Hot extrusion of titanium alloy rod is a kind of powder extrusion by raising the temperature in order to achieve full density of products and precise control over the composition of materials and the internal structure of alloys. The hot extrusion method can be divided into two forms: enveloped hot extrusion method and non-enveloped hot extrusion method.
For the active metal titanium and titanium alloy powder, the hot extrusion canning method is often used in order to prevent the oxidation of the product. At this point, the first selection of the canning or casing, the powder or compaction should be packed in the canning or casing, after pre-pumping and sealing, it is placed in the extruder during hot extrusion.
At this time, the canning or casing materials used should have good thermoplasticity and do not form all gold with titanium material. Besides, it has the advantages of easy to peel , convenient source and low cost after hot extrusion. The more used is low carbon steel or stainless steel sheet.
The first process of hot extrusion of titanium alloy rod is to combine forming, sintering and hot working together, so as to directly obtain the drill products with better mechanical properties.
The second process is to form titanium and titanium alloy powder. After sintering, the prepared sintered billet is hot extruded (for Ti-32Mo alloy, the temperature is 1000-1100℃) to obtain the properties of titanium alloy products. Effect of extrusion ratio on properties of titanium materials. Titanium with theoretical density of 98.6%-99.1% can be obtained.
The third process of titanium alloy rod is the extrusion process of filling billet, which is an important method that can be used to produce complex section products. The process includes: preparing the casing cavity, and the cavity size is determined according to the required size of the final product with plus the extrusion coefficient. The powder is put into the cavity and shaken by vibration. Blowing, venting and sealing of the sleeve; Extruding at a certain temperature and extrusion ratio; Peel the canning or casing.