Method for producing sand coated iron mould of steel casting

Abstract

The invention discloses a method for producing a sand coated iron mould of a steel casting. The method is used for manufacturing of the complex steel casting. The method comprises the steps of manufacturing a coated sand core and upper and lower sand coated iron mould models for casting casting; putting internal chillers in the coated sand core and the upper and lower sand coated iron mould models; putting the coated sand core into the upper and lower sand coated iron mould models; carrying out model assembly and pouring; and turning a box to take out the casting. According to the method, the characteristic that a sand shell does not separate from the iron mould models is applied, chilling points are manually controlled through controlling thickness of the iron mould and the sand shell, the sand shell does not deform, a pouring system can be simplified, shrinkage cavities, heat cracks and other casting defects of the multi-hot spot complex steel casting are eliminated, inherent quality of the casting is dense, size precision of the casting is high, surface finish is close to that of precision casting, the casting is uniform and consistent and free of flash and burr, the deformation amount is low, the qualification rate of a casting product is greatly increased, the utilization amount of coated sand can be greatly decreased, the method has the obvious advantages that less casting sand is utilized and energy consumption is low, energy consumption during the mould manufacturing process and exhaust and waste residue discharge during the casting process are reduced, the working environment can be greatly improved, and labor intensity is reduced.

Description

technical field [0001] The invention relates to the technical field of product component casting, in particular to a sand-coating method for iron molds for producing complex steel castings. Background technique [0002] Mechanical product casting is usually divided into sand casting and special casting; special casting includes metal casting, investment casting, ceramic casting, low pressure casting, pressure casting, centrifugal casting, etc. The blanks of product parts are often formed by sand casting and investment casting. Sand casting is a traditional casting process that uses sand as the main molding material to make molds. However, when using sand casting to form complex steel castings, defects such as shrinkage porosity, sticky sand, slag inclusions, trachoma, and subcutaneous pores often occur. Defects affect the performance of castings and increase the rejection rate of castings. Investment casting is a casting method that uses a fusible (dissolvable) one-time mo...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a sand-coated iron mold method for producing steel castings, which fully utilizes the partial adjustment of the solidification sequence during the cooling process of the iron mold sand-coated casting process to realize the sequential solidification of the castings. , to solve casting defects such as shrinkage cavities and thermal cracks in complex steel castings with multiple hot spots