JPH03165941A - Bending machine - Google Patents

Abstract

PURPOSE:To easily work a stock and to improve its working efficiency without remarking a cam by controlling the rotation of a driving means so that the cam rotates corresponding to the bent shape of the stock. CONSTITUTION:A CAD/CAM device 63 outputs a control signal for controlling the rotation of a servo motor 36 from a CPU to a driver 62 so that a push cam rotates corresponding to the bent shape of the stock 72. The driver 62 outputs a driving signal to control a position of rotation, a speed, a timing for bending the stock and a slider stroke to the respective servo motors 36A-36F of six bending slide units based on the control signal from the CPU.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bending machine, and more specifically, the present invention relates to a bending machine, and more specifically, a bending slide unit that includes a plurality of bending slide units each having a slider that moves linearly by a cam provided on a camshaft that moves rotationally. The present invention relates to a bending machine which, after feeding and punching materials such as wire rods and strips, performs bending in multiple directions by sequentially operating the bending slide unit at timing to produce products of desired shapes.

(Prior Art) A conventional bending machine using this type of bending machine is described in, for example, Japanese Patent Laid-Open No. 174223/1983. This molding machine is equipped with a bending machine, a mold, and a main feed device, and uses a large number of slides and molds that are sequentially operated by the bending machine to shape the material supplied from the main feed device. , bending).

The bending machine in the above-mentioned certain shape machine includes a slider that moves linearly, a base plate attached to the front plate of the bending machine,
Consists of a holder that is guided by a guide groove in the base plate and has a slider attached to it, a rotating roller that is rotatably supported by the holder, and a cam shaft that has a pinion gear at one end and a cam at the other end, and whose intermediate part is inserted into the base plate. The machine is equipped with a plurality of pending slide units and a sun gear rotatably supported in the center of the machine and rotated in one direction by an induction motor. Note that the pinion gear meshes with the sun gear, which causes the cam to rotate in only one direction. Also, the cam is always in contact with the rotating roller, and the slider rotates the cam (360 degrees).
degree), it makes one reciprocation according to the cam curve. By operating this slider, the material is bent by a predetermined amount at a predetermined location.

(Problem to be solved by the invention) However, in such conventional bending machines,
The cam only rotates in one direction, and the slider moves back and forth (finishing the product's bending) in one rotation (360 degrees), so we changed the product shape, such as the amount of bending of the material and the bending angle. In this case, it is necessary to recreate the cam each time, which is troublesome and increases costs, and the efficiency of the bending process deteriorates.

Furthermore, when inspecting the product shape and correcting the curved surface of the cam during test processing before mass production, it is necessary to remove the cam and perform correction processing, leading to the above-mentioned problems.

(Purpose of the Invention) Therefore, the present invention makes it possible to use a standard cam without having to remake the cam even when manufacturing products with different bending shapes or performing test machining, thereby reducing costs and improving machining efficiency. The aim is to provide a bending machine that can be improved.

(Means for Solving the Problems) In order to achieve the above-mentioned purpose, the bending machine according to the present invention has a base plate attached to the front part of the bending machine, a holder that is guided by the base plate and capable of linear reciprocating movement, and a holder that is locked to the holder and can move linearly. It is equipped with a plurality of bending slide units consisting of a reciprocating slider, a rotary roller rotatably supported by a holder, and a cam shaft having a cam at one end and a cam shaft inserted into a base plate in the middle, and the slider is moved along the curve of the cam. In a bending machine that bends a material by moving the camshaft according to a drive means capable of controlling rotation;
A control means is provided for controlling the rotation of the driving means so that the cam rotates in accordance with the bent shape of the material.

Further, the speed reducer is characterized in that it is a planetary differential type speed reducer, and the control means is constituted by a CAD/CAM device, and the CAD/CAM device performs programming according to the bending shape of the material, The rotation of the driving means is controlled by a control signal based on the programming, and the driving means is a servo motor or a stepping motor, and includes a feeding device having a material feeding means, The means is driven by a servo motor or a stepping motor, and the CAD/C
The rotation of the motor is controlled based on a signal from the AM device, and the press machine is arranged between the bending machine and the feeding device and presses the material, and the crankshaft of the press machine is , is rotationally driven by a motor via an electromagnetic clutch with a brake, and a controller of the electromagnetic clutch turns on/off the electromagnetic clutch based on a signal from the CAD/CAM device.

