Micro-domain semi-solid state additive manufacturing method
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A kind of additive manufacturing and semi-solid technology, which is applied in the direction of manufacturing tools, additive processing, welding/cutting media/materials, etc. It can solve the problems of inconvenient operation, inability to deal with waste, and no fundamental solution to the problem, so as to eliminate air holes Effect
Active Publication Date: 2017-12-01
BEIJING UNIV OF TECH
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Problems solved by technology
Although these methods can alleviate the above-mentioned problems to a certain extent, they require special equipment, additional processes, inconvenient operation, and affect processing efficiency. Some large-sized components cannot even be processed or cost a lot.
In short, these methods have alleviated the degree of these defects to a certain extent, but have not fundamentally solved the problem
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specific Embodiment approach 1
[0028] Specific implementation mode 1: The material of the consumables in this embodiment is 304 stainless steel round rods, the diameter The base material is Q235 low carbon steel, the angle between the consumable rod and the accumulation layer is 75°, the angle between the laser beam and the accumulation layer is 15°, the laser power: 4KW, the laser focus spot is rectangular, and the size is 6mm×1mm.
[0029] The specific forming process includes the following steps:
[0030] 1. Establish a 3D model of metal parts, complete the slicing process through software and generate machine processing paths;
[0031] 2. Remove the oxide film and dirt on the surface of the substrate and consumables;
[0032] 3. Arrange the relative positions of consumables, substrate and laser according to the setting, fix the substrate, and clamp the consumables with three claws with water cooling;
[0033] 4. Turn on the power to make the three claws carry the rod-shaped consumables to rotate at a...
specific Embodiment approach 2
[0040] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the consumables are two pieces arranged side by side with a diameter of The metal bar, other steps and parameters are the same as in Embodiment 1.
specific Embodiment approach 3
[0041] Specific implementation mode three: as image 3 , the difference between this embodiment and the specific embodiment one is: the heat source is Tig, the angle between the welding torch and the accumulation layer is 55°, and the diameter of the consumption rod is The angle between the consumable rod and the accumulation layer is 60°, the current is 200A, the processing speed is 0.3m / min, the axial thrust of the consumable is 100N, and other steps and parameters are the same as those in Embodiment 1.
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Abstract
The invention provides a micro-domain semi-solid state additive manufacturing method. The problems about structure homogeneity, performance reliability, stress and deformation, air holes and cracks and the like of a molding piece are mainly solved. A stick-shaped material serves as a consumable item, and heating manners such as high energy beams, electric arcs and resistance heat are adopted for acting on the front end of the consumable item to enable the front end to be in a solid-liquid two-phase coexistence semi-solid state; and meanwhile, rotating twisting force and axial thrust are applied to the consumable item to conduct powerful effects such as shearing, stirring and extruding on semi-solid state metal, and in other words, mold-free semi-solid state flowing deformation molding is carried out. The consumable item is transited to bottom layer metal continuously in the manner to form metallurgical bonding, the stacking process is repeated according to a planned route obtained after discretization slicing treatment, and then a solid piece or a stacking layer in a special shape can be formed. The micro-domain semi-solid state additive manufacturing method is simple in operation process, the part performance is excellent, many defects in traditional additive manufacturing are overcome, and the prospects in the aspects of large structure shaping, damaged part repairing and composite material preparation are wide.
Description
technical field [0001] The invention relates to the technical field of metal additive manufacturing, and in particular provides a metal additive manufacturing method with metal semi-solid processing properties. Background technique [0002] In the existing metal additive manufacturing technology, due to multiple non-equilibrium thermophysical processes and metallurgical processes, the component structure, performance uniformity and stability are poor, the tendency of deformation and cracking is serious, and defects such as pores, shrinkage cavities and lack of fusion are prone to occur. The problem seriously affects the service performance of additive parts, and also brings great difficulties to the development and promotion of additive manufacturing technology. [0003] Usually, post-densification treatment is required to solve defects such as pores: usually hot isostatic pressing treatment; heat treatment is used to control the microstructure morphology; preheating, heat t...
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