Additional material manufacturing single-unit scheduling method for selective laser melting process

Abstract

The invention relates to an additive manufacturing single-unit scheduling method for a selective laser melting process. According to the invention, the method comprises the steps: providing a single-target mathematical model taking minimization of the unit volume production cost of the part as an optimization target; based on the excellent performance of a distribution estimation algorithm which is shown in combination optimization problems such as production scheduling, and combining the neighborhood search strategy to solve the additive manufacturing single-machine scheduling problem considering the part construction direction; in an algorithm, providing a real number encoding mode including part sorting, job allocation and part construction direction; on the basis of the coding, generating a population through probability random sampling; on the basis, updating a probability model by sampling an elite population. In order to guarantee population diversity and avoid local optimization, after each generation of elite population is generated, individuals in the elite population are locally adjusted through neighborhood search, so an algorithm jumps out of a local extreme value, anda better solution is found.

Description

technical field [0001] The invention belongs to the technical field of production and manufacturing, and in particular relates to a single-machine scheduling method for additive manufacturing oriented to a selective laser melting process. Background technique [0002] Additive manufacturing (AM) technology refers to the technology of using computer-aided design to manufacture physical parts by adding materials layer by layer. It is also called rapid prototyping technology and 3D printing technology in its development process. The commonly used additive manufacturing technologies can be roughly divided into: fused deposition modeling (fised deposition modeling, FDM), stereolithography apparatus (SLA), selective laser melting (selective lasermelting, SLM) and so on. Among them, the SLM process is one of the fastest-growing technologies with the best application prospects because of its ability to manufacture metal parts that can be used directly. It is widely used in aerospace...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a single-machine scheduling method for additive manufacturing oriented to selective laser melting process. In order to solve the problem that the distribution estimation algorithm is easy to fall into local extremum, a neighborhood search strategy is proposed, and an improved distribution estimation is designed. The algorithm solves the model, and in the case of ensuring the delivery date of the parts, the processing combination and processing sequence of the parts on the additive manufacturing equipment are obtained

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