Particle-based friction stir additive manufacturing device and additive manufacturing method

A particle-based friction stir additive manufacturing device, comprising:

• a shared working platform for fixing a substrate or a workpiece, and a plurality of groups of robot units, wherein the robot units perform an additive manufacturing operation using the shared working platform as a same operation reference plane;
• each robot unit comprises an industrial robot, an end effector, a wire feeding mechanism, and a material feeding mechanism;
• the end effector comprises:
• an electric spindle, wherein the electric spindle is fixed at a tail end of the industrial robot, and a stirring head is fixed at a driving end of the electric spindle;
• a tapered disc, wherein one end of the tapered disc is fixed to an exterior of the electric spindle and extends in a same direction as the stirring head;
• and
• a stationary shoulder, wherein the stationary shoulder is fixed to the other end of the tapered disc and is internally provided with a shoulder empty cavity corresponding to the stirring head;
• the stirring head passes through the shoulder empty cavity and protrudes from an outer end surface of the stationary shoulder;
• the stationary shoulder is provided with a wire inlet channel and a material feeding channel which extend from an outer wall to the shoulder empty cavity and are arranged intersecting with each other;
• and an axially outer end portion of the stationary shoulder is a forging plane;
• the wire feeding mechanism conveys wire to the wire inlet channel;
• and
• the material feeding mechanism comprises a pushing rod driving device and a pushing rod arranged at a driving tail end of the pushing rod driving device;
• the pushing rod corresponds to the material feeding channel, and can enter the material feeding channel under the driving of the pushing rod driving device, so as to cut the wire fed into the wire inlet channel to form metal particles, and push the metal particles into a space between the shoulder empty cavity and the stirring head via the material feeding channel;
• the stirring head rotates to heat and plasticize the metal particles, and subsequently fed particles extrude the previously fed and plasticized metal material out of the stationary shoulder, such that a deposition layer is formed between the forging plane and the substrate, and a portion of the metal material is stirred into the substrate or the already deposited layer by the stirring head, forming a metallurgical bond.