KR100270101B1 - Device and method of removing end-mark of cold rolled steel plate - Google Patents

Abstract

PURPOSE: An apparatus and a method for removing end mark defects of a cold rolled steel sheet is provided to prevent end marks of a cold rolled product after coiling from being formed by inclined processing the front part of the cold rolled steel sheet at the front of a coiling machine of a continuous cold rolling line. CONSTITUTION: The apparatus comprises a body part (10) equipped with a rectangular structured frame (12), a servo motor (20) and a gear connecting device; a steel sheet detecting part (26) equipped with a floodlight (28a) and a light receiver (28b); a steel sheet cutting part (40) equipped with an ascending frame (30) and a cutter frame (44); a steel sheet front detecting part (70) which is equipped with a transfer plate (73) for detecting the front position of the steel sheet (S); a clamp part (58) equipped with a pressing plate for closely adhering the steel sheet between the cutter frame and the rectangular frame (12); an air ejecting part equipped with an air supplying pipe and a plurality of air ejecting nozzles for removing cutting chips from the steel sheet (S); a steel sheet passing table (14b) equipped with a plurality of rollers (14c) and a cylinder (14d) descending the rollers so as to passing the steel sheet (S); a lock part (80) equipped with a cylinder for fixing vertical movement of an ascending frame (30) on the rectangular frame (12); and a control part electrically connected to the steel sheet detecting part (26) and the steel sheet front detecting part (70) so as to cutting the front of the steel sheet to a certain angle of inclination by automatically controlling a plurality of motors, hydraulic cylinders, etc.

Description

End mark defect removal device and method of cold rolled steel sheet

The present invention relates to an apparatus and method for removing end-mark defects due to the thickness of the first coil steel sheet which occurs on the coil steel sheet wound after the second due to the thickness of the steel sheet when the cold rolled steel sheet is finally coiled. In more detail, when the coil is continuously wound on the coil winding machine by installing the coil in front of the coil winding machine and inclining the cold rolled steel sheet tip in the thickness direction to make the thickness thinner, the end mark defect due to the thickness of the first coil steel sheet (bending marks The present invention relates to an apparatus and a method capable of eliminating a defect).

In general, the end mark (K) of the cold rolled steel sheet (S) is the first steel coil coiled by the tension applied to the cold rolled steel sheet (S) when winding the cold rolled steel sheet (S) in the winder 220 as shown in FIG. Because of the thickness of the second winding, the coil is continuously pressed down by one place on one winding coil. The end mark (K) is a cold rolled steel sheet of 0.8mm-2.3mm thickness of the steel sheet (S), 610mm-1,850mm width of the steel sheet is applied, and in order to reduce the end mark (K) in the related art winding machine 220 Although a method is used to process a groove in a rubber sleeve (not shown) used to allow the tip of the first coil steel sheet (S) to enter the groove, the sleeve stop position of the winder 220 is the first entry steel sheet (S). ), There is a problem that can not be carried out.

The present invention is to solve the conventional problems as described above, in the continuous cold rolling process can automatically detect the tip of the cold-rolled steel sheet, the inclined cutting process and the plate can be continuously, inclined processing angle and processing by the thickness of the steel sheet It is an object of the present invention to provide an end mark defect removal device and a method for removing cold-rolled steel sheet by adjusting the width or selectively passing through it to remove the end mark from the cold-rolled product.

1 is a block diagram of a cold rolling facility equipped with the end mark defect removing device of the present invention.

2 is a front view showing an end mark defect removing device of a cold rolled steel sheet according to the present invention.

Figure 3 is a side cross-sectional view showing a device for removing an end mark defect of a cold rolled steel sheet according to the present invention.

4 is a cross-sectional view showing the steel sheet cutting operation of the end mark defect removal device of the cold rolled steel sheet according to the present invention.

5 is a cross-sectional view showing a steel plate front end detection unit of the end mark defect removal device of the cold rolled steel sheet according to the present invention.

Figure 6 is a longitudinal cross-sectional view showing the steel plate front end detection portion of the end mark defect removal device of the cold rolled steel sheet according to the present invention.

7 is an explanatory diagram showing a situation of removing the end mark defect of the cold rolled steel sheet according to the present invention.

8 is an explanatory diagram showing a situation in which defects in end marks occur when the cold rolled steel sheet is wound in accordance with the conventional art.

9 is a flowchart illustrating a step-by-step method for removing defects in the end marks of the cold rolled steel sheet according to the present invention.

