JP2554768B2 - Mold for flange molding - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flange for forming a flange portion that is substantially perpendicular to the surface of a curved panel material, such as an automobile roof panel. The present invention relates to a molding die.

(Prior Art) FIG. 4 is a view showing the outer appearance of an automobile, in which reference numeral W indicates a roof panel. An opening H for a sunroof is formed in the roof panel W. FIGS. 5 to 8 show a mold conventionally used for molding the roof panel W in which the opening H is formed. In this mold, a roof panel W that has been molded into a predetermined shape in advance
On the other hand, the flange portion F located at the opening H for the sunroof and the flange portion G located at the outer peripheral portion of the panel W are bent.

As shown in FIG. 5, this mold has a lower die punch 10 fixed on the bolster 9 and an upper slide, that is, an upper die body 11 which is vertically movable toward the lower die punch 10. An upper die holder 12 is integrated with the upper die body 11, and a sectional die 13 for bending the flange portion F in cooperation with the lower die punch 10 is attached to the upper die holder 12. In other words, this sectional die 13 is a sectional die for the sunroof flange. Further, a sectional die 14 for bending the flange portion G in cooperation with the lower die punch 10 is attached to the upper die holder 12, and the sectional die 14 is a sectional die for an outer peripheral flange.

Further, the upper die holder 12 is provided with a pad 15 for pressing the roof panel W which is a work by the lower die punch 10 via an elastic body 16. In FIG. 5, reference numeral 17 indicates a guide post attached to the lower die punch 10, and the guide post 17 guides the vertical movement of the upper die holder 12.

After the flange portions F and G are processed by the mold shown in FIG. 5, the upper mold holder 12 is moved to the upper mold body 11
A lifter 18 is provided on the lower die punch 10 in order to raise the roof panel W when ascending together with the lower die punch 10.

As shown in FIG. 6, a plurality of lifters 18 are arranged along the periphery in an opening H for a sunroof formed in a roof panel W. Details of one lifter 18 are shown in FIGS. 7 and 8. A slide casing 21 is vertically movably inserted into a housing hole 20 formed in the lower die punch 10, and a lift block 22 is fixed to a top end portion of the slide casing 21 with a bolt 23. The slide casing 21 is biased upward by a compression coil spring 24. In order to restrict the upper limit position of the slide casing 21 by the spring 24, the lower die punch 10 has a stopper 25.
Are fastened by bolts 26. In order to prevent the sectioning die 13 descending with the lowering of the upper die main body 11 from directly contacting the lift block 22,
A block retainer 27 is fastened to the lower surface of 13 with bolts 28.

Therefore, before the roof panel W, which is formed in a predetermined curved shape, is placed on the lower die punch 10 and the flange portion is not processed, the flange portion F is indicated by the broken line Fa in FIG. As described above, the roof panel W is connected to the main body on the same plane. Under this condition, when the upper die body 11 descends, the sectional die 13 and the lower die punch 10
The flange portion F in FIG.
As shown by, the bending process is performed. At this time, the outer peripheral flange portion G is similarly flanged.

(Problem to be Solved by the Invention) As shown in the drawing, a roof panel W constituting an automobile body has a curved shape in which a central portion projects upward with respect to an outer peripheral portion. In particular, since the opening for the sunroof has such a large degree of curvature, it is necessary to make the tip of the flange F tend to shrink particularly when the flange is molded using the above-mentioned conventional mold. If not sufficiently achieved, the main part of the roof panel W may be flattened or flattened by bending the flange part F to reduce the original curvature.

FIG. 9 shows a flattened state. In this figure, the original shape of the roof panel W is shown by a one-dot chain line, and the shape of the roof panel after forming the flange portion F using a conventional mold is shown by a solid line. As shown in the figure, if the flatness of the flattened panel is δ, the flatness δ may reach up to about 2 to 3 mm in some cases.

Therefore, the present invention does not affect the curved shape of the panel when forming a flange portion in a direction substantially perpendicular to the surface of a panel material formed in a curved shape like a roof panel as a raw material. The purpose is to be able to form a flange with high precision.

