JP2764354B2 - Bending machine mold length adjustment device - 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 machine for bending a metal plate into an L-shape or a U-shape, and more particularly to a bending machine for adjusting the length of a mold in accordance with the bending length of the plate. It relates to a mold length adjusting device.

[0002]

2. Description of the Related Art In recent years, a plurality of bending machines are connected by a conveyor or other conveying device to form a bending line, and a sheet material is continuously and automatically bent while controlling these bending machines with a control device. 2. Description of the Related Art A single bending machine is used to bend different portions of a plate material at acute and obtuse angles. For example, FIG.
In order to bend the edge A1 of the upper end A of the plate material W upward at an acute angle and further lower the edge B1 of the intermediate B portion as shown in FIG. It is to be bent. By the way, the bending plate material W has various dimensions, and the bending length of the portion A can be sufficiently bent without changing the mold length as long as the bending length is within the range of the length of the bending machine. It is necessary to adjust this so that the mold does not interfere with both ends of the plate material.

[0003] In order to adjust the length of the mold, FIG.
An apparatus as shown in FIG. 4 has been proposed. This device adjusts the length of the koki bending die, arranges a large number of divided koki bending die 2 on both sides of the fixed koki bending die 1, and arranges the endless running member 3 on the lower side thereof, On the traveling member 3, divided spacers 4 corresponding to the respective divided koki bending dies 2 are fixed.
To adjust the length of the mold.

FIG. 15 shows a split koki bending mold 5.
The slide bar 8 having the groove 6 and the mounting portion 7 formed therein is inserted into the lower side, and the slide bar 8 is rotated and slid by using the slide mechanism 9A and the rotation mechanism 9B to form the split koki bending die 5. Adjust the mold length.

[0005]

However, the above-mentioned conventional shape length adjusting device has the following drawbacks, and an improvement has been desired. That is, when the spacer is fixed to the endless traveling member, the portion where the length of the mold cannot be adjusted (fixed work bending type) becomes longer on the mechanism, while the slide bar type increases the cost because the mechanism becomes complicated. Moreover, the adjustment work takes too much time. Further, a problem common to both the conventional type is that the adjustment is performed with reference to the end die, so that, for example, when bending a set of two products, the mechanical load is eccentric.

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned disadvantages of the conventional type. The object of the present invention is to simplify the structure and improve the operability, and to adjust the mold length with reference to the center of the machine. An object of the present invention is to provide an adjusting device that does not cause load eccentricity.

[0007]

In order to achieve the above object, a mold length adjusting device according to the present invention is provided with a plurality of divided molds installed at a lower end of a ram or an upper end of a bed, and the ram is raised and lowered to divide the mold. A mold length adjusting device for a bending machine that bends a plate material with a mold group, wherein the mold length adjusting device divides a divided mold group into a plurality of zones along a mold length direction of the bending machine. In each of the zones, a slider for selecting a predetermined mold at the upper or lower part of the divided mold group and transmitting the pressing force of the ram or the receiving pressure of the bed to the mold is arranged, and each of the sliders is driven by a driving mechanism. In this case, the bending machine is slid along the mold length direction.

According to the mold length adjusting device of the present invention, the slider is slid in the mold length direction of the bending machine to select a mold, and the mold length is adjusted based on the center of the machine. Can be avoided, and the bending accuracy can be improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the illustrated embodiments. FIG. 1 is a cross-sectional view of a koki bending die 11 to which a die length adjusting device 10 of the present invention is attached. A lower die holder 13 arranged on the upper surface of a bed 12 has a rotating lower die 14 from the front side (left side in FIG. 1). , A lower die 16 with a cushion pad 15 and a first foot bending die 17 are sequentially arranged.
On the other hand, an upper mold holder 19 is fixed to a ram 18 vertically moving up and down toward the bed 12, and a cushion pad 2 is provided at a position corresponding to the rotating lower mold 14 attached to the lower mold holder 13.
A fixed upper die 22 is provided at a position corresponding to the upper die 21 and the lower die 16 with a zero, and a backup member 25 which can be moved up and down by an adjusting screw 24 is provided at a position corresponding to the rotation guide member 23 of the first foot bending die 17. Are arranged respectively. The lower mold holder 13 is provided with a recess 26 serving also as a relief for the rotary lower mold 14, and the upper mold holder 19 corresponding to the recess 26 is provided with a second footprint having the mold length adjusting device 10 attached thereto. A bending mold 27 is arranged.

The second workbending mold 27 is provided in a mounting groove 28 provided in the upper mold holder 19, and is provided at a center of the fixed workbending mold 29 as shown in FIG. It is composed of a group of split foot bending molds 30L and 30R. As shown in FIG. 3, the fixed die bending mold 29 is disposed in the mounting groove 28 of the upper die holder 19, and a step 31a formed on the rear wall is formed on the lower surface of the mounting groove 28 to prevent the retainer 31 from coming off.
It is placed and fixed on the top, and in this embodiment, the mold length is 200 mm.

