Metal additive manufacturing extrusion mechanism for monitoring and improving mechanical properties in situ

A metal additive manufacturing extrusion mechanism for monitoring and improving mechanical properties in situ, comprising a wire conveying unit, a composite cavity unit, a high-temperature loading unit, a temperature detecting unit, a pressure loading unit, a pressure detecting unit and an in-situ monitoring unit, wherein the composite cavity unit is rigidly connected with a piston (4) of the pressure loading unit and a heating body (6) of the high-temperature loading unit through its cavity (5), a strain gauge (22) and a nozzle (8), respectively;

• a ceramic heater (7) in the high-temperature loading unit and a micro ceramic heater (24) are embedded and installed inside the heating body (6) and the piston (4), respectively;
• a thermocouple (13) in the temperature detecting unit and a micro thermocouple (21) are embedded and installed inside the heating body (6) and the piston (4), respectively;
• the wire (1) in the pressure loading unit is in interference fit with the inner wall of the piston (4) to form the first-stage pressure loading;
• the piston (4), a rocker (15) and a crank (17) are connected through a first hinge (14) and a second hinge (16), respectively;
• a strain gauge (22) in the pressure detecting unit and a micro strain gauge (23) are embedded and installed on the inner wall of the cavity (5) and the top end of the piston (4), respectively;
• and a substrate (9) is provided with a three-degree-of-freedom movement control system, which moves relative to the metal additive manufacturing extrusion mechanism.