JPH04190925A - Bending machine - Google Patents

Abstract

PURPOSE:To bend the work upward or downward in a right angle and also to bend in an acute angle by setting the die for bending the metal sheet projecting from the space between the upper and lower stands to an acute angle at either one hand of the bend beams of the upward bending type or the downward bending type freely slidable and freely avoidable. CONSTITUTION:An upper stand 27 which clamps and fixes a metal sheet W by cooperating with a lower stand 7 supporting this metal sheet is set, an acute angle bending die device 63 for bending by an acute angle the metal sheet being projected from the space between the upper stand 27 and the lower stand 7 of the bending machine set with the upper bending die 35 in order to bend the edge part of the metal sheet W being projected from the space between the upper stand 27 and the lower stand 7 and the lower bending die 53 in order to bend the edge part of the above upward is set at the either one hand of the upper bend beam 33 or the lower bend beam 51 which support the upper bending die 35 or the lower bending die 53 freely slidable forward and backward and freely avoidable, and the edge part of the work can be bent upward and downward, and also the edge part of the work W can be bent in an acute angle by using the device 63.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention relates to a sheet folding machine, and more specifically, the present invention relates to a sheet folding machine that bends the edge of a sheet material as a pre-process of hemming. The present invention relates to a bending machine that can bend a plate material at an acute angle with one clamp as well as in the downward direction.

(Prior Art) Conventionally, a first example of a bending machine used as a pre-process for hemming a workpiece is a known folding machine for bending the edge of a plate material upward and downward. Further, a plate bending machine capable of bending the inner edge of the opening into an L-shape (right angle shape) is described in, for example, Japanese Patent Laid-Open No. 1-289513.

In a second example, in order to bend a plate material at an acute angle for the purpose of pre-hemming processing, it is first bent at a right angle. The plate is then reclamped by a very short distance and bent again at right angles in the same direction. There is also a known method that presses up a board bent into a U-shape.

Furthermore, as another third example, there is one in which the inverted-shaped pocket at the tip of the bending die is large and deep because the plate material is bent with one clamp. In other words, it is shaped like a horse's head rather than a cock's head.

(Problems to be Solved by the Invention) By the way, in the first example of the above-mentioned prior art, there are two types of bent beams: an upper bent beam and a lower bent beam. The bending machine has a wide depth and can easily bend long plates, and since the bend beam is supported by an eccentric shaft, The bending die can be easily and simultaneously adjusted to the clearance according to the plate thickness.Also, since the elevating frame can be slid vertically, the bending machine can be easily cleaned, which has many benefits. Or, there is the problem that it is not possible to bend the plate material at an acute angle with one clamp.

In the second example, the hemming process is performed by pressing the plate material bent into a U-shape from above, so even though the gap between the parallel parts of the U-shape is short, it has a large radius. This is the same as crushing a bent board, so the problem is that the edges bulge when crushed. Furthermore, since re-clamping is performed in order to bend at an acute angle, the number of steps is increased and there are also problems in terms of processing accuracy. Furthermore, since the hemming process is performed by crushing the board material bent into a U-shape from above,
Unless you have a very powerful and rigid bending machine, you can bend thin sheets (t-
There is also the problem that only hemming processes of 1,0 to 2 mm) can be performed.

In the third example, since the tip of the bending die has a horsehead shape, a large space is taken up in the front and back direction. Therefore, there is a problem in that the shape of the product is inevitably restricted.

The present invention was made in order to solve the above-mentioned problems while taking advantage of the advantages of the conventional technology. It is not possible to make sharp bends in thick plates,
It is an object of the present invention to provide a bending machine equipped with an acute-angle bending die device that does not restrict the product shape.

[Structure of the Invention] (Means for Solving the Problems) The present invention has been made to achieve the above object, and includes an upper plate that clamps and fixes the plate material in cooperation with a lower plate that supports the plate material. , and an upper bending die for bending the edge of the plate protruding from between the upper plate and the lower plate downward, and a lower bending die for bending the edge upward. In the machine, an acute angle bending die device for bending a plate protruding from between the upper plate and the lower plate at an acute angle is attached to one of the bend beams supporting the upper bending die or the lower bending die. The folding machine is configured such that it is slidably and retractably installed in the folding machine.

