JP2821997B2 - Bend type device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bend-type device for forming a flange bent toward the inner surface of a work on both sides of a panel-like work such as a front fender of an automobile.

[0002]

2. Description of the Related Art Conventionally, in this type of bend-type device, a first receiving die that supports a portion on one side edge of a work;
A second receiving mold that supports a portion on the other side edge side of the work is arranged at an interval in the horizontal direction, the work is supported by the two receiving molds in a horizontal posture, and a bend edge of an outer edge of the first receiving mold is formed. Flanges are formed on both side edges of the workpiece by the cooperating first punch and the cooperating second punch with the outer bend edge of the second receiving die.

Here, when flanges are formed on both side edges of the work, each flange engages with the undercut portion of the bend edge of each receiving mold, and the work cannot be pushed upward as it is. Showa 6
As shown in JP-A-2-131731, a collab scum that is movable in the horizontal direction is provided, and one of the two receiving molds, for example, a second receiving mold is fixed to the collab scum, and a second punch is attached to the second receiving mold. The collab scum is moved to the first receiving mold side in a state where the second punch is separated from the second receiving mold after the flange is formed. The mold is released, and then the workpiece is pushed together with the collab scum by abutment of the second punch on the outer surface of the flange to release the flange on one side edge of the workpiece from the first receiving mold. The work is pushed up by the ejector arranged between the receiving die.

[0004]

SUMMARY OF THE INVENTION In the above prior art,
Since the intermediate portion of the work is not supported by the receiving mold, deformation may occur in the intermediate portion of the work when forming the flange, and the flange on one side edge of the work may bite against the bend edge of the first receiving mold. When detaching from the first receiving mold against the force, the flange on the other side edge of the work farthest from the flange is pressed, so that the work may be overloaded and the work may be deformed. SUMMARY OF THE INVENTION In view of the foregoing, an object of the present invention is to provide a bend-type apparatus that can perform flange forming and mold release of a formed workpiece without causing deformation of the workpiece.

[0005]

In order to achieve the above object,
The present invention relates to a bend-type device for forming a flange bent on the inner surface side of a work on both side edges of a panel-like work, wherein the inner surface of the work is turned from one side edge to the other side edge of the work with the inner surface facing downward. A receiving mold having a receiving surface for supporting the same and bend edges on both sides, wherein one of the bend edges has a substantially horizontal undercut portion and the receiving surface has a rising portion rising from the one bend edge. A first punch that cooperates with a bend edge on one side to bend the flange on one side of the work substantially horizontally, and a cooperates with a bend edge on the other side to bend the flange on the other side of the work. A second die having a receiving surface extending from a dividing line in the middle of the rising portion to a bend edge on one side, and a receiving surface extending from the dividing line to a bend edge on the other side. Having The first mold part and the second mold part are relatively movable in the horizontal direction, and the receiving mold is formed by the receiving surface of the first mold part and the receiving surface of the second mold part. It is characterized in that it can be switched between a continuous widened state and a narrowed state in which the second mold part protrudes above the first mold part.

[0006]

With the receiving die widened, the first and second punches are operated to bend flanges on both side edges of the work. In this case, since the work is supported by the receiving mold from one side edge to the other side edge, no deformation occurs in the intermediate portion of the work.

After the flange is formed, the receiving die is brought into a reduced width state. According to this, the second die portion of the receiving die protrudes above the first die portion, and the work is supported by the second die portion. By being pushed to one side, the flange on one side edge of the work is separated from the bend edge on one side of the receiving mold formed on the first mold part.
In this case, the work should be
The work is pressed to one side by the mold portion, so that the work is not forced.

When the flange on the other side edge of the work is bent and formed vertically, the work can be removed upward by setting the receiving mold in a reduced width state. In the case where the work is bent obliquely downward and inward, the work cannot be removed upward as it is because the flange is engaged with the bend edge on the other side of the receiving mold even if the receiving mold is in the reduced width state. Therefore, in this case, an ejector is provided on the second mold portion of the receiving mold to push up the work in a direction in which the flange on the other side is separated from the bend edge on the other side,
The work is taken out after the flange on the other side is separated from the bend edge on the other side by the operation of the ejector.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in the drawings, one side edge (upper edge when mounted on a vehicle body) and another side edge (lower edge when mounted on a vehicle body) of a front fender W of a vehicle, which is a panel-shaped work, are provided on the inner side of the work. The present invention is applied to a bend-type device for forming a bent flange. As shown in FIGS. 1 to 4, the bend-type device includes a lower holder 1 and an upper holder 2 that moves up and down. .

