CN111780693A - Method for detecting flatness of 3D printing powder spreading surface - Google Patents
Method for detecting flatness of 3D printing powder spreading surface Download PDFInfo
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- CN111780693A CN111780693A CN202010556976.2A CN202010556976A CN111780693A CN 111780693 A CN111780693 A CN 111780693A CN 202010556976 A CN202010556976 A CN 202010556976A CN 111780693 A CN111780693 A CN 111780693A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
A method for detecting flatness of a 3D printing powder spreading surface belongs to the technical field of 3D printing and is used for solving the problems that cost waste and defective product height caused by the fact that the flatness of the powder spreading surface cannot be timely known, and the method comprises the steps that an image acquisition device, an image detection module and a printing control system are arranged on the 3D printing device, and the image acquisition device, the image detection module and the printing control system are electrically connected; the image acquisition equipment is used for acquiring an image of the powder spreading surface; the image detection module receives the powder spreading face image from the image acquisition equipment and detects and judges the powder spreading face image; and the printing control system receives a detection judgment result of the powder paving surface image from the image detection module and sends a corresponding instruction according to the detection judgment result. The method avoids poor product quality caused by uneven powder spreading surface and continuous printing, effectively reduces the defective rate of printing and saves the production cost.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a detection method for 3D printing equipment.
Background
The 3D printing technology is an additive manufacturing technology, and includes a melt extrusion technology, a 3DP technology, and the like, wherein in application of the 3DP technology, in order to obtain a good printed product, the thickness of a layer printed each time and the surface quality of each layer are required to be controlled, the smaller the thickness of the layer is, the better the compactness of the product is, the better the performance is, and the better the surface quality of the layer is, the better the interlayer bonding property of the product is. The layer thickness can be set and is also determined by the accuracy of the device; the surface quality of the layer is related to the raw material used, the running speed of the equipment and the precision of the powder spreader. Under the condition that the precision of the equipment is not adjustable, how to effectively control the surface quality of the layer surface becomes a key factor for determining the quality of the product.
Disclosure of Invention
In view of the problem that the smoothness of the 3D printed powder laying surface cannot be effectively controlled, a method for detecting the smoothness of the 3D printed powder laying surface is needed, the method judges the smoothness of the powder laying surface by collecting an image of the powder laying surface and feeds back uneven area information to a control system in real time, so that poor product quality caused by continuous printing when the powder laying surface is uneven is avoided, the printing reject ratio is effectively reduced, and the production cost is saved.
A method for detecting flatness of a 3D printing powder spreading surface comprises the steps that an image acquisition device, an image detection module and a printing control system are arranged on a 3D printing device, and the image acquisition device, the image detection module and the printing control system are connected with one another; the image acquisition equipment is used for acquiring an image of the powder spreading surface; the image detection module receives the powder spreading face image from the image acquisition equipment and detects and judges the powder spreading face image; and the printing control system receives a detection judgment result of the powder paving surface image from the image detection module and sends a corresponding instruction according to the detection judgment result.
Further, light source equipment is further arranged on the 3D printing equipment and used for providing illumination for the powder paving surface, so that the image acquisition equipment can obtain a clear powder paving surface image.
Further, the image detection module is used for detecting information such as an uneven area, the depth of the uneven area, the proportion of the uneven area and the like of the powder spreading surface and feeding back the detected information of the uneven area of the powder spreading surface to the printing control system.
The technical scheme of the invention has the beneficial effects that: according to the invention, the image acquisition equipment is arranged at the powder paving surface accessory of the 3D printing equipment, and the image of the powder paving surface printed in real time is transmitted to the image detection module, so that the real-time monitoring of the flatness of the powder paving surface is realized, and the defects of poor products and waste of production cost caused by the fact that the unevenness of the powder paving surface exceeds a specified range are avoided.
Detailed Description
While the invention has been described in detail with the aim of providing a more clear illustration of the technical solution according to the invention, it is obvious that the following description is of some exemplary embodiments of the invention, from which other solutions can be derived by a person skilled in the art without inventive step.
