JP3285144B2 - Rolling roll centering device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill for rolling a wire or a bar, in which each rolling roll is moved in a rolling direction and an axial direction to form a reference pass line cross section with a hole shape of each roll. The present invention relates to an apparatus for centering a rolling roll.

[0002]

2. Description of the Related Art Conventionally, wire and rods have been rolled by a rolling mill having a plurality of rolls having circumferential grooves on the outer peripheral surface.
This is performed by passing a material through a cross section of a pass line formed by a circular arc (hole) of the circumferential groove of each roll, but mechanical play is inevitably generated during rolling. Therefore,
In order to prevent the displacement of the rolling position due to mechanical backlash and obtain products with high dimensional accuracy, move each roll in the rolling direction and axial direction so that the standard pass line cross section is formed by the hole shape of each roll. So-called "centering" work.

[0003] As a method of centering in two-roll rolling in which a material is reduced by one or two rolls, a state in which both sides of a circumferential groove on the peripheral surface of an opposing roll are abutted (kissing state).
Then, a method is adopted in which the rolls are moved in the axial direction and the end faces of the rolls are brought into contact with a reference plane to thereby center the centers in the axial direction.

However, in four-roll rolling in which the material is reduced from two directions orthogonal to each other by two-to-four rolls, since both sides of the circumferential groove of the roll peripheral surface are inclined, centering by the kissing method is not possible. Impossible. Therefore, in four-roll rolling, using a gauge bar, a method of centering while observing the degree of contact of the circumferential groove of each roll with the gauge bar,
Alternatively, a method of simply rolling using lead, comparing the shape of the rolled lead with a reference shape, and moving the roll by the difference between the two is adopted.

[0005]

However, the above-described centering method by four-roll rolling requires a lot of trouble and has a problem that the centering accuracy is not good.

In Japanese Utility Model Laid-Open No. 5-78301,
A three-roll elongator for accurate centering is described. This three-roll elongator is provided with centering aids on the entry side and the exit side of each roll, which are capable of pressing the components on the roll shaft side from the housing in the load direction during rolling.

However, since this centering assisting tool does not press the roll itself, but presses the components on the roll shaft side at two points, the entrance side and the exit side of the roll, the rolling state can be accurately determined. It is difficult to reproduce. Therefore, accurate centering is difficult, and sufficient centering accuracy cannot be obtained. In addition, since the centering assistant described in the embodiment pushes the component part of the roll shaft by the screwing of the adjusting bolt, it takes time for adjustment, and measures an accurate pressing force, The pressing force cannot be adjusted accurately.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and provides a centering device capable of reducing the labor required for centering work and performing high-precision centering. As an issue.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a centering apparatus for centering a rolling roll of a rolling mill in which a plurality of rolls having a circumferential groove forming a groove shape on an outer peripheral surface are installed. The apparatus is characterized in that a holding member for holding both end faces of each roll and a load applying member for applying a force in the same direction as the rolling reaction force to the roll via the holding member are provided.

According to this centering device, both ends of each roll are held by the holding members, and the rolls are pressed in the rolling direction in a state where a force in the same direction as the rolling reaction force is applied to each roll by the load applying member. In addition, the centering operation can be performed by moving in the axial direction. This prevents a change in the roll position due to mechanical play during rolling,
Centering accuracy is increased.

In this centering device, a concave portion is provided on both end surfaces of the roll along a circle centered on the roll axis, and the holding member has a protrusion inside the leading end thereof which can be fitted into the concave portion, Preferably, the protrusion is engaged with the concave portion on the side opposite to the pass line side of the roll to hold the roll.

In this centering device, it is preferable that the load applying member has a load measuring function.
It is preferable that the centering device further includes a projector that irradiates light to a region including a cross section of a pass line formed by a plurality of roll holes and projects an enlarged image thereof.

[0013]

Embodiments of the present invention will be described below. FIG. 1 is a schematic configuration diagram showing a roll centering device corresponding to one embodiment of the present invention, and FIG.
It is a top view showing arrangement of a roll in a roll housing in this centering device.

