JPH02104418A - Method and apparatus for following bending - Google Patents

Abstract

PURPOSE:To perfectly synchronize ram descending and the following apparatus by holding sheet shaped work to spring up outward when the sheet shaped work is V-bent through upper and lower sides, by controlling the descending speed of the upper die while restricting the ascending speed of a following lever. CONSTITUTION:As to be supporting method for the sheet shaped work to spring up outward through the following lever 81 restricting the descending speed of the upper die 8 while restricting by the ascending speed of the following speed constitutes a characteristic feature. As for this following method for bending, after setting the V-width of the lower die 9 according to the plate thickness of the work and bending depth in the V-groove of the lower die according to the bending angle, the following lever is turned centering around the outer peripheral edge. According to the ascended position of the following lever opening and shutting, an oil passage of a main cylinder 6 to control the descending speed of the upper die in the V-groove of the lower die constitutes the characteristic feature. By this method, because the descending speed of the ram 7 is restricted while regulating a flow rate of the lower limit setting valve 16, the descending of the ram and the following apparatus are perfectly synchronized.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a bending follow-up method for rotatably supporting an outwardly projecting portion of a workpiece when bending a sea-shaped workpiece in a press brake, for example, and Related to equipment.

[Prior art] The conventional bending follow-up method involves connecting the tip of the piston rod of a follow-up cylinder to a follow-up lever that supports the outwardly protruding portion of a sheet-like workpiece (hereinafter simply referred to as the workpiece) placed on a lower die. Then, when bending the workpiece due to the lowering of the upper die, the follower lever was rotated in the F direction by driving the follower cylinder.

However, as the workpiece is bent, it rotates around the outer edge of the lower mold, but the center of rotation of the follower lever cannot be attached directly to the outer edge of the lower mold, so there is a misalignment between the two centers. In addition, in order to prevent as much as possible scratches on the surface of the workpiece due to contact with the follower lever, the conventional follower cylinder is installed at an angle. Efforts have been made to match the rotational speed of the lever as much as possible.

[Problem to be solved by the invention] FIG. 4 is a diagram showing the relationship between the movement of the upper die and the workpiece.

When the upper die 8 descends and bends the workpiece 100 between it and the lower die 9, the lower limit of the upper die 8 is adjusted by the NG sub-control so that it touches the workpiece at point D, and the point roughly inside the V groove is adjusted. When stopped at E, F, and G, the workpiece 100 rotates around the outer edge K of the lower mold as the center of rotation. If the workpiece center d moves to e, f, and g, bends of 90", 60", and 30' will be made,
The workpiece jumps up. The following lever 81 is connected to the following cylinder 9
0, it is rotated via the piston rod 91 and a parallel link (not shown). The flip-up (rising) movement is performed by setting the cylinder 90 on the follow-up lever 91 inside the ship and moving it in an arc de.
Although it is designed to follow the trajectory fg, it is not synchronized with the movement of the ram, so instead of following this trajectory, a vertical line D' at a point D' inside the workpiece center d (closer to the center of rotation) It is necessary to consider the movement of -E'-F'-G'.

The requirement for perfect tracking is that when the tip of the upper mold 8 moves from D to E as described above, the point E' - F' - G' on the perpendicular line set at the point D' inside the center d of the workpiece 100 is In other words, it is necessary to rotate the follower lever 91 upward at a ratio of KD/KO'. The conventional tracking method is based on the idea that the workpiece should be followed to the extent that the workpiece does not buckle at the crook point, and the lowering speed of the upper die 8 is slowed down to approximately match the rising speed of the following lever. However, in the normal case, KD' /KD=150 tm/5sm=30
There is a double difference, and when the workpiece is 1# thick, the V width of the lower mold 9 is 6
Since it is #m+, it is 150/3 = 50 times, so
It is difficult to synchronize the movement of the follower lever with the descending speed of the upper mold 8, and therefore, a method of completely following the lowering speed cannot be realized.

