JP3545024B2 - Bending method and apparatus - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a bending method for performing step bending on a work and an apparatus therefor.
[0002]
[Prior art]
Conventionally, as a means for performing step bending on a work, a step bending die is generally used with a press brake. In addition, as the bending condition, for example, a step bending process is performed on a workpiece having a thickness of 1.6 mm and a length of 1000 mm with a material of SPCC with a pressing force of 100 tons.
[0003]
[Problems to be solved by the invention]
By the way, the conventional step bending described above is a step bending in which the step is equal to the plate thickness of the work, but as shown in the bending processing conditions described above, during the step bending, the bending that requires the most required tonnage, In designing the bending die, first, the processing ability of the press brake was a problem.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a bending method and apparatus for reducing the required ton during step bending and performing step bending without difficulty as in conventional step bending in order to improve the above-mentioned problems. Is to provide.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, after a slit is formed in a plate-shaped work while leaving a fine connection portion, one of the works is moved in the thickness direction with respect to the other work with the slit as a boundary. After that, the end side of the slit side of the one work and the end side of the slit side of the other work are overlapped, and the overlapped portion is pressed in the thickness direction to perform step bending. And a bending method.
[0007]
Further, the present invention provides a punch retainer and a counter retainer which are disposed to face each other, a punch member which is mounted on the punch retainer so as to be movable by a predetermined amount in a direction facing the counter retainer, and wherein the punch retainer is provided on the counter retainer. A counter holder mounted to be movable by a predetermined amount in the opposite direction of the punch member and opposed to the punch member and holding the work in cooperation with the punch member; and a first spring provided with the punch member on the counter holder side. A first spring member for urging the counter holder toward the punch member with a second spring force smaller than the first spring force; An offset slider provided with a swing pusher that sandwiches the work and provided on one side of the punch retainer. A pressing member for pressing the swinging pusher is constituted the bending device and a thrust member which allowed to offset the work side the slider is provided on one side of the punch retainer.
[0008]
[Action]
By employing the bending method and the apparatus according to the present invention, a slit is formed in a work while leaving a fine connection portion. Next, by moving one side of the work up and down with the slit as a boundary, the stepping step, the overlapping step, and the crushing step are sequentially performed, and the work is subjected to step bending. In order to perform the step bending, a bending process including a punch retainer, a counter retainer, a punch member, a counter holder, first and second spring members, an offset slider having a swing pusher, a pressing member, and a thrust member. By using the apparatus, the step bending can be performed without difficulty by reducing the bending tonnage as compared with the related art.
[0009]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0010]
FIG. 2 (A), referring to (B), the laser beam machine fine connection portion M _J, etc. on a plate-shaped workpiece W, leaving only one side allowed to form a slit S. Thus, side slits S _L is placed on one W _{A (one} side) of the workpiece W by the slit S as a boundary.
[0011]
Move from the state of such a workpiece W state, namely Figs. 1 (A), as shown in FIG. 1 (B), the other of the workpiece W _B in the thickness direction of the arrow with respect to one of the workpiece W _A It stepped processing of bent fine connection portion M _J thickness fraction is performed by lifting and. As shown in FIG. 1 (C) in this state, when allowed to urged to the left as indicated by an arrow to overlap the end of the other of the workpiece W _B for one workpiece W _A, fine connection portion M _J Are completely bent, and an end side overlapping process is performed. Then, as shown in FIG. 1 (D), the other of the workpiece W _B to be pressed in the thickness direction from above as indicated by arrow collapsing step is carried out stage bending line processing for one of the workpiece W _A Will be
[0012]
FIG. 4 (A), referring to (B), leaving a fine connection portion M _J, etc. laser machine the workpiece W on both sides allowed to form a slit S. Thus, each side _W A of the workpiece W by the slit S as a boundary, _{W B} on either side slits _S L, _{S R} is placed.
[0013]
From the state of the work, that is, the state of FIG. 3A, as shown in FIG. 3B, a stepped step is performed in the same manner as described above, and then, as shown in FIGS. As shown in ()), the overlapping step and the crushing step are performed, and the step bending is performed.
