Interlayer ultrasonic peening assisted high-performance CMT electric arc additive manufacturing method and device

Abstract

The invention belongs to the technical field of composite additive manufacturing of metal structural parts, and particularly relates to an interlayer ultrasonic peening assisted high-performance CMT electric arc additive manufacturing method and device. Through alternate work of the cold metal transition electric arc additive manufacturing control device and the harmonic wave ultrasonic impact control device, regulation and control of stress and tissue in the forming process of the electric arc additive component are achieved, and the strengthening effect is more thorough. Harmonic ultrasonic impact treatment is carried out on an interlayer bonding interface in the CMT electric arc additive manufacturing process, interface residual tensile stress is effectively eliminated, uniform plastic deformation is generated, and therefore the size of primary thick and large columnar beta crystals is regulated and controlled, and anisotropy of mechanical performance of a component is improved; the effects of reducing the grain size, eliminating metallurgical defects and integrally improving strength and plasticity are achieved.

Description

technical field [0001] The invention belongs to the technical field of composite additive manufacturing of metal structural parts, in particular to a method and a device for interlayer ultrasonic impact assisted high-performance CMT arc additive manufacturing. Background technique [0002] Arc additive manufacturing technology is a digital manufacturing technology that uses the principle of layer-by-layer cladding, uses the arc as the heat source, and gradually forms metal parts according to the three-dimensional digital model through the addition of wires. Compared with the additive manufacturing method of powder accumulation, it has significant advantages such as high deposition efficiency, high wire utilization rate, short overall manufacturing cycle, and low cost, and is especially suitable for the integrated forming of large-sized components. And CMT (Cold Metal Transfer) arc additive manufacturing technology, through the short arc and wire reversing wire feeding monito...

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Problems solved by technology

[0003] However, during the CMT arc additive forming process, the material undergoes multiple complex thermal cycles, resulting in the accumulation of internal stress and the increase of residual tensile stress, and the formed parts are prone to defects such as deformation and sag; and metallurgical defects such as unfused, involved In addition, from the perspective of the boundary scale, the arc additive method will produce penetrating coarse columnar crystals along the additive direction, which cannot be made by surface treatment alone. It meets the service requirements, and it is necessary to introduce interlayer control treatment to inhibit the growth of coarse columnar crystals

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