JPH11342421A - Method and device for press part annealing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an annealing method for press parts wherein the deterioration of shape and accuracy of a press molded press part arising from a remained strain energy, at a molded part especially can be prevented. SOLUTION: A press part 22 being fixed on a X-Y table unit with a correction jig 20 is annealed so that an elastic strain energy remained in the press part 22 can be dissolved by irradiating the part with a laser light continuously or on a spot. By doing so, the shape and accuracy of the press part 22 can be restored and maintained, or improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for annealing a pressed part, and more particularly to an annealing method and an annealing apparatus for a pressed part in which elastic strain energy remaining in the pressed part is eliminated.

[0002]

2. Description of the Related Art Pressed parts are used as chassis for various electronic and precision instruments. The pressed part is formed by stamping a sheet metal made of, for example, cold-rolled steel into a predetermined shape and working the sheet metal into a predetermined shape by plastic working. By such press molding, parts such as a chassis can be manufactured with high efficiency.

[0003]

In order to obtain the shape accuracy of such a pressed part made of sheet metal or to maintain the accuracy, manual punching, bumping, or rib forming is performed in the same mold or in another mold. Had been. However, such a method did not produce a sufficient effect.

When a pressed part is held in a press die, the shape accuracy of the pressed part is maintained by the forcing force of the die. The elastic strain energy stored in the pressed part is eliminated, whereby the shape and precision are changed from those in the mold, and the shape and precision are deteriorated.

Correction of a pressed part by a press die is limited to only a flat part of the pressed part and a part having a small elastic strain energy, and a large elastic strain energy such as a bead or an embossed part having a double curved surface. It was extremely difficult to perform on the site. There is also a method of reducing the material area of the molded part and thereby reducing the distortion,
Sufficient effects have not been obtained.

The present invention has been made in view of the above problems, and provides an annealing method and an annealing apparatus for a pressed part which enable a pressed part to achieve a predetermined shape and accuracy. The purpose is to:

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided an annealing method for a press part, wherein a predetermined portion of a press-formed press part is irradiated with an energy beam so as to eliminate elastic strain energy. It is about the method.

A laser beam may be irradiated as an energy beam. The energy beam may be applied continuously or in spots according to the shape and dimensions of the pressed part. Further, the pressed part may be fixed by a straightening jig so as to maintain the same shape and accuracy as in the press mold.

The invention relating to the apparatus comprises an energy beam irradiating means for irradiating an energy beam, a jig for holding a press-formed press part, and a positioning means for positioning the jig for holding the press part. The present invention relates to an annealing device for pressed parts.

The energy beam irradiating means may irradiate a laser beam and have a means for adjusting a focal length of the laser beam. Further, the jig may be constituted by a correction jig, and the pressed part may be fixed so as to maintain the same shape and accuracy as when it is in a press die. The positioning means may comprise an XY table, and may position the pressed component in the X-axis direction and the Y-axis direction in a plane orthogonal to the direction of irradiation of the energy beam.

A preferred aspect of the present invention is to eliminate the residual elastic strain energy due to the press forming of a sheet metal part comprising a pressed part, thereby realizing the same shape and precision as the pressed part in the press die. Annealing is performed by an energy beam, particularly a laser beam. Here, the laser generator for annealing itself is fixed without moving, and the irradiation distance of the laser beam is adjusted to a required position on a plane by an XY table by numerical control and according to the height of the pressed part. Adjustment is performed by numerical control, and annealing is performed by irradiating a laser beam to the molded part of the pressed part.

The laser beam may be applied to the three-dimensional shaped part of the pressed part continuously or in the form of a spot according to the shape and dimensions. Further, it is preferable that the correction jig placed on the XY table has a structure capable of maintaining the same shape and accuracy as when the pressed part is in the mold, and has a structure that does not hinder the irradiation of the laser beam.

According to such an embodiment, it is possible to easily maintain and improve the shape accuracy of a stamped part, particularly a sheet metal part, whose shape and accuracy could not be improved conventionally. Therefore, application of the present invention to sheet metal chassis greatly contributes to improvement of the flatness.

