Method for producing a three-dimensional component

Abstract

The invention relates to a method for producing a three-dimensional component by an electron-beam, laser-sintering or laser-melting process, in which the component is created by successively solidifying predetermined portions of individual layers of building material that can be solidified by being exposed to the effect of an electron-beam or laser-beam source (2) by melting on the building material, wherein thermographic data records are recorded during the production of the layers, respectively characterizing a temperature profile of at least certain portions of the respective layer, and the irradiation of the layers takes place by means of an electron beam or laser beam (3), which is controlled on the basis of the recorded thermographic data records in such a way that a largely homogeneous temperature profile is produced, wherein, to irradiate an upper layer, a focal point (4) of the electron beam or laser beam (3) is guided along a scanning path (17), which is chosen on the basis of the data record characterizing the temperature profile of at least certain portions of the layer lying directly thereunder or on the basis of the data records characterizing the temperature profiles of at least certain portions of the layers lying thereunder.

Description

technical field [0001] The present invention relates to a method of producing three-dimensional parts by means of electron beam, laser sintering or lasermelting methods, wherein said parts are produced by successively solidifying predetermined portions of layers of a building material, said building The material is curable under the action of electron or laser radiation by means of fusion of said building materials, this method having the other features stated in the preamble of claim 1 . [0002] Furthermore, the invention relates to an apparatus for selective laser powder processing, realized to carry out a method for producing three-dimensional components. Background technique [0003] The prior art has disclosed methods commonly referred to as laser sintering or laser melting methods. In such a method, a layer of building material is applied which is locally heated under the action of radiation, in particular electron or laser radiation, in order to cure at points corre...

AI Technical Summary

Problems solved by technology

[0005] Although such electron beam melting or sintering methods or laser melting or laser sintering methods have been found to be efficient means of producing components, it has also been found that during the production of the object large temperature gradients are created in the layers to be solidified, which is disadvantageous of

Such high temperature gradients can lead to cracks in the produced material, often adversely affecting the quality of the produced objects

In addition, local overheating may occur, causing the localized fused bed created by the laser beam to take on a larger scale than originally thought

This can adversely affect the precision of the production method or result in material unevenness, such as burrs, which need to be removed at great cost after the object has been produced

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