KR100782713B1 - An apparatus for bending the top of strip - Google Patents

Abstract

The present invention relates to an apparatus for bending a steel sheet tip.

The present invention includes a main body frame 9 installed on a pass line of a steel plate, and upper and lower electrodes 11 and 12 that generate heat when power is applied to the inlet side of the main body frame 9, and the upper electrode 11 Heating to facilitate bending bending of the front end portion of the steel plate held between the upper and lower electrodes 11 and 12 by having a first cylinder 13 for moving the lower electrode 12 to the fixed lower electrode 12. Part 10; The upper and lower presses 33 and 34 are rotatably assembled with the upper and lower elbows 31 and 32 in the main body frame 9, and the upper press 33 is fixed to the lower press ( A press unit (30) having a second cylinder (35) to be moved relative to the 34) to press and bend the steel sheet tip disposed between the upper and lower bend elbows (31) (32); Including a spray pipe 51 for injecting the cooling fluid supplied to the outlet side of the main body frame 9 on the steel plate surface in the width direction of the steel plate, including a cooling unit 50 for cooling the bent steel sheet tip end portion. , By bending the steel sheet cutting part cut by the thickness by thickness to prevent the end mark transferred to the steel plate surface by the steel sheet tip when winding the steel sheet, the effect of improving the quality of the steel sheet product is obtained.

Steel plate, inflection, upper and lower electrode, upper and lower press, injection tube

Description

Steel plate tip bending device {AN APPARATUS FOR BENDING THE TOP OF STRIP}

1 is a schematic view showing a general steel sheet winding equipment,

Figure 2 is an installation state showing the steel plate front end bending device according to the present invention,

Figure 3 is an overall perspective view showing a steel sheet front end bending device according to the present invention,

Figure 4 is an exploded perspective view showing a heating portion employed in the steel sheet front end bending device according to the present invention,

Figure 5 (a) (b) is an exploded perspective view showing a press portion employed in the steel sheet end portion bending apparatus according to the present invention,

Figure 6 is a flow showing the operation of the steel sheet front end bending device according to the present invention.

        Explanation of symbols on the main parts of the drawings

11,12 ... upper and lower electrodes 13 .... 1st cylinder

14,15 ... upper and lower insulation plates 21 .... Earth pad

22,57 ... idle roll 23 .... operating bar

31,32 ... upper and lower inflection elbows 33,34 ... upper and lower presses

35 .... 2nd cylinder 35,36 ... upper and lower motor

41,42 .... Upper and lower detection bar 43,44 ... 1st, 2nd sensor member

51 .... injection pipe 53 .... regulating valve member

The present invention relates to an apparatus for bending the front end of a steel sheet, and more particularly, to the end of the steel sheet winding by cutting the thickness of the trailing steel sheet front end cut by the cutter so as to prevent the end mark transferred to the steel surface by the steel sheet front end during winding The present invention relates to a steel sheet leading end bending device capable of improving the quality of steel sheet products by preventing end marks transferred to the steel sheet surface by the leading ends.

In general, a rolled steel sheet is wound and rolled into a coil of a roll using a winder (4) in order to be shipped at a width and weight required by the demand. As shown in FIG. The steel sheet has a rolled coil in the winding direction (2) and the cutting machine (3) in one direction and passes through the deflector roll (4a) in the winding machine (4), and the coil is wound to the order demand of the demand When the length of the steel sheet is automatically converted and the split length approaches, the speed of the steel sheet line is reduced, and when the correct split length position is reached, all the equipment on the steel sheet line is stopped and the cutter 3 is operated to cut the steel sheet. . Subsequently, the tail end of the cut preceding steel sheet is wound up in the winder 4 through the deflector roll 4a and then transported and shipped from the coil drawn out from the winder 4.

After the process is completed, the trailing steel sheet is cut into the winding machine (4) through a steel plate guide table (not shown) to restart the winding operation, by repeating this process to produce a variety of products required by the demand Will be shipped.

However, when the winding steel sheet cut by the cutter (3) is wound on the winder (4) by the product thickness step of the steel sheet end cut at right angles in the cutting operation during the initial winding operation of winding the winder (4), End mark (M) such as bending occurs in the stepped portion between the winding surface, there was a problem to lower the quality of the steel sheet product. This is because the steel sheet is smaller in thickness, softer and inner diameter, the higher the occurrence rate.

