KR101726070B1 - Apparatus for fixing damaged roll and method for drawing damaged roll using same - Google Patents

Apparatus for fixing damaged roll and method for drawing damaged roll using same Download PDF

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Publication number
KR101726070B1
KR101726070B1 KR1020150125040A KR20150125040A KR101726070B1 KR 101726070 B1 KR101726070 B1 KR 101726070B1 KR 1020150125040 A KR1020150125040 A KR 1020150125040A KR 20150125040 A KR20150125040 A KR 20150125040A KR 101726070 B1 KR101726070 B1 KR 101726070B1
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KR
South Korea
Prior art keywords
roll
cut
cutting
portions
fixing device
Prior art date
Application number
KR1020150125040A
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Korean (ko)
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KR20170028507A (en
Inventor
이재창
Original Assignee
주식회사 포스코
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Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to KR1020150125040A priority Critical patent/KR101726070B1/en
Publication of KR20170028507A publication Critical patent/KR20170028507A/en
Application granted granted Critical
Publication of KR101726070B1 publication Critical patent/KR101726070B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B28/00—Maintaining rolls or rolling equipment in effective condition
    • B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

The present invention relates to a fixing device for a cutting-off roll and a cutting-out roll-out method using the same, wherein the fixing device comprises a pair of end plates respectively coupled to the roll land portions; And a plurality of connecting bars connecting the end plates, wherein the cutting-off roll-out method comprises the steps of: installing the above-described fixing apparatus on the cutting-off roll; And a step of withdrawing the cut-off roll from the rolling mill, so that the time required for withdrawing the cut-off roll can be reduced, shortening the rest period, and ultimately improving the productivity.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fixing device for a cutting-off roll,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fixing device for a cutting-off roll used for drawing a cutting-off roll caused by a cutting-off accident among rolling rolls of a rolling mill, and a cutting-

Generally, steel mills are equipped with rolling mills for rolling steel bars or steel plates as materials. Such a rolling mill has a pair of rolling rolls driven by a motor, and a pair of back-up rolls for supporting the rolling rolls while applying a reduction amount thereto.

The rolling process is performed by increasing or decreasing the material by applying a continuous force while gradually narrowing the intervals between the rolling rolls while the material passes through between the two rolling rolls rotating.

In such a rolling process, there is a large amount of momentarily pressing down on the backup roll which applies a reduction amount to the rolling roll, or when the overload is applied due to the space between the rolling rolls being too narrow than the thickness of the material entering the rolling mill, When the head of the material is overlapped, the force that the material tries to pass through the rolling rolls causes one of the rolling rolls to break off.

If such a rolled roll is cut off, the end of the poorly-rolled cut-off roll is in close contact with the underlying roll or backup roll, so that scratches are generated on the surface of the rolled roll. In the worst case, A part of the surface of the substrate is separated and damaged.

As a result, there is a problem that the rolling process is stopped and a long time is required to replace the normal rolling roll than replacing the normal rolling roll, resulting in a considerable decrease in the efficiency of the replacement operation as a whole.

Particularly, the pull-out operation of the cut-off roll is performed by a worker directly into a narrow space of the roll stand, welding the cut-away portion of the cut-off roll for a long time, and then pulling out the pieces of the rough-cut roll at once. The fixing bar is not only welded to the outer circumferential surface of the cut pieces, but also welded to the roll choke.

 Such a pull-out operation takes time to restore the slabs of the cut-off rolls to the horizontal state and connect them to each other in order to withdraw the cut-off rolls, thereby increasing the downtime of the rolling process and increasing the loss cost. Furthermore, by welding the fastening bar to the roll chock for withdrawal of the cut-off rolls, damage and stiction of the roll chocks or bearings are caused.

(Patent Document 1) KR 20-0270881 Y1

SUMMARY OF THE INVENTION Accordingly, it is a primary object of the present invention to provide a fastening device for fastening a cut-off roll quickly and safely, and a method for taking out a cut-off roll using the same.

