JPS62279091A - Joining method for work - Google Patents

Abstract

PURPOSE:To join both flange parts which are held in tight contact with each other to a good finish with a simple device even if a welding allowance is small by radiating heat rays from a processing head set in and at a prescribed position and angle of inclination to the irradiation surface formed to a prescribed shape at the time of joining said flange parts by the high-density heat rays. CONSTITUTION:The former of the flange parts 1a, 2a of plates 1, 2 is formed to the length slightly longer than the length of the latter and the latter is pressed to the inner side face 10 of the former in processing of, for example, a ferrule filler lid F. The L-shaped irradiation surface 12 is formed of the side face 10 and the end face 11 of the flange part 2a. The processing head R of a laser gun, etc., is set above said flange part apart at the prescribed distance S therefrom so as to have the prescribed angle theta of inclination. The highdensity heat rays are radiated from the head R to the surface 12 to melt the flange part 1a or 2a. The molten metal is penetrated into the spacing between the two flange parts along the contact surface 13 and is solidified by which the two flange parts are joined.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Object of the Invention] (Field of Industrial Application) The present invention is directed to the welding of small and medium flange portions of plates using high-density heat rays such as laser beams. Regarding the joining method.

(Prior Art) For example, among the press-molded parts for automobiles, there is a fuel filler lid that covers and protects the fuel tank cap portion of the automobile from the outside, and this automobile part is shown in Fig. 3.4. As shown, a hinge plate 2 made of the same metal is fixed to a metal main body plate 1 having a flat U-shaped cross section, and is rotatably attached to a body 4 via a hinge member 3. . This fuel filler lid is provided with a key assembly (not shown) in the through hole 5 of the main body plate 1, and is opened and closed by inserting the key into this key assembly. This prevents it from being opened or closed.

In order to attach the hinge plate 2 to the main body plate 1, as shown in FIG. This is done by fitting the part 2a between the flange parts 18 and performing spot welding, arc welding, etc. with both the flange parts 1a and 2a attached.

(Problems to be Solved by the Invention) However, when welding the spora 1 to Therefore, it is difficult to clamp the flange portion with the ordinary spot guns 8, 8, and there is a certain limit to spot welding a plate having a flange portion of this small size. Also, after this spot welding, some of the flesh of the flange parts 1a and 2a swells,
So-called burrs 9 may occur. Bali 9 like this
When painting is applied to the fuel filler lid F having a burr, the paint film covering the burr 9 becomes thin and peels off
There is also the problem that corrosion is likely to occur later.

Such a problem occurs when the flange portion 1a, which is the welding allowance,
If 2a is made larger, problems such as the generation of burrs 9 will be eliminated, but if flatness is required, changes in dimensions are not allowed, and the emergence of other alternative methods is eagerly awaited.

Both flange parts 1a are used instead of this spot welding.

A method of performing arc welding or TIG welding between 28 is also considered, but such welding has a large thermal effect and may cause distortion in the flange portions 1a, 2a or the plate 1.2.

Therefore, if welding is performed using high-density heat rays such as laser beams, which have recently been attracting attention, welding can be performed relatively easily without the above-mentioned adverse thermal effects.

However, this method has the disadvantage that so-called dieting is difficult and work efficiency is reduced.

In other words, in laser processing, the distance that the light beam emitted from the processing head reaches the workpiece or the angle between the processing head and the workpiece are extremely important. or cause welding defects.

In particular, when welding workpieces one after another while flowing a line, if the distance (height) from the processing head to the workpieces varies from workpiece to workpiece, the distance can be measured by a hide sensor for each workpiece. It is necessary to irradiate a laser beam or the like from the processing head while making measurements. In this case, the height of the machining head can be controlled relatively easily using the hide sensor, but setting the angle between the machining head and the workpiece requires a complicated device, and its control is also troublesome. .

The present invention has been made focusing on the above-mentioned problems.
When joining plates with a small welding allowance to form a workpiece, it is now possible to quickly perform joining with a good finish without causing thermal distortion or burrs due to raised flesh using a relatively simple device. The purpose is to provide a method for joining workpieces.

