JPH06315722A - Method and device for controlling self bending in bending machine - Google Patents

Abstract

PURPOSE:To provide a self bending controlling method and device for a bending machine which can simply, precisely and automatically bend an undefined shape. CONSTITUTION:At the time of automatically bending a member to be bent 1 in a radius of curvature R with a channel roll bender 2, the radius of curvature R is shown with a length L of the arc within a prescribed range and a relative angle theta of the tangent at both ends, and the feeding amount and the bending amount of the member to be bent 1 are controlled corresponding to the change of the arc length L and the tangent relative angle theta following to the progress of the bending.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic bending control method and apparatus for a bending apparatus.

[0002]

2. Description of the Related Art Conventionally, there are pipe benders or shaped steel benders that can be bent automatically in a fixed shape, but parabolic shapes, S-shaped shapes, etc., such as the bending of shaped steel used for the frame of structures. There is no device that can automatically bend indeterminate objects. However, some data is required to automatically perform an indefinite bend, and the method for expressing that is to divide the curve into appropriate lengths and express the range as an arc of curvature as appropriate. However, if the radius of curvature of the arcs is gradually changed so that the connection between the adjacent arcs becomes natural, the whole can be approximately represented. However, there is no method to use that data for automatic bending, and when bending an indefinite shape such as a frame bender, there is only a method of operating the bending machine by using an inverse straight line or a mold and relying entirely on human intuition. .

[0003]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and an automatic bending control method and device for a bending apparatus capable of easily and accurately performing an indefinite automatic bending. The purpose is to provide.

[0004]

Therefore, in the present invention, in automatically bending a member to be bent to an appropriate radius of curvature by a bending apparatus, the radius of curvature is set within a range of arc lengths and tangents placed at both ends thereof. The relative feed angle of the bent member is controlled according to the change of the arc length and the tangential relative angle with the progress of bending, and the bending member is bent at an appropriate speed. An arc length detecting means and a tangential relative angle detecting means attached to a bending apparatus for performing machining, and an output of the arc length detecting means and the tangent relative angle detecting means are controlled to control a feed amount and a bending amount of a member to be bent. And a control device.

[0005]

When a circular arc is expressed, it is usually expressed by a radius of curvature, but it is not suitable for automatic bending data. Therefore, in the present invention, the automatic bending can be performed easily and accurately by using the data in which the arc is represented by the arc length and the tangent relative angle at both ends of the arc length.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment in which the automatic bending control method and device for a bending apparatus of the present invention is applied to a shaped steel roll bender. FIG. 1 is an explanatory view of the basic principle of this method.
2 is a diagram showing the control procedure of the present method, FIG. 3 is a block diagram of the present apparatus, FIG. 4 is a schematic diagram of the feed encoder in the above,
FIG. 5 is a schematic diagram of the angle encoder.

First, in FIG. 1, a shaped steel roll bender 2 for bending a bent member 1 of shaped steel is a feed roller 2
a and a bending pressure roller 2b, the bending pressure roller 2 while feeding the member 1 to be bent by the feed roller 2a.
When pushed and bent at b, the radius of curvature R gradually stabilizes and the loci coincide with each other even if the elastic limit is exceeded. The relative angle of the tangents placed at both ends of the arc length Lmm, that is, the opening angle of the arc is θ.
If it becomes °, the relation between L and θ is θ = 360/2
πR × L, which can be represented as shown in FIG. 2, and the length of the member to be bent 1 coming out from the bending pressure roller 2b is L.
If the bending degree is controlled so that the angle becomes θ until it becomes, the bendable member 1 can have the radius of curvature R.

Next, an apparatus for carrying out such a method is shown in FIG.
The feed roller 2a of the shaped steel roll bender 2 for bending the member to be bent 1 is provided with a feed actuator 3, the bending pressure roller 2b is provided with a bending actuator 4, and the feed roller 2a is also described. A feed encoder 5 for measuring the arc length L is arranged in front of the, and an angle encoder 6 for measuring the tangent relative angle θ is arranged in front of the bending pressure roller 2b. These feed encoder 5 and angle encoder 6
The control device 7 for controlling the feed actuator 3 and the bending actuator 4 according to the output of the moving amount command block 8 for instructing the angle amount according to the feed amount, and the feed encoder 5 and the angle encoder 6 for the command pulse. A servo control block 9 that controls the feed actuator 3 and the bending actuator 4 so that the feedback pulses become equal, a data receiving unit 10 that receives data from the personal computer 12, and a sequence processing unit 11 that performs signal processing from the operation panel 13. It consists of