(Function) In the present invention, the rotation of the drive means is controlled based on the output of the control means and decelerated by the reducer, and the camshaft rotates, causing the cam to rotate. At this time, the slider moves according to the curve of the cam to is bent.

Therefore, by arbitrarily selecting the rotation of the cam, any product with a different bending shape can be processed using the standard cam, and test processing can also be performed by simply controlling the rotation of the drive means using the standard cam.

(Example) Hereinafter, the present invention will be explained based on the drawings.

1 to 5 are diagrams showing an embodiment of a bending machine according to the present invention. First, I will explain the precepts. FIG. 1 is a perspective view of one bending slide unit 1, and FIG. 2 is a sectional view of the bending slide unit 1. The bending machine of this embodiment is equipped with six such bending slide units 1. In these figures, 2 is a base plate attached to a front plate 3 as the front part of the bending machine, and a holder 4 is placed on the base plate 2 so as to be capable of linear reciprocating movement.
．． It moves while being guided by the guide plate 1 fixed by the guide plate 6. Note that 2a is a mounting groove that is engaged with the front @3 by a stopper (not shown). A slider 8 is fixed to the holder 4 with bolts 9, and the slider 8 itself functions as a punch to bend the material. Note that the present invention is not limited to this, and a processing punch may be engaged with the slider 8, and the material may be bent by the processing punch.

A plate 10 is attached to the other end of the holder 4 by bolts 1l, and a long hole 10a is formed in the plate 10, and a camshaft 12 is inserted into the long hole 10a.

The cam shaft 12 is engaged with the elongated hole 10a, and the play opening 0 moves along the elongated hole 10a. Further, a washer 13 is fixed to the end of the camshaft l2 by a hexagonal hole port 14. The camshaft 12 has a push cam l5 and a return cam 16, these cams 15. 16 is a bolt 18 attached to a mounting plate 17 fitted to the camshaft 12. 19, and rotate integrally with the camshaft 12. In this case, the rotational speed of the camshaft 12 is 10 to 2 ORPM. In addition, 20 is the installation vi. This is a distance piece interposed between 17 and plate 10.

The cam 15l6 has a rotating roller 21. 22 are engaged with each other, the rotary roller 2l is rotatably supported by the holder 4 by the bolt 23, and the rotary roller 22 is rotatably supported by the bolt 23.
4 is rotatably supported by the plate 10.

The push cam 15 moves the slider 8 when bending the material.
A standard cam is used as the push cam 15, and its planar shape is shown in FIG. 3. In FIG. 3, 17a represents a hole into which the mounting plate 17 is inserted, and 18a represents a hole into which a bolt 18 is inserted.

On the other hand, the return cam 16 is a so-called reverse-copying cam with respect to the push cam 15, and is used to mechanically control the slider 8 to return when the bending process of the material is completed. As shown in FIGS. 4(a) and 4(b), a reverse copying cam is a push cam 15 shaped to have a stroke P at an angle of +α, whereas a cam with the same stroke at an angle of 1α is used. It is like returning the cam l6 so that it becomes P and making the cam l6 look more imposing. Therefore, when considering a straight line that passes through the central axis of the camshaft 12 and connects the central axes of the rotating roller 2l and the rotating roller 22, the push cam 15 and the return cam 16 are The ribs will be shaped. Therefore, the rotation of the camshaft 12 causes the push cam l5 and the return cam 16 to rotate together, and at this time, the rotation roller 21 engages with the push cam 15, so that the holder 4, together with the slider 8, is pushed out in the direction of the material. On the other hand, when the rotating roller 22 engages with the return cam 16, the holder 4 is returned together with the slider 8 via the plate 10 in the opposite direction to the material.

That is, the slider 8 reciprocates in accordance with the rotation of the push cam 15 and the return cam 16 to bend the material.

Note that the return cam l6 and the rotating roller 22 are connected to the slider 8.
These are necessary when returning the system, but it is also possible to eliminate them. In this case, a spring may be provided that always urges the holder 4 toward the retracting side of the slider 8, so that the holder 4 is always pulled by this spring.

Therefore, this 11 is a type with only push cam l5.

The middle part of the camshaft 12 is inserted into the base plate 2, and
It is rotatably supported by two bearings 31 and 32. A shaft retaining ring 33 and a hole retaining ring 34 are arranged at the end of the bearing 32 to restrict movement of the camshaft 12.

On the other hand, a reducer 35 is connected to the other end of the camshaft 12, and the reducer 35 is of a planetary differential type (also referred to as an eccentric swing type), and one-stage reduction is achieved by a spur gear reduction mechanism. The two-stage reduction is performed using a planetary differential type reduction mechanism. A reduction ratio of 1/150 to 1/200 is possible.

The deceleration la 35 includes an input shaft 38 connected to an output shaft 37 of a servo motor (corresponding to a driving means) 36, three spur gears 39 that mesh with the teeth 38a of the input shaft 38, and three spur gears 39 connected to the spur gear 39. Crankshaft 40 and support block 41
A case 44 is fixed to the base plate 2, and a plurality of pins 45 are implanted on the inner circumference of the case 44 and form internal teeth. , has two external teeth 12 and a wheel 46 that engage with the pin 45 and have curved external teeth on the outer periphery. The crank portion of the crankshaft 40 and the external gear 46 engage with each other via a rolling bearing 50. The number of teeth of the external gear 46 is one less than the number of pins 45 that engage with the case 44 to form internal teeth. Further, the support block 41 is connected to the end portion 12a of the cam pongee 12 by a hexagon socket head bolt 47, and the rotation of the support block 41 is transmitted to the cam shaft 12. Reducer 35
The end (the left end in FIG. 2) is covered with a connecting plate 48, and the connecting plate 48 is fixed to the base plate 2 together with the case 44 by bolts 49. Note that 51 is a hole provided in the external gear 46, and there are three holes between the crankshafts 40, into which the pillar portion of the support block 41 is inserted. Further, the output shaft 37 of the servo motor 36 and the input shaft 38 of the reducer 35 are spline-coupled.

Therefore, the reducer 35 first receives the driving force of the servo motor 36 through the input shaft 38, then performs the first stage of deceleration using the spur gear 39, and then engages with the crankshaft 40 to rotate the external gear 46. A second-stage deceleration is performed by the included planetary differential mechanism, and this deceleration output is transmitted from the support block 1341 to the camshaft 12.

The servo motor 36 is connected to the connecting plate 4 by bolts 52.
8, and is rotated by a drive signal from a driver 62, which will be described later, and the number of rotations used is 2000 to 3000R.
A material of about PM is used. Further, the servo motor 3G is equipped with a position detector, and is configured to be able to feedback control its rotational position. Note that the driving means is not limited to the servo motor 36, and may be any device that can electrically control the rotation, for example, a stepping motor may be used.

A bending machine 60 includes a plurality of bending slide units 1 (six in this embodiment), and the overall structure of the large-sized machine including the bending machine 60 is shown in FIG. 5. In FIG. 5, the bending machine 60 is roughly divided into a main body 61, a driver 62, and a CAD/CAM device 6.
Consisting of 3. On the other hand, a press machine 64 and a feed device 65 are sequentially arranged on the right side of the bending machine 60 in the figure.
Together with the bending machine 60, these constitute a shaper 66. The press machine 64 has an induction motor 67, an electromagnetic clutch with a brake 14, 68, and a controller 69.
5 has a servo motor 7o and a driver 71. C A D / C A M (Computer
aided design & computer ai
The manufacturing device 63 has a function as a control means, and includes input devices such as a tablet and a keyboard, a floppy disk unit, arithmetic functions,
It is equipped with a graphic display device such as a CPU or CRT, which has a storage function and a control function, and an output device such as a printer, and processes the material 72 through computer processing.
It designs and drafts products using the material 72, and includes a product shape input system, a machine data creation system, and a drafting processing system as software.

Specifically, the CAD/CAM device 63 outputs a control signal from the CPU to the driver 62 to control the rotation of the servo motor 36 so that the push cam 15 rotates in accordance with the shape of the material 72 to be bent. is the drive unit to control the rotational position and speed of each of the servo motors 368 to 36F of the six bending slide units, the timing of bending the material 72, and the stroke of the slider 8 based on control signals from the CPU. Output a signal. Note that 73 is a mold that, together with the slider 8, bends the material 72.

