A processing method for strengthening the wear resistance of cast iron rolls by adding extra particles

Abstract

The invention provides a machining method for enhancing abrasion resistance performance of a cast-iron roll by added particles. Carbide is generally added to enhance various properties of the roll inthe producing and machining process of the cast-iron roll, but the added carbide is easily gathered and not prone to being diffused, and the cast-iron structure is not remarkably improved. According to the machining method, chromium carbide, silicon carbide and nucleating agents are prepared into compound inoculants through a machining process of a core-spun yarn, spheroidization and inoculation are conducted in a wire feeding mode, the chromium carbide and silicon carbide are evenly dispersed in molten iron, the ball mill particle number and rate of spheroidization are improved, and the mechanical property of the roll is improved; and meanwhile, through modification of NbC / Fe compound powder modificator, growth of carbide is blocked, and graphite is refined, so that the carbide is uniformin size and distribution in the roll, and the performance is improved. The cast-iron roll is high in abrasion resistance performance, the production process is simple, high operability and feasibility are achieved, the application prospects are good, and the machining method is worthy of popularization.

Description

technical field [0001] The invention relates to the field of roll manufacturing, in particular to a processing method for strengthening the wear resistance of cast iron rolls by adding particles. Background technique [0002] In the national social and economic life, iron and steel materials occupy an extremely important position, and it is inevitable to use a large number of rolls to roll steel into profiles. The quality and production cost of steel are directly affected by the quality of rolls. The increasingly automated, heavy-duty and continuous steel rolling process and the increasingly harsh roll use conditions make the production and manufacture of high-performance rolls the most important research topic in the roll industry. The roll is an important consumable part in the rolling process, and the consumption cost accounts for about 5-15% of the entire rolling production cost. With the continuous improvement of the rolling technology, the adaptability of the roll to ...

AI Technical Summary

Problems solved by technology

The roll is an important consumable part in the rolling process, and the consumption cost accounts for about 5-15% of the entire rolling production cost. With the continuous improvement of the rolling technology, the adaptability of the roll to the working environment is also getting higher and higher. Due to The temperature of the rolled steel is as high as 900-1100°C, and the roll is in direct contact with it, so that the surface temperature of the roll can reach 500°C. During the rolling process of the roll, it must bear large rolling force and strong wear. It is easy to produce iron oxide scale, which will peel off from the surface of the roll when it is oxidized to a certain thickness. The peeled oxide scale will seriously affect the quality of the rolled material, resulting in an increase in the frequency of roll change. Contact, the surface of the roll needs to bear large cold and heat stress, the surface failure and thermal fatigue of the roll will have an adverse effect on the surface quality of the rolled product, and reduce the service life of the roll, so the roll used is required to have good heat, Mechanical properties and wear resistance, but most of the rolls currently on the market are far from meeting the needs of actual use. They are brittle and easy to wear, which greatly affects the rolling effect of steel. Therefore, there is an urgent need for a high-performance, high-resistant roll. Composite rolls with high grinding and long service life meet the rolling requirements of steel products in the market