FI83906C - VALSAGGREGAT FOER KALANDER, STRYKINRAETTNING MM. OCH METHOD FOR TILLVERKNING AV DETTA. - Google Patents

Description

83906

A roller assembly for a calender, ironing plant, etc., and a method of making the same

The invention relates to a rolling mill for calenders, ironing plants and the like having the features mentioned in the first part of claim 1.

Such a roller assembly known from GB-A-888 924 is complicated by the replacement of a surface-grooved, cylindrical body. The use of different surface grooves becomes expensive, especially in the case of a deflection-compensated roller.

The prior art patents US-A-3747181, DE-U-8518933, DE 673917 and FI 50364 also do not make the change from surface to simple.

The object of the invention is to further develop a roll assembly according to the features mentioned in the first part of claim 1, so that the change of the surface groove is simplified and at the same time the cost of the surface groove roll is reduced.

According to the invention, this is achieved by a solution according to the features mentioned in the characterizing part of claim 1. Preferred embodiments of such a roll assembly are described in subclaims 1-12 and a preferred method of making such a roll assembly is described in subclaims 13-14.

The invention will now be described with reference to the accompanying drawings, in which: Figure 1 shows: an embodiment of a roll assembly according to the invention; and Figure 2 shows: a front view of a calender with a roll changer.

The roll assembly shown comprises a counter-roll 1, which is designed as a full-roll or a thick-walled hollow roll. The counter roll 1 may have bores for the heating system 35 which are not shown in the figure.

The roll assembly further comprises a hydraulically deflection-compensated roll 2 with roll rollers 3 supported on a fixed support 4, e.g. 83906, e.g. hydraulically to compensate for deflections. Exemplary support 5 is not presented in detail. Such subsidies are known from many implementations. They have, for example, a plurality of axially arranged elements which support the roller envelope from the inside. In other embodiments, the inside of the roll shell 3 is hydraulically supported by pressure, whereby the expansion of the roll shell causes the deflection to be compensated.

Around the roll jacket 3 there is a sleeve 6, the outer surface of which is provided with a surface groove. Since both the roll jacket 3 and the sleeve 6 are relatively thin-walled, the sleeve 6 is also subjected to corresponding deflection compensation.

In Fig. 3, the roller assembly is shown in a calender 15, in which only two opposite frame walls 7 are visible. The left roller 1 is mounted on the frame walls 7 as shown.

Below the counter-roller 1 there is a deflection-compensated roller 2, which is also mounted on the frame walls, but still on 20 bearing plates which are adjustable relative to the bearings of the counter-roller 1. To change the surface groove, one of the bearing plates of the hydraulically deflection compensated counter-roller 2 is removed and the roller jacket 3 or sleeve 6 is pulled axially, so that the roller jacket 3 25 or sleeve 6 moves on support rollers 8. A new roller sleeve may be made of a material having a coefficient of thermal expansion greater than that of the sleeve 6, 30 wherein the outer diameter of the sheath 3 is approximately equal to the inner diameter of the sleeve 6 when cold. As a result, the sleeve 6 can be easily pulled out or pushed into place in the cold, while the thermal stress generated at the operating temperature locks the sleeve 6 in the roll jacket 3 with a compression tightness 35.

The roll jacket can be made of, for example, aluminum or the sleeve of, for example, steel.

Claims (14)

1. Roll assembly for calender, ironing etc. with bend-compensated roller (2) and roller sheath (3), hydraulically supported for compensating the deflections, and counter-roller (1), one roller, for example the bending-compensated roller (2), provided with removable surface grooving characterized by: that the surface groove is provided in a sleeve (6) which surrounds the roller sheath (3) of the bending-compensated roller (2) and which can be detached from the roller sheath (3) in the direction of the shaft. 2. A roller assembly according to claim 1, characterized in that the sleeve (6) and / or the roller sheath (3) have at least, as far as the support areas are made of material, whose coefficient of thermal expansion is less than that of the supporting structural part. Rolling assembly according to claim 2, characterized in that the inner diameter of the sleeve (6) and / or the roll casing (3) in the cold state is approximately the same as the outer diameter of the supporting structural part. 4. Roll assembly according to claim 2 or 3, characterized in that the outer diameter of the roller sheath (3) at room temperature is slightly smaller than the inner diameter of the sleeve (6) and that it is possible to heat the roller sheath during use. 5. A roller assembly according to claim 4, characterized in that, when using hydraulic support for the roller sheath (3), there is a control device for the hydraulic fluid which pours it at a predetermined temperature which is higher than the room temperature. 6. A roller assembly according to claim 5, characterized in that the control device can be set for cooling, so that the temperature of the hydraulic fluid is below room temperature. 7. A roller assembly according to claim 3, characterized in that the outer surface of the roller sheath (3) is pressed tightly at the internal surface of the sleeve (6) and that it is possible to cool the roller sheath (3) to a temperature lower than the room temperature. when the roller is not used. Rolling assembly according to claim 7, characterized in that, when using hydraulic support for the roll casing (3), there is a control device for the hydraulic fluid which cools it down to a temperature lower than the room temperature. Rolling assembly according to any of the above claims, characterized in that the thickness of the roll casing (3) is not sufficiently alone and that the required stability is obtained by supporting the sleeve (6). 10. A roller assembly as claimed in any of the above claims, characterized in that the wall thickness of the roller sheath (3) is less than that of the sleeve (6). 11. Roll assembly according to claims 9 or 10, characterized in that the thickness of the roll casing (3) is 5 ... 30 mm and the sleeve (6) 10 ... 30 mm, giving the sum 15 ... 40 mm. 12. Roll assembly according to claim 11, characterized in that the roll thickness of the roll casing is about 8 mm and the sleeve about 18 mm. Method for manufacturing roll assemblies according to claims 9-12, characterized in that the manufacture of the roll casing is started with a tube whose thickness of material is sufficient to guarantee the required stability in the first working phase; that the outer perimeter during the first working phase upgrades its nominal dimension; that a sleeve, whose material has a lower coefficient of thermal expansion, is then pushed outside the first tube and connected to the tube by press fit by raising the temperature; and then the inner circumference of the first tube reaches its nominal dimension. Method according to Claim 13, characterized in that another tube with a sufficient thickness of material to ensure the required stability during the first working phase is used for the manufacture of the sleeve; that the inner circumference reaches its nominal dimension during the first working phase; that a roller sheath, the material of which has a higher coefficient of thermal expansion, is then pushed into the second tube and connected to the tube with press fit by raising the temperature; and then the outer circumference of the second tube reaches its nominal dimension.