Cutting high-purity titanium sheets and titanium alloys.

Cutting and general principles of titanium alloys.

Titanium alloys are divided into a-phase, b-phase and a+b-phase according to the metal organization, and are branded and typed as TA, TB and TC respectively. Generally cast forgings use TA series and bars use TC series.

Characteristics and cutting processing.

Compared with ordinary alloy steel, titanium alloy has the following advantages:

The density of titanium alloy is only 4.5g/cm3, which is much smaller than iron, and its strength is similar to that of ordinary carbon steel.

Good mechanical properties: the melting point of titanium alloy is 1660 ℃, higher than iron, high thermal strength, can work below 550 ℃, good toughness at low temperature.

On the other hand, titanium alloy has poor cutting and machining properties. The main reason is:

Poor thermal conductivity, resulting in high cutting temperatures and reduced tool durability.

At temperatures above 600°C, an oxidized hard layer is formed on the surface, which has a strong wear effect on the knife.

Low plasticity, high hardness, increased shear angle, small contact length between the chip and the front face, high stress on the front face, and easy damage to the knife edge.

Low modulus of elasticity, large elastic deformation, the workpiece surface close to the rear knife surface rebound, the machining surface and the rear knife surface contact area is large, serious wear.

These characteristics of the titanium alloy cutting process make it difficult to process, resulting in low processing efficiency and high tool consumption.