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An aluminum alloy ingot and additive manufacturing technology, applied in the field of metallurgy, can solve the problems of impossible large-scale ingot production, low efficiency of metal droplet forming, and low preparation efficiency
Active Publication Date: 2019-01-15
昆山晶微新材料研究院有限公司
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The selective laser remelting method does not have the above problems, and the solidified structure is ideal, but the preparation efficiency is low, the time required is long, and the cost is high, so it is difficult to be widely used in industrial large-scale ingot production
In the prior art, there is a metal droplet additive manufacturing method that uses a magnetic field to control the direct deposition of charged metal droplets, but the metal droplet forming efficiency is low, and it is impossible to be used for the production of large ingots
At present, there is no method to spray a large volume of melt into a stable continuous molten metal column by generating negative pressure and quickly condense it to form a large, special-shaped ingot with a fully equiaxed crystal structure without segregation.
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Embodiment 1
[0033] Such as figure 1 As shown, it is the array injection type large-size fully equiaxed crystal aluminum alloy ingot additive manufacturing device involved in this embodiment, including: inlet gate 1, diversion groove 2, aluminum liquid 3, insulation layer 4, air intake pipe 5, inert Gas 6, nozzle heater 7, baffle plate 8, condensation table 9, two-dimensional motion device 10, guide rail 11, support table 12, upper guide device 13, stopper rod 14, cavity heater 15, aluminum liquid chamber 16, nozzle 17. Liquid level gauge 18, casting ingot 19, cooling water pipe 20, airtight condensation chamber 21, motion control unit 22, down-leading device 23, vacuum pump 24, and master control unit 25.
[0034] The aluminum liquid chamber maintains 1 atmosphere, and the airtight condensation chamber is completely sealed. The pressure P can be adjusted by the vacuum pump 24 and the intake pipe. During the ingot preparation process, the pressure P is less than 1 atmosphere.
[0035] Suc...
Embodiment 2
[0044] In this example, the Al-4.5Cu aluminum alloy ingot is prepared by the same method as in Example 1. The temperature of the molten aluminum is set at 700°C, the diameter of the nozzle is 6mm, the horizontal moving speed of the cooling table is 260mm / s, and the spraying area of the array nozzle is The thickness of the ingot is 2m*5m, and the thickness of the ingot is 0.8m. After 60 minutes, a large ingot of 2m*5m*0.8m is prepared. The structure of the ingot is dense, without macro-segregation, and it is fully equiaxed, with an average grain size of 60-90 μm. The metallographic photos of the 1 / 4 and 1 / 2 positions along the centerline of the ingot cross section are as follows: Figure 6 , Figure 7 shown.
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Abstract
An array-jet large-size isometric aluminum alloy ingot additive manufacturing device and method are disclosed. The array-jet large-size isometric aluminum alloy ingot additive manufacturing device comprises a liquid aluminum spraying mechanism with array nozzles disposed in an atmospheric pressure chamber and a movable condensing mechanism located below the liquid aluminum spraying mechanism and arranged in a vacuum chamber and a control mechanism. The control mechanism sends an upward guiding command to a release mechanism and issues a three-dimensional movement command to the movable condensing mechanism, so that the aluminum liquid in the liquid aluminum spraying mechanism is sprayed to the surface of the movable condensing mechanism in a continuous array flow according to a preset pathand rapidly condensed to form an ingot. The array-jet large-size isometric aluminum alloy ingot additive manufacturing device has high production efficiency, and can prepare an oversized aluminum alloy ingot. The solidified structure is a full equiaxed crystal without macroscopic segregation.
Description
technical field [0001] The invention relates to a technology in the field of metallurgy, in particular to an array spraying type large-size fully equiaxed crystal aluminum alloy ingot additive manufacturing equipment and method. Background technique [0002] Semi-continuous casting is a method of manufacturing large-size aluminum alloy ingots routinely used in industry, mainly including two methods: one is hot top casting, and the other is direct chill casting. The advantage of hot-top casting is that the liquid level is stable during the casting process, but deep liquid pockets are formed in the center of the ingot, and the solidification structure contains a large area of columnar crystal regions, and the macro-segregation from the center to the edge of the ingot is serious, and there is a high Internal stress remains, the ingot is easy to crack, and the yield is low, so it is not suitable for the production of aluminum alloy ingots with high alloy content. The advantag...
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