JP3804394B2 - Hemming machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hemming processing apparatus , for example, a pre-bending process (pre-hemming) of a hemming flange portion when hemming an outer panel and an inner panel forming an opening / closing body such as an automobile door, a hood, or a trunk lid at the peripheral portion. ) and followed the bending (hemming) and about the hemming apparatus of the so-called table top type to perform.
[0002]
[Prior art]
For example, when a hemming connection between an outer panel and an inner panel forming a hood of an automobile is performed, a so-called one-motion type hemming apparatus that performs a main bending process immediately after a pre-bending process is a hemming process target as shown in FIG. A plurality of independent pre-bending blades 51 to 56 are arranged on the entire periphery of the panel for each side, and at least the left and right pre-bending blades 55 and 56 are at the same timing in the left and right direction, and in the front and rear direction The pre-bending blades 51, 52, 53, and 54 are adjusted in advance so that they are simultaneously in contact with the hemming flange portion F1 on the outer panel W1 side to be hemmed at the same timing. Then, following these preliminary bending processes, the main bending process is performed in a substantially similar manner.
[0003]
In the case of the opening / closing body of an automobile, as is clear from FIG. 7 , the panels W1 and W2 are overlapped so that the outer panel W1 hemmed to the inner panel W2 is on the lower side. The hemming flange portion F1 is formed upright in advance on the outer panel W1.
[0004]
[Problems to be solved by the invention]
In the conventional structure as described above, especially in the table top type hemming processing apparatus, the hydraulic or pneumatic type drive cylinders that are the drive sources of the respective pre-bending blades 51 to 56 are usually independent of each other. Therefore, it is difficult to take complete synchronization as the operation timing of the left and right pre-bending blades or the front and rear pre-bending blades, and as shown in FIG. 7, for example, the pre-bending that hits the hemming flange portion F1 first. Under the force of the blade 55, the outer panel W1 escapes to either one of them. This relief f is nothing but the relative position of the outer panel W1 and the inner panel W2 being shifted, and as a result, the main bending process is performed with the relative position being shifted, which improves the quality of the hemming process. There is still room for improvement.
[0005]
On the other hand, as countermeasures against positional deviation between the outer panel W1 and the inner panel W2, a countermeasure such as adding a lower mold 58 that supports the central portion of the outer panel W1 or pressing the inner panel W2 with the inner pad 59 is also available. However, it is still not possible to completely prevent the positional deviation between the outer panel W1 and the inner panel W2.
[0006]
On the other hand, in order to improve the sealing performance at the above-mentioned hemming joint, a viscous sealant (sealer or sealant) is applied in advance to the joint area between the two, and the two are hemmed together while retaining the sealant. Some techniques have been proposed in which hard particles such as fine glass beads are mixed in the sealing agent in advance.
[0007]
If hard particles are mixed in the sealing agent intervening in the hemming joint, the hard particles are bitten into the panel at the hemming joint under the pressure applied during the main bending process. Since the frictional force between the outer panel and the inner panel after hemming is prevented, the frictional force between the two is dramatically increased.
[0008]
However, since the hard particles bite into the panel surface during the main bending process, the effect of preventing misalignment between the panels due to the biting of the hard particles can be expected at the preliminary bending stage, for example. I can't.
[0009]
The present invention has been made paying attention to the above problems, and it is based on the premise that a sealing agent in which hard particles such as glass beads are mixed in advance is used, but the effect of improving the frictional force by the special sealing agent. Is intended to provide a hemming apparatus that can be obtained from the preliminary bending stage.
[0013]
[Means for Solving the Problems]
The invention described in claim 1 has a swing-type main bending blade as well as a swing-type pre-bending blade independent of each other, and a sealing agent is used in combination when hemming at least two panels. However, it is assumed that the apparatus performs hemming.
[0014]
A base member and a lower mold provided on the base member and positioned and mounted in a state where at least two panels having the sealing agent interposed in a hemming coupling portion on the upper surface are overlapped with each other; A hemming flange that is supported by the base member in a rotatable manner and swings between a pre-bending evacuation position and a pre-bending processing position, and a hemming flange part that is bent in advance at the end of one of the panels. A pre-bending blade that performs a pre-bending process until an inclination angle is reached, and is also rotatably supported by the base member and swings between a main bending retracting position and a main bending processing position to perform preliminary bending first. a main bending blade subjected to the bending a hemming flange working is applied, a common actuator for both swinging operation and a preliminary bending blade and the bending blade, the operation of the actuator And and a switching means for selectively switching whether to pre-bending operation the preliminary bending blade through the main bending blade based on the operation of the bending or or the actuator is machining operation alone the bending blade Zui Yes.
