CN-121972683-A - Defect control method, device, equipment and storage medium based on laser powder bed additive manufacturing

CN121972683ACN 121972683 ACN121972683 ACN 121972683ACN-121972683-A

Abstract

The invention discloses a defect control method, device and equipment based on laser powder bed additive manufacturing and a storage medium. The method comprises the steps of obtaining a scanning area of a current forming layer through a three-dimensional model of a part, carrying out discretization processing on the scanning area to obtain a scanning vector set, wherein the scanning vector set comprises a plurality of scanning vectors, introducing transverse displacement components orthogonal to a scanning advancing direction of the scanning vectors for each scanning vector through a path planning algorithm to obtain a reconstructed scanning vector, converting a swinging scanning path formed by the reconstructed scanning vectors into a control instruction sequence suitable for being executed by a galvanometer system, and completing laser scanning of a powder bed by combining the control instruction sequence. According to the method, the transverse displacement component is added for the scanning vector, and the swinging scanning mode is added under the original linear path, so that the formation of unfused defects can be reduced, and the control of metallurgical defects can be effectively realized.

Inventors

HU KAIMING
MA RUIQIN
LI XIANGPENG
LI MINGLIANG
YI JUNLAN

Assignees

上海飞机制造有限公司

Dates

Publication Date: 20260505
Application Date: 20260130

Claims (10)

1. A defect control method based on laser powder bed additive manufacturing, the method comprising: Acquiring a scanning area of a current forming layer through a three-dimensional model of the part; discretizing the scanning area to obtain a scanning vector set, wherein the scanning vector set comprises a plurality of scanning vectors; Introducing a transverse displacement component orthogonal to the scanning advancing direction of the scanning vector into the scanning vector by a path planning algorithm aiming at each scanning vector to obtain a reconstructed scanning vector; Converting a swing scanning path formed by the reconstructed scanning vectors into a control instruction sequence suitable for being executed by a galvanometer system; and combining the control instruction sequences to finish laser scanning of the powder bed.
2. The method of claim 1, wherein discretizing the scan region to obtain a set of scan vectors comprises: discretizing the scanning area by combining the scanning requirement of the preset selective laser melting to obtain a plurality of scanning vectors; dividing each scanning vector into a plurality of subsections according to the energy requirement and/or geometric characteristics of a scanning area, and setting scanning parameters for each subsection; and constructing a scanning vector set based on the scanning vectors with the set scanning parameters.
3. The method of claim 1, wherein each scan vector comprises a plurality of discrete control points, wherein introducing a transverse displacement component orthogonal to a scan direction of the scan vector to the scan vector via a path planning algorithm results in a reconstructed scan vector, comprising: carrying out coordinate recalculation on each discrete control point in the scanning vector through a path planning algorithm, and introducing a transverse displacement component orthogonal to the scanning advancing direction of the scanning vector to obtain a swing scanning vector; And taking the swing scanning vector as a reconstructed scanning vector.
4. A method according to claim 1 or 3, characterized in that after obtaining the reconstructed scan vector, the method further comprises: pre-compensating and smoothing the reconstructed scanning vector through response delay indexes and inertia indexes of the vibrating mirror to obtain a corrected scanning vector; adjusting the corrected scanning vector through preset vibrating mirror angle change and laser power output to obtain an adjusted scanning vector; And taking the adjusted scanning vector as a new reconstructed scanning vector.
5. A method according to claim 1 or 3, characterized in that after obtaining the reconstructed scan vector, the method further comprises: Acquiring a swing scanning path of a last forming layer of the current forming layer; Based on the swing scanning path of the last forming layer, performing staggered adjustment on the reconstructed scanning vector to obtain an adjusted scanning vector; and taking the adjusted scanning vector as a new reconstructed scanning vector.
6. A method according to claim 1 or 3, characterized in that after obtaining the reconstructed scan vector, the method further comprises: The reconstructed scanning vector is adjusted through the material thermophysical parameters, the layer thickness, the applicable scanning speed and the applicable laser power of the metal powder on the powder bed, so as to obtain an adjusted scanning vector; and taking the adjusted scanning vector as a new reconstructed scanning vector.
7. A method according to claim 3, wherein the path planning algorithm comprises at least a sine path planning algorithm, a cosine path planning algorithm, an elliptical path planning algorithm and a splay path planning algorithm; The sine path planning algorithm is as follows: ; The cosine path planning algorithm is as follows: ; the elliptical path planning algorithm is as follows: ; The splay path planning algorithm is as follows: ; Wherein, the For the amplitude of the wobble, For the wobble frequency, In order for the scan time to be within the desired range, For a constant velocity superimposed in the scanning direction, Is the scanning speed in the X-axis direction, The scanning speed in the Y-axis direction.
8. A defect control device based on laser powder bed additive manufacturing, the device comprising: The acquisition module is used for acquiring a scanning area of the current forming layer through the three-dimensional model of the part; The processing module is used for carrying out discretization processing on the scanning area to obtain a scanning vector set, wherein the scanning vector set comprises a plurality of scanning vectors; the reconstruction module is used for introducing a transverse displacement component orthogonal to the scanning advancing direction of each scanning vector to the scanning vector through a path planning algorithm to obtain a reconstructed scanning vector; The conversion module is used for converting a swing scanning path formed by the reconstructed scanning vectors into a control instruction sequence suitable for being executed by the galvanometer system; and the scanning module is used for combining the control instruction sequence to complete laser scanning of the powder bed.
9. An electronic device, the device comprising: at least one processor, and A memory communicatively coupled to the at least one processor, wherein, The memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the defect control method based on laser powder bed additive manufacturing of any one of claims 1-7.
10. A computer readable storage medium storing computer instructions for causing a processor to implement the defect control method based on laser powder bed additive manufacturing of any one of claims 1-7 when executed.