The fixing device according to the present invention includes: a pair of end plates respectively coupled to a roll land portion; A plurality of connection bars connecting the end plates through the connection plates and having threaded portions at both ends thereof; And a tightening nut fastened to both ends of the connecting bar passing through the end plate, wherein the end plate includes a pair of half portions formed at one side of the concave groove, And at least one through-hole is formed in which a bar is inserted and opened toward the tip of the half portion.

A cutting-off roll taking-out method according to the present invention comprises the steps of: Inserting a gap liner between the ablation roll and a roll located below the ablation roll; And a step of pulling the cut-off roll and a roll located under the cut-off roll together.

As described above, according to the present invention, it is possible to reduce the time required for withdrawing the cut-off roll, shortening the rest period, and ultimately improving the productivity.

Further, according to the present invention, there is no need to weld to the roll choke, thereby preventing damage and stiction of the roll choke and the bearing, thereby increasing the service life of parts and equipment.

1 is an exploded view showing a fixing device according to the present invention.
Fig. 2 is a side view showing a gap liner used with a fixing device according to the present invention. Fig.
3 is a view showing a method of pulling out the cutting roll when the upper rolling roll is cut off using the fixing device of the present invention.
4 is a view showing a method of pulling out the cutting roll when the lower rolling roll is cut off using the fixing device of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is an exploded view showing a fixing device according to the present invention, and FIG. 2 is a side view showing a gap liner used with a fixing device according to the present invention.

3 and 4) comprises a pair of end plates 10 (shown in Figs. 3 and 4) respectively coupled to the roll land portions 4 ); A plurality of connecting bars 20 which are connected to each other through these end plates and have threaded portions 21 at both ends thereof; And a tightening nut 23 fastened to both ends of the connecting bar passing through the end plate.

The end plate 10 is engaged with the roll land portion 4 having a smaller diameter than the maximum diameter portion of the cut-off roll 2 (see Figs. 3 and 4). The end plates each include a pair of half portions (11) each of which has a semi-circular cross-sectional concave groove (12) having a shape and a radius corresponding to the outer shape of the roll land portion,

These half portions 11 are provided with engaging portions 13 extending radially outward along one side of the half portion at both ends of the concave groove 12 and provided at substantially right angles to one side of the half portion. At least one through hole (14) is formed in each engaging portion.

Each of the half portions 11 may further include a curved portion 15 extending from the curved surface of the concave groove 12 at right angles to one side thereof. The curved portion may connect both coupling portions 13. Such a curved portion increases the surface area in which the end plate 10 contacts the roll land portion 4, so that the roll land portion is stably supported.

The through holes 14 of the engaging portions 13 corresponding to each other are aligned so that the half portions 11 face each other with the concave grooves 12 facing each other and then the bolts 18 are inserted into the through holes And by fastening the nut 19, both halves can be assembled to form one end plate 10.

At least one through-hole 16 is formed around the concave groove 12 of each half portion 11. The through-hole is opened toward the tip of the half portion. The connecting bar 20 is inserted into the through-hole.

The connecting bar 20 has threaded portions 21 at both ends thereof, and the tightening nut 23 can be fastened to the threaded portion. The both ends of the connecting bar 20 are inserted into the through grooves 16 of the half portion 11 laterally of the end plates 10 coupled to the roll land portion 4 of each cut slice 3, By fastening the tightening nut to both ends of the connecting bar, the fastening device 1 according to the present invention is installed to the cutting-off roll.

A step portion 22 for limiting the movement of the end plate 10 may be formed at one side of the threaded portion 21 of the connecting bar 20, but the present invention is not limited thereto, .

Moreover, the mounting of the connecting bar 20 to the end plate 10 is not necessarily limited to the example described above.

On the other hand, the fixing device 1 according to the present invention is provided between the cutting roll and the roll located below the cutting roll when the cutting roll 2 is pulled out, so as to prevent horizontal holding and movement of the cutting roll, (30). ≪ / RTI >

The gap liner 30 is made of a heat-resistant material such as urethane or wood, and may have a substantially hexahedral shape having a curved surface 31 at least on one side. However, the gap liner 30 is not limited thereto. It is preferable to provide a plurality of gap liner having various sizes, particularly various thicknesses.

