KR101652822B1

KR101652822B1 - Leveller for ultra high strength steel sheet

Info

Publication number: KR101652822B1
Application number: KR1020150108547A
Authority: KR
Inventors: 박인회
Original assignee: 영림기계 (주)
Priority date: 2015-07-31
Filing date: 2015-07-31
Publication date: 2016-09-09

Abstract

The present invention relates to a leveler for an ultra-high strength steel (UHSS) sheet capable of drawing a steel plate from a steel plate coil and removing a curvature and a flatness defect, comprising: an introduction unit having a loop guide adjusting a lead-in angle of a steel plate, and a guide roller adjusted in a transverse interval in accordance with the led-in steel plate; a pinch roll unit having a lower fixated roll supporting the steel plate transferred from the introduction unit, and an upper pinch roll applying an adjusted previous rolling reduction to the steel plate passing therethrough; a leveling unit having a plurality of upper working rolls and lower working rolls disposed to vertically be spaced apart from the steel plate transferred from the pinch roll unit, a plurality of upper middle rolls and lower middle rolls transmitting a rolling reduction to the upper working rolls and the lower working rolls, and a plurality of upper backup rolls and lower backup rolls applying a rolling reduction required to level the steel plate to the upper middle rolls and the lower middle rolls; and a drawing unit having a lower guide and an upper guide each having guide rollers adjusted in a transverse interval in accordance with the steel plate transferred from a leveling unit. As such, the leveler for a UHSS sheet appropriate to level a UHSS sheet having a tensile strength of 80 kgf/mm^2 grade or higher is able to be provided.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high-

More particularly, the present invention relates to a calibrator for ultra-high-strength steel sheet suitable for calibrating ultra-high-strength steel sheet having a tensile strength of 80 kgf / mm ² or more, and more particularly to a calibrator for removing a curvature and removing a flatness defect, .

In general, leveling of a steel sheet is a process for solving the problem of flatness defect occurring in a production process or a transportation process of a steel sheet (curvature occurs due to conveyance in a coil state), and the calibration process is a process of preparing a material And as the strength of the steel plate increases, the springback of the plate becomes larger, so that the degree of difficulty of the calibration increases sharply.

Especially, according to the demand forecast of global automotive steel plate due to the competition of high safety and low fuel consumption of automobiles in recent years, market share of Advanced High Strength Steel (AHSS) or Ultra High Strength Steel (UHSS) of 60 to 160 [kgf / mm ² ] Is expected to rise sharply (Source: Evolution of Advanced High Strength Steels in Automotive Application, 2011).

However, the number, arrangement and deformation of the calibration rolls should be optimized for the calibration of ultra high tensile steel plates. However, it is a reality that domestic technical experience is insufficient for the calibration of ultra high tensile steel plates of 80kg or more.

At present, there is a rapid increase in the demand for a high-strength steel plate for a high-precision steel plate in a global automobile production base including China. These are: a) a high accuracy of calibration accuracy of 0.5 [mm] or less based on 550 [mm] b) a calibration speed of 14 [m / sec] or more is required.

On the other hand, the following technical barriers exist in the development of a calibrator for an ultra high tensile steel sheet satisfying the above requirements.

First, it is very difficult to predict the correct calibration behavior because it is very difficult to control the springback of the ultra high tensile steel sheet.

Therefore, it is difficult to determine equipment specifications such as the set range of the reduction amount of the calibrating roll, the interval of the rolls, the curvature of the roll, and the like.

In addition, it is necessary to optimize the equipment structure to prevent degradation of calibration quality due to deformation of rolls occurring during calibration.

