JP2014151363A - Torsion processing method for long workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torsion processing method for long workpieces capable of performing torsion processing easily on a pipe-shape long workpiece.SOLUTION: A torsion processing method for long workpieces comprises a step of heating the outer sides of long workpieces 1, 5 and 7 along continuous or intermittent spiral lines 2, 4, 6 and 8 turning around the long workpieces 1, 5 and 7. The working target is the pipe-shaped long works 1 and 5 constituted of side walls surrounding the inner side completely, or the channel-type long workpiece 7 constituted of a side wall enclosing the inner side partially.

Description

  The present invention relates to a method for twisting a long workpiece that causes twisting of a long workpiece composed of a side wall that completely or partially surrounds the inside.

  2. Description of the Related Art Conventionally, a laser forming technique is known in which a metal plate is irradiated with a laser beam and bent using plastic deformation caused by thermal stress. According to this technique, it can be processed into various shapes according to the irradiation locus and the irradiation amount of the laser beam.

  For example, Patent Document 1 discloses a spherical shape, an egg shape, a rugby ball shape, or the like by irradiating a metal plate with laser light in a concentric shape, a spiral shape, an elliptical shape, or the like so as to draw multiple closed curves. It is described that a free-form surface can be formed.

Japanese Patent Laid-Open No. 05-042337

  However, as processing using the laser beam as described above, processing that causes deformation in the direction of twisting the pipe-shaped long workpiece has not yet been performed. If such a twisting process can be performed, it is possible to easily perform a process that requires correction of an error in the twisting direction generated in the long workpiece or a deformation in the twisting direction by simply irradiating the laser beam. So it is convenient.

  In view of the problems of the prior art, the present invention is to provide a method of twisting a long workpiece that can be easily twisted on a pipe-shaped long workpiece.

  The twisting method for a long workpiece according to the present invention is a method for twisting a long workpiece composed of a side wall that completely or partially surrounds the inside, and is a continuous or intermittent spiral that goes around the outside of the side wall. The outside of the long workpiece is heated along a line.

  Here, “a long work composed of a side wall that completely or partially surrounds the inside” refers to a long work such as a round pipe or a square pipe that is composed of a pipe-like side wall that completely surrounds the inside. In addition, a channel-type long workpiece composed of three side walls partially covering the inside also corresponds.

  Further, the “spiral line” means a space curve that can be formed when traveling in the axial direction while rotating outside the long workpiece. Therefore, the “spiral line” includes, for example, a spiral space curve formed when advancing at a constant speed in the axial direction while turning around the side surface of a round pipe-like long workpiece, and a square pipe shape. With respect to the space curve that can be made when traveling along each side of a long workpiece at a constant speed in the direction of its axis, and each intersection line (side ridge) where each side of a rectangular pipe-like long workpiece intersects A spatial curve composed of straight lines intersecting at a certain angle is included.

  In the present invention, the heated portion of the long workpiece expands when heated, and plastically deforms by contracting more than before heating when cooled. And since a heating is performed along a spiral line, the plastic deformation which arises in each heating part on this line arises. Thereby, the long workpiece is deformed in the twisting direction as a whole.

  Therefore, according to the present invention, the long workpiece can be easily twisted only by heating the outside of the long workpiece in a spiral shape. The amount of deformation in this twisting process can be adjusted by appropriately selecting the helical pitch, the degree of heating, and the like.

  In the present invention, the outside of the long workpiece may be heated by a heating coil using laser light or high frequency electromagnetic induction. According to this, twisting can be easily performed using a laser device or a high-frequency induction heating coil that is used in a conventional bending process by heating.

It is a perspective view which shows the twist processing method of the long workpiece | work which concerns on 1st Embodiment of this invention. It is a perspective view which shows the torsion processing method of the long workpiece | work which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the twist processing method of the elongate workpiece | work which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the torsion processing method of the long workpiece | work which concerns on 4th Embodiment of this invention. It is a perspective view which shows a mode that the heating coil is used for the heating of a elongate workpiece | work.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the long workpiece twisting method according to the first embodiment heats the outer periphery of the long workpiece 1 along a continuous spiral line 2 that goes around the long workpiece 1. A process is provided. The long workpiece 1 is a rectangular pipe-like shape and is composed of four side walls that completely surround the inside.

  The long workpiece 1 has a shape curved in the length direction. The long workpiece 1 is made of a material such as a metal that expands when heated and contracts and then plastically deforms during subsequent natural cooling.

  As shown in FIG. 1, the spiral line 2 is a straight line on each side surface that forms a certain angle α with respect to each of the four side ridges 3 that are lines of intersection between adjacent side surfaces of the long workpiece 1. Are configured as continuous.

  Laser light L is used for heating the long workpiece 1. For example, the heating is performed by moving the long workpiece 1 so that the laser beam L is irradiated along the spiral line 2 while irradiating the laser beam L in a certain direction. Can be performed. The movement of the long workpiece 1 includes rotational movement around the axis and movement in the axial direction.

  However, since the long workpiece 1 is curved, the axis of the portion of the long workpiece 1 irradiated with the laser beam L is always constant with respect to the laser beam L while the laser beam L is irradiated on the long workpiece 1. The positional relationship between the long work 1 and the light source of the laser beam L is adjusted so that the positional relationship is maintained.