(Function) By employing the bending machine of the present invention, the plate material is clamped and fixed by the upper plate in cooperation with the lower plate. Next, the edge of the plate protruding from between the upper plate and the lower plate is bent upward or downward at right angles by a lower bending die or an upper bending die.

Further, when bending a plate material at an acute angle, the acute angle bending die of the acute angle bending die device is moved from the retracted position to the processing position and then pushed forward.

This action causes the plate that was previously bent at right angles to be bent at an acute angle while initially being clamped.

Then, the pre-process of hemming processing is completed.

(Example) The present invention will now be described in detail with reference to the accompanying drawings.

First, with reference to FIG. 4, the relationship between the entire bending machine and the acute-angle bending mold device will be explained.

The bending machine 1 is equipped with a fixed frame 3 having a roughly box-like shape at the bottom, and a vertical front frame 5, which forms a part of the fixed frame 3, has a vertical front frame 5 at the top, which is arranged in the left and right direction (see Fig. 4). In this case, the lower plate 7 extending in the front and back directions (facing the plane of the paper) is fixed as appropriate. This lower board 7 supports a plate-shaped workpiece W to be subjected to upward bending, downward bending, and acute angle bending.

On the other hand, a substantially box-shaped elevating frame 9 is provided above the fixed frame 3 so as to be movable in the vertical direction. That is, this elevating frame 9 connects to the sight frames 1 erected on the left and right sides of the fixed frame 3 through pin holes of a plurality of clevis-shaped swing brackets 1 fixed to the rear lower surface.
It is swingably supported on a central shaft 15 attached to 3. Further, the elevating frame 9 is constructed by a trunnion-supported elevating cylinder 21 provided between a pin hole of a roughly clevis-shaped cylinder bracket 17 fixed at an appropriate position at the rear and a hinge pin 19 attached to the side plate 13. , is configured to be vertically swung around the hinge pin 15.

Note that presser beams 23 are fixed to the swing bracket 11, and presser plates 25 extending in the left-right direction are provided at the tips of these presser beams 23. An upper plate 27 for clamping and fixing the workpiece W supported by the lower plate 7 is provided on the lower side thereof and extends in the left-right direction. Further, an appropriate number of columns 29 are provided above the presser plate 25, or fixed by brackets on the upper front side of the elevating frame 9.
Together with the lifting frame 9, the presser beam 23 also plays a reinforcing role, allowing the upper board 27 to be pushed down strongly.

With the above configuration, when the lifting cylinder 21 is operated, the lifting frame 9 is swung up and down about the central axis 15, so that the work W is clamped and fixed between the lower plate 7 and the upper plate 27, be liberated. Furthermore, raising the upper plate 27 also has the effect of making it easier to clean the inside.

Next, a rotatable first eccentric shaft 31 is supported on the swing bracket l□ 1 ].
A swingable upper hent beam 33 is supported on each of the plurality of eccentric parts-3]E formed in the. An upper bending die holder 37 having an upper bending die 35 extending in the left and right direction of force is provided at the tip end portion (left end in FIG. 4) of the plurality of upper bed beams 33.

Further, an upper bending cylinder 39 is slidably supported on the front surface of the lifting frame 9, and the lower end of the piston rod of the upper bending cylinder 39 is pivoted via a pin to a bracket attached to the upper bending mold holder 37. supported.

Note that the upper bent beam 33 and the above-mentioned F bent beam 51
The rear biasing means 41 and 43 are provided for canceling out the minute gap between the bearings and preventing backward movement, but since these are well known, a detailed explanation will be omitted.

With the above configuration, the three upper bending mold holders can be swung upward F by appropriately operating the upper bending cylinder 39. Therefore, the end portion of the workpiece W clamped and fixed between the lower platen 7 and the upper platen 27 can be bent downward by the upper bending die 35.

Next, the support plate 45 in the fixed frame 3
is provided with a plurality of generally clevis-shaped fixing brackets 47. These plurality of fixed brackets 47 include
A rotatable second eccentric shaft 49 is supported, and this second
A plurality of eccentric parts 49E formed on the eccentric shaft 49 each support a swingable lower bend beam 51. A lower bending holder 55 having a lower bending die 53 extending in the left-right direction is provided at the front end of each of these lower bending beams 51 .

