CN-121535222-B - 3D printing process monitoring system and method based on high-speed two-dimensional swinging mirror

CN121535222BCN 121535222 BCN121535222 BCN 121535222BCN-121535222-B

Abstract

The application relates to the technical field of 3D printing, in particular to a 3D printing process monitoring system and method based on a high-speed two-dimensional swinging mirror. The application realizes the rapid optical scanning of the working surface by arranging the high-speed two-dimensional swinging mirror in front of the object light path of the imaging lens group, the controller firstly divides the working surface into target lattices and then calculates the diopter lattice of the liquid zoom lens according to the current printing layer number and the object distance of each point, in the actual detection process, the controller drives the high-speed two-dimensional swinging mirror to sequentially point to each target point, and simultaneously controls the liquid zoom lens to adjust the focal length in real time according to the preset diopter lattice, thereby ensuring that the industrial camera can obtain clear images at each point, solving the problem of high-precision imaging in a large visual field range, avoiding adverse effects caused by mechanical vibration in a pure optical scanning mode, ensuring that the whole detection process is more efficient, the system structure is simple, and the detection precision and reliability are improved.

Inventors

LI LINGJIANG
LI SHANGMING

Assignees

广州安特激光技术有限公司

Dates

Publication Date: 20260508
Application Date: 20260116

Claims (3)

1. The 3D printing process monitoring method based on the high-speed two-dimensional swinging mirror is characterized by comprising the following steps of: the device comprises an industrial camera, an imaging lens group consisting of a fixed focus lens and a liquid zoom lens, a high-speed two-dimensional swing lens and a controller; the high-speed two-dimensional swing mirror is arranged in front of an object space light path of the imaging lens group and is used for receiving light rays from a working surface of the 3D printing equipment and reflecting the light rays to the imaging lens group; The imaging lens group is arranged between the high-speed two-dimensional swing mirror and the industrial camera and is used for converging reflected light and imaging on a sensor of the industrial camera; the controller is respectively and electrically connected with the industrial camera, the driving unit of the liquid zoom lens and the driving unit of the high-speed two-dimensional swing mirror; the controller is configured to: Dividing the working surface into a target lattice, Determining the diopter lattice of the liquid zoom lens according to the current printing layer number and the object distance of each point in the target lattice, Controlling the high-speed two-dimensional swinging mirrors to swing in sequence so as to lead the imaging light path to be aligned with each point in the target dot matrix, When the high-speed two-dimensional oscillating mirror reaches each point position, the liquid zoom lens is controlled to adjust to the corresponding diopter for focusing according to the diopter lattice, Controlling the industrial camera to acquire images at focusing points so as to realize regional monitoring of the working surface; The method comprises the following steps: dividing a working surface of the 3D printing equipment into a target lattice; Determining a diopter lattice of the liquid zoom lens according to the current printing layer number and the object distance of each point in the target lattice; Controlling the high-speed two-dimensional swinging lens to swing in sequence, so that an imaging light path formed by the high-speed two-dimensional swinging lens, the liquid zoom lens and the fixed focus lens is aligned to each point in the target dot matrix; when the high-speed two-dimensional oscillating mirror reaches each point, controlling the liquid zoom lens to adjust to the corresponding diopter according to the diopter lattice for focusing; Controlling an industrial camera to acquire images at focusing points so as to realize regional monitoring of a working surface; Before the step of controlling the high-speed two-dimensional swinging mirror to swing in sequence, the method further comprises the following steps: receiving a powder spreading start signal or a sintering start signal from 3D printing equipment; If a powder spreading start signal is received, starting to execute point position scanning and image acquisition processes after delaying for a first preset time so as to detect powder spreading quality; If a sintering start signal is received, starting to execute point position scanning and image acquisition processes after delaying for a second preset time so as to detect sintering quality; According to the type of the received starting signal, automatically calling a target image analysis model, wherein the type of the starting signal comprises the powder paving starting signal and the sintering starting signal, and the target image analysis model comprises an image analysis model corresponding to powder paving quality detection and an image analysis model corresponding to sintering quality detection; After the industrial camera collects images, the images are transmitted to an image processing unit for asynchronous detection and analysis; Determining a diopter lattice of a liquid zoom lens, comprising the steps of: And calculating the diopter corresponding to each point in the target dot matrix under the current printing layer number through the linear relation between the pre-calibrated object distance and diopter so as to form the diopter dot matrix.
2. The method for monitoring the 3D printing process based on the high-speed two-dimensional oscillating mirror according to claim 1, wherein the fixed focus lens is a tele lens.
3. The method for monitoring the 3D printing process based on the high-speed two-dimensional oscillating mirror according to claim 1, wherein the step of dividing the working surface into the target dot matrix comprises the following steps: Dividing the working surface into grid-shaped lattices P [ C ] [ R ] of C rows and R columns according to the size of the working surface and the view field size of the industrial camera; the diopter lattice is correspondingly denoted F [ C ] [ R ] [ N ], where N is the current number of print layers.

