FI120004B - Method of making a roll of a fiber web machine such as a paper or board machine and a roll of a fiber web machine such as a paper or board machine - Google Patents

Description

The present invention relates to a process for manufacturing a roll of a fiber web machine such as a paper or board machine, such as a paper or board machine, and a roll of a fiber web machine such as a paper or board machine.

The invention also relates to a roll of a fiber web machine, such as a paper or board machine, according to the preamble of claim 7.

U.S. Patent 105573 (corresponding to U.S. Patent 5,996,244) discloses a roll of a papermaking machine, particularly a paper drying apparatus, wherein the roll of the paper drying apparatus comprises an axis on which the roll is adapted to rotate and a surface structure connected to the shaft by plugs or the like. the open structure of the surface structure is more than 10%, and the surface structure of the roll is slit open so that when the roll is rotated, an air-absorbing effect is produced on the roll, thereby creating an air flow through the roll. According to one example disclosed in the patent, the surface structure of the roll is formed by spaced annular plates which are connected to the support members by means of support bars connected to the axis of the roll 20 and wherein the ring body may be formed by a disc comprising a lightened portion.

FI Patent Application 20031461, in turn, discloses a roll of a paper or board machine comprising a roller body or center shaft bearing at its ends and a grooved surface structure or a roller body machined with a paper or board machine and a paper or board machine roll in connection with the drying wire or dryer wire and having a contact between the roll surface structure and the central axis so as to form a substantially closed structure. The depth of the groove of the roll grooved surface or the grooved surface of the roll machined to the body is 10-155 mm, whereby utilizing the flow patterns of the surface of the roll and / or the wire / paper or board web, 2 area of the roller circuit. One of the possibilities for making a roll groove on the surface of the frame roll is the disc milling and / or turning. Further, it is known from this application to perform 5 grooves by welding, gluing or mechanically locking separate jew disks, which are metal, polymer or a combination of several materials, on the surface of the frame drum, whereby the upstream or otherwise outermost part is very wear resistant. The application also mentions the implementation of grooving in the so-called. Using G-strip technology, whereby the strip is pulled directly over the smooth frame roll 10 or in special mounting grooves on the surface of the frame roll. A specific embodiment is mentioned as an embodiment in which a G-band is pulled onto an old or new roll body by means of a support band. One example is the formation of an open surface roll structure of a roll from heel portions comprising a metal portion forming a heel body and a filler portion, such as plastic or metal-based material, forming a second side wall of the groove. The heel parts of the surface structure are attached with a support band to the roll frame or center shaft. In another example described in the application, the roll diameter is, for example, 1500 mm. The 1300 mm diameter frame structure, which does not have to be the actual frame roll but resembles a support structure, is fitted with, for example, 20 disc welded disc discs. The disc discs are 100 mm high and 6 mm thick. There is a 7 mm wide open slot between the disc discs. In a third example, a rigid arrangement is described in which discrete disc units are joined to each other or to the center axis using frictional or contoured joints, for example disc discs of different sizes are connected to the roll body e.g. , which contains a structure of disks of different sizes, which are then joined to each other by, for example, a form-fitting joint.

From the above-mentioned prior art manufacturing methods for making a groove roll 30, material removal processes, such as making a surface structure by turning or milling, have proved ineffective because manufacturing is a retardant and material loss is high.

An object of the invention is to provide a method for manufacturing a groove roll of a fiber web machine and a groove roll of a fiber web machine in which the drawbacks of the known rolls described above are eliminated or at least minimized.

Another object of the invention is to provide a method for manufacturing a groove roll of a fiber web machine which is cost effective and material saving.

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In order to achieve the above and later objects, the process for producing a fiber web machine roll according to the invention is essentially characterized in what is stated in the characterizing part of claim 1.

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The fiber web machine roll according to the invention, in turn, is essentially characterized by what is set forth in the characterizing part of claim 7.

In this specification, the term groove roll refers to a roll of the type described in FI patent application 20 20031461, having a grooved surface structure extending around the periphery of a deep frame formed by a deep body, the grooves being substantially perpendicular to the longitudinal direction of the roll.

According to the invention, separate rims of at least two interconnected, circumferential hoop members are preferably secured to the surface of the roll frame by welding at a distance from one another, preferably by means of a locking joint, preferably a form-locking joint, preferably a jigsaw. In the form-locked joint, the parts to be joined together comprise suitable lockable forms, for example male / female.

According to the invention, the roll body or body shell is preferably manufactured in a modular structure, for example by welding, preferably laser welding, the body pieces in succession in the longitudinal direction of the roll body.

