Additive manufacturing thin-wall rotating member anti-deformation device and application method thereof

Abstract

The invention discloses an additive manufacturing thin-wall rotating member anti-deformation device and an application method thereof. According to the characteristics that the cross-sectional size ofan additive manufacturing thin-wall rotating member changes continuously along with the change of height and the size of the thin-wall rotating member is larger, the size of a support frame further changes continuously, that is, a fixed screw rod is used as a vertical support frame in the vertical direction, and the outer diameters of transverse support rings change continuously along with the change of the size of the rotating member; and the outer diameter of the support ring at the vertical center position is the largest, and the outer diameters of the support rings are gradually reduced upward or downward, and the outer walls of the support rings are always in contact with the inner wall of the rotating member to play a supporting role. According to the additive manufacturing thin-wall rotating member anti-deformation device, the size of the device can be stably controlled within a range of manufacturing blanks, so that the printing yield is improved; and the device is an assemblypart, and can be disassembled integrally or in parts, so that cyclic utilization is convenient.

Description

【Technical field】 [0001] The invention belongs to the field of additive molding (3D printing), and in particular relates to an anti-deformation device for additively manufactured thin-walled rotary parts and a method for using the same. 【Background technique】 [0002] Additive manufacturing is a technology based on digital model files, using powdered materials or wire materials to construct objects by stacking and accumulating layer by layer. [0003] At present, in all metal additive manufacturing processes, in order to ensure that the N+1 layer is firmly connected to the N layer, a certain amount of heat input is required to partially melt the N layer to form a metallurgical connection, but as the printing process progresses, heat accumulation gradually increases , and the heat dissipation rate decreases with the increase of the distance between the heat source and the substrate, which causes the heat accumulation to gradually become serious with the printing process, and ...

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Problems solved by technology

[0003] At present, in all metal additive manufacturing processes, in order to ensure that the N+1 layer is firmly connected to the N layer, a certain amount of heat input is required to partially melt the N layer to form a metallurgical connection, but as the printing process progresses, heat accumulation gradually increases , and the heat dissipation rate decreases with the increase of the distance between the heat source and the substrate, which causes the heat accumulation to gradually become serious with the printing process, and this phenomenon is more obvious in the arc additive manufacturing process, because the arc additive manufacturing requires greater heat input to form a molten pool

[0004] When the heat accumulates to a certain extent, a large temperature gradient will be generated on the workpiece, so the unevenness of cold and heat will form thermal stress. As the printing process continues, the stress distribution will gradually change with the change of the thermal field, which will lead to Parts are deformed, resulting in excessive dimensional deviation of the part or even scrapping

[0005] There are two main solutions to the problem of heat accumulation in the field of metal fuse additive manufacturing. One is substrate cooling, which works well for small structural parts, but is currently less effective when the size of the structural parts is larger; The other is idle waiting, that is, adding waiting time during the printing process, and using cooling gas to cool the part, but this method will reduce printing efficiency and prolong the preparation cycle, and at the same time, the uniformity in the cooling process cannot be guaranteed

For example, for a hollow sphere with a diameter of 1m and a wall thickness of 10mm, the deformation after additive printing is 2mm-10mm. Both solutions are difficult to ensure the stability of the printing process.

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