In situ real-time measurement device used in powder bed melting additive manufacturing process

Abstract

The invention discloses an in situ real-time measurement device used in a powder bed melting additive manufacturing process. A thermocouple of the device is arranged at a position, where temperature needs to be measured, on a substrate, and a displacement sensor is in contact with the lower surface of the substrate, so that the displacement sensor can measure deformation of the substrate in the additive manufacturing process. The device disclosed by the invention can realize in situ real-time monitoring on thermal-deformation (or temperature) of the substrate and a formed part in the powder bed melting additive manufacturing process, can accurately reflect evolution rules of the thermal-deformation (or temperature) of the substrate along with time, not only provides a reliable experimentalmeasurement basis for studying a deformation mechanism of the substrate and the formed part in the powder bed melting additive manufacturing process, but also provides powerful experimental data forfinite element simulation on powder bed melting additive manufacturing and finally lays a foundation for establishing a technique of effectively controlling deformation of the substrate and the formedpart as well as obtaining a high-precision and high-performance formed part.

Description

【Technical field】 [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to an in-situ real-time measurement device in the powder bed fusion additive manufacturing process. 【Background technique】 [0002] Powder bed fusion additive manufacturing technology, its principle is: use the computer 3D design software to generate the 3D CAD model of the part and slice and layer, obtain a series of 2D cross-sectional information, and then set the heat source scanning strategy and process parameters according to the cross-sectional shape data . The scraper spreads a thin layer (thickness of about 30um) of powder on the substrate, and then the computer controls the heat source to selectively melt the layer of powder according to a preset path to form a two-dimensional cross-section of the part on the layer, and then the substrate is lowered by one The thickness of the powder layer continues the above steps until the parts are processed...

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