In order to remove the end mark (M) generated as described above must be reworked, and if the grind test, the defect caused by the on-line mark is generated and eventually the steel sheet product must be scraped. As a result, the work productivity is remarkably lowered by reworking to remove the end mark M generated on the surface of the steel sheet, and fine bending is not confirmed by the self-weighted pressing on the side of the wound coil. There was a problem such as a reason for the complaint and complaint from the demand price.

Therefore, in the past, a device for guiding the end portion of the groove on the drum surface of the winder in order to remove the end mark M was introduced to the groove during the initial winding of the steel sheet. The work of inducing the steel plate front end is very cumbersome and takes a long time. In addition, there is also a method of tapering the end of the steel sheet, which has a problem that the dent due to the cutting chip is generated, the oil chip due to the oil oil on the surface of the steel sheet is not removed.

In addition, a method of attaching the buffer tape to the steel sheet tip is also used, but there is a problem that a defect occurs in a later step by the tape attached.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, the object of which is to give the inflection by thickness for the cutting surface of the trailing steel sheet end portion cut in the cutter, the thickness step when the steel sheet end portion is rewound in the winder It is an object of the present invention to provide a steel sheet leading edge bending device for preventing the occurrence of end marks due to bending between winding surfaces.

As a technical configuration for achieving the above object, the present invention,

In a winding apparatus for cutting a rolled steel sheet in a cutter and wound in a roll form in a winder,

A main body frame installed on a pass line of the steel sheet;

The upper and lower electrodes which generate heat when the power is applied to the main body frame, and the first cylinder for moving the upper electrode with respect to the fixed lower electrode, and the front end portion of the steel plate bitten between the upper and lower electrodes Heating unit for heating to facilitate bending bending;

The upper and lower inclined elbows are rotatably assembled in the main body frame, and have a second cylinder that swings the upper presses relative to the fixed lower presses. A press unit for bending the deformed steel plate tip by bending;

A steel sheet distal end deflection device is provided, comprising a cooling unit for cooling the steel sheet distal end portion having a spray pipe for injecting the cooling fluid supplied to the outlet side of the main frame onto the steel sheet in the width direction of the steel sheet. By

Hereinafter, the present invention will be described in more detail with reference to the drawings.

Figure 2 is an installation state diagram showing the steel sheet front end bending device according to the present invention, Figure 3 is an overall perspective view showing the steel sheet front end bending device according to the present invention, Figure 4 is employed in the steel sheet front end bending device according to the present invention 5 (a) and (b) are exploded perspective views showing a press part employed in the steel sheet front end bending device according to the present invention, and FIG. 6 shows the operation of the steel sheet front end bending device according to the present invention. This is the flow shown.

The apparatus 1 of the present invention, as shown in Figs. 2 to 6, winding the end portion of the steel sheet cut by the cutter 3 in accordance with the thickness of the steel sheet downward bending deformation of the coil winding in the form of a winding machine (4) In order to prevent the occurrence of the end mark (M) due to the step of the steel sheet leading end during the work is installed on the exit side of the cutter 3, such a device (1) is the body frame (9), heating section (10) And a press section 30 and a cooling section 50.

That is, the main body frame 9 is a fixing member installed in the width direction of the steel sheet in the pass line of the steel sheet, the upper portion of the "c" shaped cross-sectional structure formed with a plurality of guide holes (8a, 8b) on both sides It consists of the base 9a and the lower base 9a fixed to the bottom surface, and the entrance and exit sides are opened.

In addition, the heating unit 10 for heating before pressing the front end portion of the steel sheet to facilitate bending deformation is provided with upper and lower heat transfer plates (11, 12) to generate heat when the power is applied to the mouth of the main body frame (9), The upper electrode 11 is the upper base 9a of the main body frame 9 so as to be movable so as to narrow the gap with respect to the lower electrode 12 fixed to the lower base 9b of the main body frame 9. It is assembled so as to be movable in and coupled to the rod end of the plurality of first cylinder 13 is fixed to the upper surface of the upper base.

The upper and lower electrodes 11 and 12 are replaceably assembled as a plurality of bolt members 14a and 15a on the upper and lower surfaces of the upper and lower heat transfer plates 14 and 15 made of an insulator, and external power source. The connectors 16a and 16b connected to the supplied power cables are connected to one end of each of the upper and lower electrodes 11 and 12.

