Machining method of bi-metal composite roller sleeve and bi-metal composite roller sleeve

Abstract

The invention discloses a machining method of a bi-metal composite roller sleeve. The machining method of the bi-metal composite roller sleeve includes the following steps that (a), an outer steel mold prepared in advance is erected on a centrifugal rotating mechanism, the axis of the outer steel mold is in a horizontal state, a casting nozzle stretches into the outer steel mold from one end of the outer steel mold, the casting nozzle moves in the axial direction in the outer steel mold manipulatively, and the casting nozzle communicates with a casting cup; (b), the centrifugal rotating mechanism is started, the rotating speed of the centrifugal rotating mechanism is set to be 750-1200 r/min, and the centrifugal rotating mechanism drives the outer steel mold to do the rotating movement; and (c), a roller sleeve outer layer of the composite roller sleeve is firstly cast, after the roller sleeve outer layer is cast into the designed thickness, cooling is performed for 3-5 min, then a roller sleeve inner layer of the composite roller sleeve is cast, and casting stops after the roller sleeve inner layer reaches the designed thickness. The invention further discloses the bi-metal composite roller sleeve. Due to the fact that centrifugal casting is adopted, the cast roller sleeve outer layer and the cast roller sleeve inner layer are better in compactness, especially when the rollersleeve inner layer is cast in the second stage, due to the centrifugal force, molten metal of the roller sleeve inner layer is thrown to the roller sleeve outer layer, the proportion and the depth forthe roller sleeve inner layer molten metal to permeate into the roller sleeve outer layer are further improved, and therefore the roller sleeve outer layer and the roller sleeve inner layer are combined better.

Description

technical field [0001] The invention relates to the technical field of metal rolls and processing, in particular to a processing method for a bimetallic composite roller sleeve and a bimetallic composite roller sleeve manufactured by the processing method. Background technique [0002] The roll is the most important consumable part in steel rolling production. It is also known as the "mother of steel". my country produces about 800,000 tons of rolls every year. Most of the currently used rolls are traditional integral rolls or sleeve-type composite rolls, and sleeve-type composite rolls are currently only used in the field of bar and wire rolling. The sleeve-type composite roll is composed of a roll shaft and a roll sleeve. The roll sleeve is nested outside the roll shaft and is driven by the roll shaft to contact the steel billet to cause plastic deformation of the steel billet. The roll sleeve needs to withstand a large rolling force when in use, and there is a large slid...

AI Technical Summary

Problems solved by technology

And the current bimetallic composite roll, one method is to use the pre-fabricated roll inner sleeve and roll jacket, and then use mechanical pressure to press the roll inner sleeve into the roll jacket to form a bimetallic composite roll sleeve, and then perform necessary heat treatment , such a combination method has the defects of incomplete combination and gaps in the bonding layer; another method is to fix the inner steel core and the outer mold, and cast the alloy steel liquid by bottom casting method to form the roll jacket. This combination method is also There will be defects such as impurities and bubbles in the bonding layer

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