Device and method for manufacturing radial additive by friction stir welding

Abstract

The invention relates to a device and method for manufacturing a radial additive by friction stir welding. The device is a set of special-shaped stationary shaft shoulder body and comprises a stirringhead, a stationary shaft shoulder body and a mould, wherein the outer side of the stirring head is coaxially provided with the stationary shaft shoulder body in a sleeved mode, and the stationary shaft shoulder body is matched with the mould to be installed. The mould is used to pass through the radial additive for several times, and thus the required additive manufacturing parts are obtained. Inthe additive manufacturing process, auxiliary processes such as ultrasonic, auxiliary heating, etc. are added to ensure the performances of the additive manufacturing parts. In a semi-solid state, ultrasonic cavitation can refine grains to form ultrafine / nanocrystalline materials; and in a solid state, ultrasonic can promote the atomic diffusion ability and can also reduce the residual stress, which is conducive to obtaining an additive structure with high bearing capacity. Meanwhile, for the of metal-matrix composites, the addition of ultrasonic can also promote the violent mixing of materials to avoid the phenomenon of segregation in the process of additive manufacturing.

Description

technical field

[0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a device and method for friction stir welding radial additive manufacturing. Background technique

[0002] With the continuous development of engineering technology, traditional subtractive manufacturing methods such as turning, milling, planing, and grinding can no longer meet the needs of some projects. Therefore, additive manufacturing technology came into being. Additive manufacturing technology is a process of gradually accumulating materials under certain temperature and pressure conditions. It is a manufacturing technology from scratch. At present, most additive manufacturing technologies use methods such as material extrusion, sintering, melting, light curing, and spraying to accumulate layer by layer. However, in the process of melting and solidifying the material first, defects such as pores are prone to occur on the surface or inside of the...

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