[0014]

FIG. 1 schematically shows an entire annealing apparatus according to an embodiment of the present invention.
This device includes an XY table unit 10.
The XY table unit 10 includes a base 11, an X-axis direction moving table 12 disposed thereon, and a Y-axis direction moving table 13. Then, the X-axis direction moving table 12 and the Y-axis direction moving table 13 are driven by the corresponding AC servomotors 14 and 15, respectively, so as to move in the X-axis direction and the Y-axis direction, respectively.

The correction jig 20 is mounted on the XY table unit 10 in a fixed state. The correction jig 20 has a presser 21 on the upper side thereof, and the presser 21 taken out from the press die is pressed by the presser 21. An opening 23 is formed at a predetermined position in the presser 21, and a laser beam is irradiated through the opening 23 (see FIG. 5).

The annealing apparatus irradiates a laser beam as an energy beam, and particularly includes a laser oscillator unit 27. The laser light emitted from the oscillator unit 27 is reflected by a mirror 28, the focus is adjusted by an objective lens unit 29, and the press component 22 on the correction jig 20 is focused.

The AC servo motors 14 and 15 of the XY table unit 10, the laser oscillator unit 27, and the objective lens unit 29 are controlled by a numerical control unit 32. A power supply unit 33 is provided for driving the entire device.

As described above, the annealing apparatus according to the present embodiment includes the XY table unit 10, the correction jig 20, the objective lens unit 29, the mirror 28, the laser oscillator unit 27, the numerical control unit 32, and the power supply unit 33. It is configured.

On the other hand, for example, a work made of a pressed sheet metal part as shown in FIG. 2, that is, a pressed part 22 is placed in a straightening jig 20 shown in FIGS. 1 and 5, and is pressed from above by a presser 21. The shape accuracy is maintained as in the press mold. Here, the shape accuracy includes flatness, parallelism, squareness, straightness and the like. The presser 21 of the correction jig 20 is provided with an opening 23 or a notch through which a laser beam passes according to a protrusion or a dent of the bead 38, the emboss 39, etc. of the pressed component 22. 20 is X
-Fixed on the Y table unit 10;

The processing conditions and processing by such a device are programmed and set in advance in the numerical control unit 32. Thereby, the numerical control unit 3
2. The XY table unit 10, the laser oscillator unit 27, the mirror 28, and the objective lens unit 29 are operated, and a laser beam is continuously or spot-likely applied to a required forming part of the pressed part 22 or in the vicinity thereof. Irradiation is performed for annealing.

As shown in FIGS. 2 and 3, when a formed portion such as a bead 38 or an embossed portion 39 is formed on a pressed part 22 of a sheet metal by press working, elastic strain energy is accumulated inside due to plastic deformation of the portion. . Stamped parts 2
When 2 is in the press mold, the pressed part 22 maintains flatness due to the forcing force of the press mold.

However, once such a pressed part 22 is taken out of the press die, it is deformed as shown in FIG. 4 by the elastic strain energy of the formed part, and the flatness is lost. Since the elastic strain energy is concentrated on the formed part of the pressed part 22, the flatness of the pressed part 22 may be lost by annealing the formed part to eliminate the elastic strain energy. Disappears.

As shown in FIG. 4, a pressed part 22 whose flatness is impaired by elastic strain energy is placed in a straightening jig 20 as shown in FIG.
The pressed part 22 is forcibly pressed in the same manner as when it was in the press die. Therefore, the laser beam is continuously or spot-irradiated onto the molded portion such as the bead 38 or the emboss 39. Such laser annealing eliminates the elastic strain energy of the sheet metal forming part. Therefore, when the pressed part 22 is taken out from the straightening jig 20 after this,
Pressed part 22 returns to the same accuracy and shape as it was in the press mold.

As the pressed part 22 whose elastic strain energy is eliminated by such an annealing device,
This is particularly effective for correcting the flatness of a chassis such as an audio chassis or a computer device, or a chassis that does not have a good space factor if left flat. Then, it is possible to maintain and improve the shape accuracy of various sheet metal parts, which could not achieve the shape accuracy improvement by the press die. Therefore, the apparatus is optimal for improving the flatness of sheet metal chassis.

