Selective laser melting (SLM) atmosphere protection system

Abstract

The invention relates to a selective laser melting (SLM) atmosphere protection system comprising a metal sealed cabin body of which the inside is provided with a selective laser melting (SLM) forming operation mechanism, wherein the inside of the metal sealed cabin body is also provided with a temperature-controlled air conditioner, the temperature-controlled air conditioner is connected with a central control system outside the metal sealed cabin in a controlling way, the central control system is connected with an upper computer with a human-computer interface in a communicating way, an inert gas container in which inert gas exists is communicated with the metal sealed cabin body by an inert gas pipeline, an air-inlet electromagnetic valve connected with the central control system in a controlling way is arranged on the inert gas pipeline, an oxygen purifier is provided with two pipelines communicated with the metal sealed cabin body, a first valve is arranged on one pipeline, and a second valve, a circulating fan and a molecular sieve on the part of the other pipeline, which extends into the metal sealed cabin body, are arranged on the other pipeline. The addition of the technological parameter of the oxygen content with strict control in the forming process is avoided, and the influence of the oxygen content, which is caused to the performance of components, is prevented; and moreover, the inert gas can not be excessively consumed, and the production cost is lowered.

Description

technical field [0001] The invention relates to the technical field of rapid prototyping, in particular to a selective laser melting SLM atmosphere protection system. 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] (1) It can be directly made into terminal metal products without an...

AI Technical Summary

Problems solved by technology

[0008] However, at this stage, all selective laser melting SLM equipment is protected by flowing gas. This method is easy to increase the oxygen content of the forming object when forming titanium alloys, aluminum alloys and other metals, which will eventually affect the performance of parts.

And this method has been constantly consuming inert gas, greatly increasing production costs

Images