An object of the present invention is to reverse the conventional concept of following and provide a method and apparatus for completely following the mold by restricting the lowering of the upper mold by the movement of the following lever.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for supporting a sheet-like workpiece that springs outward with a follow-up lever when bending the sheet-like workpiece with upper and lower molds. , the lowering speed of the upper die is controlled while being limited by the rising speed of the follower lever. In addition, in the above bending follow-up method, after setting the V width of the lower mold according to the workpiece plate thickness and the bending depth in the lower mold groove according to the bending angle, the follow-up lever is set around the outer edge of the lower mold. The main cylinder is rotated to open and close the oil passage of the main cylinder according to the raised position of the follower lever, thereby controlling the descending speed of the upper mold in the lower mold groove.

In addition, the bending follow-up device, which is a related invention of the present invention, is used in a device that bends a sheet-like work with an upper die at the lower end of the ram and a lower die placed on a bed, and is provided with an intermediary to the hydraulic circuit of the main cylinder for raising and lowering the ram. A lower limit setting pulp is installed and opened by an operating rod provided on the ram, an adjustment shaft installed horizontally behind the ram, an adjustment lever supported by the adjustment shaft via an eccentric disc, and the outside of the lower mold is rotated. A follow-up lever that rotates upward around the center, and a follow-up interlock that transmits the upward movement of the follow-up lever to the controller. It is characterized by having a means.

[Example] Next, the present invention will be specifically explained based on the drawings.

FIG. 1 shows a diagram of the principle of the present invention. In the figure, 1 is a hydraulic bonder, 2 is an oil passage, 3 is an oil tank, 4 is a relief valve,
5 is the frame of the bending rock, 6 is the main cylinder, 7 is the ram that is driven downward by the cylinder 6, 8 is the upper mold attached to the lower end of the ram 7, and 9 is the lower mold placed on the bed 11. , 1G is the V tM of the lower mold 9.

A lower limit valve 16 is attached to a beam 15 installed in contact with the ram, while a bracket 21 is used at the front end of the beam 15 to rotatably support an adjustment shaft 20 with an eccentric disc 19 inserted therethrough. The adjustment shaft 20 is inserted through the eccentric position of the eccentric disk 19 parallel to the longitudinal direction of the beam, and the adjustment lever 18 is supported on the outer periphery of the eccentric disk 19. The upper surface of the right side of the adjustment lever 18 faces the lower end of the plunger 17 of the lower limit setting valve 16, and the upper surface of the left side faces an adjustment screw rod (operating rod) 13 screwed into the bracket 12 on the rear wall of the ram. .

In the above apparatus, in order to bend the workpiece 100 between the upper die 8 and the lower die 9, oil from the pump 1 is sent to the main cylinder 6 via the lower limit valve 16 to pressurize the ram 7. As the ram pressurizes and descends, the operating rod 13 with an adjusting screw attached to the bracket 12 also descends at the same time, and the tip of the rod 13 pushes down the left side working surface of the adjusting lever 18. Rotate counterclockwise. Due to this rotation, the right side working surface of the adjustment lever 18 touches the lower end of the plunger 17, and by continuing to rotate, the plunger 17 is raised, so that the lower limit valve 16
is closed to stop the descent of the ram 7.

The effective quality of the operating rod 13 is determined when the tip of the upper die 8 and the upper surface of the lower die 9 are approximately at the same height (level A in Fig. 1).
'), adjust the length so that the lower limit setting valve 16 closes and stops. After adjusting in this way,
When the plate thickness setting means 30 (described later) in the commil roller 14 is activated and the adjusting shaft 20 is rotated counterclockwise by an amount corresponding to the workpiece plate thickness (1=A'-8'), the adjusting shaft 20 is integrated with one eccentric disk. Therefore, raise the adjustment lever 18 to position B.

When the ram 7 is lowered in this state, the tip of the upper mold 9 will stop when it presses the workpiece. After that, adjustment shaft 2
0 by rotating the adjustment shaft 20 clockwise to the lower limit setting position in conjunction with the following lever by the controller 14, the lever 18
The machine moves from position @ B to C, and the tip of the upper die moves to 1 in accordance with this.
The lower limit is from 3' to C'.

, the adjustment shaft 20 in conjunction with the rotation of the following lever as shown in E.
Since the lower limit setting valve 6 is opened and closed by varying the height position of the ram, it is possible to completely synchronize the lifting rotation of the workpiece due to the lower limit of the ram and the movement of the follower lever.

