A Process Planning Method for Synchronous Powder Feeding Additive Manufacturing Based on Structural Features

Abstract

The invention provides a synchronous powder feeding additive manufacturing process planning method based on structural features, and relates to the technical field of additive manufacturing. In this method, titanium alloy structural parts are first divided into beams, frames, joints, wall panels and ribs, and the digital model of the parts is designed into a process digital model according to the characteristics of the synchronous powder feeding additive manufacturing process; then the process digital model Carry out layered slicing processing, divide the data of each layer according to the structural characteristics, and divide each type of titanium alloy structural parts into planar, cross, I-shaped, one-shaped, T-shaped and L-shaped ;Finally, the synchronous powder-feeding additive manufacturing process of structural features and optimization of process parameters are formed into a database, which is used for the follow-up investigation of the additive manufacturing process design of specific parts, and the efficient and high-quality completion of the additive manufacturing process design. The synchronous powder feeding additive manufacturing process planning method based on structural features provided by the present invention simplifies the difficulty of additive manufacturing process design, shortens the process design cycle, and improves the efficiency of process planning.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a process planning method for synchronous powder feeding additive manufacturing based on structural features. Background technique [0002] Laser Additive Manufacturing (Laser Additive Manufacturing, LAM, commonly known as 3D printing) is an integrated technology that takes into account material preparation and high-performance part forming, using alloy powder as raw material, through high-power laser in-situ metallurgical melting, rapid solidification and layer-by-layer accumulation. The principle is to use computer 3D software to design a 3D model of the part, and then perform a certain layered slicing process on the model to discretize the 3D model into a series of 2D layers, and then use laser scanning layer by layer, and add powder materials in the way of superposition forming. Computer 3D models are converted directly into solid parts. From the perspective o...

AI Technical Summary

Problems solved by technology

[0007] In view of the immature production equipment of the current synchronous powder feeding additive manufacturing technology, all of which are single production or small batch production, the synchronous powder feeding additive manufacturing process depends on the experience of the craftsmen to set relevant process parameters and adjust related equipment. The design experience of craftsmen is different. The experience of craftsmen takes time to accumulate, and there is no specific measurement index for personal experience, which is not easy to pass on. The qualification requirements for craftsmen are high. There is no uniform standard for human control, and the quality is unstable. To meet the demand, certain follow-up processing is required, with low efficiency and high risk

[0008] (2) The additive manufacturing process design of different parts cannot be used for reference, and the additive manufacturing process design must be designed in detail for each part, and the workload is huge

[0009] Different types of parts use different materials. Even if the materials are the same, parts with different structural configurations and sizes have different processes, and the quality of the molded parts is also different. The conditions of the molded parts of the products are different, the process window is narrow, and parameter setting is difficult. The design process of different craftsmen for similar parts is different, resulting in different internal organizational structures of the parts, which cannot be used for reference, and the process of each step cannot be passed on.

[0010] (3) High quality risk

[0011] The deformation and cracks in the additive manufacturing process come from the internal stress generated during the forming process, and the root cause of the internal stress is that the temperature gradient is too large. Different process personnel and different parts set different process parameters. In the powder feeding laser In the process of additive manufacturing process design, it is usually due to the fluctuation of a certain process parameter that the surface condition of the workpiece is not good. If it cannot be repaired in time, it will further lead to the failure of the process and even make the workpiece scrapped

Spheroidization may occur during the process, resulting in poor process stability, and sometimes additional processing procedures, resulting in poor quality consistency. The instability of the additive manufacturing process using powder as material is more serious, and there are risks that cannot be evaluated.

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