JPH0685938B2 - Folding machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending machine, and more particularly to a bending machine in which a work holding ram for pressing a work and a bending ram for bending the work are of a swing type.

(Technical Background of the Invention and Problems Thereof) Conventionally, various types of bending machines for bending a work are known. Among the various types of bending machines, bending for bending a work upward (hereinafter referred to as forward bending) and bending for bending a work downward (hereinafter referred to as reverse bending). Swing-type bending machines are well known and in use.

In this swing type bending machine, for example, a work is placed on a bottom die, and the work is pressed and clamped by a top die provided under a work holding ram. This work holding ram is generally operated by vertical movement. Therefore, a ram guide is required, and there is a problem that accurate bending cannot be performed without the ram guide. Further, even when the work holding ram is of a swing type, it is provided separately from the bending ram, which is very troublesome in terms of operation and very troublesome in terms of production.

(Object of the invention) The object of the present invention was proposed in view of the above circumstances in order to improve the problem. By arranging the swing centers of the work pressing ram and the bending ram on the same axis, the manufacturing is facilitated. The present invention is to provide a folding machine that is compact and compact and easy to handle in operation.

(Structure of the Invention) In order to achieve the above object, the present invention places a work on a lower die provided on an upper part of a lower frame, and vertically swingable work holding ram provided on the lower frame. A bending ram that is provided in the lower part of the lower mold to move toward and away from the lower mold to clamp the work, and can swing vertically with respect to the work clamped between the lower mold and the upper mold. Is a bending machine for performing normal bending or reverse bending on a work, in which the swing center of the work holding ram and the bending ram are arranged on the same axis, and the work holding ram and the bending ram are independent of each other. It is configured to be rocked.

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

Referring to FIG. 1, FIG. 2 and FIG. 3, a lower die 7 is attached to and detached from the lower frame 3 of a swing type bending machine 1 via a lower die holder 5 in the left-right direction in FIG. It is provided to extend freely.

Above the lower frame 3, a swingable work holding ram 9 is provided. An upper die 13 is provided at a lower portion of the work holding ram 9 via an upper die holder 11 so as to extend in the left-right direction in FIG. 1 so as to correspond to the lower die 7.

Then, the work W such as a plate material is placed on the lower die 7, and the swingable work holding ram 9 lowers the upper die 13 and presses the lower die 7 to clamp the work W. is there.

On the rear side of the work holding ram 9, the work holding ram 9
A plurality of supporting plates 15 for supporting the above are integrally provided, and each supporting plate 15 is integrated on the rear side with a mounting plate 17 extending in the left-right direction in FIG.

Between the support member 15 of the work holding worm 9 and the lower frame 3, a crank shaft 19 for swinging the work holding ram 9 is provided, and a plurality of crank shaft holding members 21 are provided as shown in FIGS. 4 and 5. It is supported by and 23 and 23. More specifically, as shown in FIGS. 4 and 5, a plurality of crankshaft retainers 21 are mounted on the upper portion of the lower frame 3 via a plurality of mounting plates 25.

On the other hand, a plurality of crankshaft retainers 23 are attached to the lower portion of the support member 15 of the work retainer ram 9 via attachment plates 27. A plurality of crankshaft retainers 21, 23 are fitted to the crankshaft 19 to support the crankshaft 19.

A plurality of supporting members integrated on the rear side of the work holding ram 9.
A plurality of brackets 29 are provided on the mounting plate 17 mounted on the right side of the rear part of FIG. 3 as shown in FIG. Each of these brackets 29 has a pin 31
Thus, one main clamp cylinder 33 as a clamp device and a plurality of sub clamp cylinders 35 are attached.

Main clamp cylinder 33, sub clamp cylinder 35
As shown in FIG. 3, a rod 37 is attached to the lower portion of the rod 37, and an attaching member 39 is provided to the lower portion of the rod 37. On the other hand, on the rear end side of the lower frame 3, the bracket
41 is attached, and the attachment member 39 attached to the lower part of the rod 37 and the bracket 41 are pivotally supported by a pin 43, and the attachment member 39 with the pin 43 as a fulcrum is a right side as shown by an arrow in FIG. It can rotate in any direction.

