JPS5935877A - Joining method of outside plate of vehicle and brazing torch holder - Google Patents

Abstract

PURPOSE:To obtain the surface of a brazed joint with less thermal strain and to enable automation, by coating a heat absorbing and dissipating material on the outside plate panel at the circumferential edge of a brazed part and providing a press roll to a torch holder. CONSTITUTION:A heat absorbing and dissipating material P is beforehand coated on the front and rear surfaces of the outside plate panel at the circumferential edge in a brazed part prior to brazing. A bracket 14 is acted by the respective compression coil springs S provided on parallel bars 13 so as to press the body Ha of a torch holder H toward the outside on the opposite side of a mounting plate 11 so that press rolls R press both side edges of a joggle type joint part J to prevent said edges from floating. Bead brazing is progressed while preventing the floating of the panel by the heat input of brazing by pressing both side edges of the brazed part of the joint from both sides with the brazing rod 5 of a torch T as a center.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a joining method for preventing the occurrence of thermal strain in joggle-shaped joints of adjacent outer panels of automatic tonnage bodies, especially roofs and rear fenders, and brazing that can be directly used in the method. The present invention relates to a torch holder device.

BACKGROUND OF THE INVENTION As a conventional brazing brazing method for roof and rear fender panels, there is a method shown in FIGS. 1 and 2, for example. The outer panels of the roof and rear quarter sections of automobile bodies are usually extremely thin, with a thickness of 0.7 to 0.81 mm, and brazing soldering of joggle joints is prone to thermal distortion. In order to prevent heat distortion in the solder joint, a water-cooled clamp jig is used to securely hold the panel at the joint, and to locally stop the heat input from the solder joint. 1 is an automobile body, 2 is a roof spring roof, 3 is a front panel having a rear quarter section 3a, and J is a jongle-shaped brazing brazing joint of both panels 2 and 3. A hand-held blazing torch with 4 torches,
Reference numeral 5 denotes the soldered portion, and the torch 4 is connected to an MIG (metal inert gas) brazing welding machine (not shown) or the like. b is a water-cooled clamp jig for holding the panel in place.

Figure 2 is an enlarged Igi side view of this joint part J, and the water-cooled clamp fern 6 has a high thermal conductivity.
etc., and the tightening not shown in the figure is done by the device inside the joint part 1.
The lIII edge is firmly clamped. 1 is a cold shoulder water circulation passage provided inside this clamp member, and cooling water is supplied from the outside by two flexible hoses (not shown).
It is ringed n. 1 on Ushida 8, reinforcing quarter panel inca spot welded on the back side of rear fender panel 3, 9
is a working hole.

However, such conventional water-cooled clamp jigs need to be attached to and removed from the car body during post-brazing brazing work, and in a production line where multiple car models are mixedly produced, multiple water-cooled cranks for different car models are used. The jig must be attached and detached each time, and this work is difficult to mechanize and must be done manually. Therefore, in the above-mentioned mixed flow production line, the attachment and detachment of this clamp jig becomes a bottleneck, and it is difficult to automate the work after brazing and soldering.
It was extremely difficult to convert to J-pot.

This invention has been made with attention to such problems, and it is a method to locally limit the heat of the solder at the soldered part of the joint.
In advance, apply a heat absorbing/dispersing agent to prevent thermal distortion on the front and back surfaces of the outer panel around the edges of the solder joint2, and apply a heat absorbing/dissipating agent to the brazing torch holder to prevent the panel from deforming and floating due to the heat of the solder. 11 - By providing a roller and brazing the inner and outer panels without pressing them, we can improve the surface bending of the soldered joint with less thermal distortion, and also make it possible to attach the brazing torch boulder to the arm of an industrial robot (NJ Kei). hand,
The present invention attempts to solve the above problems by making it possible to automate post-brazing brazing work.

Hereinafter, this invention will be explained based on the drawings.

FIGS. 3 to 6 are diagrams showing an embodiment of the present invention. Note that the same configuration as the conventional example is indicated by the same reference numeral, and redundant explanation will be omitted. First, to explain the configuration, J indicates this jongle-shaped joint, H is the brazing torch holder, A is the arm of an industrial robot for arc welding with 5 axes of joints, and T is the brazing torch held by the torch holder H. This torch T is connected via a supply pipe 10 by MIG brazing welding (not shown). The brazing torch holder H is mounted on the wrist part of the arm A of the industrial robot via a bolt inserted into a hole 12 on a plate 11 so as to be rotatable around the axis of the arm A. Please inquire.

