JPH0631342A - Bender device for sheet material - Google Patents

Abstract

PURPOSE:To properly and accurately perform an overshift type L-shaped bending by means of an existing press brake, etc. CONSTITUTION:A counter retainer 3 is arranged opposite to a punch member 1. In the counter retainer 3, an engaging holder 31 and a counter holder 35 are each provided vertically movably. In the counter retainer 3, a movable bender 47 by which the L-shaped bending of a sheet material is performed is provided rotatably; and in the movable bender 47, an engaging member 51 for a L-shaped bent piece is provided which is engaged with the L-shaped bent piece by means of the L-shaped bending. In the engaging holder 31, a traction driving member 75 is provided which is detachably engaged with a traction member 69 connected with the engaging member 51 for the L-shaped bent piece and by which the engaging member 51 is drawn to the side of the counter retainer 3. Also, a permanent magnet 39 is provided in a sheet member clamping part which is constituted of the punch member 1 and the counter holder 35 ; and the punch member 1 and the counter retainer 3 are connected with each other in the thrust direction through magnetic attraction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate material bending die apparatus, and more particularly to a plate material bending die apparatus for performing L-shaped overshift type bending.

[0002]

2. Description of the Related Art As one of the methods for bending a plate material into an L shape, slit processing is applied to a bending curve portion of the plate material while leaving a fine connection portion, and the main portion of the plate material is almost along the bending curve. An overshift type L-shaped bending method is proposed in which bending is performed at 90 degrees and the bending piece is displaced in the extending direction by the plate thickness with respect to the plate material main portion to complete the L-shaped bending. .

According to the L-shaped bending method of the overshift system, a right-angled bending portion having excellent appearance can be obtained without requiring a large bending work force even if the plate material has a large thickness. To be

[0004]

The L-shaped bending method of the overshift system as described above is performed by a dedicated plate material bending machine or a bending die apparatus which performs an operation suitable for carrying out the L-shaped bending method. It can be implemented, but in any case, it has a complicated mechanism, and the L of the overshift system is used.
It is difficult to perform shape bending easily and properly.

The present invention has been made by paying attention to the above-mentioned problems, and does not require a dedicated machine or a complicated bending device, and uses the existing place brake or the like to form the L-shaped folding of the overshift system. An object of the present invention is to provide a plate bending apparatus capable of appropriately and accurately performing an L-shaped bending by a bending method.

[0006]

SUMMARY OF THE INVENTION According to the present invention, the above-mentioned object is to provide a punch member, a counter retainer arranged to face the punch member, and an opposing direction of the punch member to the counter retainer. And an engaging holder mounted movably by a predetermined amount on the engaging holder so as to be movable by a predetermined amount in the facing direction of the punch member and facing the punch member and cooperating with the punch member. And a plate holder sandwiching the plate member, a first spring member for urging the engagement holder toward the punch member by a first spring force, and the counter holder on the punch member side for the first member. Second spring member that is biased by a second spring force that is smaller than the spring force of, and a spring of the second spring member of the counter holder that is rotatably attached to the counter holder. A movable bending die that rotates in response to relative movement with respect to the counter retainer against the counter retainer to bend an L-shaped plate material, and an L-shaped bending piece that is movably attached to the movable bending die and is formed by the L-shaped bending. L-shaped bent piece engaging member that engages with the L-shaped bent piece engaging member, a pulling member connected to the L-shaped bent piece engaging member, and the first of the engaging holder that is rotatably attached to the engaging holder. Of the spring member is rotated in response to the relative movement with respect to the counter retainer against the spring force of the spring member, and is engageably and disengageably engaged with the pulling member to pull the L-shaped bent piece engaging member toward the counter retainer. And a pulling drive member, and magnets are provided on the plate member sandwiching surfaces of the punch member and the counter holder.

