Inductance and ultrasound coupling-assisted method for direct laser deposition of metal material

Abstract

The invention relates to an inductance and ultrasound coupling-assisted method for direct laser deposition of a metal material, belongs to the field of additive manufacturing and relates to a coupledenergy field. The energy field is obtained by coupling an inductance temperature field and an ultrasonic wave field. A follow-up electromagnetic induction device is suspended right below a laser headthrough an induction coil, so that the coil moves along with the laser head to preheat and slowly cool a round area around a molten bath. A bottom ultrasonic device is fixed between a worktable and abase plate, and ultrasonic waves are conducted to the molten bath upward through the base plate to impact and stir the molten bath and a solid-liquid interface. The coupled energy field makes up defects that a single inductance temperature field has no stirring effect to the molten bath and a single ultrasonic wave field which is short in action time to the molten bath is not obvious in effect. Induction heating plays a preheating and slow cooling role to reduce a temperature gradient and to reduce a thermal stress. The temperature field improves the impacting and stirring efficiency to the molten bath effectively by alleviating the solidification rate of the molten bath. The coupled energy field can reduce defects of cracks and pores, so that the mechanical properties of a metal materialformed part are improved.

Description

technical field [0001] The invention belongs to the field of additive manufacturing and relates to a method for direct laser deposition of metal materials assisted by inductive ultrasonic coupling. Background technique [0002] Additive manufacturing technology has changed the previous casting, forging and conventional subtractive processing methods, greatly shortening the processing and manufacturing cycle of parts, and using the existing additive manufacturing technology has been able to manufacture parts with performance not lower than that of forgings. Thanks to the unique processing method of additive manufacturing, the design and creation space of designers has also been greatly expanded, and is no longer limited by traditional manufacturing methods. Additive manufacturing also makes the production of products more flexible and personalized, and can meet the actual needs of specific customers to a greater extent. Using the direct laser deposition additive manufacturin...

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Problems solved by technology

However, the heating efficiency at the bottom of the substrate is low, the heat loss is large, and it is impossible to heat a specific local area

[0006] Patent CN201910067776.8 reports a device and method for electromagnetic induction heating-assisted laser additive manufacturing of titanium-based composite materials. Two electromagnetic induction coils on the scanning path are used to preheat and slowly cool the formed parts, real-time heating and It has a small heat-affected zone, but the direction of the inductance coil needs to be constantly changed with the change of the scanning path, and an additional steering device is required, and the structure is complex; in addition, a single application of inductive heating cannot produce an impact stirring effect on the molten pool

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