JP2533657B2 - Flanging method for panel parts - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for performing flange bending on a peripheral portion of a panel component represented by a hood outer panel of an automobile.

2. Description of the Related Art For example, in a hood outer panel P of an automobile shown in FIGS. 5 and 6, flange portions F ₁ , F ₂ , F ₃ are provided all around the hood outer panel P for hemming connection with a mating hood inner panel.
Is bent and molded. The processing of the flange portions F ₁ , F ₂ , F ₃ is performed in one step by using, for example, a press die shown in FIGS. 7 and 8, and the flange portions of the rear end portion and both side portions of the panel P are processed.
While F ₂ and F ₃ are formed by cooperation of the sectional die 4 on the upper holder 2 side and the punch 5 or the collapse punch 6 as the lower mold, the flange portion F _{1 at} the front end of the panel P has the upper holder 2 It is formed by cooperation of the punch 5 and the sectional die 8 fixed to the side slide cam 7. Reference numeral 3 is a pad that constitutes the upper die 1 together with the upper holder 2, and 9 is a drive cam that is fixed to the punch 5 and drives the slide cam 7.

After the molding is completed, the lifter 10 built in the punch 5 waits for the upper mold 1 to rise, and the panel P, which is a molded product, is pushed up. Prior to that, the collapse punch 6 is moved by the air cylinder 11 as shown in FIG. Is slid in the direction of the arrow m1 and the entire panel P is shifted in the direction of the arrow m1 by this sliding amount. As a result, the interference between the flange portion F _{1 at} the front end of the panel P and the punch 5 is avoided for the first time, and the panel P can be pushed up above the punch 1.

Here, as shown in FIGS. 8 and 9, the flange portion
A flange lifter 12 that moves up and down according to the lifting operation of the upper holder 2 is provided on the peripheral edge of the punch 5 corresponding to F ₂ and F ₃ . The flange lifter 12 has a nest block 14 and a lifter plate 15 that come into contact with the pusher pin 13 on the side of the sectional die 4, and the nest block 14 makes the end of the panel P placed on the punch 5 abut. This serves to position the panel P before flange processing,
Further, the lifter plate 15 plays a role of abutting the tips of the processed flange portions F ₂ and F ₃ and pushing them up to separate the flange portions F ₂ and F ₃ from the punch 5 (the structure of the flange lifter 12). Is disclosed, for example, in Japanese Utility Model Publication No. 61-82716).

A part of the punch 5 is divided as an auxiliary punch 16 as shown in FIGS. 8 and 10, and the auxiliary punch 16 interferes with the collapse punch 6 when the collapse punch 6 slides. In order to prevent this, slide displacement is made by stroke S in the direction of arrow m3 in FIG.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional press-type structure as described above, when the panel P is inserted, the rear end portion and both side portions of the panel P are brought into contact with the nest block 14 of the flange lifter 12 and positioned. However, the front end portion of the panel P (the portion where the flange portion F ₁ is molded) does not have any restriction for its position, so that a positional deviation Q is likely to occur as shown in FIG. 11, and the flange length, etc. It is not possible to expect improvement in shape accuracy due to variation.

Therefore, for example, as shown in FIG. 12, while installing the nest block 17 also in the portion that should be the flange portion F ₁ ,
The end portion of the panel P is brought into contact with the nest block 17 for positioning, and when the flange is formed by the sectional die 8 (FIG. 7), the nest block 17 is lowered in accordance with the downward displacement of the upper die 1 to move the sectional die 8 in position. A structure that avoids the interference with is conceivable.

However, according to this structure, as shown in FIG. 12, when the panel P after flange forming is horizontally moved and then pushed up, the flange portion F ₁ and the nest block are
Since it interferes with 17 and the panel P cannot be pulled out upward, there is still a problem in practical use.

The present invention has been made in view of the above problems, and an object of the present invention is to position a panel component before forming a flange on the premise of adopting the movable nest block as described above. It is an object of the present invention to provide a fluging process method capable of performing the above-mentioned process and easily removing the panel component from the lower mold after the flange forming.