  When the long workpiece 1 is twisted, the laser beam L is applied to the long workpiece 1 so that the heating by the irradiation of the laser beam L is performed along the spiral line 2 in this way. Irradiated. At this time, the portion of the long work 1 that is sequentially heated by the irradiation of the laser beam L expands during heating, and contracts and plastically deforms before heating during subsequent natural cooling.

  Thereby, the long workpiece 1 is deformed so as to be twisted. The direction of twisting is such that each moving position turns in the direction in which each moving position turns relative to the moving direction when moving from one end of the long work 1 toward the other end on the spiral line 2. The direction is such that the end of the body rotates. That is, the long work 1 is deformed in the direction of twisting along the spiral as a whole. Therefore, the twist direction of the long workpiece 1 is determined by the spiral turning direction.

  In the example of FIG. 1, when moving on the spiral line 2 from one end of the long work 1 toward the other end, each moving position turns clockwise with respect to the moving direction. For this reason, as shown by the arrow A, the long workpiece 1 is deformed such that when viewed from one end portion, the other end portion is twisted in the clockwise rotation direction.

  The amount of torsional deformation varies depending on the size and shape of the cross section of the long workpiece 1, the irradiation amount of the laser light L on the long workpiece 1, the pitch P of the spiral line 2 formed by the heated portion, and the like. Therefore, when the long workpiece 1 is twisted, the irradiation amount and irradiation of the laser beam L are determined according to the geometrical form and properties of the long workpiece 1 and the amount of torsional deformation to be applied to the long workpiece 1. The number of times, the helical pitch P, etc. are selected.

  According to the long workpiece twisting method of the present embodiment, the laser beam L having an appropriate irradiation amount along the spiral line 2 in an appropriate pitch P and a turning direction with respect to the curved long workpiece 1. The desired twist direction and the desired amount of torsional deformation can be generated for the long workpiece 1 simply by irradiating the long workpiece 1.

  Therefore, for example, even when the curved center axis of the long work 1 does not exist on one plane due to an error generated during manufacturing, the long work 1 is deformed in the torsional direction. The shape of the long workpiece 1 can be corrected so that the central axis exists on one plane.

  Further, in the production of a small lot product using the long workpiece 1, when it is necessary to apply a predetermined amount of twisting to the long workpiece 1 in a predetermined twisting direction, the laser beam L is applied to the long workpiece 1. Such a twisting process can be easily applied to the long workpiece 1 only by appropriately irradiating 1.

  FIG. 2 is a perspective view showing a method for twisting a long workpiece according to the second embodiment of the present invention. In this embodiment, the irradiation of the laser beam L on the long work 1 is intermittently performed along the intermittent spiral line 4. Other points are the same as in the case of the first embodiment described with reference to FIG. Also by this, as in the case of the embodiment of FIG. 1, the long workpiece 1 can be easily twisted in a desired direction and a desired amount.

  FIG. 3 is a perspective view showing a method for twisting a long workpiece according to the third embodiment of the present invention. In this embodiment, the long workpiece 5 to be twisted is different from the long workpiece 1 in the above-described embodiment of FIG. 1 or FIG. That is, the long workpiece 5 is of a round pipe type composed of pipe-like side walls that completely surround the inside.

  In the present embodiment, the spiral line 6 along which the heating by the laser beam L is performed is a spiral helix formed when traveling at a constant speed in the axial direction while rotating around the side surface of the long workpiece 5. It becomes.

  Therefore, in the case of the present embodiment, the long workpiece 5 is moved with respect to the laser light L at a predetermined speed in the length direction and at a predetermined rotation speed around the axis line, thereby along the spiral line 6. Heating can be performed. About another point, it is the same as that of the case of 1st Embodiment demonstrated using FIG. Also in this embodiment, a desired twist direction and a desired amount of twist processing can be easily performed on the long workpiece 5.

  FIG. 4 is a perspective view showing a method for twisting a long workpiece according to the fourth embodiment of the present invention. In the present embodiment, the long workpiece 7 to be twisted is of a channel type whose cross section is a U-shape. That is, the long work 7 is composed of three side walls that partially surround the inside. In this case, the laser beam L is irradiated only on the outside of the three side walls of the long workpiece 7 and is not irradiated on the inside.

  Therefore, the spiral line 8 indicating the locus of heating by the laser beam L is intermittent. Also in the present embodiment, the long workpiece 7 can be easily twisted in a desired direction and a desired amount.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the pipe-shaped long workpiece constituted by the side wall that completely surrounds the inner side to be processed by the twisting method according to the present invention is not limited to a rectangular or circular cross section, but a polygonal one, It may be semicircular or elliptical.

  Further, the long workpiece to be machined is not limited to a pipe type or a channel type, and may be an angle type having a L-shaped cross section. In this case, the long workpiece is composed of two side walls partially surrounding the inside. Further, for heating a long work, a heating coil 9 using high frequency electromagnetic induction may be used as shown in FIG.

  DESCRIPTION OF SYMBOLS 1, 5, 7 ... Long work, 2, 4, 6, 8 ... Spiral line, 9 ... Heating coil, L ... Laser beam.

Claims (2)

  A method of twisting a long workpiece comprising a side wall that completely or partially encloses the inside, the outer side of the long workpiece along a continuous or intermittent spiral line that goes around the outside of the side wall A method of twisting a long workpiece, characterized by heating the substrate.   The method for twisting a long workpiece according to claim 1, wherein the heating of the outside of the long workpiece is performed by a heating coil using laser light or high frequency electromagnetic induction.

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