1. Process flow
According to the characteristics of titanium alloy material parts, the extrusion process of open die forging → closed extrusion → pre-forging → final forging is used to avoid excessive thick oxide layer, excessive stress and uneven structure in closed forging. Defects such as excessive burrs are produced.
2. Vacuum heat treatment
During the extrusion process, multiple vacuum heat treatments are used to improve the structural properties of the titanium alloy and prevent titanium from being immersed in the titanium alloy by elements such as O, N, H, and C in the air, forming an interstitial solid solution, which seriously distorts the surface lattice. The plasticity is reduced and interacts with N and C to form hard layers such as TiN and TiC with high hardness, which are easy to crack during the extrusion process.
3. Control the rate of extrusion deformation
It adopts the method of controlling the deformation temperature, deformation speed and deformation amount of spinning parts, supplementing heating and heat preservation during the extrusion process, and controlling difficulties such as poor plasticity and work hardening extrusion of titanium alloy material parts.
4. Selection of extrusion equipment
1) The extruder must have sufficient rigidity.
2) The press must have a large working stroke and energy.
3) The slider should have good guiding accuracy.
