Non-mean-value double-light-beam synchronous scanning laser selective melting device and light path synthesis method thereof

Abstract

The invention discloses a non-mean-value double-light-beam synchronous scanning laser selective melting device and a light path synthesis method thereof. The device comprises a large light spot laser beam incidence device body, a small light spot laser beam incidence device body, a laser beam light composition assembly, an X-Y vibration mirror scanning device body and a field mirror, wherein the laser beam light composition assembly is composed of a large light spot reflecting mirror and a small light spot reflecting mirror, and the X-Y vibration mirror scanning device body is composed of an X-axis-direction vibration mirror and a Y-axis-direction vibration mirror. According to the non-mean-value double-light-beam synchronous scanning laser selective melting device and the light path synthesis method thereof, the light composition assembly is additionally arranged in a traditional light path system so that synthesis of two laser beams with different light spot sizes and the process of synchronous scanning can be conveniently and quickly achieved. Through synthesis of the laser beams with different light spots, an annular heat source with the temperature gradient can be generated on a forming plane, metal power firstly passes through a low-temperature preheating area before being heated to be melted, solidified solid metal goes through a transient low-temperature tempering process, and thus the heat stress influence generated in the laser scanning process is effectively lowered.

Description

technical field [0001] The invention relates to the process of applying laser selective melting to form metal parts, in particular to a non-average dual-beam synchronous scanning laser selective melting device and an optical path synthesis method thereof. Background technique [0002] Laser selective melting technology is already a widely used and mature metal additive manufacturing technology. This technology uses laser as the heat source, focuses the laser beam on the metal powder on the forming plane through the control of the precise optical scanning system, and moves the laser focus at high speed according to the predetermined path, so that the scanned metal powder on the forming plane melts rapidly Afterwards, it is rapidly cooled and solidified, and the three-dimensional solid metal structure is finally processed by scanning the cross-sectional area layer by layer and superimposing the molding method layer by layer. [0003] In principle, the laser selective melting ...

AI Technical Summary

Problems solved by technology

The metal powder in the low temperature state is instantly heated to several thousand degrees Celsius and then rapidly cooled below the melting point. This process will generate uncontrollable thermal stress concentration inside the formed metal part, which will cause the formed part to bulge, Warping and other phenomena will reduce the molding quality and even lead to processing failure

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