[0007]

According to the above-described structure, the punch member and the counter retainer are relatively displaced in the direction of approaching each other, so that the punch member and the counter holder first cooperate to sandwich the plate material (plate material main portion). At this time, the punch member and the counter holder are magnetically attracted to each other through the plate member by the magnet and rigidly interconnected. Next, the counter holder moves relative to the counter retainer against the spring force of the second spring member, whereby the movable bending die rotates and the plate material is bent into an L shape. Further, the punch member and the counter retainer are relatively displaced in the direction of approaching each other, whereby the engagement holder relatively moves with respect to the counter retainer against the spring force of the first spring member, and this movement causes the pulling drive member to move. When rotated, this engages with the pulling member and pulls the L-shaped bent piece engaging member toward the counter retainer. By this pulling, the L-shaped bent piece engaging member is displaced toward the counter retainer side, and the L-shaped bent piece is displaced with respect to the plate material main portion by the plate thickness.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

Prior to the description of the plate material bending die apparatus according to the present invention, the shape of the plate material and the overshift system which are L-shaped bent by the plate material bending die apparatus according to the present invention by the overshift method will be described with reference to FIGS. The L-shaped bending procedure will be described. 8 to 10, the plate material P is divided into a plate material main portion Pa and a bending piece Pb by a bending curve slit Sa provided along the bending curve leaving a fine connecting portion J in the bending curve portion. ing. Also, on both sides of the connecting portion J, there are bent slits S.
A connecting portion side slit Sb extending from the folding curve slit Sa to the bending piece Pb is formed in a direction substantially orthogonal to a by a length substantially equal to the plate thickness of the plate material P.

When the plate P is bent into the L shape, first, as shown in FIG. 9, the bending piece Pb is bent along the bending curve Sa at an angle of approximately 90 degrees with respect to the plate main portion Pa. After this bending is completed, as shown in FIG.
Is the extending direction of the bent piece Pb, in other words, the plate material main portion Pa.
Is pressed in the plate thickness direction to compressively deform the connecting portion J, and the bent piece Pb is displaced with respect to the plate material main portion Pa by the plate thickness of the plate material main portion Pa to bend to the end surface portion of the plate material main portion Pa. The pieces Pb overlap each other.

1 to 6 show a first embodiment of a plate bending apparatus according to the present invention. In these figures, 1 is a punch member and 3 is a counter retainer.

The punch member 1 is fixedly mounted on a fixed intermediate plate 5 of the press brake by a clamp 7, and the counter retainer 3 is fixedly mounted on a lower table 11 which can be moved up and down by a clamp plate 9, and the punch member 1 and the counter retainer are fixed. 3 and 3 are arranged to face each other.

The punch member 1 has a flat plate pressing bottom surface 13 and a vertical side surface 15 at the tip thereof, and the vertical side surface 15 is provided with a punch 17 side clamp block 19 by a roller 17 as shown in FIG. Is mounted so that it can move up and down. The punch side clamp block 19 has a corrugated plate material gripping surface 21, and is biased upward by a compression coil spring 23.

A holder receiving hole 27 is vertically formed in the counter retainer 3, and the holder receiving hole 2 is formed.
An engaging holder 31 is provided in the inside 7 by a through bolt 29 so as to be movable in a direction facing the punch member 1, that is, in a vertical direction by a predetermined amount.

A counter holder 35 is provided on the engaging holder 31 by a through bolt 33 so as to be movable in a direction facing the punch member 1, that is, in a vertical direction by a predetermined amount. The counter holder 35 has a flat plate pressing upper surface 37 facing the plate pressing bottom surface 13 of the punch member 1. A permanent magnet 39 is embedded in the punch member 1 so as to be flush with the plate pressing upper surface 37, and most of the plate pressing upper surface 37 is constituted by the permanent magnet 39.

A compression coil spring 41 is attached between the engagement holder 31 and the bottom of the holder receiving hole 27. The compression coil spring 41 biases the engagement holder 31 to the counter retainer 3 toward the punch member 1 side, that is, upward with a first spring force.

A compression coil spring 43 is attached between the engagement holder 31 and the counter holder 35. The compression coil spring 43 engages the counter holder 35 with the holder 31.
On the other hand, the punch member 1 is biased upward, that is, upward with a second spring force smaller than the first spring force.