[Prior Art Literature]

US Patent No. 6,240,762 (registered on June 5, 2001)

U.S. Patent Application Publication No. 2011/0138868 (Published Date: June 16, 2011)

Accordingly, it is an object of the present invention to provide a calibrator for a high-tensile steel sheet suitable for calibrating an ultra-high-strength steel sheet having a tensile strength of 80 kgf / mm < ² >

According to an aspect of the present invention, there is provided a calibrator for an ultra-high strength steel plate, comprising: a loop guide having a pull angle of a steel plate adjusted around a rotation axis; An input unit having a pair of guide rollers; A pinch roll having an upper pinch roll for adding a regulated pre-reduction amount to a passing steel plate by adjusting a distance between the fixing roll and the fixing roll, A roll unit; A plurality of upper work rolls and lower work rolls arranged at upper and lower intervals along the conveying direction of the steel plate passed through the pinch roll unit, upper and lower work rolls disposed at lower portions of the upper and lower work rolls, A plurality of upper and lower intermediate rolls for transmitting a reduction amount to the lower work roll, a lower intermediate roll disposed at an upper portion of the upper intermediate roll and a lower portion of the lower intermediate roll, A leveling unit having a plurality of upper backup rolls and a lower backup roll for adding a necessary reduction amount to the lower backup rolls; And at least a pair of guide rollers whose widthwise intervals are adjusted in accordance with the steel plate passed through the leveling unit so as to guide the steel plate in an inclined downward direction, And a pull-out unit having at least a pair of guide rollers, the guide rollers being adjustable in height and guiding the steel plate so as to be inclined upward in the upward direction.

The calibrator for an ultra high tension steel plate may further include a plurality of universal joints installed at one side in the width direction of the leveling unit and connected to the plurality of upper backup rolls and the lower backup rolls, And a gear box unit having a gear train for transmitting rotational power between the plurality of universal joints and the drive motor.

The gear box unit further includes a shaft rotated by the driving motor via a belt and an independent universal joint axially coupled with the shaft, and the pinch roll of the pinch roll unit is connected to the independent universal joint And may be rotationally driven by the shaft.

The leveling unit includes an upper support rotatably supporting the upper work roll, the upper intermediate roll, and the upper backup roll, and a lower support roll rotatably supporting the lower work roll, the lower intermediate roll, A lower frame for supporting the lower support, a plurality of jackscrew columns for adjusting the vertical movement of the upper frame relative to the lower frame, Further comprising a motor for driving the plurality of jackscrew columns through an electric element.

As described above, according to the present invention, it is possible to provide a calibrator for an ultra high tensile strength steel sheet suitable for calibrating an ultra high strength steel sheet having a tensile strength of 80 kgf / mm ² or more.

1 is a front view of a calibrator for an ultra high tension steel plate according to an embodiment of the present invention,
2 is a plan view of the calibrator for the ultra high tension steel plate of FIG. 1,
3 is an enlarged view of a main portion of the bracket for the ultra high-strength steel plate shown in Fig. 1,
Fig. 4 is a perspective view of the input unit, which is one component of the calibrator for the ultra high tension steel plate of Fig. 1,
Fig. 5 is a perspective view of a pinch roll unit, which is a component of the calibrator for the ultra high tension steel sheet of Fig. 1,
FIG. 6 is a perspective view of a main part of the leveling unit, which is a component of the calibrator for an ultra high-strength steel plate of FIG. 1,
FIG. 7 is a perspective view showing only the main portion of the leveling unit of FIG. 6,
8 is a perspective view of a gear box unit which is a component of the calibrator for the ultra high-strength steel plate of Fig. 1, Fig.
9 is a perspective view of a main part of the gearbox unit of FIG. 8,
10 is a perspective view showing only a main portion of a drawing unit, which is one component of a calibrator for an ultra high-strength steel plate shown in Fig.

1 and 2, the calibrator 10 for an ultra-high strength steel plate according to the embodiment of the present invention is a calibrator for an ultra high tension steel plate, And a gear box unit 500 including a pinch roll unit 200, a leveling unit 300 and a takeout unit 400 and installed parallel to the leveling unit 300 at regular intervals.

The input unit 100 includes a loop guide 103 which is rotatably provided around a rotary shaft 102 at one end by a hydraulic cylinder 101 as shown in Fig. Thus, the angle guide loop guide 103 supports the steel sheet fed from the steel roll 1 through the upper surface thereof to be transported.

