FI83906B - Roll unit for calenders, smoothing equipment, etc. and method for production - 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)

3 83906 A roller assembly for a calender, ironing plant or the like, having a deflection-compensated roll (2) and a roll jacket 5 (3) which is supported, e.g. hydraulically, to compensate for deflections, and a counter-roll (1), the second roll is a removable surface groove, characterized in that the surface groove is placed in a sleeve (6) surrounding the roll shell (3) of the deflection-compensated roll 10 (2), which can be detached from the roll shell (3) in the axial direction. Roller assembly according to Claim 1, characterized in that the sleeve (6) and / or the roll jacket (3) 15 is made at least in its support area from a material whose coefficient of thermal expansion is lower than that of the component carrying it. Roller assembly according to Claim 2, characterized in that the inner diameter of the sleeve (6) and / or the roll jacket (3) 20 is approximately the same as the outer diameter of the component supporting it when cold. Roller assembly according to Claim 2 or 3, characterized in that the outer diameter of the roll shell (3) is slightly smaller at room temperature than the inner diameter of the sleeve (6) and there is a possibility of heating the roll shell during use. Roller assembly according to Claim 4, characterized in that, when using the hydraulic support of the roller jacket (3), there is a control device for the pressure fluid which keeps it at a certain temperature above room temperature. Roller assembly according to Claim 5, characterized in that the control device can be changed for such a cooling operation that the temperature of the pressure fluid remains below room temperature. Roll assembly according to Claim 3, characterized in that the outer surface of the roll shell (3) presses firmly against the inner surface of the sleeve (6) at room temperature and that it is possible to cool the roll shell (3) to a temperature below room temperature when the roll is not in use. . Roller assembly according to Claim 7, characterized in that when the hydraulic support of the roll jacket (3) is used, the pressure fluid has a cooling device which cools it to a temperature lower than room temperature. Roller aggregate according to one of the preceding claims, characterized in that the wall thickness of the roll jacket (3) 10 is not sufficient when used alone and the stability required in use is achieved by supporting the sleeve (6). Roller reg regatta according to one of the preceding claims, characterized in that the wall thickness of the roll jacket (3) is less than that of the sleeve (6). Roller assembly according to Claim 9 or 10, characterized in that the wall thickness of the roll jacket (3) is 5 ... 30 mm and that of the sleeve (6) 10 ... 30 mm, so that the sum of both is 15 ... 40 mm. A roll assembly according to claim 11, characterized in that the roll shell has a wall thickness of about 8 mm and the core about 18 mm. A method of manufacturing a roll assembly according to claims 9-12, characterized in that the manufacture of the roll casing is started from a pipe having a wall thickness sufficient to guarantee the required stability in the first step; that in the first stage of work the outer circumference is brought to its nominal dimension; that a sleeve having a lower coefficient of thermal expansion of the ingredient is then inserted onto the first tube and joined to the tube by compression tightness by raising the temperature; and that the inner circumference of the first tube is then brought to its nominal dimension. A method according to claim 13, characterized in that a second tube is used for the manufacture of the sleeve, the wall strength of which is sufficient to guarantee the stability required in the first work step; that in the first work step the internal circumference is brought to its nominal dimension; that a roll jacket having a higher coefficient of thermal expansion of the ingredient is then inserted into the second tube and is bonded to the tube by compression tightening by raising the temperature; and that the outer circumference of the second tube is then brought to its nominal-5 dimension. 10