In the present embodiment, the split-job bending mold groups 30L and 30R are constituted by 20 split-job bending molds 30a and 30b each having a mold length of 25 millimeters. Have been. Each of the split-job bending molds 30a and 30b has a shape shown in FIGS. 4 and 5, and the split-job bending mold 30a constituting the split-job bending mold 30L has a slider on the front side at the top and the other hand-job bending mold 30b has a slider described later. 4 and 5, a recess 30 is formed in the rear wall of each mold as shown in FIGS.
And is mounted on the retainer 31 of the camera.

On the other hand, a pair of sliders 32L, 32R slidable in the direction of the length of each mold group is disposed above the mold groups 30L, 30R. As shown in FIG. 3, these sliders are convex portions 3 provided at one central portion of the side wall.
Pinions 40, 41 are fitted back to back with fittings 4, 35 fitted in fitting grooves 36, 37 provided in the mounting groove 28, and engaged with racks 38, 39 provided at the top of each slider.
Slide in opposite directions due to the rotation of.

As shown in FIG. 6, each of the pinions 40 and 41 is provided with a gear 4 attached to the base end of a shaft 42 or 43.
4 and 45 are meshed with each other, and a sprocket 46 attached to one end of one shaft 43 and a drive motor 47 are connected by a chain C so that when the motor 47 is rotated, it rotates synchronously ( (FIG. 7). In FIG. 6, reference numeral 48 denotes an encoder attached to the gear 44, which is connected to a rotation control circuit of the drive motor 47.

[0014]

EXAMPLE Next , using a workpiece W as shown in FIG. 13, an edge A1 on the long side of the workpiece is subjected to an acute upward bending process,
Next, reverse bending (downward bending) is applied to the central portion B1 on the long side.
The case of making a bay window roof will be described. First, the ram 18 of the bending die 11 is operated, and the upper die 21 and the fixed upper die 22 are moved.
Then, the second handjob bending mold 27 is raised to the standby position, and then the rotary lower die 14 is rotated to wait at the bottom side of the recess 26 (FIG. 8) . In this state, the longer side A of the work W is
The ram 18 is placed on the top, the bending width is set to a predetermined size, and the ram 18 is lowered . Fixed upper die 2 by lowering of ram 18
2. The work W is held by the lower mold 16 and the ram 1
When the lower part 8 is lowered, the first foot bending die 17 rotates as shown by the arrow in FIG. 9 while being guided by the backup member 25, and bends the edge A of the work W at an acute angle.

When the bending of the end A is completed, the ram 18
Is raised, and the workpiece W is sent to the bending process side of the end portion B by the second koki bending mold 27 in the next step. That is, after the rotary lower die 14 is raised and returned to the predetermined position, the workpiece W is placed on the upper surface and the bending width is positioned to the predetermined size.
By the way, since the bent length of the end portion B is shorter than the above-mentioned portion A, and there is a portion on both sides where bending is not required, it is necessary to adjust the length of the second foot bending die 27 in bending. is there. That is, the length of the portion B of the work W is assumed to be 7
Assuming that it is 00 mm, the fixed hand bending mold 29 constituting the second hand bending tool 27 is 200 mm. Therefore, it is necessary to add 250 mm dies to the left and right of the fixed hand bending mold 27, respectively. When the drive motor 47 is rotated to rotate the pinions 40 and 41, these pinions are moved to the sliders 32L and 32R.
The sliders 32L, 32R are slid in opposite directions in the mold length direction since they are engaged with the rack portions 38, 39 formed on the upper surface of the mold. Then, as shown in FIG. 2, the tip of each of the sliders 32L, 32R has a divided Koki bending mold 30A, 30R, which constitutes a Koki bending mold 30L, 30R.
0b is slid to the position where the top surface of the tenth is pressed and stopped. Since each of the split-job bending molds 30a and 30b has a mold length of 25 millimeters, the split-job bending mold group 3 pressed by each of the sliders 32L and 32R.
The lengths of 0L and 30R are each 250 millimeters, and the length of the second hand bending die 27 including the fixed foot bending die 29 is 700 millimeters, which is equal to the bending length of the B portion of the work W. When the ram 18 is lowered in this state, the work W is sandwiched between the upper die 21 and the rotary lower die 14, and when the ram 18 is further lowered, the fixed-job bending die 29 is lowered.
The work W is pressed down by the second hand bending mold 27 composed of the split hand bending mold groups 30L and 30R located on both sides thereof and pressed by the sliders 32L and 32R (FIG. 10). Slider 32
L, 32R do not press the split-job bending mold 30a, 3
0b is on the work W which is not subjected to the pressing force of the ram 18 and is not bent when the ram 18 is lowered.

