JP2866629B2 - Thin plate mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin plate forming die.

[0002]

2. Description of the Related Art Negative angle forming of a thin plate such as a sheet metal or a plastic is usually performed using a slide cam. by the way,
Negative angle molding here means that when the workpiece placed on the lower mold is formed by abutting the lower upper mold in the vertical direction to form the abutment, the work has a forming part that enters the lower mold from the processing locus of the upper mold. Say molding.

In the conventional negative angle forming of a thin plate product, a work is placed on a lower die, the upper die is lowered vertically downward, and the lower die passive cam is driven by the upper die working cam. Was processed from the lateral direction, and when the processing was completed and the upper die was raised, the passive cam was retracted by a spring. In this case, the forming part of the passive cam that forms the work by sliding from the lateral side outward of the work is formed in the same integral shape as the shape of the forming part of the work, but the lower mold on which the work is mounted is formed. Since the workpiece must be removed from the lower mold after the work is completed, the part of the lower mold that becomes a negative angle is divided and retracted, or the rear part of the negative angle is deleted and the work is moved forward. It must be moved so that the workpiece can be taken out.
This is not a problem when the degree of the negative angle is slight, but when the degree of the negative angle is large or when the work has an elongated frame-shaped cross section, for example, parts such as the front pillar outer of sheet metal parts for automobiles In this case, because the width of the groove of the work is narrow, if the lower mold part that becomes a negative angle is divided or removed, not only the shape cannot be clearly formed at the molding part of the passive cam, but also the strength of the lower mold becomes insufficient. Negative angle forming was not possible.

[0004] Further, in the negative angle forming by the slide cam,
Since the passive cam is formed by sliding over a considerably long linear distance, it is not always easy to repeatedly slide the passive cam to a predetermined position accurately, and it is difficult to produce a stable quality product. In addition, the product may be twisted or distorted, and the product may need to be modified.However, the outer panels of the car, such as the side panel, front fender, roof, hood, trunk lid, door panel, and front pillar outer, are configured. Such a part has a three-dimensional curved surface / curve, and it is practically impossible to modify the product. In the case of sheet metal assembly of automobiles, if the product is twisted or distorted, it is difficult to combine with other parts and it is not possible to provide a high quality automobile sheet metal structure, and it is possible to maintain the predetermined product precision of thin sheet molded products could not.

When a slide cam is used, a large passive cam or heel is provided on the side on which the work of the lower die is placed, so that the area of the lower die is increased, and the weight of the die is increased and the expensive metal is expensive. Had become a type. Therefore, in order to solve the above problems, a method of forming a thin plate for converting a linear motion in the vertical direction of a press into a rotary motion and a forming die thereof have already been proposed by the present applicant as Japanese Patent Publication No. 63-41662. I have.

First, the molding die will be described in detail with reference to FIGS. FIG. 6 is a schematic left and right perspective view of a completed front pillar outer product which is a sheet metal part of an automobile formed by the molding die. In the figure, the lower part is for right and the upper part is for left. This front pillar outer is part of the front door frame and part of the windshield frame,
In addition, it is also a part of the frame that supports the roof panel, has a connection part with many parts, and is a product that requires strict product accuracy, and if the accuracy is not satisfied, good quality We will not be able to provide sheet metal bodies.

The front pillar outer has a three-dimensional curved surface / curve to constitute an outer plate portion of an automobile. The portion formed by the negative mold with the negative mold is a portion indicated by F, and its cross section is shown as a workpiece W in FIG. That is, the state shown in FIG. 10 is obtained after forming the negative angle from the state of the work W shown in FIG.
Incidentally, in this press working step, first, drawing processing is performed, then, outer peripheral trimming processing is performed in the state shown in FIG. 7, and there is a main forming step as the third step thereafter.

The lower die 100 has a cylindrical rotary cam 102 in which a groove 101 is formed in the axial direction and is rotatably provided on a lower die body 103. The lower die body 103 is fixed on the lower substrate 121 by bolts 122. The upper surface of the lower die body 103 is formed in a shape that allows the work W to be placed thereon, and the negative angle forming portion 10 is formed on the edge of the groove 101 of the rotary cam 102 near the upper surface of the lower die 103.
4 is formed. After the work W has been formed, an automatic return device 105 for rotating and retracting the rotating cam 102 is embedded in the lower mold body 103 so that the work W can be taken out from the lower mold body 103. In this example, the automatic return device 105 is a coil spring 106
The push pin 107 urged in the direction shown in FIG.
The rotating plate 108 is brought into contact with the lower surface of the distal end fixed at 51.