With the above configuration, when the main clamp cylinder 33 and the plurality of sub clamp cylinders 35 are operated, the rod 37 moves upward. The rod 37 moves upward and is rotated leftward in FIG. 3 with the pin 43 as a fulcrum.
Thus, the work holding ram 9 is swung about the crankshaft 19 from the position indicated by the chain double-dashed line, and is swung to the position indicated by the solid line in FIG. 3 to place the work placed on the lower die 7. W is clamped and held by the upper mold 13 provided at the lower part of the work holding ram 9.

Therefore, the work holding ram 9 is swingably swung about the crankshaft 19.

As shown in FIGS. 3-5, the crankshaft
An eccentric portion 45 which is coaxial with the crankshaft 19 and is eccentric to the axis of the crankshaft 19 is arranged, and the eccentric portion 45 is provided with a bending ram 49 via a plurality of bending arms 47. As shown in FIG. 3, a pair of bending pushing members 51A and 51B for bending the work W forward or backward is detachably attached to the tip of the bending ram 49. The bending and pressing member 51A bends the work W in the forward bending, and the bending and pressing member 51B bends the work W in the reverse bending.

With the above configuration, the swing centers of the work pressing ram 9 and the bending ram 49 are arranged on the same axis, and the work pressing ram 9 and the bending ram 49 are arranged.
Since the 49 and the rocker 49 are independently rocked, the manufacture is facilitated, the size is reduced, and the handling in operation is easier than in the conventional case.

As shown in FIGS. 1 to 3, the work W is selected from forward bending or reverse bending, and a bending select as a drive adjusting device in which the eccentric portion 45 on which the bending ram 49 swings is adjustable. A cylinder 53 is provided on one side of the lower frame 3, for example, on the right side in FIG.

In order to adjust the eccentric position of the eccentric part 45 that swings the bending ram 49 by the bending select cylinder 53 upward or downward, the encoder 55, which is a rotation detecting device for detecting the rotation of the crankshaft 19, fixes the bracket 57. It is provided on one side of the lower frame 3 via. That is, FIG. 1 and FIG.
On the left side of the drawings, FIGS. 4 and 5, a bracket 57 is attached to the left side of the crank presser 21 which is attached to the lower frame 3 via the attachment plate 25. An encoder 55 is attached to the bracket 57 so as to correspond to the axis of the crankshaft 19, and detects the rotation of the crankshaft 19. By detecting the rotation of the crankshaft 19, the eccentric portion 45 in which the bending ram 49 swings during normal bending or reverse bending
The eccentric position of can be adjusted.

With the above configuration, a bending select cylinder 53 as a drive adjusting device that selects forward bending or reverse bending and that can adjust the eccentric position of the eccentric portion 45 on which the bending ram 49 swings is adjustable.
Is provided on one side of the lower frame 3, the bent portion of the work W can be bent at a right angle, and the front and rear positions of the bending ram 49 can be adjusted with respect to the change in the thickness of the work W.

Further, as shown in FIGS. 2 and 3, a bending cylinder 61 as a bending device, which will be described in detail later, is provided at a lower portion on the right side from the rear center of the lower frame 3 via a bracket 59. One end is attached. The other end of the bending cylinder 61 is attached to a bending adjusting arm 63, the bending adjusting arm 63 is fitted to the crankshaft 19 as shown in FIGS. 4 and 5, and the tip of the bending adjusting arm 63 is further fitted. The part is attached to the bending ram 49.

As shown in FIGS. 2 and 3, each bending arm 47 is attached with one end of a bending pressure cylinder 65 as a bending device whose details will be described later. The other end of the pressure cylinder 65 is attached to the lower portion of the rear portion of the lower frame 3 via a bracket 67.

