The heating characteristics and hot rolling characteristics of die forging blades and bars for manufacturing fasteners. The batch materials used in the former Soviet Union for the manufacture of aerospace blades are titanium alloy bars such as BT3-1, BT8, BT9 and OT4 with a diameter of 10-60 mm. The material for aviation fasteners is generally BT16 titanium alloy rod with a diameter of 4.0-16mm.
The heating characteristics and hot rolling characteristics of BT3-1, BT8, BT9 and OT4 alloys determine the requirements for bar quality. For example, when hot rolling at the temperature of the ot + p phase region of the alloy, if the amount of deformation is not less than 40% -50%, then the plasticity and fatigue strength indexes of this material are the highest. However, rolling at this temperature can significantly increase the deformation resistance of the blank pass and the intermediate pass, increase the unit pressure, and overload the motor of the rolling mill.
In this case, the rolling process should be carried out in two stages:
(1) Pre-emulsify at a temperature higher than a + p-P transition;
(2) Rolled to the finished size at the temperature of the ot + P phase zone of the alloy. In the final rolling stage, the rolled material should be cooled to a temperature below 650T.
Bars with a diameter greater than 8.0mm, and rebars with a diameter of 4.0-8.0mm, should be rolled in one fire.
Timber Yield Rate Of Mechanical Equipment