Real-time monitoring method in electron beam fuse deposition additive manufacturing

Abstract

The invention relates to a real-time monitoring method in electron beam fuse deposition additive manufacturing, belonging to the technical field of monitoring in electron beam forming manufacturing. The monitoring method realizes preheating and accompanying heat treatment of a workpiece while carrying out an electron beam fuse deposition process through a time-sharing multiplexing mode. The backscattered electronic signals of a preheating area, a molten pool area and an accompanying heat treatment area are collected in real time, the generated preheating area image is used for the path planning of the deposition process, the molten pool area image is used for the closed-loop control of the heat input of a molten pool, and the accompanying heat treatment area image is used for the defect detection of molded parts. The monitoring method provides three electron beam current control modes, and the power magnitudes of preheating, processing and heat treatment can be conveniently adjusted according to needs. The monitoring method is based on the backscattering electron imaging principle and can be adapted to the environment of large beam current and high metal vapor. Real-time imaging can be achieved without off-line scanning, which improves the production efficiency.

Description

technical field [0001] The invention relates to a real-time monitoring method for electron beam fuse deposition additive manufacturing, which belongs to the technical field of electron beam forming manufacturing monitoring. Background technique [0002] Process repeatability and quality consistency are the key to measuring this manufacturing technology, which is especially important in aerospace and medical fields. However, the environmental parameters in the electron beam forming manufacturing process are variable, such as the instability of equipment parameters, heat accumulation during the forming process, and changes in the composition of metal materials. This makes it impossible to achieve continuous stability of the forming process only relying on traditional techniques. In recent years, more and more electron beam forming manufacturers have added process monitoring technology to their equipment, the most of which is visual monitoring technology. However, there is st...

AI Technical Summary

Problems solved by technology

The disadvantage is that due to the low energy of the secondary electron itself, the flight time from the workpiece to the sensor is long, and the imaging time is long. It can only be imaged online during the forming interval after one layer is processed, but not during the forming period. Real-time imaging, which reduces productivity throughout the molding process

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