* Explanation of symbols for main parts of the drawings

10: main body 12: square frame

16: base 20: servo motor

24a: pinion gear 24b: rack gear

30: lifting frame 36: hydraulic cylinder

40: cut steel sheet 46: motor

48: milling cutter 50: dust cover

52: open and close cylinder 58: clamp portion

66b: Air injection nozzle 70: Steel plate tip detection part

73: rotating plate 75: rotary actuator

78: encoder 80: safety lock

90 control unit 210 cutter

220: winder K: end mark

S: steel plate

In order to achieve the above object, the present invention, in the device for removing the end mark generated during the winding of the cold-rolled steel sheet, provided with a frame of a rectangular structure disposed in the width direction of the steel plate progress line, the base The main body having a servo motor and a gear connecting mechanism for moving back and forth in the traveling direction of the steel plate on the guide of the steel plate, mounted on the front end of the square frame, and having a light emitter and a light receiver arranged above and below the steel plate, Steel plate detection unit for detecting the flow into the inside, guided vertically on the guide which is located inside the rectangular frame and arranged vertically inside the rectangular frame, by the hydraulic unit and the hydraulic cylinder disposed on the upper side of the rectangular frame Lifting frame, which moves up and down, moving in the width direction of the steel plate with respect to the lifting frame It is equipped with a cutter frame capable of adjusting the inclination angle, the cutter frame is provided with a plurality of motors, and the motor is provided with a plurality of milling cutters in the width direction of the steel plate, while one side of the lifting frame is a cutter frame. Steel plate cutting part having a hydraulic cylinder for displacing the steel plate in the width direction of the steel plate, the steel plate being movable in the longitudinal direction of the steel plate at the lower side of the square frame, and moving to the elastic side by mounting a spring between the frame on both sides. A plate is provided, and a rotary actuator is mounted at the center of the moving plate, and a rotating plate is provided at the rotational axis thereof on the upper side of the transfer line of the steel plate, while a piano wire extends at the rear side of the moving plate to be connected to the encoder, thereby leading to the end of the steel plate. Steel plate tip detection unit for detecting position, mounted on the cutter frame to move up and down It is equipped with a pressing plate that can be made of steel, and the clamp part for closely contacting the steel plate with the square frame when the cutter frame is lowered, the air supply pipe attached to the cutter frame, and a plurality of air spray nozzles connected thereto are cut by the milling cutter. At the time, the air injection unit for removing the cutting chip from the steel sheet, a plurality of rollers to move up and down in the lower portion of the steel sheet and a cylinder for raising and lowering the plate through the plate through the plate, mounted on one side of the square frame A lock portion having a cylinder, the rod of the cylinder entering and exiting a hole formed on the side of the lifting frame to fix a shanghai movement of the lifting frame relative to the square frame, and electrically connected to the steel plate detecting portion and the steel plate tip detecting portion, Automatically control the motor and hydraulic cylinder to cut the tip of the steel plate at a constant angle of inclination. By providing an end mark defect removal device of the cold rolled steel sheet, characterized in that it comprises a control unit for cutting.

In addition, the present invention in the method of processing the inclined end portion of the cold rolled steel sheet in front of the winding machine of the cold rolling continuous line in order to remove the end mark generated during the winding of the cold rolled steel sheet, the step of inclining the end portion of the cold rolled steel sheet Detecting the end of the steel sheet, the dust cover is rotated downward to prevent the cutting chips from scattering, the cutter rotating motor starts to rotate, the milling cutter rotates, the air spray nozzle is a compressed air cutter An end mark is generated, comprising: starting to be called to the side, milling cutter is lowered to start cutting the steel sheet, and after the cutting is completed, the milling cutter is raised from the cutting position and returned to the origin. By providing a method for removing the end mark defect of the cold rolled steel sheet.

