When the world started to produce
titanium tube parts, it also encountered a lot of troubles. Most of them are metalworkers and technicians who are familiar with aluminum tube parts, but they are not used to the forming of titanium tubes. First of all, in the cutting and trimming process, the cutting edge of the scissors wears too fast and becomes unbearable. When the shape of the hammer becomes unbearable, the hammer head is very easy to be arrogant and thick. During the knocking and repairing process, the bell springs back very high, and the parts and molds are full of hammer marks, but the parts cannot be made. Stick to the mold. Because of this, everyone calls titanium a difficult-to-form material, and industry personnel call it a hot-forming material, which is a more general and perceptual evaluation of the forming properties of titanium tubes. But this does not affect people's specific sub-folding of it, and when they understand its characteristics, in order to make appropriate processing.
Similar to other metals, the shrinkage behavior of titanium tube during casting also undergoes a change from liquid state to solid state and then to solid state. This shrinkage behavior is usually divided into volume shrinkage and line shrinkage. The volume shrinkage reflects the change of the entire volume during the casting process of the titanium tube. Since the total volume shrinkage is equal to the volume of the concentrated shrinkage cavity of the casting plus the volume of the shrinkage porosity, the solidification shrinkage behavior of the alloy casting process is related to the volume shrinkage of the alloy. The characteristics of shrinkage cavities and shrinkage porosity of drilled alloys are determined, which is of great significance for understanding the formation of shrinkage porosity and shrinkage defects of titanium tubes.
Important factors affecting the solidification shrinkage of titanium tubes include alloying elements, mold materials and mold structure. Since the alloying elements affect the crystallization temperature interval of the titanium tube, just like its effect on the fluidity, the solidification shrinkage of the titanium tube first depends on the characteristics of the added alloying elements, that is, the crystallization temperature formed between the titanium and the alloying elements. The size of the interval is related. The eutectic titanium tube with narrow crystallization temperature interval has good fluidity and is easy to form concentrated shrinkage holes, while the titanium tube with wide crystallization temperature interval has poor fluidity and is easy to form dispersive shrinkage holes, that is, shrinkage porosity.
Because titanium tube has a series of good physical properties, as an excellent structural material, it can compete with stainless steel and nickel alloy for application scope: in many sectors of the national economy, the use of titanium tube improves product life and improves The reliability and productivity of the equipment, the speeding up of the process, and the improvement of labor conditions, all of which have resulted in significant economic benefits.