Further, as will be described in detail later, a bending correction cylinder 69 as a bending correction device for overbending after the work W is subjected to forward bending or reverse bending processing, as shown in FIGS. It is attached to 19 via a bending correction arm 71.

With the above configuration, the bent portion of the work W is bent forward or backward, and further bent, so that the bent portion of the work W is accurately and easily formed.

As shown in FIG. 1, with respect to the lower mold 7 provided on the lower frame 3 via the lower holder 5, the upper mold 13 provided on the lower part of the work holding ram 9 via the upper holder 11
Moves down due to the swing of the work holding ram 9, and clamps the work W placed on the lower die 7. Upper mold for the lower mold 7 when the work W placed on the lower mold 7 is clamped by the upper mold 13.
In order to obtain the reference position of 13, lower stoppers 73 are provided on the upper portions of the lower frame 3 on both sides of the lower mold 7 in FIG.

On the other hand, in FIG. 1, upper die holders on both sides of the upper die 13
Upper stoppers 75 are provided at the lower portions of the respective 13 so as to correspond to the lower stoppers 73. Thus, the lowering of the work holding ram 9 causes the upper stopper 75 to come into contact with the lower stopper 73, so that reference alignment is performed when the workpiece is bent forward or backward.

When the work W is placed on the lower die 7 and the work holding ram 9 swings to lower the upper die 13 to clamp the work W,
When a plate material is used for the work W and the plate thickness of the work material is thicker than the reference thickness, a gap may be formed between the rear part of the upper die 13 and the work W, and the work W may not be clamped almost completely. . In order to avoid this incomplete clamped state, a height position adjusting device 77 that can adjust the height position of the lower die 7 according to the thickness change of the work W, for example, the plate thickness change of the plate material.
Is provided on the front side of the upper portion of the lower frame 3, as shown in FIGS. 1, 2, and 3. The height position adjusting device 77 may be provided in the upper die holder 11 to adjust the height position of the upper die 13.

With the above-described configuration, a height position adjusting device in which the height position of the lower die 7 can be adjusted according to the thickness change of the work W
By providing 77 on the front side of the lower frame 3, the swingable work pressing ram 9 does not need a ram guide, and the height position of the lower mold 7 can be easily adjusted according to the thickness change of the work W. It can be adjusted and bent accurately.

To briefly explain the processing sequence in this embodiment, the work W is placed on the lower die 7 provided on the upper portion of the lower frame 3. In this state, the bending select cylinder 53 provided on the right side of the lower frame 3 in FIG. 1, for example.
The forward eccentric position of the eccentric portion 45 is determined to be a predetermined value in the clockwise direction in FIG. 3 by rotating the crankshaft 19 in the clockwise direction in the case of the correct bending. It is rotated to the upper position. In the case of reverse bending, by rotating the crankshaft 19 counterclockwise, the eccentric position of the eccentric portion 45 is rotated counterclockwise in FIG. 3 to a predetermined lower position.

Next, a support member 15 provided at the rear of the work holding ram 9
The work clamp ram 9 is swung down around the crankshaft 19 as the central axis by operating the main clamp cylinder 33 and the plurality of sub clamp cylinders 35 provided on the lower die frame 3 via the The lower mold 7 and the upper mold 13
It is clamped between and and pressure is maintained. In the case of normal bending, a bending cylinder provided in the lower rear part of the lower frame 3
61 is operated to rotate the bending ram 49 clockwise through the bending arm 47 with the eccentric position of the eccentric portion 45 as the central axis. In the case of reverse bending, the bending cylinder 61 is operated to rotate the bending ram 49 counterclockwise through the bending arm 47 with the eccentric position of the eccentric portion 45 as the central axis.

A plurality of bending cylinders 65 provided in the lower portion of the rear portion of the lower frame 3 are operated in synchronization with the bending cylinder 61, and the bending cylinder 61 causes the bending ram to move.
Bending and pushing members 51A, 51 detachably provided at the tip of 49
The work W is bent forward or backward at B. Further, the bending and pressing cylinder 65 presses the work W to bend it almost completely.