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

The end mark defect removing device 1 of the cold rolled steel sheet according to the present invention is located on the wake side of the pinch roll 205 and the cutter 210 in the steel sheet S traveling line, as shown in FIG. And a main body portion 10 positioned upstream of the deflector roll 212 and the winder 220 in the width direction of the steel sheet S, the main body portion 10 being shown in FIG. As described above, a frame 12 having a rectangular structure is provided, and the frame 12 is provided with a front plate table 14a positioned at a lower portion of the traveling line of the steel sheet S, and the square frame 12 has a lower surface. It is mounted on the guide 18 of the base 16 located in the advancing direction of the steel sheet S so as to be moved forward and backward, and a servo motor 20 for moving the square frame 12 is disposed on one side. . In addition, the gear connecting mechanism 22 is connected to the rotary shaft 20a of the servo motor 20 to accurately move the square frame 12 to a stop position of the steel sheet S with a tolerance of ± 1 mm as described later. The gear connecting mechanism 22 has pinion gears 24a formed on both sides of the square frame 12, and the pinion gear 24a has rack sizes formed on both sides of the lower surface of the square frame 12, respectively. The fish 24b is configured to engage. Accordingly, the rectangular frame 12 may be driven forward and backward in the longitudinal direction of the steel plate S through the plurality of pinion gears 24a and the rack gears 24b by driving the servo motor 20.

In addition, a steel plate detector 26 is mounted at the front end of the rectangular frame 12, and the steel plate detector 26 is disposed above and below the steel sheet S as illustrated in FIG. 3. And a light receiver 28b to form a photo head sensor, and detect that steel sheet S flows into the body portion 10 so as to periodically transmit a signal to the controller 90 to be described later. To transmit.

In addition, the elevating frame 30 is located inside the rectangular frame 12, which is vertically guided on the guide 32 vertically disposed inside the rectangular frame 12, and the upper portion of the rectangular frame 12. The hydraulic unit 34 and the hydraulic cylinder 36 arranged on the side are configured to move up and down. That is, the lifting frame 30 is connected to the rod (36a) of the plurality of hydraulic cylinders 36 arranged vertically on the upper side of the rectangular frame 12 is raised and lowered by the operation of the hydraulic cylinder (36) It is done.

Then, the lower portion of the elevating frame 30, the steel plate cutting portion 40 which moves up and down with the elevating frame 30 is located, which is in the width direction of the steel plate (S) relative to the elevating frame (30) The fixing plate 42 is slidably connected to the plurality of guides 41 mounted on the lower surface of the elevating frame 30 so as to move freely, and the fixing plate 42 has a cutter frame 44 in which the inclination angle is freely adjusted. ) Is connected. In addition, the cutter frame 44 is equipped with a plurality of motors 46 extending side by side in the width direction of the steel plate (S), the motor 46 has a plurality of milling cutters 48 of the steel plate (S) The dust cover 50 is disposed at a predetermined interval in the width direction, and the dust cover 50 is disposed on the upper side of each milling cutter 48 so that the machining chip is not scattered when the steel sheet S is cut by the milling cutter 48. It is formed over the full width of the frame 44. In addition, the dust cover 50 is raised and lowered by the operation of the opening and closing cylinder 52 arranged on the rear side of the cutter frame 44, the opening and closing cylinder 52 to the upper side of the dust cover 50. Link member 54 extending from the rod 52a of the () is connected so that the dust cover 50 is closed by rotating the lowering frame 32 in the lowered state when the cutting process is lowered, so that the cutting chips are not dispersed To fall to the bottom.

In the above, the fixing plate 42 and the cutter frame 44 are connected to be able to adjust the inclination angle as shown in FIG. 4, which is the upper front side of the cutter frame 44 through the hinge 45a. The push bolt 45b which is connected to the lower front side of the lower side of the 42 so as to be rotatable and protrudes downward from the fixing plate 42 to adjust the length thereof and pressurizes the upper surface of the cutter frame 44. Adjacent to the lower side from the fixing plate 42 to extend to the through-hole 45c of the cutter frame 44, the fixing plate 42 is provided with a support bolt 45e fixed with a nut 45d and held horizontally The mounting angle of the cutter frame 44 can be changed with respect to the cutting angle formed by the milling cutter 48 of the motor 46 mounted on the cutter frame 44 with respect to the steel sheet S. To make it change.

In addition, the cutter frame 44, the clamp portion 58 is formed in the front side bar, the clamp portion 58 is Equipped with a pressing plate (59b) is connected through a fixed stand (59a) connected in the form is configured to be lowered at the same time when the cutter frame 44 is lowered in close contact with the steel plate (S) between the square frame (12).

On the other hand, one side of the lifting frame 30, as shown in Figure 2, is equipped with a cutter feed cylinder 62 for displacing the cutter frame 44 in the width direction of the steel sheet (S), When the body of the cutter feed cylinder 62 is fixed to the square frame 12, the rod is connected to the cutter frame 44, the cutting of the steel sheet (S) is made, the cutter frame (62) by the cutter feed cylinder (62) 44) and the milling cutter 48 is 200mm in the width direction of the steel sheet (S) is configured so that each of the ten milling cutters 48 travel cutting by 200mm in the width direction of the steel sheet (S).