Description

Defect control method, device, equipment and storage medium based on laser powder bed additive manufacturing Technical Field The embodiment of the invention relates to the technical field of additive manufacturing, in particular to a defect control method, device and equipment based on laser powder bed additive manufacturing and a storage medium. Background The additive manufacturing technology is an advanced processing technology which subverts the traditional manufacturing technology principle, the parts are sliced in layers through slicing processing software on the basis of a three-dimensional model, and interaction with manufacturing equipment is realized by means of transmission of a computer. The current mainstream manufacturing process is a selective laser melting (SELECTIVE LASER MELTING, SLM) technology, and the main principle is that laser interacts with a powder bed to realize local powder melting and solidification, and layer by layer forming, and finally a complete part body is formed. For traditional powder bed additive manufacturing techniques, diffuse distribution of defect features are easy to form, and the defects easily cause significant performance degradation of the product, particularly for fatigue performance, the diffuse distribution of defects can lead to uncertain failure behavior of the part, so that engineering safety margin is extremely low. The unfused defects and the air hole defects are typical defects widely occurring in the additive manufactured parts, the fatigue life of the parts is shortened due to the higher porosity, and particularly the influence of surface and near-surface defects on the performance is severe, wherein a large part of reasons are that a micro molten pool cannot generate sufficient disturbance under the condition of rapid cooling, so that the defects are difficult to dissipate. Therefore, how to reduce the number and distribution of defects inside the additive package is a major issue. Disclosure of Invention The invention provides a defect control method, device, equipment and storage medium based on laser powder bed additive manufacturing, which are used for solving the problem that typical defects still exist in additive manufactured parts in the prior art. According to an aspect of the present invention, there is provided a defect control method based on laser powder bed additive manufacturing, the method comprising: Acquiring a scanning area of a current forming layer through a three-dimensional model of the part; discretizing the scanning area to obtain a scanning vector set, wherein the scanning vector set comprises a plurality of scanning vectors; Introducing a transverse displacement component orthogonal to the scanning advancing direction of the scanning vector into the scanning vector by a path planning algorithm aiming at each scanning vector to obtain a reconstructed scanning vector; Converting a swing scanning path formed by the reconstructed scanning vectors into a control instruction sequence suitable for being executed by a galvanometer system; and combining the control instruction sequences to finish laser scanning of the powder bed. According to another aspect of the present invention, there is provided a defect control device based on laser powder bed additive manufacturing, the device comprising: The acquisition module is used for acquiring a scanning area of the current forming layer through the three-dimensional model of the part; The processing module is used for carrying out discretization processing on the scanning area to obtain a scanning vector set, wherein the scanning vector set comprises a plurality of scanning vectors; the reconstruction module is used for introducing a transverse displacement component orthogonal to the scanning advancing direction of each scanning vector to the scanning vector through a path planning algorithm to obtain a reconstructed scanning vector; The conversion module is used for converting a swing scanning path formed by the reconstructed scanning vectors into a control instruction sequence suitable for being executed by the galvanometer system; and the scanning module is used for combining the control instruction sequence to complete laser scanning of the powder bed. According to another aspect of the present invention, there is provided an electronic device comprising at least one processor, and A memory communicatively coupled to the at least one processor, wherein, The memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the defect control method based on laser powder bed additive manufacturing of any one of the embodiments of the present invention. According to another aspect of the present invention, there is provided a computer readable storage medium storing computer instructions for causing a processor to execute the defect control method based on laser powder bed additive manufacturing according to any embodiment of