Further, the bending correction cylinder 69 provided at the rear of the lower frame 3 is operated so that the work W is uniformly bent at a substantially right angle, and the work W is overbended.
As a result, the work W has been subjected to forward bending or reverse bending processing in which a uniform bent portion is formed.

Prior to performing the bending process, the height position of the lower die is previously adjusted by a height position adjusting device 77 provided on the front side of the upper portion of the lower frame 3 according to the change in the plate thickness of the work W, for example. Needless to say.

Bending select cylinder 53 as the drive adjusting device described above.
Is provided on one side of the lower frame 3, for example, on the right side in FIG. More specifically, as shown in FIGS. 6 and 7, a gear box 79 is mounted on the side portion of the lower frame 3. An inclined support member 81 is fixed to the lower portion of the gear box 79 with a plurality of bolts 83 and the like. Rack holders 87, 89 having a rack 85 built therein are fixed to the upper and lower sides of the support member 81 in the longitudinal direction of the support member 81 with a plurality of bolts 91 and the like.

A pinion 93 meshing with the rack 85 is rotatably supported by a plurality of pins 95 in a gear box 79. Pinion
The crankshaft 19 is fitted in the shaft center of 93, and is rotated in the same direction as the pinion 93 is rotated.

Inside one end side of the rack holder 87, a rod 97 connected to the rack 85 is provided in the lower side in FIG. 6, and the rear end portion of the rod 97 projects the rack holder 87 toward the rear end.
An air cylinder 99 for moving the rod 97 in the axial direction is provided on a part of the rod 97.

A rod 101 connected to a rack 85 is provided inside the other end of the rack holder 89, and a tip portion of the rod 101 projects inside the rack holder 89 toward the tip.

Stoppers 103A and 103B having substantially the same shape at the rear and front ends of the rods 97 and 101 connected to the rack 85, respectively.
Is installed. The stopper members 103A and 103B are attached to the rods 97 and 101 near the inner side of the stopper members 103A and 103B.
Absorbing devices 105A and 105B having substantially the same shape are provided for absorbing a shock when they come into contact with each other.

The absorption devices 105A, 105B are provided with pistons 107A, 107B, and the absorption devices 105A, 105B are provided with, for example, pressure oil, or oil passages 109A, 109B for removing the pressure oil, It communicates with the piston chambers of the pistons 107A and 107B.

With the above configuration, the air cylinder 99 is operated to operate the rack 85.
6 is moved in the direction A in FIG. 6 to rotate the pinion 93 counterclockwise to select forward bending, and the eccentric position of the eccentric portion 45 is changed from the horizontal position to the upper position. It will be positioned.

By operating the air cylinder 99 to move the rack 85 in the B direction in FIG. 6, the pinion 93 rotates clockwise and reverse bending is selected, and the eccentric position of the eccentric portion 45 is set to the horizontal position. It will be positioned below the position.

When the rack 85 moves in the A direction and B direction, the rods 97 and 101 connected to the rack 85 move in the A direction and B direction, respectively.
The stopper members 103A and 103B come into contact with the absorbers 105A and 105B. Oil pressure is previously supplied to the oil passages 109A and 109B in the absorbers 105A and 105B, and the pistons 107A and 107B are moved to the stopper members 103A and 103B, respectively. Stopper member 103
When A, 103BG comes into contact with the absorbers 105A, 105B, the pistons 107A, 107B of the absorbers 105A, 105B are stopped by the stopper members 103A, 1B.
By moving to the opposite side of 03B, the impact force of the stopper members 103A and 103B is absorbed.

One end of a bending cylinder 61 as a bending device is attached via a bracket 59 to the lower part of the lower frame 3 on the right side from the rear center thereof. More specifically, as shown in FIG. 8, a plurality of screws are provided in the lower part of the lower frame 3 toward the right side from the center of the rear part.
The bracket 59 is fixed with 111 etc.

