Sand Casting Method for Slender Cast Iron Rods

Abstract

A sand casting method for slender cast iron rods is provided. According to the size of the cast iron rods in the design drawings, a core box with a rod-shaped mold is made inside, and the original sand, furan resin and curing agent are mixed and stirred and put into the core box. After curing, pull out the rod-shaped mold from the core box to form a sand core with multiple holes, put the dried sand core and the wood blocks on both sides of the sand core and can block all the holes. In the sand box, after the mixture solidifies, take out the wooden block, and the molten iron flows from the pouring cavity through the mold hole to the overflow cavity at the lower orifice of the mold hole. After all the mold holes, the pouring cavity and the overflow cavity are filled, the pouring is completed. The invention can realize the high-efficiency production of ductile iron and gray cast iron slender cast iron rods of various specifications, and adopts the inclined pouring method to solve the problem of poor fluidity of molten iron caused by horizontal pouring and the problem of venting of mold holes caused by vertical pouring. It can not only produce cast iron mandrels for casting, pig iron bars for machining, but also be used to produce gas welding electrodes of various specifications with the same material as castings.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a sand casting method for slender cast iron rods. Background technique [0002] In foundry production, chilled iron rods are often used as the core bone of complex thin-walled or large sand molds. Compared with cast iron rods and steel bars as the core bone, the cast iron core bone does not deform and has good rigidity. For complex casting cavities, cast iron core bone It is brittle and can be cleaned by smashing to avoid the phenomenon that the core bone of the complex cavity cannot be pulled out. The traditional sand cores for small and medium-sized sand cores use steel bars or iron wires as the cores. The advantages are good elasticity, easy to bend into various complex shapes of cores, and easy operation. When cleaning the castings, the cores can be cleaned with wire pliers, etc. The tool is pulled out; the disadvantage is that the sand core is easily deformed du...

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is to provide a sand casting method for slender cast iron rods. By setting pouring chambers and overflow chambers connected with the mold holes on both sides of the sand core with a plurality of inclined holes, various The high-efficiency production of slender cast iron rods of ductile iron and gray cast iron, adopts the inclined pouring method, which solves the problem of poor fluidity of molten iron caused by horizontal pouring and the problem of venting holes caused by vertical pouring, and can produce castings Cast iron mandrel and pig iron bar for machining can also be used to produce gas welding electrodes of various specifications with the same material as the casting

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