JP2005153063A - Method and device for cutting sheet material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and surely perform the positioning in the width direction of a sheet material with a positioning device by preventing the return of the sheet material even if a clamp on the feeder side is opened. <P>SOLUTION: The cutting method has the following constitution. The sheet material 3, which is rewound from a coil 1, is fed to a cutting die 7 by a feeder 5. The tip of the sheet material 3 is brought into contact with a stopper 8. The sheet material 3 is cut by a cutting blade 11 while being constrained by the clamp and a feeding means 6 in the feeder 5 and the clamp 10 in the cutting die 7. A planar clamp 23 and a pressing means 26, which regulate the movement to the return direction of the sheet material 3 but allow the movement to the direction of crossing with its feeding direction A, are arranged between the feeder 5 and the cutting die 7. The sheet material 3 is pressed to the reference block 13 side by the pressing means 26 while being clamped by the planar clamp 23 before constraining the sheet material 3 by the clamps 6, 10 in the feeder 5 and the cutting die 7. The inclination of the sheet material 3 is corrected. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method and an apparatus for cutting a sheet material into a predetermined length.

  Conventionally, as shown in FIG. 8, this type of sheet material cutting method is such that a sheet material 3 unwound from an uncoiler 2 that supports a coil 1 is fed to a feeder 5 through a guide roller 4, and this sheet material 3 is The clamp in the feeder 5 and the feeding means 6 are rotated to feed the cutting die 7, and the tip of the sheet material 3 is brought into contact with the stopper 8 in the cutting die 7. In this state, the clamp and feeding means 6 in the feeder 5 The sheet material 3 is cut into a predetermined length by the cutting blades 11 (the lower cutting blade 11a and the upper cutting blade 11b) in the cutting die 7 while restraining the sheet material 3 with the clamp (flat plate) 10 in the cutting die 7. It was like that.

  By the way, when the sheet material cut as described above is used, for example, as a material for a thin-walled welded tube, a thin-walled (0.5 mm or less) sheet material (cut sheet) is first cut into a cylinder in the welding process. After that, the butt portion of the cut sheet is joined by plasma welding, laser welding, or the like. In this case, not only the length of the cut sheet, but also its parallelism and squareness directly affect the dimensional shape accuracy of the welded pipe, and therefore the sheet material must be positioned with high accuracy when cutting the sheet material.

  Therefore, in the conventional cutting method of the sheet material 3, after the leading end of the sheet material 3 sent into the cutting die 7 comes into contact with the stopper 8, first, the sheet material 3 is first clamped by the clamp 10 in the cutting die 7. Then, the clamp and the feeding means 6 in the feeder 5 are unclamped and clamped to eliminate the deflection of the sheet material 3, thereby ensuring a desired cutting length. The cutting die 7 includes a pressing means (roller) 12 that presses one side surface of the sheet material 3 in the width direction and a reference block 13 that receives the other side surface of the sheet material 3 pressed by the pressing means 12. A positioning device 14 is provided, and after the leading end of the sheet material 3 sent into the cutting die 7 comes into contact with the stopper 8, the positioning device 14 is operated to position the sheet material 3 in the width direction. The degree of parallelism and perpendicularity was ensured.

  In the sheet material cutting device attached to the press processing device, the front end of the sheet material is brought into contact with the stopper, the workpiece (sheet material) is gripped by a clamp mounted on the carriage, and then the sheet is moved by moving the carriage. Although the material is drawn and cut by a predetermined length (see Patent Document 1), in this case, since the deflection is eliminated by drawing the sheet material, it is not necessary to once open the clamp in the feeder. .

JP-A-4-41030

However, the sheet material 3 unwound from the coil 1 usually allows a certain amount of side deflection (0.5 mm / 1 m), and as a result, the sheet material 3 as shown by the dotted line in FIG. 3 is inclined with respect to the feed direction A. Due to the accumulation of the deflection of the sheet material 3, the lateral displacement of the sheet material 3 is maximized in the cutting die 7. At this stage, the sheet material 3 is clamped by the clamp in the feeder 5 and the feeding means 6. Therefore, even if the pressing means 12 described above is operated, there is a problem that the sheet material 3 does not move laterally to the reference block 13 side and positioning of the sheet material 3 in the width direction becomes substantially impossible. . In order to solve this problem, the positioning device 14 may be operated with the clamp and the feeding means 6 in the feeder 5 opened. In this case, the sheet material 3 moves in the return direction and the The tip is separated from the stopper 8 and a desired cutting length cannot be ensured.
In addition, according to the cutting device described in Patent Document 1, the clamp does not have a function of positioning the sheet material in the width direction, and thus a desired parallelism and squareness cannot be obtained.