(Means for Solving the Problems) The present invention for achieving the above object provides a flange forming mold for forming a flange portion that is substantially perpendicular to the surface of the panel material in the curved panel material. , A sectional die that bends the flange portion in cooperation with the lower die to an upper die that is vertically movable toward a lower die that supports the panel material, and the lower die through the panel material. And a pad that presses, a lifter that engages with a flange portion after molding and raises the panel material is provided on the lower mold so as to be movable up and down, and to the sectional die through the flange portion before completion of molding. A lift block for pressing is provided on the lifter, and an uneven portion that forms an uneven portion on the flange portion in the process of forming the flange portion in cooperation with the sectional die is provided on the lifter. It is a flange forming die provided on the surface of the soft block.

(Operation) When the flange portion of the panel material is bent by the sectional die and the lower die, an uneven portion is formed on the flange portion by the cooperation of the sectional die and the lift block during the bending process. It Therefore, in the process of bending, the difference in length between the boundary portion between the flange portion and the panel material main body portion, that is, the base portion of the flange portion and the tip end portion of the flange portion is absorbed. Even after molding the flange
The shape of the curved portion of the panel material does not change. That is, it does not flatten.

(Example) Hereinafter, the present invention will be described in detail based on an example of the present invention shown in the drawings. FIG. 1 and FIG. 2 are views showing a part of a flange forming mold according to an embodiment of the present invention, and the same parts as those of the conventional mold are designated by the same reference numerals.

The basic structure of the mold of the present invention is almost the same as that of the conventional mold shown in FIG. 5, and the structure of the lifter 18 is mainly different.

In the accommodating hole 30 formed in the lower die punch 10 forming the lower die,
A slide block 31 is mounted so that it can move up and down. The vertical movement of the slide block 31 is achieved by a cushion pin 32 attached to the lower die punch 10 so as to be vertically movable. The cushion pin 32 is driven by driving means incorporated in the press machine such as a hydraulic cylinder (not shown). At the upper limit position of the slide block 31, the contact portion 33 where the stopper 25 fastened to the lower die punch 10 by the bolt 26 is formed on the slide block 31.
It is regulated by hitting.

A lift block 34 is provided at the upper end of the slide block 31.
Is fixed by bolts 35, and this lift block
A plurality of recesses 36 are formed on the upper surface of 34. The portion excluding these concave portions, that is, the convex portion of the upper surface of the lift block 34, which is a flat surface, is placed on the lower die punch 10 when the lift block 34 and the slide block 31 reach the upper limit position. Placed panel material, ie roof panel W
It is almost flush with the bottom surface of. The recess 36 is shown in FIG. 2 (A).
As shown in (B), it is formed so that it gradually becomes deeper toward the tip end side of the flange portion F, that is, the left side in the figure, and the horizontal width gradually becomes closer to the tip end of the flange portion F. It is formed so as to have a maximum width d in the left-right direction in the figure. The maximum depth of the concave portion 36 is indicated by the symbol h.

The sectional die 38 attached to the upper die holder 12 with the bolts 37 moves up and down together with the upper die holder 12.
The lower surface of the sectional die 38 is the lift block.
The shape corresponds to the upper surface of 34. That is, the convex portion 39 is formed at a position corresponding to the concave portion 36, and the other portions are flat.

A procedure for forming the flange portion of the roof panel W using the mold having the above structure will be described.

First, with the roof panel W having the sunroof opening H perforated in the previous step placed on the lower die punch 10, the upper die body, that is, the upper slide 11 is lowered by the driving means (not shown). come. As a result, first, the pad 15 hits the panel material W, and the elastic body 16 contracts as it continues to descend, so that the panel material W is strongly pressed by the pad 15.

As the descent further proceeds, a portion of the panel material W corresponding to the flange portion F is sandwiched between the upper surface of the lift block 34 and the lower surface of the sectional die 38. Flange F
The state before being plastically deformed in FIG.
Indicated by Fa. Due to this sandwiching, the flange portion F
Is bent with respect to the main body of the panel W,
It is formed into an uneven shape. In FIG. 2 (A), the state when the molding of the flange portion F is started is indicated by the reference sign Fb. The deformed state at this time corresponds to FIG. 3 (A). In the molding process, the cushion pin 32 exerts an upward load on the slide block 31 and the lift block 34, which is sufficient to withstand the formation of the uneven portion on the flange portion F.

