JP2750293B2 - Manufacturing method of molded article and molded article - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
The present invention relates to a method for manufacturing a molded product in which a laser beam is moved while being irradiated along the butt line and welded, and the welded plate material is pressed, and a molded product manufactured by the manufacturing method. [0002] Energy density of the prior art laser light, that is,
As shown in FIG. 4 , the energy of the laser light is distributed axially symmetrically with respect to the optical axis within the diameter of the laser light. Therefore, as shown in FIG. 5, when the two plate materials 1 and 2 are butted and the laser beam 4 is applied to the butting line 3, uniform energy is distributed to both sides of the butting line 3. There is no problem in the case where the two plate materials 1 and 2 have the same plate thickness, but as shown in FIG. 5 , there is a case where the plate thickness is different or a difference in the plate thickness occurs partially due to the variation in the plate thickness. In such a case, since the energy for melting the thick plate side (plate material 1) is relatively short, it is not sufficiently melted compared to the thin plate side (plate material 2), and as shown in FIG. The shape of the part 6 is obtained. [0004] However, in the case of a welded portion having an acute step 5, the part of the acute step 5 can bite a press forming die (not shown) at the time of post-forming press forming. There was a mold galling problem that caused damage. Further, when a force is applied to a product obtained by press molding, there is a problem that stress concentration is remarkable due to the relative energy shortage, and as a result, strength is reduced. An object of the present invention is to butt two plate materials having different plate thicknesses in such a manner that one surface thereof is shifted from each other, and the laser is moved along the butt line to the side where the one surface is shifted from each other. It is an object of the present invention to solve the problem of die galling caused by press forming and the problem of strength reduction due to stress concentration caused by relative energy shortage in a method of manufacturing a molded product which is moved while being irradiated with light and welded. SUMMARY OF THE INVENTION According to the present invention, two surfaces of two plate materials having different plate thicknesses are butted against each other while being shifted from each other, and the one surface is moved along the abutting line. the manufacturing method of a molded article to be welded is moved while irradiating the laser beam on the side shifted from each other, and the energy of the laser beam irradiated to a thickness of greater sheet larger than the energy of thickness small plate, A welding step of welding the two sheet materials while melting a corner formed at the abutting portion of the large sheet material and the small sheet material, and pressing the plate material welded by the welding step And a pressing step of applying Further, according to the present invention, two surfaces of two plate materials having different thicknesses are abutted to each other while being shifted from each other, and the energy of the laser beam applied to the plate material having a large thickness is reduced. The two plate materials are welded while melting the corner formed at the abutting portion between the plate material having a large thickness and the plate material having a small thickness, and pressing the welded plate material. It is a molded product consisting of [0008] According to the manufacturing method of a molded article of the present invention, and the energy of the laser beam irradiated in the thickness of the large plate large Ri by energy of thickness small plate, the plate thickness difference In order to eliminate the relative energy shortage caused by the above, the two plates are sufficiently melted and welded to form a smooth welded part without sharp steps, and the plate thus welded is pressed, so press forming Is solved. Further, by providing a molded product in which the plate material is welded by sufficiently supplying relative energy, it is possible to avoid the problem of a decrease in strength due to stress concentration. FIG . 1 is a perspective view, partially cut away, of a welding apparatus for carrying out a method of manufacturing a molded article according to the present invention. A condenser lens 7 is held by a lens holder 8 at a laser irradiation section of the laser irradiation apparatus. The condenser lens 7 is held by the rotation axis 9 so as to be inclined with respect to the optical axis of the laser light 4. The rotating shaft 9 is aligned with the center of the lens so that the focusing height does not change even if the condenser lens 7 is tilted. Incidentally, when the condenser lens 7 is tilted, the aberration of the lens is actually reduced.
More Although focal position moves planarly, the deviation of the amount of movement from the butt line for a fine small amount is negligible, little question
No title . The thickness difference detecting means 10 is provided outside the lens holder 8.
Is provided. The sheet thickness difference detecting means 10 includes a sheet material 1,
The thickness difference is detected by emitting light to the abutting portion of No. 2. The detection signal of the thickness difference is transmitted to the driving unit 11.