Next, FIG. 2 shows an implementation apparatus that is constructed entirely based on the principles described above. The figure shows only one corner of the ram; in the case of a press brake, the main cylinder 6, lower limit setting valve 16, operating rod 13 with adjustment screw, and adjustment lever 18 are provided in symmetrical positions. However, the other opening portion is not shown.

A tracking controller 14 is installed between the adjustment shaft 20 and the tracking lever 81. This controller includes an adjustment lever 18, a bending depth setting means 25, a plate thickness adjustment means 30, a vIiii setting means 50, and a follow-up interlocking means 60.
Contains. Next, each of these parts will be explained.

The adjustment lever 18 has an eccentric disc 19 rotatably fitted in the center of the lever, and an adjustment shaft 20 passes through the eccentric position of the eccentric disc 19, similar to that shown in FIG. One working surface of the lever 18 faces the operating rod 13, and the other working surface faces the plunger 17 of the lower limit setting valve 16. At the bottom of the lower limit setting valve 16, there is a first limit switch L that detects contact with the lever and switches the switching valve.
S1 is attached.

Bending depth step This step means 25 includes a dog 26 fixed to the adjustment shaft 20;
A screw rod 28 that determines the rotation end of the NC motor 27 and the dog 26, a converter 29 that converts the rotation of the NC motor 27 into forward and backward movement of the screw rod 28, and a second limit that detects the rotation end of the lever. It is composed of a switch LS2. The bending angle is determined by the width and bending depth selected depending on the thickness of the workpiece, and the descending depth from the upper surface of the upper die into the V-groove. When the bending depth is small, the clockwise rotation of the dog 26 is kept to a minimum as shown by the arrow in FIG.
Increase the rotation angle.

The bending depth is adjusted according to the thickness of the workpiece, even if the bending angle is the same, the bending depth is reduced when the thickness of the plate is small. 20 slightly clockwise to reduce the bending depth when the plate thickness is large, that is, adjust the adjustment shaft 2.
Rotate 0 to the left.

This plate thickness adjustment means 30 includes an arm 31 fixed to the adjustment@20, a bin 32 and a yoke 33 in the middle of the arm 31.
A screw rod 34 with left and right reverse threads vertically installed using
The main parts are an NC motor 35 for extending and retracting the screw rod and a corner 38 provided at the lower end of the screw rod 34.

A worm wheel 37 is provided in the center of the screw rod 34, and a worm 36 is fixed to the output shaft of the NC motor 35.
It's interlocking. At the bottom of the square shaft 38, the square shaft is the bin 32.
A slider 43 and a pair of rollers 44 that can move in a direction orthogonal to the square shaft 38 so as to be able to swing and move up and down around the
．． It is supported by 44. In addition, a vertical groove 39 is provided in the center of the square shaft 38, and a horizontal frame 65, which will be a part of the configuration of the follow-up interlocking member described later, is inserted into this vertical groove 39, and the piece 4 inside the horizontal frame 65 is inserted into the vertical groove 39.
1 is stopped by a bottle 40.

Further, a bottle 45 and a yoke 4 are provided at the tip of the arm 31.
6 is used to suspend an air cylinder 47 that operates according to the bending angle, and the lower end of the cylinder 47 is pinned to a bracket 49 protruding from a fixing member 48. This air cylinder 47 locks the arm 31 in its original position at the front when bending at 30° and 45°, and leaves it free when bending at 60° and 90°, restraining the rotation of the arm 31. It works to prevent this from happening.

V-width determining means According to the gluing width of the lower mold 9 determined by the work plate thickness and the bending angle, the position of the pair of rollers 44, 44 supporting the lower part of the square shaft 38 is moved in the horizontal direction, and the interlocking operation described later is performed. The distance 9 between the center of the driven gear of the means 60 and the bin 40 of the square axis is determined. When this distance 1 is determined, the vertical movement distance of the square shaft 38 during bending, that is, the rotation angle of the arm 31 is regulated.

