JPS63273505A - Assembled roll - Google Patents

Abstract

PURPOSE:To obtain an assembled roll whose sleeve is easily detachable by using a pressurized medium at the time of detaching the sleeve and maintaining an interference condition during pressurization. CONSTITUTION:At the time of assembling a sleeve 2 and an arbor 3. The large diameter side of the sleeve 2 is put to face the small diameter side of the arbor 3 and both the sleeve 2 and arbor 3 are oppositely moved in the axial direction to put the sleeve 2 on a body 4. Then, a medium (water, oil, etc.) is pressurized at a prescribed pressure and is injected into a 1st gap 10 and 2nd gap 11 through a 1st pipe 13 and a 2nd pipe 14; the medium is sealed by a seal ring 12, the sleeve 2 is expanded in the radial direction to be movable in the axial direction. The total interference amount is previously set to be a dimension cancelable with expansion by the medium so that the sleeve 2 is completely put on the body 4 and then the sleeve 2 and arbor 3 are fixed by a prescribed interference amount by stopping supply of the medium.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to assembled rolls for rolling.

(Prior Art) An assembly roll in which a sleeve is fitted and fixed to an arbor by shrink-fitting or cold-fitting with a predetermined tightness is well known.

Such assembled rolls have great advantages in that materials suitable for rolling can be freely combined and the sleeves can be replaced.

However, there have been various problems, such as the need for heating or cooling equipment during assembly, and the need for fusing or cutting means when replacing the sleeve.

Therefore, for example, Japanese Patent Publication No. 59-32204 discloses an assembly roll in which a sleeve can be attached and detached without requiring a heating device, a cooling device, a fusing device, or a cutting device.

This assembly roll consists of a variable crown roll that expands the sleeve in the radial direction by supplying a pressure medium to the gap formed between the arbor and the sleeve, and a hole-shaped sleeve provided with holes attached to the outer periphery of the variable crown roll. By controlling the amount of roll crown by adjusting the pressure of the medium, the hole-shaped sleeve was attached and detached.

(Problems to be Solved by the Invention) In the method described in Japanese Patent Publication No. 59-32204, the grooved sleeve is fixed by a variable crown roll, but it is necessary to maintain a high pressure of the pressure medium at all times during rolling. The structure is complicated, and there are operational difficulties in that the pressure of the pressure medium must be controlled against the torque and thrust force generated during rolling.

In other words, if the pressure is low, the hole type sleeve cannot be fixed, and
If the pressure is too high, the sleeve will break in the axial direction if the tensile stress in the circumferential direction (tangential direction) on the inner surface of the grooved sleeve exceeds the material strength of the grooved sleeve, so it is necessary to control the pressure to an appropriate level. This is an important point.
- However, such pressure control has been extremely difficult.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems and provide an assembly roll in which a sleeve can be easily attached and detached.

(Means for solving the problem) The present invention uses a pressure medium when attaching and detaching the sleeve,
It is designed to maintain a tight fit during pressure. That is, the present invention is characterized in that, in an assembled roll in which a sleeve is fitted to an arbor with a predetermined spacing, a pressure medium supply gap is provided at the contact surface between the arbor and the sleeve, and a gap is provided on both sides of the gap in the axial direction. a seal ring is provided, the outer circumferential surface of the arbor and the inner circumferential surface of the sleeve are formed into stepped circumferential surfaces in which one side in the axial direction has a larger diameter than the other through the gap; The point is that the arbor and sleeve fit into each other with a clearance when a pressure medium of a predetermined pressure is supplied.

(for production) The assembled roll of the present invention is assembled in the following steps.

First, the small-diameter side of the arbor and the large-diameter side of the sleeve are arranged coaxially so that they face each other. Next, the sleeve is moved by relatively moving them in the axial direction until the large-diameter end of the arbor contacts the large-diameter end of the sleeve, and the small-diameter end of the arbor contacts the small-diameter end of the sleeve. Fit onto the arbor. At this time, the large diameter portion and the small diameter portion of the arbor and sleeve cannot be inserted any further in the axial direction due to the tightening mechanism.

Next, a pressure medium at a predetermined pressure is supplied to the gap formed between the contact surface between the arbor and the sleeve. This pressure medium is prevented from leaking by seal rings on both sides, and applies a radial pressing force to the inner peripheral surface of the sleeve.

