Multi-metal part additive manufacturing device and method combining femtoseconds and traditional laser

Abstract

The invention provides a multi-metal part additive manufacturing device and method combining femtoseconds and traditional laser. The device comprises an additive manufacturing device body, a femtosecond laser output mechanism, a fine powder feeding mechanism and a fine powder absorption mechanism. The additive manufacturing device body comprises a printing cavity, a workbench, an ascending-and-descending device, a metal base plate, a traditional laser output mechanism and a PLC. The workbench is arranged in the printing cavity and provided with a printing groove. The metal base plate is fixedinto the printing groove in an ascendable and descendable manner through the ascending-and-descending device. The PLC is connected with the ascending-and-descending device, the traditional laser output mechanism, the femtosecond laser output mechanism, the fine powder feeding mechanism and the fine powder absorption mechanism. By means of the multi-metal part additive manufacturing device and method combining the femtoseconds and the traditional laser, printing of multi-metal complex parts can be achieved fast; and a junctional zone of two metals small in stress can be effectively sintered, and the junctional zone is prevented from cracking.

Description

Technical field [0001] The invention relates to the technical field of preparation of new metal parts, in particular to a multi-metal parts additive manufacturing device and method combining femtosecond and traditional laser. Background technique [0002] Selective Laser Melting (SLM) technology is a high-precision metal additive manufacturing method, which is based on the basic idea of ​​additive manufacturing, that is, layered manufacturing, layer-by-layer stacking manufacturing method, and printed samples Smooth surface and fine structure. [0003] Femtosecond laser means that the pulse width is 1-1000fs (1fs=10 -15 s) the laser. Compared with other laser sources, femtosecond lasers have extremely short pulse duration and extremely high peak power, extremely short action time, and a small heat-affected zone formed. Femtosecond lasers can avoid cracking of the multi-metal connection interface due to its high energy input, high resolution, and small heat-affected zone. [0004] H...

AI Technical Summary

Problems solved by technology

[0004] However, traditional SLM technology can only shape one material at a time, making it difficult to print parts composed of multiple materials

The existing SLM technology generally cannot use different metals on a certain section, and cannot accurately transport the powder to another metal area; at the same time, the interface performance of the two metal joints may be poor, and the bimetal composite interface bonding effect Poor, prone to layering; and has issues with limited print speeds

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