Jul 31, 2019
Tantalum has a melting point of 2980℃, second only to tungsten (3380℃) among common refractory metals, and its density is 16.67 g/cm3. When annealed, tantalum has good plasticity and is relatively stable at high temperature. It can absorb and hold gas. Tantalum is acid-resistant and biocompatible. Tantalum is widely used in electronic, chemical and medical industries. At the same time, tantalum is also an indispensable material for making cemented carbide.
Tantalum has high melting point, high density, good plasticity when annealed and stable performance at high temperature. The annealed tantalum material is soft and tough, which will cause serious adhesion phenomenon when cutting and cause bond wear of the cutting tool. Especially when the cutting speed is lower than 20m/min, the phenomenon of sticking knife and tearing is more serious. When the cutting speed is higher than 40m/min, the tearing phenomenon is greatly reduced. Cutting requirements as sharp as possible, cutting speed is not too low. General use of hard alloy tool materials, commonly used YG8, YW2 and so on. Using larger rake Angle and the Angle, cutting tool geometry parameter is:γO=35o～45o，αO=5o～8o，Κr=90o,Κ′r=5o,γO1=-2o～2o,bγ=0.1～0.3mm，rε=0.2～0.5mm，in order to reduce the friction and sticking phenomenon.
The selection of cutting parameters is as follows: during roughing, νc=30～70m/min，ap=5～8mm，f=0.2～0.4mm/r；During finishing and semi-finishing, νc=50～80m/min，ap≤1.5mm，f=0.1～0.3mm/r.Cutting should use cooling and lubrication of the cutting fluid, adequate flow.
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