Centrifugal high-carbon, high-boron and high-speed steel composite roller shell and fabrication method of combined roller of composite roller shell

Abstract

The invention discloses a centrifugal high-carbon, high-boron and high-speed steel composite roller shell and belongs to the technical field of casting. An outer layer of the roller shell is made of a high-carbon, high-boron and high-speed steel material; an inner layer of the roller shell is made of graphitic steel; good metallurgical bonding is achieved by centrifugal casting; an appropriate heat treatment process is adopted for property improvement on the high-carbon, high-boron and high-speed steel composite roller shell; a high-carbon, high-boron and high-speed steel combined roller is fabricated by a hot charging method; the high-carbon, high-boron and high-speed steel composite roller shell can be replaced after being abraded; and the cyclic utilization of a roller shaft is achieved. Compared with a high-speed steel roller by centrifugal casting, the material utilization ratio is increased by more than 30%, and the service life is prolonged by more than 20%.

Description

technical field [0001] The invention belongs to the field of casting technology, and relates to a centrifugal composite high-carbon, high-boron high-speed steel composite roll sleeve and a method for manufacturing the hot-packed combined roll, which is suitable for high-quality special steel bar and wire rolling mills. Background technique [0002] High-boron high-speed steel rolls are developed on the basis of high-speed steel rolls by adding an appropriate amount of boron to high-speed steel. Adding an appropriate amount of boron to high-speed steel, on the one hand, can partially replace precious alloy elements such as tungsten, molybdenum, and vanadium in high-speed steel rolls, and reduce the production cost of high-speed steel rolls; Compounds that can significantly improve the wear resistance of high-speed steel rolls. The use of high-boron high-speed steel in roll production is of great significance for reducing roll production costs and improving the surface qualit...

AI Technical Summary

Problems solved by technology

The invention has the advantages of low energy consumption and short heat treatment cycle, but its disadvantages are that problems such as segregation and poor interface bonding between inner and outer layers are prone to occur during the casting process of the roll, which affects the quality and service life of the roll.

Chinese patent CN101439351A "A manufacturing method of centrifugal casting high-boron high-speed steel composite roll" After the high-speed steel liquid is cooled by an inclined cooling plate, it is poured into the high-speed rotating metal mold on the centrifuge, and water is sprayed to cool the mold during the pouring process , then centrifugally cast the middle layer, and finally cast steel or alloy ductile iron in the core of the roll under static conditions to obtain a high-boron high-speed steel composite roll. The high-boron high-speed steel composite roll of the invention has a fine outer structure and no element segregation Advantages, but its disadvantage is that during the pouring process, the temperature drop of the molten steel flowing on the cooling plate is difficult to control, and it is difficult to achieve smooth pouring. In addition, spraying water to the mold during the pouring process accelerates the solidification of the molten steel. The casting stress and thermal stress of the centrifugal casting slab are increased, thereby increasing the risk of cracking of the centrifugal casting slab. In addition, the high-speed rotating and heated casting mold has the risk of quenching and cracking during the water spray cooling process, thus causing safety accidents

In addition, the high-boron high-speed steel rolls produced by the existing invention technology basically have the problem that after the outer high-speed steel material is worn out, the roll core can only be recycled by re-melting, resulting in waste of materials and energy