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Three-dimensional printing appratus and method for calibrating printing inaccuracy thereof

  • US 10,539,949 B2
  • Filed: 09/25/2015
  • Issued: 01/21/2020
  • Est. Priority Date: 06/05/2015
  • Status: Active Grant
First Claim
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1. A method for calibrating printing inaccuracy, adapted to calibrate at least a straight printing path of a printing head on a datum plane, wherein the datum plane is a reference plane of the printing head, wherein the datum plane is a XY plane in an XYZ coordinate system, wherein the printing head is controlled to move along the straight printing path and simultaneously feeds out a forming material so as to generate a layer object on a supporting surface, and the straight printing paths respectively comprise a starting point and an ending point, the method comprising:

  • obtaining three-dimensional printing information of the layer object;

    determining whether a path distance between the starting point and the ending point is greater than a threshold value;

    dividing the supporting surface into a plurality of first zones using a plurality of calibration position points of the supporting surface;

    determining a plurality of linear compensation relationships of each of the first zones using a plurality of first reference compensation values of the calibration position points at vertices of each of the first zones;

    dividing the first zones to obtain a plurality of second zones and calculating a plurality of second reference compensation values along the Z-axis respectively corresponding to the second zones;

    when the path distance between the starting point and the ending point is greater than the threshold value, then calculating a first compensation value of the starting point and a second compensation value of the ending point, both the first compensation value and the second compensation value being along a Z-axis, by using the linear compensation relationships respectively corresponding to the first zones of the supporting surface, calibrating a printing height corresponding to the starting point based on the first compensation value relative to a datum plane, calibrating a printing height corresponding to the ending point based on the second compensation value relative to the datum plane, wherein the first compensation value of the starting point and the second compensation value of the ending point are calculated by respectively inputting a position of the starting point and a position of the ending point into linear functions,when the path distance between the starting point and the ending point s not greater than the threshold value, thendetermining a common compensation value along the Z-axis by using at least one of the second reference compensation values of at least one of the second zones, wherein the at least one of the second zones is corresponding to the starting point and the ending point, andcalibrating the printing height corresponding to the starting point and the printing height corresponding to the ending point based on the common compensation value relative to the datum plane,wherein a calibrated path is determined based on the calibrated printing height of the starting point and the calibrated printing height of the ending point,wherein the method further comprises;

    controlling the printing head to move along the calibrated path and feeding out forming material to print out the layer object, and using the common compensation value or both the first compensation value and the second compensation value to compensate differences from the datum plane to the supporting surface and to adjust the height of the printing head while printing,wherein the method further comprises;

    repeatedly controlling the printing head to move respectively toward the calibration position points along a normal line direction of the datum plane at a predetermined height until the printing head is in contact with the calibration position points to respectively obtain the first reference compensation values respectively corresponding to the calibration position points relative to the datum plane,wherein the linear compensation relationships are the linear functions formed by the positions of the calibration position points and the first reference compensation values of the calibration position points.

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