Method for the monobloc sizing for the tempering casings and device for implementing the method
View Patent ↗A device for implementing a method of sizing a cylindrical part following shaping, by plastic deformation, of a metallic material that has maximum structural shrinkage at a maximum-shrinkage temperature between a first temperature and a second temperature, which is lower than the first temperature, is disclosed. The method includes placing the part in a shaft furnace, heating the part to the first temperature, lowering and fitting into the part an internal-sizing tool with an outer diameter greater than an inner diameter of the part at maximum structural shrinkage, transporting the assembly formed by the part and the sizing tool to a tempering vessel, cooling the part to a temperature below said second temperature, and extracting the internal-sizing tool. The method applies to the manufacture of turbomachine casings.
1. A device for sizing a cylindrical part comprising:
a cylindrically shaped internal-sizing tool with an outer diameter which is greater than an inner diameter of the part at maximum structural shrinkage of the part;
a dummy bar provided with a vertical rod;
a frame provided below the dummy bar;
first and second members which attach the dummy bar with the frame;
articulated radial arms which support the part; and
a catching gripper which engages the vertical rod of the dummy bar,
wherein the internal-sizing tool is suspended by cables from said catching gripper;
wherein the arms are hingeably connected to the frame such that the arms are moveable between a vertical position and a horizontal position, and
wherein the arms are weighted such that the arms are in the vertical position when unloaded.
2. The device as claimed in claim 1 , wherein the catching gripper can be moved between a first position in which the catching gripper engages the vertical rod and a second position in which the dummy bar is suspended from the catching gripper by cables.
3. The device as claimed in claim 1 , wherein the frame is suspended by cables from said catching gripper.
4. The device as claimed in claim 1 , wherein the internal-sizing tool and the catching gripper are coaxial.