Inert gas shielding immersion type heating difunctional low-pressure casting furnace

Abstract

The invention provides an inert gas shielding immersion type heating difunctional low-pressure casting furnace. A lining of an aluminum melting pool consists of a high nitrogen composite ceramic brick, a light mass thermal insulation layer, a thermal insulation material and a thermal insulation composite material; an immersion type heater and an immersion type heater adopt heating elements formed by mounting resistance wires in silicon nitride ceramic pipes; the immersion type heater is inserted in the aluminum melting pool from the upper end of a furnace cover, and the immersion type heater is directly immersed in the aluminum melting pool from the external of a furnace shell to realize dual heating; an intake port is connected with a compressed preheated inert gas generation device, and an exhaust port is connected with a gas recovery device; a liquid rise pipe and the immersion type heater are immersed in molten aluminum; two immersion type heaters are mounted at the bottom of the aluminum melting pool; and the lower end of the liquid rise pipe is higher than the immersion type heaters at the bottom. The inert gas shielding immersion type heating difunctional low-pressure casting furnace is uniform in heating speed, high in heat efficiency, low in energy consumption and excellent in thermal shock property, saves the cost, and is suitable for serving as an aluminum alloy casting furnace for use.

Description

technical field [0001] The invention belongs to the technical field of low-pressure casting, in particular to an inert gas-protected immersion heating double-function low-pressure casting furnace. Background technique [0002] The general-purpose low-pressure casting holding furnace is generally heated by silicon carbide rod radiation, and the heat heats the molten aluminum in the furnace through radiation and air conduction. The holding furnace has the following problems in the application process: 1. It affects the continuity of production. When adding aluminum liquid, the heating power supply must be cut off to stop production; 2. The heating of silicon carbide rods is radiant heating, and the heating efficiency is low. The increase of surface oxides will increase the generation of slag inclusion waste products; 3. The heating life of silicon carbide rods is short, generally 1 to 2 months is the replacement period, resulting in reduced labor costs and work efficiency. 4....

AI Technical Summary

Problems solved by technology

The holding furnace has the following problems in the application process: 1. It affects the continuity of production. When adding aluminum liquid, the heating power supply must be cut off to stop production; 2. The heating of silicon carbide rods is radiant heating, and the heating efficiency is low. The increase of surface oxides will increase the generation of slag inclusion waste products; 3. The heating life of silicon carbide rods is short, generally 1 to 2 months is the replacement period, resulting in reduced labor costs and work efficiency

4. The lining material of the molten aluminum pool of the general low-pressure casting holding furnace is made of traditional castables, which are easy to produce polymers at high temperatures. With the prolongation of production time, the space of the molten aluminum pool becomes smaller and the melt is clean. 5. The original pressurization method is compressed air, and the furnace is filled and discharged with compressed air, which will take away a lot of heat and increase the consumption of electric energy; 6. .The compressed gas is air, which increases the amount of hydrogen and oxygen in the molten aluminum, and the castings are prone to pinholes, resulting in an increase in unqualified products

Images