A pivot 45 is provided on one side of the counter holder 35.
The movable bending die 47 is attached so as to be rotatable in the vertical direction. In the movable bending die 47, the counter holder 35 is shown in FIG.
When it is in the initial position as shown in FIG. 2, the horizontal posture is maintained by riding on the side-type rotation guide portion 49 of the counter retainer 3, and the counter holder 35 descends with respect to the counter retainer 3 in response to the downward movement. As shown in FIG.
Due to the abutment relationship with the side-type rotation guide portion 49, the side-type rotation guide portion 49 is rotated counterclockwise in the drawing to rise vertically.

As shown in FIG. 5, the movable bending die 47 is provided with an L-shaped bending piece engaging member 51.
As shown in FIGS. 2 and 3, the L-shaped bending piece engaging member 51 is movable in the vertical direction with respect to the movable bending die 47 in a state where the movable bending die 47 is in an upright rotating position. And is biased upward by the compression coil spring 53.

As shown in FIG. 6, a counter side clamp block 57 is attached to the L-shaped bent piece engaging member 51 by a mounting rod 55 so that the counter side clamp block 57 can be moved forward and backward, that is, can be moved in the left-right direction in FIG. ing.

The counter-side clamp block 57 faces the punch-side clamp block 19 under the condition that the movable bending die 47 is in the upright rotating position, and its facing surface is a corrugated plate material holding surface 59. The compression coil spring 61 biases the punch-side clamp block 19 in a protruding direction toward the clamp block 19.

As shown in FIG. 5, a plunger 65 is drivingly connected to the L-shaped bent piece engaging member 51 through a compression coil spring 63, and a tip end portion of the plunger 65 is connected by a pivot shaft 67. A traction member 69 is pivotally connected. As shown in FIG. 1, the pulling member 69 engages with the counter retainer 3 in the holder receiving hole 27 so as to be movable in the vertical direction, and has a hook portion 71 at the lower end portion.

A pulling drive member 75 is rotatably attached to the engagement holder 31 by a pivot 73. As shown in FIG. 4, the pulling drive member 75 is moved counterclockwise in the figure by the spring force of the tension spring 77 mounted between the lever 76 attached to the pivot 73 and the engagement holder 31. The holder receiving hole 27 is biased at the one end 79.
When the engaging holder 31 comes into contact with the inner stepped portion 81 and moves downwardly with respect to the counter retainer 3, the engaging holder 31 pivots in the clockwise direction in the drawing, and the hook portion 71 of the pulling member 69 is provided at the other end portion 83. It is adapted to be engaged with and disengaged from and to pull it downward.

According to the above configuration, the plate material main portion Pa of the plate material P is provided on the plate pressing upper surface 37 of the counter holder 35.
The folding curve slit Sa is the vertical side surface 15 of the punch member 1.
And is placed horizontally so that the bending piece Pb is located on the movable bending die 47 side. As a result, the plate material main portion Pa of the plate material P is magnetically attracted to the permanent magnet 39 on the plate pressing upper surface 37 and positioned and held.

Next, the lower table 11 is moved upward in the set state as described above. Then, the plate material P together with the counter retainer 3 is the plate pressing upper surface 3 of the counter holder 35.
7, the plate material main portion Pa abuts the plate pressing bottom surface 13 of the punch member 1, and the plate material main portion Pa of the plate material P moves to the counter holder as shown in FIG. Three
The plate pressing upper surface 37 of 5 and the plate pressing bottom surface 1 of the punch member 1.
It is sandwiched by 3 and clamped by these.

At this time, the plate pressing upper surface 13 of the punch member 1 is magnetically attracted to the plate material main portion Pa by the magnetic force of the permanent magnet 39, and the punch member 1 and the counter holder 35 are magnetically coupled to each other. As a result, the punch member 1, the counter holder 35, and the counter retainer 3 are rigidly interconnected in the thrust direction.

By further raising the lower table 11 from this state, the counter holder 35 comes to move downward with respect to the engagement holder 31 and the counter retainer 3 against the spring force of the compression coil spring 43. As the counter holder 35 descends, the movable bending die 47 is rotated in the counterclockwise direction in the figure to stand up due to the contact relationship with the side die rotation guide portion 49. Thereby, the bent piece Pb of the plate material P
Is pressed, the bending piece Pb is bent along the bending curve slit Sa with respect to the plate material main portion Pa.

