JPH054896Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mold device, and more specifically, when bending a workpiece using a set of dies, a bending punch is attached to one of the dies. by attaching a dowel to the other die, and displacing the two dies relatively, the bending punch and the dowel work together to essentially bend the work into a substantially triangular cross-section. This invention relates to a mold device for bending.

[Prior Art] Conventionally, as a method for bending the edges of steel materials such as automobile bonnets, doors, and trunk covers, flat hemming involves folding the edges of steel materials that have been previously bent at 90 degrees in half until they touch each other. Generally, methods such as looped hemming, in which the edges of the steel material are rounded and bent, are used.

However, in the flat hemming, the edges of the steel material are completely crushed, causing distortions and cracks in the edges, which often impairs the aesthetic appearance. In addition, in loop hemming, the edges of the member are rounded and bent, so the aesthetic appearance is not impaired, but there are problems such as the bending line is not clear.

Therefore, the bending process is done by so-called delta hemming, in which the cross section becomes substantially triangular in order to minimize the distortion that occurs at the edges and have an excellent appearance, as well as to obtain sharp bending lines at the edges. devised.

This delta hemming involves bending a steel material that has been previously bent at 90° into a substantially U-shape using a bending punch, and then shaping the edge into a substantially triangular cross-section with a flange and a convex portion for crimping the steel material. This is achieved by bending it.

Here, this delta hemming requires a process of forming the convex part and a process of forming the flange part, and therefore, the edge bending process is essentially divided into two processes: temporary bending and final bending. must be carried out. In the end, delta hemming makes the work complicated and takes a long time, which makes it virtually difficult to improve efficiency. In addition, work hardening often occurs in the member that has been temporarily bent in the first step to form the convex portion, and this may cause work hardening to occur in the second step to form the flange portion. There is a concern that it will be difficult to perform the final bending accurately.

[Purpose of the invention] The present invention has been made in view of the above, and includes a swingable first yoke having a punch for bending a workpiece attached to a first mold, and 2
A second yoke provided with a stop that contacts the workpiece and works together with the punch is attached to the mold, and the first and second yokes are rocked by displacing the first mold or the second mold. By hemming the workpiece into a substantially triangular cross-section during use, it has an excellent appearance and a clear bending line, while also preventing the occurrence of work hardening and making it possible to efficiently bend the workpiece. The purpose is to provide a mold device for

[Means for Achieving the Object] In order to achieve the above-mentioned object, the present invention includes a first yoke equipped with a punch for bending a workpiece, which is swingably disposed in one of the molds. A second yoke with a stopper attached to the other mold is swingably provided,
After fixing the workpiece to the one mold, the second yoke is displaced to position the stopper on the workpiece, and then the first yoke is swung to interact with the stopper through the punch. 1. Cut the workpiece into the specified shape.
Next, the second yoke is oscillated to separate the metal from the first bent workpiece, and the first yoke is further oscillated and the workpiece is secondly bent using a punch. The present invention is characterized in that the workpiece is substantially bemmed to have a substantially triangular cross section.

Further, the present invention is characterized in that the other mold is provided with a first cam means for swinging the first yoke and a second cam means for swinging the second yoke.

[Embodiments] Next, preferred embodiments of the mold device according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a mold device according to the present invention, and the mold device 10 includes a lower mold 12.
and an upper mold 14 disposed above the lower mold 12. A bending die 16 is erected on the lower mold 12, and a horizontal surface 18 and a vertical surface 20 are formed on the upper part of the bending die 16. On the other hand, a protrusion 17 having a hemispherical upper part is provided on one end side of the lower die 12.

A stopper 22 is provided adjacent to the bending die 16, and a support base 24 is provided near the stopper 22.
will be placed. This support stand 24 has a hinge member 2
6 is provided, and a first yoke 28 is attached via this hinge member 26 so as to be swingable in the directions of arrows A ₁ and A ₂ . The first yoke 28 has a cam roller 30 at one end thereof, and a bending punch 32 is attached to the other end. The tip of the bending punch 32 forms a bent portion 32a having an inclined surface. A tension coil spring 36 is interposed between the first yoke 28 and the protrusion 17. Therefore, the first
It will be easily understood that the yoke 28 is always pulled in the direction of arrow _A1 .

Further, a stopper 35 is provided close to the support base 24 of the lower die 12 so as to come into contact with the first yoke 28, and this stopper 35 prevents the first yoke 28 from rotating more than necessary.

On the other hand, the upper mold 14 includes a cam die 38 and an upper die 40, and the cam die 38 is attached to the upper die 40 via a mounting plate 42. A first cam 44 is fixed to the tip of the cam die 38 using a recess. The first cam 44 has inclined surfaces 46a and 46b.
and a vertical surface 46c. Furthermore, a second cam 50 is fixed to the upper part of the cam die 38, and this second cam 50 has a substantially trapezoidal shape and has a vertical surface 50a and curved surfaces 50b and 50c.

The upper die 40 also has a concave portion 52 directed downward.
is provided, and a protrusion 54 extends vertically downward in the vicinity thereof. Therefore, the upper die 40
A space portion 57 is defined by a portion of the projection portion 54, the protrusion portion 54, and the cam die 38. A support base 58 is provided on the protrusion 54 so as to protrude into the space 57, and a yoke mounting base 6 is mounted on the support base 58.
4 is held via a hanging bolt 66. A coil spring 58 is mounted on the hanging bolt 66 and constantly presses the yoke mounting base 64 downward.

