JPH0957368A - Press hemming machine having heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrate a heating device to thermo-set the sealer adhesive applied between flanges at the hemming position with a press hemming machine. SOLUTION: A press hemming machine is provided with a preliminary bending blade to make a preliminary bending to fold back a flange part 3a in the condition in which a flange part 4a of an inner panel 4 is overlapped on the flange part 3a of an outer panel 3 loaded on a lower die 2, and a permanent bending blade 7 to make a permanent bending to hold the flange part 4a of the inner panel 4 with the flange part 3a of the outer panel 3 by lowering the flange parts 3a, 4a to the overlapped hemming position after the preliminary bending. A heating body 23 to heat the flange parts 3a, 4a is fitted to a tip part of a cylinder rod 22 of a cylinder 20, and the heating body 23 is advanced from the waiting position to the hemming position through the route which is not interfered with the permanent bending blade 7 and the preliminary bending blade 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a flange portion after a flange portion of one outer panel of two work panels is folded back by a press and a flange portion of the other inner panel is sandwiched by a press after a hemming process. The present invention relates to a press hemming machine with a heating device provided with a heating body that heat-cures a sealer adhesive having an anticorrosive action.

[0002]

2. Description of the Related Art In a hemming process in which a flange portion of an outer door panel of an automobile is folded back and a flange portion of an inner panel is sandwiched, a sealer adhesive applied between the flange portions is not followed by spot welding after this step. Temporary curing is performed by heating. As a result, the flange portion is restrained, and finally it is thermally cured in the coating process in the coating furnace.

[0003]

SUMMARY OF THE INVENTION In view of the fact that such temporary heat curing treatment is carried out by an independent heating device by moving the temporary heat curing treatment to one of the two panel works, To provide a press hemming machine with a heating device integrated with a heating device for thermosetting the sealer adhesive applied between the flanges at the hemming position after the hemming process of sandwiching the flange part of the other flange part by folding back the other flange part. With the goal.

[0004]

In order to achieve this object, the present invention provides an outer panel according to claim 1, in which the flange portion of the inner panel is placed on the flange portion of the outer panel placed on the lower mold. The pre-bending blade that folds the flange part of is bent, and after the pre-bending, the flange part of the outer panel sandwiches the flange part of the inner panel to perform the main bending by descending to the hemming position where both flange parts overlap. In a press hemming machine equipped with a main bending blade, a heating body for heating the flange is attached to the tip of the cylinder rod, and the heating body is passed from a standby position through a path that does not interfere with the main bending blade and the preliminary bending blade. It is characterized by including a cylinder for advancing to a hemming position.

After the hemming process, the cylinder advances the heating element to the hemming position from the standby position for a predetermined time through a path which does not interfere with the original position of the main bending blade and the pre-bending blade or a specific position to avoid the interference. The sealer adhesive is heat-cured by heating the flange portion with a heating body while being in contact with or substantially in contact with the hemmed flange portion.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A press hemming machine with a heating device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
Reference numeral 5 denotes an upper base fixed to a ram 8a which is vertically moved by a cylinder 8 mounted on the body frame 6. A main bending blade 7 is installed under the upper base via a frame 7a, and a preliminary bending device 10 is installed on the lower base 1 on which the lower mold 2 is placed.

This pre-bending device has a guide rail 11 laid on the lower die 2 toward the hemming position, and is guided by this guide rail and is biased by a spring (not shown) in the direction opposite to the hemming position. And a pre-bending blade 13 that is pivotally attached to this base by a support shaft 14a
The holder 14 provided with the following, the driven roller 15 pivotally supported at the rear end thereof, and the pre-bending blade 13 pivoted downward from the horizontal position by being pivotally mounted between the base end portion of the holder 14 and the base portion 12. And a solenoid 17. The driven roller 15 is driven by the driving body 16 provided on the upper base 5 via the frame 5a, so that the pre-bending blade 1
3 is advanced to the hemming position.
That is, when the driving body 16 descends, the driven roller 15 is gradually driven by the lower inclined surface 16a to move forward, temporarily stops at the forward position on the intermediate flat surface 16b, and gradually moves on the upper inclined surface 16c. fall back.

According to the present invention, the cylinder 20 is obliquely provided on the upper base 5 by the frame 21, and the heating body 23 is attached to the tip of the cylinder rod 22. This heating element is advanced and retracted between the hemming position shown by the solid line and the standby position shown by the dotted line, and its path is set so as not to interfere with the main bending blade 7 and the preliminary bending blade 13 in the original position. As shown in FIG. 2, for example, in the heating body 23, a heating wire 23b whose periphery is electrically insulated is embedded in a case 23a whose bottom surface is formed of a metal material corresponding to the shape of the inner panel 4 (see FIG. A) or a U-shaped pipe 23c that circulates hot air is housed (B in the figure). A plurality of such heating devices are arranged along the flange portion as needed.