[0015]
In addition, prior to the pre-bending process and the subsequent main bending process, the main bending blade performs a pre-pressurizing operation equivalent to that of the main bending process to apply pressure to the hemming joint. It is characterized in that the frictional force of the sealing agent present in the hemming binding site is positively increased.
[0016]
In this case, as the sealing agent, for example , as in the invention according to claim 2, hard particles such as glass beads are previously mixed in a viscous base material, and the pressure agent is subjected to the above pressure. A hard particle having a function of positively increasing the frictional force at the hemming bonding site between the panels is used by biting the panel surface. However, the hard particles may be made of a material other than glass beads as long as they have an equivalent function.
[0017]
Therefore, according to the first and second aspects of the invention, either the main bending operation or the pre-bending operation is selectively performed by the operation of the common actuator. Although it is performed by a single swinging operation, the pre-bending process is performed by a pre-bending blade that swings for the first time when the main bending blade is swung. Prior to the pre-bending process, the hard particles mixed in the sealing agent are applied to the hemming bonding site in which the sealing agent is intervened in advance, for example, by applying a pressing force equivalent to that in the main bending process. From this moment, the effect of increasing the frictional force is exhibited. Thereby, it becomes difficult to produce the position shift between an outer panel and an inner panel at the time of a preliminary | backup bending process.
[0022]
In this case, as in the invention according to claim 3 , the switching means is provided on the main bending blade and is in contact with the preliminary bending blade in the middle of the swing trajectory of the main bending blade, and the preliminary bending blade. It is desirable to form it with a follower member that can be selectively switched between a position that does not abut against the position.
[0024]
【The invention's effect】
According to the first aspect of the present invention, prior to the pre-bending process of the hemming flange portion, for example, a pressure equal to that at the time of the main bending process is applied to the hemming joint portion between the panels having the sealing agent interposed therebetween. Since the pre-pressurization is performed, the function to positively increase the frictional force at the hemming joint site by the sealing agent from the point of pressurization is exerted, especially when the outer panel and the inner panel are displaced during pre-bending. The hemming quality is greatly improved.
[0025]
Further, the pre-bending process performed based on the swinging motion of the pre-bending blade and the main bending process including the pre-pressurizing operation performed based on the swinging motion of the main bending blade are performed by the operation of a common actuator. Therefore, there is an advantage that the number of actuators required can be reduced and the device configuration can be simplified. In addition, the main bending blade can be operated by main bending alone or the preliminary bending blade can be pre-bent through the main bending blade. Since it has a switching means for selectively switching between machining operations, the operations of the main bending blade and the pre-bending blade are performed more stably, and the pre-bending blade and the main bending blade are close to each other. There is an advantage that the swing stroke of the pre-bending blade can be made relatively small when it is arranged.
[0026]
In particular, as in the invention described in claim 2, as the sealing agent, hard particles such as glass beads are preliminarily mixed in a viscous base material, and the hard particles are subjected to pressure when the hard particles are opposed to each other. The use of a material having a function of positively increasing the frictional force at the hemming joint between the panels by biting into the panel makes the above effect even more remarkable.
[0029]
According to the invention described in claim 3, since the follower member is used as means for operating the pre-bending blade through the main bending blade, the same as the invention described in claim 1 or 2 . In addition to the effect, there is an advantage that the preliminary bending blade can be faithfully followed by the movement of the main bending blade.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing a hemming processing method premised on the hemming processing apparatus according to the present invention, and shows an example of assembling an opening / closing body formed with an outer panel and an inner panel such as a door or a hood of an automobile. Yes.
[0031]
As shown in FIG. 1A and FIG. 2A, a hemming flange portion F1 is formed upright in advance at the peripheral portion of the outer panel W1, and the upper portion of the outer panel W1 on which the hemming flange portion F1 is formed. The inner panel W2 is superposed on the outer panel W2 and used for hemming, but the sealing agent S is preliminarily bead-shaped so that a viscous sealing agent is interposed at the polymerization site of the outer panel W1 and the inner panel W2. To be applied.
