JP3171660B2 - Processing control device for bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of bending a plate material into a uniform cross-sectional shape in the bending length direction such that the plate material is sandwiched between an upper die attached to an upper table and a lower die attached to a lower table. And a processing control device for a bending machine.

[0002]

2. Description of the Related Art In order to bend a plate material into a V-shaped cross section, the plate material is placed on a lower die having a V-shaped groove, and an upper die having an acute-angled tip portion is inserted into a lower V-shaped groove. This is performed by entering a predetermined dimension. That is, the lower surface of the plate material comes into contact with the left and right shoulders of the lower V-shaped groove, and the central portion of the plate material is bent into the lower V-shaped groove by the tip of the upper die. The bending angle is determined according to the size of the protrusion of the tip of the upper die with respect to the left and right shoulders. At the time of this bending operation, the upper table and the lower table receive a pressing reaction force from each other via a plate material interposed between the upper mold and the lower mold, so that the upper table and the upper mold and the lower table and the lower mold are vertically moved. A slight deflection occurs in the direction.

[0003]

The amount of deflection of the upper and lower tables themselves is not uniform in the bending width direction of the plate material.
Since the vicinity where the plate material is interposed is larger than the vicinity where no plate material is present, the lower surface of the upper table and the upper mold deforms concavely when viewed from the front, and the upper surface of the lower table and the lower mold deforms concavely when viewed from the front. Since this bending reduces the amount of protrusion of the upper die with respect to the lower die, the bending angle becomes larger than a desired value, and the bending angle does not become a uniform cross-sectional shape in the bending width direction of the plate material. Therefore, it is necessary to eliminate the concave deformation due to the bending of the upper and lower tables themselves and to maintain the upper table and the lower surface of the upper die, and the upper surfaces of the lower table and the lower die linearly in the bending width direction of the plate material.

In order to maintain the upper table, the lower surface of the upper die, and the upper surface of the lower table and the lower die linearly in the direction of the bending length of the plate, the following deflection correction structure is generally employed.

In the first structure, for example, a large number of upper and lower two wedges are arranged and arranged between an upper table and an upper mold mounting bracket, for example.
This wedge is adjusted at each position in the bending length direction to correct the vertical position of the upper die mounting bracket.

In the second structure, for example, in a bending machine having a structure in which the left and right portions of the lower table are raised and lowered by left and right table lifting cylinders, the left and right central lines of the lower table are sandwiched between the left and right central lines. This is one in which a deflection correction cylinder is arranged. According to this, since the left and right deflection correcting cylinders act to bend upward in the vicinity of the center of the lower table in a convex shape, the concave deformation of the upper surfaces of the lower table and the lower mold is caused by the concave deformation of the lower table. The straight line between the lower table and the upper surface of the lower mold is maintained by being offset by the convex deformation.

When the upper table and the lower table are bent upward and downward over the bending length direction, bending is performed near both ends of the bent length of the bent plate near the center of the bent length. Because the angle is large, the bent plate material does not straighten in the bending length direction at the front and rear edges, but the center of the bending length is open to the front and back with respect to both ends of the bending length bent. Therefore, during the bending process, the operator visually observes this bending or distortion in the bending length direction of the front and rear edges of the plate material, and determines the magnitude of the bending of the upper table and the lower table, The wedge is adjusted or the operating pressure of the deflection correction cylinder is adjusted.

However, the adjustment of the wedge or the operation pressure of the deflection correcting cylinder requires a great deal of trouble. That is, in the first structure, a series of operations of adjusting the wedge after trial-bending the plate material and once releasing the pressure, and then adjusting the wedge are repeated many times, resulting in an excessive number of steps.

Further, in the second structure, it is possible to visually check the bending or distortion in the bending length direction of the plate material during the bending process and adjust the operating pressure of the deflection correcting cylinder during the pressing. However, since the operation of adjusting the operating pressure value relies only on the experience of the operator, in order to perform accurate bending in actual work in which the processing specifications such as bending angle and bending length are various, A lot of trouble is required.

An object of the present invention has been proposed in view of the above-mentioned problems of the prior art. If a processing specification such as a bending angle and a bending length is input, a bending force required for this processing and an upper table are required. Another object of the present invention is to provide a bending machine devised so that an appropriate processing condition such as a correction cylinder pressure for correcting deflection of a lower table is automatically selected and the bending machine is controlled.