[0025]

As described above, the present invention eliminates elastic strain energy by irradiating a required part of a press-formed press part with an energy beam to anneal it.

Therefore, by eliminating such elastic strain energy, the shape and precision of the press-formed pressed part can be improved.

According to the configuration in which laser light is irradiated as an energy beam, annealing is performed by such laser light, and elastic strain energy is eliminated.

According to the configuration in which the energy beam is continuously or spotwise irradiated in accordance with the shape and dimensions of the pressed part, the elastic strain energy can be effectively eliminated.

According to the configuration in which the pressed part is fixed by the straightening jig so as to maintain the same shape and accuracy as when it is in the press die, the above-described irradiation of the energy beam in such a state allows The shape and precision are given to the pressed parts as they are.

The invention relating to the apparatus comprises an energy beam irradiating means for irradiating an energy beam, a jig for holding a press-formed press part, and a positioning means for positioning the jig for holding the press part. It is like that.

Accordingly, while the pressed part is held by the jig and the energy beam is irradiated while the positioning is performed by the positioning means, the predetermined position of the pressed part is annealed.

According to the configuration in which the energy beam irradiating means irradiates the laser beam and has a means for adjusting the focal length of the laser beam, the laser beam is radiated so as to be focused on a desired position of the pressed part. To perform annealing.

According to the configuration in which the jig is composed of a straightening jig and the pressed part is fixed so as to maintain the same shape and accuracy as when it is in the press die, the same as when it is in the press die. Annealing of the pressed parts will be performed to obtain the shape and accuracy.

According to a configuration in which the positioning means is composed of an XY table and positions the pressed component in the X-axis direction and the Y-axis direction in a plane perpendicular to the direction of irradiation of the energy beam, such positioning is achieved. Thereby, it is possible to irradiate a desired position of the pressed part with the energy beam.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall configuration of an annealing device.

FIG. 2 is an external perspective view of a pressed part.

FIG. 3 is a longitudinal sectional view of the same.

FIG. 4 is a longitudinal sectional view of a pressed part deformed by elastic strain energy.

FIG. 5 is a longitudinal sectional view of the correction jig showing a state of annealing.

[Explanation of symbols]

10 ‥‥ XY table unit, 11 ‥‥ base, 1
2 ‥‥ X-axis movement table, 13 ‥‥ Y-axis movement table, 14 ‥‥ AC servo motor (X-axis), 15 ‥‥
AC servo motor (Y-axis), 20 ‥‥ straightening jig, 21 ‥
‥ Presser, 22 ‥‥ Pressed part, 23 ‥‥ Opening, 27 ‥‥
Laser oscillator unit, 28 ‥‥ mirror, 29 ‥‥ objective lens unit, 32 ‥‥ numerical control unit, 33 ‥‥
Power supply unit, 37 ° curved part, 38 ° bead, 39
‥‥ emboss, 40 ‥‥ overhang

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C21D 1/34 C21D 1/34 H

Claims (8)

[Claims] 1. A method for annealing a pressed part, comprising: irradiating an energy beam to a desired portion of a pressed part to eliminate elastic strain energy. 2. The method according to claim 1, wherein a laser beam is irradiated as an energy beam. 3. The method for annealing a pressed part according to claim 1, wherein the energy beam is continuously or spotwise irradiated according to the shape and size of the pressed part. 4. The method according to claim 1, wherein the pressed part is fixed by a straightening jig so as to maintain the same shape and accuracy as when the pressed part is in a press die. 5. A press part comprising: an energy beam irradiation means for irradiating an energy beam; a jig for holding a press-formed press part; and a positioning means for positioning the jig for holding the press part. Annealing equipment. 6. An apparatus according to claim 5, wherein said energy beam irradiation means irradiates a laser beam and has a means for adjusting a focal length of the laser beam. 7. An annealing apparatus for a press part, wherein said jig is constituted by a straightening jig, and said press part is fixed so as to maintain the same shape and accuracy as in a press die. 8. The apparatus according to claim 1, wherein said positioning means comprises an XY table, and positions the pressed part in the X-axis direction and the Y-axis direction in a plane perpendicular to the direction of irradiation of the energy beam. 6. The annealing device for a press part according to 5.