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In the manufacturing process of the invention, laser welding is preferably used as the welding process, preferably without additive. A special advantage of laser welding is its low heat input, which minimizes deformation during manufacturing.

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The primary advantages of the manufacturing process according to the invention are its efficiency and simplicity, since the roll production is fast and material-saving.

According to a preferred embodiment of the invention, the groove roll roller body, i.e. the body shell 15, is made of a thin sheet of metal, for example steel, with a maximum thickness of 10 mm. The cut metal sheet, preferably laser cut, is bent to a cylindrical shape and the joint is welded, preferably by laser welding. The body sheath is made by joining at least two, preferably several, cylinders in series by welding, preferably by laser welding. The grooves in the roll sheath 20 are made by securing at intervals metal struts between the frame sheath having a groove between them, which, for ease of installation and cost-effective use of the material, are assembled from at least two different parts. a joint surface, for example a puzzle joint, the rims formed from Van-25 neo-parts are attached to the body shell, preferably by laser welding. Preferably, during the attachment step, the strap is supported so that it cannot bend due to heat, for example welding heat, or deformation of the material. The thickness of the rims, the distance between them, i.e. the pitch, the inner diameter, and the height are determined by the desired grooveage geometry such that the overall diameter, groove depth, groove width, and heel width are desired for roll operation.

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According to a further feature of the invention, the rims are made so that they are substantially hollow on the inside. The surface structure of the rims is preferably made of steel and has a hollow inner portion of air or other substantially lighter material than steel, preferably other solid material. The hollow core is preferably stiffened on the inside of the rim by means of stiffeners, preferably at least two, which are provided in the hollow space and which, for example, have a Z profile.

The groove roll produced by the manufacturing method according to the invention is suitable for use in a fiber web machine in a variety of positions, such as, for example, a drying section as a rotating or support roll or a paper guide roll, press section or former part as a dewatering roll.

The roll of a fiber web machine according to the invention, such as a paper or board machine, is a groove roll and comprises a roll body or frame shell and a grooved surface structure arranged around it. The groove structure comprises separate rims spaced apart at a distance from the periphery and comprising at least two interconnected circumferential rim portions, the rims being welded to the surface of the roll body or frame shell. In accordance with a preferred embodiment of the invention, the hoop members are connected to each other by a locking connection, preferably a form-locking connection, for example a jigsaw puzzle connection. According to a preferred embodiment of the invention, the groove roll casing body is modular and comprises at least two casing body pieces which are connected in series in the longitudinal direction of the roll body. According to a further feature of the invention, the rims are hollow on the inside and the hollow inner portion of the rim comprises 25 stiffeners placed inside the rim, in a hollow space.

In the following, the invention will be described in more detail with reference to the figures in the accompanying drawings, in which details the invention is not intended to be narrowly limited.

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Fig. 1 schematically illustrates an example of a rim to be used around the groove roll casing for use in the manufacturing process of the invention.

Figures 2A-2D schematically illustrate some embodiments of the manufacturing process of the invention.

Figures 3A-3F schematically illustrate further embodiments of the manufacturing process of the invention.

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In the following figures, the same reference numerals are used for like parts, unless otherwise stated.

In accordance with the embodiment shown in Figs. 1, in the process of the invention 15, metal straps 10 are provided at intervals to facilitate the installation and cost-effective use of the material. from different parts 10A, 10B, 10C. The rim portions 10A, 10B, 10C are cut, for example by laser cutting, from a metal sheet such that a locking joint surface, e.g. a jig connection 11A, 11B, 11C, is cut on the joint surface between the rim portions 10A, 10B, 10C. The rims 10 formed from the rim portions 10A, 10B, 10C are secured to the body shell, preferably by laser welding. The reference mark b denotes the height of the rim from the outer diameter D of the casing. The 25 partial enlargements S in the figure show a jigsaw connection 1Aa between the rim portions 10A and 10B.