[0011]

In order to solve the above-mentioned problems, according to the present invention, one of an upper table to which an upper die is attached and a lower table to which a lower die is attached are provided on both sides of the one table. Is moved up and down by the table elevating cylinder, whereby the upper and lower dies are configured to bend the plate material into a uniform cross-sectional shape over its bending length direction. Symmetrically, a bending correction cylinder is provided for correcting bending in the vertical direction of the upper table and the lower table during the bending operation, and the table lifting cylinder is connected to the fluid pressure generator via a pipe. Connecting the table elevating cylinder via piping,
In addition, an adjustment valve is provided in the middle of the pipe and an adjustment valve is provided in the middle of the pipe, and the pipe is branched at another pipe from the pipe to connect the deflection correction cylinder, and is branched at another pipe from the pipe. In a bending machine in which a deflection correction cylinder is connected and a pressure regulator is provided in the middle of the pipe and a pressure regulator is provided in the middle of the pipe, processing such as bending angle and bending length in bending is performed. Data input means for inputting specifications and processing conditions such as bending force required to achieve this processing specification, cylinder pressure for correction of deflection of the upper table and lower table, and the above processing specifications and processing conditions And a storage unit storing a bending length and a correction cylinder pressure corresponding to each bending pressure, for each value of each bending pressure, and storing the data from the data input means in the storage unit. When a new bending pressure and bending length for the next bending process that has not been performed are input, the new bending pressure, bending pressure close to the bending length, bending length, and correction cylinder pressure are stored in the memory. The new cylinder pressure for correction is calculated by a proportional equation based on the stored data called out from the storage unit, a new bending pressure is calculated based on a new bending length, and a new bending pressure is calculated. A control unit for controlling the processing of the bending machine so as to adjust the pressurizing force with an adjusting valve and adjust the new correction cylinder pressure with a pressure regulator. Machine processing control device.

[0012]

When the bending operation is performed, the processing specifications such as the bending angle and the bending length are not stored in the storage unit from the data input means, and when a new bending pressure and a new bending length for performing the next bending are input. The new bending pressure, the bending pressure close to the bending length, the bending length, and the correction cylinder pressure are called from the storage unit, and based on the called storage data, the control unit creates a new one. Correction cylinder pressure is proportional
It is calculated by The table lifting cylinder adjusts the adjustment valve to bend the plate with the new bending force, and the deflection correction cylinder adjusts the pressure adjustment valve to operate with the new correction cylinder pressure, and the upper table, The lower table is corrected and deformed, thereby canceling the vertical deflection of the upper table and the upper mold and the lower table and the lower mold caused by the pressurized reaction force received by the upper table and the lower table from the plate material. The lower surface of the upper die and the upper surfaces of the lower table and the lower die are kept linear in the bending length direction of the plate material, and the plate material is bent into a uniform cross-sectional shape in the bending length direction. As a result, in actual work in which the processing specifications such as bending angle and bending length are various, accurate bending can be easily achieved without requiring special experience and skill.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a front view of a press brake which is a bending machine, FIG. 3 is a side view thereof, and FIG.
FIG. 5 is a perspective view of the press brake, and FIG. 5 is a perspective view of the press brake.

An upper table 5 is fixed to the upper part of the left and right side plates 1, 3 which are the machine frames of the illustrated press brake.
A lower table 7 is provided below. The lower table 7 can be moved up and down by left and right table elevating cylinders 9 and 11 coupled to the side plates 1 and 3. An upper die 13, for example, a punch, is detachably fixed to the upper table 5 via an upper die mounting bracket 15, and a lower die 17, for example, a die, is a lower die mounting bracket 19 on the lower table 7.
It is removably fixed via.

The lower table 7 is provided with correction cylinder support plates 21 and 21 in the front and rear directions in FIG. 2, and the lower table 7 and the correction cylinder support plates 21 and 21 are connected by left and right connection pins 23 and 25. are doing. In FIG. 2, notches 27 and 29 are provided in the correction cylinder support plates 21 and 21 at positions symmetrical with respect to the center line of the lower table 7 in the left-right direction (the bending length direction of the plate material W) to provide deflection correction. Cylinder 31,3
3 so as to straddle the notches 27 and 29, and deflect the cylinders 31 and 33 for correction to the cylinder support plate 2 for correction.
1, 21 and the lower edge 7a of the lower table 7 is
The piston rods 35 of the deflection correcting cylinders 31, 33,
37 supports from below.

