Formation of the Structure and Mechanical Properties of Rolled Products for Cold Heading of Bolted Metal Products

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Formation of the Structure and Mechanical Properties of Rolled Products for Cold Heading of Bolted Metal Products

May 4, 2021 Engineering 0

The use of new materials or the creation of new technological processes for their production will result in products with high levels of physical and mechanical properties. In this regard, metals and alloys as the primary structural materials are being subjected to ever-increasing demands in terms of strength and plastic properties, formability, corrosion resistance, and service life, as well as unusual and novel functional characteristics. Simultaneously, there is a rising need to reduce labour costs in order to save money on solutions to increasingly serious environmental issues. Methods of cold heading out of rolled metal, which must have a certain consistency – the requisite plasticity, uniform structure and process parameters along the entire duration, as well as soundness – are a commonly used and most efficient way to obtain finished metal articles with high structural and mechanical properties. In order to increase the quality of upset metal articles in the face of fierce competition, businesses are forced to locate reserves at all points along the process chain for converting the original rolled metal. Except energy-intensive and labor-intensive annealing in protective gas furnaces and controlling surface defects with etching or mechanical operations has the greatest impact. This paper describes a cost-effective and environmentally friendly method for structural and mechanical upsetting of metal articles using high-quality rolled stock. It is demonstrated that after annealing with high-frequency current heating, drawing with reasonable degrees at each of the three stages of reduction ensures the absence of mill scale and ellipticity. In the pickling baths, the minor oxide layer was dissolved in a matter of seconds. This technology produces rolled steel with a highly scattered evenly spaced structure without a decarburized layer and increased plasticity, which reduces the amount of transitions in the upsetting of metal articles and increases tool service life. At the same time, annealing furnaces for rolled goods emit no harmful gases, and pickling solutions are refreshed less frequently.

Author (s) Details

A. A. Filipov
Nizhny Novgorod State Technical University Named after R. A. Alekseev, Minin St., 24, Nizhny Novgorod, 603950, Russia

G. V. Pachurin
Nizhny Novgorod State Technical University Named after R. A. Alekseev, Minin St., 24, Nizhny Novgorod, 603950, Russia

D. Yu Kozinov
Nizhny Novgorod State Technical University Named after R. A. Alekseev, Minin St., 24, Nizhny Novgorod, 603950, Russia

G. A. Gevogian
Nizhny Novgorod State Technical University Named after R. A. Alekseev, Minin St., 24, Nizhny Novgorod, 603950, Russia

View Book :- https://stm.bookpi.org/AAER-V10/article/view/755

 

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