Energy-saving roasting method for investment casting shuttering

Abstract

The invention discloses an energy-saving roasting method for an investment casting shuttering, which comprises the following steps: fully placing trays (2) provided with shuttering to be roasted on an upper-layer roller way (1.1) in a heat exchange furnace (1); fully placing trays (2) provided with the cast shuttering on a lower-layer roller way (1.2) of the heat exchange furnace (1); roasting the shuttering to be cast by using accumulated heat of the cast shuttering; pushing the trays (2) provided with the shuttering to be roasted onto the lower-layer roller way (1.1), and performing sand filling, casting and sand falling on the roasted shuttering on an interlocking machine (10); and pushing the trays (2) provided with the cast shuttering onto the lower-layer roller way (1.2). The method has high heat efficiency, low energy consumption and low cost.

Description

technical field [0001] The invention relates to a casting method, in particular to an energy-saving investment casting mold shell roasting method. Background technique [0002] Regardless of whether water glass, ethyl silicate, or silica sol is used as a binder alone, or two kinds of composite investment casting, the mold shell after investment must be dried at low temperature and fired at 900-1100°C to make it Ceramicization, improving strength and increasing air permeability requirements. At present, most factories in China use coal heating to dry and roast mold shells, but they have to give up because they cannot meet the environmental protection standards; natural gas cannot be widely used because the supply is not popular and cannot be guaranteed; therefore, most factories are or are planning to adopt method of electric heating. However, in the actual operation of electric heating drying and roasting formwork, due to the low thermal efficiency of the system, the power...

AI Technical Summary

Problems solved by technology

At present, most factories in China use coal heating to dry and roast mold shells, but they have to give up because the environmental protection cannot meet the standards; natural gas cannot be widely used because the supply is not popular and cannot be guaranteed; therefore, most factories are or plan to adopt electric heating method

However, in the actual operation of electric heating drying and roasting formwork, due to the low thermal efficiency of the system, the power consumption is generally 540KHW / ton of molten steel, which is about 80% of the energy consumption of smelting and about 30% of the total energy consumption of casting.

In addition, due to the evaporation and decomposition of water in the mold shell, the resistance wire will have a hydrogen embrittlement effect, and the addition of a protective cover to protect the resistance wire will increase the cost of the equipment and further reduce the electrical efficiency

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