In addition, the air injection unit 65 mounted on the cutter frame 44 is configured to remove the cutting chip from the steel sheet (S) during the cutting operation by the milling cutter 48, which is the cutter frame 44 And an air supply plate 66a mounted to the air supply plate 66, and a plurality of air injection nozzles 66b connected thereto, and the tip of the air injection nozzles 66b extends to the ends of the milling cutter 48 and the cutter cover 48a. Will be.

Then, the steel sheet tip detection unit 70 for detecting the line unit value of the steel sheet (S) at the lower side of the rectangular frame 12 is mounted to the rectangular frame 12, as shown in FIG. A pair of guide rods 72 fitted in the circular guide sphere 71 and a movable plate 73 movable in the longitudinal direction of the steel plate S, and springs 74 on both sides of the movable plate 73. Is mounted between the frame 12 and has a structure that is elastically supported. In addition, a rotary actuator 75 is mounted at the center of the movable plate 73, and a rotary plate 75 is provided on the rotary shaft of the movable plate 73 to protrude upward from the upper side of the transfer line of the steel plate S. On the rear side, the piano wire 77 extends and is connected to the encoder 78.

Therefore, when the steel plate tip detection unit 70 as described above is contacted with the rotary plate 76 by the steel plate S advancing toward the upper side of the square frame 12, the rotary plate 76 is moved by the force of the steel plate S. The spring 74 of the moving plate 73 is advanced while being moved together with the steel sheet S, and at the same time, the piano wire 77 is pulled to operate the encoder 78. Accordingly, the encoder 78 transmits an electrical signal corresponding to the lead length of the piano wire 77 to the controller 90 to be described later, so that the control unit 90 receives the tip Sa of the steel sheet S. When the rotary plate 76 is recognized and the distance is advanced, and the rotary actuator 75 is operated to rotate the rotary plate 76 downward, the rotary plate 76 and the moving plate 73 are driven by the restoring force of the spring 74. Will be returned to its original position. The controller 90 drives the servomotor 20 to move the square frame 12 of the main body 10 to the front end side of the steel sheet S by the distance input from the encoder 78.

Meanwhile, as shown in FIG. 3, the rear plate table 14b that is lowered up and down from the lower portion of the steel sheet S is in contact with the lower surface of the steel sheet S and is capable of idling a plurality of rollers 14c. And it is provided with a cylinder (14d) to raise and lower it, the plate steel plate (S) is to be, which is the cylinder (14d) is arranged upright in the rear side lower portion of the square frame (12).

In addition, the safety lock portion 80 to prevent the lifting frame 30 is not moved to the lower side during the non-cutting operation of the steel sheet (S) by the milling cutter 48 is a cylinder mounted to one side of the square frame (12) ( 82, a rod (not shown) of the cylinder 82 enters and exits a hole (not shown) formed on the side of the lifting frame 30 to move up and down the lifting frame 30 with respect to the square frame 12. It is configured to fix the movement.

In addition, the control unit 90 is electrically connected to the steel plate detecting unit 26 and the steel plate front end detecting unit 70 to receive an electrical signal, and automatically operates the plurality of motors and the plurality of hydraulic cylinders through a series of planned programs. By controlling and cutting the front end Sa of the steel sheet S with a plurality of milling cutters 48 at a constant inclination angle, the steel sheet S whose tip is inclined through this cutting processing is wound by the winding machine 220. When wound with a coil, it is such that no end mark K is formed as shown in FIG.

In addition, the control unit 90 separates the cold rolled steel sheet (S) for cutting the end mark (K) and the non-cutting cold rolled steel (S) on the program in the case of the non-cutting cold rolled steel sheet (S), the lifting frame ( 30) is raised and the plate tables 14a, 14b are raised so that the cold rolled steel sheet S can be plated without cutting, and in the case of the cold rolled steel sheet S for cutting work, the lifting frame 30 is lowered and the plate table 14a and 14b are lowered so that the milling cutter 48 can perform a cutting operation.

