JPH10166013A - Grinding device for rolling roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding device for rolling rolls with which the generation of reversal flow of a cleaning liquid which is jetted from nozzles is surely prevented by setting the colliding angle of the nozzle properly. SOLUTION: This grinding device is provided with a grindstone 2 for grinding the surface of a roll 1, motor for rotating this grindstone 2, head in the tip part of which a opening part 10a is formed so that the same grindstone 2 is brought into contact with the roll 1 and which is provided so as to enclose the grindstone 2 without contacting with the roll 1, slit nozzle 22 which is provided along the peripheral edge of the opening part 10a of the head so as to jet the cleaning liquid to the contact part of the grindstone 2 with the roll 1 and a cleaning liquid supplying means and cleaning liquid recovering means which are provided in the head 10. In such a case, the collision angle θ of the slit nozzles to the surface of the roll is set not larger than a limit angle on a curved line on which respective points of 18 deg. at the discharge pressure of the cleaning liquid of 5kg/cm<2> , 40 deg. at 10 kg/cm<2> , 45 deg. at 20kg/cm<2> , 48 deg. at 25kg/cm<2> and 50 deg. at 30kg/cm<2> are tied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for grinding a rolling roll such as a cold rolling mill, and more particularly to an apparatus for performing online grinding.

[0002]

2. Description of the Related Art Conventionally, as this kind of grinding apparatus, FIGS.
There is one shown in FIG.
Reference).

[0003] In these figures, reference numeral 2 denotes a mortar-shaped grindstone which is brought into contact with the surface of a cylindrical roll 1 and has a washer 2a.
To the tip of the rotating shaft 3. The base end of the rotating shaft 3 is connected to a motor 5 provided in a grinder case 4 which forms a main body. This rotating shaft 3 is
It is rotatably mounted on the grinder case 4.

A rod portion 7 of a hydraulic cylinder 8 is connected to the end of the grinder case 4.
Are supported by a trunnion 9 so as to be swingable on a roll-axis-direction movable table 9a. A head 11 surrounding the grindstone 2 is mounted coaxially with the rotating shaft 3 on the tip end side of the grinder case 4.

An opening 11 a is formed at the tip end of the head 11 so as to be coaxial with the rotating shaft 3. Opening 1
A slit nozzle 12 is provided at the peripheral portion of
Is formed with a collision angle θ with respect to the peripheral surface of the roll 1 (a tangent starting from the collision point P in the circumferential direction) starting from a collision point P on the peripheral surface of the roll 1.

The slit nozzle 12 has a head 11
Is connected to a cleaning water supply device (not shown).
A hood 13 is provided inside the head 11, and a washing water recovery device (not shown) is connected to the hood 13.

A spiral blade 15 is mounted around the grindstone 2 so as to be integral with the washer 2a.

For example, in an online roll grinding device for a cold rolling line, a plurality of such grinding devices are mounted at equal intervals on a roll axis direction moving table 9a, and the roll axis direction moving table 9a has only this distance dimension. It is designed to reciprocate.

In order to grind the peripheral surface of the roll 1 with such a grinding device, the hydraulic cylinder 8 is rotated while the roll 1 is rotated.
And adjusting the grinder axial moving device 6 to bring the grindstone 2 into contact with the roll 1 and the opening 11 a of the head 11.
Is formed in a minimum gap g so as not to contact the roll 1, and the roll axial direction moving table 9 a is reciprocated while the grindstone 2 and the blade 15 are driven and rotated by the motor 5.

[0010] Then, washing water 20 supplied from a washing water supply device (not shown) is jetted from the slit nozzle 12 to cool the grinding portion and to wash the cutting powder and the dropped abrasive grains. At this time, if the washing water pressure is increased, the washing ability is increased, and it is possible to cope with faster roll grinding.

The washed washing water 21 containing the cutting powder of the roll 1 and the abrasive grains falling off the grindstone 2 is sent from the hood 13 to a washing water collecting device (not shown) by the rotation of the spiral blade 15. At this time, the jet 20 a of the washing water 20 ejected from the slit nozzle 12 forms a liquid flow curtain, and prevents the washed washing water 21 from leaking from the gap g between the head 11 and the roll 1.

[0012]

In the conventional apparatus described above, the collision angle θ of the jet 20a is set without special consideration, so that the discharge pressure of the jet 20a is small or the collision angle θ is small. If it is large (greater than the limit angle according to the discharge pressure),
As shown in FIG. 7, a reversal flow 20 b of the cleaning water 20 is generated, and the cleaning water 21 including the cutting powder and the dropped abrasive particles does not completely enter the hood 13, and a part of the cleaning water 21 is in contact with the head 11. There was a problem of leakage from the gap g with the roll 1.