The automatic return device can use a pneumatic device, a hydraulic device, a link mechanism, a cam, or a mechanism similar thereto, and can be provided not only between the lower mold but also between the upper and lower molds. On the other hand, the upper die 109 has the rotary cam 10.
The slide cam 110 is provided at a position opposed to the slide cam 110. The slide cam 110 forms a negative angle forming portion 112 at a lower end, and the slide cam 110 is guided by a guide (not shown). The slide cam 110 is fixed to the upper surface of the slide cam 110 and the upper substrate 152 by a bolt 153. Coil spring 11 contracted between guide 154 and lower surface
7 urges the mold outward. Slide cam 11
0 is stopped by a stop plate 156 fixed to the inclined guide 154 by bolts 155. The pad 157 is urged downward by a coil spring 158 and the suspension bolt 119
As a result, the work W is strongly pressed against the lower die body 103 so that the work W does not move before the work W is formed at a negative angle.

Next, the operation of the mold will be described.
First, as shown in FIG. 7, the upper mold 109 is located at the top dead center, and at this time, the work W
Is placed. At this time, the rotating cam 102 has been rotated backward by the automatic return device 105. Next, as shown in FIG. 8, first, the upper die 109 starts to descend, and the slide cam 110 does not interfere with the negative angle forming portion 104 of the rotary cam 102, and the lower surface of the slide cam 110 The rotation cam 102 is rotated clockwise in FIG.

When the upper die 109 continues to descend, the slide cam 110 urged outwardly of the die moves laterally leftward by the action of the cam against the urging force of the coil spring 117. Then, the state shown in FIG. 9 is obtained, and the negative angle forming section 104 of the rotating rotary cam 102 and the negative angle forming section 112 of the slide cam 110 form the workpiece W at the negative angle.

After the negative angle forming, the upper mold 109 starts to rise.
The slide cam 110 is urged outward from the mold by a coil spring 117, moves rightward in FIG. 10, and rises without interfering with the workpiece W formed with a negative angle. On the other hand, the rotating cam 102 is rotated leftward in FIG. 10 by the automatic return device 105 because the restricted slide cam 110 is lifted, and when the workpiece W is taken out from the lower die 103 of the negative angle formed workpiece, W is the rotating cam 102
Can be taken out without interfering with the negative angle forming portion 104.

[0013]

As described above, the negative angle forming of a thin sheet product is performed using the rotating cam.
Since the rotating cam rotates around the rotation axis to machine the work, the workpiece can be machined by inserting a negative angle forming part into one rotating cam unless the work is substantially linear and largely bent when viewed from the working direction. However, when the workpiece is bent significantly, the negative angle forming portion cannot be accommodated in one rotating cam, and thus the processing cannot be performed.

In particular, sheet metal parts of automobiles have many bent parts such as door panels, and in recent years, there are many bent parts, and in addition, there are many negative angle forming parts due to design reasons. There is a demand for improving the production efficiency by enabling molding in one step without using many steps.

[0015]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a method of forming a large bent negative angle forming portion using a plurality of parallel rotating cams having different rotation shaft positions. It is a thin plate mold. The size of the diameter of the rotating cam cannot be increased excessively from the viewpoint of manufacturing the mold, and is, for example, about 320 mm. Is provided. According to the degree of bending, another rotating cam is displaced in the vertical and horizontal directions. The division position of the rotary cam is considered so that the negative angle forming portion does not become too acute. If the angle is acute, the strength is insufficient.

Further, since the plurality of rotating cams of the present invention are arranged so that their rotating shafts are parallel to each other, when the rotating cams rotate, their end faces interfere with each other at the joint of the adjacent rotating cams. There is nothing to do. Further, an interlocking mechanism can be provided for the adjacent rotating cams of the present invention, and the driving of the rotating cams can be performed by one automatic return device.