As shown in FIG. 2, when the counter holder 35 descends to the lowest position with respect to the engagement holder 31, the bent piece Pb is bent by about 90 degrees with respect to the plate material main portion Pa, and the punch member is formed. 1 will rise vertically along the vertical side surface 15.

At this time, as shown in FIG.
Counter side clamp block 5 of the shape bending piece engaging member 51
7 is pressed against the bent piece Pb by the spring force of the compression coil spring 62, and the bent piece Pb is pressed by the plate material holding surface 59 of the counter side clamp block 57 and the punch side clamp block 19.
It is sandwiched by the plate material holding surface 21 and is clamped by these.

By further raising the lower table 11, the engagement holder 31 is moved downward against the counter retainer 3 against the spring force of the compression coil spring 41. According to the descending movement, the pulling drive member 75 causes the holder receiving hole 2 at the one end 79.
7 and abuts on the stepped portion 81, and rotates clockwise in the figure against the spring force of the tension spring 77, and engages with the hook portion 71 of the pulling member 69 at the other end portion 83. To pull down.

This traction force is transmitted to the L-shaped bent piece engaging member 51 via the plunger 65 and the compression coil spring 63, and L
The bending piece engaging member 51 moves toward the counter retainer 3, that is, downward, against the spring force of the compression coil spring 53.
Due to this movement, the bent piece Pb of the plate material P sandwiched between the plate material holding surface 59 of the counter side clamp block 57 and the plate material holding surface 21 of the punch side clamp block 19 and clamped by these is the punch side clamp block 19.
Is moved downward with respect to the punch member 1 against the spring force of the compression coil spring 23, and is pulled downward in the plate thickness direction of the plate material main portion Pa. By this towing, the connecting portion J
As shown in FIG. 3, the bending piece Pb is displaced downward by the plate thickness of the plate material main portion Pa with respect to the plate material main portion Pa while compressing and deforming (see FIGS. 8 to 10). The bent piece Pb overlaps with the end surface of the main portion Pa. As a result, the L-shaped bending of the plate material P by the overshift method is completed.

When the downward displacement amount of the L-shaped bent piece engaging member 51 exceeds the amount corresponding to the plate thickness dimension of the plate material P, the compression coil spring 63 bends and an excessive load acts on each part. Is avoided.

FIG. 8 shows a second embodiment of the plate bending apparatus according to the present invention. Note that, in FIG. 8, portions corresponding to those in FIG. 6 are denoted by the same reference numerals as those in FIG. In the second embodiment, a plurality of pins 85 are fixedly attached to the punch member 1. Each of the pins 85 is flush with the plate pressing bottom surface 13 at the tip surface 87, or slightly protrudes from the plate pressing bottom surface 13, and the tip surface 87 is finished with high precision flat surface.

In this embodiment, the plate member main portion Pa and the plate pressing upper surface 1 of the punch member 1 by the magnetic force of the permanent magnet 39 are used.
The magnetic attraction with 3 is locally performed exclusively at the tip surface 87 of each pin 85.

As a result, the plate pressing upper surface 1 of the punch member 1
3 and the plate material main portion Pa are not flush with each other, the punch member 1 and the counter holder 35 are magnetically coupled to each other, and the punch member 1, the counter holder 35, and the counter retainer 3 are rigidly interconnected in the thrust direction. To be done.

Further, in this embodiment, the punch side clamp block 19 is constructed so as to engage with the guide bar 89 fixed to the punch member 1 and be guided and moved up and down.

In the illustrated embodiment, the plate material gripping surface 21 of the punch side clamp block 19 and the plate material gripping surface 59 of the counter side clamp block 57 are each formed in a pointed waveform for gripping the plate material P. However, if there is a risk that the plate material P will be damaged by this, the plate material gripping surface 21,
59 may be formed in a corrugated shape having a rounded tip, and may be a mesh surface, a flat surface, a rubber sticking surface, or the like.