A mounting member 115 is attached by a pin 113 to a rear end portion of a lower portion of the bracket 59. One end of a rod 117 is attached to the upper end of the attachment member 115, and the other end of the rod 117 is attached to one end of a bending cylinder 61, for example, an air cylinder at three positions. One end of a rod 119 is attached to the other end of the bending cylinder 61. The other end of the rod 119 is attached to the lower part of the attachment member 121.

On the rear side of the bending cylinder 61 in FIG. 8, the upper and lower ends of the guide bar 123 extending vertically in the longitudinal direction of FIG. 8 of the bending cylinder 61 are inserted into the rear protrusions of the mounting members 115 and 121. ing. Moreover, the bending cylinder 61 is pressed by the pressing member 125 at a position substantially in the center of the guide bar 123.

On the upper end of the mounting member 121, one end of a bending adjustment arm 3 extending in the left-right direction in FIG. 8 is pivotally supported by a pin 127. The other end of the bending adjustment arm 63 is fixed to one end of the bending arm 47 with a plurality of screws 129. An eccentric portion 45 of the crankshaft 19 is built in between the bending adjustment arm 63 and the bending arm 47.

The other end of the bending arm 47 is fixed to the bending ram 49 with a plurality of bolts 131 or the like. On the front surface of the bending ram 49, the bending pressing members 51A and 51B described above are detachably attached.

Moreover, in the case of forward bending, the eccentric position of the eccentric portion 45 is set to the upper position 45A by the bending select cylinder 53 described above.
In the case of reverse bending, the eccentric position of the eccentric portion 45 is selected and located at the lower position 45B.

With the above configuration, when the bending cylinder 61, which is, for example, a three-position air cylinder, is operated to move the bending cylinder 61 downward, the bending adjustment arm 63 causes the eccentric position 45A of the eccentric portion 45A.
Is slightly rotated in the clockwise direction around the center, and the bending ram 49 is rotated about the eccentric position 45A of the eccentric portion 45 through the bending arm 47 in the clockwise direction. Bending ram 49
The bending and pushing member 51A attached to the front of the work W slightly rotates clockwise, and the work W is bent in the forward direction.

On the other hand, when the bending cylinder 61 is operated to move the bending cylinder 61 upward, the bending adjustment arm 63 slightly rotates counterclockwise around the eccentric position 45B of the eccentric portion 45, and the bending arm 47 is moved. The bending ram 49 rotates counterclockwise about the eccentric position 45B of the eccentric portion 45 via the bending ram 49. Thus, the bending pushing member 51B mounted in front of the bending ram 49 slightly rotates counterclockwise, and the work W is bent in the reverse bending direction.

The bending pressurization at the time of forward bending or reverse bending is performed by a bending pressurizing cylinder 65 described later.

The bending cylinder 65 as the bending device described above is provided below the rear portion of the lower frame 3 via the bracket 67. More specifically, as shown in FIG. 9, one end of the bending pressure cylinder 65 is attached to the lower frame 3
It is fixed by a pin 133 to the upper end of a bracket 67 attached to the lower part of the rear part of the. A rod 135 is attached to the other end of the bending pressurizing cylinder 65 so as to extend and contract in the axial direction. The tip of the rod 135 is attached to one end of a mounting member 137 and fixed by a bolt 139 or the like.

A pin 141 is inserted into the other end of the mounting member 137 and a rear end portion 47A extending to the lower portion of the bending arm 47, and fixed by a set screw 143 or the like. In the bending arm 47,
An eccentric portion 45 of the crankshaft 19 is pivotally supported. Bending arm 47
As shown in FIG. 8, a bending ram 49 is attached to the left end of FIG. 9 by a plurality of bolts 131, etc. as shown in FIG.
Bending and pressing members 51A and 51B are detachably provided on the left side of the tip portion of the bending ram 49 in FIG.

With the above structure, the bending pressurizing cylinder 65 is actuated to push the rod 135 upward to the upper left in FIG. 9, whereby the bending arm 47 moves clockwise about the eccentric position 45A of the eccentric portion 45 (see FIG. 8). Rotate around. as a result,
The bending pressing member 51A mounted in front of the bending ram 49 also rotates clockwise to bend the workpiece W in a forward bending and is pressed.