A description will now be made of a method of pulling out the cutting roll using the fixing device according to the present invention constructed as described above.

FIG. 3 is a view showing a method of pulling out the cutting roll when the upper rolling roll is cut using the fixing device of the present invention, and FIG. 4 is a view showing a state where the lower rolling roll is cut off Fig. 7 is a view showing a method of withdrawing a roll. Fig.

As shown in these drawings, the cutting-off roll taking-out method according to the present invention comprises the steps of: mounting the above-described fixing apparatus 1 on the cutting-off roll 2; And a step of pulling the cut-off roll from a rolling mill (not shown).

Here, the maintenance of a conventional roll is performed by By separating the rolls from the roll stand of the rolling mill together with the roll chocks, and then separating the chocks from both ends of the rolls and restoring them by machining or replacing them with new rolls. For this purpose, the rolling mill is provided with an elevating device for raising and lowering the roll, and a guide rail for guiding the wheel provided at the lower part of the roll chock.

In the case where the upper rolling roll (hereinafter referred to as a "cut-off roll") is cut off, an elevating device (not shown) such as a hydraulic cylinder installed in the rolling mill is operated to raise the cutting roll 2 sufficiently. The gap between the upper cut-off roll and the lower roll 8 is measured, and a gap liner 30 of an appropriate size is inserted and positioned between these rolls.

The upper cut-off roll 2 is lowered to hold the slices 3 cut by the lower rolling roll 8 and the gap liner 30, and to support the slices so as not to move left and right.

Next, the end plate 10 of the fixing device 1 of the present invention is engaged with the roll land portion 4 of each cut film 3. After the end portions of the connecting bars 20 are inserted into the through grooves 16 of the end plates laterally of the end plates, the fastening nuts 23 are fastened to the threaded portions 21 formed at both ends of the connecting bars.

This completes the installation of the fastening device 1 according to the present invention in the cutting-off roll 2. Since the plurality of connecting bars 20 support the slices in contact with the outer circumferential surface of each sliced slice 3 along the longitudinal direction of the slicing roll, the slices of the slicing roll can not move vertically or horizontally, The parallelism is maintained.

In this state, the cutting-off roll 2 on the upper side and the rolling roll 8 on the lower side are pulled out together from the rolling mill using an elevating device or the like provided on the rolling mill. At this time, the roll chocks 5 'to which the slice 3 of the cut-off roll is connected are respectively seated on the both roll chocks 5 to which the lower rolling roll is connected, and the wheels 6 provided on both roll chocks of the lower rolling roll And travel along the guide rails 7. Therefore, the cutting-off roll can be stably moved and pulled out while being placed on the lower rolling roll.

Next, when the lower rolling roll (hereinafter, referred to as a cut-off roll) is cut off, an elevating device (not shown) such as a screw jack installed in the rolling mill is operated to lower the backup roll sufficiently. The gap between the upper cutting-off roll 2 and the lower backup roll 9 is measured, and a gap liner 30 having an appropriate size is inserted between these rolls and positioned.

The backup roll 9 on the lower side is raised so as to keep the slices 3 cut by the backup roll and the gap liner 30 on the lower side and to support the slices so as not to move left and right.

Next, the end plate 10 of the fixing device 1 of the present invention is engaged with the roll land portion 4 of each cut film 3. After the end portions of the connecting bars 20 are inserted into the through grooves 16 of the end plates laterally of the end plates, the fastening nuts 23 are fastened to the threaded portions 21 formed at both ends of the connecting bars.

This completes the installation of the fastening device 1 according to the present invention in the cutting-off roll 2. Since the plurality of connecting bars 20 are held in contact with the outer circumferential surface of each cut slice 3 along the longitudinal direction of the cut-off roll, the slices of the cut-off roll can not move vertically or horizontally, .