[0032]
This sealing agent S is, for example, a mixture of fine glass beads (material is SiO ₂ ) G having a diameter of about 150 μm to 250 μm as hard particles in a base material which is an epoxy resin type sealing agent. By applying an external force to crush the applied sealing agent, the glass beads G have a property of biting or biting into the other panel surface.
[0033]
Then, after positioning the outer panel W1 and the inner panel W2 on the die 2 as the lower mold, an external force is applied from above the hemming flange portion F2 on the inner panel W2 side by the pre-pressurizing punch 21, and FIG. ) Crush the sealing agent S applied in a bead shape in advance. As a result, as described above, the glass beads G preliminarily mixed in the sealing agent S are bitten into the outer panel W1 itself or the surface of the hemming flange portion F2 on the inner panel W2, and as a result, they are overlapped with each other. This acts to dramatically improve the frictional force between the outer panel W1 and the inner panel W2.
[0034]
Here, in order to allow the glass beads G mixed in the sealing agent S to be evenly and reliably bitten into the counterpart panel, the applied pressure is set to the same size as that in the main bending process described later. desirable.
[0035]
Subsequently, as shown in FIGS. 1B and 2C, a plurality of independent open / close members for each side with respect to the hemming flange portion F1 on the outer panel W1 side in the above-described positioning state. The preliminary bending blade 8 is moved forward from the lateral direction, and the hemming flange portion F1 is folded back to about 45 degrees to perform preliminary bending processing (pre-hemming processing).
[0036]
At this time, a relative positional shift is caused between the outer panel W1 and the inner panel W2 due to subtle operation timing of each preliminary bending blade 8, but it is mixed in the sealing agent S at the hemming joint portion. Since the glass beads G are engaged with the outer panel W1 itself or the hemming flange portion F2 on the inner panel W2 side, the frictional force resists the relative positional shift between the outer panel W1 and the inner panel W2, and prevents the panel shift. become.
[0037]
After this, as shown in FIG. 1C and FIG. 2D, following the pre-bending process, the main bending blade 7 is applied to the hemming flange portion F1 that has been subjected to the pre-bending process. The main bending process is performed at, and the hemming flange portion F1 is further folded until it becomes flat, thereby completing the main bending process.
[0038]
At this time, the glass beads G mixed in the sealing agent S receive the main bending force and further bite into the hemming joint, thereby contributing to the improvement of the bonding strength between the outer panel W1 and the inner panel W2.
[0039]
As described above , according to the hemming method , the sealing agent S interposed in the hemming joint between the outer panel W1 and the inner panel W2 is pre-pressurized prior to the pre-bending process and is mixed in the sealing agent S. Since the effect of enhancing the frictional force by the glass beads G is obtained from an early stage, it is possible to reliably prevent the panel displacement at the time of preliminary bending, which has been a problem in the past.
[0040]
FIGS . 3A and 3B are diagrams showing an example of a hemming apparatus for hemming including the pre-pressurizing operation as a preferred embodiment of the hemming apparatus according to the present invention .
[0041]
As shown in FIG. 3, a die 2 functioning as a lower mold is fixed to the base frame 1, and two large and small swing arms 3 and 4 are swingably supported via hinge pins 5 and 6, respectively. ing. A main bending blade 7 is integrally fixed to the tip of one swing arm 3, and a preliminary bending blade 8 is integrally fixed to the tip of the other swing arm 4. The swing arm 4 on the side of the preliminary bending blade 8 is also fixed. Is constantly biased counterclockwise by the tension coil spring 9. Further, a trunnion type drive cylinder (hydraulic cylinder or air cylinder) 10 that can swing as an actuator is supported on the base frame 1, and a piston rod 11 of the drive cylinder 10 is a swing arm on the side of the main bending blade 7. 3 is connected. Accordingly, the swing arm 3 together with the main bending blade 7 between the main bending retract position shown in FIG. 3A and the main bending position P11 shown in FIG. Oscillates.
[0042]
An auxiliary arm portion 12 is integrally formed on a part of the swing arm 3 on the main bending blade 7 side, and a bracket portion 13 is fixed to the auxiliary arm portion 12. A slide shaft 15 having a follower roller 14 at the tip is supported on the bracket portion 13 via a collar 16 so as to be movable back and forth. That is, the follower roller 14 is connected to a piston rod 18 of a switching cylinder (hydraulic cylinder or air cylinder) 17 disposed on the same axis as the slide shaft 15, while the forward position P 1 and the auxiliary arm portion 12 are connected to each other. It can move forward and backward with respect to the retracted position P2 that is housed in the formed escape hole 19.
