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, 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 comprises a cavity (5) and a nozzle (8);
• and is rigidly connected with a piston (4) of the pressure loading unit and a heating body (6) of the high-temperature loading unit through the cavity (5), at least one strain gauge (22) of the pressure detection unit, and the nozzle (8), respectively;
• the high-temperature loading unit comprises the heating body (6), at least one ceramic heater (7) and a micro ceramic heater (24) which are embedded and installed inside the heating body (6) and the piston (4), respectively;
• the temperature detecting unit comprises at least one thermocouple (13) and a micro thermocouple (21), which are embedded and installed inside the heating body (6) and the piston (4), respectively;
• the pressure loading unit comprises the piston (4), a rocker (15), and a crank (17);
• a wire (1) of the wire conveying unit extends to the pressure loading unit and is in interference fit with an inner wall of the piston (4) to form a first-stage pressure loading;
• the piston (4), the rocker (15) and the crank (17) are connected through a first hinge (14) and a second hinge (16), respectively;
• the pressure detecting unit comprises the at least one strain gauge (22) and a micro strain gauge (23), which are embedded and installed on an inner wall of the cavity (5) and a 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.