Referring to the end mark defect removal method of the cold rolled steel sheet by the apparatus 1 of the present invention configured as described above are as follows. That is, according to the end mark defect removal method of the present invention, in order to remove the end mark (K) generated during the winding of the cold rolled steel sheet (S), the front end portion of the cold rolled steel sheet (S) in front of the winding machine 220 of the cold continuous line It includes the step (100) of processing (Sa) inclined.

As shown in FIG. 9, the cold rolled steel sheet S detects the presence or absence of the cold rolled steel sheet S, and the electric transmitter 28a and the light receiver 28b of the steel sheet detector 26 detect an electrical signal indicating that the cold rolled steel sheet S is present. A step 110 is transmitted to the control unit 90, and the control unit 90 receives a signal indicating that the steel plate S has been cut by the cutter 210, which is a peripheral facility, and a signal indicating the steel plate S for processing the end mark K. When received at the same time, the device 1 enters the cutting mode step 112, which is the next step.

The cutting mode step 112 starts automatically, and the rising step 116 of the steel plate front end detection unit 70 and the lifting step 114 of the lifting frame 30 are simultaneously made. When the lifting frame 30 reaches the upper limit, step 118 is performed in which the safety lock unit 80 is released.

Then, when the steel sheet tip detection unit 70 moves forward by the steel plate S tip Sa and stops, the encoder 78 outputs a deviation value between the origin and the stop position to produce the steel sheet S. Detecting the tip Sa (120) is made, the control unit 90 receives this output signal to operate the servo drive motor 20 to move the square frame 12 by the amount of deviation in front of the steel sheet (S) Step 122 is made to move to the side.

In addition, when the positioning of the frame 12 of the main body portion 10 is completed as described above, the dust cover 50 is closed by rotating and closing in a downward direction so that the cutting chip is not scattered 124. The steel plate front end detection unit 70 rotates from the front end of the steel plate to one side by the operation of the rotary actuator 75 so that the steel plate front end detection unit 70 passes over the steel plate S and does not interfere with the progressing steel plate S. Step 126 is made.

When all the conditions of the steps 118, 124, and 126 are satisfied, the cutter rotating motor 46 starts to rotate and the milling cutter 48 rotates 130, and the lifting frame ( Step 30 is performed by the hydraulic cylinder 36 to descend from the inside of the rectangular frame 12, and the air injection nozzle 66b starts to blow the compressed air to the cutter 48 (134). ) Is done.

Then, the lifting frame 30, the cutter frame 44 and the ten milling cutters 48 connected thereto are lowered to start the cutting of the steel sheet S (136), and the cutting of the steel sheet S is performed. When the cutter frame 44 and the milling cutter 48 advance 200 mm in the width direction of the steel plate S by the cutter transfer cylinder 62, each of the ten milling cutters 48 moves the steel plate S in the width direction. Travel cutting.

On the other hand, when the lifting frame 30 is lowered in the above, the plate table 14a, 14b is lowered simultaneously with the lifting frame 30, the rear plate table 14b is accompanied by the operation of the cylinder 14d. do.

After the traveling cutting is completed as described above, the lifting frame 30 is lifted up (step 138), and the air spraying operation for removing the cutting chip from the cutting surface of the steel sheet (S) is lifting the lifting frame (30). Continue until complete.

Then, after the lifting of the lifting frame 30 is completed, the milling cutter 48 is raised at the cutting position to return to the origin 140, and the square frame 12 of the main body 10 is at the cutting position. Step 142 is made to return to the origin, the safety lock unit 80 is operated to lock the lifting frame 30 with respect to the square frame 12 is made 144, the dust cover 50 is The step 146 of rotating and opening by the opening and closing cylinder 52 is made at the same time.

When the operation is completed, the completion step 150 of one cycle is processed.

As described above, the end mark defect removing device and method of the present invention completely solves the problem of cutting off the defective part by generating an end mark defect of 2 ton per coil (8-15) generated during winding of the cold rolled steel sheet. It is possible to produce cold rolled coil without end mark (K) defect, and to adjust inclined processing angle and processing width according to the thickness of steel sheet (S), or to selectively produce cold rolled products of good quality through non-processing. Of course, the effect of greatly improving the error rate is obtained.

