A laser 3D printing molding equipment that effectively prevents cracking of metal alloy components

Abstract

The invention discloses a laser 3D printing molding device that can effectively prevent cracking of metal alloy components, belongs to the technical field of metal powder laser melting molding, and includes a control system, a laser scanning system, and a molding system. chamber, annealing chamber, and powder spreading mechanism, and the molding chamber, annealing chamber, and powder spreading mechanism are fixed to each other and the bottom surface is in contact with the forming platform. The molding system also includes driving the molding chamber, annealing chamber, and powder spreading mechanism along the horizontal The sliding drive mechanism that moves in the same direction, the laser scanning system is located at the top of the molding chamber, the annealing chamber is equipped with a welding torch and a welding displacement mechanism that drives the welding torch to move along the horizontal plane, and both the sliding drive mechanism and the welding displacement mechanism are connected to the control system. By adding synchronous annealing treatment in the forming process of layer-by-layer accumulation, the present invention can effectively eliminate the problem of easy cracking caused by large temperature gradients in various parts during the long-term additive manufacturing process.

Description

technical field [0001] The invention relates to the technical field of metal powder laser melting molding, in particular to a laser 3D printing molding equipment capable of effectively preventing component cracking. Background technique [0002] Rapid Prototyping (RP) technology is an advanced manufacturing technology developed rapidly in the 1990s, and it is a key technology serving the development of new products in the manufacturing industry. It plays a positive role in promoting product innovation of enterprises, shortening the cycle of new product development, and improving product competitiveness. Since the technology came out, it has gradually been widely used in the manufacturing industry of various countries in the world, and thus gave birth to a new technical field - 3D printing technology, as a new rapid prototyping technology, mainly used in product prototypes , mold manufacturing, artistic creation, jewelry making and other fields, used to replace some traditio...

AI Technical Summary

Problems solved by technology

[0004] During the long-term circulation of high-power laser beams based on SLM technology, the laser melting and forming manufacturing process of "point-by-point scanning melting-line-by-line scanning lapping-layer-by-layer solidification and accumulation" fluctuates in main process parameters, external environment, and melt state of the molten pool Discontinuity and instability, such as changes in the sum and changes of scanning and filling trajectories, may produce various special internal metallurgical problems in local areas such as between deposit layers and deposit layers, between deposit channels and deposit channels, and inside a single deposit layer. Defects (such as local lack of fusion between layers and channels, air gaps, entanglement and precipitation pores, fine ceramic inclusions, internal special cracks, etc.) and affect the internal quality, mechanical properties and service use of the final formed parts Safety

Therefore, the thermal stress and residual stress caused by the high heating and cooling rate in the 3D printing process will cause serious deformation, warping and cracking of the printed metal components, and the cracking and deformation of the accumulation layer have always been difficult problems. Severely reduces the excellent mechanical properties of metal alloys. Although SLM technology maintains a certain degree of stress balance through the support structure, it is not enough to completely improve the problems of deformation, warpage and cracking

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