CN-121973450-A - Pressure early calibration method for 3D printing equipment and 3D printing equipment

CN121973450ACN 121973450 ACN121973450 ACN 121973450ACN-121973450-A

Abstract

The application provides a pressure early calibration method of 3D printing equipment and the 3D printing equipment. Relates to the field of 3D printing. The method comprises the steps of responding to a calibration printing instruction, respectively executing a linear region printing operation and a broken line region printing operation, and carrying out image acquisition on the printed linear region and broken line region to obtain a corresponding linear printing image and a corresponding broken line printing image, wherein the calibration printing instruction is at least generated based on a calibration printing code corresponding to a test image which is pre-built by printing, the test image is a reference image based on which the pressure is calibrated in advance and comprises the linear region and the broken line region, the linear region at least comprises one straight line, the broken line region at least comprises two broken lines, and a target pressure advance value is determined based on the linear printing image and the broken line printing image. The method aims at improving the accuracy of pressure advanced calibration.

Inventors

Shang Jigeng

Assignees

原子重塑科技(深圳)有限公司

Dates

Publication Date: 20260505
Application Date: 20260331

Claims (15)

1. A pressure advance calibration method for a 3D printing device, comprising: responding to a calibration printing instruction, respectively executing a linear region printing operation and a broken line region printing operation, and carrying out image acquisition on the printed linear region and broken line region to obtain a corresponding linear printing image and a corresponding broken line printing image, wherein the calibration printing instruction is at least generated based on a calibration printing code corresponding to a test image which is pre-constructed by printing, the test image is a reference image based on which the pressure is calibrated in advance and comprises a linear region and a broken line region, the linear region at least comprises one straight line, and the broken line region at least comprises two broken lines; And determining a target pressure advance value based on the linear printing image and the broken line printing image, wherein the target pressure advance value is used as a pressure advance value corresponding to a target printing task to be executed later.
2. The method of claim 1, wherein the polyline areas include at least two polyline sets, each polyline set comprising at least two polylines, each polyline being a polyline that comprises at least one corner.
3. The method of claim 1, wherein the performing a line area printing operation and a polyline area printing operation in response to a calibration print command, respectively, and performing image acquisition on the printed line area and polyline area to obtain corresponding line print images and polyline print images, and determining a target pressure advance value based on the line print images and the polyline print images, comprises: responding to a first calibration printing instruction, executing the printing operation of the linear region according to a first pressure advance value, and acquiring an image of the printed linear region to obtain a corresponding linear printing image, wherein the first calibration printing instruction comprises the first pressure advance value; determining a second calibration print instruction based on the rectilinear print image and the first pressure advance value, the second calibration print instruction including a plurality of second pressure advance values; responding to a second calibration printing instruction, executing the printing operation of the broken line area according to the second pressure advance values, and carrying out image acquisition on the printed broken line area to obtain a corresponding broken line printing image; The target pressure advance value is determined from the plurality of second pressure advance values based on the polyline print image.
4. A method according to claim 3, wherein the number of second pressure advance values is the same as the number of fold lines contained in the fold line region.
5. The method of claim 3, wherein the first pressure advance value is the same as one of the plurality of second pressure advance values or the first pressure advance value is different from all of the plurality of second pressure advance values.
6. The method of claim 3, wherein the determining a second calibrated print command based on the rectilinear print image and the first pressure advance value comprises: determining the plurality of second pressure advance values based on the end form of the straight line in the straight line print image and the first pressure advance values, wherein the end form comprises any one of material accumulation, material breakage or normal molding; the second calibration print instruction is generated based on the plurality of second pressure advance values.
7. The method of claim 6, wherein the determining a plurality of second pressure advance values based on the end morphology of the line in the line print image and the first pressure advance value comprises: judging whether the first pressure advance value is adaptive or not based on the tail end form of the straight line in the straight line printing image; Generating a corresponding first pressure advance value range based on a judgment result of the first pressure advance value; And adjusting the first pressure advance value range to obtain a second pressure advance value range, wherein the second pressure advance value range comprises the plurality of second pressure advance values.
8. The method of claim 7, wherein generating a corresponding first pressure advance value range based on the determination of the first pressure advance value comprises: If the terminal form represents that the terminal of the straight line is normally molded, taking a preset reference range as the first pressure advance value range, wherein the reference range comprises the first pressure advance value; If the end morphology characterizes the end material accumulation of the straight line, increasing the end value of the reference range to obtain the first pressure advance value range; And if the end morphology represents the end material fracture of the straight line, reducing the end value of the reference range to obtain the first pressure advance value range.
9. The method of claim 7, wherein said adjusting said first pressure advance value range to obtain a second pressure advance value range comprises: And adjusting the end point value of the first pressure advance value range according to a pressure advance constraint condition to obtain the second pressure advance value range, wherein the pressure advance constraint condition comprises that the minimum second pressure advance value is not smaller than zero, the difference between the maximum second pressure advance value and the minimum second pressure advance value is a preset threshold value, and the preset threshold value is determined based on the number of broken lines included in the broken line area and a preset gradient step length.
10. The method of any one of claims 1-9, wherein a line width of each fold line in the fold line region is consistent with a line width of a straight line in the straight line region, and a line segment spacing between any two adjacent fold lines is determined based on the line widths of the fold lines.
11. The method of any of claims 1-9, wherein the fold angle of each fold line in the fold line region is determined based on at least one of current print requirements, current consumables, and current printhead parameters.
12. A pressure advance calibration method for a 3D printing device, comprising: Responding to a calibration printing instruction, respectively executing a first pattern area printing operation and a second pattern area printing operation, and carrying out image acquisition on the printed first pattern area and second pattern area to obtain a corresponding first pattern printing image and a corresponding second pattern printing image, wherein the calibration printing instruction is at least generated based on a calibration printing code corresponding to a test image which is pre-constructed by printing; And determining a target pressure advance value based on the first pattern printing image and the second pattern printing image, wherein the target pressure advance value is used as a pressure advance value corresponding to a target printing task to be executed later.
13. The method of claim 12, wherein the printed first pattern area is used at least to characterize the corresponding printing effect in the case of discrete step changes in the extrusion instructions, and/or, The second pattern area is used for representing the corresponding printing effect under the condition that the direction of the printing path is changed.
14. The method of claim 13, wherein the first pattern area comprises a straight line area, the first pattern print image comprises a straight line print image, the second pattern area comprises a broken line area, the second pattern print image comprises a broken line print image, the straight line area comprises at least one straight line, and the broken line area comprises at least two broken lines.
15. The 3D printing equipment is characterized by comprising a printing head, an image acquisition assembly and a controller, wherein the printing head and the image acquisition assembly are connected with the controller; The printing head is used for executing printing operation to form a printing object; the image acquisition component is at least used for acquiring the image of the printing object obtained based on the printing operation; the controller for controlling performing a pressure advance calibration method of a 3D printing apparatus according to any one of claims 1-11 or 12-14.