In this case, the upper insulating plate 14 is vertically installed on the upper surface of the upper base 9a and assembled through the connector 13a so as to be easily attached to and detached from the rod end of the first cylinder 13 penetrating therethrough. The lower insulating plate 15 is fixed to the upper surface of the lower base 9b by a plurality of fixing bolts 15b, and both left and right ends of the upper insulating plate 11 are disposed on the left and right sides of the upper base 9a. It is assembled to the upper and lower flow in the guide hole (8a) formed.

In addition, an earth portion 20 is provided at an inlet side of the heating unit 10 so as to prevent external power applied during the heating operation of the steel plate front end to the other equipment side. During the heating operation of the steel plate front end, the earth pad 21 is brought into contact with the lower surface in the width direction to energize external power to the ground, the idle roll 22 rotated to guide the one-way progression of the steel plate, and the earth pad ( 21 is mounted on one side and the idler roll 22 is mounted on the other side via the operation bar 23 of the rectangular cross section, the upper link 23a and the pin member 23c of the operation bar. The rod lowering cylinder 27, which is configured to connect the lower link 23b, which is diffrably assembled to the rod end, and the rod end of the cylinder 27 are penetrated, and one end is fixed to the left and right ends of the operation bar 23. The other end of the fixed link (25a) (25b) is connected to the rod end Consists of a fixed-time base 26 of the cylinder 25 is fixed to the left and right ends.

Here, the fitting jaw 21a formed on the lower surface of the pad 21 is inserted into the fitting groove 24a of the pad fixing base 24, and one end of the fitting groove 24a is the pad fixing base. The bearing block 22a which is sealed to the stopper 24b fastened to the 24 as the bolt member 24c and rotatably supports the left and right ends of the idle roll 22 is one side of the operation bar 23. The bar turning cylinder 25 is fixed by a fixing band 25b fastened as a bolt member 25c on both left and right sides of the fixing base 26 while being fixed as a bolt member 22b.

In addition, the press portion 30 for bending and deforming by pressing the end of the steel sheet heated in the heating section 10 has the upper and lower curved elbows 31 and 32 in the width direction of the steel plate in the body frame (9). The upper and lower presses 33 and 34 are provided, and the upper press 33 is configured to narrow the upper and lower intervals with respect to the lower press 34 fixed to the lower base 9b of the main body frame 9. It is assembled to the upper base (9a) of the main body frame 9 so as to be movable and connected to the rod end of the plurality of second cylinders 35 fixedly installed on the upper surface of the upper base (9a).                     

Here, the upper press 33 has a shaft hole (33a) that is rotatably accommodated the upper inflexion elbow 31 formed of a plurality of inclusions in the circumferential direction of the concave portion 31a of the arc-shaped cross section having a different radius of curvature, and the recess ( An opening 33b cut in the longitudinal direction is formed at one corner so that 31a) is exposed to the outside, and the lower press 34 has a lower portion in which a plurality of convex portions 32a of arc cross sections having different radii of curvature protrude in the circumferential direction. A shaft hole 34a in which the inflexible elbow 32 is rotatably received, and an opening 34b cut in the longitudinal direction so that the convex portion 32a is exposed to the outside in correspondence with the recess 31a are formed at one corner. Each of the rotary shafts 31b and 32b of the upper and lower curved elbows 31 and 32 has a concave portion 31a and a convex portion 32a having the same radius of curvature with each other through the openings 33b and 34b. Upper and lower parents mounted on the upper and lower presses 33 and 34 so as to correspond. 35 is configured rotatably connected by the driving force of 36.

Accordingly, the upper and lower motors 35 and 36 fixed to one side end of the upper and lower presses 33 and 34 have rotational power toward upper and lower bending elbows 31 and 32. Drive sprockets 37a and 38a of each drive shaft are connected to one end of each of the rotary shafts 31b and 32b of the upper and lower inflexible elbows 31 and 32 so as to be transmitted. It is connected to the driven sprockets 37c and 38c mounted as the key members 37d and 38d, while being able to detect the rotational amounts of the upper and lower motors 35 and 36 so as to be able to detect the rotation of the upper and lower motors 35a and 36a. ) And have each.

