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

A real-time monitoring and additive manufacturing technology, applied in electron beam welding equipment, manufacturing tools, additive processing, etc., which can solve the problems of long imaging time, low secondary electrons, and reduced production efficiency in the molding process.

Active Publication Date: 2019-03-15
TSINGHUA UNIV
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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 ...

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

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Embodiment Construction

[0053] The electron beam fuse deposition additive manufacturing real-time monitoring method proposed by the method of the present invention comprises the following steps:

[0054] (1) Emit a beam of high-energy electrons on the workpiece to be deposited and added, and the energy of the high-energy electron beam 9 is 10KeV-150KeV, such as figure 1 shown;

[0055] (2) When the deposition starts, the abscissa of the current deposition center of the additive workpiece 3 to be deposited is X c , deflect the high-energy electron beam in step (1), and sequentially scan the preheating area D on the workpiece to be deposited with additives 1 , processing area D 2 and heat treatment area D 3 , and for the preheating region D 1 , processing area D 2 and heat treatment area D 3 The high-energy electron beam current is adjusted according to the following formula:

[0056] Make preheating zone D 1 The high-energy electron beam current I 1 for:

[0057]

[0058] Among them, P 1...

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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...

Claims

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Application Information

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IPC IPC(8): B23K15/00B23K15/02B33Y50/02
Inventor 都东常树鹤张昊宇王力常保华彭国栋薛博策魏昂昂
Owner TSINGHUA UNIV
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