Material increasing manufacturing system capable of stably controlling atmosphere of forming cavity for long time

Abstract

A material increasing manufacturing system capable of stably controlling the atmosphere of a forming cavity for a long time comprises the forming cavity, wherein the forming cavity is connected with a gas replacement system and a smoke dust purifying system; signal outputs of a water content detector and an oxygen content detector which are mounted in the forming cavity are connected with a signal input of a control system; a control output of the control system is respectively connected with control inputs of the smoke dust purifying system, the gas replacement system and the forming cavity; the side wall of the forming cavity is connected with more than one transition cabin; an outer door and an inner door are mounted on each transition cabin; each transition cabin communicates with the forming cavity through a balance tube; a solenoid valve is mounted on each balance tube; the outside of each transition cabin is connected with a vacuum system controlled independently; a triangular groove is formed in a surface, which is in contact with the wall of a forming cylinder, of the bottom plate connected with a piston rod of the forming cylinder; and an elastic sealing ring with a triangular cross section is arranged in the triangular groove. By the transition cabins, protective gas can be reused, forming preparation time is shortened, and the manufacturing efficiency is improved; and by the elastic sealing ring with the triangular cross section, the airtightness is improved, amplitude of fluctuation of water content and oxygen content is reduced, and the forming quality is improved.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of additive manufacturing, and in particular relates to an additive manufacturing system capable of stably controlling the atmosphere of a molding cavity for a long time. [0003] Background technique: [0004] The metal 3D printing molding process requires the introduction of inert gases such as argon and nitrogen to reduce the oxidation phenomenon of the metal powder melting process. However, the atmosphere control system of the molding chamber of most existing 3D printing equipment generally has the following problems: ①The parts are formed , Open the molding chamber door to pick up the parts, the protective atmosphere is destroyed and cannot be reused, so the gas needs to be replaced once for each molding and the replacement time is long, which increases the molding preparation time of the parts and reduces the production efficiency; ②The bottom plate and A dynamic seal is formed between the cylin...

AI Technical Summary

Problems solved by technology

[0004] The metal 3D printing molding process requires the introduction of inert gases such as argon and nitrogen to reduce the oxidation phenomenon of the metal powder melting process. However, the atmosphere control system of the molding chamber of most existing 3D printing equipment generally has the following problems: ①The parts are formed , Open the molding chamber door to pick up the parts, the protective atmosphere is destroyed and cannot be reused, so the gas needs to be replaced once for each molding and the replacement time is long, which increases the molding preparation time of the parts and reduces the production efficiency; ②The bottom plate and A dynamic seal is formed between the cylinders, and the traditional sealing structure is not easy to ensure its sealing performance after a period of use; ③The atmosphere in the forming cavity is affected by the movement of the cylinder and the gasification of materials during the forming process, resulting in oxygen in the atmosphere of the forming cavity The content fluctuates greatly, especially in the process of printing parts for a long time, which is very easy to produce manufacturing defects; in addition, the smoke and dust generated by the melting of metal powder during the molding process can easily lead to a decline in molding quality, which requires effective purification

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