The V width setting means 50 includes a motor 51, a gear 52 fixed to the motor output shaft, a screw 53 screwed onto a slider 43 disposed orthogonally at the bottom of the square shaft 38, and a wedge attached to the screw 53. It also includes a gear 54 that meshes with the gear 52. By rotating the motor 51 in the forward or reverse direction, the slider 43 supported by the guide 42 is moved left and right through gears and screws.

Follow-up Lever Mechanism A follow-up lever mechanism 80 including several levers that rotate synchronously is attached to the front part of the bending rock. Figure 2 shows the follower lever mechanism on the right side when viewed from the front of the machine.
Similar mechanisms located in the center and on the left side are not shown.

This mechanism 80 consists of a bracket 11 fixed to the front surface of the front plate 70 of the bending machine, a pantograph supported by the bracket 11, and a follower cylinder 90 for driving the pantograph. The bracket 71 is fixed to the front plate 70 using several bolts 72, and has upper and lower support shafts 86 and 87. The pantograph includes a following lever 811, vertical links 82 and 83 pinned to the lower part of the following lever 81, and a driving link 84 supported by the first support shaft 86.
It is made with a link 85 supported by a second support shaft 87. The lower part of the follower cylinder 90 is supported by a bracket 73 fixed to the front plate 70, and the yoke 92 at the tip of the piston rod 91 is fixed to the driving link 84. When the follower cylinder 90 is driven, the follower lever 81 in the pantograph rotates at a desired angle around the outer edge of the lower die 9 to follow the bending angle of the workpiece. In addition,
A pinion 62 of a follow-up interlocking means 60, which will be described below, is fixed to the opposite side of the first support shaft 86.

H2L1 The follow-up interlocking means 60 controls the movement of the follow-up lever 81 using the square shaft 38.
This is for converting in the vertical direction. The vertical movement of the square shaft 38 controls the lower limit setting valve 16 via the lever 31, the adjustment shaft 20, the eccentric disc 19J3, and the adjustment lever 18.

This interlocking means 60 consists of a rack par 61 arranged perpendicularly to the lower die 9 by opening a hole 75 in a front plate 70, and a rack par 61 fixed to a first support shaft 86 of the following lever mechanism 80. A pinion 62 that meshes with the front portion, a gear 64 that is fixed to a horizontal shaft 63 provided on the rear side of the front plate and meshes with the rear portion of the rack par 61, and a gear 64 that is attached to the end of the horizontal shaft 63 and that adjusts the plate thickness. 30, and a horizontal frame 65 connected to a square shaft 38.

The rack par 61 is normally placed on a guide 66 provided at the rear of the front plate so as to be able to float up and down, and is moved forward in the direction of the arrow by the rotation of the pinion 62 when the follower cylinder 90 is extended, and by the reverse rotation of the pinion when it is contracted. Return to original position. The horizontal frame 65 at the end of the horizontal shaft 63 is inserted into the vertical groove 39 of the square shaft 38, and the piece 41 is inserted into the long hole 67 provided in the horizontal frame 65.
The pieces 41 are connected to each other so as to be slidable and angularly rotatable around the support bin 40 of the piece 41.

A follow-up canceling means 55 is attached to the rear end of the follow-up interlocking rack par 61 for releasing the engagement between the follow-up gear r64 and the rack par 61 when the follow-up operation is not required. That is, this means 55 has a bar 56 protruding from the rear end of the rack par 61, a yoke member 59 is provided at the end of the piston rod of a cylinder 57 provided on the fixed member 48 using a pin 58, and this yoke member 59 is provided with a loose The bar 56 is inserted and supported.

When canceling tracking, the cylinder 57 is actuated to extend the piston rond, thereby pushing down the rack par 61 and causing it to engage with the gear 64.

