JP2014079796A - Die for bending workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die for use in laser assist bending, the die being capable of preventing diffusion of laser beam.SOLUTION: A die 1 for bending a workpiece W is used when the workpiece W is irradiated with a laser beam 29 and the workpiece is bent. The die 1 includes: a body part 5 on the upper surface of which a V-groove 11 is formed; an open hole 7 which penetrates from the bottom of the V-groove to the bottom surface of the body part in order to irradiate the workpiece with the laser beam; and a shutter 9 that is provided in the body part in order to prevent the laser beam with which the workpiece has been irradiated, from leaking to the outside and that is movable in a height direction relative to the body part.

Description

  The present invention relates to a workpiece bending die, and more particularly to a die used for heating a workpiece by laser light to bend the workpiece.

  Conventionally, when bending a material (workpiece) using a die (punch, die), a laser beam is irradiated to the workpiece, and the part to be bent is heated locally to raise the temperature (laser assist) Bending) is known (see, for example, Patent Document 1 and Patent Document 2).

JP-A-5-42337 Japanese Patent Laid-Open No. 5-38324

  By the way, in the conventional laser-assisted bending, it is necessary to prevent the laser light from diffusing due to irregular reflection of the laser light.

  An object of the present invention is to provide a die that can be used for laser-assisted bending that can prevent diffusion of laser light.

  The invention according to claim 1 is a work bending die used when a plate-like work is irradiated with a laser beam to bend the work, and a main body having a V-groove formed on the upper surface. A part, a through-hole penetrating the main body from the bottom of the V-groove to the bottom of the main body, and the laser light irradiated on the work to the outside In order to prevent leakage, the workpiece bending die includes a shutter provided in the main body portion and movable in a height direction with respect to the main body portion.

  According to a second aspect of the present invention, in the work bending die according to the first aspect, the shutter is a work bending die composed of a translucent material.

  According to a third aspect of the present invention, in the work bending die according to the first or second aspect, a plurality of through holes in the main body are provided, and each through hole has a predetermined interval. It is a die that is open and arranged along the longitudinal direction of the main body.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that the spreading | diffusion of a laser beam can be prevented in the die | dye used for laser-assisted bending.

It is a figure which shows schematic structure of the die | dye concerning embodiment of this invention, (a) is a top view of die | dye, (b) is a front view of die | dye, (c) is IC-IC in (b). It is sectional drawing, (d) is an ID arrow directional view in (b). It is a figure which shows the bending process operation | movement of the workpiece | work using a die and a punch. It is a top view of the die | dye which concerns on a modification.

  A workpiece bending die (hereinafter simply referred to as a “die”) 1 according to an embodiment of the present invention is used for laser-assisted bending (laser light is applied to a portion where a plate-like workpiece W is bent). The workpiece W is used together with the punch 3 in a state where the portion to be bent is irradiated and heated (for example, when the workpiece W is subjected to warm bending), and the main body 5, the through-hole 7 and the shutter 9 are connected to each other. It is prepared for.

  Here, for convenience of explanation, a predetermined one direction in the die 1 is a longitudinal direction, a predetermined one direction orthogonal to the longitudinal direction is a width direction, and a predetermined one direction is orthogonal to the longitudinal direction and the width direction. Is the height direction.

  A V-shaped groove 11 is formed on the upper surface of the main body 5 formed in a rectangular parallelepiped shape. The through hole 7 penetrates the main body part 5 in the height direction of the main body part 5 from the bottom of the V groove 11 to the bottom surface of the main body part 5 in order to irradiate laser beam to the part where the workpiece W is bent. .

  The shutter 9 leaks laser light irradiated onto the workpiece W (for example, laser light diffusely reflected by the workpiece W or the like) (particularly, leaks outside the V groove 11 of the die 1 on both sides in the width direction of the die 1). In order to prevent this, the main body 5 is provided at the end in the width direction. The shutter 9 is movable in the height direction with respect to the main body 5.

  The wavelength of the laser light is different from, for example, the wavelength of visible light, and the shutter 9 is a material that blocks light of the wavelength of the laser light and is translucent to visible light (may be transparent). It is configured. Moreover, the shutter 9 is comprised with the laser protection filter, for example, is an absorption type filter.

  The die 1 is provided with a biasing portion 13. The urging unit 13 urges the shutter 9 upward so that the shutter 9 protrudes above the upper surface of the main body unit 5.

  The main body 5 has a shape in which a V-shaped groove 11 recessed downward is provided on the upper surface of a rectangular parallelepiped. The V-shaped groove 11 extends in the longitudinal direction of the main body portion 5 and is formed over the entire length of the main body portion 5, and is located at the center in the width direction of the main body portion 5. The upper surface 15 of the main body 5 where the V-groove 11 is not formed is formed in an elongated rectangular shape and extends in the horizontal direction, and along the V-groove 11 on both sides of the V-groove 11 in the width direction of the main body 5. It is elongated.