The lower holder 1 is provided with a receiving die 3 on which the front fender W can be set with its inner surface facing downward. The receiving mold 3 has a first bend edge 3a on one side for forming a flange on one side edge of the front fender W.
And a second bend edge 3b on the other side that forms a flange on the other side edge of the front fender W. The dividing line is set in the middle of the rising portion of the receiving surface with respect to the inner surface of the work, which rises from the first bend edge 3a. As a result, a first surface having a receiving surface 3c extending from the dividing line to the first bend edge 3a is obtained.
-Type unit 3 _1, it is divided into two from the division line to a second mold part 3 ₂ and having a receiving surface 3d reaching the second Bendoejji 3b.
Then, as the relatively movable first mold portion 3 ₁ and the second mold part 3 ₂ in the horizontal direction, the receiving die 3, the first mold part 3 ₁ of the receiving surface 3
c and with a second mold part 3 ₂ receiving surface 3d is continuously, so that the both receiving surface 3c, the inner surface of the front fender W by 3d is supported over the other side edge of the one side edge widening state and, second mold part 3 ₂ has to be switched on and width reduction state become pushed out above the first mold part 3 _1.

[0011] To this More specifically, in this embodiment, it is fixed to the first mold portion 3 ₁ to the lower holder 1, the second mold part 3 ₂
It is slidably supported by the lower holder 1 in the slider portion 4 extending outwardly of the integrally, the slider portion by the cylinder 5 as shown in FIG. 3 which is connected to a 4 second mold part 3 ₂ first
And adapted to move horizontally relative to the mold part 3 _1. The second mold part 3 ₂ receiving die 3 when moving the turns widening state outward end position the outer end of the slider portion 4 abuts against the stopper 1a projecting from the outer end of the lower holder 1, this receiving die 3 by moving the outer end position of the second mold part 3 ₂ inwardly was set to width reduction state.

Further, the lower holder 1, by positioning the first mold portion 3 ₁ of the outer, the provided first punch 6 freely advance inwardly against the non-illustrated spring, lowering the upper holder 2 the first punch 6 is advanced inwardly by being pushed by the cam 6a that vertically on the upper holder 2 when brought into, one side of the front fender W in cooperation with the first Bendoejji 3a of the first mold portion 3 ₁ The edge flange Wa was formed by bending. Here, the first bend edge 3
A substantially horizontal undercut portion is formed at a, and the flange Wa is bent substantially horizontally. The flange Wa has a bent edge Wa bent downward from the tip of the horizontal portion.
₁ is adapted to be integrally formed, the push rod 7 abuts the Orikyokuen Wa ₁ in the first mold portion 3 ₁ inserted, the receiving die 3 to the slider portion 4 when the width reduction state pressed push rod 7 movement, and so Orikyokuen Wa ₁ is pushed outward.

[0013] The second punch 8 for forming a flange Wb of the other side edge of the front fender W in cooperation with the second Bendoejji 3b which forms the second mold part 3 ₂ are provided on the holder 2. Here, a portion of the flange Wb on the other side edge, which is located at the wheel arch portion of the front fender W, is bent obliquely inward and downward, and therefore, the second bend edge 3b corresponding to the inner bent flange portion A beveled undercut portion is formed at the
The inner bent portion corresponding to the flange portion of the punch 8 constituted by the movable punch _81, the movable punch ₈₁ during the descent of the upper holder 2 by the cam ₈₁ a on the slider portion 4 inwardly towards the undercut portion To be pushed. The movable punch ₈₁ is urged outward by an unillustrated spring to the upper holder 2, further elastic member ₈₁ b to push back the movable punch ₈₁ on the slider portion 4 obliquely upward outwardly Provided, upper holder 2
Movable punch ₈₁ is to be smoothly disengaged from the undercut portion during the rise. Flange Wb on other side edge
The rest of the is adapted to be folded vertically downward, portion of the second punch 8 corresponding to this portion is composed of the fixed punch ₈₂ fixed to the upper holder 2.

[0014] The second mold part 3 _2, further by positioning the front and rear ends of the outer edge, the ejector 9 is infested obliquely on the outer side is provided by a cylinder 9a. The upper holder 2 is provided with a work holder (not shown) that elastically presses and holds the front fender W on the receiving mold 3, and further, when the upper holder 2 is lowered, a contact portion 4 a of the outer end of the slider portion 4. cam 10 for restraining the second mold part 3 ₂ outward end position engages is vertically on.

