A method for shape control of ultrasonic vibration assisted arc additive manufacturing

Abstract

The invention discloses a method of shape and property control of electric arc additive manufacturing through assistance of ultrasonic vibration. In the process of electric arc additive manufacturing, non-contact ultrasonic vibration is applied to molten baths synchronously, grains in the molten baths are crushed, growth of the grains is restrained, and refinement of the grains is achieved. Meanwhile, by effectively utilizing residual heat of a formed part, the effect that a material in the position where a tool bit makes contact with the surface of a cladding layer is in a softened state is guaranteed, by applying ultrasonic vibration to the tool bit, the tool bit impacts the surface of the cladding layer at a high frequency, and finishing processing and surface reinforcing treatment are conducted on the surface, so that the dimension precision of the cladding layer is improved, the residual stress of the cladding layer is reduced, the surface grains are refined, and accordingly the purpose of shape and property control of electric arc additive manufacturing is achieved. According to the method, the roughening effect of the residual heat accumulation amount to the part grains and severe influences of warping deformation are reduced and even avoided, the service cycle of the tool bit is prolonged, and subsequent machining treatment of parts is reduced. The effective method is provided for shape and property control of the electric arc additive manufacturing technology.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a shape control method for ultrasonic vibration-assisted arc additive manufacturing. Background technique [0002] Additive manufacturing technology is based on the principle of discrete accumulation. With the assistance of computer, the molten raw material is deposited layer by layer by means of high energy beam (laser, electron beam, plasma, electric arc) as the heat source. Accumulation realizes mold-free and rapid prototyping of parts. Compared with additive manufacturing technologies based on lasers, plasma beams, and electron beams as heat sources, arc additive manufacturing technology has the advantages of low production cost, high deposition efficiency, and unlimited size of formed parts. It is especially suitable for manufacturing aerospace Manufacture of integral components such as medium and large scale, light weight, functional and complex....

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Problems solved by technology

For example, Professor Zhang Haiou of Huazhong University of Science and Technology (see Zhang Haiou, Xiong Xinhong, Wang Guilan, etc. Plasma deposition forming and milling finishing combined direct manufacturing metal parts technology [J]. China Mechanical Engineering, 2005, 16(20): 1863-1866 .) Combining additive manufacturing and milling process to solve the precision problem of additive manufacturing formed parts, in the deposition-milling composite process, usually when one or several layers are deposited, the surface of the deposition layer is milled flat, and then The deposition of the next layer is carried out. This process effectively solves the problem of surface unevenness in the height and width directions of the deposition layer, avoids the influence of the surface morphology of the previous deposition layer on the subsequent deposition layer, and improves the forming process. However, this process cannot effectively reduce or even eliminate the residual stress of each cladding layer, as well as the effect of refining the surface material grains; therefore, the mechanical properties of the formed parts cannot be fully utilized

In addition, as in Chinese patent 2010101476322, the arc deposition and rolling process are also combined to refine the microstructure of the formed part and improve the mechanical properties of the part. The dendrites in the clad layer can be further refined to improve the mechanical properties of the part. However, this process has certain limitations in improving the surface dimensional accuracy of the clad layer.

[0005] Aiming at the problem that it is difficult to achieve synchronous control in arc additive manufacturing, the invention discloses the use of non-contact ultrasonic vibration to stir the acoustic flow of the molten pool and the cutter head with controllable ultrasonic vibration intensity for each molten pool. The method of cladding surface strengthening and finishing processing assisted arc additive manufacturing technology provides an effective solution to the above problems

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