The other ends of the upper and lower curved elbows 31 and 32 may detect positions of a plurality of recesses 31a and convex portions 32a having different radii of curvature at the other ends of the rotary shafts 31b and 32b. The plurality of upper and lower sensing bars 41 and 42 sensed by the first and second sensor members 43 and 44 mounted on the upper and lower curved elbows 31 and 32 are provided with the plurality of concave and convex parts. (31a) (32b) is mounted on the position corresponding to, while the upper and lower presses elbows (31, 32) are mounted on the upper and lower presses (33, 34) to detect the end of the steel sheet entering between The stopper 47 is pivotally operated by the detection signals of the 3 and 4 sensor members 45 and 46.

Here, the left and right ends of the rotating shaft 31b of the upper bending elbow 31 is supported by a bearing block 39 having a bearing member 39a, and the bearing block 39 is formed on both sides of the upper press 33. Is mounted as a bolt member, and the upper and lower sensing bars 41 and 42 are fixed as bolt members 41b and 42b to be rotated together with the upper and lower inflexible elbows 31 and 32. Sensors mounted on the plates 41a and 42b, and the first and second sensor members 43 and 44 are also fixed to the upper and lower presses 33 and 34 as bolt members 43b and 44b. It is attached to the brackets 43a and 44a.

The rod end of the second cylinder 35 having a larger pressing force than the first cylinder 13 is assembled to the connector 35a provided on the upper surface of the upper press 33, and the bearing block 39 is provided. It is preferable to provide a space ring 39c on the inner side of the.

On the other hand, the cooling unit 50 for cooling the steel sheet front end portion bent between the upper and lower inflection elbows 31 and 32 of the upper and lower presses 33 and 34 is cooled to the exit side of the main frame 9. The injection pipe 51 to which the fluid is supplied is installed in the width direction of the steel plate, and the left and right ends of the injection pipe 51 are fixed to the upper base 9a as a fixing band 54, and one side end thereof is It is connected via a supply line 52 for supplying a cooling fluid and a control valve member 53, and a plurality of nozzles are provided on the outer surface so that the cooling fluid can be sprayed onto the surface of the bent steel plate after heating. Install the gap.

Here, the cooling gas injected from the nozzle of the injection pipe 51 may selectively use an inert gas such as air or nitrogen, but is not limited thereto.

In addition, the exit side of the main body frame 9 is guided to the front surface of the lower base (9b) to support the pass line of the steel plate which proceeds in one direction toward the winding machine (4) which is a later process while passing through the cooling unit (50). The base 55 is installed, and the guide cylinder 56 through which the rod end vertically passes is provided with an idle roll 57 driven by idle rotation.

The operation and effects of the present invention having the configuration as described above will be described.

First, the steel sheet is cut by the cutting machine (3) and the preceding steel sheet is wound in a coil of the reel form in the winding machine (4), then the trailing steel sheet cut in the cutter (3) in one direction, the winding machine (4) side Proceeds to the main frame 9 arranged on the exit side of the cutter (3), at this time, the cylinder for raising and lowering the path 25 is raised to raise the upper and lower links (23a) (23b) of the operation bar (23) Since the initial state is in a vertical state, the idle roll 22 is disposed on the lower surface thereof to contact the outer circumferential surface so as to smoothly advance the steel plate in one direction, while the earth pad 21 is spaced apart.

Subsequently, when the steel plate front end portion is disposed between the upper and lower electrodes 11 and 12 of the heating part 10, the lower cylinder plate 15 in which the upper cylinder plate 14 is fixed while the first cylinder 13 is operated. The lower end of the steel sheet is clamped between the upper and lower electrodes 11 and 12. At this time, when the pad lowering cylinder 25 having the raised initial state is lowered, the upper link 23a pivots about the lower link 23b with the pin member 23c as the upper link 23a. Since the operating bar 23 installed on the circumferentially pivots 90 ° toward the main frame frame 9, the idle roll 22 which is in contact with the lower surface of the steel sheet is spaced apart from the steel sheet, while being in contact with the lower surface of the steel sheet. The earth pad 21 is located at the top.

At the same time, the stopper 47 disposed on the exit side of the lower frame 9b of the main body frame 9 is switched from a horizontal state to a vertical state by a stopper operation cylinder (not shown), so that the steel plate front end further moves forward. Do not

In this state, the upper computer receives the information of the thickness of the steel sheet entered in the previous step, and compares the steel plate thickness data clamped between the upper and lower electrodes 11 and 12 with the steel sheet leading edge inflection value. As shown in Table 1, predetermined current values are determined according to various steel plate thicknesses.