Figures 2A-2D show some examples of the production of rim 10 by the manufacturing process of the invention. In Figure 2A, hollow rims 10 are attached to the groove roll body sheath 9. The rim 10 comprises an outer peripheral strip 21, 30 cheekbones 22 and an inner peripheral strip 23. In the manufacture, the inner peripheral strips 23 are first secured to the body shell 9 and to each other. Thereafter, in Fig. 7 2B, the cheek membrane plates 22 are secured to the inner circumferential band 23 by an adapter and secured, if necessary, by a point 1 azer weld. Finally, the outer peripheral band 21 is fastened by tightening the cheek plates 22 to the fitting grooves in the outer peripheral band 21, Fig. 2C. According to Figure 2D, the cheek plates 22 can be made by welding 5 of the segment segments 22A, 22B to be joined. The cheekbones may also be clamped to the outer circumferential band 21 in a groove groove so that the segments do not always have to be welded together. According to these examples, a light groove roll is obtained which is advantageous at high machine speeds. The hollow rim structure is easily obtainable and laser welding and fitting grooves ensure the structure remains in place. Preferably, profile strips which bend to the desired radius can be used as the inner ring 10 as the ribbon 23 and the outer peripheral ribbon 21. Preferably, the cheek plates 22 are made of thin films or sheets.

Figures 3A-3F show some examples of the production of rim 10 by the manufacturing process of the invention. According to Figure 3A, the body shell 9 is made of at least two shell parts 9A, 9B and their junctions are designated by reference numerals 12A, 12B, and the rim 10 is also made of at least two rim parts 10A, 10B which are joined to each other by connections 11A, 11B. Joints 12A, 12B welded with screws or wedges and blindfolds. Figure 3B shows a honeycomb sheath 9 on whose outer surface the rim 10 is secured. Fig. 3C illustrates various alternatives for the connections 12B, 11B between the shell portions 9A, 9B of the body shell 9 and the rim portions 10A, 10B of the rim 10. The joints have parking projections on the hoops and recesses in the diaper sections. Fig. 3D shows a groove roll end flange 13 disposed inside the body shell 9. The end flange 13 25 is provided with threaded holes 14. The body flange 9 is provided with rims 10 to provide a groove structure. Figure 3E illustrates various alternatives to the circumferential structure of the groove roll provided by the wheels 10. Figure 3F, in turn, illustrates alternatives for attaching the straps 10 by welding. The welding H can be performed from the outside or from the inside when the sheath 9 and the hoops 10 are made as symmetrical halves or segments.

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The invention has been described above with reference only to some preferred embodiments thereof, the details of which, however, are not to be construed in any way narrowly limited.

Claims (12)

9 A method of manufacturing a roll of a fiber web machine, such as a paper or board machine, which is a groove roll and comprises a roll body or frame casing (9) and a grooved surface structure adapted around it, wherein the groove structure is formed (10), which are secured by welding to the surface of a roll frame or frame shell (9), characterized in that the manufacturing process is performed by joining at least two circumferential rim portions (10A, 1010B, 10C) which are joined to each other by a form locking joint (10). 1 IA, 1 IB, 11C). A manufacturing method according to claim 1, characterized in that the strut members (10A, 10B, 10C) are connected to one another by a jigsaw puzzle joint (11A, 11B, 11C). A manufacturing method according to claim 1 or 2, characterized in that the groove roll body shell (9) is manufactured in a modular manner by joining at least two successive body members forming the frame shell (9) in the longitudinal direction of the roll body. A manufacturing method according to claim 3, characterized in that in the manufacturing method the body members are joined together by welding. Manufacturing method according to one of Claims 1 to 4, characterized in that the welding is carried out by laser welding. Production method according to one of Claims 1 to 5, characterized in that the production process comprises the production of hoops (10) from the inside and that the hollow inner part of the rim (10) is stiffened by placing stiffeners inside the hollow space. 10 A roll of a fibrous web machine, such as a paper or board machine, which roll is a groove roll and comprises a roll body or frame shell (9) and a grooved surface structure arranged around it, the groove structure comprising separate rims spaced apart on the outer periphery of the shell the rims (10) being welded to the surface of the roll frame or frame (9), characterized in that the rims (10) comprise at least two interconnected circumferential rim portions (10A, 10B, 10C) which are connected to one another by a form locking joint (1A), 1 IB, 11C). Roll according to Claim 7, characterized in that the strut members (10A, 10B, 1010C) are connected to one another by a jigsaw puzzle connection. Roll according to Claim 7 or 8, characterized in that the groove roll casing (9) is of modular construction and that the casing casing (9) comprises at least two casing pieces which are connected in succession in the longitudinal direction of the roll casing. 15 Roll according to Claim 9, characterized in that the body members are joined together by welding. Roll according to Claim 9 or 10, characterized in that the body members 20 are joined together by laser welding. Roll according to one of Claims 7 to 11, characterized in that the rims (10) are hollow on the inside and that the hollow inner part of the rim (10) comprises stiffeners located inside the hollow space. 25 11