JPH0148165B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a hemming structure of a pressed steel plate and aims to improve its performance as a product.

[Prior Art] Generally, the panel portion of an automobile body has a structure in which an inner press product having a relatively strong corrugated plate structure supports an outer press product made of a flat thin plate that constitutes the outer surface of the vehicle. The end of the outer press product is processed into a hemming structure that is folded back toward the edge of the inner press product. The hemming portion, which serves as the edge of the panel portion, is required to have good sealing performance against rainwater when joining to other members.

The conventional hemming structure is a flap-shaped hemming structure as shown in FIG. Because of this, the thickness of the hemming portion 3 could not be secured. Therefore, when joining the other member 4, the other member 4 is extended to the side of the panel 5 having the hemming part 3, and the seal part 6 is It was necessary to apply it to the inner surface of panel 5. In such a structure, a groove is formed between the outer surface of the hemming part 3 and the other member 4, and water tends to accumulate in the groove. Therefore, in order to ensure sufficient sealing performance, the seal part 6 must be made large. At the same time, special measures were required for the extension of the other member 4. Especially in the sunroof panel section,
That is, in the case where the panel 5 in FIG. 1 is a roof panel and the other member 4 is a sunroof panel, in addition to the above-mentioned sealing problem, the sunroof panel 4 is extended to the lower side of the roof panel 5. There was a problem that it could not be opened directly to the upper side.

In addition, as an attempt to solve the above problem, Japanese Utility Model Application Publication No. 56-105429 discloses that the edge of the outer pressed product is folded around the edge of the inner pressed product for hemming, and this hemmed part is moved to the horizontal part. A structure is disclosed in which the seal portion is bent at right angles (this bending is not hemming) to have a certain length. This structure did not create a groove near the sealing part, and the above problem could be solved.

[Problems to be Solved by the Invention] However, with this structure, there is a problem that a corner is formed at the lower end of the bent hanging part, and when a person tries to lift this corner by hand, it is easy to get stuck in the hand and the appearance is poor. In addition, since the bent hanging part is supported in a cantilevered manner at the bend point at the top, the hanging part tends to tilt when a horizontal force is applied to the hanging part, and if it tilts, the sealing performance will deteriorate. In the end, the problem of sealability remains unsolved. Another problem is that the bending process adds one step to the manufacturing process, which goes against the request to shorten the process.

Therefore, an object of the present invention is to solve the above-mentioned problems by improving only the hemming structure in order to impart multi-functions to the hemming structure itself.

[Means for Solving the Problems and Their Effects] In order to achieve this object, in the bag-shaped hemming structure of the present invention, the end portion of the outer press product that is folded back so as to sandwich the end portion of the inner press product,
It is formed into a bag shape that inflates in the thickness direction of the assembly of the inner and outer press products so as to wrap around the end of the pre-bent inner press product, and the outer surface of the bag-shaped hemming structure has a A flat portion extending to is formed. In the case of such a hemming structure, by making the hemming structure bag-shaped, it is possible to increase the plate thickness of the hemming structure, and it is possible to ensure a sufficient length as a sealing part on the outer surface of the hemming structure. Moreover, since a flat part was formed on the outer surface,
It becomes possible for the sealing material to adhere sufficiently, and it becomes possible to make the outer surface of the hemming structure a sealing surface that can exhibit sufficiently good sealing performance. By forming the seal portion on the side surface of the hemming structure, it is possible to eliminate the grooves formed in the conventional joint portion where water tends to accumulate, thereby further promoting sealing performance. Furthermore, the hemming structure with a bag-shaped bulge looks good and increases the product value, and since the bottom corner is not sharp, it will not get stuck even when touched by a person. In addition, the tip of the bag-shaped folded part is crimped to the inner press product, so the flat part of the bag-shaped folded part is supported by both the upper and lower ends, making it difficult to tilt even when horizontal force is applied. High reliability for seals. Furthermore, if the hemming structure of the present invention is applied to the joint between the roof panel and the sunroof panel, it is possible to achieve good sealing performance and eliminate the need for the conventional extension part for sealing the sunroof panel. Direct opening to the top is also possible.