Function Next, the function of the device shown in Fig. 2 will be described. First, without placing the workpiece on the lower die, lower the ram 7 and touch the tip of the upper die.
The origin is the level where the top surface of the lower mold matches. When the ram 7 is lowered near the level, the lever 18 is rotated counterclockwise by operating the operating rod 13 with an adjusting screw. This rotation causes the lower limit setting valve 16 to plunge!・Turn up 17 and close the circuit of the same valve to stop the ram. Let A be the eccentric position of one eccentric disk at this time. (Fig. 1) Next, the bending start position is set depending on the workpiece plate thickness. Meanwhile, the gear 37 is rotated by the small control motor 35, and the screw rod 34, which has opposite left and right threads, is expanded and contracted to rotate the arm 31 slightly counterclockwise or clockwise. When the arm 31 is rotated counterclockwise, the eccentric disc 19
When the A position becomes the 8th position, the center of rotation of the adjusting shaft 20 becomes higher, and when the timer is rotated in the 1 direction, it moves to the C position, where the center of rotation of the adjusting shaft 20 becomes lower (FIG. 1). This change in the vertical direction is made to correspond to the specified plate thickness t.

Furthermore, the position of one eccentric plate is set according to the gluing width of the lower mold 9 determined by the workpiece plate thickness and the bending angle.

When the horizontal frame 65 rotates when the follow-up interlocking mechanism 60 is activated,
The square shaft 38 moves up and down, but the F part is equipped with rollers 44, 44,
Lateral movement is restricted by the guide. Konoshi 1-
square shaft 3 by sliding the position of 44.44.
8 is laterally moved to adjust the vertical stroke of the angle @38 and change the eccentric position via the arm 31. That is, when the gears 52 and 54 are rotated by the small control motor 51, the slider 43 is slid in the front and rear direction by the screw 53, and the two rollers 4 provided on the slider 43 are rotated.
4.44, the angular shaft 38 moves in the horizontal direction, so the distance mρ between the horizontal shaft 63 and the bin 40 is increased or decreased. This movement is
The rotation angles of the following shaft 86 and the horizontal frame 65 are the same,
By changing the distance 1 between the horizontal frame 65 and the square shaft 38 by adjusting the gear 54, the following lever 8 shown in FIG.
The dimensions (DE, DF, DG in FIG. 4) at which the upper tip enters the V-groove of the lower die 9 can be set according to the seven widths corresponding to the rotation angle of 1. NC motor 2 in advance
7, the bending depth is set by adjusting the clearance between the tip of the screw rod 28 and the dog 26.

After setting the plate thickness, width 7, and bending depth as described above, place the workpiece 100 on the lower mold 9 and follower lever 81, and press down the drive pedal (not shown) to turn the switching valve 22. By switching, the ram 7 and the upper die 8
lowers and touches the workpiece.

At this time, the operating rod 13 pushes the lever 18, and the plunger 1
7 rises, the circuit of the lower limit setting valve 16 is cut off, and the ram 7 (stops).

At this time, the limit switch 181 is turned on, and the detection signal causes the follow-up cylinder 90 to operate and the follow-up lever 81 to begin to rise. At the same time, the cylinder 47 performs a return operation to rotate the arm 31 in the tt force direction as shown in FIG. As the arm 31 rotates, the center of the lever 18 moves from position Δ to C, so the circuit of the lower limit 32 constant valve 16 is activated, the ram 7 is driven, and the upper die 8 continues to bend at the lower limit. This movement changes the relationship shown in FIG. 1 to the horizontal frame 65.
The angular shaft 38 and slider 41 provide tracking and fully synchronous operation.

The operating speed V of the cylinder 47 for rotating the arm 31 is faster than the rising speed ■ of the following cylinder 90 (V<
V) Therefore, the bending speed extending from position Δ to C decreases while being limited by the follower shaft 86 that meshes with the rack bar 61. Final lowering limit of upper mold 8 (bending angle)
When the tip of the screw rod 28 hits the dog 26, the lower limit setting valve 16 closes and the ram stops, and at the same time, the limit switch is activated and the follow-up cylinder 90 is also stopped at the upper limit by S2. Then, by switching the switching valve 22, the ram 7 rises, and the follower cylinder 90 also returns.

Note that when the follow-up operation is not performed, the cylinder 57 is operated and the rack bar 61 is pushed down to release the engagement between the pinion 64 and the rack bar 61, thereby cutting off the synchronization.

In the illustrated example, the dog 26 and the arm 31 are separated, but they may be integrated into a crank lever type.

Further, the means for setting the plate thickness, the seven widths, and the bending depth are not limited to those shown in the drawings.

