Hot-spinning formation method for large-diameter titanium alloy cylindrical parts

A hot-spinning formation method for large-diameter titanium alloy cylindrical parts, wherein a to-be-machined workblank (3) is placed in a resistance furnace to be heated to 600-650° C., and is taken out of the resistance furnace after being maintained at this temperature for 0.5-1 h;

• the heated workblank (3) is disposed around a mandrel (2), and spinning is started when a maximum clearance between the workblank (3) and the mandrel (2) is less than 0.5 mm;
• after the spinning is ended, the workblank (3) is lifted by a pneumatic jack cylinder (5) to be removed from the mandrel, and when lifted to a designated position, the workblank (3) is completely removed from the mandrel, such that a titanium alloy cylindrical part is obtained;
• the hot-spinning formation method specifically comprises:
• Step 1:
• installing the mandrel (2) on a spinning lathe workbench (6);
• Step 2:
• starting the pneumatic jack cylinder (5), and enabling the pneumatic jack cylinder (5) to return to a working position;
• Step 3:
• placing the workblank (3) in the resistance furnace, heating the workblank (3) in the resistance furnace to 600-650° C., maintaining the workblank (3) at this temperature for 0.5-1 h, and then taking the workblank (3) out of the resistance furnace;
• Step 4:
• disposing the heated workblank (3), which is discharged out of the resistance furnace, around the mandrel (2), and clamping a lower end of the workblank (3) in a groove in the pneumatic jack cylinder (5);
• Step 5:
• when the heated workblank (3) shrinks to clamp the mandrel (2), starting spinning, and during the spinning process, enabling spinning rollers (4) to move downwards;
• Step 6:
• according to different passes of the spinning, repeating Step 5 in each pass of the spinning;
• and
• Step 7:
• when the spinning is ended, lifting, by the pneumatic jack cylinder (5), the workblank (3) to be removed from the mandrel, and when the workblank (3) is lifted to the designated position, completely removing the workblank (3) from the mandrel, such that the titanium alloy cylindrical part is obtained;
• a rotational speed of the mandrel (2) is 20-40rad/min, a feed ratio is 2-4 mm/rad, and a reduction of each pass is 4-8 mm;
• an outer diameter of the workblank (3) is not less than 3 m.