(Means for Solving the Problems) In order to achieve the above object, the method of the present invention involves closely contacting the flange formed on one plate with the flange formed on the other plate, and In the workpiece joining method in which the two plates are joined by radiating high-density heat rays from the processing head, the processing head is spaced a predetermined distance from both the flanges and has a predetermined inclination angle. set, one end of the two flanges is formed to be slightly longer than the other, and the irradiation surface formed by the side surface of the long flange and the end surface of the short flange is subjected to the processing. The apparatus is characterized in that a high temperature heat ray is emitted from the head, and the molten metal melts between the two flange parts along the abutment surface and joins the two flange parts.

(Function) In the method of the present invention configured as described above, the processing head is set at a predetermined height position and at a predetermined inclination angle with respect to the plate set on the clamp member, and the plate is attached to both flange portions. Since the irradiation surface is formed at the end of the flange, even if the high-density heat ray is irradiated from the processing head, the high-density heat ray will not protrude from the workpiece, and the irradiation surface will not be exposed near the contact surface of both flanges. It emits high-density heat rays.

When a part of the flange part melts due to this radiation, the molten metal does not escape through the long flange part, but melts between the abutting surfaces of both flange parts, and heats both plates reliably and easily. It can be joined without any distortion.

(Example) Hereinafter, embodiments of the method of the present invention will be described with reference to the drawings.

FIG. 1 (A>) is a cross-sectional explanatory diagram showing one embodiment of the method of the present invention, showing the processing state of a fuel filler lid, and the same members as those shown in FIGS. is attached.

The illustrated fuel filler lid F has a flat cross section.
It has a main body plate 1 which is press-molded into a letter shape, and a hinge plate 2 which is press-molded similarly to this main body plate 1.

Both plates 1.2 are clamp members CI.

It is held by C2, and on the outer periphery of this main body plate 1,
A long flange portion 1a is formed at both ends of the hinge plate 2, and short flange portions 2a are formed at both ends of the hinge plate 2.
a is fitted between the long flange portions 18.

In this embodiment, the long flange portion 1a refers to a portion that projects upwardly longer than the similar flange portion 2a.

Further, the reason why the main body plate 1 side is formed into a long flange portion 1a and the hinge plate 2 side is formed into a short flange portion 2a is to ensure reliability and ease of welding work, which will be described in detail later.

These flange parts 1a, 2a are as shown in FIG. A processing head R consisting of a hide sensor I-1s and a laser gun etc. provided in close proximity to the hide sensor I-1s is installed above both flange parts 1a and 2a, and this hide sensor)-1s is a clamp member. The distance S to CI is measured, and the height of the processing head R is set accordingly.

However, the inclination angle θ of this processing head R with respect to the clamp member C1 is fixed to a predetermined value.

In this way, the inclination angle θ of the processing head R consisting of a laser gun, etc. is set to be approximately 5 to 15 degrees with respect to the contact surface 13 of both plates or its extension line, and the hate sensor H8 is used to ensure that the angle of inclination is approximately 5 to 15 degrees. Depending on the size of the target to be irradiated, if the target is controlled to be irradiated, erroneous irradiation will not occur and the light of the entire beam can be used effectively.

Note that this inclination angle θ is approximately half of the convergence angle α of the light beam emitted from the laser gun R. In this way, this laser beam can be applied to both flanges 1a, which are the irradiation targets.
, 2a, the laser beam can be used effectively.

In particular, the part that is hit by this laser beam is the long flange part 1a.
Since the irradiation surface 12 is formed by the long flange portion 1a and the short flange portion 2a, the laser beam hits either or both of the long and short flange portions 1a and 2a and melts them. 1a surrounds the molten metal from the outer periphery like a so-called bank, so the molten metal does not escape and reliably melts between the contact surfaces 13 of both the flange parts la and 2a, where it solidifies. Both flanges 1a and 2a are firmly joined.