  The present invention has been made in view of the above-described conventional problems, and the object of the present invention is to prevent the sheet material from returning even if the feeder-side clamp is opened, and thus the sheet by the positioning device. An object of the present invention is to provide a sheet material cutting method and a cutting apparatus capable of easily and reliably positioning a material in the width direction.

  In order to solve the above-described problems, the sheet material cutting method according to the present invention is configured such that the leading end of the sheet material sent from the feeder to the cutting die is brought into contact with the stopper, and the sheet in the feeder and the clamp in the cutting die In the cutting method in which the sheet material is cut into a predetermined length by the cutting blade in the cutting die while restraining the material, the movement of the sheet material in the return direction is restricted between the feeder and the cutting die. Further, a plane clamp that allows movement in a direction crossing the feeding direction is provided, and the sheet material is restrained by the plane clamp prior to the restraint of the sheet material by the clamp in the feeder and the clamp in the cutting die. The sheet material is positioned in the width direction while holding the sheet. In this case, a pair of upper and lower rotating rollers that rotate about an axis extending in the sheet material feeding direction can be used as the flat clamp disposed between the feeder and the cutting die.

  In the sheet material cutting method performed in this way, since the flat clamp between the feeder and the cutting die clamps the sheet material, even if the clamp in the feeder and the clamp in the cutting die are released, the sheet The material never returns. In addition, this flat clamp allows the sheet material to move in a direction that intersects the feed direction, so that the sheet material moves laterally according to the operation of the positioning device, and the sheet material can be positioned in the width direction. Become. In this cutting method, when a pair of upper and lower rotating rollers that rotate about an axis extending in the sheet material feeding direction is used as the flat clamp, the sheet material can be moved laterally easily and smoothly.

  In order to solve the above-described problem, the sheet material cutting device according to the present invention is configured to bring a leading end of a sheet material sent from a feeder to a cutting die into contact with a stopper, and to perform sheeting with a clamp in the feeder and a clamp in the cutting die. In the cutting device that cuts the sheet material to a predetermined length by the cutting blade in the cutting die while restraining the material, the movement of the sheet material in the return direction is restricted between the feeder and the cutting die. Further, a planar clamp for sandwiching the sheet material is provided so as to allow movement in a direction crossing the feeding direction, and a positioning device for positioning the sheet material in the width direction is provided. .

In this cutting apparatus, the flat clamp can be configured to sandwich the sheet material by a pair of upper and lower rotating rollers that rotate about an axis extending in the sheet material feeding direction.
The positioning device includes a pressing unit that engages with one side surface of the sheet material and presses the sheet material in the width direction, and a reference block that receives the other side surface of the sheet material pressed by the pressing unit. It can be configured. In this case, it is desirable that the pressing means has a structure in which the rotating roller is engaged with one side surface of the sheet material.

  According to the sheet material cutting method and the cutting apparatus according to the present invention, the sheet material does not return even when the clamp on the feeder side is opened, and the sheet material is allowed to move laterally. The sheet can be positioned with high accuracy in the direction and the width direction, and a cut sheet having excellent dimensional shape accuracy can be stably obtained.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  1 and 2 show one embodiment of a sheet material cutting method according to the present invention. Since the basic form of this cutting method is the same as the conventional form shown in FIG. 8, the same reference numerals are given to the same parts as those shown in FIG. In the present embodiment, a misalignment correcting device 20 for correcting the lateral displacement of the sheet material 3 is disposed between the feeder 5 and the cutting die 7. The misalignment correcting device 20 includes a flat clamp 23 having a pair of upper and lower rotating rollers 22 that rotate about a shaft 21 extending in the feeding direction A of the sheet material 3, and an upper and lower direction orthogonal to the feeding direction A of the sheet material 3. The pressing means 26 includes a pair of front and rear rotating rollers 25 that rotate about a shaft 24 extending in the direction.

  The upper and lower rotating rollers 22 constituting the plane clamp 23 are provided so as to be able to approach and separate as will be described in detail later, and when the upper and lower rotating rollers 22 approach each other, the sheet material 3 is It is sandwiched between the upper and lower rotating rollers 22. In this case, when the appropriate pressing force F (FIG. 2) is applied to the sheet material 3 from the upper and lower rotating rollers 22, the movement of the sheet material 3 in the feeding direction A is restricted. However, since the upper and lower rotating rollers 22 are free to rotate around the shaft 21 extending in the feeding direction A, when an external force in a direction intersecting the feeding direction A is applied to the sheet material 3, The lower rotating roller 22 rolls on the sheet material 3, thereby allowing the sheet material 3 to move in the lateral direction.

