Casting method of high-silicon cast iron with screw holes

Abstract

The invention provides a casting method of high-silicon cast iron with screw holes. The casting method comprises the following steps: process designing; modeling and core making; smelting and pouring: melting molten iron by adopting a primary mixing and secondary smelting mode, inoculating the molten iron, and pouring at low temperature; heat treatment; cleaning; and processing of a screw hole of the embedded part. A hollow corrosion-resistant column is pre-embedded in a high-silicon iron casting, the appearance is designed to be trapezoidal threads, the interior is designed to be hollow, threads are arranged outside the high-silicon iron casting, and after the casting is formed, internal threads are machined on the pre-embedded part; molten iron is smelted in manners of primary mixing, secondary smelting, fine adjustment degassing and the like, so that the problem that a high-silicon cast iron wire hole is difficult to process and form is solved, the processing time is shortened, the problems of shrinkage porosity, air holes, cracks and the like which are easy to generate in the casting production of high-silicon cast iron are effectively solved, and the yield of castings reaches more than 90%.

Description

technical field [0001] The invention belongs to the technical field of casting technology, and in particular relates to a casting method of high-silicon cast iron with wire holes. Background technique [0002] Adding a certain amount of certain alloying elements to cast iron can obtain alloy cast iron with higher corrosion resistance in some media. High silicon cast iron is one of the most widely used. A series of alloy cast irons containing 10% to 16% silicon are called high-silicon cast irons. Except for a few varieties with a silicon content of 10% to 12%, the general silicon content is 14% to 16%. When the silicon content is less than 14.5%, the mechanical properties can be improved, but the corrosion resistance is greatly reduced. If the silicon content reaches more than 18%, although the alloy is corrosion resistant, the alloy becomes very brittle and difficult to cast. Therefore, the most widely used in industry is high-silicon cast iron with a silicon content of 1...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a casting method of high-silicon cast iron with wire holes, which solves the problem that the high-silicon cast iron in the background technology is brittle, and the wire holes are difficult to process and easy to produce Pores, shrinkage porosity, cracks, etc., the disadvantages of low yield

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