Next, a procedure for forming a flange by the apparatus of the above embodiment will be described. First, the front fender W is set with the receiving mold 3 in the widened state, and then the upper holder 2 is lowered. According to this, FIG. 5 and the first punch 6 is advanced toward the undercut portion of the horizontal first Bendoejji 3a formed in the first mold portion 3 ₁ as (a), the flange Wa of one side edge Is bent horizontally and the second
A second punch 8 is lowered towards the second Bendoejji 3b die portion 3 ₁ of the outer edge, the flange Wb of the other side edge is formed bent. In the portion shown in FIG. 5 advances the movable punch ₈₁ which constitutes a part of the second punch 8 toward the slant of the undercut portion of the second Bendoejji 3b, the inner bent flange portion Wb ₁ is molded However, in other portions, the flange Wb is bent and formed vertically.

[0016] At this time, the front fender W first mold portion 3 ₁ of the receiving surface 3c and the second mold part 3 ₂ receiving surface 3d is to one another successive
And is supported from one side edge to the other side edge,
Deformation does not occur even when receiving the forming load of the flanges Wa and Wb and the pressing force of the work holder.

Next, to raise the upper holder 2, then the receiving-type 3 by moving the second mold part 3 ₂ in the cylinder 5 inwardly width decreasing state. According to this, FIG. 5 second mold portion as shown in (b) 3 ₂ is protruding above the first mold part 3 _1, a front fender W is first mold portion remains supported by the second mold part 3 ₂ 3 ₁
Is pushed outward, and the flange Wa on one side edge is in the first position.
It separates from the bend edge 3a. In this case, the front fender W has the second rising portion near the flange Wa.
Since pushed outward by the die portion 3 _2, unreasonable can take is not the front fender W.

Next, by ejecting the ejector 9, the front fender W is moved to the second mold portion 3 as shown by a virtual line in FIG.
Pushed onto the _second slanted outward, disengaging the inner bent flange portion Wb ₁ from the second Bendoejji 3b. At this time, although the flange Wa of one side edge there is a引掛Ru potential to the first mold part 3 ₁ of the first Bendoejji 3a, the push rod 7 in the width reduction state of the receiving-type 3 lower outer of the first Bendoejji 3a projecting toward, the flange Wa is pushed outward in the bent edge Wa ₁ at the tip, a flange Wa is not hooking kick the first Bendoejji 3a.

[0019]

As is apparent from the above description, according to the present invention, the flange can be formed without causing deformation of the work, and the work can be removed from the work without excessive force. There is no deformation of the work.

[Brief description of the drawings]

FIG. 1 is a plan view of an example of the device of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a sectional view taken along the line IV-IV of FIG. 1;

FIG. 5A is a view showing a state of forming a flange, and FIG.
Diagram showing the work release state

[Explanation of symbols]

W Front fender (work) Wa, Wb
Flange 3 Receiving mold 3 ₁ First mold part 3 ₂
Second mold part 3a, 3b Bend edge 3
c, 3d receiving surface 6 first punch 8
2nd punch

Claims (2)

(57) [Claims] 1. A bend-type apparatus for forming flanges bent on both sides of a panel-shaped work toward the inner surface of the work.
A receiving mold having a receiving surface that supports the inner surface from one side edge to the other side edge of the work with the inner surface of the work facing downward, and bend edges on both sides, wherein the bend edge on one side is substantially horizontal. And an undercut portion having a rising portion whose receiving surface rises from one bend edge, and a first one in which a flange at one side edge of the work is bent substantially horizontally in cooperation with the one bend edge. A punch, and a second punch that bends and forms a flange on the other side edge of the work in cooperation with the bend edge on the other side, and moves the receiving mold from the dividing line in the middle of the rising portion to the bend edge on one side. A first mold portion having a receiving surface, and a second mold portion having a receiving surface extending from the dividing line to the bend edge on the other side;
The first mold part and the second mold part are relatively movable in the horizontal direction, and the receiving mold is in a widened state in which the receiving surface of the first mold part and the receiving surface of the second mold part are continuous. A bend-type device which is switchable to a reduced width state in which the first protrusion is protruded above the first mold portion. 2. The bend-type apparatus according to claim 1, wherein the second mold portion is provided with an ejector that pushes up the workpiece in a direction in which a flange on the other side edge separates from the bend edge on the other side.