JP2867016B2 - Bending 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 bending die comprising a pair of upper and lower dies. More specifically, a bending mold capable of reducing the number of steps required for a workpiece after bending, and thus realizing a reduction in the manufacturing cost of the workpiece. It will not be provided.

[0002]

2. Description of the Related Art The principle of a conventional folding die comprising a pair of upper and lower dies is shown in FIG. Here, FIG. 15 is a perspective view of a conventional bending die including a pair of upper and lower dies, and illustrates a die for bending a plate material to be processed at a right angle. I have.

In FIG. 15, a punch 101, which is an upper die for striking and bending a workpiece not shown in the drawing, is formed in a plate shape, and is brought into contact with the workpiece to strike. Is formed in a substantially V-shaped cross section.

The punch 101 thus configured is attached to a jig 104 mounted on a vertical moving mechanism of a bending machine (not shown) via bolts 103a and 103b, and moves in the vertical direction. .

On the other hand, the lower die 105 is formed in a columnar shape, and a groove portion 106 having a substantially V-shaped cross section is provided on the upper surface thereof. Then, when bending the workpiece, the workpiece is placed on the upper surface of the die 105 such that the bent portion matches the position of the groove 106.

[0008] A situation in which a workpiece, which is a metal plate material, is bent using the mold having the above structure will be described with reference to FIG. Here, FIG. 16 shows a case where a plate material used for manufacturing a box-shaped case is bent.

First, a vertical movement mechanism of a bending machine (not shown) is operated, and a punch 101 attached to a jig 104 is lowered toward a workpiece placed on a die 105. As shown in FIG. 16A, when the striking portion 102 of the punch 101 abuts on the workpiece 120 and gives a blow, the workpiece 120 is bent into an L-shaped cross section.

Therefore, as shown in FIG. 16B, two workpieces 120 and 121 bent in an L-shape are overlapped, and the two joints are welded by a welding means via a welding agent. If fixed, a box-shaped case will be manufactured.

[0009]

However, FIG.
According to the conventional example shown in FIG. 16, when the box-shaped case shown in FIG. 16B is to be manufactured, or when the plate material is to be formed to have a U-shaped cross section, there are two bent portions. In the above case, even if one plate material is bent at one position, and then the set position of the one plate material is shifted to try to bend another position, the vertical movement mechanism of the bending machine is generally used. Since the stroke is short, the portion of the plate material that has already been bent comes into contact with the punch 101 or the jig 104 to which the punch 101 is attached, and the plate material cannot be set at a desired position.

As a result, for example, in the case of manufacturing a box-shaped case as shown in FIG.
Workpieces 120 and 121, which are two plate materials cut in advance to a predetermined size, are each bent into an L-shaped cross section, and the two joining portions are welded by a welding means via a welding agent. Must be fixed.

That is, when a box-shaped case is to be manufactured, one plate material is bent at one position, and
If the sheet material can be further bent by shifting the set position, the number of joints is one, and therefore the number of welds is also one.

However, there are two places where the workpiece should be bent.
In the above case, the number of portions to be welded is more than one as described above. Therefore, the number of man-hours required for the workpiece after the bending process increases, and the problem to be solved such that the manufacturing cost of the workpiece increases,
This was in the conventional example shown in FIG.

[0013]

The present invention has been made in view of the above problems, and FIG. 1 is a perspective view showing the principle of a bending mold according to the present invention. It will be described using FIG.

In FIG. 1, a bolt 17 is attached to one end of a punch 11 for contacting and hitting a workpiece to bend the workpiece, and one support 12 for supporting the punch 11. The other end of the punch 31 is fixed to and supported by the other support 14 via a bolt (not shown). The other support 14 is connected to each support 12, 1 via fixing means such as bolts (not shown).
4 is fixed to an end of a bridge member 15 to be bridged.

On the other hand, one of the columns 12 has a projection 13 formed at the upper end thereof fitted into a recess 16 which is a cutout formed at the other end of the bridge member 15. And it connects so that rotation is possible via the support shaft 18. Therefore, when the bolt 17 is pulled out, one of the columns 12 becomes
It is separated from the state of connection with the punch 11 and opens outward.

A bridge member 1 to be bridged between the columns 12, 14
Reference numeral 5 generally attaches to a jig of a vertical movement mechanism of a press machine in which the stroke of the vertical movement mechanism is longer than that of a bending machine via a bolt (not shown).

On the other hand, as the lower die, a die 21 having a groove 22 having a predetermined sectional shape (for example, a V-shape) is used.

[0018]

Next, an embodiment of the present invention based on the principle shown in FIG. 1 will be described with reference to FIGS. Here, FIG. 2 is a perspective view of the bending mold according to the present embodiment.

In FIG. 2, the punch 31 constituting the upper die of the bending die is formed in a quadrangular prism shape.
As shown in (a), a fitting portion 34a formed in a convex shape in cross section at one end of the punch 31 fits into a notch 43 at the lower end of one support 41, and fits into the other end. The joint 34b is
After fitting into the hole of the other support column 44, each bolt 49
a and 49b are fixedly supported on the columns 41 and 44, respectively.

The configuration of the striking portion provided on the punch 31 supported by the columns 41 and 44 as described above is as follows.
The illustration is omitted in FIG. 2, and the details are shown in FIG.

In FIG. 4, reference numerals 32a to 32c denote punches 31.
The radius of curvature of a hitting portion provided on itself and for hitting the workpiece is, for example, 0.8 mm,
They are different, such as 2 mm and 8 mm.

On the other hand, reference numeral 35 denotes a striking portion formed in the shape of a quadrangular prism and fixedly attached to the punch 31 via bolts 39a to 39d. Each two-face joint (corner) of the impact portion 35 is formed so as to have four different radii of curvature. Therefore, each bolt 39a-d
Can be removed, and the striking portion 35 can be fixed again so that a two-face joint having a desired radius of curvature can be used.

As a result, the punch 31 is connected to each of the columns 41 and 44.
Each bolt 49a, 49b (FIG.
If (a)) is loosened and the punch 31 is rotated, or a desired one is selected from the four types of curvature radii of the hitting portion 35 attached to the punch 31, a total of seven types of curvature radii are provided. Can be properly used as needed. Further, it is also possible to replace and use another punch having a hitting portion having another different radius of curvature.

In FIG. 2, near each end of the punch 31, grooves 33a and 33b each having a U-shaped cross section with a predetermined depth and a width of, for example, 5 to 10 mm are provided on the short side of the punch 31. Direction. These grooves 3
3a and 33b, as shown in FIG.
This is for letting out the rising part 111 when one or both ends of the ten are formed. Such grooves 33a, 33b may be grooves 33B extending over four surfaces of the punch 31, as shown in FIG.

As described above, if the grooves 33a, 33b, 33B are provided near both ends of the punch 31, the workpiece 1
10 not only can escape the rising portion 111 (FIG. 5A), but also, as shown in FIG.
The notch 112 that needs to be provided at the bent position when the 10 is bent can be made smaller. That is, the processing time for providing the notch 112 can be further reduced.

As shown in FIG. 6A, a plurality of grooves 33a, 33a-2 to -4 are provided in advance, and the shapes corresponding to the shapes of the grooves 33a, 33a-2 to -4 are provided. Each of the embedding members 36a, 36a-2 to -4 having a shape is embedded in each of the grooves 33a, 33a-2 to -4.
a, 37a-2 to -4. Then, as shown in FIG. 6B, if one embedding member 36a is removed and the punch 31 is used according to the size of the workpiece, it is possible to easily cope with workpieces of different sizes. It is convenient.

Further, for example, the workpiece 110 in which the convex portions 113a and 113b are already formed at specific locations.
Is bent into a cross-sectional shape as shown in FIG. 7 (a), as shown in FIG.
The punch 31 may be provided with a notch 38a having a shape capable of accommodating the b. However, as shown in FIG.
Since there is a step between the surface portion of the main body of the punch 31 and each of the hitting portions 32a-c, 35, the notch 38a is required to bend the workpiece 110 in which the height of each of the convex portions 113a, 113b is low.
It is possible to cope with the punch 31 having no (FIG. 7B).