[0014]
FIG. 6 (A), the For (B), leaving a fine connection portion M _J, etc. laser machine the workpiece W on both sides allowed to form a slit S. Thus, each side W _A of the workpiece W by the slit S as a _boundary, the oblique side slits S _K is placed in W _B.
[0015]
From the state of the work W, that is, the state of FIG. 5A, as shown in FIGS. 5B, 5C, and 5D in the manner described above, the stepping step, the overlapping step, and the crushing step are performed. Is performed.
[0016]
In this example when placed on either side oblique side slits S, as shown in FIG. 5 (D), when using the E-plane to locate the like gauging, protrude is meat surplus of fine connecting portions M _J It is something that did not exist.
[0017]
If the appearance is not a concern, the side slit width B can be made much larger than the plate thickness t (B≫t) to obtain the gauging E surface without increasing the cost. it can.
[0018]
The bent product shown in FIGS. 7A and 7B is an example of a product obtained by the bending method of this embodiment.
[0019]
Next, an embodiment of a bending apparatus for obtaining a bent product by the above-described step bending will be described.
[0020]
Referring to FIG. 8, the bending apparatus 1 includes an upper table 3 and a lower table 5. In the present embodiment, an example will be described in which the upper table 3 is fixed and the lower table 5 is moved up and down. The lower table 5 may be fixed and the upper table 3 may be moved up and down.
[0021]
A punch retainer 9 is fixed to a lower portion of the upper table 3 by a fastener 7 with a bolt, and a counter retainer 13 is fixed to an upper portion of the lower table 5 which can freely move up and down by a clamping plate 11.
[0022]
A punch member 17 is attached to the pan retainer 9 by a through bolt 15 so as to be movable by a predetermined amount in a direction facing the counter retainer 13, that is, in a vertical direction. A compression coil spring 19 is mounted between the pan retainer 9 and the top of the punch member 17 in a state where a predetermined preload is applied. The compression coil spring 19 urges the punch member 17 with a relatively large first spring force toward the counter retainer 13, that is, downward.
[0023]
A counter holder 23 is attached to the counter retainer 13 by a through bolt 21 so as to be movable by a predetermined amount in a direction facing the punch retainer 9, that is, in a vertical direction, and facing the punch member 17. The counter holder 23 has a horizontally flat upper surface facing the lower bottom surface of the punch member 17, and protrudes from the upper surface of the counter retainer 13.
[0024]
A compression coil spring 25 is mounted between the counter retainer 13 and the bottom of the counter holder 23 in a state where a predetermined preload is applied. The compression coil spring 25 urges the counter holder 23 to the punch retainer 1 side, that is, upwards with a second spring force smaller than the first spring force.
[0025]
8, an offset slider 27 is provided on a projecting portion 13T which is integrally formed on the right side of the counter retainer 13 in FIG. The plate 29 is fixed with a plurality of bolts. On the left side of the main body plate 29, there is provided a slider plate 33 having a flange 33A for holding the work W with a gap 31 therebetween. The slider plate 33 is attached to the left end of the through bolt 35. Moreover, a compression coil spring 37 is interposed between the projecting portion 13T, the side surface of the main body plate 29, and the head 35H of the through bolt 35 by urging in the right direction. A swing pusher 41 is pivotally supported on the upper portion of the slider plate 33 by a pin 39.
[0026]
A downwardly extending plate 43 is integrated with the tip of a protruding portion 9T that is integrated and protrudes to the right in FIG. 8 of the punch retainer 9. At the lower end of the plate 43, a thrust roller 45 is provided. A spool 47 is provided at a lower portion of the protrusion 9T near the punch retainer 9 side. The spool 47 is urged downward by a compression coil spring 49.
[0027]
With the above structure, for example, the end face of the workpiece W which allowed the slits S leaving the fine connecting portions M _J shown in FIG. 2 as shown in Figure 8, elaborate addition in the flange portion 33A of the slider plate 33 To place it on the counter holder 23.
