Molten metal thermal insulation air-cushion device and thermal insulation using method thereof

Abstract

The invention relates to a molten metal heat-insulation air cushion device, an air cushion shell (4) thereof is provided with a concave structure and a plurality of shunting pouring gates (10), an electrothermal tube (3) and an air cushion flange (2) are respectively arranged on the outer wall of the lateral side and at the outer end of the air cushion shell, and a lower port (8) of each shuntingpowering gate is less than an upper port (6) of each shunting pouring gate when the air cushion shell is in working state. A method for using the air cushion device comprises the following steps: firstly, the air cushion device is arranged at the lower part of ingates of a lower die of a metal die in the low-pressure casting, and an opening part of the air cushion shell of the air cushion device faces downwards and is airtight; the shunting pouring gates of the air cushion device and the ingates of the lower die of the metal die are butted and assembled to form a whole body together with the lower die of the metal die; and secondly, a liquid-lift nozzle on a maintaining furnace in the low-pressure casting and the air cushion flange of the air cushion device are longitudinally butted and assembled to form a whole body. The molten metal heat-insulation air cushion device can ensure that the surface of the upper part of the molten liquid in the liquid-lift nozzle can keep in liquid stateand does not freeze, thereby reducing the waste of the shutdown caused by the freeze of the pouring gates, saving the resources, and improving the working efficiency.

Description

technical field [0001] The invention relates to a metal liquid heat preservation device used in the low-pressure casting process and its heat preservation method used in the foundry industry, especially in the aluminum alloy low-pressure casting process, and relates to an inner gate installed at the bottom of the metal mold cavity A metal liquid heat preservation device between the mouth of the liquid metal liquid riser and the heat preservation method thereof. Background technique [0002] At present, in the known aluminum alloy low-pressure casting process, the metal liquid heat preservation device installed between the ingate at the bottom of the metal mold cavity and the nozzle of the metal liquid riser pipe is constructed and used for heat preservation as follows: Shaped metal tube or metal square box, on the outer wall of cylindrical metal tube or metal square box, a resistance wire is wound or an electric heating tube is worn, and an insulation cover is provided on th...

AI Technical Summary

Problems solved by technology

However, there is a common problem that the molten metal freezes at the ingate at the bottom of the metal mold cavity; sometimes, it is necessary to vertically superimpose two or three layers of the molten metal heat preservation device exposed on the top of the nozzle of the riser pipe. There must be a layer of asbestos gasket between the layers, so aluminum water leakage and air leakage are prone to occur, and a new asbestos gasket needs to be replaced

For this reason, the only way to stop production, disassemble the mold, riser, (multi-layer) insulation device, thus negatively affecting the normal and continuous die casting production of low pressure casting

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