A method for detecting flatness of a 3D printing powder spreading surface comprises the following specific implementation processes:
s001, arranging image acquisition equipment above a powder spreading surface of the 3D printer, preferably arranging light source equipment above the powder spreading surface to illuminate the powder spreading surface, so that the image acquisition equipment can obtain a clearer powder spreading surface image; the image detection module is arranged in the printing control system, and the image acquisition equipment, the image detection module and the printing control system are connected to transmit and receive data among each other;
s002, after the powder paving device finishes paving one layer, the printing control system sends out an image acquisition signal, the image acquisition equipment acquires an image of the current powder paving surface according to the instruction to form an image of the current powder paving surface, and the image of the current powder paving surface is transmitted to the image detection module; specifically, in this embodiment, the image capturing device may be a high-definition camera, and photographs the current powder spreading surface, and transmits an obtained photograph of the current powder spreading surface to the image detecting module;
s003, the image detection module judges the flatness of the received current powder paving surface image according to the setting, specifically judges the number of uneven areas, the proportion of the uneven areas, the depth of the uneven areas and the like of the current powder paving surface, and feeds back the detection judgment result to the printing control system;
s004, the printing control system sends out corresponding action instructions according to the detection judgment result, and specifically comprises the following steps: if the detection judgment result shows that no uneven area exists, sending a normal printing continuing instruction, and skipping to S002; if the detection judgment result is that an uneven area exists, the operation goes to S005;
s005, if the proportion of the uneven area is larger than the set value, the number of layers with the proportion of the uneven area larger than the set value is larger than the set value continuously, or the proportion of the uneven area is larger than the set value and the depth of the uneven area exceeds the set value, sending an alarm and stopping printing instruction; if one of the two conditions is not met, an optimized printing instruction is sent, and the step is shifted to S002.
Specifically, the image detection module performs flatness judgment by comparing color differences of the images to identify areas with obvious inconsistent color differences in the images, wherein the areas with obvious color differences are areas with uneven powder spreading surfaces; calculating the proportion of the uneven area to the whole powder spreading surface; further, by analyzing the color depth of the uneven area, the depth of the uneven area is theoretically deduced.
Specifically, the optimized printing instruction realizes the adjustment of the blanking amount by adjusting the vibration frequency, the feeding gap and the moving speed of the powder spreader, and adjusts the scraping force of the powder spreader and the powder spreading surface by adjusting the contact angle of the powder spreader and the powder spreading surface, so as to make up for the defect of uneven powder spreading surface of the previous layer.
As an improvement of this embodiment, the image capturing device may further include a plurality of image capturing devices, which are disposed at different positions of the powder spreading surface, so as to realize all-directional capturing of the powder spreading surface and ensure that the whole powder spreading surface can be captured. The condition is suitable for the situation that the total area of the powder spreading surface is larger than the area which can be collected by a single image collecting device.
As another improvement of this embodiment, the image capturing device may be further disposed on a powder spreader of the 3D printing device, so as to achieve follow-up real-time dynamic collection of powder spreading surfaces. The arrangement can save installation of the mechanical structure of the image acquisition equipment, and can also realize the unevenness of the powder spreading surface in the first time, so that disqualification can be found in the first time while the judging and printing efficiency is improved, and the waste of raw materials caused by redundant powder spreading is avoided.
The above embodiment is only a description of a typical application of the technical solution of the present invention, and may be reasonably expanded without creative efforts.
Claims (9)
1. A method for detecting the flatness of a 3D printing powder spreading surface is characterized in that the method for detecting the flatness of the 3D printing powder spreading surface comprises the steps that an image acquisition device, an image detection module and a printing control system are arranged on a 3D printing device, and the image acquisition device, the image detection module and the printing control system are connected with one another; the image acquisition equipment is used for acquiring an image of the powder spreading surface; the image detection module receives the powder spreading face image from the image acquisition equipment and detects and judges the powder spreading face image; and the printing control system receives a detection judgment result of the powder paving surface image from the image detection module and sends a corresponding instruction according to the detection judgment result.
2. The method of detecting 3D printing dusting flatness of claim 1, wherein the image capture device is disposed above the dusting surface.
3. The method for detecting the flatness of a 3D printing powder laying surface as claimed in claim 2, wherein the image capturing device is provided with a plurality of stages.
4. The method for detecting the flatness of the 3D printing powder spreading surface as claimed in claim 1, wherein the image acquisition device is arranged on a powder spreader of the 3D printing device, and the follow-up real-time dynamic acquisition of the powder spreading surface image is realized.
5. The method for detecting the flatness of the powder spreading surface in 3D printing according to claim 1, wherein a light source device is further arranged, and the light source device is arranged above the powder spreading surface.
6. The method for detecting the flatness of the 3D printing powder spreading surface according to claim 2, wherein the method for detecting the flatness of the 3D printing powder spreading surface comprises the following steps:
collecting data of the current powder spreading surface by using image equipment;
feeding back the acquired data to an image detection module;
feeding back the detection judgment result to the printing control system;
the printing control system sends out a corresponding instruction according to the detection judgment result, and if the currently powder-spread surface is flat, a continuous printing instruction is sent out; if the current powder spreading surface is not flat and does not exceed the set value, sending an optimized printing instruction; and if the current powder spreading surface is not flat and exceeds a set value, sending a printing stopping instruction and giving an alarm.
7. The method for detecting the flatness of the powder spreading surface in 3D printing according to claim 6, wherein the optimized printing instruction is to adjust the blanking amount by adjusting the vibration frequency, the feeding gap and the moving speed of the powder spreader, and the scraping force of the powder spreading surface is adjusted by adjusting the contact angle of the powder spreader and the powder spreading surface.