A stopper 69 is fixed to the lower surface of the yoke mount 64, and a second yoke 72 is attached to the yoke mount 64 via a hinge member 70 as shown by arrow B ₁ ,
B It is attached so that it can swing freely in _two directions. Said second
A stopper plate 74 is fixed to one end of the yoke 72, and a stopper 76 is further attached to the stopper plate 74. As can be understood from the figure, the tip of the stopper 76 has a bent portion 76a, and furthermore, the tip forms an inclined flank. The other end of the second yoke 72 protrudes upward, and a roller 78 is rotatably disposed on the protrusion. This roller 78 can roll on the curved surfaces 50b, 50c and the vertical surface 50a of the second cam 50, and this rolling action causes the second yoke 72 to be displaced in the directions of arrows _B1 and _B2 .
A coil spring 82 is interposed between the second yoke 72 and the yoke mounting base 64, the second yoke 72 is pulled under the action of the coil spring 82, and the roller 78 is connected to the curved surface 50b of the second cam 50.
and 50c, pressed against the vertical surface 50a.

The mold device according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

First, an outer panel member 84 bent into a substantially L-shape is placed so as to contact the horizontal surface 18 and the vertical surface 20 formed on the bending die 16, and an inner panel is placed on the upper surface of this outer panel member 84. Place the member 86. next,
Drive the cylinder (not shown) to move the upper mold 14 with the arrow
C Lower in _one direction. In this way, when the upper die 14 descends, the cam roller 30 disposed on the first yoke 28 first moves against the inclined surface 46 of the first cam 44.
a. At the same time, the stopper 22 provided on the lower mold 12 and the stopper 69 provided on the yoke mounting base 64 come into contact. Further, by lowering the upper mold 14, the roller 78 provided on the second yoke 72 rolls from the curved portion 50b of the second cam 50 to the vertical surface 50a, and the stopper 76 is displaced in the direction of arrow _B1 . and is positioned on the inner plate member 86.
At this time, the bent portion 76a faces the bent portion of the outer panel member 84.

When the cam roller 30 contacts the inclined surface 46a, the bending portion 32a of the bending punch 32 contacts the outer plate member 84, and further, as the cam roller 30 rolls on the inclined surface 46a of the first cam 44, the first yoke At 28, the outer plate member 84 is bent into a substantially U-shape along the bent portion 76a of the stopper 76, thereby performing the first bending (see FIGS. 2a and 2b).
Furthermore, when the upper mold 14 descends, the cam roller 30 comes into contact with the inclined surface 46b, and accordingly, the roller 78 is located on the curved surface 50c of the second cam 50. At this time, the stopper 76 is displaced in the direction of arrow _B2 by the tensile force of the coil spring 82 and retracted from the inner plate member 86 (see FIGS. 3a and 3b). When the stopper 76 is retracted, the outer plate member 84 is hemmed by the bending punch 32 to form a convex portion 88 on the inner plate member 86 side.

Furthermore, when the cam roller 30 rolls on the vertical surface 46c of the first cam 44, the bending punch 32 is further displaced in the direction of arrow _A1 , forming a flange portion 90 on the outer plate member 84 along the inner plate member 86. The second bending is performed, and the delta hemming process is completed by the above-mentioned first bending and this second bending (Fig. 4a,
b).

On the other hand, when opening the mold, a cylinder (not shown) is driven to raise the upper mold 14 in the direction of arrow _C2 . At this time, the cam roller 30 rolls on the inclined surface 46b and the inclined surface 46a in the opposite direction to that described above, whereby the bending punch 32 is displaced in the direction of arrow _A2 and separated from the outer plate member 84.

That is, when the cam roller 30 rolls on the first cam 44, the first yoke 28
Due to the tensile force of 6, the stopper 35 is brought into contact with the stopper 35 (the state shown in FIG. 1).

[Effect of the invention] In this case, according to this embodiment, the convex portion of the outer panel member can be bent at an obtuse angle at the bending point P without being completely folded in half. Therefore, it is possible to prevent distortion caused by the bending process. Furthermore, since it is possible to form sharp bending lines, it is possible to form edges that are excellent in appearance. Furthermore, since this delta hemming can be performed in one step, it is possible to achieve the effect of shortening the working time.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to this embodiment. For example, the first yoke and the second cam may be replaced with the first cam and the second cam, respectively. Of course, various improvements and changes in design are possible without departing from the gist of the present invention, such as the possibility of incorporating an actuator for swinging the yoke.

[Brief explanation of the drawing]

1, 2a, 3a, and 4a are partially omitted vertical sectional explanatory views of the mold device according to the present invention, and FIGS. 2b, 3b, and 4b are the main FIG. 2 is an enlarged view of the main parts of the mold device according to the invention. 10... Mold device, 12... Lower die, 14... Upper die, 28... First yoke, 32... Bending punch,
44...first cam, 50...second cam, 72...
2nd yoke, 76...Treasury.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A first yoke equipped with a punch for bending a workpiece is swingably disposed on one of the molds,
A second yoke with a stopper attached to the other mold is swingably provided, and after fixing the workpiece to the one mold, the second yoke is displaced to position the stopper on the workpiece, and then, The first yoke is oscillated to first bend the workpiece into a predetermined shape through the punch in cooperation with the stopper, and the second yoke is once oscillated to first bend the workpiece. The workpiece is separated from the bent workpiece, further swings the first yoke, and secondly bends the workpiece with a punch, thereby substantially hemming the workpiece into a substantially triangular cross section. Mold equipment. (2) In the apparatus according to claim 1, the other mold is provided with a first cam means for swinging the first yoke and a second cam means for swinging the second yoke. A mold device featuring: