JPH0217697Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to an assembly type forming roll suitable for forming metal strips.

<Prior art> As a conventional assembly type forming roll, for example, the third
The one shown in the figure is known. Reference numeral 1 denotes an assembly type forming roll, and the cemented carbide roll 2 is cold-fitted into a left and right pair of split support rolls 5 as a "combination roll" with the processed surface 3 and outer circumferential surface 4 exposed. A cemented carbide fin roll 6 cold-fitted into a ring 7 is sandwiched between the cemented carbide roll 2 and the split support roll 5. The ring 7 is integrally fastened to the pair of left and right split support rolls 5 with bolts 8, and is attached to the drive shaft 9 with a key 10. The cemented carbide roll 2 is subjected to a stress F1 due to cold fitting on the inner circumferential surface 11, and further has a split support roll 5 and a fin roll 6 on the inner and outer surfaces 12 and 13 in the width direction (direction of arrow L in FIG. 3), respectively. It is connected to the drive shaft 9 by applying the tightening force of the bolt 8 via the bolt 8. This assembly type forming roll 1 is attached to a plurality of roll stands (not shown) to form a metal strip into a predetermined shape.

Note that 14 is a nut for tightening the bolt 8.

<Problems with the prior art> However, in such a conventional assembly type forming roll, the cemented carbide roll 2 has an inner peripheral surface 1
1 is cold-fitted to the split support roll 5, it is inevitable that a gap of, for example, about 0.01 to 0.003 mm will be formed on the outer surface 12. Therefore, when forming metal strips, the cemented carbide roll 2
When the roll was subjected to excessive processing stress, the cemented carbide roll 2 had a weak bonding strength by the gap, and was susceptible to damage due to misalignment. Therefore, it is conceivable to increase the width dimension in order to improve the cold fitting bond strength with the inner circumferential surface 11 of the cemented carbide roll 2, but since the cemented carbide roll 2 is a very expensive material, it is easy to make it thicker. The reality was that it was not allowed. For this reason, there has been a desire for an assembly type forming roll using a low-cost cemented carbide roll that is strong enough to withstand the processing stress of metal strips.

<Means for solving the problems> Means for solving the problems described above will be explained below using FIG. 1 corresponding to the embodiment.

In this invention, as an assembly type forming roll 20, a pair of left and right cemented carbide rolls 22 are each cold-fitted into a receiving sleeve 24.

Similarly, the left and right pair of combination rolls 21 are each provided with a pressing flange portion 31 protruding from the opposing peripheral edge 30, and in a state where the outer peripheral surface 32 of the cemented carbide roll 22 is covered with the flange portion 31, the cemented carbide roll 22 is They are each shrink-fitted to the roll 22 and connected to the receiving sleeve 24 by bolts 33, respectively. Then, shrinkage stress F2 (see FIG. 1) is applied to the cemented carbide roll 22 at the flange portion 31.

<Effect> Next, the action will be explained.

When assembling the assembly type forming rolls 20, first the pair of left and right cemented carbide rolls 22 are cold-fitted into the pair of left and right receiving sleeves 24, and then the pair of left and right combined rolls 21 are assembled with their protruding flange portions 31. The coated outer circumferential surfaces 32 of the cemented carbide rolls 22 are each shrink-fitted onto the cemented carbide rolls 22, and simultaneously connected to the receiving sleeves 24 using bolts 33 and attached to the drive shaft 25. As a result, shrinkage stress F at the flange portion 31 for the cemented carbide roll 22
2 is given. Therefore, when an excessive processing stress of the metal strip is applied to the cemented carbide roll 22 during the forming process of the metal strip, the cemented carbide roll 22 receives stress F1 due to cold fitting from the receiving sleeve 24, and is further assembled. Shrinkage stress F2 is received from the flange portion 31 of the mating roll 21, and the bolt 33 connects the receiving sleeve 24 to the mating roll 2.
1 is connected, so to speak, the cemented carbide roll 22 is sandwiched between the flange portion 31 and the receiving sleeve 24, and the cemented carbide roll 2
2, the high stresses F1 and F2 can be constantly maintained, so compared to conventional cemented carbide rolls, which are mainly joined only by cold fitting stress on the inner peripheral surface, the joint strength is higher. The high strength can be obtained at any time and is strong enough to cope with the excessive processing stress of the metal strip. Therefore, the expensive cemented carbide roll 22 can be prevented from being damaged due to loosening of the joint strength. As the bonding strength of the cemented carbide roll 22 is improved, the widthwise thickness of the cemented carbide roll 22 can be reduced, and material costs can be expected to be reduced.

<Embodiment> A first embodiment of this invention will be described below with reference to FIG. Incidentally, the same parts as in the prior art are denoted by the same reference numerals, and redundant explanation will be omitted.