Further, the CAD/CAM device 63 directly sends control signals for pressing the material 72 to the induction motor 6.
7 to control the rotation of the induction motor 67, and also output a control signal to the controller 69. The controller 69 controls the rotation of the induction motor 67 and the rotation of a crankshaft (not shown) that reciprocates the slide (not shown) in order to control the position when pressing the material 72, the timing of removing the press punch, etc. A drive signal is output to the electromagnetic clutch with brake 68 that operates and applies braking. Furthermore, CAD/
The CAM device 63 outputs a control signal to the driver 71 to control the feeding amount and feeding timing of the material 72.
1 outputs a drive signal to the servo motor 70 based on the control signal. The servo motor 70 rotates in response to a drive signal and drives a feed roller (not shown) that controls the feed of the material 72.

Next, the effect will be explained.

In FIG. 5, when a material 72 is repeatedly fed toward a mold 73 by a feeding device 65 at a predetermined feed amount each time, the material 72 is first punched by a press machine 64 (
For example, processing such as making a hole in a part) is performed, and then the mold 73 of the bending machine 6o is reached.

Next, although not shown, the cutting knife protrudes and cuts the material 72 between it and the cutting fixed table, and then the cutting cutter retreats, and the servo motor (for example, 36A) in one of the bending slide units l is activated. The slider 8 rotates in response to a drive signal from the driver 62, protrudes, bends the material 72, and retreats when the bending is completed. The other servo motors 36B to 36F sequentially rotate at a predetermined timing to perform a predetermined bending process on the material 72 to complete the product.

Here, the specific movement of the slider 8 in this embodiment will be explained with reference to FIG. 150~1/
The speed is reduced to about 200 degrees and transmitted to the camshaft 12. The rotation of the camshaft 12 causes the push cam l5 to rotate integrally, and at this time, the holder 4 pushes out the slider 8 as one in the direction of the material 72 via the rotating roller 21 that is in contact with the camshaft 15, and the curve of the push cam 15 The material 72 is bent by the slider 8 which moves in accordance with the following. Thereafter, the holder 4 is moved by the return cam 16 via the rotating roller 22 and the plate 10 so as to pull back the slider 8 integrally in the opposite direction to the material 72.

As described above, in this embodiment, standard cams are used as the push cam 15 and the return cam 16, and their rotation is controlled by the servo motor 3.
Therefore, by arbitrarily selecting the rotation, it is possible to process any product with a different bending shape using the standard cam.

To explain that the stroke can be changed even with one standard cam using Figure 3, in Figure 3, for example, if point P is the point of maximum retraction, then when changing the stroke amount at angle α of 18. By rotating the push cam 15 by a large angle β, the stroke amount can be increased. In addition, the point Q is the point of maximum attraction, and the angle T is the same as the angle α (α - γ)
If the push cam 15 is rotated by the same angle, the curved shape of the cam surface will be different even if the push cam 15 is rotated by the same angle, so that the stroke amount can be made different. In this way, by appropriately selecting the stroke start position and rotation angle using one standard cam, it is possible to arbitrarily change the bending shape of the product.

The crankshaft of the press machine was driven to rotate by the motor via an electromagnetic clutch with a brake, but the brake and electromagnetic clutch were provided separately, and the crankshaft was driven to rotate through them. Good too,
This does not depart from the spirit of the present invention. In this case, the brake is preferably operated in conjunction with an electromagnetic clutch.

In addition, the processing status of bending machines and press machines, such as bending angle, bending amount, presence of flaws, etc., is detected by sensors and monitored by CAD/CAM, and processing is fed back based on the monitoring results. If controlled, production management can be easily performed.

(effect) According to the present invention, the following effects can be obtained.

(1) Even when manufacturing products with different bending shapes, the standard cam can be used without having to remake the cam. Moreover, since the cam can be rotated forward and reverse, and its rotation can be selected arbitrarily, there is no need to create a large number of dedicated cams. Therefore, processing of the material is easy and efficient, and further, setup time is shortened and costs can be reduced.

(II) In test machining at an early stage before mass production, there is no need to remove the cam and modify the cam curve; instead, it can be handled by selecting a standard cam curve, and the same effect as described above can be obtained.

(Ill) Since the cam is reversible, there is no need for the cam to make one rotation (360 degrees) for one reciprocation of the slider.

20. Therefore, the rotation angle of the cam for one reciprocation of the slider can be arbitrarily selected, the machining speed can be increased, and the machining efficiency can be improved.

