A double-beam laser rapid prototyping manufacturing method based on laser ultrasound

Abstract

The invention discloses a dual-beam laser rapid forming and manufacturing method based on laser ultrasound. The method is characterized by adopting a coaxial powder feeding manner through metal powderand laser, taking a laser heat source as a main heat source for melting metal powder and depositing and forming, exciting a laser melting pool by means of high-frequency pulse laser to generate an ultrasonic energy field so as to form a dense and fine-grained deposition layer texture structure in the melting and solidifying process. The method comprises the following steps: (1) adjusting relativepositions of main heat source laser and pulse oscillation laser and enabling energy of a pulse oscillation laser beam to act on a tail area of the molten pool; (2) setting a cooperative working modeof energy of a main heat source laser beam and the pulse oscillation laser beam; (3) setting an action mode of the pulse oscillation laser beam; and (4) starting forming and manufacturing programs andstarting forming and manufacturing processes until a manufacturing process is completed. The dual-beam laser rapid forming and manufacturing method based on laser ultrasound is capable of improving density of molten and solidified structures of materials, increasing heterogeneous nucleation rate in the melting pool, accelerating homogeneous nucleation and enabling grain growth in the solidifyingprocess of the melting pool to be obviously refined.

Description

technical field [0001] The invention relates to three-dimensional rapid prototyping manufacturing, in particular to a laser ultrasonic-based double-beam laser rapid prototyping manufacturing method. Background technique [0002] Three-dimensional rapid prototyping (additive manufacturing) technology is an advanced manufacturing technology developed by the multidisciplinary integration of information technology, new material technology and manufacturing technology. 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 additive manufacturing at home and abroad: one is from the early laser rapid prot...

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Problems solved by technology

Moreover, the aluminum alloy component itself has good thermal conductivity, which results in insufficient energy absorption of the laser during the aluminum alloy additive manufacturing process.

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