This pressure medium expands the diameter of the sleeve, increasing its inner diameter, and the tightening gap becomes loose.

Thus, the sleeve and the arbor become movable relative to each other in the axial direction, and the large-diameter portions and small-diameter portions of the arbor and sleeve fit together.

Next, by removing the pressure of the pressure medium supplied to the gap, the inner diameter of the sleeve is contracted, and the arbor and sleeve are tightened with a predetermined tightening mechanism.

The assembly is now complete, and during rolling, the torque and thrust force are maintained by the tightening mechanism set at the contact area between the sleeve and the arbor. Therefore, during rolling use, the function is the same as that of conventional shrink-fit rolls, and breakage of the sleeve can be prevented by setting the tightening level within the allowable stress of the sleeve material.

Next, to remove the sleeve, a pressure medium is injected into the gap and pressurized to expand the inner diameter of the sleeve, and when the tightening level changes to a clearance level, the sleeve is moved in the axial direction. Then, when the facing state between the large-diameter portion and the small-diameter portion of the sleeve and arbor is released, the pressure medium supply is stopped. In this state, the large-diameter portion of the sleeve corresponds to the small-diameter portion of the arbor, so that the sleeve and the arbor can freely move in the axial direction from now on, allowing them to be separated.

(Example) Embodiments of the present invention will be described below based on the drawings.

Fig. 1 shows the assembled state of the assembly roll 1, Fig. 2 shows the sleeve 2 alone before assembly, and Fig. 3 shows the taber roll 1 before assembly.
3 single units are shown.

In FIG. 1, the arbor 3 has a body portion 4 at its axial center, and bearing portions 6 having a smaller diameter than the body portion are formed on both sides of the body portion 5 via a neck portion 5.

A sleeve 2 is fitted onto the outer periphery of the body 4 with a predetermined tightness. Relative movement between the sleeve 2 and the arbor 3 is prevented by this tightening fit, but for further reinforcement, the relative movement of one side of the sleeve 2 and the arbor 3 in the axial direction is prevented by a diameter provided at one end of the body 4. This is also effected by a large thrust stop 7, and the relative rotation of the sleeve 2 and the arbor 3 is also effected by a bolt 8 passed through the sleeve 2 and the arbor 3.

The outer peripheral surface of the sleeve 2 is provided with a hole 9 for angle rolling.
are formed at five locations along the axial direction.

An annular first gap 10 and a second annular gap 11 are formed at two locations along the axial direction at the contact surface between the outer circumferential surface of the body 4 of the arbor 3 and the inner circumferential surface of the sleeve 2. Each gap 10.1
Seal rings 12° 12, 12 are provided on both axial sides of 1. A first conduit 13 and a second conduit 14 communicating with each of the gaps 10.11 are opened in the arbor 3, and each conduit 13.14 opens at the end face of the bearing part 6.

The circumferential surface of the contact portion between the body portion 4 and the sleeve 2 is a stepped circumferential surface whose diameter gradually increases along the axial direction. One diameter portion 15 is defined as the first diameter portion 15, the other diameter portion is defined as the second diameter portion 16, and the left side thereof with the second gap 11 interposed therebetween is defined as the third diameter portion 17.

As shown in FIGS. 2 and 3, the inner diameters of each stage of the sleeve 2 are DI, DI, and Ds, and the thrust stop 7
The corresponding inner diameter is D4.

The outer diameter of each stage of the body 4 is d, dt, d.

The outer diameter of the thrust stop 7 is d4.

The relationship between these inner and outer diameters is d, < d before assembly.
, <d, <a4, D I < D! <Ds<D4dB>D
B, ds > D, d, > D, , d, < DJ, and d, tori, , d, and Dt, ds and D3, respectively, are tightened d, -D, -δ1, d8Dt"dt ,a
, −03=δ, is set, and DI +61
<D B , D 2 +δ2<D, there is a relationship as follows.

FIG. 4 explains the procedure for assembling the sleeve 2 and the arbor 3, and shows the large diameter side of the sleeve 2 and the arbor 3.
When the sleeve 2 is externally fitted onto the body 4 by arranging the smaller diameter sides of the sleeves to face each other on the same axis and moving them relative to each other in the axial direction, the sleeve 2 is fitted onto the body 4.
2 is movable to the corresponding position as d, but the end of the diameter d abuts the end of the diameter D1, and the end of the diameter d1 is a beam.

