JPS6336924A - Fractionally continuous obtuse angle bending system - Google Patents

Abstract

PURPOSE:To easily perform a fractionally continuous obtuse angle bending by automatically perform the fractional lifting of the lower part apron or upper part apron by a fractional lifting means on each a fixed time. CONSTITUTION:When a foot switch 21 is operated by abutting the tip of a work to an abutting member, the lower part apron 5 is ascended for the upper part apron 3, a die 9 reaches to the upper limit position and a 1st time obtuse angle bending is performed for the work. After the pass of the pre-given parameter value a motor is driven in succession, the upper limit valve is actuated and the lower part apron and die 9 are descended. After this descent of the lower part apron 5, a 2nd time gaging is performed and after the lapse of the set time, the motor is driven in the minus direction, the upper limit valve is turned OFF again, the lower part apron and die 9 are ascended again and a 2nd time obtuse angle bending is performed. The fractional continuous obtuse angle bending is performed by repeating the prescribed motion up to the designated times thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Industrial Field of Application) The present invention relates to a system for small continuous obtuse bending of workpieces in bending machines, such as press brakes.

(Prior art) For example, in a bending machine such as a press brake, when bending a workpiece so that it has a relatively large radius, small continuous obtuse angle bending is performed in which the workpiece is continuously bent at an obtuse angle while feeding the workpiece in small steps. will be carried out.

In the conventional system for continuous obtuse angle bending of such workpieces in small steps, the gauging positioning (axis positioning) of the backgauge device is first performed, and the die positioning for the bending machine in which the lower apron moves up and down relative to the upper apron. Positioning of the upper limit position (D-axis positioning) is performed. Thereafter, by stepping on the foot switch once, the workpiece is bent at a certain point at an obtuse angle, and the foot switch is released to lower the lower apron. Then, the L-axis positioning is performed again, the workpiece is fed by a certain amount, the foot switch is depressed again, and the next obtuse angle bending is executed. This operation is repeated.

However, such a conventional continuous obtuse angle bending system requires a foot switch to be turned on and off many times, which is time consuming and cumbersome.

(Problems to be solved by the invention) As mentioned above, in the conventional small continuous obtuse angle bending system,
There were problems in that it took a long time to bend and it was hot.

The present invention has been made in view of such conventional problems. For example, when the elevating means such as a foot switch is turned on -H, the upper limit position of the lower apron or the lower limit position of the upper apron is The setting value of the setting means is changed at regular intervals, and the lifting means of the lower apron or the upper apron is moved up and down in small increments to follow the set value, so that obtuse angle bending can be performed in small increments continuously. The purpose is to provide a small continuous obtuse angle bending system.

[Configuration of the Invention (Means for Solving Problems) The small continuous obtuse angle bending system of the present invention includes a lifting means for raising and lowering the lower nibron with respect to the upper apron, or raising and lowering the upper apron with respect to the lower apron. , means for setting the upper limit position of the lower nibron or the lower limit position of the upper apron by the elevating means, and lowering the lower apron by a predetermined distance downward from the upper limit position at predetermined time intervals when the elevating means is activated; The upper apron is raised and lowered in small steps for raising the upper apron upward by a certain distance from its lower limit position.

(Function) In the continuous obtuse angle bending system of the present invention, by operating the elevating means, the lower apron is driven to the upper limit position with respect to the upper apron, or the upper apron is driven to the lower limit position with respect to the lower apron. In this state, the lower apron or the upper apron is automatically raised and lowered in small steps at regular intervals using a small raising and lowering means.
Perform continuous obtuse angle bending on the workpiece.

(Embodiment) FIG. 1 shows a folding plate 1 like a press brake used in an embodiment of the present invention.

This folding trough 1 has an upper apron 3 and a lower apron 5. A punch 7 is installed below the upper apron 3, a die 9 is installed above the lower apron 5, and a plurality of bolts 1 are installed.
1 through a mold gripping member 13. This is with Pol 1-11 loosened, upper apron 3,
Alternatively, the lower apron 5 may be inserted from the right side, for example, and fixed by tightening the bolts 11 again at appropriate positions.

Front cover 17 with a tool stand 15 extending in the left-right direction
is provided on the Noh mask of the lower apron 5.

Mobile operation panel 19 and mobile foot switch device 21
The control unit 1 controls the raising and lowering of the lower apron 5 and the position of a back gauge device, which will be described later, through an NC device (not shown).

A back gauge 25 is provided in the workpiece processing space 23 between the upper nibron 3 and the lower nibron 5 of this bend 11, as shown in detail in FIG. The back gauge 25 includes a plurality of supports 27 protruding rearward near the left and right ends of the lower apron 5. A lead screw 31 driven by an electric motor 29 is attached to the support body 27.
A linear motion guide 33 is provided parallel to this.