Furthermore, in the present invention, the engagement plate and the pin are engaged as an interlocking mechanism, which is an extremely simple configuration.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on a specific embodiment shown in FIGS. The work W to be molded by the molding die of the present invention is a trunk lid outer of an automobile, as shown in FIG. 1, in which a concave arc-shaped curved portion in a plan view of a front edge portion of the trunk lid outer is formed at a negative angle. As shown in FIG. 2, the negative angle is formed from the upper cross section to the lower cross section.

FIG. 1 is a plan view of a forming die of the present thin plate, FIG. 2 is a view showing a state of a flange 1 before and after forming a work W, and FIG.
FIG. 4 shows an I-III longitudinal sectional view, FIG. 4 shows an IV-IV longitudinal sectional view of FIG. 1, and FIG. Work W of this thin mold
The processed part is the front edge of the trunk lid outer, which is concave in plan view as can be seen from FIG. 1, and both ends are displaced considerably downward from the center and to the right as seen in FIG. doing. In order to work with one rotating cam, a very large rotating cam must be used. In making the mold, it is practically impossible to make it unnecessarily large,
The maximum diameter is about 320 mm. In addition, there are cases where the flange angle is different between the center portion and both end portions, and the negative angle forming portion of the rotating cam becomes too acute to maintain the strength. In the present invention, the rotating cam is divided into three parts, a central part and both end parts, and the rotating cam is provided with an interlocking mechanism so that one sliding cam drives all the rotating cams.

The both ends of the center rotating cam 2 of the rotating shaft C _A in FIG. 1, to place the end rotary cam 3 of the rotating shaft C _B, respectively. As can be seen from FIG. 4, the end rotation cam 3 is displaced by H below the center rotation cam 2 and by L to the right. Lower mold 4
As shown in FIG. 3, a support block 7 is fixed to a lower mold base 5 with bolts 6, and a groove 14 is formed in a horizontal hole groove 8 in the center of the upper surface of the support block 7 in an axial direction. The column-shaped central rotating cam 2 is rotatably supported.

In this embodiment, an air cylinder 12 is provided as an automatic return device for the rotating cam. Needless to say, the automatic return device is not limited to an air cylinder, but may be a spring, a hydraulic device, a link mechanism, a cam or a mechanism similar thereto, and may be provided not only in a lower die but also in a vertical die. In FIG. 3, a connecting member 9 is fixed to the lower surface of the center rotary cam 2 with bolts 10, and the bracket 11 is fixed to the support block 7 with bolts 15.
The connecting member 9 is pivotally connected to the distal end of the piston rod 13 of the air cylinder 12 with the base end pivotally connected thereto, and the piston rod 13 is contracted so that the central rotary cam 2 returns. A connecting member 9 is provided at the bottom of the hole 9 of the support block 7.
Is provided with a window hole 16 that allows swinging of the shutter.

A negative angle forming portion 17 is formed at the edge of the groove 14 of the central rotary cam 2, and a rotating plate 72 is fixed to the groove 14 at a side facing the negative angle forming portion 17 by bolts 73. . In FIG. 1, the rotating plate 72 is omitted. Further, the negative angle forming portion 17 of the center rotary cam 2 is formed on a work mounting portion 18 having the same shape as the lower surface of the work W so that the work W can be mounted thereon. A work supporting portion 19 having the same shape as the lower surface of the work W is formed near the upper outside connected to the portion 18.

The upper die 21 has a support block 23 fixed to the lower surface of the upper die base 22 with bolts 24, a wear plate 25 fixed to the lower surface of the support block 23 with bolts 26, and a slide cam on the lower surface of the wear plate 25. 27 to guide plate 2
8 and slide. A negative angle forming portion 34 is provided at a position facing the groove 14 of the center rotating cam 2 at the tip of the slide cam 27.
Are fixed with bolts 35.

A receiving plate 29 is fixed to the upper surface of the slide cam 27 with bolts 30.
The coil spring 31 is compressed between the third vertical wall 24 and the slide cam 27 to bias the slide cam 27 toward the outside of the mold. Further, the coil spring 31 is externally mounted on a positioning pin 32 screwed to the vertical wall 24, and a tip end of the positioning pin 32 penetrates a stop plate 33 fixed to a side surface facing the vertical wall 24. It is. When the upper mold 21 rises,
The receiving plate 29 is stopped by the urging force of the coil spring 31.
The slide cam 27 moves outwardly of the mold until the slide cam 27 comes into contact with the mold 3.