[0043]
In the state where the follower roller 14 is in the retracted position P2, the follower roller 14 does not come into contact with the swing arm 4 on the preliminary bending blade 8 side even if the swing arm 3 on the main bending blade 7 side swings. On the other hand, in the state where the follower roller 14 is in the forward movement position P1, on the contrary, when the swing arm 3 on the main bending blade 7 swings, the follower roller 14 contacts the swing arm 4 on the preliminary bending blade 8 side. In contact therewith, the swing arm 4 on the preliminary bending blade 8 side swings through the swing arm 3 on the main bending blade 7 side.
[0044]
That is, it is assumed that the follower roller 14 and the switching cylinder 17 use the drive cylinder 10 in common for driving the swing arm 3 on the main bending blade 7 side and driving the swing arm 4 on the preliminary bending blade 8 side. Then, the swing arm 3 on the main bending blade 7 side is swung independently, or the swing arm 4 on the preliminary bending blade 8 side is swung through the swing arm 3 on the main bending blade 7 side. Switching means 20 for selectively switching between the two is formed. The swing arm 4 on the side of the pre-bending blade 8 swings between a pre-bending retract position P22 shown in FIGS. 3 and 4 and a pre-bending position P21 shown in FIG. It is like that.
[0045]
Therefore, according to the hemming processing apparatus configured as described above, the sealing agent S interposed in advance between the outer panel W1 and the inner panel W2 shown in FIG. 1A and FIG. When pre-pressurizing to crush, the outer panel W1 and the inner panel W2 are positioned on the die 2 of FIG. 3, and then the swing arm 3 on the side of the main bending blade 7 is swung.
[0046]
That is, as shown in FIG. 4, the drive cylinder 10 is extended in a state where the follower roller 14 is held at the retracted position P2, and the pre-pressurization described above is applied to the main bending blade 7 even before the pre-bending process. Using this as the punch 21, the main bending process is once performed. As a result, the bending blade 7 directly contacts the hemming flange portion F2 on the inner panel W2 side without contacting the hemming flange portion F1 on the outer panel W1 side (see FIG. 2B), and between the outer panel W1. The sealing agent S interposed is crushed. As a result, as described above, the glass beads G preliminarily mixed in the sealing agent S become a form of biting on the panel surface of the hemming joint.
[0047]
Even if the swing arm 3 on the side of the main bending blade 7 swings, the follower roller 14 is in the retracted position P2 as shown in FIG. The swing arm 4 on the side of the pre-bending blade 8 is not in contact with the swing arm 4 and still stands by at the previous position, that is, the pre-bending retract position P22.
[0048]
Subsequently, the swing arm 3 on the side of the main bending blade 7 is temporarily returned to the original position by the reverse operation of the drive cylinder 10 and then the follower roller 14 is operated by the operation of the switching cylinder 17 as shown in FIG. Is held at the forward movement position P1, and the drive cylinder 10 is again extended in this state. When the swing arm 3 on the main bending blade 7 side starts to swing with the extension operation of the drive cylinder 10, the follower roller 14 immediately moves to the swing arm 4 on the pre-bending blade 8 side as shown in FIG. As shown in FIGS. 1B and 2C, the swing arm 4 on the side of the pre-bending blade 8 swings while being in contact with the movement of the swing arm 3 on the side of the main bending blade 7. The preliminary bending blade 8 comes into contact with the hemming flange portion F1 of the outer panel W1 to perform preliminary bending.
[0049]
At this time, since the glass beads G contained in the sealing agent S interposed between the outer panel W1 and the inner panel W2 are already biting into the panel surface, the hemming flange portion F1 is laterally moved during the preliminary bending process. Even if a force is received, the effect of increasing the frictional force by the glass beads G counters this, and the relative displacement between the outer panel W1 and the inner panel W2 is prevented.
[0050]
When the pre-bending process is performed in this way, the swing arm 3 on the main bending blade 7 side and the swing arm 4 for the pre-bending process are once returned to their original positions by the reverse operation of the drive cylinder 10 and switched in that state. By operating the cylinder 17, the follower roller 14 is returned to the retracted position P2 as shown in FIG. 4B.
