RU2434697C2 - Method of producing build-up roll - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: proposed method comprises fitting roll sleeve with clearance on shaft with collar between spacers that are tightened by fasteners. Axial and radial displacement is eliminated by assembling said roll sleeve from inner and outer parts. Note here that sleeve inner part is cut along generating line and fitted freely said shaft while outer part is assembled from replaceable rings to be fitted on inner part outer cylindrical surface, and, thereafter, radial interference between said inner and outer parts is created by aforesaid fasteners. Note that said replaceable rings are additionally secured.

EFFECT: reliable joint, simple fabrication, repair and replacement.

3 dwg

Description

The invention relates to methods for manufacturing bandaged rolls and can be used in the manufacture of bandaged rolls.

A known method of manufacturing a composite roll, including the installation of a bandage with a clearance on the shaft with a shoulder between the spacer sleeves, which are pulled together by fasteners to create an interference fit (1).

The disadvantage of this method is the difficulty of manufacturing and assembling a large number of elements.

A known method of manufacturing a composite roll, including installing a bandage with a gap on the shaft with a shoulder between spacer sleeves, which are tightened with fasteners to fix on the shaft and create an interference fit (2).

The disadvantages of the method are the complexity of manufacturing, low reliability of securing the bandage from axial displacement, the complexity of the assembly and repair, requiring thermal and press equipment.

Another disadvantage is the need to replace the entire bandage as it wears out with a large residual thickness due to loss of stiffness and the risk of fracture.

The objective of the invention is to increase the reliability of the joints axial and radial shear, simplifying the manufacture, assembly and repair, reducing metal loss when replacing a worn band.

The problem is solved in that in the method of manufacturing a composite roll, comprising installing a bandage with a clearance on the shaft with a shoulder between spacer sleeves, which are pulled together with fasteners to fix on the shaft and create an interference fit, the bandage is assembled from the inner and outer parts, while the inner part of the bandage cut along the generatrix and freely put on the shaft, and the outer part of the bandage is assembled from interchangeable rings, which are placed on the outer cylindrical surface of the inner part, after which they create a radial tension between the inner and outer band portions by fasteners and additionally fasten removable ring.

Significant coinciding features of the invention and the prototype is that the bandage is fixed to the shaft by converging conical spacer sleeves with fasteners that create a radial tightness. Salient features of the proposed method from the prototype is that the bandage is assembled from the inner bearing part of the bandage, which is cut along the generatrix, and the outer part assembled in the form of a set of interchangeable rings, freely worn and compensating for wear.

Another distinctive feature is that the radial interference between the inner cut part of the brace and a set of interchangeable rings of the outer part is created by tightening the fasteners of the spacer sleeves due to the expansion of the inner split part of the brace, which is necessary for their centering.

Another additional significant difference is that the axial radial fixation of the outer part of the bandage assembled from interchangeable rings on the split inner part of the bandage is created by securing the interchangeable rings with conical threaded pins.

Replaceable wear compensating rings that are installed without interference may be heat treated.

The combination of matching and distinguishing features of the invention allows to simplify the assembly - disassembly of the composite roll, reduce the need for large radial tightness, reduce the load on the split bandage, providing guaranteed strength and stiffness regardless of the degree of wear of a set of wear-compensating interchangeable rings. During operation of the composite roll, wear of the changeable rings is uneven. As a result of affordable and easy disassembly and assembly, interchangeable rings can be selectively swapped or rearranged. There is no need to completely disassemble the bandage during repairs of the composite roll, which boils down only to removing the interference by unscrewing the fasteners without disassembling them. The residual thickness of the worn out set of interchangeable rings is significantly reduced, since they carry a significantly lower radial interference value and do not determine the strength and stiffness of the roll. Used pipes, bandages of railway and tram wheels, etc. can be used as a set of interchangeable rings. For the manufacture of rings, powerful rolling equipment is not required. The assembly of a composite roll does not require thermal and press equipment. Repair is possible at the place of operation of the composite roll with partial dismantling of one of the supports.

Figure 1 shows an axial section of a composite roll made by the proposed method, figure 2 is a view aa on the end of the roll, figure 3 is a section bB.

The composite roll consists of a shaft 1 with a collar 2, a mechanism for fastening the bandage on the shaft in the form of spacer sleeves 3, keys 4, fasteners 5, a detachable bandage 6, consisting of an inner part 7 made in the form of a tubular element with a slot “C” on a cylindrical forming, and the outer part 8, consisting of a set of interchangeable rings 9, which are fixed by threaded pins 10.

The assembly of the composite roll is as follows

A detachable bandage 6 is sequentially put on the shaft 1 with a gap, which is assembled from the inner part 7, made in the form of a tubular element with a longitudinal slot “C” along the cylindrical generatrix, and the outer part 8 from interchangeable rings that are assembled and placed on the outer cylindrical surface of the inner parts 7 of the bandage 6. Install two spacer sleeves 3 on the shaft 1 on both sides of the shoulder 2, on the conical end surfaces of which the conical end surfaces of the tubular element - the inner part 7 of the detachable gang are supported Ms. 6.

Then tighten the spacer sleeves 3 mounted on both sides of the collar 2 by fasteners 5. In this case, the tubular element of the inner part 7 of the retainer 6 is unclenched due to the presence of a longitudinal slot “C” along the cylindrical generatrix, creating an interference fit between the inner surface of the set of interchangeable rings 9 the outer part 8 of the bandage 6 and the outer surface of the tubular element - the inner part 7 of the bandage 6, which prevents the scrolling of the bandage during operation of the composite roll.

Fasten additionally interchangeable rings 9 of the outer part 8 of the bandage 6 with conical pins 10.

The created interference fit of the set of interchangeable rings of the outer part of the bandage along the cylindrical surface of the tubular element of the inner part along almost the entire length of the generatrix guarantees the most complete wear of the set of interchangeable rings of the outer part of the bandage without breaking the tubular element of the inner part, which increases its service life.

Cutting the tubular element of the inner part of the bandage with a longitudinal slot and securing the replaceable rings of the outer part of the bandage with pins allows, when assembling the roll, to obtain a guaranteed minimum tightness and joint strength to the maximum wear of the outer part of the bandage, consisting of interchangeable rings, without the risk of their destruction, to increase operational reliability, use metal by reducing the residual thickness of interchangeable rings that do not bear the additional load associated with providing rigidity and strength.

Assembly and maintainability of the roll is greatly simplified, which is ensured by unfastening the fasteners, due to the reverse deformation of the inner part of the bandage, the interference between all elements of the composite roll is eliminated. Worn out rings of the outer part of the composite band are freely replaced with new ones without disassembling other elements of the composite roll.

The invention thus provides an increase in the rigidity and strength of the roll, eliminates the loss of metal of a worn out bandage of large residual thickness, increases the maintainability of the roll due to the quick and easy replacement of a set of interchangeable rings worn to the limit - the outer part of the composite bandage.

Information sources

1. RF patent No. 2218218 dated October 12, 2003, IPC B21 B27 / 03.

2. RF patent No. 2093264 dated 10.20.1997, IPC V02C4 / 30.

Claims (1)

A method of manufacturing a composite roll, including installing a bandage with a clearance on the shaft with a collar between spacer sleeves that are fastened together with fasteners to fix on the shaft and create an interference fit, characterized in that the bandage is assembled from the inner and outer parts, while the inner part of the bandage is cut along the generatrix and freely put on the shaft, and the outer part of the bandage is assembled from interchangeable rings, which are placed on the outer cylindrical surface of the inner part, after which the fasteners create a radial tightness between the inner and outer parts of the bandage and additionally fix interchangeable rings.

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