On the other hand, by actuating the bending pressure cylinder 65 and pushing the rod 135 downward and to the right in FIG. 9, the bending arm 47 rotates counterclockwise about the eccentric position 45B (see FIG. 8) of the eccentric portion 45. Turn to. As a result, the bending ram 49
The bending and pushing member 51B mounted in front of is also rotated in the counterclockwise direction to bend the work W in the reverse bending and be pressed.

A bending correction cylinder 69 as a bending correction device for overbending after the work W is subjected to forward bending or reverse bending is attached to the crankshaft 19 via a bending correction arm 71. More specifically, as shown in FIG. 10, one end of the bending correction cylinder 69 has a rod 145 protruding to the left side in FIG. 10, and the rod 145 is attached to an attachment member 147 with a set screw 149 or the like. The mounting member 147 is fixed to the bending correction arm 71 with a pin 151. In the bending correction arm 71, the crankshaft 19 and the crankshaft 19
The eccentric part 45 is built in.

On the other hand, the other end of the bending correction cylinder 69 has a rod 145 protruding to the right side in FIG. 10 and a stopper member 1 at the right end.
53 is provided. An absorbing device 155 is provided near the inner side of the stopper member 153 of the rod 145 to absorb a shock when the stopper member 153 abuts.

The absorber 155 is provided with a piston 157, and the absorber 155 is provided with an oil passage 159 communicating with the piston 157. A spring is provided in the piston chamber in which the piston 157 is provided.

A bracket 163 is attached to the tip end portion of the bending correction cylinder 69 via a pin 161, and a lower portion of the bracket 163 is attached to the lower frame 3 with a plurality of bolts or the like.

With the above configuration, when the bending correction cylinder 69 is operated and the rod 145 moves leftward in FIG. 10, the crankshaft 19 is rotated counterclockwise (or clockwise) via the bending correction arm 71. The eccentric position is 45A (or 45A
Since it is moved from the position B) to the position 45C (or 45D), the bending ram 49 is pushed leftward. When the bending ram 49 is pushed leftward, the bending pressing members 51A and 51B mounted in front of the bending ram 49 are pushed leftward, and the work W
In addition, the bent portion bent by the bending pressure cylinder 65 described above is overbended to form the bent portion uniformly at a right angle.

When the bending correction cylinder 69 is operated, as shown by the chain double-dashed line in FIG. 10 when the bending select cylinder 53 is selected, when the eccentric position of the eccentric portion 45 is normally bent, the position 45A is reversely bent. If you want to be in position 45B, each position
Positions 45C, 4 from 45A, 45B by actuation of bend compensation cylinder 69
It will be pushed by 5D and will be overbend.

Further, when the rod 145 moves to the left in FIG. 10, the stopper member 153 also moves to the left and abuts against the absorbing device 155. Since the 157 is pressed toward the stopper member 153, the piston 157 moves slightly to the left, and the shock of the stopper member 155 is softened.

When the work W is placed on the lower die 7 and the work holding ram 9 swings to lower the upper die 13 to clamp the work W,
In order to avoid an incomplete clamp, a height position adjusting device 777 that can adjust the height position of the lower mold 7 according to the thickness of the work W, for example, the change in the plate thickness of the plate material, is provided in the upper portion of the lower frame 3. It is provided on the front side. More specifically, FIG.
As shown in FIG. 2, FIG. 3, FIG. 11 and FIG. 12, a plurality of, for example, three drive units 165 of the height position adjusting device 77 are provided on the front side of the upper portion of the lower frame 3. As shown in FIGS. 1 and 2, each drive unit 165 has a connecting member 1
Connected at 67.

A pulley 169 is fitted to a connecting member 167, and a belt 171 is wound around the pulley 169 on the left side in FIG. 1 of the drive unit 165 provided at the front center of the upper portion of the lower frame 3. . A drive motor 173 is provided on the lower frame 3 below the drive unit 165 provided at the center of the front side.