Pressure fluid is supplied to the table elevating cylinders 9 and 11 from the fluid pressure generator 39 composed of, for example, a pump and a pressure accumulating tank via the regulating valves 41 and 43 and the pipes 45 and 47, and the deflection correcting cylinders 31 and 11 are supplied. The pressure fluid of the fluid pressure generator 39 is adjusted to be reduced (or increased) at a fixed ratio by the pressure control valves 49 and 51, for example.
3, 55.

The regulating valves 41 and 43 and the pressure control valves 49 and 51
As shown in FIG. 1, all of the electromagnetic actuators 41a, 43a, 4 such as an electromagnetic solenoid or a motor, for example,
The opening and closing operation is controlled by 9a and 51a, and the fluid pressure supplied to the table lifting cylinders 9 and 11 and the deflection correcting cylinders 31 and 33 can be adjusted.

Spherical recesses 57a, 59a are formed at the upper ends of the piston rods 57, 59 of the table elevating cylinders 9, 11, and support seats 61, 63 are attached to lower left and right sides of the lower table 7, respectively. The spherical projections 61a, 63a formed at the lower ends of the
The bearings 7 and 59 are supported by spherical concave portions 57 a and 59 a, and the piston rods 57 and 59 and the support seats 61 and 63 are connected by bolts 65 and 67. This allows the lower table 7 to be slightly inclined with respect to the table lifting cylinders 9 and 11.

With the above configuration, the deflection correcting cylinder 3
For example, when the piston rods 35, 37 are protruded, the upper edge of the lower table 7 near the center in the left-right direction (the bending width direction of the plate material W) in FIG. The projecting deformation amount becomes the largest value near the joint with the piston rods 35 and 37. In the bending operation by the operation of the table lifting cylinders 9 and 11, the upper table 5 and the lower surfaces of the upper mold 13 and the lower table 7 and the lower table 7 are pressed by the pressing reaction force received by the upper table 5 and the lower table 7 from the interposed plate material W. The upper surface of the mold 17 is concavely deformed, but can be canceled out by the convex deformation of the lower table 7.

The above bending machine is controlled by the configuration illustrated in the block diagram of FIG. In this configuration, processing specifications such as bending angle and bending length in bending,
Bending force (fluid pressure to be supplied to the table elevating cylinders 9 and 11) required to achieve this processing specification,
A storage unit M for storing processing conditions such as a correction cylinder pressure (a fluid pressure to be supplied to the deflection correction cylinders 31 and 33), and a storage unit based on a processing specification input from the data input unit I described below. There is provided a control unit C for retrieving the processing conditions stored in M and controlling the table lifting cylinders 9 and 11 and the deflection correction cylinders 31 and 33, respectively, based on the processing conditions.

A data input means I for manually inputting processing specifications and processing conditions into the storage section M by, for example, an operator;
Data display means D for displaying input data, data in the storage unit M, and the like on a screen are provided in this configuration.

The storage unit M and the control unit C can be constituted by a microcomputer 61, for example, and the data input means I
Is, for example, a keyboard, and the data display means D is, for example, C
It can be configured by RT. Table lifting cylinder 9,1
The fluid pressure supplied to 1 is detected by the pressure sensors 71 and 73 and input to the control unit C.

An example of a method for storing and organizing data such as processing specifications and processing conditions in the storage unit M is schematically illustrated in FIG. That is, using the bending force (fluid pressure to be supplied to the table elevating cylinders 9 and 11) necessary for processing to a certain bending angle as a parameter, the bending length and the bending length are set for each bending force value. , The correction cylinder pressure (the fluid pressure to be supplied to the deflection correction cylinders 31, 33)
They are stored in a matrix.

Because of the limitation on the capacity of the storage unit M, the stored values of the bending force, the bending length, and the correction cylinder pressure are limited. It is assumed that the control unit C calculates a typical value based on the stored value by, for example, a proportional equation. For example, the bending length is 500 mm and the bending pressure is 7
When Ton, the cylinder pressure for correction is 20 kg / cm ² , the bending length is 1000 mm, and when the bending pressure is 15 Ton, the cylinder pressure for correction is stored as 30 kg / cm ² . When the operator inputs a bending length of 750 mm and a bending pressure of 10 Ton from the data input means I, the control unit C determines the correction cylinder pressure at this time as ｛(20 + 30) × 750 / (500 + 100).
0) + (20 + 30) × 10 / (7 + 15)｝ ÷ 2 = 2
After calculating 3.86 kg / cm ² , the operation of the pressure control valves 49 and 51 supplies the deflection fluid to the deflection correcting cylinders 31 and 33 at the pressure of the correcting cylinder pressure.

