Hollow round ingot casting hot-top casting device and method for casting hollow tube thereof

Abstract

A hollow circle cast ingot hot top casting device and a method of manufacturing a hollow tubular product relate to a device and a method used in casting thin-walled hollow tube. The device consists of an overcoat, a mandrel support, a core and a continuous processing machine of core hot top, a core graphite set, a condensate tank, a hot top of condensate tank and a graphite bush of condensate tank, a core intake pipe, a water outlet, a water inlet tank, a water outlet of condensate tank an a dummy ingot. The manufacture method is: high-temperature aluminum alloy liquid flows from an opening of the hot top of condensate tank and the core hot top and is cooled by cooling water in the core and the condensate tank. The dummy ingot is driven by a semicontinuous casting machine and moves down at a steady speed, thereby making the liquid steadily flow into a crystalline belt in which the liquid crystallizes slowly to form an ingot tube. Surface segregation aliquation float of thin-walled hollow tube manufactured by the present invention is less than 1mm. A crystal grain with few air holes and inclusion defects is small. Grain size is up to the first grade and metal plasticity is improved, which is favorable for processing and able to reduce cost. Moreover, the present invention is able to create good environment for operation and produce little environmental pollution.

Description

technical field [0001] The invention relates to a device for casting a thin-walled hollow tube and a casting method thereof. Background technique [0002] At present, only solid round ingots have achieved hot-top casting in China. Hollow wall tubes are casted by ordinary crystallizers. Since the liquid level is controlled manually during casting, it is very unstable, and the height of the liquid level controlled by different operators is different, and the oxide film is often destroyed, resulting in a large number of oxide inclusions. In the casting ingot, since the height of the crystallization zone is above 80mm, there is a chance of secondary remelting, so the defect of segregation floats is serious, the height of surface segregation can reach 2-3mm, and the deepest can reach 5mm, especially for large-scale Φ300*(40- 50mm) ingot, the casting yield is only about 50%; in addition, due to the thin wall (30-50mm), the liquid flow center is not easy to control, so it is easy ...

AI Technical Summary

Problems solved by technology

Hollow wall tubes are casted by ordinary crystallizers. Since the liquid level is controlled manually during casting, it is very unstable, and the height of the liquid level controlled by different operators is different, and the oxide film is often destroyed, resulting in a large number of oxide inclusions. In the casting ingot, since the height of the crystallization zone is above 80mm, there is a chance of secondary remelting, so the defect of segregation floats is serious, the height of surface segregation can reach 2-3mm, and the deepest can reach 5mm, especially for large-scale Φ300*(40- 50mm) ingot, the casting yield is only about 50%; in addition, due to the thin wall (30-50mm), the liquid flow center is not easy to control, so it is easy to produce gate cracks

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