On the left side of the drive motor 173 in FIG. 1, the drive motor 1
A pulley 175 is attached through the output shaft of 73. The belt 171 is wound around the pulley 175. When the drive motor 173 is driven, the central drive unit 165 is driven via the pulley 175, the belt 171, and the pulley 169, and the other two drive units 165 are also connected via the connecting member 167. The lower die 7 is driven and the height position is adjusted up and down.

The specific structure of the drive unit 165 will be described. In FIG. 11, the lower mold 7 is fixed to the lower frame 3 with a plurality of bolts 175. A hole 177 is formed in the left-right direction of the upper portion of the lower frame 3 in the front-rear direction FIG. A shaft 179 is mounted in the hole 177 so as to be rotatable in the left-right direction in FIG. In the lower frame 3 on the right side in FIG. 11 behind the hole 177, an opening 181 is formed that gradually opens to the upper right. In this opening 181,
A wedge member 183 screwed with a male screw portion and a female screw portion on the right side in FIG. 11 of the rear portion of the shaft 179 is mounted.

A support member 187 is provided on the left side in front of the shaft 179 in FIG. 11 via a bearing 185. The body 189 of the drive unit 165 is fixed to the left side of the support member 187 in FIG. 11 with a plurality of bolts 191 and the like.

A gear 193 is fitted to a shaft 179 inside the body 189. A gear 195 is meshed with the gear 193, and the gear 195 is mounted coaxially with the shaft of the pulley 169.

With the above configuration, when the gear 195 is rotated by the rotation of the pulley 169, the shaft 179 is rotated via the gear 193. For example, if the shaft 179 rotates clockwise,
The wedge member 183 screwed into the male screw portion at the rear portion of the shaft 179 with the female screw portion moves to the right in FIG. Wedge member 1
When 83 moves to the right in FIG. 11, the lower frame 3
The frame 3A on the upper side of the frame descends downward along the tapered surface of the wedge member 183. If the above operation is performed in reverse, the upper frame 3A of the lower frame 3 is lifted upward along the tapered surface of the wedge member 183. Therefore, the lower frame 3 moves up and down according to the thickness of the work W, for example, the change in the plate thickness of the plate material. That is, the height position of the lower die 7 is adjusted according to the change in the plate thickness of the plate material.

As shown in FIG. 12, pins 197 are provided on both outer sides of the drive unit 165 provided on both sides of the lower frame 3 between the upper frame 3A and the lower frame 3B via a wedge member 183. A spring 199 is provided on the pin 197. As a result of the movement of the wedge member 183, the upper frame 3A is lowered against the biasing force of the spring 199, and the spring 19
The upper frame 3A is lifted by the biasing force of 9.

In contrast to the lower stopper 73 for the reference alignment of the lower die 7 and the upper die 13 described above, the lower portion of the upper stopper 75 has a spherical seat 75A as shown in FIG. .

The operation of this embodiment will be described based on the flowchart shown in FIG.

In FIG. 14, the bending correction cylinder 69 is retracted at the second stage. It is judged whether it is a normal bend at the second stage. If there is a positive bend, the bend select cylinder 53 is turned ON for the forward bend at the second stage
Becomes If reverse bending, bend at the second stage Select cylinder
53 turns ON for reverse bending. Proceeding to the second stage, the work holding ram 9 is lowered by the main clamp cylinder 33, and at the second stage, the plurality of sub-clamp cylinders 35 are operated to pressurize the work holding ram 9 to remove the work W placed on the lower die 7. Upper mold 13
Clamp with.

At the second stage, it is judged whether or not it is forward bending, and if it is a forward bending process, the bending cylinder 61 is turned on at the second stage to raise the bending ram 49, and then the bending pressure cylinder 65 is turned on at the second stage to raise and correct. Bending is performed.