The sleeve 2 cannot be moved any further as it is in contact with the end of the diameter.

Therefore, when a pressure medium (water, oil, etc.) at a predetermined pressure is injected into the first and second gaps 10.11 through the first and second conduits 13.14, the pressure medium is sealed by the seal ring 12. and the sleeve 2 is inflated in the radial direction by a pressure medium,
d, < DI , a, < [), d.

< D s, and the sleeve 2 becomes movable in the axial direction. In other words, the tightening distances δ1, δ2, δ have dimensions that can be eliminated by expansion with a pressure medium.

The sleeve 2 is then completely fitted onto the body 4, resulting in the state shown in FIG. In this state, when the supply of pressure medium is stopped, the sleeve 2 and the arbor 3 are tightened at the original tightening point.

To remove the sleeve 2 from the arbor 3, the procedure described above may be reversed.

In addition, in order to facilitate the fitting of the sleeve 2 and the arbor 3,
It is preferable to chamfer the stepped portion on the inner surface of the sleeve 2. This chamfer prevents damage to the seal ring 12. In addition, the pressure of the pressure medium supplied to each gap 10.11 should be individually controlled (separate conduits 13, 14 are provided, but if the pressure is to be the same, one conduit is sufficient).

The results of rolling with the assembly roll 1 are shown below.

Roll dimensions: diameter 400φ crane x body length 650φ crane sleeve thickness = 75 cage, inner diameter 250u + hole Type: 5 pieces for angle finishing Pressure medium: TL flammable oil Tightening allowance: 2δ = 0.18 Fin medium pressure crab 1450kg/cJ Sleeve detachable pressure
Rolling: The product was installed in a two-high rolling stand and rolled with an angle of 50×6 size.

As a result, a good rolled product was obtained without any problems such as slippage, deformation, or breakage of the sleeve.

What is shown in FIG. 5 is an assembly roll l for flat steel and flat plates, and the gap 10 is provided at only one location.

Further, rotation of the sleeve 2 and the arbor 3 is prevented by a key 18.

What is shown in FIG. 6 is a channel-hole type assembly roll 1, and according to the figure, the second conduit 14 opens at the end face of the body 4. As shown in FIG.

What is shown in FIG. 7 is an assembled roll 1 for round bars and round steel, in which the width of the thrust stopper 7 is increased and the sleeve 2 is fitted over only a portion of the body 4.

What is shown in FIG. 8 is a hole-type assembled roll 1 for rolling automobile rims, in which two types of sleeves 2a and 2b are fitted into a body 4. As shown in FIG.

Note that the present invention is not limited to the above embodiments.

(Effects of the Invention) According to the present invention, only when the sleeve is attached and detached, pressure is applied to inflate the space between the sleeve and the taber by an amount exceeding the set tightening scale, and when used for rolling, it is not possible to The same effect as assembly rolls can be obtained by assembling rolls.

As shown in the conventional Japanese Patent Publication No. 59-32204, since it is not necessary to maintain the pressure in a constant state, the conventional pressure control is not necessary, and the structure is simple because there is no need for an intermediate sleeve. Also, since the sleeve can be made thicker, it has excellent accident resistance.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an assembly roll showing the first embodiment of the present invention, Fig. 2 is a sectional view of the sleeve, Fig. 3 is a front view of the arbor, Fig. 4 is a sectional view showing the assembly procedure, and Fig. 5 is a sectional view of the assembled roll. 8 are sectional views showing second to fourth embodiments of the present invention, respectively. 1--Assembled roll, 2-Sleeve, 3-Arnoy, 10.11--Gap, 12--Seal ring, 15.16.17'--Each diameter part (step part). Figure 1 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) In an assembly roll in which a sleeve is fitted to an arbor with a predetermined tightness, a pressure medium supply gap and position seal rings are provided on both sides of the gap in the axial direction at the contact surface between the arbor and the sleeve. , the outer circumferential surface of the arbor and the inner circumferential surface of the sleeve are formed into stepped circumferential surfaces in which one side in the axial direction has a larger diameter than the other, and when the tightening mechanism supplies a pressure medium at a predetermined pressure to the gap, An assembly roll characterized by a value that allows the arbor and sleeve to fit snugly.