New method used for realizing powder melting and forming based on laser scanning

Abstract

The invention relates to a new method used for realizing powder melting and forming based on laser scanning, aiming at solving the technical problems that the efficiency is low by adopting single beamof laser for melting and forming, parts are easy to be deformed and cracked after forming, and the thermal stress is difficult to be controlled. A technical scheme is adopted as follows: two types oflasers and matched vibration mirror systems are adopted; according to a contour pattern of a cross-section of a slice, each layer of solid powder is subjected to area scanning synchronously; and scanning is carried out layer by layer by the two types of lasers in each area so as to finish the powder melting and forming, wherein an area dividing method comprises the steps of respectively scanningand dividing parallelly a cross-section image by scanning lines in millimetre and micrometer so as to form a rectangular fast scanning area in millimetre and a curve edge fine scanning area in micrometer and lead the envelope curve pattern of the curve edge fine scanning area in micrometer to be approximate to the contour pattern infinitely. The method has the advantages that two lasers are adopted for compound scanning; the time is saved; the part forming efficiency is improved; and the part is not easy to be buckled and deformed and cracked.

Description

technical field [0001] The invention relates to the technical field of laser melting molding, and relates to a new method for realizing powder melting molding based on laser scanning, in particular to a method for scanning and molding in subregions by using two kinds of lasers. Background technique [0002] Laser rapid prototyping manufacturing technology is a high-tech laser prototyping developed in the 1980s. Among them, the selective laser forming technology uses solid powder as the sintering molding material. The CAD three-dimensional model of the part is input into the computer, and then the section information file is generated through slicing. The computer controls the laser forming layer by layer. Prototype or parts needed. This technology has the characteristics of wide range of molding materials, the manufacturing process is not affected by the complexity of parts, high manufacturing efficiency and low cost, and is especially suitable for manufacturing complex str...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of low efficiency of single-beam laser melting molding in the world, easy deformation and cracks of parts after molding, and difficult control of thermal stress, this invention designs a new method based on laser scanning to realize powder melting molding. One kind of laser and two sets of vibrating mirror systems are used for compound scanning melting and forming, the laser scanning is uniform, and the deformation is not easy to occur

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