Real-time multi-parameter coordinating 3d printing auxiliary forming process for continuous fiber reinforced composites

A real-time multi-parameter coordinating 3D printing auxiliary forming process for continuous fiber reinforced composites, wherein an external auxiliary heating mechanism and an external auxiliary pressure mechanism are started timely based on physical characteristics of forming materials and requirements of a target component in combination with temperature and pressure during printing, to reduce an interlayer temperature difference and increase interlayer forming pressure to improve interlayer bonding strength of a forming component;

• meanwhile, an auxiliary mechanism accompanying mechanism is started timely according to an established printing trajectory to ensure that the relative positions of an auxiliary mechanism and a printing device are kept unchanged, to realize sustainable multi-parameter coordinating 3D printing for continuous fiber thermoplastic composites;
• specific steps are as follows:
• step 1:
• obtaining a 3D printing process file comprising process parameters and forming trajectories according to a 3D printing path planning method of the continuous fiber thermoplastic composites in combination with geometric information and performance requirements of the target component, and importing into a 3D printer;
• step 2:
• determining whether the direction of the printing trajectory is changed during the printing of a layer according to the trajectory information in the 3D printing process file;
• if so, starting the auxiliary mechanism accompanying mechanism;
• adjusting the position of the auxiliary mechanism in real time according to the change of the direction of the printing trajectory to control coordination between the movement of the auxiliary mechanism and the change of the printing trajectory so that the relative positions of the auxiliary mechanism and the printing device are kept unchanged, to proceed to step 3;
• if not, proceeding to step 3 directly;
• step 3:
• determining printing interlayer pressure Fm according to printing material properties and the requirements of the target component, and collecting an interlayer pressure signal F0 during printing;
• judging whether the height/width ratio of the target component is less than 7;
• if so, enabling a continuous printing method;
• if not, enabling a breakpoint printing method;
• ensuring that breakpoints of two adjacent layers are evenly spaced in a vertical direction, and formulating and implementing the external auxiliary pressure mechanism in real time;
• step 4:
• judging whether a layer to be printed is a first layer in the printing;
• if so, proceeding to step 6 directly;
• if not, proceeding to step 5;
• step 5:
• determining a printing interlayer temperature difference Tm according to the printing material properties and the requirements of the target component, and formulating and implementing the external auxiliary heating mechanism in real time according to the collected temperature difference signal T0 between two adjacent printing layers which are laid and newly laid during printing;
• step 6:
• judging whether a completed printing layer is a last layer after the printing of the layer;
• if so, ending the forming;
• if not, repeating steps 2 to 6 until the target component is printed.