The steel sheet passing through the loop guide 103 is aligned and conveyed in a state in which both end portions in the width direction are supported by a pair of guide rollers 104 and 105 provided respectively at the front and rear sides.

The widthwise spacing of the pair of guide rollers 104, 105 is adjusted by the handles 106, 107.

5, the pinch roll unit 200 includes a lower fixing roll 201 and an upper pinch roll 203 which is vertically adjusted by the pneumatic cylinder 202. [

The steel plate passed through the input unit 100 passes through the upper portion of the stationary roll 201. At this time, by the pinch roll 203 whose distance from the stationary roll 201 is adjusted by the pneumatic cylinder 202 It is possible to add a pre-reduction amount necessary for constantly inputting the leveling unit 300 to the steel plate.

The rotational driving of the pinch roll 203 is performed by a gear box unit 500 connected via an independent universal joint (see Figs. 2 and 7) as described later.

3, the leveling unit 300 includes a plurality of upper work rolls 301 and lower work rolls 302 arranged at upper and lower intervals, upper and lower work rolls 301 A plurality of upper backup rolls 303 disposed at the lower portion of the upper intermediate roll 303 and a lower intermediate roll 304 disposed at the lower portion of the upper intermediate roll 303, 305 and a lower back-up roll 306.

The upper and lower work rolls 301 and 302 perform substantial contact rolling with respect to the steel plate passing between the upper and lower work rolls 301 and 302. The upper and lower backup rolls 305 and 306 are used to adjust the amount of reduction required for calibrating the steel plate, And the upper and lower intermediate rolls 303 and 304 serve as intermediaries for transferring the amount of reduction provided by the backup rolls 305 and 306 to the work rolls 301 and 302. [

As shown in Fig. 3, both the upper work roll 301, the upper intermediate roll 303 and the upper backup roll 305 are rotatably supported by the upper support 307 at both ends of the shaft of the roll. Similarly, both the lower work roll 302, the lower intermediate roll 304 and the lower backup roll 306 are rotatably supported by the lower support 308 at both ends of the shaft of the roll.

Further, the upper support 307 is supported by the upper frame 309, and similarly, the lower support 308 is supported by the lower frame 310.

6 and 7, the upper and lower supports 307 and 308 are supported by the upper and lower frames 309 and 310, respectively, (311) and a motor (312).

For this purpose, each of the jack screw columns 311 has its lower end rotatably coupled to the four pillars of the lower frame 310, and the elevation portion 313 of the jack screw column 311 is connected to the four sides of the upper frame 309 And is fastened through the corners.

Generally, the jack screw column 311 is raised and lowered by a screw formed on the column when the elevator 313 is driven as a worm gear. Thus, lifting and lowering of the upper frame 309, which is integrally coupled with the lifting and lowering by the rotation of the lifting unit 313, is achieved, so that the gap between the upper support 307 and the lower support 308 is adjusted.

The motor 312 is mounted on the upper surface of the upper frame 309 and rotationally drives the worm gear on the side of the lift portion 313 through a chain (not shown).

On the other hand, the rotary drive of the upper and lower work rolls 301 and 302 is achieved by the gearbox unit 500, as shown in Figs. 2 and 8.

The gear box unit 500 includes a drive motor 501 for providing rotational power and a gear train 502 for distributing the rotational force of the drive motor 501 to the work rolls 301 and 302 Respectively.

A plurality of input shafts 503 corresponding to the upper and lower work rolls 301 and 302 are provided on the output side of the gear train 502. These input shafts 503 are respectively connected to the input shaft 503 via a universal joint 504 And is connected to the lower work rolls 301 and 302 on the side of the leveling unit 300 adjacent thereto.

Further, the gear box unit 500 further includes a shaft 505 rotated by a drive motor 501 through a belt (not shown), and an independent universal joint 506 (not shown) is attached to one end of the shaft 505 And the pinch roll (203 in FIG. 5) on the side of the pinch roll unit (200 in FIG. 2) described above is rotationally driven.