If it is determined that the reverse bending is performed in the second stage, the process proceeds to the next stage to turn on the bending cylinder 61 and lower the bending ram 49,
Next, at the second stage, the bending pressurizing cylinder 65 is turned on and lowered to perform reverse bending.

At the second stage, the bending correction cylinder 69 and the bending select cylinder 53 are once turned off.

Next, in the second stage, the bending correction cylinder 69 is turned on and operated to perform overbend. When the overbend is completed, it is judged whether or not the bending was normal bending in the second stage. If the bending is normal bending, the bending pressure cylinder 65 is turned off in the second stage.
At the second stage, the bending cylinder 61 is turned on and the bending ram 49 is lowered. In the case of reverse bending, the bending pressure cylinder 65 is turned off in the first stage, and the bending cylinder 61 is turned on in the second stage to raise the bending ram 49.

The sub clamp cylinder 35 is turned off at the second position, and the main clamp cylinder 33 is operated at the second position to move the work holding ram 9
Raise. It is judged whether or not there is a next bending step at the second stage, and if there is a next bending step, the feedback is made to the front of the next stage. If there is no next bending step, the process ends.

If the above-mentioned sequence of operations is performed incorrectly, mechanical interference may occur or a product may not be successfully produced.

The present invention is not limited to the above-mentioned embodiment,
It can be implemented in other modes by making appropriate changes.

(Effects of the Invention) As will be understood from the above description of the embodiments, according to the present invention, the swing centers of the work pressing ram and the bending ram are arranged on the same axis, and the work pressing ram and the bending ram are By arranging so as to swing independently of each other, there is an effect that manufacturing is easy and compact, and handling in operation is easier than in the past.

[Brief description of drawings]

1 is a front view of a bending machine in a swing type according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a right side view of FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a plan view of FIG. FIG. 6 is an enlarged view of a portion taken along the arrow VI in FIG. 3, and FIG. 7 is a view taken along the arrow VII in FIG. FIG. 8 is an enlarged view of a portion viewed from the arrow VIII in FIG. 3, FIG. 9 is an enlarged view of a portion viewed from the arrow IX in FIG. 3, and FIG. 10 is an enlarged view of a portion viewed from the arrow X in FIG. 11 is an enlarged sectional view taken along the line XII-XII in FIG. 1, FIG. 12 is an enlarged sectional view taken along the line XIII-XIII in FIG. 1, and FIG. 13 is a line XIV-XIV in FIG. It is an expanded sectional view which followed. FIG. 14 is a flow chart for explaining the operation of this embodiment. [Explanation of symbols showing main parts of the drawing] 1 …… Swing type bending machine 7 …… Lower mold, 9 …… Work holding ram 13 …… Upper mold, 19 …… Crank shaft 33 …… Main clamp cylinder 35 …… Sub clamp cylinder 45 …… Eccentric shaft, 49 …… Bending ram 51A, 51B …… Bending pushing member 53 …… Bending select cylinder 61 …… Bending cylinder 65 …… Bending pressure cylinder 69 …… Bending compensation cylinder 77… ... Height position adjusting device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Publication 1-17770 (JP, B2) Japanese Publication 1-6848 (JP, B2) Japanese Publication 60-31570 (JP, B2) Japanese Publication 5- 55207 (JP, B2) Actual public 56-6180 (JP, Y2) Actual public 2-17695 (JP, Y2) Actual public 2-48087 (JP, Y2)

Claims (2)

[Claims] 1. A work is placed on a lower die provided on an upper portion of a lower frame, and an upper die provided on a lower portion of a vertically movable work holding ram provided on the lower frame is the lower die. A work piece is provided so that it can be moved toward and away from the mold so that it can be clamped, and the work clamped between the lower mold and the upper mold is bent forward or backward with a bending ram that can swing vertically. A bending machine, wherein the swinging centers of the work holding ram and the bending ram are arranged on the same axis, and the work holding ram and the bending ram swing independently of each other. Bending machine 2. The bending machine according to claim 1, wherein the bending ram is supported by an eccentric portion having the same axis.