Description

3D printing process monitoring system and method based on high-speed two-dimensional swinging mirror Technical Field The application relates to the technical field of 3D printing, in particular to a 3D printing process monitoring system and method based on a high-speed two-dimensional swinging mirror. Background With the rapid development of 3D printing technology, metal 3D printing has gradually moved from laboratory stage to industrial application. In the high-end manufacturing fields of aerospace, medical equipment and the like, the quality requirements on 3D printing parts are higher and higher, so that real-time quality monitoring of the printing process becomes a key link for ensuring the quality of products. The existing 3D printing process monitoring technology mainly adopts a fixed top camera imaging scheme, and performs integral imaging detection on a working surface by installing a high-resolution industrial camera at the top of a printing cabin. In addition, the method also comprises the step of acquiring three-dimensional contour data of the printing layer by adopting a laser contour scanning technology in a line scanning mode. However, the fixed top camera must use a small focal length lens to obtain a sufficient field of view, resulting in reduced resolution, while expanding the field of view by mechanical displacement reduces detection efficiency while introducing mechanical shock interference, and the multi-camera approach significantly increases system cost and complexity, which is still further improved. Disclosure of Invention In order to realize the rapid detection of a large visual field range on the premise of ensuring the detection precision, avoid the interference of mechanical vibration, and simultaneously keep the system simple in structure and low in cost, the application provides a 3D printing process monitoring system and method based on a high-speed two-dimensional swinging mirror, which adopts the following technical scheme: in a first aspect, the present application provides a 3D printing process monitoring system based on a high-speed two-dimensional oscillating mirror, comprising: the device comprises an industrial camera, an imaging lens group consisting of a fixed focus lens and a liquid zoom lens, a high-speed two-dimensional swing lens and a controller; the high-speed two-dimensional swing mirror is arranged in front of an object space light path of the imaging lens group and is used for receiving light rays from a working surface of the 3D printing equipment and reflecting the light rays to the imaging lens group; The imaging lens group is arranged between the high-speed two-dimensional swing mirror and the industrial camera and is used for converging reflected light and imaging on a sensor of the industrial camera; the controller is respectively and electrically connected with the industrial camera, the driving unit of the liquid zoom lens and the driving unit of the high-speed two-dimensional swing mirror; the controller is configured to: dividing the working surface into a target lattice; Determining a diopter lattice of the liquid zoom lens according to the current printing layer number and the object distance of each point in the target lattice; controlling the high-speed two-dimensional oscillating mirror to oscillate in sequence, so that an imaging light path is aligned to each point in the target dot matrix; when the high-speed two-dimensional oscillating mirror reaches each point, controlling the liquid zoom lens to adjust to the corresponding diopter according to the diopter lattice for focusing; and controlling the industrial camera to acquire images at the focusing points so as to realize regional monitoring of the working surface. According to the technical scheme, the 3D printing process monitoring system based on the high-speed two-dimensional oscillating mirror is provided, the high-speed two-dimensional oscillating mirror is arranged in front of an object light path of an imaging lens group, rapid optical scanning of a working face is achieved, the working face is divided into target lattices by a controller firstly, then diopter lattices of a liquid zoom lens are obtained through calculation according to the current printing layer number and object distances of all points, in an actual detection process, the controller drives the high-speed two-dimensional oscillating mirror to sequentially point to all target points, meanwhile, the liquid zoom lens is controlled to adjust focal length in real time according to preset diopter lattices, clear images of an industrial camera can be obtained in all points, the problem of high-precision imaging in a large visual field range is solved, adverse effects caused by mechanical vibration are avoided through a pure optical scanning mode, the whole detection process is more efficient, the system structure is simple, and detection accuracy and reliability are improved. Optionally, the fixed focus lens is a tele len