Powder bed electron beam additive manufacturing equipment and method

Abstract

The invention discloses powder bed electron beam additive manufacturing equipment and method, and the equipment comprises a forming chamber with a preset low vacuum degree inside; the powder spreading platform is arranged in the forming chamber, a scraper is arranged above the powder spreading platform, and a forming cylinder, a first powder cylinder and a second powder cylinder are arranged below the powder spreading platform; the two powder filtering devices are respectively arranged on two side walls of the forming chamber; one end of the powder filtering device is fixed to the two side walls of the forming chamber, and the other end of the powder filtering device is located in the forming chamber and stretches into or out of the first powder cylinder or the second powder cylinder in a horizontal movement mode. According to the invention, redundant metal powder falling into the first powder cylinder or the second powder cylinder after printing of each layer is finished can be filtered, so that the filtered metal powder can be reused in a single printing process, the reuse rate of the metal powder is greatly improved, and the problem of metal powder pollution in the printing process is also effectively solved.

Description

technical field [0001] The invention relates to the technical field of powder bed additive manufacturing equipment, in particular to a powder bed electron beam additive manufacturing equipment and method. Background technique [0002] Powder bed electron beam additive manufacturing equipment is currently one of the mainstream equipment in the field of 3D metal printing. It can print refractory metals and alloys with high melting points such as titanium, tungsten, molybdenum, tantalum, and niobium into metal parts. It mainly uses electronic Beam selective melting forming technology. [0003] In the electron beam selective melting forming technology, the powder bed electron beam additive manufacturing equipment usually adopts the method of one-way powder spreading by a scraper for powder feeding. However, the one-way powder spreading method of the scraper has low metal powder utilization efficiency. During the powder spreading process, a small part of the powder is used for t...

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Problems solved by technology

[0005] The embodiment of the present invention provides a powder bed electron beam additive manufacturing equipment and method to solve the problem that most of the metal powder will fall on the powder when the powder bed electron beam additive manufacturing equipment in the prior art uses a scraper to spread powder in one direction. Formation of powder residue and sintered agglomerates in the cylinder and pre-sintering, resulting in low recycling rate of metal powder in a single printing process

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