A laser-excited ultrasonic energy field assisted plasma arc-loaded powder additive manufacturing method

Abstract

The invention discloses a laser-excited ultrasonic energy field-assisted plasma arc-loaded powder additive manufacturing method. The method adopts the method of coaxial powder feeding of metal powder and plasma arc, and uses the plasma arc heat source as a melting metal powder to deposit and shape it. The main heat source, with the help of high-frequency pulsed laser energy, impacts the plasma arc molten pool, excites and generates the ultrasonic energy field of the molten pool, so that the melting process of the molten pool forms a dense and fine-grained deposit layer fused structure, which includes the following steps: 1) Adjust the relative position of the plasma arc torch and the laser output head so that the laser energy acts on the tail area of ​​the plasma arc molten pool; 2) Set the cooperative working mode of the plasma arc current pulse and the laser pulse; 3) Set the laser beam action mode; 4 ) from the beginning of the forming manufacturing process to the completion of the manufacturing process. It can improve the density of the fused structure of the material, increase the heterogeneous nucleation rate in the molten pool, promote uniform nucleation, and significantly refine the grain growth during the solidification process of the molten pool.

Description

technical field [0001] The invention relates to high-efficiency additive manufacturing, in particular to a laser-excited ultrasonic energy field-assisted plasma arc-loaded powder additive manufacturing method. Background technique [0002] Modern additive manufacturing (3D printing) technology is an advanced manufacturing technology that integrates and develops information technology, new material technology and manufacturing technology. It is known as a representative technology that is expected to produce the "third industrial revolution". The leading technology for the development of individualized manufacturing models. After just over 20 years, this technology has achieved rapid development, and has broad application prospects in many fields such as aerospace, micro-nano manufacturing, and biomedical engineering. The technical basis of additive manufacturing of metal components is welding / connection. In the past 20 years, two major breakthroughs have been achieved in ad...

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Problems solved by technology

However, in this technology, the pulsed laser is used as an auxiliary heat source, and its frequency is set low, which cannot stimulate the ultrasonic energy field generated by impacting the molten pool. The structure of the formed component is low in density, and the effect of grain refinement is not obvious.

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