In addition, welding work becomes extremely easy. This welding is different from the aforementioned spot welding in which the flange portions 1.2 are held between the spot guns, and the flange portions 1a and 2a are welded without contact, so the welding work is easy and easy. becomes easier. In addition, even if the welding allowance is made extremely small, welding can be performed without any problems.
Since there is no need to consider the welding allowance to prevent the above-mentioned burr 9 from occurring, a flatter fuel filler lid F can be easily obtained.

Furthermore, the fact that the height of the flange parts 1a, 2a is small means that there is less influence of springback when the flange parts 1a, 2a are formed by press, and this means that each plate 1, The accuracy of No. 2 will be improved, and the accuracy of the product will also be significantly improved.

For example, when the height of both flange parts 1a and 2a is 11, and the wall thickness of this work is t, if the height H is less than 10, the influence of springback after molding will be extremely small, and the accuracy will be significantly reduced. It will improve. Therefore, when performing mass production, if welding is performed by emitting the laser beam, the set position of the workpiece will be fixed, and erroneous irradiation due to misalignment etc. can be prevented as much as possible, and products with excellent precision can be produced. You will be able to get it. Furthermore, as a matter of course, the small height of the flange portion means that the material cost is small and the size is small, which is advantageous in terms of cost.

In addition, since the above-mentioned embodiment is a fuel filler lid, the flange portion 1a,
2a is installed almost upright, but when making other automobile parts, such as front pillars, center pillars, etc., with horizontal flange parts 14a and 15a, as shown in FIG. Welding is performed by emitting a laser beam to the L-shaped irradiation surface 12 near the contact surface 13 of the flange portions 14a and 15a. In this case as well, simple and reliable bonding can be achieved as in the case described above.

In this embodiment, the length of the flange portion means the length of the outward projection.

Furthermore, the light beam used for welding is not limited to the laser beam as in the above-described embodiments, but may also be a high-density heat ray such as an electron beam or plasma having similar energy.

[Effects of the Invention] As described above, according to the present invention, an irradiation surface of a predetermined shape is formed by the work to be welded, and a processing head is set at a predetermined position and at a predetermined inclination angle toward the irradiation surface. Since it emits high-density heat rays from the
This molten metal is made to melt between the two workpieces without escaping, making it possible to weld easily and with a good finish even on workpieces with a small welding allowance.There is no erroneous irradiation, and the irradiation is performed reliably without the use of complicated equipment. Distortion-free welding can be performed.

[Brief explanation of the drawing]

FIG. 1(A) is a cross-sectional schematic explanatory diagram showing the processing state of a fuel filler lid by the method of the present invention, and FIG. 1(B)
is an enlarged cross-sectional view of the main part of FIG. 1(A), FIG. 2 is a cross-sectional schematic diagram showing the processing state of the front pillar etc. by the method of the present invention, and FIG. 3 is a perspective view showing the usage state of the fuel filler lid. FIG. 4 is a perspective view of a fuel filler lid, and FIG. 5 is a perspective view of a main part showing an example of a conventional fuel filler lid forming method. 1.2... Plate, 1a, 2a... Flange part,
12... Rectangular irradiation part, 13... Contact surface, R... Machining radius, S... Distance between the processing head and the clamp member, θ... Inclination angle of the processing head.

Claims (1)

[Claims] A flange part (1a) formed on one plate (1) and a flange part (2a) formed on the other plate (2)
In the workpiece joining method, the workpieces are joined by closely contacting the two plates and radiating high-density heat rays from the processing head (R) to both the flanges (1a) and (2a), the processing head (R) Both flanges (1a)
(2a) so that it is spaced apart by a predetermined distance (S) and has a predetermined inclination angle (θ), and one end of the two flanges (1a) and (2a) is slightly longer than the other. The machining head (
R) to radiate higher density heat rays, and this molten metal flows along the contact surface (13) to both the flange portions (1a) (
2a) Both the flange portions (1a) (2a)
A method of joining workpieces by joining.