KR20040004104A - Rolling mill roll assembly - Google Patents

Abstract

PURPOSE: A rolling mill roll assembly is provided to make a roll properly placed in the center of a roll shaft and to prevent damage of an outer roll flank due to a torque transmission retainer screw. CONSTITUTION: A rolling mill roll assembly(10) comprises a support shaft(12) having a tapered section(14) leading from an abutment to an end section; a ring-shaped roll(26) having inner and outer flanks(28,30) and a cylindrical bore(34); a tapered sleeve(36) inserted between the tapered section of the shaft and the cylindrical bore of the roll; a load ring(40) rotatably fixed with respect to and axially movable on the end section of the shaft; a resilient unit interposed between the load ring and the sleeve for maintaining a gap between the load ring and the outer flank of the roll; a roll retainer(50) mounted on the end section of the shaft; and bolt members threaded in through bores in the roll retainer.

Description

Rolling Mill Roll Assembly {ROLLING MILL ROLL ASSEMBLY}

The present invention relates to a rolling mill, in particular a so-called "overhung" type improvement in which a ring-shaped roll disc with a cylindrical hole is centered in a tapered shaft section by a tapered sleeve that is tightly wedged therebetween. To a roll assembly.

As disclosed in US Pat. No. 5,934,131 (shen, shen), in known roll assemblies of the type described above, the tapered sleeve is pressed to an operative wedge engagement position by a rigid circular retainer. The retainer is rotatably fixed to the shaft and is advanced relative to the sleeve by tightening a nut that is screwed onto the end of the shaft. The screw conveyed by the retainer is then tightened against the outer flank of the roll to press the inner flank of the roll against the shaft shoulder. Thus, when tightened, the screw provides a first means for transmitting torque from the roll shaft of the roll.

There are several disadvantages to such a device. First, the tapered sleeve cannot be fully wedge into the operating position prior to tightening of the retainer screw against the outer roll frank. Thus, the roll may not be properly placed in the center of the roll shaft. Second, the outer roll franks can be damaged by the torque transfer retainer screw.

It is an object of the present invention to provide an improved roll assembly that overcomes these disadvantages.

The roll assembly according to the invention comprises a support shaft with a tapered section from the joint to the end section, and a ring roll with inner and outer flanks and cylindrical holes. The roll is mounted axially on the shaft and has a cylindrical hole surrounding the tapered shaft section and the inner flank mounted against the shaft joint. The tapered sleeve is inserted between the tapered shaft section and the cylindrical roll hole. The load ring is rotatably fixed relative to the shaft end section on the outer side of the roll and axially movable on the shaft end section on the outer side of the roll.

An elastic element is interposed between the sleeve and the load ring to properly maintain the initial gap between the load ring and the outer flank of the roll, and a roll retainer is mounted on the outside of the shaft end section of the load ring. The roll retainer acts through the elastic element in engagement with the load ring to stepwise and at least partially close the gap between the roll and the load ring while pressing the sleeve to the wedge engagement position stepwise and precisely. The screw member screwed through the roll retainer is tightened to press the load ring against the outer flank of the roll, thereby pressing the inner flank of the roll against the shaft joint.

These and other advantages and objects will be described in more detail with reference to the accompanying drawings.

1 is a longitudinal sectional view taken through a mill roll assembly according to the present invention;

2A to 2D are sectional views showing the continuous steps in the installation of the roll assembly shown in FIG.

3 is a perspective view of an elastic element sandwiched between a tapered sleeve and a load ring;

4 and 5 are cross sectional views taken along lines 4-4 and 5-5, respectively.

<Explanation of symbols for the main parts of the drawings>

10: roll assembly

12: support shaft

14 tapered section

16: junction

20: end section

22: external spline

26: ring roll

28: inner flank

30: outer flank

32: exterior groove

34: cylindrical hole

36 tapered sleeve

40: load ring

44: disc spring

46: spring retainer

50: roll retainer

1 and 3 to 5, the roll assembly according to the present invention is generally indicated at 10. The roll assembly includes a support shaft 12 with a tapered section 14 from the joint 16 provided by the pair of fingers 18a, 18b to the end section 20. The shaft end section 20 is splined outward at 22 and screwed at 24. The ring roll 26 has inner and outer flanks 28 and 30, outer grooves 32, and cylindrical holes 34. The roll 26 is mounted axially on the shaft 12 and has an inner flank 28 mounted against the joint 16 and a cylindrical hole 34 surrounding the tapered shaft section 14.

