Metal surface exposure type powder bed melting additive manufacturing system

Abstract

The invention relates to a metal surface exposure type powder bed melting additive manufacturing system. The metal surface exposure type powder bed melting additive manufacturing system comprises a laser light source module, a negative film module, a secondary amplification module, a light beam focusing adjustment module and a forming bar which are connected in sequence, wherein the laser light source module is used for generating laser, and the negative film module is used for cutting the laser to realize high-precision and low-power negative film image acquisition; the secondary amplification module is used for carrying out secondary amplification on acquired negative film light and outputting a high-power pulse; the light beam focusing adjustment module is used for focusing and shaping an input laser beam; and the forming bar is used for forming a required manufacturing shape. Compared with the prior art, the metal surface exposure type powder bed melting additive manufacturing system has the advantages of conveniently realizing selected area surface exposure, improving the printing rate of SLM and the like.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a metal surface exposure type powder bed fusion additive manufacturing system. Background technique [0002] Powder bed fusion additive manufacturing (including SLS and SLM) is a series of important additive manufacturing or 3D printing technologies. It mainly fuses powders together by high power laser. [0003] The technological advantages of powder bed fusion additive manufacturing are: 1) When processing standard metals, the density exceeds 99%, and the good mechanical properties are comparable to traditional processes. 2) The types of machinable materials continue to increase, and the processed parts can be welded later. 3) The accuracy and surface quality are relatively high, which can be used directly or only need relatively simple post-processing. Therefore, in terms of product quality, powder bed fusion additive manufacturing, especially SLM, is most lik...

AI Technical Summary

Problems solved by technology

However, the disadvantages of the powder bed fusion additive manufacturing process are: 1) the raw material is expensive, 2) the speed is low

This has created a serious bottleneck for technology rollout in these industries

[0004] The problem of expensive raw materials can be overcome by developing materials with new properties, but limited by the power of the laser system and the level of collaborative control technology, currently the only way to increase the rate is through multiple lasers

Taking the typical SLM technology as an example, according to reports and industry exhibitions, the most coordinated laser beams currently stop at 12 lasers, and it is still in the research and development stage, and it is very difficult and costly. The problem of control coordination and fusion forming is complicated, and the debugging process is also extremely difficult

Even so, the printing efficiency of SLM technology is still far inferior to direct energy deposition additive manufacturing printing technology (DED technology) or emerging supersonic deposition additive manufacturing technology (SD technology), but the accuracy of DED technology and SD technology is poor, Post-processing of precision machine tools is necessary; the printing efficiency of the same SLM technology is not as good as the 3DP technology with lower density and limited performance

The printing efficiency of SLM technology is far from the production efficiency of traditional production technology.

Images