Claims (10)

In the apparatus for removing the end mark (K) generated during the winding of the cold rolled steel sheet (S), provided with a frame 12 having a rectangular structure arranged in the width direction of the steel sheet (S) progress line, the frame (12) ) Main body 10 having a servo motor 20 and a gear connecting mechanism 22 for moving the back and forth on the guide 18 of the base 16 in the advancing direction of the steel sheet S, the rectangular frame. A steel plate detection unit mounted at the front end of the (12) and equipped with a light-transmitter 28a and a light-receiver 28b disposed above and below the steel plate S to detect that the steel plate S flows into the body portion 10. (26), the hydraulic unit is located on the inner side of the rectangular frame 12 and vertically guided on the guide 32 disposed vertically inside the rectangular frame 12, the hydraulic unit disposed on the upper side of the rectangular frame 12 With respect to the elevating frame 30, the elevating frame 30, which is moved up and down by the 34 and the hydraulic cylinder 36, The cutter frame 44 is movable in the width direction of the plate S, and the angle of inclination can be adjusted. The cutter frame 44 is provided with a plurality of motors 46, and the motor 46 has a plurality of motors. While the milling cutter 48 is disposed in the width direction of the steel plate S, the cutter transfer cylinder 62 for displacing the cutter frame 44 in the width direction of the steel plate S on one side of the lifting frame 30. ) And a steel plate cutting part 40, which is movable in the longitudinal direction of the steel plate (S) from the lower side of the square frame 12, on both sides mounting a spring 74 between the frame 12 and And a moving plate 73 which is elastically supported, and a rotary actuator 75 is mounted at the center of the moving plate 73, and a rotary plate 76 which is rotatable to an upper side of the transfer line of the steel plate S at the rotating shaft thereof. On the other hand, the piano wire 77 is extended to the rear side of the movable plate 73 and connected to the encoder 78. Thus, the steel sheet tip detection unit 70 for detecting the line unit value of the steel sheet S and the pressing plate 59b mounted on the cutter frame 12 and capable of raising and lowering up and down are provided. ) Is provided with a clamp unit 58 for close contact between the square frame 12, an air supply pipe 66a mounted on the cutter frame 44, and a plurality of air spray nozzles 66b connected thereto. In the cutting operation by the 48, the air injection unit 65 for removing the cutting chip from the steel sheet (S), a plurality of rollers (14c) to move up and down in the lower portion of the steel sheet (S) and lifting it up and down And a cylinder 82 mounted on one side of the square frame 12 to provide a plate 14b for allowing the steel plate S to flow through the cylinder 14d, and the rod of the cylinder 82 lifts and lowers the frame 30. Up and down of the lifting frame 30 with respect to the square frame 12 by entering and exiting the hole formed in the side of It is electrically connected to the lock portion 80 to fix the movement, and the steel plate detection unit 26 and the steel plate front end detection unit 70, the automatic control of the plurality of motors and a plurality of hydraulic cylinders of the steel sheet (S) The end mark defect removal apparatus of the cold rolled steel sheet characterized by including the control part 90 which cuts the front end Sa by a fixed inclination-angle. The lifting frame according to claim 1, wherein the control unit 90 divides the end mark (K) from the cold rolled steel sheet (S) for cutting and the cold rolled steel sheet (S) for non-cutting. Raise the 30 and raise the plate tables 14a and 14b so that the cold rolled steel sheet S is plated, and in the case of the cold rolled steel sheet S for cutting, the lifting frame 30 is lowered and the plate table 14a is raised. ), (14b) is lowered, the end mark defect removal device of the cold rolled steel, characterized in that the milling cutter (48) is configured to perform the cutting operation. The cutter transfer cylinder of claim 1, wherein the body of the cutter transfer cylinder 62 is fixed to the square frame 12, and the rod is connected to the cutter frame 44 so that the cutting of the steel sheet S is performed. The cutter frame 44 and the milling cutter 48 proceed 200 mm in the width direction of the steel sheet S so that each of the ten milling cutters 48 is configured to travel cutting the steel sheet S in the width direction by 200 mm. Endmark defect removal device of the cold rolled steel. According to claim 1, The cutter frame 44 is connected to the upper front side so as to be rotatable to the lower front side of the fixed plate 42 mounted to the lifting frame 30 through the hinge 45a, the fixed plate to the rear side Protruding downward from the 42 and the length adjustment is possible and the pressing bolt 45b for pressing the upper surface of the cutter frame 44, and adjacent to this extending from the fixing plate 42 to the lower side of the cutter frame 44 The mounting angle of the cutter frame 44 is changed with respect to the fixed plate 42 extending