Powder bed electron beam additive manufacturing device and method

The embodiment of the invention relates to a powder bed electron beam additive manufacturing device and method. Comprising a forming chamber, the forming chamber is internally provided with a cavity, and the upper portion of the forming chamber is provided with an electronic gun, a vacuum system and an inert gas system; the forming cylinder is detachably arranged below the forming chamber, and the forming cylinder communicates with the cavity in the forming chamber; the powder cylinder is detachably arranged below the forming chamber, and the powder cylinder is communicated with the cavity in the forming chamber; the scraper is movably arranged in the forming chamber in the horizontal direction, and the scraper is used for scraping the powder in the powder cylinder into the forming cylinder; and the transfer chamber is detachably connected with the end parts, far away from the forming chamber, of the forming cylinder and the powder cylinder. By means of the powder bed electron beam additive manufacturing devi