[0051]
Then, when the swing arm 3 on the main bending blade 7 side is swung in the same manner as the first pre-pressurization operation, the hemming flange on the outer panel W1 side on which the main bending blade 7 has been subjected to the pre-bending process first. The main bending process is performed on the hemming flange F1 as shown in FIG. As a result, the outer panel W1 and the inner panel W2 constituting the opening / closing body are securely hemmed together, and at the same time, the glass beads G contained in the sealing agent S interposed in the hemming joint are hemming-bonded. This further contributes to the improvement of the hemming bond strength.
[0052]
In this way, according to the present embodiment, as shown in FIG. 3, the swing arm 4 for pre-bending and the swing arm 3 for main bending are used while sharing the single drive cylinder 10. By properly using them, the pre-bending process and the pre-bending process in addition to the pre-bending process can be continuously performed.
[Brief description of the drawings]
FIG. 1 is a process explanatory view showing a hemming processing method premised on a hemming processing apparatus of the present invention.
FIG. 2 is an operation explanatory diagram enlarging the main part of FIG. 1;
3A and 3B are diagrams showing an embodiment of a hemming processing apparatus according to the present invention, in which FIG. 3A is an explanatory diagram of a main part configuration, and FIG. 3B is an enlarged plan view of a main part of FIG.
4A is an explanatory diagram of a main part configuration when the hemming apparatus of FIG. 3 performs a pre-pressurizing operation or a main bending operation, and FIG. 4B is an enlarged plan view of the main part of FIG.
5A is an explanatory diagram of a main part configuration when the hemming apparatus of FIG. 3 performs a pre-bending operation, and FIG. 5B is an enlarged plan view of the main part of FIG.
FIG. 6 is an explanatory view showing an example of a conventional hemming method.
7 is an enlarged cross-sectional view of a main part of FIG.
[Explanation of symbols]
2 ... Die (lower mold)
DESCRIPTION OF SYMBOLS 3 ... Swing arm 4 ... Swing arm 7 ... Main bending blade 8 ... Pre-bending blade 10 ... Drive cylinder 14 ... Follower roller 17 ... Switching cylinder 20 ... Switching means F1 ... Hemming flange part F2 on the outer panel side ... Hemming flange on the inner panel side Part G: Glass beads (hard particles)
P1 ... Advance position P2 ... Retraction position P11 ... Final bending position P12 ... Final bending position P21 ... Pre-bending position P22 ... Pre-bending position S ... Sealing agent W1 ... Outer panel W2 ... Inner panel

Claims (3)

An apparatus that has a swing-type main bending blade as well as a swing-type pre-bending blade that is independent from each other, and performs hemming while using a sealing agent together when hemming at least two panels together. ,
A base member;
A lower mold provided on the base member and positioned and mounted in a state in which at least two panels with the sealing agent interposed at the hemming bonding site are overlapped with each other on the upper surface;
A hemming flange portion, which is supported by the base member so as to rotate and swings between a pre-bending retracting position and a pre-bending position, is bent in advance at the end of one of the panels. A pre-bending blade that performs pre-bending until an inclination angle of
Similarly, the main member that is rotatably supported by the base member and swings between the main bending retracted position and the main bending position to perform the main bending process on the hemming flange portion that has been subjected to the preliminary bending process. A bending blade,
A common actuator that swings both the pre-bending blade and the main bending blade;
A switching means for selectively switching whether the main bending blade is independently operated for main bending based on the operation of the actuator or whether the preliminary bending blade is operated for preliminary bending via the main bending blade based on the operation of the actuator; ,
With
Prior to the pre-bending process and the subsequent main bending process, the main bending blade performs a pre-pressurizing operation equivalent to the main bending process in advance, thereby applying pressure to the hemming joint part and the hemming joint part. A hemming apparatus characterized by positively increasing the frictional force of the sealing agent intervening in the sealant. The sealing agent is obtained by mixing hard particles in a viscous base material in advance, and the hard particles have a function of positively increasing the frictional force at the hemming joints between the panels under pressure. The hemming processing device according to claim 1, wherein the hemming processing device is provided. The switching means is provided on the main bending blade and selectively switches the position between a position in contact with the pre-bending blade and a position not in contact with the pre-bending blade in the middle of the swing trajectory of the main bending blade. The hemming processing apparatus according to claim 2, wherein the hemming apparatus is formed with a follower member capable of performing the following.

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