At this time, the current value determined is a value such that only the heating is performed so that the deformation of the steel sheet is not easily melted.

When the current value is determined according to the sheet thickness condition as described above, the DC power is supplied to the upper and lower electrodes 11 and 12 through the connectors 16a and 16b connected to the external power source. + Power is supplied to the upper electrode 11 and-power to the lower electrode 12 to heat the steel sheet front end, wherein the current supplied to the steel sheet side is in contact with the lower surface of the steel sheet. Since it is grounded and flows out through (21), short-circuit can be prevented.

Continuously, when the heating of the steel plate front end is completed by the power supplied for a predetermined time, the power supply through the connectors 16a) and 16b is stopped, and the steel sheet is moved to the next step for the bending process of the steel plate front end. The upper insulating plate 14 is lifted up of the first cylinder 13 so as to proceed to unclamp the steel sheet.

On the other hand, when comparing the information of the thickness of the trailing steel sheet entered for heating the steel sheet end portion and the thickness of the preceding steel sheet which has been inflected in the previous process and then proceeded to the winding machine in the upper computer, the thickness of the preceding steel sheet is not equal to each other. Is thicker than the thickness of the trailing steel sheet, in order to correspond the recesses 31a and the convex portions 32a of the upper and lower inflection elbows 31 and 32 with a larger curvature radius than the previous process according to the thicker steel sheet thickness. When the rotational power source of the upper and lower motors (35) and (36) is transferred to the rotation shafts (31b) and (32b) of the upper and lower inflection elbows (31) and (32) and rotated forward in the forward direction, they have different radii of curvature. The upper and lower inflection elbows 31 and 32 having the concave and convex portions 31a and 32a formed on the outer circumferential surface thereof are engaged with each other in the shaft holes 33a and 34a of the upper and lower presses 33 and 34. That is, it starts to rotate in the direction which advances a steel plate to a winder side.

On the other hand, when the thickness of the preceding steel sheet is thinner than the thickness of the following steel sheet, the recesses 31a and the convex portions 32a of the upper and lower inflection elbows 31 and 32 have a smaller radius of curvature compared to the previous process according to the thinner steel sheet thickness. In order to correspond to each other, by transmitting the rotational power source of the upper and lower motors (35, 36) to the rotary shafts (31b, 32b) of the upper and lower inflection elbows (31) (32) and reversely rotate it in the reverse direction, The upper and lower inflection elbows 31 and 32 having the concave and convex portions 31a and 32a having different radii of curvature on the outer circumferential surface thereof are shaft holes 33a and 34a of the upper and lower presses 33 and 34. It starts to rotate in the direction of engagement with each other, ie, the direction of advancing the steel sheet toward the winding base side.

At this time, the rotation amount of the upper and lower motors (35, 36) is measured by the PEL (36a, 36b) connected to the drive shaft and transmitted to the upper computer side, the PEL (36a, 36b) is The upper and lower motors correspond to each other through the openings 33b and 34b so that the concave portion 31a of the upper inflection elbow 31 and the convex portion 32a of the lower inflection elbow 32 match the plate thickness determined by the upper computer. The amount of rotation of (35) and (36) can also be controlled.

In addition, when the upper and lower curved elbows 31 and 32 are rotated, a plurality of ones installed to correspond to the recessed portions 31a and the convex portions 32a which are formed differently in the circumferential direction on one end of each of the rotation shafts 31b and 32b. The upper and lower sensing bars 41 and 42 are also rotated with this, and are detected by the first and second sensor members 43 and 44 installed in the upper and lower presses 33 and 34, and the detection signal is detected. It is sent to the host computer.

In this case, the main part of the upper and lower inflection elbows 31 and 32 based on the rotation amount of the PlG transmitted to the upper computer and the value detected by the first and second sensors 43 and 44. If the (31a) and the convex portion (32a) has a radius of curvature that can smoothly perform the bending pressure operation in accordance with the plate thickness of the steel sheet, the rotation is stopped and exposed through the openings (33b) 34b to proceed to the next step On the other hand, if they do not coincide, the rotation of the upper and secondary inflexible elbows 31 and 32 continues.