Furthermore, the lower bending cylinder 57 is swingably supported by the support plate 45, and the L end of the piston rod is pivotally supported by a bracket attached to the lower bending type holder 55 via a pin.

With the above configuration, by appropriately operating the lower bending cylinder 57, the lower bending die holder 55 is swung in the vertical direction, and the end portion of the workpiece W can be bent upward.

A clearance adjustment device 59 is provided to move the swing centers of the upper bent beam 33 and the lower bent beam 51 back and forth in accordance with the plate iv of the workpiece W. More specifically, a motor 1, such as a pulse motor or a servomotor, which is capable of forward and reverse rotation is installed, and this motor 6 and a reduction gear of the five clearance adjustment devices are interlocked and connected via a heald. ing.

Further, the output shaft of this speed reduction device is interlockingly connected to the second eccentric shaft 49 via a gear, and is connected to the second eccentric shaft 49 via a gear.
9 is also interlockingly connected to the first eccentric shaft 31 via a gear.

With the above configuration, the lower plate 7 has the workpiece W clamped and fixed.
The clearance between the upper plate 27, the upper bending die 35, and the lower bending die 53 can be adjusted simultaneously according to the thickness of the workpiece W. Furthermore, after the bending of the workpiece W is completed, the motor 6 is turned on as appropriate.
Operate the upper bend beam 33 and lower bend beam 51.
By moving the workpiece W forward, the edge of the workpiece W can be bent at a slightly acute angle to correct spring back.

Next, the edge of the workpiece W, which is clamped and fixed by the lower plate 7 and the upper plate 27, is bent upward at a right angle, and then further bent at an acute angle to facilitate accurate hemming. The acute angle bending mold device 63 will be explained based on FIGS. 1 and 2.

First, the hinge pin 6 provided on the clevis-shaped bracket 65 attached to the rear lower part of the upper bending type holder 37
7, a swing arm 69 is swingably supported. A hinge pin 71 is provided at the tip of the swinging arm 69 (the left end in FIG.
A number of short links 73 are pivotally supported. Another hinge pin 75 is provided at the tip of these links 73,
A pin hole provided at the rear and lower part of the acute angle bending die 77 is rotatably supported. This acute angle bending die 77 is shown as two pieces, a tip bending die part and a mounting bladder/bottom part, in the figure, but in terms of operation, it can be considered as one piece.

In order to maintain the posture of the acute angle bending die 77, a hinge pin 81 is provided on a clevis-shaped bracket 79 attached to the lower front of the upper bending die holder 37, and a hinge pin 81 is provided at the upper rear of the acute angle bending die 77. It is rotatably supported by another pin hole. Furthermore, in order to further stabilize the posture of the acute angle bending die 77, the upper surface 77 of the acute angle bending die 77 is
a is brought into contact with the lower surface 35a of the base of the upper bending die 35 by a retraction cylinder 91, which will be described later.

On the other hand, the hinge pin 85 of the bracket 83 fixed to the front upper surface of the swing arm 69 and the upper bending type holder 3
Bracket fixed to the top surface of 7, hinge pin 8 of Soto 87
9, there is a rod side trunnion type retraction cylinder 9.
The hinge pin 85 is rotatably engaged with the tip hole of the piston rod.

With the above configuration, when the evacuation cylinder 91 is extended, the first
The acute angle bending die 77 is held in the working position as shown by the solid line in FIG. 3 and the dashed-dotted line in FIG. That is,
Since the line of action of the retraction cylinder 91 is behind the hinge pin 81, the upper surface 77a of the acute angle bending die 77 is connected to the upper bending die 35.
The acute-angle bending die 77 is held in the working position by being brought into contact with the bottom surface 35a of the base.

When the acute angle bending die 77 is in the working position as described above, the first eccentric shaft 31 for adjusting the clearance is moved by the motor 61.
If the upper bending beam 33 is moved forward by operating the upper bending beam 33 appropriately, the tip of the acute-angle bending die 77 will press the workpiece W against the beak-shaped rear end of the upper plate 27, as shown by the two-dot chain line in FIG. Can be bent at sharp angles.

This operation completes the pre-process for the next hemming process.

By the way, if the acute angle bending die 77 is in the working position, it is inconvenient because it gets in the way when the edge of the workpiece W is bent downward or upward at right angles by the upper bending die 35 or the lower bending die 53.