In addition, the bag-shaped hemming structure processing device of the present invention is provided with an upper mold and a lower mold that sandwich the inner pressed product and the outer pressed product, and the end of the outer pressed product is bent by the upper mold, and this bent end is inserted into the inner pressed product. A hemming blade that wraps around and further bends the pre-bent end of the pressed product is moved diagonally from below so as to press the bent end of the outer pressed product to the lower surface of the inner pressed product. The bent end of the outer pressed product is first bent along the pre-bent edge of the inner pressed product, and the part of this bent portion below the lower end of the bent end of the inner pressed product is further bent diagonally upward. It is bent by a hemming blade, and the tip of this bent portion extending obliquely upward is pressed onto the lower surface of the inner press product. Therefore, a cavity is formed between the bent end portion extending obliquely upward and the lower surface of the inner press product, resulting in a bag-shaped folded structure that remains inflated. The outer press product is processed into a bag-shaped hemming structure in which the folded end and the horizontally extending portion sandwich the end of the inner press product. In addition, the edge of the outer pressed product is bent along the bent end of the inner pressed product using the upper end of the bent end of the inner pressed product as a fulcrum, so the outer surface of the hemming structure of the outer pressed product is The shape follows the bent end, and a flat surface serving as a sealing surface is formed on the outer surface of the bent end of the outer press product, allowing good sealing with the sealing material. This flat part is formed to extend in a straight line with a certain length in the thickness direction of the assembly of the inner and outer pressed products, so there is no problem with other parts such as sunroof panels that are joined by hemming structure. The desired purpose of being able to move directly in the thickness direction and opening in the vertical direction is achieved.

[Embodiments] Preferred embodiments of the bag-shaped hemming structure and its processing apparatus of the present invention will be described below with reference to the drawings.

First, the configuration of a bag-shaped hemming structure processing apparatus according to an embodiment of the present invention is shown in FIGS. 2 and 3.
FIG. 2 shows the entire apparatus, and 7 in the figure is a lower die on which an inner press product 8 and an outer press product 9 to be stacked on the inner press product 8 are placed.
It is fixed on the lower surface plate 10. An upper mold 11 is provided above the lower mold 7 and clamps and fixes the inner pressed product 8 and the outer pressed product 9 with the lower mold 7, and the upper mold 11 is fixed to the lower part of the upper surface plate 12. has been done. The upper die 11 is provided with a guide portion 13 that can bend the end portion of the outer press product 9 downward and has a side surface that extends in the vertical direction.

On the side of the lower mold 7, a hemming blade 14 is movable from diagonally downward toward the bent end of the outer pressed product 9 placed on the lower mold 7 together with the inner pressed product 8 by the guide portion 13. It is set in. The hemming blade 14 is connected to a movable bracket 15
It is fixed to and is movable together with the movable bracket 15. The moving bracket 15 is
A cylinder 17 is slidably supported by a guide 16 provided diagonally on the frame portion of the lower surface plate 10 and is fixed to the frame portion of the lower surface plate 10.
It is connected to the tip of the rod via a knuckle portion 18, and is capable of linearly reciprocating along the guide 16 by the operation of the cylinder 17.

The hemming blade 14 has a thick plate structure extending in the vertical direction, and has a horizontal flat surface 20 on the upper end surface 19, and a hemming blade 14 bent diagonally downward from the flat surface 20 toward the cylinder 17 side. A slope 21 extending in the moving direction is formed. The flat surface 20 is such that when the hemming blade 14 is moved diagonally upward by the cylinder 17, the crimping portion of the flat surface 20 toward the lower surface of the inner press product 8 has an appropriate distance from the side surface of the guide portion 13. The positional relationship of each device is determined so that each device is in the same position as the other. Note that 22 is a stopper for the upward movement of the movable bracket 15, and the stopper 22 defines the necessary pressing distance by the upper end flat surface 20 of the hemming blade 14 toward the lower surface of the inner press product 8.

Next, a hemming structure processed using the above device will be described.