In the above embodiment, the divided mold group is divided into left and right zones around the fixed mold. However, the present invention is not limited to this. The divided mold group may be further divided into a plurality of zones. The mechanism to slide the slider is a rack,
Not only the pinion but also a cylinder may be used, and an independent drive mechanism may be arranged for each slider.

Further, in the above-described embodiment, the second handjob bending mold 27 is disposed at the center of the folding machine, and the fixed handjob bending mold 29 is provided.
And the divided handjob bending dies 30L, 30R arranged on the left and right.
However, as shown in FIG. 11, the fixed bending tool 50 is not used, and the bending tool 50 is divided into left and right split bending tool groups 5.
It may be constituted by 0L and 50R. Then, as shown in FIG. 12, sliders 51L, 51R are arranged on the upper portions of the respective split-job bending dies 50L, 50R, and pinions 53L, 5R connected to driving mechanisms 52L, 52R arranged respectively.
3R is sliders 51L, racks 54L, 54 of 51R.
The sliders may be engaged with each other to slide in the mold length direction. According to this embodiment, since a fixed-job bending die is not used, a small bending process can be performed by using, for example, one left and right split-job bending die having an arbitrary length at the center of the bending machine. It has a unique effect.

In the above embodiment, the upper die is provided with a mold length adjusting device 1.
Although the example in which 0 is arranged is shown, the mold length adjusting device of the present invention can also be arranged on the lower mold side.

Furthermore, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications and design changes can be made without changing the spirit of the invention.

[0020]

Since the present invention has the above-mentioned structure, the length of the mold can be set with reference to the center of the machine, so that the eccentric load at the time of bending can be eliminated and the bending accuracy can be improved. In addition, a small bending process can be performed using the central portion of the bending machine.

[Brief description of the drawings]

FIG. 1 is a sectional view of a bending mold to which an embodiment of the present invention is attached.

FIG. 2 is a partially omitted front view of the apparatus of the present invention.

FIG. 3 is a cross-sectional view showing a mounting state of a slider.

FIG. 4 is a cross-sectional view illustrating a split-job bending mold.

FIG. 5 is a cross-sectional view showing a split-job bending mold.

FIG. 6 is a partially omitted perspective view showing a main part of the apparatus of the present invention.

FIG. 7 is an explanatory view showing a drive mechanism of the device of the present invention.

FIG. 8 is an explanatory view showing a bent state of a work.

FIG. 9 is an explanatory diagram showing a bent state of a work.

FIG. 10 is an explanatory diagram illustrating a bent state of a work.

FIG. 11 is a front view showing a modification.

FIG. 12 is a sectional view showing a modification.

FIG. 13 is a plan view showing a work.

FIG. 14 is a diagram showing a conventional type.

FIG. 15 is a diagram showing a conventional type.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Mold length adjustment device 11 Bending mold 12 Bed 13 Lower mold holder 14 Rotating lower mold 15, 20 Cushion pad 16 Lower mold 17 1st Koki bending mold 18 Ram 19 Upper mold holder 21 Upper mold 22 Fixed lower mold 23 Guide member Reference Signs List 24 Adjustment screw 25 Backup member 26 Recess 27, 50 2nd Koki bending mold 28 Mounting groove 29 Fixed Koki bending mold 30L, 30R, 50L, 50R Split Koki bending mold group 30a, 30b Split Koki bending mold 30c, 30d Step 31 Retaining stopper 32L, 32R, 51L, 51R slider 33 concave portion 34, 35 convex portion 36, 37 fitting groove 38, 39, 54L, 54R rack 40, 41, 53L, 54R pinion 42, 43 shaft 44, 45 gear 46 sprocket 47 Motor 48 Encoder 52L, 52R Drive Structure

Claims (2)

(57) [Claims] 1. A mold length adjusting device for a bending machine, wherein a plurality of divided dies are installed at a lower end of a ram or an upper end of a bed, and the ram is raised and lowered to bend a plate material by a group of divided dies. The mold length adjusting device divides the divided mold group into a plurality of zones along the mold length direction of the bending machine, and then places a predetermined mold on the upper or lower part of the divided mold group for each of the zones. A slider for selecting and transmitting the pressing force of the ram or the receiving pressure of the bed to the mold is arranged, and each of the sliders is slid along the mold length direction of the folding machine by a drive mechanism. Adjustment device. 2. The mold length adjusting device according to claim 1, wherein the divided mold group is divided into left and right zones around a fixed mold disposed at the center of the bending machine.