In this state, the upper cutting-off roll 2 and the lower backup roll 9 are taken out together from the rolling mill by using an elevating device or the like provided on the rolling mill. At this time, the roll chocks 5 'to which the slices 3 of the cut-off rolls are connected are respectively seated on both roll chocks 5 to which the backup roll at the lower side is connected, and the wheels 6 provided at both roll chocks of the lower backup roll And travel along the guide rails 7. Therefore, the cutting roll can stably move and be pulled out while being placed on the backup roll on the lower side.

As described above, according to the present invention, since the time required for restoring the cut pieces of the cut-off rolls to a horizontal state and connecting them to each other to take out the cut-off roll can be greatly reduced, the rest period is shortened, It is possible to improve the performance.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

1: Fixing device 2: Cutting roll
4: roll land portion 5, 5 ': roll choke
6: wheel 7: guide rail
10: end plate 11: half
12: concave groove 13:
14: Through hole 15:
16: through groove 20: connecting bar
21: threaded portion 23: tightening nut
30: gap liner

Claims (12)

A pair of end plates respectively coupled to the roll land portions;
A plurality of connection bars connecting the end plates through the connection plates and having threaded portions at both ends thereof; And
And a fastening nut fastened to both ends of the connecting bar passing through the end plate
Lt; / RTI >
Wherein the end plate includes a pair of half portions formed at one end of the concave groove, and at least one through-hole opened to the tip of the half portion is formed around the concave groove of the half portion, . delete The method according to claim 1,
And a coupling portion is provided on one side surface of the half portion. The method of claim 3,
Wherein at least one through hole is formed in the coupling portion,
Wherein bolts are inserted into the through holes corresponding to the half portions when the half portions are assembled and the nuts are fastened. delete The method according to claim 1,
And a gap liner interposed between the cut-off roll and a roll located under the cut-off roll. A method for manufacturing a cutting apparatus, comprising the steps of: installing a fixing device according to any one of claims 1, 3, 4, and 6 on a cutting-off roll;
Inserting a gap liner between the ablation roll and a roll located below the ablation roll; And
And a step of pulling out the roll located under the cutting-off roll together
Wherein the take-up roll is pulled out. 8. The method of claim 7,
Further comprising a step of raising and lowering the cut-off roll. 8. The method of claim 7,
Further comprising a step of raising and lowering a roll located under the cut-off roll. delete 8. The method of claim 7,
Wherein the step of installing the fixing device on the cutting-
Joining the end plates to both roll land portions of the cut-off roll; And
And connecting the end plate to the connection bar. delete
KR1020150125040A 2015-09-03 2015-09-03 Apparatus for fixing damaged roll and method for drawing damaged roll using same KR101726070B1 (en)

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KR1020150125040A KR101726070B1 (en) 2015-09-03 2015-09-03 Apparatus for fixing damaged roll and method for drawing damaged roll using same

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KR101726070B1 true KR101726070B1 (en) 2017-04-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102208907B1 (en) * 2020-09-03 2021-01-28 주식회사 솔리드테크 An apparatus for centering rolling roll

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200270881Y1 (en) * 2001-12-18 2002-04-06 주식회사 포스코 Apparatus for drawing a damaged roll in a rolling stand
JP2012152077A (en) * 2011-01-21 2012-08-09 Mitsuba Corp Positioning device and electric motor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101344957B1 (en) * 2011-10-31 2013-12-24 현대제철 주식회사 Idle gear assemble jig for decelerator of Rolling equipment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200270881Y1 (en) * 2001-12-18 2002-04-06 주식회사 포스코 Apparatus for drawing a damaged roll in a rolling stand
JP2012152077A (en) * 2011-01-21 2012-08-09 Mitsuba Corp Positioning device and electric motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102208907B1 (en) * 2020-09-03 2021-01-28 주식회사 솔리드테크 An apparatus for centering rolling roll

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KR20170028507A (en) 2017-03-14

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