A device for ultrasonic-assisted laser additive manufacturing and its implementation method

Abstract

The invention discloses a device for ultrasonic-assisted laser additive manufacturing, which comprises a precision two-axis numerically controlled turntable mainly composed of a double-supported turntable and a processing table, a support and fastening base arranged on the processing table, and a support and fastening base arranged on the support and fastening base. A mold with a groove on the seat, an ultrasonic device installed through the processing table and a supporting fastening base and connected to the bottom of the mold, a substrate placed in the groove on the mold, and a Powder feeding nozzle. The invention also provides its realization method. In the present invention, the ultrasonic vibration is transmitted to the substrate to make it resonate, so that ultrasonic vibration is stirred inside the molten pool formed under the action of laser in the laser additive manufacturing process, resulting in cavitation effect and mechanical effect, and improving the relationship between layers. Combined with the state, the probability of forming pores and micro-segregation inside the formed part is reduced, while the grains are refined and the residual stress is reduced to obtain a formed part with excellent mechanical properties.

Description

technical field [0001] The invention belongs to the field of laser additive manufacturing, and specifically relates to an ultrasonic-assisted laser additive manufacturing device, which improves the internal quality of the laser additive manufacturing molten pool and reduces its internal stress by adding ultrasonic waves. Background technique [0002] Laser additive manufacturing technology (a type of 3D printing technology), as an important supplement to existing material processing technologies such as casting, forging, welding, etc., plays an important role in the rapid prototyping and repair of high-performance metal parts with complex structures. In the past 20 years, it has become one of the frontier research hotspots in the field of international material processing engineering and advanced manufacturing technology. At present, researchers at home and abroad have carried out a lot of research work on the equipment, technology, structure and performance of laser additiv...

AI Technical Summary

Problems solved by technology

[0003] However, in the forming process of laser additive manufacturing, the melting, solidification and cooling of materials are carried out under relatively fast conditions, and there are complex physical, chemical and metallurgical reactions inside the molten pool, which makes the formed workpiece prone to pore inclusion fusion Poor quality defects such as macro deformation cracking and micro cracks

In addition, due to the uneven local heating and stress distribution caused by the forming method, the final structure has heavy micro-segregation and special interface structure, which will also have a certain impact on the mechanical properties of the formed part.