FI111185B - Composite Diaphragm Bending Compensated Roll and Method for Making a Composite Diaphragm Compensated Roll - Google Patents

Description

111185

The present invention relates to a composite diaphragm deflection compensated roll comprising a stationary roll axis provided with at least one loading element that applies a load on the inner surface of the composite nip. The invention also relates to a method for manufacturing a composite diaphragm deflection roll.

10

One problem with deflection compensated composite jacket rolls is to obtain a sufficiently long life due to the relatively poor resistance of the composite jacket to the oil pressure caused by the loading element. High oil pressure on the inner surface of the diaper may cause oil to penetrate the diaper or delaminate the structure. The composite sheath also does not withstand the mechanical contact of the loading elements in the event of failure of the lubricating film, the surface hardness of the composite sheath is not very good, so the inner surface of the sheath is susceptible to scratching and wear.

Thus, one object of the present invention is to provide an improved composite diaphragm deflection roll which eliminates or minimizes the above problems of the prior art composite diapers. To accomplish this objective, the deflection compensated roll according to the invention is characterized in that the inner surface of the composite sheath has a thin metal sheath portion; , 25 extending in the axial direction of the shell at least along the axial length defined by the loading elements.

The method according to the invention is characterized in that the method involves the use of a mold surrounded by a thin metal inner sheath portion which adopts the shape of the mold and which is laminated with a thicker outer sheath portion of the composite material, and then the sheath is removed.

2, 111185

A method according to another aspect of the invention for producing a flex compensated composite sheath roll is characterized in that the method comprises forming a composite sheath over the mold, removing the sheath from the mold and electrochemically plating the inner surface of the sheath, e.g. containing one or more of the following substances aluminum, wol-framicarbide, cobalt, chromium and nickel.

The invention will now be described in more detail with reference to the accompanying drawings in which:

Figure 1 schematically shows a prior art deflection-compensated composite diaper nip roll, Figure 2 shows a schematic partial section of a composite diaper according to the invention, and Figure 3 shows a schematic partial sectional view of a mold used in the method of the invention.

20

The prior art deflection-compensated composite diaper 1 nip roll 10 schematically illustrated in Figure 1 includes a central stationary central shaft 12 provided with loading elements 11 to be applied to the diaper 1 in the nip direction. -or glass fibers or mixtures thereof which may extend in the longitudinal and / or circumferential direction of the sheath and matrix material, which may be polymeric, ceramic or metallic. The ceramic material comprises various oxides and carbides such as, for example, Al, B, Cr, Ti, Si, Sn, W, Zn, Zr oxides and carbides or mixtures thereof, as well as various nitrides such as e.g. Bn and Si3N4.

3, 111185

Fig. 2 is an enlarged fragmentary view of a composite sheath 1 manufactured in accordance with the invention, provided with a metal coating 3 on its inner surface, which may be formed of, for example, a steel strip or sheet, wrapped around a mold 6 (Fig. 3) and welded the thicker outer layer of composite material, and then the casing, is removed from the mold 6. In Figure 2, reference numeral 4 denotes an adhesive end for securing the casing 1 to an end cover and rotatably mounted on shaft 12. Preferably, the steel strip or sheet is about 1.1 to 1.2 mm. The coating may also be an electrochemically coated coating, whereby a sheath of composite material is first made, e.g. by means of a mold, and then the inner surface of the sheath is coated with the desired metal coating. In Figure 2, reference numeral 2 denotes a polymer coating layer formed on the outer surface of the composite diaper. The electrochemical coating requires that the matrix be made electrically conductive or the surface treated with conductive paint 15.

Depending on the type of bearing, the width of the metal coating 3 should be slightly wider than the axial length L defined by the loading element (s) 11, as shown in Figure 2, or the entire sheath. The coating may be attached to the roll end structures or to the adhesive end.

.>

Claims (10)

111185 A composite diaphragm deflection roll (10) having a stationary roll shaft (12) provided with at least one loading element (11) applying a load on the inner surface of the composite diaper (1) in the direction of the nip to be formed with the counter roll. characterized in that the inner surface of the composite sheath (1) has a thin metal sheath portion (3) extending in the axial direction of the sheath (1) at least along the axial length (L) defined by the loading elements (11). 10 Deflection-compensated roll according to claim 1, characterized in that the metal sheath portion has a thickness of about 1 to 1.5 mm, preferably about 1.1 to 1.2 mm. Composite diaphragm deflection roll according to Claim 1 or 2, characterized in that a protective layer is formed on the inner surface of the metal diaphragm part, preferably of the same composite material as the outer diaphragm part. Composite diaphragm deflection roll according to one of Claims 1 to 3, characterized in that the composite diaphragm consists of a thin steel strip or sheet formed on the mold (6) as a steel diaphragm part (3) and in which the steel diaphragm part (3) is laminated. closed by a thicker outer shell portion of composite material. A method for producing a composite diaphragm deflection roll comprising a stationary roll axis (12) provided with at least one loading element (11) applying a load on the inner surface of the composite diaper (1) in the direction of the nip formed by the method. a mold (6) surrounded by a thin metal sheath portion (3) to which a thicker outer layer of composite material is laminated, and then the sheath is removed from the mold. 111185 Method according to Claim 5, characterized in that a protective layer is provided on the inner surface of the metal sheath part (3), preferably of the same composite material as the outer layer. Method according to claim 5 or 6, characterized in that the metal strip (3) used in the method has a thickness of about 1 to 1.5 mm, preferably about 1.1 to 1.2 mm. Method according to one of Claims 5 to 7, characterized in that the metal sheath section (3) is made by winding a thin steel strip over the mold (6) and joining the strip into a uniform sheath section by welding the seam between the strip edges. Method according to one of Claims 5 to 7, characterized in that the metal sheath section 15 is made of a thin sheet of steel which is bent around the mold (6) and welded to the formed seam (5) between the ends of the sheet. A method for manufacturing a composite diaphragm deflection roll comprising a stationary roll axis (12) having a load member (11) applied thereto applying a load on the composite jacket (1) * ;; inner surface in the direction of the nip formed with the counter space, characterized in that the method comprises forming a composite jacket over the mold, detaching the jacket from the mold, and coating the inner surface of the jacket with electrochemical or thermally sprayed metal coating. ); j> t.) e 111185