FIG. 4 shows the hemming process sequence. An outer pressed product 9 is stacked on an inner pressed product 8 whose end portion is bent downward at a substantially right angle into a flange shape 23 and whose entire body has a corrugated structure to ensure strength. As the upper die 11 descends downward, the guide portion 13 bends the inner press product 8 along the folded end 23 into a flange shape 24 that is longer than the folded end 23 . Thereafter, the hemming blade 14 is advanced diagonally from below toward the bent end 24 extending below the outer pressed product 9, and the bent end 24 is further bent diagonally upward toward the lower surface of the inner pressed product 8. In other words, the hemming blade 1 is moved forward by the operation of the cylinder 17 from diagonally below.
4, the upper end corner first hits near the lower end of the bent end 24 of the outer press product 9 at the position 24-1 shown by the broken line in FIG. Pushing the side surface, the bent end portion 24 is bent to the positions 24-2 and 24-3, and eventually the upper flat surface portion 20 of the hemming blade 14 presses the tip of the bent end portion 24 to the lower surface of the inner press product 8. The hemming blade 14 advances until the hemming blade 14 advances until the stopper 22 stops the hemming blade 14 and reaches the position 24-4, completing the hemming of the end of the outer press product 9.

In the outer press product 9 having the hemmed structure processed in this way, the tip of the bent end portion 24 of the outer press product 9 is pressed onto the lower surface of the inner press product 8 so as to finally sandwich the inner press product 8. There is a space between the obliquely upwardly bent portion of the outer pressed product 9 and the inner pressed product 8, and a bag-shaped hemmed structure that remains swollen in a bag-like shape is obtained. Further, since the bent end portion 24 of the outer pressed product 9 is bent along the outer surface of the bent end portion 23 of the inner pressed product 8, and the outward deformation of the bent end portion 24 at the time of bending is suppressed by the guide portion 13. A flat portion 25 extending in the vertical direction is formed on the outer surface of the bag-shaped hemming structure, that is, on the outer surface of the hemming structure on the guide portion 13 side. Therefore, the hemming structure is bag-shaped and has a flat portion 25 on the outer surface. Due to the bag-shaped bulge, the dimension in the thickness direction of the assembly of the inner and outer press products is significantly increased compared to the conventional flap-shaped hemming structure, and the length of the outer surface extending in the vertical direction is the sealing surface. By ensuring sufficient dimensions for this purpose and forming a flat portion on the outer surface thereof, sufficient adhesion with the sealing material is possible. Adoption of the hemming structure of the present invention ensures good sealing performance with other members.

Further, the bag-shaped hemming structure of the present invention is not limited to the one of this embodiment, for example, as shown in FIG.
In some cases, the edge of the bent end portion 24 of the outer press product 9 is formed in a slightly folded state, and as shown in FIG. The inner reinforcement 26 (considered as a part of the inner press product 8) may be held between the hemming structures, and the hemming structure is bag-shaped, with a flat part for a sealing surface on the outer surface of the bag shape. , and the tip of the bent portion 24 of the outer press product 9 is pressed onto the lower surface of the inner press product 8.

In order to clarify the function of the hemming structure of the present invention, which ensures good sealing performance when joining with other members, more specific application examples will be described.

7 and 8 show the vehicle roof panel 2.
7 and a sunroof panel 28, the bag-shaped hemming structure of the present invention is applied to the roof panel 27 side. As shown in FIG. 8, by forming the end portion of the roof panel 27 into a bag-shaped hemming structure, the thickness of the hemming structure is significantly increased compared to the conventional one, so that there is a gap between the end portion of the sunroof panel 28 and the hemming structure. The sealing surface 30 with the sealing material 29 interposed therein can be the outer surface of the hemming portion, and the conventional extension on the sunroof panel 28 side as shown in FIG. 1 is not required. Moreover, since the sealing surface 30 on the hemming portion side is formed as a flat surface, sufficient adhesion with the sealing material 29 is possible, and good sealing performance can be obtained. Furthermore, since the sealing material 29 is interposed between the ends of the roof panel 27 and the sunroof panel 28, grooves where water tends to accumulate as shown in FIG. 1 are not formed, and good sealing performance is achieved. It will be more helpful. Furthermore, since the conventional extension part extending to the lower side of the roof panel 27 on the side of the sunroof panel 28 is not required, the structure is greatly simplified, and the sunroof panel 28 can be easily opened directly upward. The opening operation is greatly simplified.