Therefore, when this grinding apparatus is used in an online roll grinding apparatus of a rolling line, the washed washing water 20b that has leaked falls onto the rolled material, and this rolled material is rolled by the next rolling mill. When this is done, the rolled material is scratched and the product value is significantly reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rolling roll grinding apparatus capable of properly setting a collision angle of a nozzle and reliably preventing a reverse flow of a cleaning liquid injected from the nozzle. It is in.

[0015]

According to the present invention, there is provided an apparatus for grinding a rolling roll, comprising: a grindstone for grinding a surface of a roll; rotating means for the grindstone; and an opening at a tip end of the grindstone so that the grindstone comes into contact with the roll. A head formed so as to surround the grindstone in a non-contact manner with the roll, and provided along the periphery of the head opening so as to spray a cleaning liquid to a contact portion between the grindstone and the roll. A nozzle and a grinding device for a rolling roll provided with a cleaning liquid supply unit and a cleaning liquid recovery unit provided on the head, wherein a collision angle of the nozzle with respect to the roll surface is changed by a reverse flow of the cleaning liquid injected from the nozzle. In order to prevent the occurrence of such a problem, the angle is set to be equal to or smaller than a limit angle corresponding to the discharge pressure of the cleaning liquid.

Also, a grindstone for grinding the surface of the roll, a rotating means for the grindstone, and an opening formed at the tip so that the grindstone comes into contact with the roll, surrounds the grindstone without contacting the roll. A nozzle provided along the periphery of the head opening so as to spray a cleaning liquid to a contact portion between the grindstone and the roll; a cleaning liquid supply unit and a cleaning liquid recovery unit provided in the head A grinding angle of the nozzle against the roll surface, the discharge pressure of the cleaning liquid is 5 kg.
/ Cm ² at 18 °, 10 kg / cm ² at 30 °, 15 kg /
In ^{cm 2 40 °, 20kg / cm} 2 in 45 °, 25kg / cm
² is set to be equal to or less than the limit angle on the curve connecting the respective points of 48 ° and 30 kg / cm ² at 50 °.

[Operation] While the roll is rotating, a minimum gap is formed between the opening of the head and the roll so that the roll does not come into contact with the roll, and the grindstone is reciprocated in the roll axial direction while rotating by pressing the grindstone against the roll. Let it. By injecting the cleaning liquid supplied by the cleaning liquid supply means from the nozzle at the above-described required discharge pressure or more and at the collision angle or less, the generation of reverse flow of the cleaning liquid is prevented, and the leakage of the cleaned cleaning liquid from the gap is prevented. While washing the cutting powder and the dropped abrasive grains, the washed washing liquid is completely collected by the washing liquid collecting means.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a rolling roll grinding apparatus according to the present invention will be described in detail with reference to embodiments.

[Embodiment] FIG. 1 shows an embodiment of the present invention, and is a longitudinal sectional view of a rolling roll grinding apparatus.
FIG. 3 is a discharge pressure-collision angle diagram showing each point of the generation of the reverse flow of the washing water in the experiment. In these drawings, the same members as those of the conventional device are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIGS. 1 and 2, reference numeral 2 denotes a mortar-shaped grindstone which is brought into contact with the surface of a cylindrical roll 1, and a washer 2
The screw is screwed to the tip end of the rotating shaft 3 by a. A spiral blade 15 is mounted around the grindstone 2 so as to be integral with the washer 2a.

The rotary shaft 3 is rotatably mounted on a grinder case 4 forming a main body, and a base end thereof is connected to a motor (not shown) provided in the grinder case 4.

The end of the grinder case 4 is connected to a moving table in the roll axis direction through a hydraulic cylinder (not shown), and a rectangular cylindrical head 10 surrounding the grindstone 2 has a rotating shaft at the end thereof. 3 is mounted coaxially.

An opening 10 is provided at the tip end of the head 10.
is formed so as to be coaxial with the rotating shaft 3, and a number of slit nozzles 22 are formed along the periphery of the opening 10a. Further, a hood 13 is provided inside the head 10, and a washing water recovery device (not shown) is connected to the hood 13.

The slit nozzle 22 has a head 10
Is connected to a cleaning water supply device (not shown).

As shown in FIG. 3, when the discharge pressure of the cleaning water 20 from the slit nozzle 22 impinges on the surface of the roll 1, the slit nozzle 22 has a collision angle θ of 5 kg. 18 / cm ²
°, the 10 kg / cm ² 30 °, the 15 kg / cm ² 40
°, the 20 kg / cm ² 45 °, the 25 kg / cm ² 48
At 30 ° / 30 kg / cm ² , it is set to be equal to or less than the value (limit angle) on the curve connecting the 50 ° points.

FIG. 3 shows a slit width W = 0.1 to 1.0 m.
m, a curve connecting the points of the generation of the reverse flow 20b (see FIG. 7) by the experiment under the condition of the nozzle-roll distance H = 3 to 50 mm, which is the basis of each point described above. .

The other structure is the same as that of the conventional device.