A movable base 35 is provided above the lead screw 31 and the near motion guide 33. Left and right movable platform 35
．． A beam 37 is horizontally extended between the spacers 35 and 35, and its height can be freely adjusted by an elevating drive device 39.

This back gauge 25 is attached to the beam 37 so that it can be freely positioned left and right. An abutment member 41 is provided on the front surface of the bank gauge 25. The height of this abutting member 41 is determined by the lifting/lowering driving device 39 for the beam 37.

In addition, the positioning of the abutting member 41 in the front and back direction, that is, the L
The axis position method is performed by driving the lead screw 31 with the electric motor 29, and moving the movable base 35 against the linear motion guide 33.
This is done by moving back and forth.

When bending a workpiece using the bending groove 1 described above, the workpiece is first inserted into the processing space 23 and abutted against the end surface of the abutment member 41 of the back gauge 25. Then, by operating the operating panel 19 or the foot switch device 21, the lower apron 5 is driven up and down with respect to the upper apron 3, and the workpiece is clamped between the punch 7 and the die 9 to perform bending.

Note that these series of operations are automatically controlled by the NC device.

FIG. 3 shows a hydraulic/pneumatic circuit of a system that realizes small continuous obtuse angle bevels in such a bending val.

In FIG. 3, a main cylinder CL1 and a sub cylinder CL2. which drive the lower apron 5 are shown. Equipped with CL3. Pressure oil is supplied to the main cylinder C1 by a pump P via a main solenoid valve 5OL1. In addition, main cylinder CLI, sub cylinder CL2. It is also possible to supply pressure oil to Cl3 from the pump P via the speed switching valve 5QL2. Also, sub cylinder CL2. The line leading to CL3 has an upper limit valve V1. and Destroyer V2. A regulator RF is provided.

Distributor ■2 is air cylinder solenoid 5OL
Adjusted by 3.

Furthermore, this hydraulic pneumatic circuit also includes a check valve C■1.
~CV4, fill FIL, cutoff valve V3. Equipped with pressure gauge PG etc.

FIG. 4 shows a D-shaft section l] mechanism as a means for raising and lowering the upper limit valve (1) in small steps in the above-mentioned hydraulic/pneumatic circuit. This D-axis drive mechanism includes a feed screw 47 that is rotationally driven by a D-axis motor 43 via a variable speed gear train 45 . Four movers are screwed together with the feed screw 47,
A link 51 is connected to these four movers. A lever 53 is further connected to the link 51, and one end of the lever 53 serves as a position detection section for the lower apron 5, and the other end serves as an actuation section for the upper limit valve V1.

A leaf spring 55 is provided for the upper limit valve (1), and the valve operating portion of the lever 53 is in contact with this leaf spring 55.

Note that the limit switch SL is for overtravel on the plus side of the D-axis, and the limit switch LS2 is for overtravel on the minus side of the D-axis.

Next, the operation of the bending machine 10 using the hydraulic/pneumatic circuit shown in FIG. 3 will be explained. The lower apron 5 is raised by turning on the main solenoid valve 5OLI and supplying pressure oil from the pump P to the main cylinder CL1. By turning on the speed switching valve 5QL2, the speed is switched to low speed at the mute point and the binching point. The lower limit position of the lower apron 5 can be freely set by adjusting the on/off operation of the main tournoid valve 5QL10.

The upper limit valve (1) is normally off, and by turning on the upper limit valve (1), the pressure oil can be released and the lower nibron 5 can be lowered. Next, the operation of the upper limit valve (1) will be explained based on FIG. When the D-axis motor 43 is driven by an NC device (not shown) and the feed screw 47 is rotated to move the four movers in the positive direction, the valve operating portion of the lever 53 deflects the leaf spring 55. to operate the upper limit valve ■1. By operating this upper limit valve (1), the pressure oil in the hydraulic circuit is released, and the lower apron 5 is lowered.

Conversely, when the four movers are moved in the negative direction by rotation of the feed screw 47, the valve actuating part of the lever 53 releases the deflection of the leaf spring 55, turns off the upper limit valve V1, closes the hydraulic circuit, and closes the hydraulic circuit. 5 will be raised. When the lower apron 5 rises, the lower apron 5 presses the apron position detection part of the lever 53, and the valve operating part at the other end operates the upper limit valve (1) to stop the lower apron 5 from rising.

In this way, by rotating the D-axis motor 43 forward and backward and moving the movable element 49 in the positive or negative direction using the feed screw 47, the lower apron 5 can be raised or lowered near its upper limit position.

