Powder spreading control method and device and readable storage medium

Abstract

The application relates to a powder spreading control method and device and a readable storage medium. One or more intermediate imagesare obtained throughdeviation calculation ofa current layer imageand one or more images stored in a database, and all the intermediate images are corroded to remove noise and normal sintered edges of to-be-printed workpieces, and then result images are obtained. According to the powder spreading control method and device and the readable storage medium, on the one hand, the problem of inaccurate judgment caused by change of the optical environment due to dust falling on a lens, a scraper, the peripheryofa cavity and a light source in the sintering process is solved; on the other hand, the problem that the optical reflectivity of different materials is not the same and consequently judgment is inaccurate is effectivelysolved; therefore, the powder spreading control method and device and the readable storage mediumare not only suitable for sintering of asingle material, but also suitable for mixed sintering of a variety of materials, detectionis more accurate, and a detection method is easier.

Description

technical field [0001] The present application relates to the technical field of additive manufacturing, and in particular to a powder spreading control method, device and readable storage medium. Background technique [0002] Additive manufacturing technology is an advanced manufacturing technology with distinctive features such as digital manufacturing, high flexibility and adaptability, direct CAD model drive, fast speed, and rich and diverse material types. tooling mold, so the application range is very wide. Selective Laser Sintering (SLS for short) and Selective Laser Melting (SLM for short) are the most rapidly developed additive manufacturing technologies in recent years. [0003] In additive manufacturing technology, after printing a workpiece, it is generally necessary to repeat the powder laying action thousands of times. Occasionally, there will be some accidents in the printing equipment during this process, resulting in missing laying powder, powder collapse, ...

AI Technical Summary

Problems solved by technology

[0003] In additive manufacturing technology, after printing a workpiece, it is generally necessary to repeat the powder laying action thousands of times. Occasionally, there will be some accidents in the printing equipment during this process, resulting in missing laying powder, powder collapse, and warping of the sintered workpiece. , support collapse, etc.

It may also be a problem with the product design itself, such as a defect in the support design that causes the workpiece to warp

The above-mentioned problems only need to occur once in the sintering process of thousands or tens of thousands of times. If they are not dealt with, the sintering of the entire workpiece will fail.

[0004] In order to solve the above-mentioned disadvantages brought about by the quality of powder spreading, some powder quality detection methods have also been proposed in the prior art. This method generally detects whether the overall gray value of the powder surface is consistent, or whether there is a difference between it and the ideal powder surface. Although this method can solve the above-mentioned technical problems, it is generally based on the premise that there is no problem with the equipment hardware, but there may be some changes in the hardware during the specific workpiece printing process. For example, the lens on the camera will accumulate more and more during the sintering process. More and more powder will affect the changes in the captured image, more and more powder will accumulate on the light source, resulting in gradual changes in the light source, reflections, etc.

The above hardware problems will lead to misjudgment of noodle quality detection, thus affecting the accuracy of detection

Images