In such a grinding apparatus, for example, in order to grind the peripheral surface of a work roll of a cold rolling line online, the opening 10 of the head 10 is rotated while the roll 1 is rotated.
a and the minimum gap g between the roll 1 and the head 10
The grinder case 4 is reciprocated in the roll axis direction while the grinding wheel 2 is pressed against the roll 1 and is driven and rotated together with the blade 15 while not in contact with the roll 1.

Then, a jet 20a of washing water 20 supplied from a washing water supply device (not shown) is jetted from the slit nozzle 22 at a pressure higher than the above-mentioned discharge pressure and smaller than the collision angle θ to cool the roll 1 and the grindstone 2, Washing of cutting powder, falling abrasive grains and the like prevents generation of the reversal flow 20b.

The washed washing water 21 is supplied to the spiral blade 15
Is completely collected from the hood 13 to the washing water collecting device (not shown), and does not leak to the outside of the head 10, thereby preventing generation of flaws in the rolled material.

Instead of the mortar-shaped grindstone 2 that is driven and rotated, a cup-shaped non-driven grindstone may be used, and a method of rotating by rotating the roll 1 may be used. Further, instead of the slit nozzle 22, a spray nozzle having cleaning water ejection holes arranged in rows can be used. Further, the head 10
May have a cylindrical shape. Further, instead of the cleaning water 20, an abrasive, a rolling oil, or the like may be used as the cleaning liquid.

[0032]

In the rolling roll grinding apparatus according to the present invention, the cleaning liquid is sprayed from the nozzle at a required discharge pressure or higher and at a collision angle or less. The generation of reverse flow of the cleaning liquid can be reliably eliminated.

Therefore, the cleaned cleaning liquid does not leak out of the head from the gap between the head and the roll. In the online roll grinding apparatus, the cleaned cleaning liquid containing the cutting powder and the dropped abrasive particles is applied onto the plate material. It is possible to prevent the occurrence of flaws in the plate material due to rolling, straightening, and the like of the subsequent rolling mill, leveler, etc. without dropping, thereby improving the quality of the plate material.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a mill for a rolling roll, showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a discharge pressure-collision angle diagram showing each point of generation of a reversal flow of cleaning water in an experiment.

FIG. 4 is a longitudinal sectional view showing an example of a conventional roll grinding device.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a longitudinal sectional view showing a roll grinding unit of FIG. 4;

FIG. 7 is a longitudinal sectional view showing a washing water jet and a reverse flow in the roll axis direction of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roll 2 Whetstone 3 Rotation axis 10 Head 10a Opening 20 Cleaning water 20a Jet 20b Reverse flow 22 Slit nozzle θ Collision angle

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuo Morimoto, Inventor 4-62 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Keiji Mizuta 4-chome Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture No. 6-22 Mitsubishi Heavy Industries, Ltd.Hiroshima Research Laboratory (72) Inventor Yukio Hiasa 4-4-2 Kanon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd.Hiroshima Research Center (72) Inventor Fumio Taki Tokai City, Aichi Prefecture 5-3 Nippon Steel Corporation Nagoya Works (72) Inventor Hiroyuki Asano 5-3 Tokai Town, Tokai City, Aichi Prefecture 5-3 Nippon Steel Corporation Nagoya Works (72) Inventor Ryuji Yabe Tokai City, Aichi Prefecture 5-3 Tokaicho Nippon Steel Corporation Nagoya Works

Claims (2)

[Claims] 1. A grindstone for grinding a surface of a roll, a rotating means for the grindstone, and an opening formed at a tip portion so that the grindstone comes into contact with the roll, and surrounding the grindstone without contact with the roll. A nozzle provided along the periphery of the head opening so as to spray a cleaning liquid to a contact portion between the grindstone and the roll; a cleaning liquid supply unit and a cleaning liquid recovery unit provided in the head A grinding angle of the nozzle with respect to the roll surface, a limiting angle according to the discharge pressure of the cleaning liquid, so that a reverse flow of the cleaning liquid ejected from the nozzle does not occur. A rolling roll grinding apparatus characterized by the following settings. 2. A grindstone for grinding a surface of a roll, a rotating means of the grindstone, and an opening formed at a tip portion so that the grindstone comes into contact with the roll, and surrounding the grindstone without contact with the roll. A nozzle provided along the periphery of the head opening so as to spray a cleaning liquid to a contact portion between the grindstone and the roll; a cleaning liquid supply unit and a cleaning liquid recovery unit provided in the head And a collision angle of the nozzle with respect to the roll surface, wherein the discharge pressure of the cleaning liquid is 5 kg / cm.
² at 18 °, 10 kg / cm ² at 30 °, 15 kg / cm ²
In 40 °, 20kg / cm ² in 45 °, 25 kg / in cm ² 48 °, the rolling roll, characterized in that set to below the limit angle on the curve connecting each point of 30kg / cm ² in 50 ° Grinding equipment.