6 and 7, in order to simplify the explanation, each groove 3 at one end of the punch 31 is shown.
Only 3a, 33a-2 to -4, etc. and the notch 38a are shown.

In FIG. 2, one pillar 41 has a projection 42 formed at the upper end thereof, and a bolt (not shown) is attached to one end of a bridge member 45 which is bridged between the pillars 41 and 44.
One mounting member 47a fixed by fixing means such as
And a recess 48 formed in connection with the bridge member 45, and are connected via a support shaft 50 so as to be rotatable.

The other support 44 is fixed to a bridge member 45 via fixing means such as bolts, and the other end of the bridge member 45 has the same shape and size as the one mounting member 47a. The mounting member 47b is fixed. In addition,
The mounting members 47a and 47b provided at both ends of the bridge member 45 correspond to the shape of a jig of a press machine (not shown), but at the same time, the longitudinal direction of the bridge member 45 is changed. This is also to reinforce the strength when formed long.

The bridge member 45 has two holes 46.
a, 46b are provided, and these holes 46a, 4b are provided.
The bridge member 45 is attached to a jig of a vertical movement mechanism of a press (not shown) via a bolt passing through 6b.

On the other hand, the lower die 51 has a cross section substantially V
It has a groove 52 formed in a U-shape, and is fitted into a U-shaped groove 72 provided on a jig 71 for a lower die of a press machine. Stoppers 73a are arranged on both ends, and are fixed to the jig 71 by bolts (not shown) inserted from the lower surface of the jig 71.

The two-sided joints 53a and 53b between the upper surface of the die 51 and the groove surface are preferably formed so as to have a radius of curvature of, for example, about 3 millimeters. It is desirable because it can be smoothly pushed into the inside.

Next, the manner in which a workpiece is bent using the bending die configured as described above will be described with reference to FIGS. 8 and 9. FIG. here,
FIGS. 8 and 9 show, as an example, a case in which a workpiece, which is a plate material, is bent to produce a box-shaped case.

First, after the plate material as the workpiece 110 is placed at the set position, the punch 31 is lowered to bend a predetermined portion of the workpiece 110 as shown in FIG. Next, the set position of the workpiece 110 is shifted, and as shown in FIG. 8B, the punch 31 is lowered and the next portion is bent.

Then, as shown in FIG. 9A, the set position of the workpiece 110 is further shifted, and the punch 31 is lowered to bend the next portion, whereby the workpiece 110 is cut at one cut. It is formed into a box cylinder while leaving it.

Then, as shown in FIG. 9 (b), a bolt 49a (FIG. 2) fixing and connecting one of the columns 41 and one end of the punch 31 is removed, and the one column 41 is rotated. Then, the workpiece 110 is taken out.

After that, if only one cut in the workpiece 110 is fixed by a welding means via a welding agent, a desired box-shaped case can be obtained.
When the workpiece 110 is formed into a U-shaped cross section, for example, only the bending shown in FIGS. 8A and 8B is required, and the welding process is unnecessary.

FIG. 10 is a perspective view showing another embodiment of the present invention. Components corresponding to those in FIG. 2 are denoted by the same reference numerals. Hereinafter, differences from the embodiment shown in FIG. 2 will be described.

In FIG. 10, a die 61 having a groove portion 62 having a V-shaped cross section using a material having a slight elasticity such as polyurethane rubber, Teflon or hard rubber is used as a lower mold of a bending die. Sandwiched in the center, on both sides,
Grooves 64a, 64 having the same cross-sectional shape as the cross-sectional shape of the groove 62 of the central die 61 while using a metal such as iron.
The two dies 63a and 63b having a "b" are connected in series. Each of the dies 61, 63a, 63b is fitted in a groove 72 having a U-shaped cross section provided on a jig 71 of the press machine, and stoppers 73a, 73b (FIG. 8) are arranged at both ends thereof. I have.