The centering device includes a support table 2 for supporting a roll housing 1 mounted thereon, a bracket 3 fixed at four positions on the support table 2, and a hydraulic cylinder supported on the upper end of each bracket 3. (Load applying member) 4, a clamp (clamping member) 5 fixed to the tip of the piston rod 41 of each hydraulic cylinder 4 to clamp the roll R in the roll housing 1, and transmitted illumination installed inside the support base 2. Device 6
And a projector 8 installed on the roll housing 1 via a cradle 7.

The roll housing 1 is a roll housing for a four-roll rolling mill, and has a substantially octagonal planar shape, and four rolls R are arranged in a cross shape in a plan view. With this arrangement, the cross-section arc (hole type) K of the circumferential groove M of each roll R is provided at the center of the cross where the four rolls R gather.
Thus, a portion (pass line cross section) 9 through which the rolling material passes is formed. Further, the brackets 3 are fixed at four positions on the support base 2 outside the cross.

The clamp 5 clamps both ends of each roll R on the opposite side to the pass line side, and details thereof are shown in FIG. The clamp 5 sandwiches the roll R between the ends of two holding plates 51, and has a structure in which the ends of the two holding plates 51 open and close starting from the hydraulic cylinder 4 side.

That is, on the hydraulic cylinder 4 side, a wing bolt 52 extending from the outside of one holding plate 51 to the inner surface of the other holding plate 51 is provided, and each holding plate 51 is provided with an auxiliary plate 53 fixed to the inner surface. Are supported by a shaft 54. Thus, if the wing bolts 52 are loosened, the holding plate 51 can be rotated about the shaft 54 so that the distance between the ends of the two holding plates 51 can be increased. Can be narrowed.

A projection 51a is provided on the inner surface of the leading end of each of the holding plates 51, and a concave portion H for receiving the projection 51a is provided on both end surfaces of the roll R, the entire circumference of a circle centered on the roll axis. It is provided in. The upper and lower ends of both holding plates 51 are
The support member 55 having a U-shaped cross section is supported via a predetermined gap, and the tip of the piston rod 41 of the hydraulic cylinder 4 is fixed to the support member 55.

Accordingly, if the wing bolts 52 are loosened to widen the ends of the two holding plates 51, the roll R is inserted therein, and the wing bolts 52 are tightened so that the projections 51a enter the recesses H thereof. It is securely clamped by the clamp 5.

The bracket 3 is provided at the base end of the hydraulic cylinder 4.
Is fixed, the upper end of the bracket 3 is sandwiched between the end members 42, and both are connected by pins 43. If this pin 43 is loosened, the hydraulic cylinder 4 can be rotated around this pin 43. That is, when the clamp 5 integrated with the hydraulic cylinder 4 is attached to and detached from the roll R, the hydraulic cylinder 4 may be rotated about the pin 43.

A guide member 22 for setting the roll housing 1 at a predetermined position is provided on the support base 2. At the center of the upper part of the roll housing 1, there is provided a mounting hole G for the pedestal 7.
It is installed by fitting the projection 70a of the base portion 70 to the base. Thus, a light collector 81 described later is held vertically to the roll housing 1.

The projector 8 has a condenser 81 having a built-in optical system.
A portion 9 through which the material formed by the hole type K of the roll R is passed by the light radiated upward from the transmissive illumination device 6 in the support base 2 and the screen 82 is coupled thereto.
Is projected on the screen 82. The light collector 81 is rotatably supported by a bearing B at the center of the upper plate member 71 of the receiving stand 7.
By rotating 1, the projection surface of the screen 82 can be moved to a position where the operator can easily see.

In order not to block the light emitted from the transmissive illumination device 6, holes A1-A through which light is transmitted are formed in the upper plate member 21, the roll housing 1 and the base portion 70 of the support base 2.
3 is open. In addition, the upper plate member 21 of the support base 2 includes
A space A4 for inserting a protective cover for protecting the transmitted illumination device 6 when the transmitted illumination device 6 is not used is formed.

When centering is performed by this centering device, first, a roll housing 1 in which four rolls R are housed in a cross shape is installed at a predetermined position on a support base 2, and each clamp 5 The ends of both ends of each roll R opposite to the pass line side are sandwiched. Next, a predetermined pressure is applied to each hydraulic cylinder 4 to contract the piston rod 41. Thereby, each clamp 5 is pulled outward, so that a force in the same direction as the rolling reaction force is applied to the roll R sandwiched between the clamps 5. Here, the magnitude of the force applied to the roll R is about 10% to 50% of the rolling load. In this centering device, the magnitude of the force actually applied to the roll R can be accurately obtained by measuring the pressure applied to the hydraulic cylinder 4 with a hydraulic pressure measuring device or the like, and the roll R Adjustment of the applied force can also be easily performed.