  On the other hand, the rotating roller 25 constituting the pressing means 26 is provided so as to be able to advance and retract in the width direction of the sheet material 3 as will be described in detail later. The rotating roller 25 advances in the direction of arrow B (FIG. 2). Thus, one side surface of the sheet material 3 is pressed and moves in the arrow B direction (lateral direction). Thus, the reference block 13 constituting the positioning device 14 is arranged in the cutting die 7 as described above, and the other side surface of the sheet material 3 moved in the lateral direction is in contact with the reference block 13. As a result, the sheet material 3 is sandwiched between the rotating roller 25 and the reference block 13. In the present embodiment, the rotation roller 25 in the pressing means 26 and the reference block 13 in the positioning device 14 constitute a positioning device for positioning the sheet material 3 in the width direction. Therefore, the reference block 13 is shared by the existing positioning device 14 in the cutting die 7 and the newly set positioning device.

  When cutting the sheet, as described above, the sheet material 3 rewound from the uncoiler 2 is fed to the feeder 5 through the guide roller 4, and sent to the cutting die 7 by the clamp in the feeder 5 and the rotation of the feeding means 6. The tip abuts against the stopper 8 in the cutting die 7. In this cutting method, when the leading edge of the sheet material 3 comes into contact with the stopper 8, first, the flat clamp 23 in the misalignment correcting device 20 is actuated to sandwich the sheet material 3 between the upper and lower rotating rollers 22, Subsequently, the clamp and feeding means 6 of the feeder 5 and the clamp 10 in the cutting die 7 are released. At this time, since an appropriate pressing force F (FIG. 2) is applied to the sheet material 3 from the upper and lower rotating rollers 22, the sheet material 3 does not move in the direction opposite to the feeding direction A, that is, in the return direction. Therefore, the sheet material 3 maintains a state in which the tip thereof is in contact with the stopper 8.

  Next, the rotating roller 25 in the pressing means 26 moves forward and presses one side surface of the sheet material 3. In this case, if the sheet material 3 is displaced in the lateral direction, the sheet material 3 is pushed by the rotating roller 25 to move laterally while rolling the upper and lower rotating rollers 22, and the other side surface is moved to the reference block 13. Abut. As a result, the sheet material 3 is positioned in the width direction so that the side surface is parallel to the feeding direction A. As a result, the lateral displacement is corrected. At this time, the existing pressing means 12 in the cutting die 7 may be actuated, whereby the sheet material 3 is translated in the lateral direction and more accurately positioned in the width direction.

  Thereafter, the sheet material 3 is first clamped by the clamp 10 in the cutting die 7, and then the flat clamp 23 and the pressing means 26 in the misalignment correcting device 20 are actuated again so that the upper and lower rotating rollers 22 are separated from each other. Simultaneously with the movement in the direction, the rotating roller 25 of the pressing means 26 moves backward, so that the deflection of the sheet material 3 is eliminated. Next, the clamp and feeding means 6 in the feeder 5 are clamped, and the coil material 3 is restrained by the clamp 10 in the cutting die 7 and the clamp and feeding means 6 in the feeder 5 before and after. Then, the upper cutting blade 11b in the cutting die 7 moves downward with this constraint maintained, and the sheet material 3 is cut to a predetermined length in cooperation with the lower cutting blade 11a. At this time, since the leading edge of the sheet material 3 is abutted against the stopper 8 and the deflection is eliminated, a desired cutting length can be obtained. In addition, since the positional deviation of the sheet material 3 is corrected by the misalignment correcting device 20, the parallelism and perpendicularity of the cut sheet are sufficiently satisfied.

  Here, the deviation correcting device 20 has a specific structure as shown in FIGS. 3 and 4 as an example. In both figures, reference numeral 30 denotes a gantry, and the flat clamp 23 is arranged along one side edge on the gantry 30, and the pressing means 26 is arranged along the other side edge of the gantry 30. In FIG. 3, G is a groove type guide that guides both side portions of the sheet material 3 fed from the feeder 5 to the cutting die 7. The upper and lower rotating rollers 22 constituting the flat clamp 23 are driven by driving means 32 supported by a support base 31 fixed on the pedestal 30. Here, the driving means 32 is composed of two rodless cylinders, and the upper and lower rotating rollers 22 are connected to a roller frame 34 attached to two output portions 33 of each rodless cylinder via the shaft 21. It is supported rotatably. The operating direction of the two rodless cylinders constituting the driving means 32 is set so as to relatively move the upper and lower rotating rollers 22.

