Additive manufacturing of three-dimensional articles

An article, three-dimensional technology, applied in processing and manufacturing, manufacturing tools, additive manufacturing, etc., can solve problems such as destroying cathode components, and achieve the effect of improving reliability
CN110301026AActive Publication Date: 2019-10-01ALCAM
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
ALCAM
Publication Date
2019-10-01

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Abstract

A method is provided for forming a three-dimensional article through successively depositing individual layers of powder material that are fused together so as to form the article. The method includes: providing at least one electron beam source emitting an electron beam; providing a leakage current detector for sensing a current through the anode and / or the Wehnelt cup; providing a low impedancevoltage source connectable to the Wehnelt cup via a switch, where the voltage source is having a more negative potential than a negative potential applied to the cathode; and protecting the cathode against vacuum arc discharge energy currents when forming the three-dimensional article by providing the Wehnelt cup to the low impedance negative voltage by closing the switch when the leakage currentdetector is sensing a current through the anode and / or the Wehnelt cup which is higher than a predetermined value.
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Description

technical field

[0001] The invention relates to a method for the additive manufacturing of three-dimensional objects by successively melting individual layers of powder material. Background technique

[0002] Free-form manufacturing, or additive manufacturing, is a method of forming three-dimensional objects by continuously melting selected portions of a powder layer applied to a workbench.

[0003] Additive manufacturing equipment may include: a table on which a three-dimensional object is to be formed; a powder dispenser or powder dispenser arranged to lay down a thin layer of powder on the table to form a powder bed; a high energy beam for injecting The powder transfers energy, whereby melting of the powder occurs; elements for controlling the energy released by the energy beam on the powder bed for forming cross-sections of three-dimensional objects through partial melting of the powder bed; and the control computer, which stores relevant Continuous cross-section inform...

Claims

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