horizontally through the through hole 45c and held horizontally with a support bolt 45e fixed with a nut 45d. Milling cutter (48) of the motor (46) mounted on the) end mark defect removal apparatus of the cold rolled steel sheet, characterized in that configured to change the cutting angle formed with respect to the steel sheet (S). According to claim 1, wherein the steel plate front end detection unit 70 is the upper surface of the rectangular frame 12, when the steel sheet (S) proceeds to contact the rotating plate 76, the rotating plate 76 is to advance the steel plate (S) The spring 74 of the moving plate 73 is moved by the force and is advanced together with the steel sheet S. At the same time, the piano wire 77 is pulled to operate the encoder 78, and in the encoder 78, the piano The electrical signal corresponding to the lead length of the line 77 is transmitted to the controller 90, and the controller 90 is a steel plate 10 of the body portion 10 by the distance input from the encoder 78 An apparatus for removing an end mark defect of a cold rolled steel sheet, characterized in that the servo motor 20 is driven to move toward the tip side of (S). The rotating plate 76 is rotated by the rotary actuator 75, the rotating plate 76 and the moving plate 73 is returned to its original position due to the restoring force of the spring (74). End mark defect removal device of cold rolled steel sheet. In the method of inclining the tip portion Sa of the cold rolled steel sheet (S) in front of the winding machine 220 of the cold continuous line in order to remove the end mark (K) generated during the winding of the cold rolled steel sheet (S), Step 100 of obliquely processing the front end portion Sa of the cold rolled steel sheet (S), step 120 of detecting the front end portion Sa of the steel sheet (S), the dust cover 50 is rotated in the downward direction to cut Step 124 to prevent the chip from flying, step 130 in which the cutter rotating motor 46 starts to rotate, and the milling cutter 48 rotates 130, the air spray nozzle 66b moves the compressed air to the cutter 48 side. Cold rolling to prevent the end mark K from occurring, characterized in that it comprises a step 134 of starting blowing, 134, after the completion of the cutting, the milling cutter 48 is raised from the cutting position and returned to the origin. How to remove end mark defects in steel sheet. The method of claim 7, wherein the step 100 is a step (110) of detecting the presence or absence of cold rolled steel (S), the cutting mode step 112, the lifting step 116 of the steel sheet tip detection unit 70, the lifting frame ( 30, the rising step 114, when the lifting frame 30 reaches the upper limit (step 118), the safety lock unit 80 is released, the deviation between the origin and the stop position by the encoder 78 In step 120 of detecting the tip Sa of the steel sheet S by outputting a value, the controller 90 receives the output signal to operate the servo drive motor 20 to move the square frame 12 by the amount of deviation. Step 122 to move to the front side of the steel sheet (S), the dust cover 50 is rotated in a downward direction to prevent the cutting chip is scattered (124), the front end detection portion 70 of the steel sheet (S) When all the conditions of the steps 126, 118, 124, and 126 are prevented from interfering with the plate, the cutter rotating motor 46 starts to rotate and the milling cutter ( 48 is rotated 130, the lifting frame 30 is lowered to the inside of the rectangular frame 12 by the hydraulic cylinder 36 (132), the air spray nozzle (66b) is a compressed air cutter ( 48, the step of starting to blow to the side 134, the milling cutter 48 is lowered to start the cutting of the steel sheet (S) (136), after the traveling cutting is completed, the lifting frame 30 is raised ( 138), after the lifting of the lifting frame 30 is completed, the milling cutter 48 is raised at the cutting position to return to the origin 140, the square frame 12 of the body portion 10 is the origin at the cutting position Returning to step 142, the safety lock unit 80 is operated to lock the lifting frame 30 with respect to the square frame 12 (144), the dust cover 50 by the opening and closing cylinder 52 And an open step (146), and a step (150) in which one cycle is completed when all the operations are completed. How to remove the defect mark the end of the cold-rolled steel sheet so that equal does not occur. The end of the cold rolled steel sheet as claimed in claim 8, wherein the rising step 116 of the steel plate front end detection part 70 and the lifting step 114 of the lifting frame 30 are simultaneously performed. How to remove mark defects. The method of claim 8, wherein the milling cutter 48 is raised at the cutting position to return to the origin 140, and the square frame 12 of the body portion 10 is returned to the origin from the cutting position (142) And, the safety lock unit 80 is operated to lock the lifting frame 30 with respect to the square frame 12 (144), and the dust cover 50 is opened by the opening and closing cylinder 52 (146) ) Is an end mark defect removal method of the cold rolled steel sheet to prevent the end mark is generated, characterized in that at the same time.