In the above, the present invention has been described in detail with reference to specific embodiments, but the present invention is not limited to these, and various embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

[0039]

As can be understood from the above description, according to the plate bending apparatus of the present invention, the punch member and the counter retainer are relatively displaced in the direction of approaching each other, so that the punch member and the counter holder are first moved. The plate member (plate member main portion) is sandwiched in cooperation with each other, and at this time, the punch member and the counter holder are rigidly interconnected in the thrust direction by magnetic attraction between the punch member and the counter retainer via the plate member. When the counter holder moves relative to the counter retainer against the spring force of the second spring member, the movable bending die rotates to bend the plate material L-shaped, and further, the punch member and the counter retainer Are relatively displaced in the direction in which they approach each other, the engagement holder moves relative to the counter retainer against the spring force of the first spring member, and this movement causes The pulling drive member rotates, and this engages with the pulling member, pulls the L-shaped bent piece engaging member toward the counter retainer side, and by this pulling, the L-shaped bent piece engaging member moves toward the counter retainer side. Since the L-shaped bending piece is displaced to the main part of the plate material by the amount corresponding to the thickness of the plate and the L-shaped bending of the overshift system is completed, there is no need for a dedicated machine or a complicated bending die device. The place brake or the like allows the L-shaped bending by the L-shaped bending method of the overshift method to be appropriately performed.

Further, as described above, the punch member and the counter holder are rigidly interconnected in the thrust direction by the magnetic attraction between the punch member and the counter retainer. The counter holder is prevented from being deformed and displaced in a direction away from each other, and highly accurate L-shaped bending is performed.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a plate bending apparatus according to the present invention in a plate clamped state.

FIG. 2 is a vertical cross-sectional view showing a first embodiment of a plate bending apparatus according to the present invention in a state where the bending first stage is completed.

FIG. 3 is a vertical cross-sectional view showing a first embodiment of a plate bending apparatus according to the present invention in a state in which a bending second stage is completed.

FIG. 4 is a side view showing a first embodiment of a plate bending apparatus according to the present invention.

5 is a first embodiment of the plate bending apparatus according to the present invention L
It is an enlarged front view shown in a shape bending piece engagement member arrangement part.

FIG. 6 is an enlarged vertical cross-sectional view showing a main part of a first embodiment of the plate bending apparatus according to the present invention.

FIG. 7 is an enlarged vertical sectional view showing a main part of a second embodiment of the plate bending apparatus according to the present invention.

FIG. 8 is a perspective view showing an initial shape of a plate material that is L-shaped bent by an overshift method by the plate material bending die apparatus according to the present invention.

FIG. 9 is a perspective view showing a first stage of bending of a plate material that is L-shaped bent by an overshift system by the plate bending apparatus according to the present invention.

FIG. 10 is a perspective view showing a second stage of bending a plate material that is L-shaped bent by the plate material bending die apparatus according to the present invention by an overshift method.

[Explanation of symbols]

 1 punch member 3 counter retainer 19 punch side clamp block 31 engagement holder 35 counter holder 39 permanent magnets 41, 43 compression coil spring 47 L-shaped bent piece engagement member 57 counter side clamp block 69 traction member 75 traction drive member 85 pin

Claims (1)

[Claims] 1. A punch member, a counter retainer arranged to face the punch member, an engagement holder attached to the counter retainer so as to be movable by a predetermined amount in a direction facing the punch member, and A counter holder that is attached to the engagement holder so as to be movable in a direction opposite to the punch member by a predetermined amount and faces the punch member, and holds a plate material in cooperation with the punch member, and the engagement holder. A first spring member that urges the punch member side by a first spring force, and a second spring member that urges the counter holder toward the punch member side by a second spring force smaller than the first spring force. Of the spring member and rotatably attached to the counter holder in response to relative movement of the counter holder with respect to the counter retainer against the spring force of the second spring member. And a movable bending die for rotating the plate material to make an L-shaped bending, and an L-shaped bending piece movably mounted on the movable bending die and engaged with the L-shaped bending piece by the L-shaped bending. A coupling member, a pulling member connected to the L-shaped bent piece engagement member, and a rotatably attached to the engagement holder, which opposes the spring force of the first spring member of the engagement holder. A pulling drive member that rotates in response to relative movement with respect to the counter retainer and engages with the pulling member in a disengageable manner to pull the L-shaped bent piece engaging member toward the counter retainer. A plate material bending die apparatus, wherein magnets are provided on the plate material sandwiching surfaces of the punch member and the counter holder.