Therefore, as shown by the solid line in FIG. 2, the evacuation cylinder 91
By contracting, the acute angle bending die 77 can be retracted by rotating upward around the hinge pin 81 supported by the upper bending die holder 37 via the bracket 79.

In addition, the acute angle bending type evacuation explanatory diagram in Figure 2 shows the injury evacuation position with a solid line, whereas if it were shown with a two-dot chain line as in other figures, the evacuation position would be unclear due to other parts such as the link 73. This is because.

As can be understood from the above description, the effect of this embodiment is that first, after the end of the work W which is clamped and fixed by the lower plate 7 and the upper plate 27 is bent at a right angle by the lower bending die 53, Since the workpiece W can be bent at an acute angle by the acute angle bending die 77 in the clamped state, processing accuracy is improved and the number of processing steps is reduced, allowing efficient work.

Being able to do acute angle bending work with just one clamp means that
This not only improves the accuracy of the subsequent hemming process, but also enables hemming of thick plates with a smoother finish.

Also, since the upper bending die 35 and the lower bending die 53 are supported by a separate bend beam 33.51, the lower plate 7 and the upper plate 27
It is possible to make the edge of the workpiece W which is clamped and fixed to protrude significantly backwards. Therefore, there are almost no restrictions on the product shape.

Furthermore, the first and second eccentric shafts 31.49 are connected to one motor 61.
By operating the , it is easy to adjust the position of the upper and lower bending dies 35 and 53 according to the thickness of the workpiece W, and the clearance adjustment device 59 can also be used as is to move the acute angle bending die 77 forward and backward. is easy and leads to cost reduction.

On the other hand, since the upper plate 27 can be raised largely about the central axis 15 by the lifting cylinder 21 relative to the lower plate 7, the interior can be easily cleaned.

Note that this invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments by making appropriate changes.

For example, in the above-mentioned embodiment, an acute-angle bending die device is attached to the upper bending die holder, and the edge of the workpiece, which has been finally bent upward at right angles by the lower bending die, is made into an even more acute angle. However, if you want to bend the edge of the workpiece, which has been bent downward at right angles by the upper bending die, to an even more acute angle, lower the acute-angle bending die device. It will be easily understood that it can be applied by attaching it to a bending type holder.

[Effects of the Invention] As can be understood from the description of the embodiments as described above, according to the present invention, the edges of a plate-shaped workpiece can be bent upward and downward, and the workpiece can be bent as described above. The edge of the workpiece can be bent at an acute angle using the acute-angle bending die device while the clamp remains in place when the workpiece is bent upward or downward.

Therefore, there is an effect that the processing accuracy is improved, the finish of the hemming process in the post-process is good, and it is possible to hem a thick plate.

Furthermore, since acute angle bending is performed with one clamp, the number of work steps is reduced and it is efficient.

[Brief explanation of the drawing]

FIG. 1 shows the main part of this invention, and I in FIG.
2 is an explanatory diagram of an acute-angle bending type retraction mechanism; FIG. 3 is an explanatory diagram of an acute-angle bending process; and FIG. 4 is an illustration of an embodiment of the present invention. It is a right side explanatory view showing the entire folding machine. 1...Bending machine 7...Lower board 27...Upper board
33... Upper bend beam 35... Upper bending die 51... Lower bending beam 53... Lower bending die 63... Acute angle bending mold device 77... Acute angle bending die 91... Retreat Cylinder agent Patent attorney Hidekazu Miyoshi 1 - Bending lfi 7 Lower plate 27 - Upper plate 33 Upper bend beam 35 Upper bending die 5 - Lower bending beam 53 - Lower bending die 63 Acute angle bending mold device 77 Acute angle Bending mold 91 Evacuation cylinder 1st
Figure 2 Figure 3

Claims (1)

[Claims] An upper plate is provided for clamping and fixing the plate material in cooperation with a lower plate supporting the plate material, and an upper bending mold for bending the edge of the plate material protruding from between the upper plate and the lower plate downward; The bending machine is provided with a lower bending die for bending the edge portion upward, and includes an acute-angle bending die device for bending the plate material protruding from between the upper plate and the lower plate at an acute angle. A bending machine characterized in that the bending machine is provided on either one of the bend beams supporting the upper bending die or the lower bending die so as to be slidable back and forth and retractable.