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A method of grid cross structure arc additive forming based on thermal mass control
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A technology of additive forming and electric arc, which is applied in the field of additive manufacturing, can solve the problems of bulging of the intersection section and the difficulty of continuing the forming process, etc., and achieve the effect of improving the forming precision and improving the quality of the forming surface
Active Publication Date: 2022-04-05
BEIJING HANGXING MACHINERY MFG CO LTD
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Using arc-added materials, the direct overlapping of the cross section of the grid cross structure will cause serious uplift of the cross section, and the height of the cross section will gradually be higher than other parts, which will eventually make it difficult to continue the forming process
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[0033] Such as figure 2 As shown, the grid intersecting aluminum alloy structure required to be manufactured has a wall thickness of 10 mm, and a length, width, and height of 90 mm, 90 mm, and 80 mm, respectively, and a single arc sinusoidal swing additive forming is considered. The raw material used is ф1.2mm 2219 aluminum alloy welding wire. First, a set of suitable forming process parameters are obtained through experiments: current I=120A, wire feeding speed V w =8m / min, walking speed V t =10mm / s, swing frequency is 5Hz, swing amplitude is 3.5mm, stay time on left and right sides is 0.15s, under this set of process parameters, single pass weld width is 16mm, height is 1.3mm, then a, b and B in A The overlapping amount is 4mm; the pickled substrate is polished flat and wiped clean with absolute ethanol, and then fixed on the workbench to ensure its level; select a suitabl...
[0039] Such as Figure 4 As shown, the grid intersecting superalloy structural parts required to be manufactured have a wall thickness of 15mm, and a length, width, and height of 125mm, 125mm, and 105mm, respectively, and a single arc sinusoidal swing additive forming is considered. The raw material used is ф1.6mmGH4099 high-temperature alloy welding wire. First, a set of suitable forming process parameters are obtained through experiments: current I=130A, wire feeding speed V w =9m / min, walking speed V t =7mm / s, the swing frequency is 7Hz, the swing amplitude is 4.5mm, and the stay time on the left and right sides is 0.20s. The overlapping amount is 7.3mm; the pickled substrate is polished flat and wiped clean with absolute ethanol, and then fixed on the workbench to ensure its level; select a suitable position on the substrate to start the arc additive forming of the grid cro...
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Abstract
The invention provides a grid cross structure arc additive forming method based on thermal mass control, comprising the following steps: when there are odd layers, the two sides of the grid cross structure are set as A and B, side B is formed directly, and side A is divided into Section 3: overlapping sections a, b and crossing section c, the forming process parameters determined in step 1 are adopted for overlapping sections a and b, and the wire feeding speed of crossing section c is set to 0; The sides are A' and B' respectively, A' is directly formed, and B' is divided into three sections: overlapping section d, e and crossing section f, the overlapping sections d and e adopt the forming process parameters determined in step 1, and the crossing section f The wire feeding speed is set to 0, so reciprocating, the arc additive forming of the cross structure is completed. The grid intersecting structure electric arc additive forming method proposed by the present invention effectively avoids the uplift of the intersecting section caused by direct lapping through precise control of heat mass input, ensures the smooth progress of the entire material adding process, and can ensure that the intersecting section is well connected.
Description
technical field [0001] The invention belongs to the field of additive manufacturing, and relates to an arc additive forming method, in particular to a grid cross structure arc additive forming method based on thermal mass control. Background technique [0002] Additive manufacturing technology is based on the discrete-stacking principle, through the layer-by-layer melting and deposition growth of metal materials by a given heat source, and the near-net-shaping high-performance structural parts directly from the 3D model is an important direction for the development of advanced manufacturing of structural parts in the future. Among them, arc additive is an additive manufacturing technology that uses arc heat as the heat source and wire as the raw material. Compared with other metal additive manufacturing technologies, the cost of the entire system of arc additive manufacturing is a fraction or even a tenth of the cost of laser additive manufacturing, and the cost of equipment...
Claims
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