Reference numeral 20 denotes an assembly type forming roll, which is mainly composed of a pair of left and right combination rolls 21, a pair of left and right cemented carbide rolls 22, and a drive shaft 25.
In addition, in the following explanation, the "pair of left and right" parts are the same shape and groove shape, so the pair of left and right will be explained only when necessary. Otherwise, only one side will be explained and the same reference numerals are used in the figures. I'll just show you.
The cemented carbide roll 22 is cold-fitted into the receiving sleeve 24. In the illustrated example, the cemented carbide roll 22 is divided into a pair of left and right parts, and a drive roll 27 secured to a drive shaft 25 by a key 26 is interposed between the cemented carbide rolls 22 . The pair of left and right receiving sleeves 24 are fitted in advance to the pair of left and right rings 28 via the tapered roller bearings 29 and oil seals 36, and the pair of left and right cemented carbide rolls 22 are cold-fitted into the receiving sleeves 24. ing.

The pair of left and right combination rolls 21 each have a flange portion 31 protruding from the opposing peripheral edge 30, and the flange portion 31 covers the outer peripheral surface 32 of the cemented carbide roll 22, and the cemented carbide roll 22 is baked. At the same time as being fitted, it is connected to the receiving sleeve 24 with a bolt 33. Then, it is fitted to the drive shaft 25 via the tapered roller bearing 29 and ring 28. Therefore, with respect to the drive roll 27, the combination roll 21, the cemented carbide roll 22, and the receiving sleeve 24 are so-called "free rolls".
will be formed. By the way, with the above combination, the cemented carbide roll 22 is joined to the outer circumferential surface 32 by shrinkage stress F2 due to shrink fitting from the flange portion 31, and further to the inner circumferential surface 34 by receiving stress F2 due to cold fitting from the receiving sleeve 24. This means that it has been done. Further, by connecting the receiving sleeve 24 and the combination roll 21 with the bolts 33, stresses F1 and F2 are constantly applied to the cemented carbide roll 22.

When forming a metal strip, even if excessive processing stress of the metal strip is applied to the cemented carbide roll 22,
The cemented carbide roll 22 receives stress F1 from the receiving sleeve 24 due to cold fitting, and also receives the stress F1 from the flange portion 3.
1, and since the receiving sleeve 24 and the combination roll 21 are connected by the bolts 33, the cemented carbide roll 22 is sandwiched between the flange portion 31 and the receiving sleeve 24, and the stress F1, F2 is The joint strength of the metal strip is always higher than that of conventional cemented carbide rolls, which were mainly joined only by the cold fitting stress F1 on the inner peripheral surface 34. Can fully cope with excessive machining stress. Therefore, it is possible to prevent the expensive cemented carbide roll 22 from being damaged due to loosening of the bonding strength, and furthermore, the thickness dimension in the width direction of the cemented carbide roll 2 can be reduced due to the improved bonding strength of the cemented carbide roll 22. This means that material costs can be expected to be reduced.

FIG. 2 shows a second embodiment. In this second embodiment, the cemented carbide roll 2 is connected to the drive shaft 25.
2 and the combination roll 21 can be fitted through a long key 37 instead of the conical bearing 29. Thus, like the drive roll 27, the combination roll 2, the cemented carbide roll 22 and the receiving sleeve 24 form a "drive roll". Other structures and functions are the same as in the previous embodiment, and common parts in the drawings are designated by the same reference numerals, and redundant explanation will be omitted.

<Effects> Since the assembly type forming roll according to this invention has the contents as explained above, even if excessive processing stress of the metal strip is applied to the cemented carbide roll during the forming process of the metal strip, the Compared to conventional rolls that are joined only by cold fitting stress on the inner circumferential surface, alloy rolls receive shrinkage stress on the outer circumferential surface from the flange of the combined roll, and these stresses can be maintained constantly. As the combination roll and the receiving sleeve 24 are bolted together to sandwich the cemented carbide roll, the joint strength is sufficient to cope with the excessive processing stress of the metal strip at any time. This has the effect of preventing damage caused by loosening of the joint strength. Furthermore, the improved bonding strength of the cemented carbide rolls reduces the widthwise thickness of the cemented carbide rolls, which can be expected to reduce material costs. Since the flange portion covers the outer circumferential surface of the cemented carbide roll, an additional effect can be obtained in that the outer circumferential surface of the cemented carbide roll is protected and damage caused by contact with other parts can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a first embodiment of an assembly type forming roll according to this invention, FIG. 2 is a partial sectional view corresponding to FIG. 1 showing a second embodiment of this invention, and FIG. FIG. 3 is a partial cross-sectional view of a conventional assembly type forming roll. 1,20... Assembly type forming roll, 2,22...
Cemented carbide roll, 4, 32... outer peripheral surface, 9, 25
... Drive shaft, 21 ... Combination roll, 2
4... Receiving sleeve, 30... Periphery, 31... Flange portion, 33... Bolt, F2... Shrinkage stress.

Claims (1)

[Scope of Claim for Utility Model Registration] In an assembled forming roll in which a pair of left and right cemented carbide rolls are also assembled between a pair of left and right combination rolls and attached to a drive shaft, the pair of left and right cemented carbide rolls are The pair of left and right combination rolls each have a pressing flange portion protruding from the opposing periphery, and the outer peripheral surface of the cemented carbide roll is covered with this flange portion. An assembly type forming roll, characterized in that the rolls are each shrink-fitted to the cemented carbide roll, each bolted to the receiving sleeve, and shrinkage stress is applied to the cemented carbide roll at a flange portion.