ELECTRON BEAM MELTING FURNACE AND METHOD FOR OPERATING SAME

摘要

An electron beam is accurately emitted to a pre-set location on a molten metal pool formed in a hearth or a mold arranged in an electron beam melting furnace. The present invention provides a method for operating an electron beam melting furnace, the furnace includes: a hearth and a mold for holding molten metal, an electron gun for keeping the metal as a molten state, an electron beam controlling means for controlling direction of the electron beam, an image sensor for molten metal, and an operating means, and the method includes: a step of inputting coordinates in the electron beam controlling means at which an electron beam is to be emitted on molten metal, a step of emitting the electron beam on the molten metal, a step of detecting a high electron beam intensity spot generated by emitting an electron beam on the molten metal by the image sensor, a step of calculating coordinates of high electron beam intensity based on the detected signal by the operating means, a step of calculating differences between the coordinates of emission and the coordinates of high electron beam intensity spot, a step of inputting the difference in the electron beam controlling means, and a step of controlling the location of electron beam spot so that the difference be not more than pre-set value.

主权项

1. An electron beam melting furnace comprising:
a hearth and a mold for holding molten metal, an electron gun for emitting electron beam for keeping the metal as a molten state, an electron beam scanning pattern generation device for controlling a signal of a location of an electron beam spot from the electron gun, and an electron beam controlling means for controlling a direction of the electron beam according to the control signal input therein, wherein the electron beam melting furnace further comprising: an image sensor for detecting a high electron beam intensity spot formed by an electron beam on the surface of molten metal in the hearth or the mold, an operating device for calculating a location difference between the actual location of high electron beam intensity spot detected by the image sensor and a pre-set location to be emitted from the electron beam gun that is set at the beginning of the melting process, an emitting device for generating a signal for correcting above location difference calculated by the operating device, and a device for adding the correction signal to the control signal.