A Method for Removing Pore Defects in Metal Additive Manufacturing Components Based on Online Monitoring

Abstract

A method for removing pore defects in metal additive manufacturing components based on online monitoring, including a set of DED metal additive manufacturing systems, a set of online monitoring systems for real-time monitoring of pore defect positions during the additive manufacturing process, and a set for performing defect detection. The repaired laser shock peening system and the central control system that coordinates the additive manufacturing process, the online monitoring process, and the laser shock peening process. The central control system controls the utilization of the laser shock peening system based on the pore distribution model obtained by the online monitoring system The high-energy pulsed laser performs interlayer 3D impact strengthening on the additive manufacturing sample. For the pore defect, the thin layer of metal above the defect is first crushed, and then the DED metal additive manufacturing system controls the feeding in the subsequent forming process to eliminate it. ; For cracks whose length direction is parallel to the manufacturing direction, the central control system closes the cracks by applying residual compressive stress, and the invention can remove the defects after detection.

Description

technical field

[0001] The invention relates to the technical field of additive manufacturing, in particular to a method for removing pore defects of metal additive manufacturing components based on online monitoring. Background technique

[0002] Directed Energy Deposition (DED) is an important branch in the field of metal additive manufacturing. Porosity and cracks are the most common defects inside it. First, these pores will produce microcracks, resulting in low mechanical strength; second. , due to the distribution of pores of different sizes and shapes throughout the space, it will also reduce the fatigue life of the entire component. At present, to control the internal pores in experiments and production practices, methods such as optimizing process parameters, selecting higher-quality raw materials or shielding gases are generally adopted, but even so, the internal pores of components cannot be completely eliminated. In order to discover the internal pores in real t...

Examples

Embodiment Construction

[0029] The method of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] Such as figure 1 As shown, a method for removing pore defects in metal additive manufacturing components based on online monitoring includes the following steps:

[0031] 1) Carry out three-dimensional modeling with computer CAD software to obtain a sample model with a size of 100mm*60mm*60mm, and use the DED metal additive manufacturing system slice layer software to layer the model and plan the path;

[0032] 2) The DED metal additive manufacturing system carries out the additive manufacturing process. The wire material AA5183 aluminum alloy is selected as the raw material to deposit the first layer of material. Since the single layer thickness of the WAAM process deposition material is large, the first 1 layer is selected in this embodiment. layer;

[0033] In the WAAM process deposition process, the wire feeding speed is 15....

technical field

[0001] The invention relates to the technical field of additive manufacturing, in particular to a method for removing pore defects of metal additive manufacturing components based on online monitoring. Background technique

[0002] Directed Energy Deposition (DED) is an important branch in the field of metal additive manufacturing. Porosity and cracks are the most common defects inside it. First, these pores will produce microcracks, resulting in low mechanical strength; second. , due to the distribution of pores of different sizes and shapes throughout the space, it will also reduce the fatigue life of the entire component. At present, to control the internal pores in experiments and production practices, methods such as optimizing process parameters, selecting higher-quality raw materials or shielding gases are generally adopted, but even so, the internal pores of components cannot be completely eliminated. In order to discover the internal pores in real t...

Examples

Embodiment Construction

[0029] The method of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] Such as figure 1 As shown, a method for removing pore defects in metal additive manufacturing components based on online monitoring includes the following steps:

[0031] 1) Carry out three-dimensional modeling with computer CAD software to obtain a sample model with a size of 100mm*60mm*60mm, and use the DED metal additive manufacturing system slice layer software to layer the model and plan the path;

[0032] 2) The DED metal additive manufacturing system carries out the additive manufacturing process. The wire material AA5183 aluminum alloy is selected as the raw material to deposit the first layer of material. Since the single layer thickness of the WAAM process deposition material is large, the first 1 layer is selected in this embodiment. layer;

[0033] In the WAAM process deposition process, the wire feeding speed is 15....

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