Means for Solving the Problems According to the present invention, after the end portion of a panel component after trimming is brought into contact with a nest block on the lower mold side and positioned, the panel component is pressure-constrained by the upper and lower molds, and these upper and lower molds are pressed. A slide cam driven by the forward direction from a direction inclined by a predetermined angle with respect to the pressure restraining direction, the flange portion is bent and formed at the end of the panel component by the cooperation of the slide cam and the lower mold, and the flange portion is A method of horizontally moving the panel part in order to avoid the interference between the flange part and the lower mold when taking out the bent panel part to the upper side of the lower mold. A local excess tongue piece that points diagonally downward in a pressure restrained state by the upper and lower molds is integrally formed in advance at the end, and the end surface of the excess tongue piece can be moved up and down provided on the lower mold side. Ness Depending on the forward displacement of the slide cam when the flange part is bent by the process of contacting the vertical vertical wall surface of the lock block to position the panel part on the lower mold, and the cooperation of the slide cam and the lower mold. Pressing down the nest block and simultaneously cutting and removing the excess tongue portion by the shearing action of the cutting blades provided on the slide cam and the lower mold. Then, the horizontal movement amount of the panel component necessary to avoid the interference between the flange portion after the flange molding and the lower die is set to l1, and the vertical wall surface of the nest block and the bottom wall surface of the nest block with which the tip surface of the excess tongue portion abuts When the distance between the mold and the horizontal direction and the horizontal movement of the panel component after flange molding is l2, the protruding length of the excess tongue piece is a length that satisfies the relationship of l2> l1. Is set to.

Function According to this method, prior to the flange forming, the surplus tongue piece that is integrally formed in advance is brought into contact with the nest block to position the panel component with respect to the lower mold, and the positioned panel component is positioned in the upper and lower molds. The surplus tongue part loses its function after pressure restraint.

Therefore, when the flange is formed by the cooperation of the lower mold and the slide cam, the excess tongue piece is cut and removed at the same time. As a result, a space sufficient for horizontally moving the panel parts is secured between the lower mold and the nest block to avoid interference between the lower mold and the flange portion, and the nest block has a positioning function for the panel parts. At the same time, it is a work to take out the panel parts to the upper part of the lower mold without having any difficulty while having them.

Embodiment FIG. 1 is an explanatory view showing the construction of an embodiment of the present invention, in which parts common to those of the conventional example are designated by the same reference numerals.

As shown in FIG. 1, in a punch 5 as a lower die, a cutting edge block 22 having a cutting edge 21 for cutting is integrally fixed below a flange forming part 5a, and a cutting edge is provided on a sectional die 8. A cutting edge 23 corresponding to the cutting edge 21 on the block 22 side is formed.

Further, the punch 5 is provided with a nest block 25 biased upward by a coil spring 24 so as to be vertically movable, while the slide cam 7 having the sectional die 8 attached thereto comes into contact with a roller 26 on the nest block 25 side. arm
27 are integrated. Roller 26 and arm 27 above
Is provided to push down the nest block 25 in accordance with the slide displacement of the slide cam 7, and the timing at which the pushing of the nest block 25 is started is, as will be described later, the pad 3 is a hood outer panel (hereinafter referred to as a panel component). , Simply referred to as a panel) P is set after the pressure is restricted.

In the flange forming procedure using such a mold structure, the panel P is placed on the punch 5 as in the conventional case, and the forming is performed. Prior to that, the trimming process of the preceding process is performed as shown in FIG. At the front end of the panel P, which is to become the flange F _1, is left uncut, and the local excess tongue S is substantially integrally formed in advance at the front end of the panel P.

Then, as shown in FIG. 3, the tip surface of the excess tongue piece S at the front end of the panel P is attached to the vertical vertical wall surface 25a of the nest block 25.
The upper die 1 is moved down after being brought into contact with and positioned. At this time, the rear end portion and both side portions of the panel P are positioned by the flange lifter 12 shown in FIG. 9 as in the conventional case.

When the upper mold 1 descends, the pad 3 first presses and restrains the panel P on the punch 5 (Fig. 3), and when the upper mold 1 descends, the nest block 25 is gradually pushed down by the arm 27 of Fig. 1. While the sectional die 8 is punched 5
The slide cam 7 is moved forward with respect to the flange forming part 5a.

When the sectional die 8 advances, the cutting blade block 22 and the cutting blades 21, 23 of the sectional die 8 mesh with each other as shown in FIG. The flange portion F ₁ is bent and formed by the cooperation of the flange forming portion 5a of the punch 5 and the sectional die 8.

