Load balancing scanning forming method used for multilaser selective laser melting (SLM) forming device

Abstract

The invention belongs to the related technical field of additive manufacturing, and discloses a load balancing scanning forming method used for a multilaser selective laser melting (SLM) forming device. The method comprises the steps that (a) corresponding three-dimensional models are established for to-be-machined components, and the models are subjected to hierarchy slicing and discrete treatment to obtain model profiles of all discrete layers; (b) according to a certain algorithm, an optimized parting line is found out from an intermediate overlapping area between every two adjacent galvanometer scanning areas; and (c) all areas after optimized parting is completed are subjected to path programming and filling, and thus the whole load balancing scanning forming process is completed. Through the load balancing scanning forming method provided by the invention, the problems that currently, during machining of multilaser SLM forming equipment, the galvanometer set working efficiency is low, temperature field distribution is uneven, and the multilaser boundary area performance deteriorates can be effectively solved, and meanwhile, the method has the characteristics of high efficiency, high quality, convenient control and the like, so that the method is particularly suitable for manufacturing and application occasions of large-size workpieces of complex internal structures.

Description

Technical field [0001] The present invention belongs to the technical field related to additive manufacturing, and more specifically, relates to a load-balanced scanning forming method for a multi-laser SLM forming device. Background technique [0002] Selective Laser Melting (SLM) is a metal rapid prototyping method, which is based on the basic idea of ​​rapid prototyping "discrete-layer by layer", using metal powder as the processing raw material, and each layer is based on the discrete three-dimensional model The slice shape is scanned and formed layer by layer by laser on a powdered substrate. During the forming process, the metal powder is completely melted under the action of the laser and then cooled to complete the metallurgical bonding. Due to the advantages of short processing cycle, good forming quality, and the ability to process metal components with complex shapes, it has been widely used and developed in recent years. [0003] The selective laser melting equipment ...

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Problems solved by technology

[0006] In view of the above deficiencies or improvement needs of the prior art, the present invention provides a load-balanced scanning forming method for a multi-laser SLM forming device, in which the geometric structure of the three-dimensional model and the performance and characteristics of the multi-laser galvanometer system are fully considered , to perform more optimized and effective segmentation of each discrete layer of the workpiece, and at the same time ensure that the workload of each laser galvanometer system on the discrete plane of the layer is basically the same; compared with the existing technology, it can effectively solve the problem of current multi-laser In the processing of SLM molding equipment, there are problems such as low working efficiency of the galvanometer group, uneven distribution of the temperature field, and performance deterioration in the multi-laser overlapping area. Large-scale workpiece manufacturing applications with internal structures

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