Here, the height of the center die 61 is slightly higher than the height of each of the dies 63a and 63b on both sides. This is because, if the height of the central die 61 is higher than the dies 63a and 63b on both sides, when the workpiece is hit by the punch 31, the hitting portions 32a to 32c and 35 ( In FIG. 4), the vicinity of the center of the bent portion of the workpiece is hit, and the center die 61 has some elasticity.
The workpiece is pushed into a position corresponding to the grooves 64a, 64b of the respective 3a, 63b.

That is, the vicinity of the center of the bent portion of the workpiece is hit by the hitting portions 32 a to 35 c of the punch 31, and is pressed and pressed into the center die 61. Pa This is because, when using a die 51 shown in FIG. 2, the opposite end portions to each strut 11,44 is supported
When the punch 31 is hit against the workpiece, the punch 31
Because the punch 31 bends slightly due to the elasticity
This takes into consideration that the angle near the center of the bent portion is not always at the desired angle as compared to the end side of the bent portion of the workpiece. Therefore, if the dies 61, 63a, and 63b having the configuration shown in FIG. 10 are used, a desired angle can be formed near the center of the bent portion of the workpiece.

Here, the length of the central die 61 in the longitudinal direction is desirably about two thirds of the length in the width direction of the workpiece. The height of the central die 61 is preferably higher than the height of each of the dies 63a and 63b on both sides by about 1 to 3 mm. In this case, as shown in FIG. 11A, the height of the center die 61 itself may be formed so as to be higher than the dies 63a and 63b on both sides, but as shown in FIG. 11B. , Each die 61, 63
The heights of a and 63b may be all the same, and a plate 65 of iron or the like having a predetermined thickness may be laid below the central die 61. In addition, each die 61, 63a,
63b is fixed to the jig 71 by bolts 75a to 75g.

In FIG. 10, each of the dies 6
Along the longitudinal direction of each of the stoppers 7, 63a, 63b.
4a and 74b are arranged closely. This is because the center die 61 has some elasticity,
When the workpiece is pushed into the groove 62 of the die 61 by the impact of 1, the die 61 is deformed. Therefore, in order to prevent the deformation of the die 61, each stopper 74a,
It is preferable to arrange 74b closely to the die 61.

In order to prevent the deformation of the dies 61, the jig 71 is made thicker and the groove 72 provided therein is made deeper so that the upper surfaces of the dies 61, 63a and 63b are slightly exposed. Good.

Further, as shown in FIG.
In view of the above deformation, if the vicinity of the center of the two-face joint between the upper surface of the die 61B and the groove surface is formed so as to be curved so as to approach each other, the vicinity of the center of the bent portion of the workpiece is desired. Is obtained.

The configuration of the lower die of the bending die in this embodiment has been described above.
This is the same as the configuration of the upper die in the embodiment shown in FIG. Also, when bending the workpiece,
This is the same as that described with reference to FIGS. 8 and 9 for the embodiment shown in FIG.

FIG. 13 shows a configuration of a main part of still another embodiment of the present invention. Here, FIG. 13 is a perspective view showing the configuration of the upper die of the bending die, and the same components as those in FIG. 2 are denoted by the same reference numerals.

In FIG. 13, the lengths of the columns 81a and 81b for supporting the punch 31 are shown in FIGS.
Are shorter than the columns 41 and 44 shown in FIG. In each of the columns 81a and 81b, each of the projections 82a and 82b formed on the upper end thereof is fitted into a recess formed on the lower end of each of the connection columns 83a and 83b, and each of the bolts 85a is formed. , 85b.

The connecting columns 83a and 83b, which connect the columns 81a and 81b, respectively, have the convex portions 84a and 84b formed at the upper ends thereof at the both ends of the bridge member 86, respectively. It is fitted to each recess, and is connected to a bridge member 86 via a support shaft 87 and a support pin 88 which can be inserted and extracted, respectively.