Sent to The driving unit 11 includes a control unit 12 that directly receives the detection signal, and a lens rotation motor 13 that receives and drives the control signal from the control unit 12. Controller 12 receives a detection signal of the thickness difference, the lens rotating motor 1 by the amount nitrous et beforehand stored by the value
Rotate 3 The condenser Les condenser lens 7 by gears 14 and 15 by the rotation of the lens rotating motor 13 is rotated
Lens 7 has a predetermined inclination with respect to the optical axis. This slope is
The energy <br/> formic over the laser beam 4 is irradiated to the thickness of the larger plate 1 and greater Ri by plate thickness small energy of the plate 2 over, the magnitude of both plate members 1 and 2 can be melted equal Is set. That is, the inclination angle of the condenser lens 7 is also increased or decreased according to the difference in plate thickness, and as shown in FIG. 2 , the energy density distribution is set to be suitable for the difference in plate thickness between the two plate materials 1 and 2. ing. Note that the inclination direction of the condenser lens 7 and the
The energy density distribution is naturally correlated, and the rotation axis 9
When the condenser lens is tilted by rotating it counterclockwise as a point
Energy density in the case of turning clockwise and tilting
The distribution is reversed left and right. Similarly, the condenser lens
When tilted in either direction, before and after the focal point
Means that the energy density distribution is left-right reversed. Focus lens
Angle 7 counterclockwise to illuminate the plate material behind the focal position.
When firing, the left side has high energy, so the left side is thick
What is necessary is just to make a board and a thin board on the right side. Next, the case of actually manufacturing according to the method of the present invention will be described. The plate thickness difference detecting means emits light to the abutting portion of the plate materials 1 and 2 to detect a difference in thickness between the two plate materials 1 and 2,
The detection signal is sent to the control unit 12, and the calculated control signal is sent to the lens rotation motor 13. This motor 13
The central lens 7 is tilted by a set angle corresponding to the thickness difference. Energy of the laser beam 4 emitted by the inclination of the condenser lens 7 to a larger plate 1 the plate thickness
Also it increases Ri by energy of thickness small plate 2, abutting portions of both plate members 1 and 2 are equally well melted and welded. FIG. 3 shows a weld 6 welded by the method of the present invention. There is no sharp step 5 ( FIG. 6 ) as in the prior art. Next, the molded product welded so as not to have the sharp step 5 is subjected to press molding. Therefore, the press-formed product does not have the sharp step 5, so that there is no problem of mold seizure. According to the present invention, since the energy of the laser beam irradiated in the thickness of the large sheet to be greater Ri by <br/> energy of thickness small plate The relative energy deficiency due to the difference in plate thickness is eliminated, and the two plate members are melted equally well and welded. Therefore, since there is no sharp step as in the prior art, there is no problem of mold seizure during press forming in post-processing. Further, even if force is applied to the press-formed product, the plate material is welded by supplying a sufficient amount of relative energy, so that there is no problem of strength reduction due to stress concentration.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view of an apparatus for performing a manufacturing method of the present invention. FIG. 2 is an energy density distribution diagram corresponding to a difference in plate thickness. FIG. 3 is a side view showing a welded portion welded by the method of the present invention. FIG. 4 is an energy density distribution diagram when the condenser lens is not tilted. FIG. 5 is a perspective view showing a conventional welding method. FIG. 6 is a side view showing a welded portion welded by a conventional method. [Explanation of Signs] 1, 2 ... Plate material 3 ... Butt line 4 ... Laser beam 7 ... Condensing lens 10 ... Plate thickness difference detecting means 11 ... Driving means

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Kazuo Azuma               1 Toyota Town, Toyota City, Aichi Prefecture               Dosha Co., Ltd.                (56) References JP-A-56-114592 (JP, A)

Claims (1)

(57) [Claims] One surface of two plate materials having different plate thicknesses is butted against each other in a state where they are shifted from each other. the method of manufacturing a molded article, the energy of the laser beam irradiated in the thickness of the large plate made larger than the energy of thickness small plate, the butt of the thickness of the large plate and the plate thickness small plate Manufacturing a molded product, comprising: a welding step of welding the two plate members while melting a corner formed in the portion; and a press step of pressing a plate member welded by the welding step. Method. 2. One surface of two plate materials having different plate thicknesses is shifted from each other, butted together, and the energy of laser light applied to the plate material having a large thickness is made larger than that of the plate material having a small thickness. A molded product formed by welding the two plate materials while melting a corner formed at the abutting portion between a large plate material and a small plate material, and pressing the welded plate material.