According to the above configuration, when the operator inputs the processing specifications such as the bending angle and the bending length from the data input means I during the bending operation, the table elevating cylinders 9 and 11 can be operated.
The bending pressure, which is an appropriate fluid pressure to be supplied to the cylinder, and the correction cylinder pressure, which is an appropriate fluid pressure to be supplied to the deflection correction cylinders 31 and 33, are stored in the storage unit M by a command from the control unit C. Automatically selected and called. At this time, the input processing specifications such as a bending angle and a bending length, and the processing conditions called out from the storage unit M such as a bending pressure and a correction cylinder pressure are displayed on the data display means D.

The controller C adjusts the fluid pressure from the fluid pressure generator 39 to the bending pressure by the regulating valves 41 and 43 and supplies the bending pressure to the table elevating cylinders 9 and 11. The pressure is reduced (or increased) at a fixed ratio by the supply pressure control valves 49 and 51, for example, and adjusted to the correction cylinder pressure.
To supply.

The table lifting cylinders 9 and 11 bend the plate material W by the bending force, and the deflection correcting cylinders 31 and 33 operate by the correcting cylinder pressure to correct the upper table 5 and the lower table 7. Deform,
The vertical bending of the upper table 5 and the upper mold 13 and the lower table 7 and the lower mold 17 that occur at the time of bending are offset to each other,
Lower surface of upper table 5 and upper mold 13 and lower table 7
The upper surface of the lower mold 17 is kept straight in the bending length direction of the plate material W. During the bending operation, the bending pressure, which is the fluid pressure in the table lifting cylinders 9, 11 detected by the pressure sensors 71, 73, is stored in the storage unit M by operating the data input means I by the operator. Can be memorized. The operator also operates the data input means I to determine the correct cylinder pressure, which is the appropriate fluid pressure to be supplied to the deflection correction cylinders 31 and 33.
Can be stored.

Next, the operation of the above embodiment will be described. Lower mold 1
When the operator inputs the processing specifications such as the bending angle and the bending length on the plate material W from the data input means I, the bending pressure and the correction cylinder pressure are called from the storage unit M, and the left and right tables are read. The pressurized fluid of this bending pressure is supplied to the lifting cylinders 9 and 11, and the piston rod 5
7, 59 is operated to protrude. The upper mold 13 protrudes into the V-shaped groove of the lower mold 17 by a predetermined dimension, the lower surface of the plate material W contacts the left and right shoulders of the V-shaped groove of the lower mold 17, and the center of the plate material W is the upper mold. 13 is bent into the V-shaped groove of the lower die 17 by the tip of the lower die 17.

The left and right deflection correcting cylinders 31, 3
3 is supplied with a pressure fluid having the cylinder pressure for correction,
The piston rods 35 and 37 are protruded, and the upper edges of the lower table 7 near the center in the left-right direction (bending length direction of the plate material W) are protruded upward and deformed. At the time of this bending operation, the upper table 5 and the lower table 7 are deflected in the vertical direction by the pressing reaction force received by the interposed plate material W on the upper table 5 and the lower table 7. The upper surface of the lower mold 7 and the lower mold 17 are concavely deformed, but the concave deformation due to the pressing reaction force is reduced by the convex deformation of the upper surface of the lower table 7 and the lower mold 17 due to the above operation of the right and left deflection correcting cylinders 9 and 11. Thus, the linearity of the upper table 5, the lower surface of the upper die 13, and the linearity of the lower table 7 and the upper surface of the lower die 17 are maintained. Thereby, the bending angle of the plate material W becomes uniform over the entire width in the bending length direction.

In the above-mentioned prior art, a series of operations of adjusting the wedge after trial-bending the plate material, once releasing the pressure, and then adjusting the wedge have a problem that the number of operations becomes excessively large. In addition, since the operation of adjusting the operating pressure value of the deflection correction cylinder during pressurization relies solely on the experience of the operator, the actual operation with a wide variety of machining specifications such as bending angles and bending lengths, There was a problem that a lot of trouble was required to perform the bending process,
According to the above-described embodiment, accurate bending can be easily achieved without requiring special experience and skill in actual work in which processing specifications such as a bending angle and a bending length are various.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes. For example, in the bending machine shown in FIG. 2, the upper table 5 is fixed and the lower table 7 moves up and down. The lower table 7 is fixed, and the upper table 5 is moved up and down by a table elevating cylinder. Correction cylinder to upper table 5
Can be applied without any trouble to the bending machine having the structure provided on the side of. Regarding the control configuration, in addition to the specific example shown in FIG. 1, various known detectors for automatically detecting the bending angle and the amount of protrusion of the upper die and inputting them to the control unit are provided in the bending machine. You can do it.