Therefore, as shown in FIG.
The bolts 85a and 85c used to connect the support column 81a supporting the punch 31 and the connection support column 83a are pulled out, the support column 81a is removed, and the connection support column 83a is removed from the bridge member 86, and FIG. As shown in (5), the support column 81a can be directly connected to the bridge member 86 via the support shaft 87. That is, the support means of the punch 31 is configured to be dividable.

As shown in FIG. 13, the upper mold having the above-described configuration is formed in a convex shape in cross section and has concave portions 92a,
A mounting tool 91 having a bolt 92a is provided for each bolt 93a, 93b.
And is attached to a press machine or a bending machine via the fixture 91.

With the above configuration, when the size of the workpiece is large, the support column 81 supporting the punch 31 is used.
is connected to the connecting column 83a, and is used by attaching it to a press machine having a long stroke of the vertical movement mechanism. If the size of the workpiece is small, the connecting column 83a is removed and only the column 81a is connected to the bridge member 86. And can be used by being attached to a bending machine having a short stroke of the vertical movement mechanism. That is, there is an advantage that it can be used properly according to the size of the workpiece.

In FIG. 14, for the sake of simplicity, only one support 81a and the connection support 83a are shown, but the other support 81b (FIG. 13) and the connection support 8 are used.
3b is similarly configured.

Although FIG. 13 shows only the upper die of the bending die, any of the lower die shown in FIG. 2 or FIG. 10 may be used as the lower die.
The manner in which the workpiece is bent is the same as that described with reference to FIGS. 8 and 9 for the embodiment shown in FIG.

In each of the embodiments described above, the case where the punch 31 is formed in the shape of a quadrangular prism has been described as an example. However, the present invention is not limited to this,
For example, a punch is formed in a triangular prism shape, a hitting portion having a different radius of curvature is provided at each of two two-face joints, and two punches having three different radiuses of curvature are provided.
The present invention can also be applied to a case where a hitting portion having a surface joint is formed is attached to a punch. That is, when using a punch having at least one hitting portion,
The present invention can be applied.

[0057]

As apparent from the above description, if according to the present invention, in the above type bending mold, bread
Punch one of the two pillars
To be more separable and to be able to rotate
The workpiece that has been processed can be removed from the upper mold.
As a result, after the work piece is once set at the set position and the predetermined position is bent, the set position of the work piece can be successively shifted as it is, and further bent processing can be performed. If you are trying to manufacture a case with a U-shape, only one weld is required. If you want to manufacture a U-shaped cross-section, the welding process will not be necessary. The number of steps to be performed can be reduced, and the manufacturing cost of the workpiece can be significantly reduced.

Further, in the lower mold of the bending die,
The die that touches near the center of the bent part of the workpiece,
Since a material having some elasticity is used, the vicinity of the center of the bent portion of the workpiece is not only hit by the punching portion of the punch, but also is pressed into the die and pushed into the workpiece. A desired angle can be obtained even in the vicinity of the center of the bent portion.

Further, since punch supporting means having different lengths can be selectively used in accordance with the size of the workpiece, especially when the size of the workpiece is small, a bending machine having a short stroke of the vertical movement mechanism is used. The present invention can also be applied to. Therefore, the effect provided by the present invention is extremely large in practical use.

[Brief description of the drawings]

FIG. 1 is a perspective view for explaining the principle of the present invention.

FIG. 2 is a perspective view showing one embodiment of the present invention based on the principle shown in FIG.

FIG. 3 is a sectional view showing a support state of the punch shown in FIG. 2;

FIG. 4 is a perspective view showing a configuration of the punch shown in FIG. 2;

FIG. 5 is an explanatory diagram for explaining a groove portion in the punch shown in FIG. 2;

FIG. 6 is a cross-sectional view showing another configuration of the groove in the punch shown in FIG. 2;

FIG. 7 is an explanatory diagram for explaining a notch provided in the punch shown in FIG. 2;

FIG. 8 is an explanatory diagram for explaining a state in which a workpiece is bent using the bending mold shown in FIG. 2;

9 is an explanatory diagram for explaining a state in which a workpiece is bent using the bending die shown in FIG. 2 together with FIG. 9;

FIG. 10 is a perspective view showing another embodiment of the present invention.

