JPH0255124B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a point-heat type automatic strain relief device for a thin plate structure, and more specifically, for example, the present invention relates to a spot heating type automatic strain relief device for a thin plate structure.
This invention relates to a device that removes distortions in outer panels that occur due to various factors when assembling roof panels, floor panels, etc. (hereinafter simply referred to as outer panels) by welding.

Conventionally, the strain removal described above has generally been carried out by a so-called moxibustion operation in which the member to be strain-removed, that is, the outer plate, is heated in spots with a gas flame and then cooled with water. In the moxibustion process, local heating is applied to the outer plate where distortion has occurred to cause thermal expansion in the heated area, and at this time,
The heating part is plastically deformed by compressive force due to the restraining force of the non-heating part around the outside, and this phenomenon generates a tensile force against the surroundings after cooling. However, the heating by the gas flame Since the heating area per heating point is relatively large and a large amount of heat is supplied, continuous moxibustion increases the temperature of the outer plate over a wide range, causing thermal expansion of the outer plate itself. Because it curves even more,
The moxibustion point was cooled with water to prevent the temperature of the outer plate from rising. At this time, a relatively large amount of water is applied to the body structure, and some of it penetrates inside the car body structure.
Since it is difficult to completely remove this water, there has been a desire to improve this problem in order to promote the early formation of structural rust. or,
In the above-mentioned moxibustion work, the heating time, heating range, and cooling timing of the outer plate depend on the intuition and skill of the worker, making it difficult to rationalize the strain relief work.

The present invention was developed in view of the above points, and it is easier to control ignition and extinguishment and control of heat input compared to gas flames, which not only facilitates automation but also unnecessarily expands the range of heating points. By heating without heating, it is possible to increase the speed of strain relief work by reducing the heating time, and by performing high-density spot heating, the temperature gradient between the heated area and the surrounding area becomes large, which increases the heating time. It is possible to prevent temperature rise over a wide range of areas and achieve a highly efficient and automatic strain relief effect, and it is also possible to prevent the induction of rust on structures and improve the working environment. The object of the present invention is to provide a strain relief device that does the following.

The spot heating type automatic strain relief device according to the present invention has a length that spans adjacent bone members among the bone members to which the outer skin of a structure or the like is attached, and the projections of the outer skin are pressed and the recesses are brought into close contact with each other by suction. A parallel suction press pad is provided so as to be able to abut against the outer plate, the surface surrounded by the bone member of the outer plate and the suction press pad is made flat, and a large number of suction press pads are provided between these suction press pads. It is equipped with several point-heating torches arranged in a row, and these torches are operated one after another with a slight time difference.

Next, an embodiment of the strain relief device according to the present invention will be described with reference to the drawings. In FIG. It is installed accordingly.

Now, the strain relief device 1 according to the present invention includes a pressing cylinder 2 that is appropriately attached to a support frame S (details not shown) that supports the strain relief device, and a pressing cylinder 2 that is pivotally attached to the tip of the pressing cylinder 2 via a pin 3. pressed frame 4
, suction press pads 5, 5 arranged parallel to this press frame 4, and suction press pads 5,
It consists of a plurality of torches 6 to 6 installed in series between the torches 5 and 5.

The pressing frame 4 is formed into a grooved net shape, and is pivotally connected to the tip of the pressing cylinder 2 via a pin 3 at the center of the outer surface of the web, and the tips of both the upper and lower teeth shown in FIG. Suction pressure pads 5, 5 are attached to the parts.

Next, an example of the structure of the suction pressure pad 5 is shown in the third example.
To explain in detail with reference to Figures 5 to 5, reference numeral 7 is a seat plate for pressing the outer panel B. For example, a steel plate or the like is formed into a substantially oval shape, and an O-shaped part is formed in the center of the seat plate. It has a built-in cooling water channel 8. A cooling water inlet 9 is connected to one end of the cooling water channel 8 (the right end in FIGS. 3 and 4), and a cooling water outlet 10 is connected to the other end, so that the cooling water flows through the cooling water channel 8. The seat plate 7 is configured to be cooled by circulation.

