree of difficulty when machining processes are required.

Titanium can produce long chips that can easily damage the tooling and mark the surface of the workpiece. Furthermore, long, thin chips are not ideal as they do not assist with transferring heat away from the work zone. Tooling and tool paths that allow for the creation of smaller and thicker chips are, therefore, ideal when machining titanium.

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