  The through hole 7 is formed in an oval shape when viewed from the height direction (vertical direction) of the die (main body portion), and extends long in the same direction as the V groove 11. When viewed from the height direction of the die 1, the center in the width direction of the oval through-hole 7 and the center in the width direction of the V-groove 11 (main body portion 5) coincide with each other, and the oval through-hole The width of the hole 7 is narrower than the width of the V groove 11. Further, when viewed from the height direction of the die 1, the center in the longitudinal direction (length direction) of the oval through-hole 7 and the center in the extending direction (longitudinal direction) of the V-groove 11 coincide with each other. The length of the oval through-hole 7 is shorter than the length of the V-groove 11 (the length of the main body 5).

  The shutter 9 is formed in, for example, a rectangular flat plate shape. The horizontal dimension of the rectangular flat shutter 9 is slightly smaller than the height dimension of the main body 5, and the vertical dimension is substantially equal to the length dimension of the main body 5. It has become.

  In the shutter 9, the thickness direction coincides with the width direction of the main body portion 5, the horizontal direction coincides with the height direction of the main body portion 5, and the vertical direction coincides with the length direction of the main body portion 5. For example, both side surfaces 17 of the main body 5 in the width direction are arranged such that one end coincides with one end in the length direction of the main body 5 and the other end in the vertical direction coincides with the other end in the length direction of the main body 5. However, one piece is provided for each (two pieces in one main body 5).

  Further, a pressing member 19 is integrally provided at both ends in the longitudinal direction of the main body 5, and portions on both ends in the longitudinal direction of the shutter 9 are sandwiched between the distal end portion of the pressing member 19 and the main body 5. It is. More specifically, the dimension of the gap 21 between the front end portion of the pressing member 19 and the main body 5 is slightly larger than the thickness dimension of the shutter 9. The portions on both ends in the longitudinal direction of the shutter 9 enter the gap 21, the shutter 9 is supported by the pressing member 19, and the shutter 9 moves slightly away from the side surfaces 17 and moves relative to the main body 5 in the vertical direction. It has become. Moreover, the shutter 9 is replaceable, for example.

  The urging portion 13 is constituted by, for example, a long wave-shaped spring 23 formed. The wave spring 23 is formed in a shape obtained by bending an elongated strip-shaped material into, for example, a sine wave shape (or a triangular wave shape with corners having arc shapes). And it has elasticity in the amplitude direction of the wave.

  Protruding portions 25 for supporting the wave springs 23 are provided at both ends in the width direction of the main body portion 5 at the lower end of the main body portion 5. The protruding portion 25 protrudes from the side surface 17 of the main body portion 5 in the width direction of the main body portion 5, for example, over the entire length in the longitudinal direction of the main body portion 5.

  The wave spring 23 is installed in the main body 5 such that the longitudinal direction thereof coincides with the longitudinal direction of the main body 5 and the amplitude direction of the wave coincides with the height direction of the main body 5.

  The wave spring (installed wave spring) 23 installed in the main body 5 has one end in the wave amplitude direction in contact with the protrusion 25 of the main body 5 and the other end in the wave amplitude direction in contact with the lower end of the shutter 9. ing. The shutter 9 is urged upward.

  In the die 1, when no external force is applied to the shutter 9 or the like (initial state), the shutter 9 protrudes upward from the upper surface of the main body 5 by a predetermined distance. Further, in the initial state, the upper end of the shutter 9 is located above the extended surface obtained by extending the slope of the V groove 11, and the lower end of the shutter 9 is located below the upper surface 15 of the main body 5. .

  When the flat workpiece W is placed on the die 1 in the initial state, for example, the shutter 9 is pushed downward by the weight of the workpiece W, the wave spring 23 is elastically deformed, and the shutter 9 moves downward. ing. When the lower surface of the flat workpiece W comes into contact with the upper surface 15 of the main body portion 5, the height position of the upper end of the shutter 9 matches the height position of the upper surface 15 of the main body portion 5.

  After the work W has been installed on the die 1, when the work W is bent by lowering the punch 3, the work W is bent so that the part of the work W (the part in contact with the shutter 9) moves upward. However, the shutter 9 is also urged upward by the wave spring 23 so as to always rise in contact with the workpiece W.

  Instead of the wave spring 23, another elastic body such as a coil spring may be employed, or a single acting cylinder driven by a compressed fluid such as air pressure may be employed.

  An optical system 27 for irradiating the workpiece W with laser light emitted from a laser light generator (not shown) is provided below the main body 5 of the die 1 and comes out upward from the optical system 27. The laser beam 29 passes through the through hole 7 and is irradiated to the bending line of the workpiece W placed on the die 1 (main body portion 5) and bent.

  As shown in FIG. 2, since the distance between the optical system 27 and the bending line of the workpiece W changes as the workpiece W is bent, the laser beam 29 is focused at the bending line of the workpiece W. The optical system 27 may be configured so that

  Next, the bending operation of the workpiece W using the die 1 and the punch 3 will be described.

  First, in the initial state, as shown in FIG. 2A, the punch 3 and the shutter 9 are raised, and the laser beam is not irradiated.

  In the initial state, when the workpiece W is placed on the die 1, the shutter 9 is lowered as shown in FIG. 2B, and the lower surface of the workpiece W is in contact with the upper surface 15 of the main body 5 of the die 1.