Further, on the bottom surface of the seat plate 7, suction grooves 11 having a triangular cross section for vacuum suction are recessed along the longitudinal center line of the seat plate 7, and a plurality of suction grooves 11 having the same cross section as the suction grooves 11 are recessed. (The figure exemplifies the case of four suction grooves.) Suction grooves 12 to 12 are recessed in orthogonal communication with the suction groove 11, and the suction groove 11 has a vacuum suction port 13 at a portion to the right of the center. It is connected.

In the figure, 14 is a rubber bellows that covers the upper surface and outer circumferential surface of the vehicle body structure 7, and 15 is a bellows presser that further presses the upper surface and outer circumferential edge of the bellows 14.

Now, between the suction press pads 5, 5 configured as described above, a plurality of torches 6 to 6 (6 torches are illustrated in FIG. 1) are arranged in series. It is installed.

Next, one embodiment of each torch 6 will be described in detail with reference to FIG. 6. The torch 6 is a Teigu arc torch, whose electrode rod 16 is used as a cathode, and whose nozzle 17 made of a metal conductor is used as a cathode. A flow path 18 is provided inside the torch for injecting a working gas such as an inert gas in the direction of arrow Q to the Teig arc generated between the electrode rod 16 and the nozzle 17 as an anode. A cylindrical nozzle tip 19 that reaches the surface of the outer plate B as a member is connected to the nozzle 17.
The nozzle is electrically insulated and fitted onto the tip of the nozzle, and compared to conventional strain relief using a gas flame, the control of ignition and extinguishment and the amount of heat input are easier and automated. Not only is it easy to use, but the heating time is short, making it possible to speed up the strain relief work.Moreover, it is possible to converge the arc toward the center as shown in Figure 6, A, and it fits onto the tip of the nozzle. The cylindrical nozzle tip 19 actively prevents the heat generated by the arc A from dissipating, thereby enabling high-density spot heating and increasing the temperature gradient between the heating section and its surroundings. Therefore, outer plate B
The moxibustion effect can be achieved in a highly efficient manner by preventing temperature rise over a wide range of temperatures.

Note that in the torch 6 shown in FIG.
The durability of the torch 6 can be increased because of the configuration in which the inner peripheral surface of the nozzle 17 is cooled by circulating cooling water through a cooling water supply port 20 provided on the side surface of the tip end of the torch.

Now, a plurality of torches 6 configured as described above
6 are attached to the inside of the press frame 4 via buffer springs 21, as shown in FIG. 2, and are configured to operate sequentially from one end with a slight time difference.

Now, when strain relief is performed by the strain relief device 1 configured as in the above embodiment, as shown in FIG.
The apparatus support frame S is positioned so that the torches 6 to 6 face the outer plate to be strained.

Next, the press cylinder 2 is activated and the press frame 4 is
towards the outer plate B and suction pressing pad 5,
5 is brought into pressure contact with the outer plate B, the convex portion of the outer plate B is pressed, and the air in the suction grooves 11 and 12 recessed in the bottom of the seat plate 7 is further diluted through the vacuum suction port 13. As a result, the concave portion of the outer plate B is suction-adhered, and the strain-removed outer plate portion surrounded by the bone members P, P and the suction pressing pads 5, 5 appears as if it were firmly attached to the rectangular frame. state and is held in a so-called flat state.

Next, when voltage is applied sequentially to the plurality of torches 6 to 6 with a slight time difference, each torch 6 to
Only the portion facing 6 is heated locally and for a short time to remove the strain. At this time, not only is the above-mentioned heating a point heating with a time difference, but also the outer panel is cooled through the seat plate of the suction and pressure pad, which prevents a wide range of thermal effects on the outer panel. Distortion can be removed extremely efficiently.

