Multi-ultrasonic-assisted method for enhancing the forming quality of cmt aluminum alloy additive manufacturing

Abstract

The invention provides a device and a method for the multi-ultrasound assisted enhancement of the forming quality of CMT (Cold Metal Transfer) aluminum alloy additional material manufacture. In an electric arc formation molten bath, ultrasonic coupling functions of three directions are imported, in addition, a substrate fixing device is adopted to fix a substrate through a hard seat rubber cushionblock. Through the combined action of high-frequency ultrasonic agitation of three directions and the tiny high-frequency vibration of the substrate, metal melt is accelerated to flow, a material crystallization process is intervened, tiny and even crystal particles are formed again, gas which is dissolved in the melt is accelerated to separate out, the porosity of the forming element of additional material manufacture is lowered, and the mechanical property of the forming element is improved. An area of which the surface is likely to plastic deformation is subjected to ultrasonic impact processing, wherein the area is just formed by accumulation. In a forming process, residual stress on an accumulation completion position is lowered in real time, in addition, the residual pressure stressis formed on the surface, the fatigue strength of the forming element is improved, and deformation in an additional material manufacture process can be effectively controlled. Finally, the high-quality forming of the target part of the CMT aluminum alloy additional material manufacture is realized.

Description

technical field [0001] The invention relates to the field of CMT aluminum alloy additive manufacturing, in particular to a method for multi-ultrasonic assisted enhancement of the forming quality of CMT aluminum alloy additive manufacturing. Background technique [0002] CMT (cold metal welding) additive manufacturing technology is a rapid prototyping technology that combines metal CMT welding technology with the principle of rapid prototyping discrete accumulation. The 3D CAD solid model of the target part is obtained through 3D solid scanning or direct modeling. It is an advanced manufacturing technology that performs layered slicing with a certain thickness along a certain coordinate direction, melts the metal wire with an arc as a heat source, accumulates and forms each thin layer according to a predetermined forming path, and finally forms a three-dimensional solid part through layer upon layer accumulation. CMT additive manufacturing technology can complete the high-eff...

AI Technical Summary

Problems solved by technology

At present, although CMT additive manufacturing aluminum alloy technology has made some achievements, there are still many problems in practical application.

Mainly in terms of technology, in the process of CMT additive manufacturing of large aluminum alloy structural parts, due to the large temperature gradient, the residual stress is large, and the deformation of the formed part is too large, so that the forming process cannot continue.

In addition, there are many microstructural defects in CMT additive manufacturing aluminum alloys, such as pores, uneven grain size, microcracks, etc., which are the reasons for the poor mechanical properties of formed parts.

In view of the above reasons, it has greatly affected the further industrial application of CMT aluminum alloy additive manufacturing

Images