Grate production process for steel mill sintering apparatus

Abstract

The invention discloses a production process of a grate bar used for sintering equipment of steelworks. The production process comprises the following steps of: mixing molding sand, namely, adding 4-5% of modified water glass to 50% of base sand (50 / 70 meshes) and 50% of base sand (70 / 140 meshes) so as to prepare the molding sand; modeling, namely, adopting a vertical molding process, injecting CO2 and then carrying out the patter drawing; coating, namely, coating the quick-dry alcohol-based coating in a curtain coating way; molding integration, namely, vertically molding the sand mold in series correspondingly; finally, preparing corresponding risers and runners for pouring-forming. The production process completely meets the special quality requirement of the grate, the production cost can be reduced by more than 10%, furthermore, the production efficiency can be improved, especially the environmental pollution can be reduced, the utilization ratio of the resource can be improved and the energy resource consumption can be reduced.

Description

technical field [0001] The invention relates to a production process of a casting, in particular to a production process of a high-chromium heat-resistant casting. Background technique [0002] Furnace bars for sintering equipment in steel mills are high-chromium heat-resistant castings, and the demand is huge, but their quality requirements are relatively high. In addition to the requirements of material composition, the dimensional accuracy of castings reaches ISO80626 level, longitudinal and transverse curvature ≤ 0.5mm, surface finish ≤ 50S, since the 1990s, due to price competition, major developed countries in the world, especially Japan The furnace bar production in China is gradually transferred to China, and its production process is continuously updated. From the initial mass production of shell casting technology in Japan to 1996, our institute successfully developed investment casting technology using water glass as binder to mass produce various types of furnac...

AI Technical Summary

Problems solved by technology

Not only are there many processes, but the production cycle is long (about 3 days), and two of the processes consume energy

[0005] However, since 2000, due to factors such as the price increase of metal materials and casting raw and auxiliary materials, and the appreciation of RMB, the investment casting process using water glass as a binder to produce various types of furnace bars has lost its original Market Competitiveness

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