Solid state additive method
A solid state additive method includes: disposing a round consumable rod in a hollow stirring tool; based on a coating layer height, setting a gap between a bottom surface of the hollow stirring tool and a base surface; driving the hollow stirring tool to rotate at a first rotation speed; driving the consumable rod to rotate at a second rotation speed, where the second rotation speed and the first rotation speed are different in angular speed to form a differential, such that the consumable rod rubs against an inner wall of the hollow stirring tool to generate thermal deformation so as to obtain a plastic deformation flow in the hollow stirring tool; pressing the consumable rod downward to enable the plastic deformation flow to be in friction contact with the base surface; translating the hollow stirring tool and stirring the base surface.
1 . A solid state additive method, forming a coating layer on a base surface by using a consumable rod, wherein the method comprises:
disposing the consumable rod in a hollow stirring tool, wherein, a cross-section of the consumable rod is round;
setting a gap between a bottom surface of the hollow stirring tool and the base surface based on a height of the coating layer;
driving the hollow stirring tool to rotate at a first rotation speed;
driving the consumable rod to rotate at a second rotation speed, wherein the second rotation speed and the first rotation speed are different in angular speed to form a differential, such that the consumable rod rubs against an inner wall of the hollow stirring tool to generate thermal deformation, to obtain a plastic deformation flow in the hollow stirring tool, wherein a temperature of the plastic deformation flow is lower than a melting temperature of the consumable rod;
pressing the consumable rod downward to enable the plastic deformation flow to be in friction contact with the base surface; and
translating the hollow stirring tool and stirring the base surface, such that the plastic deformation flow forms a coating layer on the base surface.
2 . The solid state additive method of claim 1 , wherein after the consumable rod is disposed in the hollow stirring tool, the method further comprises:
obtaining a real-time temperature of the hollow stirring tool and/or the consumable rod in the hollow stirring tool; and
determining whether the real-time temperature is lower than a preset temperature; if yes, heating the hollow stirring tool and/or the consumable rod in the hollow stirring tool to enable the consumable rod to generate the plastic deformation flow.
3 . The solid state additive method of claim 2 , wherein in the heating step, the hollow stirring tool and/or the consumable rod in the hollow stirring tool is heated by at least one of an induction heater, flame jet heating, laser heating, ultrasonic vibration heating, plasma jet heating or arc heating.
4 . The solid state additive method of claim 1 , further comprising:
obtaining a real-time temperature of the hollow stirring tool and/or the consumable rod in the hollow stirring tool;
determining whether the real-time temperature is higher than the preset temperature; if yes, cooling a bottom surface of the hollow stirring tool to adjust the temperature of the plastic deformation flow; and
wherein the bottom surface of the hollow stirring tool is preferably cooled by air cooling.
5 . The solid state additive method of claim 1 , wherein the first rotation speed and the second rotation speed are in a same direction and the first rotation speed is lower than the second rotation speed.
6 . The solid state additive method of claim 1 , wherein the first rotation speed and the second rotation speed are opposite in direction, such that the plastic deformation flow of an advance side of the consumable rod is reversely pushed by the hollow stirring tool to an advance side of the hollow stirring tool.
7 . The solid state additive method of claim 1 , wherein the step of pressing the consumable rod downward to enable the plastic deformation flow to be in friction contact with the base surface comprises:
radially supporting a middle portion of the consumable rod and then pressing the consumable rod downward to enable the plastic deformation flow to be in friction contact with the base surface.
8 . The solid state additive method of claim 1 , wherein the step of pressing the consumable rod downward to enable the plastic deformation flow to be in friction contact with the base surface comprises:
radially supporting an upper end of the consumable rod and then pressing a top end of the consumable rod downward to enable the plastic deformation flow to be in friction contact with the base surface.
9 . The solid state additive method of claim 1 , wherein the bottom surface of the hollow stirring tool is non-planar.
10 . The solid state additive method of claim 1 , wherein a bottom of the hollow stirring tool is detachably connected with at least one stirring needle.
11 . The solid state additive method of claim 1 , wherein a material of the consumable rod is a metal alloy material, a metal-ceramic composite material, or an organic material.
12 . The solid state additive method of claim 1 , further comprising:
cooling the base material to reduce the temperature of the coating layer.