Next, in this state, the protective cover is removed from the support base 2 and the transmission illuminating device 6 is turned on, and the projector 8 is turned on.
Projects an enlarged image of the portion 9 through which the rolling material passes through onto the screen 82. The centering operation is performed by moving the roll with a roll moving device (not shown) while looking at the enlarged image.

Therefore, according to this centering device, the centering accuracy is increased, and the labor required for centering work is reduced. In addition, since the centering device is configured to hold the roll by engaging the protrusion 51a of the clamp 5 with the concave portion H of the roll R, the both end surfaces of the roll R are easily and reliably held by the clamp 5. Is done.

In this embodiment, it is described that the apparatus of the present invention is used for the centering operation of four-roll rolling. However, the apparatus of the present invention is not limited to the centering operation of four-roll rolling. It can be applied to centering such as two-roll rolling and three-roll rolling.

The holding member is not limited to the clamp 5 described above, and may have any structure as long as it can hold both end faces of the roll. Further, the concave portion of the roll does not necessarily need to be provided on the entire circumference of a circle centered on the roll axis, and may be provided at several positions along the circle with an appropriate length. Further, the load applying member is not limited to the hydraulic cylinder 4 that pulls the holding member outward, and may have any structure as long as it can apply a force in the same direction as the rolling reaction force to the roll via the holding member. Is also good.

In the case where there is no projector in the centering device of the above embodiment, the centering is troublesome and the centering accuracy is reduced as compared with the case where there is a projector. The present invention is not limited to a projector equipped with a projector because the labor required for centering is greatly reduced and the centering accuracy is also greatly improved.

[0030]

As described above, according to the rolling roll centering apparatus of the present invention, since the roll position can be prevented from changing during rolling by mechanical play, the centering accuracy is increased. In addition, if the projector is provided, the centering operation can be performed while viewing the enlarged image of the hole-shaped portion, so that the labor required for the centering operation can be reduced, and the centering accuracy can be further improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an apparatus for centering a rolling roll corresponding to an embodiment of the present invention.

FIG. 2 is a plan view showing an arrangement of rolls in a roll housing in the centering device of FIG. 1;

FIG. 3 is a plan view showing details of a holding member in the centering device of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roll housing 2 Support base 3 Bracket 4 Hydraulic cylinder (load addition member) 5 Clamp (clamping member) 6 Transmission illumination device 8 Projector 82 Screen 9 Material passing part (pass line cross section) R Roll M Peripheral groove K Hole type

Continuation of the front page (56) References JP-A-11-104707 (JP, A) JP-A-11-57823 (JP, A) JP-A-11-47809 (JP, A) JP-A-8-5343 (JP) JP-A-7-275907 (JP, A) JP-A-6-42529 (JP, A) JP-A-57-124506 (JP, A) JP-A-5-78301 (JP, U) JP-A-5-78301 (JP, U) 4-43401 (JP, U) JP 51-10192 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 31/20 B21B 13/10

Claims (4)

(57) [Claims] 1. A centering device for a rolling roll of a rolling mill in which a plurality of rolls each having a circumferential groove having a groove shape on its outer peripheral surface are provided. A clamping member for clamping both end surfaces of each roll, and And a load applying member for applying a force in the same direction as the rolling reaction force to the roll. 2. A roll having a recess along a circle centered on a roll axis at both end surfaces of the roll, wherein the holding member has a protrusion inside the tip thereof which can be fitted into the recess, and The roll roll centering device according to claim 1, wherein the roll is held by being engaged with the concave portion on the side opposite to the pass line side. 3. The apparatus according to claim 1, wherein the load applying member has a load measuring function. 4. A projector according to claim 1, further comprising a projector that irradiates light onto a region including a cross section of a pass line formed by a plurality of rolls and projects an enlarged image thereof. A centering device for a rolling roll according to one of the preceding claims.