FIG. 11 is a configuration diagram showing a configuration of each die shown in FIG.

FIG. 12 is a perspective view showing another configuration of the center die shown in FIG. 10;

FIG. 13 is a perspective view showing still another embodiment of the present invention.

FIG. 14 is an explanatory diagram for explaining a case where the connecting support shown in FIG. 13 is used after being removed.

FIG. 15 is a perspective view for explaining the principle of a conventional example.

FIG. 16 is an explanatory diagram for explaining a state where a workpiece is bent according to the conventional example shown in FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Punch 12, 14 Prop 13 Protrusion 15 Bridge member 16 Recess 17 Bolt 18 Support shaft 21 Dice 22 Groove 31 Punch 32a-32c, 35 Hitting part 33a, 33a-2-33a-4, 33B Groove part 34a, 34b Fitting part 36a, 36a-2 to 36a-4 Embedding members 37a, 37a-2 to 37a-4 Screws 38a Notches 39a to 39d Bolts 41, 44 Struts 42 Convex portions 43 Notches 45 Bridge members 46a, 46b Holes 47a, 47b Mounting member 48 Depression 49a, 49b Bolt 50 Support shaft 51 Dice 52 Groove 53a, 53b Two-sided joint 61, 61B, 63a, 63b Die 62, 64a, 64b Groove 65 Plate 69a, 69b Two-sided joint 71 Jig 72 Groove 73a, 73b, 74a, 74b Stopper 75a-75g Bolt 1a, 81b Posts 82a, 82b, 84a, 84b Convex portions 83a, 83b Connecting posts 85a, 85b Bolts 86 Bridge members 87 Support shafts 88 Support pins 91 Fixtures 92a, 92b Recesses 93a, 93b Bolts 101 Punches 102 Hitting portions 103a, 103b Bolt 104 Jig 105 Dice 106 Groove 110 Workpiece 111 Stand-up part 112 Notch 113a, 113b Convex part 120, 121 Workpiece

Claims (7)

(57) [Claims] 1. A bending die comprising a pair of upper and lower dies, a punch means (11, 31) for hitting and bending a workpiece (110), and said punch means. One of the punch hands for supporting
The punch means can be separated from the step and the other is fixed.
And two struts (12,14,41,44), is bridged to said two posts, <br/> to retrieve the workpiece one strut is processed of said two posts Die means (21, 51) having an upper die composed of a bridging member (15, 45) rotatably connected to the other column and having a groove (22, 52) formed in a predetermined sectional shape. And a lower die comprising: 2. The punching means is provided with at least two types of hitting portions (32a to 32c, 35) having different radii of curvature, respectively, for hitting the workpiece in contact with the workpiece. The mold for bending according to 1. 3. The punch means has at least one groove (33a, 33a-2 to -33) near each of both ends thereof.
4, 33b, 33B) is provided.
Or the bending die according to 2. 4. The at least one punch means capable of accommodating convex portions (113a, 113b) provided on a workpiece.
4. The bending die according to claim 1, wherein two notches (38a) are provided. 5. The dice means comprises: two dice means (63a, 63b) made of metal; and two dice means connected in series with the two dice means.
The two dice means are sandwiched between two dice means and are provided with a groove (62) having the same cross-sectional shape as the cross-sectional shape of the grooves (64a, 64b) of the two dice means using an elastic material. 5. The bending die according to claim 1, further comprising one die means (61) having a higher height. 6. The one die means (61B) is formed so as to be curved so that the two-surface joints (69a, 69b) of the upper surface and the groove surface approach each other. The bending mold described. 7. The two columns are each provided with a short column (8) for supporting the punch means.
1a, 81b) and connecting columns (83a, 83b) connected to the short columns.
The bending mold described.