Steel structure sand core, manufacturing method of steel structure sand core and bolt hole casting method

Abstract

The invention belongs to the technical field of casting, and relates to a steel structure sand core, a manufacturing method of the steel structure sand core and a bolt hole casting method. The steel structure sand core comprises a sand core body shell, a molding sand filling body and an exhaust hole, and the manufacturing method of the steel structure sand core comprises the steps that steel pipewelding is adopted, molding sand is filled, drying is carried out, and manufacturing of the finished steel structure sand core is finished. The bolt hole casting method adopts the finished steel structure sand core for finishing the casting molding of a bolt hole. According to the bolt hole casting method, the finished steel structure sand core is adopted for finishing the casting molding of the bolt hole. According to the steel structure sand core, during manufacturing, the working procedure is simple, operation is convenient, the manufacturing difficulty is low, and manufacturing is facilitated. During bolt hole casting, the casting quality of a casting can be improved, the construction period can be shortened, the bolt hole position precision is ensured, the later-period grinding workloads of the bolt hole can be reduced, the casting surface quality and the inherent quality of the casting can be improved, the production efficiency of the casting can be improved, and the constructionperiod can be shortened.

Description

technical field [0001] The invention belongs to the technical field of casting, in particular, the invention relates to a steel structure sand core, a manufacturing method of the steel structure sand core and a bolt hole casting method. Background technique [0002] In the foundry industry, the brick-inlaid staves of blast furnaces made of ductile iron are mostly made of manual molding with quartz sand as the main raw material to make casting molds. The bolt holes of the brick-lined stave of the blast furnace are obtained by cleaning the clay sand core in the mold after pouring it into a casting. The upper part of the clay sand core is in the shape of a cylinder, and the lower part is in the shape of a cuboid; the clay sand core is made by adding clay core sand and core bone specially used for sand cores into a wooden core box and making it by hand. The clay sand core adopts a single lower core head for fixed positioning and exhaust, and the upper end of the clay sand core ...

AI Technical Summary

Problems solved by technology

Clay sand cores are prone to uneven hardness during the manual pounding process. Therefore, long sand cores are difficult to pound and take a long time. They are prone to bending deformation during the opening of the core box and during storage and drying.

Moreover, because the clay sand core is surrounded by molten metal, the environment is harsh, and it is affected by the corrosion of the molten metal and the shrinkage of the liquid and solid states, it is very easy to have fleshy, sticky sand, unevenness, and hole shape deformation in the bolt hole. It makes it difficult to clean and grind the bolt holes, which seriously affects the permeability of the bolt holes and makes the installation bolts unable to penetrate normally.

Furthermore, the fixation and positioning of the lower core head alone is not reliable, and it is easy to produce deflection of the clay sand core during the box closing process, the metal liquid drills the exhaust channel, and the upper part of the bolt hole is fleshy, etc., which seriously affects the quality of the brick-mounted cooling stave of the blast furnace and production progress, which not only increases the production difficulty and workload of the operators in the early stage, but also brings difficulties to the cleaning and grinding process in the later stage

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