[0032]

As described above, according to the present invention, when a bending operation is performed, a new bending force and a new bending length which are not stored in the storage unit from the data input means by the operator and are to be bent next. Is input, the new bending pressure, the bending pressure close to the bending length, the bending length, the correction cylinder pressure are called from the storage unit, and the control is performed based on the called storage data. The new cylinder pressure for correction is calculated by the proportional equation . The table lifting cylinder adjusts the adjustment valve to bend the plate with the new bending force, and the deflection correction cylinder adjusts the pressure adjustment valve to operate with the new correction cylinder pressure, and the upper table, The lower table is corrected and deformed, thereby canceling the vertical deflection of the upper table and the upper mold and the lower table and the lower mold caused by the pressurized reaction force received by the upper table and the lower table from the plate material. The lower surface of the upper die and the upper surfaces of the lower table and the lower die are kept linear in the bending length direction of the plate material, and the plate material is bent into a uniform cross-sectional shape in the bending length direction.

Thus, in actual work in which machining specifications such as a bending angle and a bending length are various, an accurate operation can be performed by a simple operation of inputting the machining specifications without special experience and skill. Bending can be easily achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the configuration of the present invention.

FIG. 2 is a front view of a press brake to which the embodiment is applied.

FIG. 3 is a side view of the press brake of FIG. 2;

FIG. 4 is a sectional view taken along the line III-III in FIG. 2;

FIG. 5 is a perspective view of the same press brake.

FIG. 6 is an explanatory diagram showing an example of the contents of a storage unit in the configuration of FIG. 1;

[Explanation of symbols]

 Reference Signs List 5 upper table 7 lower table 9, 11 table elevating cylinder 13 upper die 17 lower die 31, 33 deflection correcting cylinder W plate I data input means M storage unit C control unit

Continuation of the front page (56) References JP-A-3-165932 (JP, A) JP-A-62-267018 (JP, A) JP-A-1-233016 (JP, A) JP-A-60-180622 (JP, A) JP-A-62-45425 (JP, A) JP-A-2-70814 (JP, U) JP-B-52-5644 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB Name) B21D 5/02 G05B 13/02

Claims (1)

(57) [Claims] 1. Either an upper table (5) to which an upper mold (13) is attached or a lower table (7) to which a lower mold (17) is attached is a table lift provided on both sides of one of the tables. The cylinders (9) and (11) are moved up and down to thereby bend the plate (W) between the upper die (13) and the lower die (17) into a uniform cross-sectional shape in the bending length direction. A bending correction cylinder (31) for correcting the bending of the upper table (5) and the lower table (7) in the vertical direction during the bending operation, symmetrically with respect to the center of the one table in the left-right length. ), (33) to connect the table elevating cylinder (9) to the fluid pressure generator (39) via a pipe (45) and the table elevating cylinder (11) via a pipe (47). And the piping (4
An adjusting valve (41) is provided in the middle of 5) and the piping (4
7) A regulating valve (43) is provided in the middle of the pipe (45).
The pipe is further branched from another pipe (53) to connect the deflection correction cylinder (31), and the pipe (47) is branched from another pipe (55) to connect the deflection correction cylinder (33). In a bending machine provided with a pressure regulator (49) in the middle of the pipe (53) and a pressure regulator (51) in the middle of the pipe (55), a bending angle and a bending in the bending process are provided. Processing specifications such as processing specifications such as length, bending pressure required to achieve the processing specifications, and cylinder pressure for correction of deflection of the upper table (5) and the lower table (7) are input. A data input means (I) and a storage unit (M) for storing a bending length and a correcting cylinder pressure corresponding to each bending pressure for each bending pressure among the processing specifications and processing conditions.
And inputting a new bending pressure and bending length which are not stored in the storage unit (M) from the data input means (I) and which are to be subjected to the next bending process. A bending pressure, a bending length, and a correction cylinder pressure close to the above are called from the storage unit (M), and a new correction cylinder pressure is calculated by a proportional expression based on the called storage data. And the bending force is calculated based on the new bending length, the new bending force is adjusted by the adjusting valves (41) and (43), and the new correction cylinder pressure is adjusted by the pressure regulator (49). A control unit (C) that controls the processing of the bending machine to adjust in (51).
And a machining control device for a bending machine.