Preheat device and preheat method of selective laser selection area melting subscriber loop multiplex (SLM) equipment powder feeding barrel

Abstract

Provided are a preheat device and a preheat method of selective laser selection area melting subscriber loop multiplex (SLM) equipment powder feeding barrel. A metal sensing coil around a barrel body of a powder carrying barrel is arranged through the arrangement of the powder carrying barrel, a high-frequency or an intermediate-frequency power supply is electrically connected with the metal sensing coil, and a central controller is electrically connected with the high-frequency or the intermediate-frequency power supply. Besides, the central controller is further connected with a temperature sensor in a communicating mode, a temperature sensing component of the temperature sensor is used for collecting temperature information of metal powder in the powder carrying barrel, a metal powder scratch board is arranged in a preset position which is arranged on the outer portion of the powder carrying barrel, and the central controller is connected with the metal powder scratch board in a controlled mode. Due to the combination with the preheat method, the preheat device of selective laser selection area melting SLM equipment powder feeding barrel avoids residual stress which is produced by an uneven temperature field caused by laser rapid formation local heat input, and therefore pretreatment can not cause cracking of a forming piece.

Description

technical field [0001] The invention relates to the technical field of rapid prototyping, in particular to a preheating device and a preheating method for a powder feeding cylinder of selective laser selective melting SLM equipment. Background technique [0002] Selective laser melting SLM is a method of direct forming of metal parts and is the latest development of rapid prototyping technology. This technology is based on the most basic idea of ​​rapid prototyping, that is, the "incremental" manufacturing method of layer-by-layer cladding, and directly forms parts with specific geometric shapes according to the three-dimensional CAD model. During the forming process, the metal powder is completely melted to produce metallurgical bonding. Metal parts with complex shapes and structures that cannot be manufactured by traditional machining methods are one of the main directions for the application of laser rapid prototyping technology. Has the following advantages: [0003] (...

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