(IV) Multi-stage stroke (2 to 3 stages) operation of the slider can be easily performed by simply controlling the rotation of the servo motor, and various bending processes can be performed easily.

[Brief explanation of the drawing]

1 to 5 are views showing an embodiment of the bending machine according to the present invention, in which FIG. 1 is a perspective view of the bending slide unit, FIG. 2 is a sectional view of the bending slide unit, and FIG. 3 is a cross-sectional view of the bending slide unit. FIG. 4 is a plan view of the push cam, a diagram illustrating the shapes of the push cam and the return cam, and FIG. 5 is a diagram of the structure of the bending machine using the bending machine. 1...Bending slide unit, 2...
...Base plate, 3...Front plate, 4...Holder, 7...Guide plate, 21 4...Holder, 7... ...Guide plate, 8...Slider, 10...Plate, 12...Cam shaft, 15...Push cam, 16... Return cam, 17...Mounting plate, 21. 22...Rotating roller, 35...
・Reduction gear, 36... Servo motor (drive means), 37...
... Output shaft, 38 ... Input shaft, 39 ... Spur gear, 40 ... Crankshaft, 41 ... Support block, 42. 43... Bearing, 44... Case, 45... Pin, 46... External gear, 22 48... Connection plate, 60 ...Bending machine, 61... Main body, 62. 71... Driver, 63... CAD/CAM device (control means) 64
...Press machine, 65...Feeding device, 66...Form machine, 67...Induction motor, 68...
...Electromagnetic clutch with brake, 69...Controller, 70...Servo motor, 72...Material, 73...Mold. Agent Patent Attorney Gunichiro Ariga 23 Procedural Amendment Form Inkanhei 1/11/2016 Patent Application No. 1-304221 2. Name of the invention: Bending Machine 3, Relationship with the person making the amendment Patent applicant address: 1-9-1 Edobori, Nishi-ku, Osaka Name: Teijin Seiki Co., Ltd. 4, Agent: 151 Address: 2-6 Yoyogi, Shibuya-ku, Tokyo No. 9 5. "Detailed Description of the Invention" column of the specification to be amended. 6. Contents of the amendment (11. In the 9th line of page 10 of the specification, "as indicated.
The cam curve of the standard cam is based on the bending length of the most mass-produced product and takes into account the force acting on the cam and the speed and acceleration of the slider operation. It can be designed based on the relationship between the rotation angle and the stroke of the slider. (2) In the 15th line of page 18, the phrase "rotation is arbitrary" is corrected to "rotation is arbitrary." (3) On page 20, line 17 to line 18, the phrase ``depending on the selection of the curve of the standard cam'' is corrected to ζ ``depending on which part of the curve of the standard cam is selected''. Above 2

Claims (6)

[Claims] (1) A base plate attached to the front part of the bending machine, a holder guided by the base plate and capable of linear reciprocating movement, a slider locked to the holder and capable of linear reciprocating movement, a rotating roller rotatably supported by the holder, and one end The bending slide unit includes a plurality of bending slide units each having a cam and a cam shaft whose middle portion is inserted into a base plate, and by moving the slider according to the curve of the cam,
A bending machine that bends a material includes a reducer whose output part is connected to the other end of the camshaft, and whose output shaft is connected to the input part of the reducer, and whose rotation can be controlled. A bending machine comprising: a drive means; and a control means for controlling rotation of the drive means so that the cam rotates in accordance with the bending shape of the material. (2) The bending machine according to claim 1, wherein the speed reducer is a planetary differential type speed reducer. (3) The control means is constituted by a CAD/CAM device, the CAD/CAM device performs programming according to the bending shape of the material, and the rotation of the drive means is controlled by control signals based on the programming. The bending machine according to claim 1, characterized in that: (4) The bending machine according to claim 1, wherein the driving means is a servo motor or a stepping motor. (5) A feeding device having a material feeding means is provided, the feeding means is driven by a servo motor or a stepping motor, and the rotation of the motor is controlled based on a signal from the CAD/CAM device. Claim 3
Bending machine as described. (6) A press machine is arranged between the bending machine and the feeding device and presses the material, and the crankshaft of the press machine is rotationally driven by a motor via an electromagnetic clutch with a brake, and the electromagnetic clutch The controller of the CAD/CAM
4. The bending machine according to claim 3, wherein the electromagnetic clutch is turned on/off based on a signal from the device.