Large part 3D printing method

Abstract

The invention discloses a large part 3D printing method comprising the steps that the diameter of a used wire is 0.5 mm-5 mm, and tracks of a workbench and an electric-arc welding gun are controlled by a computer program to which morphological control is input; the state of the printing process is fed back to a computer responsible for morphological control through an optical camera, and the computer adjusts the tracks of the workbench and the electric-arc welding gun through the feedback result; according to different metal materials, after printed height is 2-6 mm, electric-arc wire feedingprinting is stopped, and induction heating and ultrasonic high-frequency micro-forging treatment are conducted on the whole layer of printing plane. The large part 3D printing method has the beneficial effects that stress deformation of a part during 3D printing is removed in time, not much extra dimension allowance needs to be added, waste of materials and labor hours is avoided, production costis reduced, production efficiency is improved, stress relief annealing is not needed later, and thus super-huge parts can be printed.

Description

technical field [0001] The invention relates to the field of metal material processing, in particular to a method for 3D printing of large parts. Background technique [0002] The 3D printing process is based on the discrete-accumulation principle, driven by the three-dimensional data of the part, and adopts the method of accumulating materials layer by layer to manufacture the rapid prototyping technology of the solid part. This forming method is a highly integrated product digital design, manufacturing, and analysis, which can not only significantly shorten the research and development cycle and research and development costs, but also the more complex the structure and the higher the added value of raw materials, the more significant the advantages of rapid and efficient forming. 3D printing technology is currently used in mold manufacturing, industrial design, automobile, aerospace and medical industry, civil engineering, military and other fields, and will gradually rep...

AI Technical Summary

Problems solved by technology

[0008] (1) During 3D printing, the stress and deformation of the parts are large, and it is necessary to increase the extra margin size, resulting in a certain waste of materials and man-hours, increasing production costs, reducing production efficiency, and subsequent stress relief annealing is required. Large parts are limited by the size of the annealing furnace;

[0009] (2) For materials with different thermal conductivity, the printing effect of the parts has certain defects. The TC4 titanium alloy with low thermal conductivity is printed with a basket structure and a small amount of Widmanstatten burnt structure, copper alloy and aluminum alloy. When printing materials with high thermal conductivity, there are more micro-crack defects, and the forming effect is not ideal;

[0010] (3) Parts often have poor fusion after printing, and there are micro-cracks or pores inside. After non-destructive testing, there are many defects, which cannot meet the acceptance requirements;

[0011] (4) After the parts are annealed, the grains are coarse, and the diameter generally exceeds 100 microns, which is much larger than the grains of parts processed by traditional processes, and the mechanical properties and fatigue resistance are low.

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