The operation of the press hemming machine with a heating device constructed as described above is as follows. The outer panel 3 having the flange portion 3a preliminarily bent in the orthogonal direction is carried into the hemming position of the lower die 2, and the inner panel 4 having the flange portion 4a is stacked thereon. During the hemming process, the heating element 23 is retracted to the dotted line position. In the process of lowering the upper base 5, the lower inclined surface 16 of the driving body 16
a pushes the driven roller 15 downward to advance the preliminary bending blade 13 to the hemming position, and when the flat surface 16b drives, the preliminary bending blade 13 is temporarily stopped and the solenoid 17 swings the preliminary bending blade 13 slightly downward. Preliminary bending is performed to bend the portion of the flange portion 3a that has been bent in the vertical direction inward. Further, in the process of descending, the main bending blade 7 descends in conjunction with the fact that the main bending blade 7 is driven by the upper inclined surface 16c and is gradually retracted by the spring force to perform the main bending process.

Then, the upper base 5 is lifted to complete the hemming process. In response to the end signal of the hemming process, the cylinder 20 is driven forward for a predetermined time, the heating body 23 is folded back, and the flange portion 3 with the flange portion 4a sandwiched therebetween
The sealer adhesive material applied to the outer panel 3 in the previous step of the hemming process is heat-cured. Then, the sealant adhesive is returned to the position of the dotted line, and the temporary heat curing step of the sealer adhesive is completed.

The present invention can be similarly applied to the case where the pre-bending device is not driven by the driving body 16 provided on the upper base 5 but has an actuator independently.

FIG. 3 shows an embodiment in which the present invention is applied to a hemming machine according to Japanese Utility Model Laid-Open No. 60-56123. A main bending blade 7 is attached to the lower base 1 via a frame 7a so as to face the hemming processing position of the lower die 2, and this blade is moved so as to advance the preliminary bending blade 13 to this hemming processing position. A bracket 33, which supports the holding frame 31 on both sides by a shaft 32, is provided below. A rod 34 is erected on the upper end of the frame 31,
The tip is a pre-bending blade 13 attached to the upper base 5.
Is pivotally attached to a cylinder rod 36 of a cylinder 35 as a rotation actuator. As the cylinder rod advances and retracts, the preliminary bending blade 13 rotates between a hemming position and an escape position (FIG. 4) that does not interfere with the main bending process by the main bending blade 7.

According to the present invention, the cylinder 20 is obliquely provided on the frame 7a by the frame 21, and the heating body 23 is attached to the tip of the cylinder rod 22 thereof. The path of this heating element is set so as not to interfere with the main bending blade 7 in the original position and the preliminary bending blade 13 rotated to the above-mentioned escape position.

When the ram 8a descends, hemming starts. First, the pre-bending blade 13 pre-bends the outer panel 3, and after that, the ram 8a once rises and the pre-bending blade 13 rotates to the escape position. The ram 8a descends again to perform the main bending. Then, in a slightly raised state, the heating element 23 advances from the position shown in FIG. 3 to the position shown in FIG. 4 and comes into contact with the flange portion 3a. After the heat curing step is finished, the temperature is further raised and the preliminary bending blade 13 is also returned to the original position.

[0015]

As described above, according to the present invention, a heating device composed of a heating body for thermosetting an adhesive and a cylinder is incorporated into a press hemming machine, so that heating can be separately and independently installed. The structure is simplified with respect to the apparatus, and the work efficiency is extremely advantageous, which leads to a reduction in the manufacturing cost of the hemmed panel work.

[Brief description of drawings]

FIG. 1 is a side view of a press hemming machine with a heating device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a heating body of the heating device.

FIG. 3 is a side view of a press hemming machine with a heating device according to another embodiment.

FIG. 4 is a side view for explaining the operation of the press hemming machine with a heating device according to FIG.

[Explanation of symbols]

 1 Lower Base 2 Lower Mold 3 Outer Panel 3a, 4a Flange Part 4 Inner Panel 5 Upper Base 7 Bending Blade 8a Ram 10 Pre-Bending Device 13 Pre-Bending Blade 20 Cylinder 22 Cylinder Rod 23 Heater

Claims (3)

[Claims] 1. A pre-bending blade for pre-bending the outer panel flange portion in a state where the inner panel flange portion is overlapped with the outer panel flange portion mounted on the lower die, and both flanges after the pre-bending. In a press hemming machine equipped with a main bending blade that performs main bending to sandwich the inner panel flange part with the outer panel flange part by lowering to the overlapping hemming position, the heating element that heats the flange part is the cylinder. A press hemming device with a heating device, characterized in that it has a cylinder attached to the tip of a rod and that advances the heating element from a standby position to a hemming position through a path that does not interfere with the main bending blade and the preliminary bending blade. Machine. 2. A press hemming machine has a main bending blade provided on an upper base fixed to a ram that is driven up and down, and a pre-bending blade is placed at a hemming processing position on a lower base on which a lower die is placed. It is configured by installing a pre-bending device that advances along the lower base, and a heating body that heats the flange portion is attached to the tip end portion of the cylinder rod on the upper base side, and the heating body is The press hemming machine with a heating device according to claim 1, further comprising a cylinder for advancing from a standby position to a hemming position through a gap between the main bending blade and the preliminary bending blade. 3. A press hemming machine is preliminarily driven to rotate between a main bending blade and a hemming position and an escape position immediately below the main bending blade on an upper base side fixed to a ram driven to move up and down. A heating element that heats the flange portion is attached to the tip of the cylinder rod on the upper base side, and the heating element is placed from the standby position to the main bending blade and the bending blade. The press hemming machine with a heating device according to claim 1, further comprising a cylinder for advancing to a hemming position through a gap between the preliminary bending blades.