SLM forming method based on intelligent scanning path planning and product

Abstract

The invention belongs to the related technical field of additive manufacturing, and particularly discloses an SLM forming method based on intelligent scanning path planning and a product. The method comprises the following steps that (a), when a three-dimensional model of a to-be-formed part is sliced, part contour information included in a plurality of slice layers and each slice layer are obtained; (b) for each slice layer, the slice contour is divided into a plurality of areas according to the part contour information in the slice layer, and the geometric feature of each area is obtained; (c), a laser scanning path corresponding to each area is planned according to the geometrical characteristics of each area, and a scanning sequence of each area is set so as to obtain the scanning sequences and the laser scanning paths of all the areas in each slice layer; and (d), the slice layers of the to-be-formed part are machined layer by layer according to the scanning sequences and the scanning paths, and the needed part is obtained. According to the SLM forming method based on intelligent scanning path planning and the product, the problem of difference of process requirements of different characteristics of the same part during SLM forming is solved, and the quality of the formed part is improved.

Description

technical field [0001] The invention belongs to the technical field related to additive manufacturing, and more specifically relates to an SLM forming method and product based on intelligent scanning path planning. Background technique [0002] Selective Laser Melting (SLM) is one of the fastest-growing additive manufacturing technologies in recent years. It uses metal powder (such as stainless steel, titanium alloy, copper alloy, etc.) For planning information, high-power laser is used to scan layer by layer, so that the metal powder in the scanned area is melted and solidified to form, and the unscanned area is still in a discrete state, thus forming layer by layer. The method is not limited by the complexity of the formed parts, does not need special matching tooling molds, and has good mechanical effects and high precision of the formed parts, so it has a good application prospect. [0003] In the SLM forming process, laser parameters play a vital role in the quality of...

AI Technical Summary

Problems solved by technology

At present, there are many related patents. By partitioning each layer of slices, different areas are scanned with angle changes to reduce the possibility of thermal stress concentration, but the essence of the scanning method remains unchanged (such as scanning distance and scanning route). Unable to intelligently optimize the scanning strategy by identifying local special geometric features

For example, the patent CN201711190187.6 proposes a multi-partition scanning method, which divides each slice into multiple regions, and uses parallel lines with different angles to scan each region line by line, which can make the stress generated by laser scanning more dispersed and reduce warping The possibility of deformation, but there is no fundamental change in the scanning strategy of each area, which will still generate large thermal stress for parts with special geometric features (such as sharp corners, thin walls, lattice structures, etc.); patent CN201811632180. In X, a partitioned serpentine scanning planning method is proposed to effectively avoid excessive thermal stress caused by large-format and large-spot processing. However, this serpentine scanning method is used in each area, and the scanning method cannot be optimized based on special geometric features.

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