Hot extrusion of titanium alloy rods is the extrusion of powder at elevated temperatures to achieve full densification of the product. Hot extrusion method can accurately control the composition of the material and the internal organization of the alloy. The hot extrusion method can be divided into two forms: jacketed hot extrusion method and non-jacketed hot extrusion method.
For active metal titanium and titanium alloy powder, in order to prevent oxidation of the product, often use the envelope hot extrusion method. At this time, the first good package, the powder or billet to be installed in the package, after pre-extraction and sealing, it will be placed in the extruder, hot extrusion.
At this time the package sleeve material used should have a good thermoplasticity, not with the release material to form a full gold, hot extrusion easy to peel, easy to source, low cost. The use of more low carbon steel or stainless steel sheet.
Titanium alloy bar hot extrusion of the first process is the combination of forming, sintering and thermal processing, so as to directly obtain the better mechanical properties of the drilling products.
The second process is to form titanium and titanium alloy powder. After sintering, the prepared sintered billets are hot extruded (for Ti-32Mo alloys at 1000-1100°C), and the properties of the titanium alloy products obtained. The effect of extrusion le ratio on the properties of titanium material. As can be seen from the table, titanium materials with a theoretical density of 98.6%-99.1% can be obtained.
The third process of titanium alloy bar is the process of filling billet extrusion, which is an important method that can be used to produce complex cross-section products. The process includes: the preparation of the sleeve cavity, and the cavity size according to the required final product size plus extrusion coefficient is determined; set. The powder loaded into the cavity and vibration shaking; sleeve of the evacuation, exhaust and sealing; in a certain temperature and extrusion ratio for extrusion; stripping the sleeve.
