Selective melting powder real-time preheating system and method based on multiple laser devices

Abstract

The invention belongs to the related technical field of metal part quick molding manufacturing, and discloses a selective melting powder real-time preheating system and method based on multiple laserdevices. The preheating system comprises a laser preheating unit, a temperature measuring unit, a laser processing unit and a control unit; and in the laser selective melting processing process, the laser preheating unit with equal-energy distribution laser beams is adopted for achieving real-time, quick, even and selective preheating on to-be-processed powder on the powder tool surface, an instrument of the temperature measurement unit is used for conducting real-time monitoring and feedback of the temperature of the powder preheated by the laser beams, coincidence of the temperature of the preheated powder and the set preheating temperature is guaranteed, the problem that the preheating effect is gradually decreased along with continuous reduction of the preheating temperature along withthe increase of the laser selective region molding height is effectively avoided, the interference effect between the heating device and the processing system and non-uniform powder preheating are avoided, the powder preheating accuracy is effectively improved, and energy waste of the preheating system is reduced.

Description

technical field [0001] The invention belongs to the technical field of rapid prototyping and manufacturing of metal parts, and more specifically relates to a real-time preheating system and method for selective melting powder based on multiple lasers. Background technique [0002] Selective laser melting (SLM) technology is a new rapid prototyping technology that emerged in the 1990s. It combines CAD / CAM, numerical control, optics and material science and other technologies, uses various metal powders as processing raw materials, and uses high-energy lasers to rapidly melt the powder point by point, field by field, and layer by layer according to the 3D CAD model and rapidly cool it. Form a part with a specific geometry. The density of its formed parts is nearly 100%, and its mechanical properties are equivalent to those of forged parts. Moreover, SLM technology has the characteristics of simple process, wide range of forming materials (pure metal powder, composite powder),...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a multi-laser based selective melting powder real-time preheating system and method, wherein during the laser selective melting process, laser beams with equal energy distribution are used The preheating unit realizes real-time, rapid, uniform and selective preheating of the powder to be processed on the surface of the powder bed, and real-time monitoring and feedback of the temperature of the powder preheated by the laser beam through the temperature measuring unit, thereby ensuring that the preheating The powder temperature is consistent with the set preheating temperature, which effectively avoids the problem that the preheating effect will continue to decrease with the increase of the laser forming height, and also avoids the interference effect between the heating device and the processing system and the uneven powder preheating problems, thus effectively improving the powder preheating accuracy and reducing the energy waste of the preheating system

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