  Subsequently, irradiation of the laser beam 29 onto the workpiece W is started. After a predetermined time has elapsed from the start of the irradiation with the laser beam 29 and the temperature of the bending line portion of the workpiece W has risen to a predetermined temperature, the punch 3 starts to descend, and the punch 3 is lowered to a predetermined position. Then, the workpiece W is bent.

  Subsequently, the irradiation of the laser beam 29 is stopped, the punch 3 is raised, the workpiece that has been bent is removed from the die 1, and the bending of the workpiece W is completed.

  Note that the timing of stopping the irradiation of the laser beam 29 may be adopted immediately before starting the lowering of the punch 3 or when the punch 3 is being lowered.

  According to the die 1, since the shutters 9 are provided on both sides in the width direction of the die 1, the laser light used in laser-assisted bending by the shutter 9 can be blocked, and the diffusion of the laser light (from the die 1) (Diffusion to the outside) can be prevented.

  Further, since the shutter 9 is urged by the urging portion 13 so as to protrude upward from the upper surface 15 of the main body portion 5 of the die 1, the shutter 9 is moved from the start to the end of the bending process of the workpiece W. It is possible to reliably prevent the laser light from diffusing during the period from the start to the end of bending of the workpiece W by always contacting the workpiece W.

  In addition, by configuring the die 1 so that the shutter 9 can be replaced, even if the wavelength of the laser beam used in laser-assisted bending changes, it is possible to reliably prevent the laser beam from diffusing. For example, when laser-assisted bending is performed using a laser beam having a wavelength of about 10 μm, a shutter 9 made of a material that absorbs an electromagnetic wave having a wavelength of about 10 μm is used, and the laser beam having a wavelength of about 1 μm is used. When laser assisted bending is performed, the diffusion of the laser light can be reliably prevented by replacing the shutter 9 made of a material that absorbs an electromagnetic wave having a wavelength of about 1 μm.

  Further, according to the die 1, since the shutter 9 is made of a material that is translucent to visible light, the behavior of the workpiece W during bending can be visually observed. Can be prevented in advance.

  Further, a driving unit may be provided instead of the urging unit 13 and the shutter 9 may be moved up and down. For example, the shutter 9 may be moved up and down by an actuator such as a pneumatic cylinder. When the workpiece W is placed on the die 1, the shutter 9 is positioned at the lower end (position where the upper end of the shutter 9 is below the upper surface 15 of the main body 5), and after the workpiece W is placed. Even when the punch 3 is lowered and the punch 3 and the workpiece W come into contact with each other and the clamping of the workpiece W by the die 1 and the punch 3 is started, the shutter 9 is raised (biased upward). Good.

  Incidentally, in the die 1 described above, only one through hole 7 is provided, but a plurality of through holes 7 may be provided in the main body 5 as shown in FIG. In this case, each through-hole 7 shall be arrange | positioned along with the longitudinal direction of the main-body part 5 at predetermined intervals.

  More specifically, when viewed from the height direction (vertical direction) of the die 1 (main body portion 5), the through-holes 7 are formed in a circular shape, and are aligned in the longitudinal direction of the main body portion 5 at a predetermined pitch. Is arranged. Further, when viewed from the height direction of the die 1, the center of the circular through hole 7 and the center of the V groove 11 (main body portion 5) in the width direction coincide with each other. The diameter is narrower than the width of the V groove 11.

  Thus, by arranging the plurality of through holes 7 in the longitudinal direction of the main body portion 5 with a predetermined interval, it is possible to prevent the strength of the die 1 from being lowered and to perform coining on the workpiece W. You can also In this case, since the laser beam is irradiated onto the workpiece W through each through-hole 7, the laser beam is not irradiated continuously over the entire length of the bending line of the workpiece W, but is irradiated intermittently. However, the portion of the bend line of the work W is heated substantially uniformly over the entire length of the bend line by heat conduction in the work W, so that laser-assisted bending can be performed without any trouble.

  When the length of the bending line of the workpiece W is longer than the longitudinal dimension of the die 1, the die 1 (punch 3) shown in FIG. 1 or FIG. The workpiece W may be bent.

DESCRIPTION OF SYMBOLS 1 Die for work bending process 5 Main-body part 7 Through-hole 9 Shutter 11 V groove 29 Laser beam W Workpiece

Claims (3)

In a work bending die used when bending a workpiece by irradiating a plate-like workpiece with laser light,
A main body having a V-groove formed on the upper surface;
A through-hole penetrating the main body from the bottom of the V-groove to the bottom of the main body to irradiate the workpiece with the laser beam;
In order to prevent the laser light applied to the workpiece from leaking to the outside, a shutter provided in the main body and movable in the height direction with respect to the main body,
A die for bending a workpiece characterized by comprising: The die for workpiece bending according to claim 1,
A die for bending a workpiece, wherein the shutter is made of a translucent material. In the die for bending a workpiece according to claim 1 or 2,
2. A die according to claim 1, wherein a plurality of through holes are provided in the main body, and each through hole is arranged along the longitudinal direction of the main body at a predetermined interval.

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