Although not shown, the work W
In order to stably support the work W, a positioning member for the work W is provided on the lower mold 4, and the upper mold 21 is provided with a pad for pressing the work W on the lower mold 4 as described in the conventional example. , Because it becomes complicated and it becomes difficult to understand the main part of the present invention,
The positioning member and the pad are omitted. Next, work W
4 will be described with reference to FIG.

An end support block 41 is fixed to the lower die base 5 with bolts 42, and a groove 44 is formed in a horizontal hole groove 43 at the center of the upper surface of the end support block 41 in the axial direction. The columnar end rotation cam 3 is rotatably supported. A negative angle forming portion 45 is formed at the edge of the groove 44 of the end rotary cam 3, and a rotating plate 46 is fixed to the groove 44 on a side facing the negative angle forming portion 45 by a bolt 47. In FIG. 1, the rotation plate 46 is omitted. The negative angle forming portion 45 of the end cam 3 is formed on a work mounting portion 48 having the same shape as the lower surface of the work W so that the work W can be mounted thereon. A work supporting portion 49 having the same shape as the lower surface of the work W is formed near the upper outside connected to the work mounting portion 48.

In FIG. 4, the same parts as those in FIG. 3 of the upper die 21 are denoted by the same reference numerals, and they perform the same functions. A negative angle forming portion 50 is fixed to a portion of the slide cam 27 facing the groove 44 of the end rotation cam 3 with a bolt 51. In FIG. 4, similarly to FIG.
Although pads are provided on the positioning member 21 and the upper mold 21 respectively, they are omitted.

FIG. 5 shows an interlocking mechanism for transmitting the rotating power transmitted to the center rotary cam 2 by the air cylinder 12 to the adjacent end rotary cams 3 on both sides. An engaging plate 62 provided with a notch groove 61 is fixed to an end surface of the central rotating cam 2 with a bolt 63, and an end rotating cam on an end surface of the engaging plate 62 on the end surface of the central rotating cam 2 facing the notch groove 61. The pin 64 is fixed to the position 3 with a bolt 65.

When the center rotary cam 2 is driven by the air cylinder 12, the end rotary cam 3 rotates simultaneously in the same direction because the pin 65 is engaged with the engagement plate 62. In addition,
The end rotation cam can be driven by an air cylinder to drive the center rotation cam. Furthermore, although an example of three rotating cams is described, four or more rotating cams can be driven by one air cylinder via an interlocking mechanism.

Next, the operation of the mold for forming the present thin plate will be described. Each of the states shown in FIGS. 3 and 4 shows a state at the bottom dead center, and corresponds to FIG. 9 of the conventional example. Although not shown in the present invention, as shown in FIG. 7 of the conventional example, the upper die 21 is located at the top dead center. At that time, the work W is placed on the work supporting portions 19 and 49 of the lower die 4. At this time, the center rotary cam 2 and the end rotary cam 3 have been rotated and retracted by the air cylinder 12.

Next, as shown in FIG. 8 of a conventional example, the upper die 21 firstly slides the cam 27 into the center rotation cam 2.
The inclined surface 71 of the slide cam 27 is rotated without interfering with the negative angle forming portions 17 and 45 of the end rotary cam 3.
The central rotation cam 2 and the end rotation cam 3 are rotated clockwise. When the upper mold 21 continues to descend, the slide cam 27 urged in the outward direction of the mold moves leftward in the lateral direction by the action of the cam against the urging force of the coil spring 31. The state shown in FIG. 9, that is, the state shown in FIGS.
The work W is formed with the negative angle forming portions 17 and 45 of the end rotation cam 3 and the negative angle forming portions 34 and 50 of the slide cam 27.

After the negative angle forming, the upper mold 21 starts to rise. The slide cam 27 is urged outward from the mold by a coil spring 31 and moves rightward and rises without interfering with the negative-angle-formed workpiece W, as shown in FIG. On the other hand, when the constrained slide cam 27 rises and the air cylinder 12 contracts the piston rod 13, the center rotating cam 2 and the end rotating cam 3 rotate rightward and move below the workpiece W formed with the negative angle. When the work W is taken out from the mold 41, the work W can be taken out without interfering with the negative angle forming portions 17 and 45 of the center rotating cam 2 and the end rotating cam 3.