[Effects of the Invention] As explained above, when the bag-shaped hemming structure and the processing device of the present invention are used, the thickness of the assembly of the inner and outer pressed products of the hemming structure is reduced by assuming that the hemming structure to be hemmed is bag-shaped. By increasing the distance in the horizontal direction and forming a flat part with sufficient length as a sealing surface on the outer surface of the bag-shaped hemming structure, there is no need to make any special efforts to connect the hemming structure to other parts. Good sealing performance can be obtained. In this bulging bag-shaped hemming structure, the tip of the bent part of the outer pressed product that extends diagonally upward is crimped to the inner pressed product, so the flat part is supported at both the upper and lower ends, and the flat part is supported in the horizontal direction. It does not easily tilt even when the air pressure is applied, and has good sealing properties. In addition, the bulging bag-shaped hemming structure looks good and has a high commercial value, and also has the advantage that the edges will not become difficult to handle even if touched by a person.

Furthermore, if the hemming structure of the present invention is applied to the joint between the sunroof panel and the roof panel of a vehicle, good sealing performance can be obtained, and the sunroof panel can also be opened directly upward.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional hemming structure, FIG. 2 is a side view of a bag-shaped hemming structure manufacturing apparatus according to an embodiment of the present invention, and FIG. 3 is a partial side view of the apparatus shown in FIG. Figure 4 is a side view showing the processing sequence of hemming using the apparatus shown in Figure 2, Figure 5 is a side view of a hemming part showing an application example of the hemming structure of the present invention, and Figure 6 is another example of the hemming structure of the present invention. FIG. 7 is a perspective view of the area around the sunroof panel of a vehicle, and FIG. 8 is a cross-sectional view of the device shown in FIG. 7 taken along the line -. 7...Lower die, 8...Inner press product, 9...Outer press product, 11...Upper die, 13...Guide section, 14...Hemming blade, 15...Movement bracket, 16...Guide, 17... ...Cylinder, 19...
...Upper end surface of hemming blade, 20...Flat surface portion of upper end surface of hemming blade, 21...Slope portion of upper end surface of hemming blade, 22...Stopper, 23...Bent end of inner press product, 24...Outer press product 25...Flat part of the outer surface of the hemming structure,
27...Roof panel, 28...Sunroof panel, 29...Sealing material, 30...Sealing surface.

Claims (1)

[Scope of Claims] 1. In a hemming structure in which the end portion of an outer press product for a vehicle is folded back and the end portion of the inner press product is held between the outer press product, the end portion of the inner press product is bent at a right angle in advance, and the outer press product is folded back. The hemming part of the product is formed into a bag shape that swells in the thickness direction to wrap around the bent end of the inner pressed product, and the tip of the folded part of the bag-shaped outer pressed product is crimped to the inner pressed product to form the outer pressed product. A bag-shaped hemming structure characterized in that a flat part extending in the board thickness direction is formed on the outer surface of the bag-shaped hemming part. 2. The bag-shaped hemming structure according to claim 1, wherein the bag-shaped hemming structure comprises a joint portion of a roof panel of an automobile with a sunroof panel. 3 A lower mold that supports an inner press product having a bent end and an outer press product stacked on the inner press product; Pressing and clamping the outer press product and the inner press product from above and bending the end of the outer press product to the inner press product. an upper mold that is bent downward along the edge; provided on the side of the lower mold, and further bends a portion of the bent end of the outer pressed product lower than the lower end of the bent end of the inner pressed product diagonally upward; a hemming blade that moves from diagonally downward toward the bent end of the outer pressed product so as to press the tip of the diagonally upwardly bent portion to the lower surface of the inner pressed product; a processing device having a bag-shaped hemming structure; .