A powder preheating device for laser selective melting and powder feeding and its application

Abstract

The invention belongs to the field of advanced rapid manufacturing technology, and discloses a powder preheating device for laser selective melting and powder feeding, including a powder storage funnel, a vacuum pump, a protective gas storage tank, a power supply device and a central controller, the vacuum pump and the protective gas storage tank are respectively connected to the powder storage funnel through the first connecting pipe and the second connecting pipe; the bottom outlet of the powder storage funnel is provided with a third electromagnetic valve; the outer side of the powder storage funnel The wall is wrapped with a heat insulation layer; an induction coil is arranged around the outer wall of the powder storage funnel; a temperature sensor for detecting the temperature of the metal powder in the powder storage funnel and a temperature sensor for detecting the internal pressure of the powder storage funnel are arranged on the powder storage funnel. Pressure Sensor. The invention has simple structure and convenient operation, and can improve the utilization rate of the metal powder while realizing the preheating of the metal powder.

Description

technical field [0001] The invention belongs to the technical field of advanced rapid manufacturing, and more specifically relates to a powder preheating device for laser selective melting powder feeding and its application. Background technique [0002] Selective laser melting (SLM) technology is an advanced manufacturing technology integrating computer-aided design, numerical control technology and additive manufacturing. SLM uses high-energy laser to directly melt metal powder to form parts layer by layer, so it is especially suitable for processing parts with complex shapes, especially parts with complex inner cavity structures and individual requirements. [0003] However, in the SLM forming process, the metal powder material is instantly melted, cooled and solidified under the action of high-energy laser, and its cooling rate can reach 10 3 -10 5 K / s causes a large residual stress inside the part, which in turn causes pores, cracks and other defects, reducing the qua...

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a powder preheating device for laser selective melting powder feeding and its application. Using a powder storage funnel to transport metal powder can solve the problem of metal powder utilization in the prior art. At the same time, it can controlly heat the metal powder in the funnel, so that the metal powder is heated evenly, reduce the residual stress in the SLM formed part, and avoid deformation and warpage due to large residual stress during the forming process. and problems such as inability to process

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