Furthermore, the tip of the follower lever 81 may be directly supported on both outer ends of the lower mold. In that case, as shown in Fig. 3, the support shafts 75 are attached to both ends of the lower mold at the point corresponding to the rotation center of the follower lever, and are fixed to the arms 88 extending forward of the follower lever 81. The pinion 89 is supported by the moeki support shaft 75, and the movement of the follower lever 81 directly supports the pinion 89.
9, it is possible to more accurately operate the interlocking means below the rack par 61.

[Effects of the Invention] As described above, according to the present invention, the descending speed of the ram is limited while adjusting the vl amount of the lower limit setting valve according to the valve speed of the follower lever, so that the lowering of the ram and the follower are controlled. Can be perfectly synchronized.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of the method of the present invention, Fig. 2 is a perspective view schematically showing an apparatus for carrying out the invention, Fig. 3 is a partial side view showing a modification of the following lever, and Fig. 4 is a conventional type. It is a figure which shows the bending motion locus of a following device and a sheet-like work. DESCRIPTION OF SYMBOLS 1...Hydraulic pump, 2...Oil path, 6...Main cylinder, 7...Ram, 8...Upper mold, 9...Lower mold, 13
...Operating rod with adjustment screw, 14...Controller,
16... Lower limit setting valve, 17... Plunge 17.
18...adjustment lever, 19...eccentric disc, 20...
Adjustment shaft, 22...Switching valve, 25...Bending depth setting means, 26...Dog, 30...Plate thickness setting means, 31...Arm, 34...Left and right reverse screw type Screw rod, 38... Square shaft, 43... Slider, 44
...Roller, 47...Air cylinder, 50...V
Width setting means, 51... Motor, 55... Follow-up canceling means, 57... Cylinder, 60... Follow-up interlocking means, 61... Rack bar 162... Binion, 63
...horizontal axis, 64...gear, 10...front plate, 80...
...Following lever ta side, 81...Following lever, 90.
...Following cylinder, 100...Work. Maru Machine Industry Co., Ltd.

Claims (1)

[Claims] 1. When V-bending a sheet-like work with upper and lower dies, in a method in which the sheet-like work that rises outward is supported by a follower lever, the upper die is moved while being limited by the rising speed of the follower lever. A bending tracking method characterized by controlling the descending speed of. 2. When V-bending a sheet-like workpiece with the upper and lower dies, in a method of supporting the sheet-like workpiece that rises outward with a follower lever, the width of the lower die and the bending angle are adjusted according to the thickness of the workpiece. After setting the bending depth in the lower die V groove, rotate the follower lever around the outer edge of the lower die, open and close the oil passage of the main cylinder according to the raised position of the follower lever, and bend the bending depth inside the lower die V groove. A bending follow-up method characterized by controlling the descending speed of an upper die. 3. The speed of the sheet-like workpiece placed on the lower mold is such that the lowering speed of the upper mold after the top end of the upper mold touches is smaller than the flow rate adjustment displacement speed of the lower limit setting valve of the main cylinder. bending tracking method. 4. In a device that folds a sheet-like workpiece using an upper mold at the lower end of the ram and a lower mold placed on a bed, it is installed in the hydraulic circuit of the main cylinder for raising and lowering the ram, and is opened and closed by an operating rod provided on the ram. The lower limit setting valve, the adjustment shaft mounted horizontally behind the ram, the adjustment lever supported by the adjustment shaft via an eccentric disk, the follow-up lever that rotates upward around the outside of the lower mold, and the rise of the follow-up lever. 1. A bending follow-up device comprising: a controller that adjusts the flow rate of a lower limit setting valve by changing the eccentric position of an adjustment shaft; and a follow-up interlocking mechanism that transmits upward movement of a follow-up lever to the controller. 5. The controller includes a means for setting the bending depth during V-bending, a plate thickness setting means for adjusting the eccentric position of the adjustment shaft according to the thickness of the sheet-like work, and a means for setting the bending depth during V-bending, and a plate thickness setting means for adjusting the eccentric position of the adjustment shaft according to the thickness of the sheet-like work. 5. The bending following device according to claim 4, further comprising means for setting a width determined by a bending angle.