Abstract
Titanium-based alloys are highly recognised for the outstanding strength, lightweight, stable properties and exceptional resistance to corrosion which make them greatly suitable material for industry applications involving harsh environmental conditions such as elevated temperature. However, in product manufacture, machining of these alloys tends to produce poor surface quality with accelerated tool wear and low material removal rate, resulting from large cutting forces, excessive workpiece temperatures and chemical reactivity owing to high yield stress and low thermal conductivity. In overcoming these manufacturing challenges, industry practice supported by current research identifies the significantly useful potential for thermally assisted machining (TAM) techniques for improving machinability of titanium-based alloys whereby localised workpiece heating is applied to temporarily reduce metal hardness at the cutting point for lessening cutting forces. Reviewing current literature, this paper appraises various manufacturing issues related to the machining of these alloys and the potential improvement to machinability characteristics of these alloys from the application of TAM techniques. A detailed evaluation is presented on the alloy machinability influenced by workpiece heating prior to or during machining process using external heat source. This investigation recognises that the laser-assisted machining (LAM) reduces cutting forces by 30–60% and tool wear by 90%. It observes that the plasma-assisted machining (PAM) reduces cutting force by 20–40%, increases material removal rate by 200% and enhances the tool life by 150 times. Additionally, the induction-assisted machining (IAM) is noted to reduce cutting force by 36–54% while increasing the tool life and material removal rate by 206 and 214%, respectively.
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Glossary
- Machinability
-
The term machinability refers to how easily materials can be removed to reshape the workpiece during machining, permitting the removal of the material with a satisfactory finish at low cost. A material is said to have good machinability if tool life is long, machining forces are low, and the surface roughness is low. The high chemical reactivity of the material with many tool materials and the low elastic modulus contribute to its difficult machinability.
- Thermally assisted machining (TAM)
-
Thermally assisted machining is a high speed machining method for materials with low machinability, such as titanium- and nickel-based alloys. In TAM, the surface of the workpiece just ahead of the machining point is preheating locally by a suitable heating source. This reduces the strength of the material and cutting force in the milling and turning process substantially which increase the machinability of the difficult-to-machine materials.
- Built-up edge (BUE)
-
A built-up edge (BUE) is an addition of workpiece material against the rake face that grasps to the tool tip, separating it from the chip. It is not tool wear though it decreases the efficiency of the cutting edge. BUE changes the geometry of the cutting tool which induces dimensional inaccuracy and poor surface finish on the part.
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Shams, O.A., Pramanik, A., Chandratilleke, T.T., Nadim, N. (2018). Comparative Assessment and Merit Appraisal of Thermally Assisted Machining Techniques for Improving Machinability of Titanium Alloys. In: Davim, J. (eds) Introduction to Mechanical Engineering. Materials Forming, Machining and Tribology. Springer, Cham. https://doi.org/10.1007/978-3-319-78488-5_10
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DOI: https://doi.org/10.1007/978-3-319-78488-5_10
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Publisher Name: Springer, Cham
Print ISBN: 978-3-319-78487-8
Online ISBN: 978-3-319-78488-5
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