As shown in FIG. 4, the feed encoder 5 is provided with a length-measuring roller 14 that is in contact with the member 1 to be bent and attached to the shaft thereof.
A spring 15 is attached to press the whole encoder so that 4 always contacts the member to be bent 1. Further, as shown in FIG. 5, a magnet 16 is attached to the shaft of the angle encoder 6 so as to be fixed to the member to be bent 1, and the angle encoder 6 is attached to a slide table 18 mounted on a Y-axis rail 17. In addition, the Y-axis rail 17 is on the X-axis rail 19,
When the bent member 1 moves, the angle encoder 6 main body can move without changing the angle.

In such an apparatus, for example, the arc length is 3
If you want to bend the range of 00 mm with a radius of curvature of 5000 mm,
Tangent relative angle at both ends of the arc θ ° = 360 ° × 300 / 2π
× 5000 = 3.44 °, and it is only necessary to bend the bent member 1 so that the tangent line relative angle becomes 3.44 ° while feeding the bent member 1 by 300 mm.
The data of ° is entered in the control device 7. Then operation panel 1
When the start operation is performed by 3, the sequence processing unit 11 sets the angle detection mechanism and monitors the feed amount and the angle change. Next, the movement amount command block 8 sends a feed amount pulse at a timing for sending the bent member 1 at an appropriate speed based on the data, and an angle amount pulse according to the feed amount to the servo control block 9, and the feed actuator 3 and The bending actuator 4 is actuated to control the feed amount and the bending amount of the member to be bent 1, so that the member to be bent 1 is bent with an arc length of 300 mm in a radius of curvature of 5000 mm.

[0011]

In summary, according to the present invention, when automatically bending a member to be bent to an appropriate radius of curvature by a bending apparatus, the radius of curvature is set within a range of arc lengths and the relative angles of tangents placed at both ends thereof. The bending amount is controlled by controlling the feed amount and the bending amount of the member to be bent according to the change of the arc length and the tangential relative angle with the progress of the bending process and feeding the member to be bent at an appropriate speed. An arc length detecting means and a tangential relative angle detecting means attached to the bending apparatus; and a control device which receives the outputs of the arc length detecting means and the tangential relative angle detecting means and controls the feed amount and the bending amount of the member to be bent. Since the present invention provides an automatic bending control method and device for a bending apparatus capable of easily and accurately performing an indefinite automatic bending, the present invention is extremely useful industrially.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a basic principle in an embodiment in which an automatic bending control method of a bending apparatus of the present invention is applied to a shaped steel roll bender.

FIG. 2 is a diagram of a control procedure of the method.

FIG. 3 is a block diagram of an apparatus for implementing the method.

FIG. 4 is a schematic diagram of a feed encoder in the above.

FIG. 5 is a schematic diagram of an angle encoder.

[Explanation of symbols]

 1 Bent member 2 Shaped steel roll bender 2a Feed roller 2b Bending pressure roller 3 Feed actuator 4 Bending actuator 5 Feed encoder 6 Angle encoder 7 Controller 8 Moving amount command block 9 Servo control block 10 Data receiving unit 11 Sequence processing unit 12 PC 13 Control panel 14 Measuring roller 15 Spring 16 Magnet 17 Y-axis rail 18 Slide table 19 X-axis rail

Claims (2)

[Claims] 1. When automatically bending a member to be bent to an appropriate radius of curvature by a bending apparatus, the radius of curvature is expressed by the length of a circular arc in a certain range and the relative angles of tangents placed at both ends thereof, and the progress of bending is performed. Along with the above, an automatic bending control method for a bending apparatus, characterized in that the feed amount and bending amount of a member to be bent are controlled according to changes in the arc length and the tangential relative angle. 2. An arc length detecting means and a tangential relative angle detecting means, which are attached to a bending apparatus for performing bending while feeding a member to be bent at an appropriate speed, and the arc length detecting means and the tangent relative angle detecting means. An automatic bending control device for a bending apparatus, comprising: a control device that receives an output and controls a feed amount and a bending amount of a member to be bent.