Electron gun for wire-fed electron beam additive manufacturing equipment

Abstract

The invention discloses an electronic gun for filament feeding type electron beam additive manufacturing equipment. The electronic gun mainly comprises a high-voltage cable, a high-voltage cable outgoing terminal, an electronic gun casing, an insulation component, a beam-forming electrode, a cathode and beam-forming electrode component, an anode, a filament head-end electrode, a filament tail-end electrode and a filament transformer, wherein the filament transformer is soaked in insulation cooling oil in an upper cavity and comprises a core, a primary winding and a secondary winding; the core is wound with the primary winding, and two ends of the primary winding are led out of the electronic gun casing simultaneously through outgoing plugs and connected to a filament power supply; the core is also wound with the secondary winding, one end of the secondary winding is connected with the filament head-end electrode, and the other end is connected with the filament tail-end electrode. A voltage stabilizing element is connected between the beam-forming electrode and the filament head-end electrode. Flexible movement of the electronic gun and prolonging of the service life of a filament are facilitated, and electron beams during discharge of the electronic gun can be inhibited effectively.

Description

technical field [0001] The invention relates to the technical field of electron beam processing equipment, in particular to an electron gun for wire-feeding electron beam additive manufacturing equipment. Background technique [0002] Wire-feeding electron beam additive manufacturing equipment uses a built-in electron gun, that is, the electron gun and the workpiece to be manufactured are in the same vacuum box, so that the effective utilization rate of the vacuum box is higher than that of an external electron gun. The multiple electrodes of the electron gun work at the high potential end, so the high-voltage cable connecting the high-voltage fuel tank and the electron gun is a single-strand multi-core high-voltage cable or a multi-strand single-core high-voltage cable structure, in which the filament current is as high as 20-50A, which is much larger than the electron beam current value. Therefore, the general high-voltage cables are thick and hard, and have a large bendin...

AI Technical Summary

Problems solved by technology

The life of the filament is directly related to its working current. Generally, the filament of a three-electrode electron gun works in a saturated state, which is not good for the life of the filament.

In addition, when the electron gun discharges, the grid bias voltage of the focusing electrode disappears, and the filament working in a saturated state will emit excessive thermal electrons, which will cause greater damage to the workpiece

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