As explained above, the device of the present invention is capable of highly efficient and automatic strain relief by sequentially point-heating only the portion facing each torch while holding the outer plate between adjacent bone members in a flat state. It can be performed.
Moreover, in the device of the present invention, since the nozzle tip 19 actively prevents the dissipation of the heat generated by the arc A, there is no need to forcibly cool the heating section, and there is no longer a need to cool the outer plate with water. This has the effect of preventing the occurrence of rust on the structure to be strained and improving the working environment compared to the conventional method.

In addition, in the above-mentioned embodiment, the technique of arranging two suction pressing pads 5, 5 in parallel was illustrated, but the present invention is not limited to this, and three or more suction pressing pads are arranged in parallel, and each suction pressing pad is arranged in parallel. It is also possible to arrange and install a plurality of torches between the suction and pressure pads, and in this case, strain can be removed over a wide range of areas at the same time.

Next, examples of support frames when the strain relief device according to the present invention is used for strain relief in a vehicle body structure are shown in FIGS. 7 to 9.
To explain with reference to the drawings, in FIG. 7, D indicates a side window opening of the vehicle, and B indicates an outer panel attached to the outer surface of the vehicle body excluding the side window opening.

Now, in the embodiment shown in FIGS. 7 and 8, the support frame SA, which is erected on the floor surface of the truck W that is movable along the outer panel of the strain relief structure, is A set of strain relief devices IA, IB, and IC are each mounted so that their mounting positions can be adjusted by a slight amount in the vertical and horizontal directions. However, the strain relief device IA is installed above the side window, that is, at the height of the so-called curtain plate, and the IC is installed below the side window, that is, at the height of the wainscot. The same IB
is formed so that spot heating can be performed sequentially along the vertical direction between the side windows D, D, that is, in the so-called blowing part.

In addition, in FIG. 9, it is formed so that the cart W can be moved while guiding the support frame SB by a guide G attached to the building frame F.

Note that the outer panel of a vehicle generally has a curvature in the vertical direction in many cases. In this case, if an attempt is made to set the suction pressure pad in the vertical direction, one must be prepared that matches the curvature of the vehicle.

However, since the device of the present invention performs spot heating, even if the vehicle outer panel has a curvature in the vertical direction, the suction and pressure pads can be used in the lateral direction, so it can be flat. Therefore, it can be said that the device of the present invention has a wide range of uses and is extremely effective as a strain relief device for vehicle outer panels.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the strain relief device according to the present invention, FIG. 1 is a front view illustrating the state in which the strain relief device is attached facing the outer panel, and FIG. 3 is a partially broken bottom view of the suction pressure pad, FIG. 4 is a front view of the same sectional view, FIG. 5 is a sectional view taken along the - line in FIG. 7 is a front view of an embodiment of the strain relief device according to the present invention used for strain relief in a vehicle body structure, FIG. 8 is a side view thereof, and FIG. 9 is a side view of FIG. 8. FIG. 7 is a side view showing another embodiment. 1... Strain relief device, 2... Pressing cylinder, 5...
Suction pressure pad, 6...Torch, B...Outer plate, P
...Bone member for attaching the outer panel.

Claims (1)

[Scope of Claims] 1. A strain relief device for removing strain from an outer panel attached to an adjacent bone member of a vehicle body structure, comprising at least two suction and pressing pads capable of vacuum suctioning the outer panel. A plurality of point heating torches are disposed between the suction and pressing pads and are oriented to radiate heat toward the outer plate and can be operated sequentially at a predetermined time difference; The suction and pressure pad has a seat plate with a length spanning between the bone members, and the bottom surface of this seat plate has suction grooves recessed in the outer plate to enable pressure vacuum suction, and cooling water is provided inside. A spot heat type automatic strain relief device, which is configured to form a cooling waterway to enable circulation of water, and to be capable of adsorbing and cooling outer plates on both sides of the plurality of spot heat type torches.