As described above, openings 33b and 34b are formed between the recesses 31a and 34b having the radius of curvature corresponding to the thickness of the steel sheet to be deflected by the rotation stop of the upper and lower bend elbows 31 and 32. In the state facing each other through, the steel plate heated the front end portion in the heating section 10 is the upper and lower inflection elbows (31, 32) at the same time as the unclamping operation according to the rising return of the first cylinder (13) It is moved along the steel plate pass line to enter between the upper and lower presses 33 and 34 having.

Then, when the steel sheet leading part is detected by the third and fourth sensor members 45 and 46 of the upper and lower presses 33 and 34, the stopper 47 which is turned up during the heating operation by the signal is It is turned down to return to a horizontal state, and at the same time, the first cylinder 13 is lowered to clamp the steel plate.

In this state, when the second cylinder 35 installed on the upper side of the main body frame 9 is lowered, the upper press 33 connected thereto is connected to the lower press 34 fixed on the lower frame 9a. The lower and lower inflection elbows 31 are engaged with the recesses 31a of the upper inflection elbows 31 and the convex portions 32a of the lower inflection elbows 32 by the pressing force of the second cylinder 35. The steel sheet tip between 32 is bent downward along the inner circumferential surface of the recess 31a and the outer circumferential surface of the convex portion 32a.

When the inflection of the steel plate front end is completed, both the first cylinder 13 which is lowered for the steel plate clamping and the second cylinder 35 which is lowered for the steel plate front end bending work are lifted back, and at the same time, the main frame By raising the pad lowering cylinder 25 provided at the inlet side of (9) and turning the operating bar 23 back, the earth pad 21 which is in contact with the lower surface of the steel sheet during the steel sheet heating operation is idled instead of being separated from the steel sheet. The roll 22 is raised and returned to support the lower surface of the steel sheet. In this state, the steel sheet, the end of which is bent downward in the press section 30 after being heated in the heating section 10 proceeds in one direction to enter the cooling section 50 provided on the exit side of the main body frame 9 It proceeds to the steel plate progress line to be wound on the winder (4).

When the steel sheet is bent in the tip portion as described above enters the cooling unit 50, the guide cylinder 56 installed on the front side of the cooling unit 50 is raised to move the idle roll 57 mounted therein in one direction. In contact with the lower surface of the steel sheet to support it, and at the same time the control valve member 53 connected to the supply line 52 for supplying the cooling fluid is opened and operated in the steel plate width direction on the exit side of the main frame 9 A cooling fluid such as air or an inert gas is supplied into the pipe 51. Accordingly, the cooling fluid injected through the nozzles of the injection pipe 51 is injected onto the steel plate surface to cool the heated steel sheet tip. The injection of the cooling fluid causes the steel sheet tip to be cooled by the cooling unit 50. ) Is completely passed through, and when the steel plate front end passes completely, no further injection of cooling fluid is performed by the closing operation of the valve member 53.

When all the above heating, pressing and cooling processes are completed, the steel sheet is moved to the winding machine 4 side along the steel plate guide table as in the prior art, and is wound up by the coil in the winding machine 4, which is wound up. Since is downwardly bent it is possible to prevent the end mark is transferred to the surface of the steel sheet by the thickness step.

According to the present invention as described above, the leading end portion of the trailing steel sheet cut and placed on the exit side of the cutter is easily heated to bend, and the heated steel sheet leading portion is bent downward in accordance with the plate thickness, and the cooled steel sheet tip portion is cooled. By winding in the form of a roll in the winder, it is possible to remove the end mark due to the thickness difference of the end of the steel sheet which is generated during the winding in the winder, thereby preventing the failure of the coil product and thereby reworking the defective portion as before. In addition, the productivity of work can be improved, and the effect of increasing product satisfaction can be obtained from the demand price.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to clarify that knowledge is easy to know.