In the present invention, in order to take out the workpiece W without interfering with the lower mold, when the center rotary cam 2 is rotated by the air cylinder 12, the separate end rotary cams disposed on both sides are rotated accordingly. 3 is turned back. A plurality of rotating cams can be operated by one air cylinder with an interlocking mechanism interposed.

[0034]

According to the present invention, as described above, the first type has the second type.
A molding die having a molding portion that forms a negative angle when the mold is moved in a linear direction to form an abutment, wherein a cylindrical rotary cam having a groove formed in an axial direction is rotatable to the first mold. And forming a negative angle forming portion at the groove edge of the rotating cam, and providing a slide cam having the negative angle forming portion in the second mold so as to face the rotating cam until the workpiece can be removed from the first mold after forming. In a thin plate forming die provided with an automatic return device for rotating and retracting a rotary cam in a first die, a thin bent plate in which a large bent negative angle forming portion is processed by a plurality of parallel rotary cams having different rotation shaft positions. Since it is a molding die, it is possible to perform molding of a large bent negative angle molding portion with one molding die, so that the number of steps can be reduced and the processing accuracy can be improved.

Further, since the negative angle forming portion which is greatly bent is divided into a plurality of portions, it is possible to take care that the negative angle forming portion of the rotating cam does not become too sharp, and the rotating cam may have insufficient strength. Absent. Furthermore, in the present invention, since a plurality of rotating cams are arranged so that their rotating axes are parallel to each other, when the rotating cams rotate, the end faces of the rotating cams may interfere with each other at the joint of the adjacent rotating cams. Never.

Further, an interlocking mechanism may be provided for the adjacent rotating cams of the present invention, and the driving of the rotating cams may be performed by one automatic return device. Furthermore, in the present invention, the engagement plate and the pin are engaged as an interlocking mechanism, so that an extremely simple configuration can be achieved.

[Brief description of the drawings]

FIG. 1 is a plan view of a specific embodiment of the present invention.

FIG. 2 is a two-sided view of a cross section before and after the negative angle forming of the work of a III-III part in FIG. 1;

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

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

FIG. 5 is a two-sided view showing an interlocking mechanism of the present invention.

FIG. 6 is a schematic left and right perspective view of a completed product of a front pillar outer, which is a sheet metal part of an automobile.

7 is a longitudinal sectional view showing a state in which an upper die of a molding die for molding the front pillar outer of FIG. 6 at a negative angle is at a top dead center.

8 is a longitudinal sectional view showing a state where the upper mold of FIG. 7 descends and comes into contact with the lower mold.

FIG. 9 is a longitudinal sectional view showing a state where the upper die of FIG. 7 is at a bottom dead center.

FIG. 10 is a vertical cross-sectional view showing a state in which the molding die of FIG. 7 is formed at a negative angle and the upper die is raised to a top dead center.

[Explanation of symbols]

 W ... Work 1 ... Flange 2 ... Central rotating waste 3 ... End rotating cam 4 ... Lower die 21 ... Upper die 27 ... Slide cam 62 ... Locking plate 65 ... Pin

Claims (3)

(57) [Claims] 1. A molding die having a molding part having a negative angle when a second die is moved in a linear direction to a first die to form an abutment, and has a cylindrical shape having a groove formed in an axial direction. Rotating cam 1
A negative angle forming portion is formed on the groove edge of the rotating cam, and a slide cam having the negative angle forming portion is provided on the second die so as to face the rotating cam, and the formed work is formed on the first die. In a thin-plate forming die provided with an automatic return device that rotates and retracts the rotating cam until it can be removed from the die, a large bent negative angle forming part is machined with a plurality of parallel rotating cams with different rotation shaft positions. A thin plate forming die. 2. The thin plate forming die according to claim 1, wherein an interlocking mechanism is provided for the plurality of rotating cams, and the plurality of rotating cams are driven by one automatic return device. 3. The thin plate forming die according to claim 2, wherein the interlocking mechanism has an engaging plate provided on one of the opposed end surfaces of the adjacent rotating cams and a pin provided on the other, and the engaging plate and the pin are engaged.