The operation of the small continuous obtuse angle bending system using such an axis control mechanism will now be described with reference to FIGS. 5 to 7. First, at timing T1, back gauge 2
The abutment member 41 of No. 5 is grouted, that is, L-axis positioning is performed. Then, as shown in FIG. 6, the lower apron 5 rises, and the D axis is positioned at the upper limit @D1 where the die 9 bends the workpiece W at an obtuse angle with respect to the punch 7 (step 101).

In this state, the tip of the workpiece W is abutted against the abutting member 41, and at timing T2, the foot switch 21
(step 102).

By this operation, the lower apron 5 rises relative to the upper apron 3, the die 9 reaches the upper limit position D1, and the first obtuse angle bending is performed on the workpiece W (step 103.
timing T3).

Subsequently, after a predetermined parameter value t1 seconds has elapsed, the D-axis motor 43 is driven at timing T4 to operate the upper limit valve V1 and lower the lower apron 5 and die 9 to D2 (step 105).

After the lower apron 5 is lowered, second gauging is performed at timing T5, and the set time t
2, the D-axis motor 43 is driven in the negative direction, the upper limit valve V1 is turned off again, the lower apron 5 and the die 9 are raised again, and the second obtuse angle bending is performed (steps 106 to 108). .

Thereafter, the operations of steps 104 to 108 are repeated up to a prespecified N number of times to perform continuous obtuse angle bending in small increments (step 109).

At timing Tm, after the bending is completed N times, the speed switching valve 5QL2 and the air cylinder tournoid valve 5OL3 are operated to lower the lower apron 5, and the lower apron 5 is lowered.
At the lowering position specified by device C, the main tournoid valve 5OL1 is turned off to stop lowering of the lower table 5 (steps 110, 111).

Subsequently, the foot switch device 21 is turned off, and the N small continuous obtuse angle bending operations are completed.

In the above embodiment, the foot switch device 21 is operated with the foot so as to be kept on during N bends. If it is turned on once,
It is also possible to set it to self-hold until the end of N consecutive facedowns. Furthermore, if the foot switch device 21 is turned off during N consecutive obtuse angle bends, the lower apron 5 can be set to make an emergency stop at that position.

This invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims.

[Effects of the Invention] Since the present invention has the above-mentioned configuration, the upper apron can be moved up and down by the small elevating means by a certain distance at certain time intervals while the elevating means is in the operating state, and the upper apron can be moved up and down by a certain distance at certain time intervals. can be easily implemented.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a folding rock used in an embodiment of the present invention, Figure 2 is a perspective view of a back gauge device used in the folding rock, and Figure 3 is applied to the folding style described above. A hydraulic and pneumatic circuit diagram of one embodiment of this invention, FIG. 4 is D of the above embodiment.
FIG. 5 is a flowchart illustrating the operation of the above embodiment; FIG. 6 is an explanatory diagram illustrating the upper limit position and gradual lowering position of the lower apron in the above embodiment; FIG. 7 is a mechanical diagram showing the shaft mechanism; is a timing chart explaining the operation of the above embodiment. 1... Bending machine 3... Upper apron 5... Lower apron 7... Punch 9... Die 25... Back gauge 41... Abutment member 43... D-axis motor 45 ... Variable gear train 47 ... Feed gear 49 ... Mover 51 ... Link 53 ... Lever 55 ... Temporary spring 21 ... Two foot switches Mid ... Electric motor 31. ...Lead screw 33...Linear motion guide 35...Movable base W...Work ■1...Upper limit valve CLl...Main cylinder O12, C10...Sub cylinder ■2...Distributor

Claims (4)

[Claims] (1) means for raising and lowering the lower apron with respect to the upper apron or the upper apron with respect to the lower apron; means for setting the upper limit position of the lower apron or the lower limit position of the upper apron by the raising and lowering means; and a small-step continuous obtuse angle bending system comprising: a small-step raising/lowering means for lowering the lower apron by a certain distance downward from its upper limit position, or for raising the upper apron by a certain distance upward from its lower limit position. (2) The small continuous obtuse angle bending system according to claim 1, wherein the elevating means drives a lower apron. (3) The small continuous obtuse angle bending system according to claim 1, wherein the elevating means drives an upper apron. (4) The elevating means is a hydraulic cylinder, the means for setting the upper limit position or the lower limit position is an upper limit valve or a lower limit valve for removing pressure oil from the hydraulic cylinder, and the small elevating means is configured to set the upper limit valve or the lower limit valve. 4. The small continuous obtuse angle bending system according to claim 1, wherein the actuator is repeatedly turned on and off at regular intervals.