Production technology of sandwich core-spun yarn

Abstract

The invention discloses a production technology of a sandwich core-spun yarn. The central part of the yarn is composed of 100% pure magnesium pellets, the middle layer is composed of mixed powders, and the outermost layer is formed by rolling a steel strip. According to the technological method, three hoppers capable of regulating flow are used to replace an original single hopper. A second hopper is used for holding the pure magnesium pellets, and a first hopper and a third hopper are used for holding the same mixed powders composed of silicon iron, calcium silicon, rare earth ferrosilicon and the like. The low-carbon steel strip of 0.2-1 mm thick is rolled by a core spinning unit to obtain a sandwich core-spun yarn with the yarn diameter of phi 9-16mm and different magnesium contents. The production technology has advantages as follows: production cost is low; magnesium absorptivity is raised; and the product can be prepared at arbitrary ratio of components.

Description

technical field [0001] The invention relates to a production process, in particular to a production process of a sandwich cored wire. Background technique [0002] Feeding wire spheroidization with cored wire has been popularized and used in my country's cast iron industry for 15 years, and has the advantages of reducing pollution, accurate control, and improving casting quality. However, due to the high cost, some foundry companies are reluctant to use it. [0003] There is a problem: [0004] 1. The cored wire using alloy powder, due to the secondary remelting of magnesium, causes the increase of magnesium oxide, reduces the effective magnesium content, and the absorption rate of magnesium can only reach 25-30%, and because magnesium is easy to burn in remelting Generally, the magnesium content of the cored wire is difficult to exceed 30%, and the core wire is added in a large amount and the cost is high. [0005] 2. For the cored wire made by mixing pure magnesium part...

AI Technical Summary

Problems solved by technology

[0004] 1. The cored wire using alloy powder, due to the secondary remelting of magnesium, causes the increase of magnesium oxide, reduces the effective magnesium content, and the absorption rate of magnesium can only reach 25-30%, and because magnesium is easy to burn in remelting Generally, the magnesium content of the cored wire is difficult to exceed 30%, and the core wire is added in a large amount and the cost is high.

[0005] 2. The cored wire made by mixing pure magnesium particles and related powders, due to the difference in specific gravity between magnesium and other alloy powders, when the evenly mixed powder flows out from the hopper, it will cause unevenness of the powder again

Deviations that lead to the final spheroidization effect

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