Additive manufacturing equipment for magnetic confinement processing of overhanging structural part and method

Abstract

The invention discloses additive manufacturing equipment for magnetic confinement processing of an overhanging structural part and a method. The additive manufacturing equipment comprises a 3D printing device, and an external magnetic field generating device and a molten pool morphology online monitoring device are installed on the two sides of a spray nozzle of the 3D printing device, the output of the molten pool morphology online monitoring device is connected with the input of a central control system, the output of the central control system is connected with the control input of the external magnetic field generating device through a magnetic field control system, the molten pool morphology online monitoring device monitors molten pool morphology characteristics and transmits information to the central control system in real time, the central control system analyzes and compares the morphology with an ideal molten pool morphology, adjusts parameters in real time and transmits an adjustment instruction to the magnetic field control system, the magnetic field control system executes the instruction and changes the magnitude and direction of current in the external magnetic field generating device, and the external magnetic field generating device applies a local magnetic field to constrain the molten pool morphology, provides magnetic pressure to promote interlayer bonding, and meanwhile stirs a molten pool. According to the additive manufacturing equipment for magnetic confinement processing of the overhanging structural part and the method, the additive manufacturing cost is reduced, the interlayer bonding strength is improved, and the forming quality and the forming precision are improved.

Description

technical field [0001] The invention belongs to the technical field of metal additive manufacturing, and in particular relates to an additive manufacturing equipment and method for magnetically constrained processing of a suspension structure. Background technique [0002] Due to its unique process advantages, metal additive manufacturing technology has been used more and more in the field of manufacturing complex components. There are still many challenges in the existing metal additive manufacturing technology when forming components with complex overhanging features. At present, there are mainly two forming modes of additive manufacturing overhanging feature components. For additive manufacturing modes using fixed or single-degree-of-freedom substrates, the molten pool sags or even falls off under the action of gravity, resulting in reduced interlayer bonding strength. Therefore, support structure-assisted forming has become one of the most common methods for processing ...

AI Technical Summary

Problems solved by technology

The distance between the electromagnetic platform and the molten pool in the Chinese patent (notification number is CN 108621420 A) is relatively large, so the magnetic field strength attenuates faster, reduces the control sensitivity, and can only form a vertical upward magnetic force, resulting in the moistening of the molten pool. Insufficient moisture, easy to produce ball effect and delamination

The Chinese patent (notification number is CN109703018 A) adopts the magnetic levitation mode to suspend the entire printed part, and the magnetic field strength that needs to be provided is relatively large, so it is limited to the printed parts with light forming quality, and the molten pool cannot be stirred

There is no magnetic pressure in the Chinese patent (the announcement number is CN 109759587A), only gravity provides the interlayer pressure, resulting in insufficient interlayer bonding strength, and lack of stirring effect of the molten pool, which is not conducive to the escape of bubbles in the molten pool and the uniformity of alloying elements distributed

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