Crystallizer with changeable cooling intensity in semicontinuous casting of aluminum alloy

Abstract

The invention provides a crystallizer with changeable cooling intensity in semicontinuous casting of aluminum alloy. The crystallizer is provided with an upper water cavity and a lower water cavity; a decompression cavity is arranged at the bottom of the upper water cavity; decompression cavities are arranged on the top and the bottom of the lower water cavity; a third group of cooling water holes are arranged on the decompression cavity of the upper water cavity; a first group of cooling water holes are arranged on the decompression cavity at the top of the lower water cavity; a second group of cooling water holes are arranged on the decompression cavity at the bottom of the lower water cavity; the first group of cooling water holes and the second group of cooling water holes are in a same vertical plane and are in intersection with the third group of cooling water holes; the angles of the first group of cooling water holes and the second group of cooling water holes are bigger than 40 degrees; and the angles of the third group of cooling water holes are less than 40 degrees. According to the invention, two groups of cooling water flow with high incident angles are adopted, and the pressure of cooling water flow with the high incident angle can be greatly reduced under the same quantity of cooling water flow, so that the water returning phenomenon caused by excessive pressure and surface cracks of a cast ingot caused by the water returning phenomenon can be effectively avoided.

Description

technical field [0001] The invention relates to a crystallizer with variable cooling intensity for aluminum alloy semi-continuous casting, and belongs to the technical field of aluminum alloy semi-continuous casting. Background technique [0002] Direct cooling semi-continuous casting is currently the main way for aluminum alloy enterprises to produce aluminum alloy round ingots and flat ingots. The liquid aluminum melt is poured into the space surrounded by the crystallizer and the dummy head. The aluminum melt is cooled by the mold and the dummy head and solidified along its boundaries. When the aluminum melt reaches a certain height in the crystallizer and the solidified shell has sufficient strength to support the aluminum melt, the dummy head will move downward at a given casting speed. The solidified ingot will descend together with the dummy head. When the ingot is pulled out of the crystallizer, the cooling water in the crystallizer is directly sprayed onto the sur...

AI Technical Summary

Problems solved by technology

However, in this cooling mode, when the cooling water flow rate increases to a certain level, due to the excessive water pressure, the cooling water flow with a high incident angle hits the surface of the ingot and spreads out, which will easily cause part of the water flow to return upward along the surface of the ingot. In severe cases, it enters the surface of the molten aluminum inside the crystallizer, resulting in uneven cooling of the ingot and surface cracks

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