The tapered sleeve 36 is inserted between the tapered shaft section 14 and the cylindrical hole 34 of the roll 26. The outer end of the sleeve is splined internally as in 38 for mechanical mutual coupling with the outer spline 22 of the shaft end section 20.

The load ring 40 is received in the shaft end section 20 and is axially movable relative to the shaft end section. The load ring is rotatably fixed to the shaft by an inner spline 42 that cooperates in mechanical mutual engagement with the outer shaft spline 22. The disc spring 44 is captured in the inner recess of the load ring by a spring retainer 46 which is held in place by the snap ring 48.

The roll retainer 50 is screwed onto the end section 20 of the roll shaft. The jack bolts 52 are screwed into the through holes that receive the thrust button 54.

The roll assembly is installed in steps as shown by the subsequent figures.

Figure 2a

The roll 26 is mounted on the shaft end section 20 with a cylindrical hole 34 surrounding the tapered shaft section 14 and the inner flank 28 in contact with the joint 16. The tapered sleeve 36 is inserted without the radial interference fit between the roll hole 34 and the shaft section 14.

Figure 2b

The load ring 40 is mounted on the shaft end section 20, and the inner spline 44 is mutually coupled with the outer spline 22. The disc spring 44 cooperates with the outer end of the sleeve 36 via a spring retainer 46 to flexibly maintain a gap 56 between the load ring and the outer flank 30 of the roll.

Figure 2c

The roll retainer 50 is screwed onto the shaft end section 20 and tightened to press the disk spring 44 to a size sufficient to partially close the gap 56, with the final elastic force being tapered sleeve 36. And an interference fit between the roll hole 34 and the tapered shaft section 14. Thus, at this junction, the roll is precisely centered on the shaft.

Figure 2d

The jack bolts 52 are tightened to press the load ring 40 against the outer flank 30 of the roll 26, as a result of which the inner roll flank 28 is pressed against the joint 16.

In view of the foregoing, it will be understood that, before tightening the jack bolts 52, the tapered sleeve 36 is tightly and tightly fitted between the cylindrical roll hole and the tapered shaft section. This ensures that the roll is precisely centered on the roll shaft and axially aligned with the roll shaft. The jack bolt tightening then completes the installation by axially fastening the roll between the shaft joint and the load ring, where the load ring is in the annular area in contact with the outer roll flank. This reliably transmits torque from the roll shaft to the roll without causing roll damage.

According to the invention, the tapered sleeve cannot be fully wedge into the working position prior to tightening of the retainer screw against the outer roll frank, so that the roll cannot be properly placed in the center of the roll shaft, and the outer roll frank is the torque transfer retainer. A rolling mill roll assembly is provided which overcomes the disadvantages of the prior art which can be damaged by screws.

Claims (5)

A support shaft having a tapered section from the junction to the end section, Ring rolls with inner and outer flanks and cylindrical holes, A tapered sleeve inserted between the tapered section of the shaft and the cylindrical hole of the roll; A load ring rotatably fixed relative to the end section of the shaft and axially movable on the end section of the shaft; Elastic means interposed between the load ring and the sleeve to flexibly maintain a gap between the load ring and the outer flank of the roll; A roll retainer mounted on an end section of the shaft; A bolt member screwed to the through hole in the roll retainer, The roll has a cylindrical hole surrounding the tapered shaft section and the inner flank mounted axially on the shaft and mounted to the joint, the roll retainer closes the gap and the tapered section of the shaft An elastic element is actuated in a joining relationship with the load ring to axially wedge the tapered portion of the sleeve between the cylindrical holes of the roll, the tightening of the bolt member against the outer flank of the roll And press to press the outer flank of the roll against the joint. The rolling mill roll assembly of claim 1, wherein the load ring is formed with a spline in an end section of the shaft. The rolling mill roll assembly as claimed in claim 1, wherein said resilient means comprises a disk spring interposed between an end of said sleeve and an adjacent surface of said load ring. The rolling mill roll assembly of claim 1, wherein the roll retainer is threaded onto an end section of the shaft. The rolling mill roll assembly of claim 1, further comprising a thrust button interposed between the bolt member and the load ring.