Further, when the sectional die 38 descends, the flange portion F is bent while being deformed by drawing so that the uneven portion formed on the flange portion F is returned. In FIG. 2 (B), the flange portion in the middle of molding is indicated by the symbol Fc. Since a plurality of uneven portions are formed on the flange portion F during this molding, the tip portion of the flange portion F tends to be narrowed and gradually bent.
The portion of the panel W other than the above, that is, the curved shape of the main body of the panel is not affected. Further, after the molding of the flange portion F is finished, a slight uneven portion remains, and the curved shape of the panel W after the molding has a flatness amount δ as shown in FIG. 3 (B). Becomes 0,
A product with a regular shape is obtained.

After finishing the molding of the flange part in this way,
As the upper slide 11 moves upward, the sectional die 38 and the pad 15 are separated from the panel W first. At that stage, by pushing up the cushion pin 32,
The panel W is extracted from the lower die punch 10. The rising timing of the cushion pin 32 is controlled by the press machine side.

The flange portion G formed on the outer peripheral portion of the panel material W
Is also formed at the same time when the flange portion F is formed. Further, in the above embodiment, the lift block 34 and the slide block 31 are configured as separate bodies, but they may be integrally molded. Furthermore, although the roof panel is used as the panel material in the above-described embodiment, the panel material is not limited to this, and any panel material that is curved can be used.
Any panel material will do.

(Effect of the Invention) As described above, according to the present invention, when the flange portion of the panel material is bent by the sectional die and the lower die, in the process of the folding step, the sectional die and the lift block are As a result, the uneven portion is formed on the flange portion. That is, in the process of bending, the boundary portion between the flange portion and the panel material main body portion, that is, the base portion of the flange portion,
Since the difference in length from the tip of the flange portion is absorbed, it is possible to form a high quality panel material without changing the shape of the curved portion of the panel material even after the flange portion is formed. .

[Brief description of drawings]

FIG. 1 is a perspective view showing a lifter mainly provided in a lower die of the flange forming die of the present invention, and FIG. 2 (A) shows a main part of the forming die of the present invention at the start of forming. ,
A sectional view taken along the line II-II in FIG. 1, FIG. 2 (B) is a sectional view showing a state during molding of the mold shown in FIG. 1 (A), and FIG. 3 (A) is a sectional view. Sectional drawing which shows the shape of the flange part at the time of a start, FIG.3 (B) is a perspective view which shows the panel material after completion of shaping | molding, FIG.4 is a perspective view which shows an example of a panel material,
FIG. 5 shows a conventional molding die, and V- in FIG.
FIG. 6 is a cross-sectional view taken along line V, FIG. 6 is a perspective view showing a lower mold of the molds shown in FIG. 5, FIG. 7 is a view showing the lifter part shown in FIG. 5, and FIG. Sectional view taken along line VII-VII, FIG. 8 is a perspective view showing the lifter portion, FIG. 9 is a perspective view showing a defect occurrence situation caused by a conventional mold, 10 ... lower die punch, 11 ... upper die body , 15 …… Pad, 18
...... Lifter, 34 …… Lift block, 36 …… Concave, 38
...... Sectional die.

Claims (1)

(57) [Claims] 1. A flange forming die for forming a flange portion formed on a curved panel material at a substantially right angle to the surface of the panel material. The flange molding die is vertically movable toward a lower die supporting the panel material. The upper die is provided with a sectional die for bending the flange portion in cooperation with the lower die, and a pad for pressing the lower die via the panel material. A lifter that raises the panel material in combination is provided on the lower die so as to be movable up and down, and a lift block that presses the sectional die through the flange portion before the completion of molding is provided on the lifter. A flange-molding die, which is provided on the surface of the lift block with an uneven portion that forms an uneven portion on the flange portion in the process of forming the flange portion by cooperation.