8. The method for detecting the flatness of the powder spreading surface in the 3D printing as claimed in claim 7, wherein the concrete implementation process comprises:
s001, arranging image acquisition equipment above the powder spreading surface of the 3D printer; the image detection module is arranged in the printing control system, and the image acquisition device, the image detection module and the printing control system are electrically connected to transmit and receive data among each other;
s002, after the powder paving device finishes paving one layer, the printing control system sends out an image acquisition signal, the image acquisition equipment acquires an image of the current powder paving surface according to the instruction to form an image of the current powder paving surface, and the image of the current powder paving surface is transmitted to the image detection module;
s003, the image detection module judges the flatness of the received current powder paving surface image according to the setting, specifically judges the number of uneven areas, the proportion of the uneven areas, the depth of the uneven areas and the like of the current powder paving surface, and feeds back the detection judgment result to the printing control system;
s004, the printing control system sends out corresponding action instructions according to the detection judgment result, and the method specifically comprises the following steps: if the detection judgment result shows that no uneven area exists, sending a normal printing continuing instruction, and skipping to S002; if the detection judgment result is that an uneven area exists, the operation goes to S005;
s005, if the proportion of the uneven area is larger than the set value, the number of layers with the proportion of the uneven area larger than the set value is larger than the set value continuously, or the proportion of the uneven area is larger than the set value and the depth of the uneven area exceeds the set value, sending an alarm and stopping printing instruction; if one of the two conditions is not met, an optimized printing instruction is sent, and the step is shifted to S002.
9. The method for detecting the flatness of the powder spreading surface in 3D printing according to claim 8, wherein the method for judging the flatness by the image detection module is to compare the color difference of the image and identify the region with obvious inconsistent color difference in the image, and the region with obvious color difference is the region with uneven powder spreading surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010556976.2A CN111780693B (en) | 2020-06-18 | 2020-06-18 | Method for detecting flatness of 3D printing powder spreading surface |
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| CN202010556976.2A CN111780693B (en) | 2020-06-18 | 2020-06-18 | Method for detecting flatness of 3D printing powder spreading surface |
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| CN111780693A true CN111780693A (en) | 2020-10-16 |
| CN111780693B CN111780693B (en) | 2022-03-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117058154A (en) * | 2023-10-13 | 2023-11-14 | 西安空天机电智能制造有限公司 | Defect identification method, system and medium for 3DP metal printing powder spreading process |
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| CN208410766U (en) * | 2018-06-04 | 2019-01-22 | 陕西恒通智能机器有限公司 | A kind of adjustable power spreading device of powdering amount and laser 3D printing machine |
| CN110181062A (en) * | 2019-06-06 | 2019-08-30 | 华南理工大学 | A kind of quick power spreading device for powder plate Rolling compund |
| US10589352B2 (en) * | 2015-09-24 | 2020-03-17 | Markforged, Inc. | Molten metal jetting for additive manufacturing |
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2020
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Patent Citations (5)
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| CN101850326A (en) * | 2009-03-31 | 2010-10-06 | 研能科技股份有限公司 | Device for quantitatively supplying powder and spreading powder in sections |
| US10589352B2 (en) * | 2015-09-24 | 2020-03-17 | Markforged, Inc. | Molten metal jetting for additive manufacturing |
| CN106925785A (en) * | 2017-05-08 | 2017-07-07 | 长沙新材料产业研究院有限公司 | A kind of 3D printing equipment and control method |
| CN208410766U (en) * | 2018-06-04 | 2019-01-22 | 陕西恒通智能机器有限公司 | A kind of adjustable power spreading device of powdering amount and laser 3D printing machine |
| CN110181062A (en) * | 2019-06-06 | 2019-08-30 | 华南理工大学 | A kind of quick power spreading device for powder plate Rolling compund |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117058154A (en) * | 2023-10-13 | 2023-11-14 | 西安空天机电智能制造有限公司 | Defect identification method, system and medium for 3DP metal printing powder spreading process |
| CN117058154B (en) * | 2023-10-13 | 2024-03-12 | 西安空天机电智能制造有限公司 | Defect identification method, system and medium for 3DP metal printing powder spreading process |
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| CN111780693B (en) | 2022-03-22 |
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Effective date of registration: 20220209 Address after: 298, ningshuo South Street, Yinchuan economic and Technological Development Zone, Ningxia Hui Autonomous Region Applicant after: KOCEL INTELLIGENT EQUIPMENT Co.,Ltd. Address before: 750021 building 4, Yinchuan science and technology building, Liupanshan Road, Jinfeng District, Yinchuan City, Yinchuan City, Ningxia Hui Autonomous Region, national intelligent casting industry innovation center Applicant before: NATIONAL INTELLIGENT FOUNDRY INDUSTRY INNOVATION CENTER |
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