[0028]
In the state of FIG. 8, when allowed to rise to the lower table 5 by a distance H _1, as shown in Figure 9, with the first compression coil spring 19 is compressed, the counter holder 13 second compression coil distance H ₁ against the urging force of the spring 25 is lowered as shown in Figure 9 the workpiece W, stepped machining is performed. At this time, as shown in FIG. 9, the thrust roller 45 relatively descends along the inclined surface 33 </ b> K formed on the slider plate 33 and enters the gap 31.
[0029]
Next, when the lower table 5 is further raised, the thrust roller 45 enters the gap 31 from the inclined surface 33K of the slider plate 33, and moves the slider plate 33 leftward in FIG. 9 against the urging force of the compression coil spring 37. Then, an overlapping step is performed as shown in FIG. And, as showed lower table 5 in FIG. 9, by allowed to rise by H _2, relatively punch member 17 together with the lowered against the urging force of the first compression coil spring 19, also the spool 47 Compression The swing pusher 41 descends against the urging force of the coil spring 49, and the swing pusher 41 rotates counterclockwise about the pin 39 to perform a step of crushing and crushing the work W, so that the work W can be easily subjected to step bending. be able to.
[0030]
In the above description, since the end face of the work W is held by the flange 33A of the slider plate 33, the work W is prevented from lifting. Further, when the crushing process is performed, since the thrust roller 45 has entered the gap 31, the lateral movement has been completely completed. Therefore, since the movement is completely completed for each step, the step bending can be performed without difficulty by reducing the bending tonnage as compared with the conventional case.
[0031]
The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes.
[0032]
【The invention's effect】
As can be understood from the description of the embodiment as described above, according to the present invention, since the configuration is as described in the claims, the required tonnage is reduced as compared with the conventional step bending process. Step bending can be performed without difficulty.
[Brief description of the drawings]
FIG. 1 is an explanatory view of an operation of performing step bending on a work having one side slit in the present invention.
FIG. 2 is an explanatory diagram for forming one side slit on a work.
FIG. 3 is an explanatory view of an operation of performing step bending on a work having both side slits according to the present invention.
FIG. 4 is an explanatory diagram for forming both side slits on a work.
FIG. 5 is an explanatory view of an operation of performing step bending processing on a work having oblique side slits on both sides according to the present invention.
FIG. 6 is an explanatory diagram for forming oblique side slits on both sides of a work.
FIG. 7 is an example of a bent product obtained by the bending method.
FIG. 8 is a front sectional view of a bending apparatus according to an embodiment for performing step bending according to the present invention.
FIG. 9 is an operation explanatory view.
FIG. 10 is an operation explanatory view.
[Explanation of symbols]
W, W _A , W _B Work M _J Fine connecting portion S Slit 1 Bending device 9 Punch retainer 13 Counter retainer 17 Punch member 19 First compression coil spring 23 Counter holder 25 Second compression coil spring 27 Offset slider 33 Slider plate 41 Swing pusher 45 Thrust roller 47 Spool

Claims (2)

After forming a slit while leaving a fine connection portion in the plate-shaped work, one of the works is moved in the plate thickness direction with respect to the other work with the slit as a boundary, and thereafter, the slit side of the one work is moved to the slit side. Wherein the end side of the workpiece and the end side of the other work on the slit side are overlapped, and the overlapped portion is pressed from the thickness direction to perform step bending. A punch retainer and a counter retainer that are arranged to face each other, a punch member that is mounted on the punch retainer so as to be movable by a predetermined amount in a direction facing the counter retainer, and a predetermined amount in the counter retainer that faces the punch retainer. A counter holder movably mounted and opposed to the punch member and holding the work in cooperation with the punch member, and a second spring for urging the punch member toward the counter holder with a first spring force. and one spring member, a second spring member for urging by said first spring force by Ri smaller second spring force on the side of the counter holder the punch member, provided on one side of the counter retainer the An offset slider provided with a swing pusher for sandwiching a workpiece; and a swing pusher provided on one side of the punch retainer. A pressing member for pressing the catcher over, a fold processing unit, characterized the slider is provided on one side and thrust members allowed to offset the work side, to become equipped with the punch retainer.

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