Centrifugal casting method of coated sand shell type cast steel

Abstract

The invention discloses a centrifugal casting method of coated sand shell type cast steel. The centrifugal casting method of the coated sand shell type cast steel comprises the following steps that high-strength coated sand is manufactured, coated sand raw sand is refined, silicon content of the raw sand is required to be more than or equal to 99.6%, and the raw sand is scrubbed and dried by tertiary water; shell-type is fixed to a centrifugal rotating table, and the coated sand shell type is fixed to the centrifugal rotating table; molten steel is smelted; rotating is started, molten steel pouring is carried out; the rotating is stopped, and parts are taken out. According to the centrifugal casting method of the coated sand shell type cast steel, the production rate can reach 95%, and thequalified rate of product leakage detection can reach more than 98%. Compared with an original coated sand shell type process, smelting power consumption of 52.6% can be saved, smelting alloy consumption is reduced by 30%, two welt risers can be omitted in per product, the cutting is reduced, and polishing workload can reach 80%.

Description

technical field [0001] The invention relates to the technical field of precision casting, in particular to a centrifugal pouring method for film-coated sand shell cast steel. Background technique [0002] In the field of precision steel castings, due to factors such as high cost, long period, and environmental protection, the investment casting process has gradually turned to the coated sand shell casting process. Through the improvement of the performance of the coated sand, batches have been promoted in the precision casting industry. application. However, in the production of products with special performance requirements, there are still problems of high cost and low yield. For example, the production of cast steel valve bodies currently adopts the film-coated sand shell casting process. In order to ensure the anti-leakage requirements of the products, the utilization rate of molten steel Only 40%-50%, the average pass rate of leakage detection is 80%, because the marke...

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Problems solved by technology

However, in the production of products with special performance requirements, there are still problems of high cost and low yield. For example, the production of cast steel valve bodies currently adopts the film-coated sand shell casting process. In order to ensure the anti-leakage requirements of the products, the utilization rate of molten steel Only 40%-50%, the average pass rate of leakage detection is 80%, because the market demand for this product is large, and the annual cost waste is large

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