Pinch roll on coiler for hot continuous rolling steel and preparation method thereof

Abstract

The invention discloses an upper pinch roll of a hot continuous rolling steel recoiling machine and a production method of the upper pinch roll. The upper pinch roll comprises a roller body formed by coiling and welding a steel plate and a main shaft, wherein a welding wire overlaying hardened layer with good thermal stability is arranged on the surface of the roller body; process rings are welded at two ends of the roller body during overlaying; inner shaft sleeves in interference fit with the main shaft are welded at two ends of the main shaft; two transition web plates are welded along the outer diameters of the inner shaft sleeves; outer shaft sleeves are welded on the outer edges of the transition web plates, are in interference fit with the roller body and are fixed with the roller body in a welding manner; and annular reinforced web plates are welded in an inner cavity of the roller body. As the roller body and the main shaft are fixed in a welding manner, loose mechanical assembly parts, such as flanges and bolts, are removed, the main shaft adopts an all-welding structure of the inner sleeves and the outer sleeves as well as the two transition web plates, the annular reinforced web plates are welded in the inner cavity of the roller body, and a welding wire with good thermal stability is adopted for overlaying. Therefore, the upper pinch roll has the advantages of simple structure, easiness in assembly, high rigidity, resistance in cold and hot crackability, wearing resistance, excellent impact toughness and long service life.

Description

technical field [0001] The invention belongs to the field of metallurgical machinery, and in particular relates to an upper pinch roll in coiling equipment on a hot continuous rolling steel production line and a preparation method thereof. Background technique [0002] At present, in the continuous hot rolling production line of steel plates of various specifications and materials, the coiler is the terminal equipment for coiling the plates. Its long-lasting technical accuracy directly depends on the yield of the steel coil, and the upper pinch roller is subjected to the combination of high temperature, high pressure, high speed, and severe wear in the coiling equipment, and the failure of the upper pinch roller seriously affects the coiling equipment. And the working cycle of the production line, the structure of the upper pinch roller and the wear resistance of the roller surface are the key to improving the service life of the pinch roller and maintaining the long-term pr...

AI Technical Summary

Problems solved by technology

The disadvantage is that the thermal stability, wear resistance and impact toughness of the hardened layer on the roll surface are poor, and the working life of the roll surface is relatively short.

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