Rolling titanium
Relevance
Initially it was planned to roll aluminum bars. Gradually the basic elements of industrial technology were improved. Heating methods, roll calibration, types of butt fittings and deformation modes were rationalized. Section rolling of semi-finished products showed advantages of the method over other methods of deformation. The comparison was made in terms of homogeneity of structure and mechanical properties, as well as in terms of accuracy of geometrical parameters and surface quality.
Currently, titanium section rolling is used for production of round bars with diameter of 10−150 mm, manufacture of bars with machined surface with diameter of 6−120 mm, manufacture of wire with diameter of 1 — 7 mm, as well as sections of hexahedral, square and other sections.
Rolling titanium
Technologically,titanium is very different from other metals. Firstly, it has a low thermal conductivity, so there is cooling of the peripheral layers of the metal with a loss of plasticity, which creates a significant unevenness of deformation over the section of the rolled material. Secondly, the low density impairs the capture of titanium by the rolls.
Cross helical rolling of titanium
The helical cross rolling (HCR) has been used for the last two decades in the production of titanium alloy wire. This method, in combination with closed-die forging and bar rolling, makes it possible to considerably expand the arsenal of production means and fits well into the general technological scheme of things. PVP has a number of features. First, work rolls (technological tool) are universal, their calibration does not depend on technological properties of used titanium alloys. This considerably reduces the tooling costs. Secondly, in order to reset the equipment to a different workpiece size, the work rolls just need to be brought together or apart in the stand. This allows a smooth change in the diameter of the rolled product and ensures high production accuracy. Thirdly, by means of infinitely variable adjustment of the rolling diameter, changing the feed angle and roller speed, the deformation-speed mode of production can be easily selected in a very wide range. Even at low rolling speeds, productivity is quite high. This can be explained by the fact that, depending on the type of work rolls and calibrations, in a single pass in the PVP stand the strain rate can be 20 — 90%.
Furnizor
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Buy a bargain price.
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