Composite roll and preparation method thereof

Abstract

The invention provides a composite roll. The composite roll comprises a roll shaft and roll rings arranged on the roll shaft in a sleeving manner. The roll shaft and the roll rings are in clearance fit. A nut is arranged at the position, on one side of each roll ring, of the roll shaft and is closely attached to the corresponding roll ring, and axial pressing force is applied to the roll rings by the nut. The invention further relates to a preparation method of the above composite roll. The preparation method comprises the following steps that A, the roll rings are arranged on the roll shaft in the sleeving manner, and the roll rings and the roll shaft are in clearance fit; B, the nuts are screwed in and mounted on one side of the roll shaft, and the nuts are attached to the roll rings in the axial direction; C, axial pressure is applied to the end faces of the roll rings, the roll rings can move in the axial direction, and the distance between each nut and the corresponding roll ring is increased; D, each nut is rotated to move towards the corresponding roll ring and is closely attached to the corresponding roll ring; E, the axial pressure is removed; and F, the nuts apply the axial pressing force to the end faces of the roll rings, and the roll rings are fixed to the roll shaft. The rolling torque is transmitted.

Description

technical field [0001] The invention belongs to the field of manufacturing metal rolling rolls, and relates to a roll with a composite structure used in a hot rolling mill or a cold rolling mill and a preparation method thereof, in particular to a cemented carbide composite roll for steel rolling and a manufacturing method thereof. Specifically, the present invention provides a composite roll with a unique structural design and a manufacturing method. The composite roll adopts clearance fit and end face compression to transmit torque, and the key is to use ordinary nuts for locking. The composite roll of this structure has the advantages of few accessories, simple structure, easy manufacture, high reliability, and easy disassembly. Background technique [0002] It has been nearly half a century since Canadian STELCO first tried hard alloy rolls (rings) on the world's first twist-free high-speed wire rod mill produced by Morgan Corporation of the United States in 1966, and it...

AI Technical Summary

Problems solved by technology

[0014] The hydraulic nut end face compression method with clearance fit is widely used in the field of composite rolls because it can be easily disassembled. However, the hydraulic nut has complex structure, high parts processing requirements, high cost, etc., and there are many accessories, cumbersome assembly steps and technical difficulties. Big

Especially the wedge ring that fills the gap between the hydraulic nut and the roll ring (or compression ring), the wedge-shaped protrusions on the opposite surfaces of the two paired wedge rings are small due to the small contact surface, during the long-term and continuous roll ring rolling process, due to Under the impact of rolling, once the wedge rings rotate or deform, there will be a gap between the hydraulic nut and the roll ring (or compression ring), and the hydraulic nut will exert axial compression on the roll ring (or compression ring). The force drops, the connection strength decreases or even fails

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