Multifunctional SLM device

Abstract

The invention discloses a multifunctional SLM device, and belongs to the technical field of laser 3D printing. The multifunctional SLM device is composed of four parts including a preheating module, avacuumizing module, a gas circulating and filtering module and a programmable logic controller (PLC).According to the multifunctional SLM device, firstly, a forming chamber is repeatedly vacuumized,and inert gas is introduced, so that the oxygen content is quickly reduced within a limit range; two modes of induction heating and infrared heating are combined, so that the heating speed is high, the material application range is wide, the heating time can be greatly shortened, the workpiece quality is obviously improved, and the temperature gradient of a forming piece is reduced; and after heating is completed, the inert gas is continuously introduced, and a secondary circulating and filtering structure is adopted, so that impurity particles in the gas are effectively filtered, the secondary service efficiency of the gas is obviously improved, and the economic cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of laser 3D printing, and in particular relates to a multifunctional SLM device. Background technique [0002] Selective Laser Melting (SLM), as one of the rapid prototyping technologies, uses the laser beam as the heat source to selectively heat and melt the single-layer powder, which is the bonding of the powder particles in the single layer and between the layers. knots, and finally can quickly form three-dimensional solids of complex shapes. During the forming process of the workpiece, due to the low temperature of the bottom plate of the workbench and the high temperature generated by laser melting single-layer powder, as the forming height increases, a large temperature gradient is gradually formed, causing thermal stress, which in turn leads to cracks inside the workpiece , affecting the mechanical properties. [0003] By adding a preheating module in the process, the crack phenomenon can be effecti...

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Problems solved by technology

In industrial applications, it is found that the preheating temperature of this method is difficult to exceed 200°C. If the power of the heating rod is increased, it is easy to burn out or even short circuit.

When heating to a higher temperature, the heating rate is limited, increasing the time cost of production

At the same time, for a higher preheating temperature, the surrounding materials in the forming chamber are easy to react with the oxygen in the air, resulting in oxidation, which is not conducive to the maintenance of the forming chamber

By continuously injecting inert gas into the molding chamber and forcing convection circulation, the oxygen content of the air in the molding chamber is continuously diluted and reduced, so that the oxygen content in the molding chamber is reduced to below 100ppm (0.01%), but this method takes a long time and wastes inert gas. Poor economic benefit, increase production cost

At the same time, during the laser forming process, the dust aroused by the laser is carried out by the inert gas, and the gas containing particle impurities cannot be reused, which is not conducive to the consideration of economic cost

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