  In the plane clamp 23 configured as described above, the upper and lower rotating rollers 22 are normally positioned at the open positions separated from each other as shown in FIG. When it is necessary to position the sheet material 3 in the width direction as described above, the upper and lower rotating rollers 22 are moved in a direction approaching each other by the driving means 32, and as shown in FIG. The sheet material 3 is clamped by the applied pressure F, and the movement of the sheet material 3 in the return direction is restricted. On the other hand, the upper and lower rotating rollers 22 are free to rotate around a shaft 21 extending in the feeding direction A of the sheet material 3, so that smooth lateral movement of the sheet material 3 is ensured. Further, since the sheet material 3 rolls on the surface of the sheet material 3 according to the lateral movement of the sheet material 3, the sheet material 3 is not damaged. The upper and lower rotating rollers 22 constituting the flat clamp 23 greatly resist the movement of the sheet material 3 in the return direction, but do not generate much resistance to the lateral movement. Of course, other means may be used.

  On the other hand, the pair of rotating rollers 25 constituting the pressing means 26 are driven by a cylinder 41 supported by a support base 40 fixed on the frame 30. A bracket 42 is fixed to the tip of the output shaft 41a of the cylinder 41, and the pair of rotating rollers 25 has the shaft 24 attached to both ends of a roller frame 44 that is pivotally attached to the bracket 42 using pins 43. It is supported so that it can rotate freely. Thus, two springs 45 are interposed between the bracket 42 and the roller frame 44, and the pair of rotating rollers 25 are slightly floating in the horizontal plane with the pin 43 as a fulcrum. In addition, two guide rods 46 extending from the bracket 42 are slidably inserted into the support base 40, and the bracket 42 feeds the sheet material 3 to guide the guide rod 46 according to the operation of the cylinder 41. Translate in a direction perpendicular to direction A.

  In the pressing means 26 configured as described above, the pair of rotating rollers 25 is always positioned at a position in contact with one side surface of the sheet material 3 fed by the feeder 5. At this time, if the sheet material 3 is inclined, the pair of rotating rollers 25 floats following the inclination and contacts the sheet material 3 evenly. When the sheet material 3 needs to be positioned in the width direction as described above, the pair of rotating rollers 25 is advanced by the operation of the cylinder 41, and the sheet material 3 is moved laterally as shown in FIG. The other side is brought into contact with the reference block 13. At this time, the sheet material 3 is pushed at two points by the pair of rotating rollers 25, so that no new inclination occurs in the sheet material 3.

  The clamp and feeding means 6 in the feeder 5 are the same as those in the prior art (FIG. 8). As shown in FIG. 5, as an example, the lower fixed roller 50, the upper movable roller 51, and the movable roller 51 And a drive mechanism 52 that moves the actuator toward and away from the fixed roller 50. Here, the drive mechanism 52 operates on a swinging arm 56 having one end pivotally attached to a support plate 54 fixed on the pedestal 53 of the feeder 5 using a pin 55 and the other end of the swinging arm 56. The cylinder 57 is connected. In the clamp and feed means 6 configured as described above, the fixed roller 50 is rotationally driven by a motor (not shown). Now, the movable roller 51 is operated via the swing arm 56 by the operation of the cylinder 57. When the sheet material 3 is sandwiched between the rollers 50 and 51 and the fixed roller 50 is rotationally driven in this state, the sheet material 3 is moved in the feed direction A at a constant speed. Will be sent. In the feeder 5, there are provided a plurality of support rollers 58 that support the lower surface of the sheet material 3 unwound from the uncoiler 2 and guide it into the clamp and feeding means 6. These bearing rollers 58 are guided in a loop shape.

