Preheating and insulation device for laser selective melting forming

Abstract

The invention discloses a preheating and insulation device for laser selective melting forming. Compared with existing laser selective melting equipment, the working environment of the preheating andinsulation device is the vacuum environment with the pressure being 10-1 Pa or above, convection in the vacuum environment is weak, heat is not liable to be dissipated, the preheating and insulation effects can be greatly improved, due to the good heat insulation performance, equipment sensitive elements are not damaged due to obvious temperature increase even though the preheating temperature ishigh, and the preheating temperature of the laser selective melting equipment can be greatly increased; a single laser is used as a light source, conversion of preheating scanning and forming scanningis achieved through moving of a focus lens, and the better economical efficiency is achieved compared with the mode that two lasers are used (one of the two lasers is used for preheating scanning, and the other laser is used for forming scanning); and compared with electron beam selective melting equipment, the laser selective melting equipment is especially suitable for forming magnetic or non-conducting materials, finer powder can be used, the part forming precision is higher, and the market prospects are broad.

Description

technical field [0001] The invention belongs to the field of laser material processing, and more specifically, the invention relates to a preheating and heat preservation device for laser selective melting and forming. Background technique [0002] Laser selective melting technology is to discretize the 3D model of the part into a series of micron-scale thin layers along a certain direction, use the laser as the heat source, and scan and selectively melt the pre-laid metal powder bed layer by layer according to the pre-designed processing path of each layer. Thus, net-shape parts of arbitrary complex shapes can be directly produced. Formed parts can be put into use without CNC machining, and only need heat treatment and surface finishing treatment. Laser selective melting technology is especially suitable for the rapid manufacture of complex thin-walled structures, spatially curved porous structures, closed multi-channel structures, etc., and has broad applications in the d...

AI Technical Summary

Problems solved by technology

Due to the restriction of preheating temperature, the existing laser selective melting equipment is mainly aimed at materials with good formability such as TC4 titanium alloy, 316 stainless steel, AlSi10Mg alloy, In718 superalloy, MS1 die steel, etc. For ultra-high strength steel, intermetallic compounds, Brittle materials such as ceramics are easy to crack during the forming process, and it is difficult to meet the forming requirements. Increasing the preheating temperature is an important technical means to inhibit the cracking of the above materials during the forming process.

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