When the molding of the flange portion F ₁ is completed, the upper die 1 is lifted to move the sectional die 8 together with the slide cam 7, the nest block 25 is also lifted accordingly, and finally the pad 30 is separated from the panel P.

Then, in order to avoid the interference between the molded flange portion F ₁ and the flange molded portion 5a, the panel P is subjected to a predetermined amount by the collapse punch 6 shown in FIG. After being horizontally moved in the direction of arrow m1 in FIG. 4, the lifter 10 (FIG. 7) pushes it up above the punch 5.

At this time, due to the existence of the surplus tongue component S, the punch 5
The position of the nested block 25 against the flange forming portion 5a is not only lower than conventional panels P required to avoid interference with the length l1 or flange portion F ₁ and the punch forming portion 5a of the flange portion F ₁ The horizontal movement amount l1 of the flange forming part 5a and the vertical wall 25a of the nest block 25a.
Dimension L2 between the vertical wall surface 25a of the nest block 25 and the flange forming portion 5 to which the tip surface of the excess tongue S first comes into contact.
Since the horizontal distance l2 formed by a (the distance by which the panel P can move in the horizontal direction) 12 is larger, even if the panel P is moved horizontally, the flange portion F ₁ does not interfere with the nest block 25 and the panel P Is smoothly pushed above the punch 5.

As described above, according to the present invention, an excess tongue piece is integrally formed in advance at the end of the panel component, and the excess tongue piece is brought into contact with the nest block for positioning, By bending and molding the flange, the excess tongue is cut and removed at the same time, so that the nest block has the function of positioning the panel parts before flange molding, but the flange after molding is nested. Since it does not interfere with the block, it is possible to improve the shape accuracy of the panel component while ensuring the ease of taking out the panel component after flange molding.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention, which is a sectional view immediately after flange forming is completed, FIG. 2 is a perspective view of a panel part before flange forming, and FIG. 3 is a panel part before flange forming. Sectional view showing a state of being positioned on the mold, FIG. 4 is a sectional view showing a state in which the panel component after flange molding is horizontally moved on the lower mold, and FIG. 5 is a perspective view of the panel component after flange molding, 6 (A), (B), and (C) are a- of FIG.
Sectional views taken along lines a, bb, and cc, FIG. 7 is a sectional view of a conventional press die for forming a flange, and FIG.
FIG. 9 is a plan view of the lower mold of the figure, FIG. 9 is a sectional view of the flange lifter in FIG. 8, FIG. 10 is a sectional view taken along the line D-D of FIG. 8, and FIGS. It is a principal part sectional view for demonstrating the malfunction by a molding method. 1 ... Upper die, 5 ... Punch as lower die, 7 ... Slide cam, 8 ... Sectional die, 21,23 ... Cutting edge, 22
...... Cut blade block, 25 …… Nest block, 27 …… Arm, F ₁ , F ₂ , F ₃ …… Flange part, P …… Outer hood panel as a panel component, S …… Excessive tongue part.

Claims (1)

(57) [Claims] 1. A slide cam driven by the upper and lower dies after the trimmed panel parts are positioned by contacting the ends of the panel parts with a nest block on the lower mold side. By advancing from a direction inclined by a predetermined angle with respect to the pressure restraining direction, and bending the flange portion at the end of the panel component by the cooperation of the slide cam and the lower die, and the panel having the flange portion bent. A method of horizontally moving a panel part to avoid interference between the flange part and the lower mold when the part is taken out above the lower mold. The local excessive tongue piece that is directed diagonally downward in the state of pressure restraint by is formed integrally in advance, and the end surface of the excessive tongue piece is vertically arranged on the vertically movable nest block provided on the lower mold side. Vertical When the flange part is bent by the slide cam and the lower die, the nest block is pushed down according to the forward displacement of the slide cam. While simultaneously including the step of cutting and removing the excess tongue portion by the shearing action of the cutting blades provided on the slide cam and the lower die, it is possible to avoid the interference between the flange portion after the flange molding and the lower die. The horizontal movement amount of the panel parts required for
When the horizontal distance between the vertical wall surface of the nest block and the lower die with which the tip surface of the surplus tongue portion abuts and the panel component after flange molding can be moved horizontally is l2,
A method for processing a flange of a panel component, wherein the protruding length of the excess tongue portion is set to a length that satisfies the relationship of l2> l1.