  Also, the clamp 10 in the cutting die 7 is the same as the conventional one. As shown in FIG. 6 and FIG. 7 as an example, a base 61 arranged in the lower die 60 and a pressing plate 63 arranged in the upper die 62 It is made up of. The pressing plate 63 has a size that covers a portion close to the stopper 8 and a portion close to the upper cutting blade 11 b attached to the upper mold 62, and the sheet carried into the cutting mold 7. The material 3 is pressed against the base 61 by the pressing plate 63 in a wide range as the upper mold 62 is lowered. Thus, the pressing plate 63 is composed of a set of a plurality of pressing blocks 64. Each pressing block 64 is suspended and supported by the upper mold 62 via a spring (not shown), and is stepped so that the side closest to the stopper 8 is the most advanced and the side closest to the upper cutting blade 11b is most retracted. It is positioned. Therefore, when the upper mold 62 is lowered, the sheet material 3 is pressed against the base 61 in order from the pressing block 64 on the side close to the stopper 8, and thereby the sheet material 3 is brought into the cutting mold 7 as shown in the figure. Even if there is a deflection, the sheet material 3 comes to be pressed tightly against the base 61 without enclosing the deflection. The pressing means 12 and the reference block 13 constituting the positioning device 14 in the cutting die 7 are arranged on the lower die 60 so as to face each other. The pressing unit 12 includes a rotating roller 66 driven by a cylinder 65, and presses the sheet material 3 toward the reference block 13 by the advancement of the rotating roller 66. The upper die 62 is moved up and down by the operation of a cylinder 68 installed on the upper support frame 67. In addition, a support plate 69 that supports the sheet material 3 is disposed on the lower mold 60 adjacent to the lower cutting blade 11a constituting the cutting blade 11 so as to float in the vertical direction.

  Here, the reference block 13 in the cutting die 7 that constitutes the positioning device together with the pressing means 26 may be moved into the displacement correcting device 20. In the present invention, the function of the pressing means 26 may be transferred to the pressing means 12 in the cutting die 7. In this case, the existing positioning device 14 provided in the cutting die 7 is used. Therefore, the structure of the misalignment correcting device becomes simple.

It is a top view showing typically an embodiment of a cutting method of a sheet material concerning the present invention. It is a side view which shows typically the embodiment of the cutting method of this sheet material. It is a top view which shows the structure of the deviation correction apparatus which comprises the cutting device of the sheet | seat material which concerns on this invention. It is a front view which shows the structure of the deviation correction apparatus shown in FIG. It is a side view which shows the structure of the clamp in the feeder which comprises the cutting device of the sheet | seat material which concerns on this invention. It is a side view which shows the structure of the clamp in the cutting die which comprises the cutting device of the sheet | seat material which concerns on this invention. It is a top view which shows the cutting | disconnection type | mold lower part structure shown in FIG. It is a top view which shows typically embodiment of the cutting method of the conventional sheet material.

Explanation of symbols

2 Uncoiler
3 Sheet material 5 Feeder 6 Clamp in feeder 7 Cutting die 8 Stopper 10 Clamp in cutting die 11 Cutting blade 12 Pressing means in cutting die 13 Reference block 14 Positioning device in cutting die 20 Displacement correcting device 22 On plane clamp Lower rotating roller 23 Flat clamp 25 Rotating roller of pressing means 26 Pressing means

Claims (6)

  The leading edge of the sheet material sent from the feeder to the cutting die is brought into contact with the stopper, and the sheet material is predetermined by the cutting blade in the cutting die while restraining the sheet material by the clamp in the feeder and the clamp in the cutting die. In the cutting method of cutting to a length, a plane clamp is arranged between the feeder and the cutting die, which restricts movement of the sheet material in the return direction but allows movement in the direction crossing the feeding direction. The sheet material is positioned in the width direction while the sheet material is clamped by the plane clamp prior to the restraint of the sheet material by the clamp in the feeder and the clamp in the cutting die. Sheet material cutting method.   2. The sheet according to claim 1, wherein a pair of upper and lower rotating rollers that rotate about an axis extending in a feeding direction of the sheet material are used as the flat clamp disposed between the feeder and the cutting die. How to cut the material.   The leading edge of the sheet material sent from the feeder to the cutting die is brought into contact with the stopper, and the sheet material is predetermined by the cutting blade in the cutting die while restraining the sheet material by the clamp in the feeder and the clamp in the cutting die. In a cutting device that cuts to length, a planar clamp is provided between the feeder and the cutting die, which restricts movement of the sheet material in the return direction but allows movement in the direction crossing the feeding direction. The sheet material cutting device is further provided with a positioning device for positioning the sheet material in the width direction.   4. The sheet material cutting device according to claim 3, wherein the flat clamp clamps the sheet material by a pair of upper and lower rotating rollers that rotate about an axis extending in the sheet material feeding direction.   The positioning device includes a pressing unit that engages with one side surface of the sheet material and presses the sheet material in a width direction thereof, and a reference block that receives the other side surface of the sheet material pressed by the pressing unit. The sheet material cutting device according to claim 3 or 4. 6. The sheet material cutting device according to claim 5, wherein the pressing means of the positioning device engages the rotating roller with one side surface of the sheet material.

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