Description

Pressure early calibration method for 3D printing equipment and 3D printing equipment Technical Field The application relates to the field of 3D printing, in particular to a pressure early calibration method for 3D printing equipment and the 3D printing equipment. Background In the technical field of 3D printing, in the printing process of fused deposition modeling equipment, an extrusion mechanism of the fused deposition modeling equipment needs to accurately control the extrusion amount of materials according to a motion track so as to ensure the uniformity and the modeling precision of printing lines. Pressure Advance (Pressure Advance) is used as a dynamic compensation technology, and aims to optimize the material output response of an extruder when the movement speed changes, so that the Pressure Advance (Pressure Advance) is one of key links for improving the printing quality. At present, a common pressure advance calibration method generally depends on printing a simple and single standard test pattern, and cannot fully reflect the influence of a PA value on various conditions of printed lines, such as line continuity, material accumulation or breakage and the like. Meanwhile, when calibrating, operators need to visually observe apparent defects of lines in the pattern, such as continuity of the lines, material accumulation or breakage and the like, and manually adjust pressure advance values according to the apparent defects, however, manual visual evaluation is greatly influenced by subjective factors, the accuracy is low, and the calibrating process depends on experience and has low efficiency. Disclosure of Invention The embodiment of the application provides a pressure advanced calibration method for 3D printing equipment and the 3D printing equipment, which are characterized in that test images are designed to comprise different test patterns, images corresponding to the different test patterns are respectively acquired, and comprehensive analysis is carried out on the images, so that the pressure advanced value can be automatically calibrated more comprehensively, accurately and efficiently, and the subsequent printing quality is ensured. In a first aspect, an embodiment of the present application provides a pressure advance calibration method for a 3D printing apparatus, including: responding to a calibration printing instruction, respectively executing a linear region printing operation and a broken line region printing operation, and carrying out image acquisition on the printed linear region and broken line region to obtain a corresponding linear printing image and a corresponding broken line printing image, wherein the calibration printing instruction is at least generated based on a calibration printing code corresponding to a test image which is pre-constructed by printing; And determining a target pressure advance value based on the linear printing image and the broken line printing image, wherein the target pressure advance value is used as a pressure advance value corresponding to a target printing task to be executed subsequently. According to the technical scheme, the test printing comprising the straight line area and the broken line area is executed, the actual printing image is acquired, the image data reflecting extrusion continuity and extrusion uniformity when the direction changes are obtained, and then the target pressure advance value capable of simultaneously optimizing the straight line uniformity and the broken line corner quality is determined based on comprehensive analysis of the two types of image data. In the mode, printing manifestations of different geometric features are converted into quantifiable image data, so that the fundamental transition from the judgment based on manual experience to the automatic analysis based on the image data in the pressure advance value calibration is realized, and the objectivity and consistency of the pressure advance value calibration are improved. In addition, based on the test images containing different patterns, the limitation of the traditional single test pattern in the aspect of testing comprehensiveness is overcome, and the accuracy of the calibration result is further improved. In one possible embodiment, the fold line area comprises at least two fold line groups, each fold line group comprising at least two fold lines, each fold line being a fold line comprising at least one fold angle. In this embodiment, printing, collecting and analyzing are performed based on the pattern, and extrusion uniformity of different groups or different folding lines under the same and different rotation angles can be compared and analyzed, so that under the same printing condition, the performances of different folding line groups can be transversely compared to verify the matching degree of the pressure advance value under different geometric characteristics. In one possible embodiment, in response to a calibration print instruction, per