In addition, the above-mentioned brazing torch T is pawned with a pair of parallel rods 13 fixed to the main shaft Ha of the torch holder H, and is fixed to a brazing rod (4) which can slide on it. The suppression roller R is arranged to be freely rotatable. These rollers R are made of a material such as heat-resistant and flame-retardant hard rubber. The bracket 14 is attached to the main body 1a (/C%J) of the torch holder 11 by each compressed fill spring S provided on the parallel bar 5-13.
The pressing roller R is configured to press the opposite side outward so as to press both side edges of the diagonal joint J so as not to float up. Further, P is a paste-like heat absorbing/dissipating agent applied to the respective surfaces and coplanar surfaces of the outer panel around the periphery of the soldered portion. N indicates a solder bead.

Next, this joining process will be explained.

The retatorch holder (I) attached to the wrist of the arm A of the welding robot can freely approach the soldered joint J' by this robot. For soldering, bead soldering is performed by pressing the edges of the joint's soldering part from both sides centering on the soldering part 5 of the torch T to prevent the panel from floating due to the soldering heat input. .

Furthermore, in order to locally stop the transfer of heat input to the soldering and to minimize the occurrence of thermal strain, the above-mentioned heat absorbing/dispersing agent P is added to the front and back surfaces of the outer panel around the periphery of the soldering. Apply in advance. This heat absorbing/dissipating agent, an organic and inorganic substance with high heat insulation properties whose main component is silicon dioxide (8i0z), is applied to the area to be insulated using a paste-like agent kneaded with a special i1i. Since it has the effect of rapidly absorbing and dissipating internal temperature, it does not accumulate heat from the solder and prevents it from being transmitted from the application area to the surrounding area, minimizing thermal deformation. I can do it. This application range is 40 to 5011J wide.
A thickness of about 2 to 4 inches is appropriate, and when applied with a brush, as shown in Figure 6, the soldering heat is prevented from diffusing outside the B range, and thermal deformation is prevented from spreading over a wide range. I can escape. Figure 7 shows this heat absorption and contrast with Figure 6.
An example of the deformation tendency when the divergent agent P is not used is shown. Incidentally, this type of heat absorbing/dissipating agent P is commercially available as a heat insulating agent or a welding treatment agent, and an example of a domestically produced product is the product name ``Cool Mituto'' sold by Fuji Kiko Co., Ltd. Please note that these products are water-soluble and harmless to the human body.
Also, it does not cause oxidation or generation of toxic gas due to high heat.

As described above, according to the present invention, a jiggle-shaped joint is formed by the edges of adjacent exterior panels constituting an automobile body, and the joint solder ITh 141 to the peripheral exterior panel A heat absorbing/dissipating agent (heat-strain prevention material) is applied to the front surface, and both edges of the joint are pressed by a pair of pressing rollers provided on the brazing torch holder, while being soldered with a brazing torch. As a result, a flat welding surface with less thermal distortion can be obtained, and the water-cooled clamp jig for holding the panel, which was conventionally attached to the manual soldering layer, is uncomfortable, so automatic soldering work using a solution phase robot is possible. A remarkable effect can be obtained.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main parts showing a conventional brazing brazing method for jongle joints on roof and rear fender panels, Fig. 2 is an enlarged cross-sectional view of the fitting portion of the joint in Fig. 1, and Figs. 6 is a diagram showing a brazing brazing method for jongle joints for roof and rear fender panels according to the present invention, FIG. 3 is a perspective view of the main parts, FIG. 4 is a perspective view of a brazing torch holder, and FIG. Figure 5 is an enlarged 11j I side view of the main part of the soldered joint, Figure 6 is an enlarged sectional view of the soldered joint, and Figure 7 shows the heat of the soldered joint when no heat absorbing/dissipating agent is used. It is a figure showing an example of a deformation tendency. 1... Automobile body 20. ,, ,, Relief panel 3... Rear fender panel 5...
...Brazing part 11...Plate 13...Parallel bar 14...Bracket A...Robot arm H...・・・・・・Blazing torch holder Ha・
...Torch holder body J...Jongle joint J'...
・・・・・・Fitting brazing part N・・・・・・Brazing bead P・・・・・・Heat absorption/dispersion agent 1? ,... Press roller = 9- 8... Pressing coil spring T... Blazing torch 10- Fig. 7 2

Claims (2)

[Claims] (1) A jongle joint is formed by the edges of adjacent outer panels that make up the car body, and heat absorbing material is applied to the front and back surfaces of the outer panels around the soldered joint to prevent thermal distortion.・Apply a divergent agent, then press both edges of the joint with a pair of pressure rollers arranged on both sides of the brazing torch holder with the brazing torch in the center, move the brazing torch holder, and press the joint. A method for joining vehicle body outer panels characterized by soldering the soldered parts. (2) A bracket with a pair of suppression rollers arranged on both sides of the brazing torch is slidably attached to the torch holder body; A brazing torch holder assembly fR0 for joining an outer panel of a car body, characterized in that both edges of a diagonal joint formed by the edges of an outer panel are pressed by springs.