JPH0262332B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a workpiece bending angle detection device for a press machine.

Conventionally, when bending is performed using a press brake, air bending is often used in which the bending angle can be changed over a wide range from not only a right angle but also an acute angle to an obtuse angle, depending on the stopping position of the mold.

This processing method has the advantage of requiring much less bending pressure than the general bottoming method, but it is difficult to produce products with high precision.
For this reason, efforts are being made to improve the precision of products using CNC, etc., but there are many factors related to the bending angle that are difficult to grasp, and because the control is open, it is difficult to continuously flow uniform and highly accurate products. has not been reached yet.

This invention detects the bending angle of a workpiece by accurately grasping the bending angle of the workpiece being bent by a press machine during processing and feeding back this information, thereby making it possible to supply products with higher precision. The purpose is to provide a device.

Next, embodiments of the invention will be described with reference to the drawings.

Fig. 1 is a side view of the punch section and die section to which the workpiece bending angle detection device of the present invention is attached;
The figure is a front view. A die 3 is provided below the punch 1, a workpiece W is placed between them, and two arms 5 and 7 of equal length are placed on the engagement line between the punch 1 and the die 3.
One end is pivotally attached to the punch 1 at points a and d, respectively, and the other end is attached to the rod-shaped work contact 9 at points d, respectively.
It is pivoted at points C and C. Pivot points a, b, c,
d is arranged to form a parallelogram. A pivot at point a is fixed to the arm 5 and is rotatable relative to the punch 1 as the arm swings, and a pulley 11 is fixed to this pivot. The pulley 11 is connected to the pulley 13 of an encoder 17 by a belt 15, and the output of the encoder 17 is displayed as an angle by a counter.

As shown in Fig. 1, place the workpiece W on the die 3,
When the die is raised and the workpiece W is brought into contact with the lower end P of the punch 1 and the lower end S of the workpiece contactor 9 and bending is performed from this position, the workpiece W is bent into a V-shape.
Let angle S′PS be θ (S′ will be described later). At this time, the lower end S of the workpiece contactor 9 is pushed upward and moved obliquely upward by the arms 5 and 7 parallel to the vertical engagement line of the punch 1 and die 3 to the position 9'.
The lower end S is at the position S'. At the same time, the arms 5 and 7 are at positions 5' and 7', respectively, and rotated from their original positions by the same angle as the angle θ by which the workpiece W is bent. This rotation angle is determined by pulleys 11 and 1, respectively.
3. It is transmitted to the encoder 17 by the belt 15, and the output of the encoder 17 is displayed in angle by a counter.

As is clear from the above description, according to the present invention, it is possible to supply highly accurate products by accurately grasping the bending angle of the workpiece during the bending operation and feeding back the obtained angle to the processing operation. It is meant to be.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, in which FIG. 1 is a side view of the punch section and the die section, and FIG. 2 is a front view of the same. 1 is a punch, 3 is a die, 5 and 7 are both arms,
9 is a work contact, 11 and 13 are both pulleys,
15 is a belt, 17 is an encoder, 19 is an intermediate plate, a, b, c, and d are pivot points, P and S are the punch 1, the lower end of the workpiece contactor 9, and W is the workpiece.

Claims (1)

[Claims] 1 On the vertical engagement line between the punch and die of the press machine, one end of each arm of two equal lengths is pivotally connected to the punch side, and the other end is pivotally connected to the workpiece contactor, and these A workpiece bending angle detection device for a press machine, in which points form a parallelogram and one pivot on the punch side is provided with means for detecting a swing angle.