On-line monitoring method and system for three-dimensional printing

A three-dimensional printing on-line monitoring system, comprising:

• a printing parameter-controllable three-dimensional printing device and a three-dimensional high-precision nondestructive imaging system, wherein the printing parameter-controllable three-dimensional printing device comprises a PC, a controller, a print platform, printhead(s), an X/Y/Z three-axis mobile module and a printhead mounting arm, and the three-dimensional high-precision nondestructive imaging system comprises an imaging host and a sample detection probe,
• wherein the PC performs steps of:
• editing and analyzing a three-dimensional support model,
• editing printing parameters and detection parameters according to requirements,
• sending a processing instruction, and
• on-line monitoring in real time a structure of a currently printed body and errors resulting from accumulation and overlaying-adhesion of one or more layers of a printing material;
• the controller performs steps of receiving the processing instruction and controlling the printhead(s), the X/Y/Z three-axis mobile module and the printhead mounting arm;
• the imaging host which is connected with the PC performs steps of transmitting data and controlling the sample detection probe to complete scanning and imaging;
• and
• the sample detection probe is configured in such a way that the sample detection probe moves, in cooperation with the print platform or the printhead mounting arm, along an X axis/Y axis/Z axis, to complete one transverse area scanning and one longitudinal-depth scanning, and at the moment, the sample detection probe completes one detection, the printhead continues printing, and when a certain printing thickness is reached, detection is performed again, which are repeated until the printing is completed;
• and after completion, the PC reconstructs detected data into a three-dimensional high-resolution global image, thereby achieving full-longitudinal-depth imaging,
• wherein the printing parameters and the detection parameters edited by the PC comprise:
• an imaging depth H of the imaging host, an effective imaging depth h, a thickness h0 of a top portion of the effective imaging depth h that cannot be cured within a short time after printing, an initially detected printing thickness h+h0, with h+h0≤H, and a subsequently detected printing thickness h, wherein a value of the effective imaging depth h, a value of the subsequently detected printing thickness h and a value of h in the initially detected printing thickness are same.

A three-dimensional printing on-line monitoring method, comprising:

• acquiring monitoring information of a printer in a printing process, with the monitoring information comprising printing process control parameters and internal and external structural form information of a printed product;
• and comparing the monitoring information with preset parameters to determine whether the monitoring information conforms to the preset parameters,
• wherein if yes, a printing operation is continued according to input modeling parameters input into the printer, wherein the modeling parameters are hierarchical path parameters of a model;
• and
• if not, a matching judgment is performed on a reason why the monitoring information does not conform to the preset parameters, according to a comparison result between the monitoring information and the preset parameters, then an optimization adjustment is performed on the printing process control, and the printing operation is continued, wherein the three-dimensional printing on-line monitoring method is applied to a three-dimensional printing device comprising a control host that controls the printing device, wherein the method comprises:
• controlling the three-dimensional printing device to perform transverse scanning and longitudinal-depth scanning on a currently printed body of a printed object;
• and
• acquiring monitoring information of the three-dimensional printing device in a process of printing the printed object, the monitoring information comprising relevant printing control parameters and internal and external structural form information of the printed product in the printing process,
• the three-dimensional printing device further comprises an imaging host, and the step of performing transverse scanning and longitudinal-depth scanning on a currently printed body of a printed object comprises:
• segmenting the printed object according to an imaging depth H of the imaging host and an effective imaging depth h of the printed object, wherein each longitudinal-depth scanning comprises scanning one segment in a longitudinal depth, and scanning images are acquired in each transverse scanning and each longitudinal-depth segmented scanning until printing of the printed object is completed;
• and
• splicing and longitudinally superimposing all the acquired scanning images to obtain a three-dimensional high-resolution global image of the printed object.