The steel sheet having passed through the leveling unit 300 as described above is conveyed to a draw-out unit 400 installed adjacent thereto (see FIGS. 1 and 2).

The drawing unit 400 includes a downward guide 410 through which the steel plate passed through the leveling unit 300 is inserted and an upward guide 420 which guides the steel plate passed through the downward guide 410 and discharges it to the outside.

As shown in FIG. 10, the downward guide 410 and the upward guide 420 are provided with at least a pair of guide rollers 411 and 421 whose widthwise intervals are adjusted in accordance with the steel sheet passing through the downward guide 410 and the upward guide 420.

The guide rollers 411 and 421 are controlled by a handle (not shown in FIG. 4, refer to 106 in FIG. 4) provided on one side 412 in the same manner as the guide rollers 104 and 105 on the side of the input unit do.

It is difficult to understand that the scope and technical scope of the present invention are limited to those described above because the calibrator 10 for ultra high tension steel sheet described above is only one embodiment for facilitating understanding of the present invention.

The scope of the present invention is defined by the appended claims and their equivalents.

10: Calibrator for ultra high tensile steel plate 100: Input unit
103: loop guide 104, 105: guide roller
200: Pinch roll unit 201: Fixing roll
203: Pinch roll 300: Leveling unit
301: upper work roll 302: lower work roll
303: upper intermediate roll 304: lower intermediate roll
305: Upper backup roll 306: Lower backup roll
307: upper support 308: lower support
309: upper frame 310: lower frame
311: Jack screw column 312: Motor
313: elevating part 400: withdrawing unit
410: downward guide 411, 421: guide roller
420: Upward guide 500: Gear box unit
501: drive motor 502: gear train
503: input shaft 504: universal joint
505: shaft 506: independent universal joint

Claims

A calibrator for an ultra high tensile steel plate,
A loop guide for adjusting a pulling angle of the steel plate around a rotation axis of the pair of rollers and at least a pair of guide rollers whose width direction is adjusted in accordance with the steel plate introduced through the loop guide;
A pinch roll having an upper pinch roll for adding a regulated pre-reduction amount to a passing steel plate by adjusting the distance between the fixing roll and the fixing roll, A roll unit;
A plurality of upper work rolls and lower work rolls arranged at upper and lower intervals along the conveying direction of the steel plate passed through the pinch roll unit, upper and lower work rolls disposed at lower portions of the upper and lower work rolls, A plurality of upper and lower intermediate rolls for transmitting a reduction amount to the lower work roll, a lower intermediate roll disposed on the upper portion of the upper intermediate roll and below the lower intermediate roll, A leveling unit having a plurality of upper backup rolls and a lower backup roll for adding a necessary reduction amount to the lower backup rolls; And
And at least a pair of guide rollers whose widthwise intervals are adjusted in accordance with the steel plate passed through the leveling unit so as to guide the steel plate in an inclined downward direction, And an upward guide provided with at least a pair of guide rollers to be adjusted so as to guide the steel plate so as to be inclined upwardly.

The method according to claim 1,
A plurality of universal joints installed at one side in the width direction of the leveling unit and connected to the plurality of upper backup rolls and the lower backup rolls respectively; a driving motor for providing rotational power to the plurality of universal joints; Further comprising a gear box unit having a gear train for transmitting rotational power between the joint and the drive motor.

3. The method of claim 2,
The gear box unit
A shaft rotated by the driving motor via a belt, and an independent universal joint axially coupled with the shaft,
And the pinch roll of the pinch roll unit is connected to the independent universal joint and is rotationally driven by the shaft.

The method according to claim 1,
The leveling unit
A lower support body rotatably supporting the plurality of lower work rolls, the lower intermediate roll and the lower backup roll, and a lower support body rotatably supporting the upper work roll, the upper intermediate roll, and the upper backup roll, A lower frame for supporting the lower support, a plurality of jackscrew columns for adjusting the vertical movement of the upper frame relative to the lower frame, and a plurality of jackscrew columns mounted on the upper frame, Further comprising a motor for driving the plurality of jackscrew columns.