Claims (6)

In a winding apparatus for cutting a rolled steel sheet in the cutter (3) and wound in a roll form in the winder (4), A main body frame 9 installed on a pass line of the steel sheet; A first cylinder having upper and lower electrodes 11 and 12 that generate heat at the entrance of the main body frame 9 and moving the upper electrode 11 with respect to the fixed lower electrode 12 A heating unit (10) provided with a heating unit (10) for heating the front end of the steel plate held between the upper and lower electrodes (11, 12) to bend and bend easily; The upper and lower presses 33 and 34 are rotatably assembled with the upper and lower elbows 31 and 32 in the main body frame 9, and the upper press 33 is fixed to the lower press ( A press unit (30) having a second cylinder (35) to be moved relative to the 34) to press and bend the steel sheet tip disposed between the upper and lower bend elbows (31) (32); And a cooling unit 50 having a spray pipe 51 for injecting the cooling fluid supplied to the outlet side of the main body frame 9 on the steel plate surface in the width direction of the steel plate to cool the bent steel sheet tip. Steel sheet tip bending device characterized in that. The method of claim 1, The upper and lower electrodes 11 and 12 are replaceably assembled as a plurality of bolt members 14a and 15a on upper and lower surfaces of the upper and lower heat transfer plates 14 and 15 made of an insulator, and external power source. And a connector (16a) (16b) connected to the power cable to be supplied is connected to one end of each of the upper and lower electrodes (11) and (12). The method of claim 1, On the inlet side of the heating unit 10 is provided with an earth portion 20 to prevent the external power applied during the heating operation of the steel plate end portion to the other equipment side, the earth portion 20 and the lower surface of the steel sheet An earth pad 21 contacted in the width direction to energize external power to the ground, an idle roll 22 rotated to guide the one-way progression of the steel plate, and the earth pad 21 are mounted on one side thereof. An actuating bar 23 having a rectangular cross section on which the idle roll 22 is mounted on the other side, and a lower link 23b that is diffrably assembled through the upper link 23a and the pin member 23c of the actuating bar. Of the fixed link 25a, 25b having the rod lowering cylinder 27 configured to be connected to the rod end, and rod ends of the cylinder 27 penetrating and fixed at one end to both left and right ends of the operation bar 23. The bar turning cylinder 25 connected to the other end and the rod end is fixedly installed at both ends. Steel sheet tip bending device, characterized in that consisting of a fixed base (26). The method of claim 1, The upper press 33 has a shaft hole (33a) is rotatably accommodated in the upper inflexion elbow 31 formed of a plurality of inclusions in the circumferential direction of the concave portion (31a) of the arc-shaped cross section having a different curvature radius, the recess (31a) The opening 33b cut in the longitudinal direction is formed at one corner so that the outer exposure is formed, and the lower press 34 has lower curved elbows in which a plurality of convex portions 32a of arc-shaped sections having different curvature radii protrude in the circumferential direction. The shaft hole 34a in which the 32 is rotatably received, and the opening portion 34b cut in the longitudinal direction so that the convex portion 32a is exposed to the outside in correspondence with the recess 31a, are formed at one corner thereof. Each of the rotary shafts 31b and 32b of the upper and lower curved elbows 31 and 32 has a concave portion 31a and a convex portion 32a having the same radius of curvature so as to correspond to each other through the openings 33b and 34b. Upper and lower motors 35 and 36 mounted on the upper and lower presses 33 and 34. Steel plate front end bending device characterized in that the rotatably connected by the driving force of the. The method of claim 1,  The upper and lower motors 35 and 36 installed at one end of the upper and lower presses 33 and 34 are driven to drive the respective driving shafts so as to transmit rotational power to the upper and lower inflection elbows 31 and 32. The sprockets 37a and 38a are driven sprockets 37c mounted on one end of each of the rotary shafts 31b and 32b of the upper and lower inflection elbows 31 and 32 via the chain members 37b and 38b. The steel plate tip inflection device is configured to be connected to (38c), and provided with PIL (35a) (36a) so as to detect the rotation amount of the upper and lower motors (35, 36), respectively. The method of claim 1, The upper and lower curved elbows 31 and 32 have the upper ends of the rotary shafts 31b and 32b to detect positions of the plurality of recesses 31a and the convex portions 32a having different radii of curvature. The plurality of upper and lower detection bars 41 and 42 sensed by the first and second sensor members 43 and 44 mounted on the lower elbows 31 and 32 are provided with the plurality of concave and convex portions 31a. The third and third mounting parts mounted on the upper and lower presses 33 and 34 so as to be mounted at the position corresponding to the upper and lower bending elbows 31 and 32, respectively. 4, characterized in that it comprises a stopper 47 which is operated by the detection signal of the sensor member (45) (46).

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