Selective laser melting (SLM) vacuum protection device

Abstract

The invention belongs to the technical field of rapid molding, and relates to a selective laser melting (SLM) vacuum protection device. An SLM molding operating mechanism is arranged in a sealed cabin; the sealed cabin is communicated with a vacuum pump set consisting of a roots pump and a mechanical pump; a pipeline valve is arranged on an adaptive pipeline; a vacuum electromagnetic valve is arranged at the upper end of the mechanical pump; an inert gas valve is connected with a central control system; one side of the inert gas valve is connected with an air inlet electromagnetic valve, and the other side of the inert gas valve is connected with an integrated flange plate; the central control system is connected with an upper computer in an electrical information manner, and the upper computer is connected with an alarm indicating lamp in a control manner; a scanning array mirror system and a laser lens are arranged in the SLM molding operating mechanism; an oxygen content sensor, a pressure sensor and a temperature sensor are arranged at the bottom of the sealed cabin. The SLM vacuum protection device disclosed by the invention is simple in structure, reliable in principle, convenient in operation, high in degree of automation and wide in application, and can be used for processing different materials.

Description

Technical field: [0001] The invention belongs to the technical field of rapid prototyping, and relates to a selective laser melting (SLM) vacuum protection device, which is suitable for processing different powder materials. Background technique: [0002] Selective laser melting (SLM) is a method of direct forming of metal parts. It is the latest development of rapid prototyping technology. The CAD model is directly formed into a part with a specific geometry, and the technical powder is completely melted during the forming process, resulting in a metallurgical bond. Metal parts with complex shapes and structures that cannot be directly manufactured by traditional mechanical processing methods are one of the main directions for the application of laser rapid prototyping technology. Laser rapid prototyping technology has the following advantages: First, it can directly manufacture high-quality metal products without any Post-treatment process or simple surface treatment can ...

AI Technical Summary

Problems solved by technology

However, the existing selective laser melting (SLM) equipment is protected by protective atmosphere and normal pressure gas. This method is easy to increase the oxygen content of metal parts when forming titanium alloys, aluminum alloys and other metals, which will eventually affect the performance of parts. , and the molten pool formed by the metal powder under the action of the laser is prone to have tiny bubbles to form tiny defects, resulting in a decrease in the mechanical properties of the metal parts

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