JPH0347692Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to a mute point determining device in a bending machine such as a press brake.

(Prior art) For example, in a bending machine such as a press brake,
In the relative bending motion between the punch and die,
The punch approaches the workpiece at a relatively high speed, and when a predetermined distance is reached, that is, when the distance point is reached, the punch is switched to a low speed and slowly approaches the workpiece. Furthermore, when the punch contacts the workpiece, that is, when the pinching point is reached, NC control is performed to switch to a slower bending speed.

Conventionally, in such a bending machine, an operator makes a judgment and specifies a meute point or a pinch point by inputting a key into an input means of an NC device.

However, in this case, when the worker determines the point or pinch point by inputting keys based on his/her own judgment, unless the worker is an experienced worker, he or she cannot set the point appropriately, which may result in a smooth bending process. I had a problem that I couldn't solve.

(Problems to be solved by the invention) As mentioned above, the conventional bending machine's measuring point and pinching point determining device requires the operator's skill, and the measuring point can be determined easily and reliably automatically. It was hoped that a point determining device would emerge.

This invention was made in view of such conventional problems, and provides a meuto point determination device that can easily and reliably automatically determine meuto points without relying on the experience of the operator. The purpose is to

[Structure of the invention] (Means for solving the problem) The mute point determining device of this invention is based on the width V of the die, the angle DA, the thickness t of the workpiece, the tip angle PA of the punch, and the diameter of the tip radius. PR, an input means for calculating the die depth a from the inputs V and DA, a calculation means for calculating the punch tip retraction dimension b from the inputs PA and PR, and a clearance c as an input or parameter. The clearance setting means to be given and the above-mentioned values a, b, c, and t are added to obtain the Miyuto point Pm (=a+b+t+c)
and addition means for determining.

(Function) In the mute point determination device of this invention, the width V of the die, the angle DA, the thickness t of the workpiece, the tip angle PA of the punch, and the diameter PR of the tip radius are used as input information, and the die Determine the depth a, calculate the punch tip retraction dimension b from the input information PA and PR regarding the punch, and set these values a,
The miute point Pm is automatically determined by adding b, c, and t.

(Example) FIG. 1 shows the entire press brake 1 as an example of a bending machine. This press brake 1
has an upper apron 3 and a lower apron 5. A punch 7 is fixed below the upper apron 3, and a die 9 is fixed above the lower apron 5 with a plurality of bolts 11 via mold gripping members 13, 13, respectively. This is done by inserting the upper apron 3 and the lower apron 5 from, for example, the right side with the bolts 11 loosened, and fixing them by tightening the bolts 11, 11 at appropriate positions.

A front cover 17 having a tool stand 15 extending in the left-right direction is provided on the front surface of the lower apron 5.

A movable operation panel 19 and a movable foot petal device 21 are used to issue commands to raise and lower the lower apron 5 and to control the position of the back gauge. This operation panel 19 is connected to an NC device (not shown), and can be used to perform various necessary inputs and control the operation of the machine.

When bending a workpiece using the press brake 1, first insert the workpiece by a predetermined distance between the punch 7 of the upper apron 3 and the die 9 of the lower apron 5, and then press the workpiece against the upper apron 3. The lower apron 5 is driven and the work piece is clamped between the punch 7 and the die 9 to perform bending.

An embodiment of a miute point determination device for such a press brake 1 is shown in FIG. This miute point determining device is incorporated into the NC device (not shown) of the press brake 1. FIG. 3 explains the meanings of the punch point Pm and pinch point Pp of the punch 7 and die 9 of the press brake 1. The punch 7 moves relative to the die 9 and descends at a fast speed from above as shown in FIG. 3a. Then, as shown in FIG. 5B, when the robot reaches the miute point Pm, the descending speed is slowed down and the robot approaches the workpiece W at a leisurely speed.
Then, when the workpiece W is slightly in contact with the workpiece W, as shown in FIG. This is what we do.

Returning to FIG. 2, the input means 23 corresponds to the operation panel 19, and inputs the workpiece shape, bending order, etc.
Mold information and various other necessary information are input by key input and other necessary operations. The input information by this input means 23 includes the punch 7, the die 9, and the workpiece W as shown in FIGS. 4 to 6.
The following input information is included regarding:

As for the punch 7, as shown in FIGS. 4 and 5, the angle PA of its tip 25 and the diameter PR of the tip radius, as for the die 9, as shown in FIG. 4, the width V and the groove angle DA. , As for the workpiece W, the thickness is t, and the clearance is c. This clearance c may be designated by the input means 23, or may be set as a parameter by an appropriate calculation means using information on the workpiece W, punch 7, and die 9 as parameters.

The calculation means 27 regarding the die depth a determines the die depth a as a function of the input information V and DA regarding the die 9 using the formula a=f(V, DA).

The calculation means 29 for the retraction dimension b of the punch calculates the retraction dimension b of the punch tip 25 based on the formula b=f(PA,PR) using the information PA and PR regarding the tip 25 of the punch 7 as a function. It is something.

The addition means 31 inputs the die depth a from the calculation means 27, the retraction dimension b of the punch from the calculation means 29, and the thickness t of the workpiece W from the input means 23.
Take the clearance c as input and add these. That is, the miute point Pm is determined by the formula Pm=a+b+t+c.

The addition means 31 also includes a pinching point Pp
The thickness t of the work W from the input means 23 and the die depth a from the die depth a calculation means 27 are respectively taken in, and the pinching point Pp is calculated by the formula Pp=a+t-0.1.

In this way, the Miyuto point determining device receives information from the input means 23 and the arithmetic device 27,
Based on the calculation results regarding the die depth a and the punch retraction dimension b from 29, the miute point is determined.
Pm and pinching point Pp can be automatically determined.

In this way, the miute point Pm and the pinching point Pp obtained by the addition means 31
is given to the NC device as control information, and based on this information, the speed of the relative movement between the punch 7 and die 9 is controlled.

In addition, in the above embodiment, the pinching point Pp
We have also explained the determination of the points, but the gist of this invention is to automatically determine the points.
This does not necessarily have to involve automatic determination of the pinching point Pp. In addition, this invention is not limited to the above embodiments,
Various modifications are possible within the scope of the technical idea stated in the claims for utility model registration.

[Effects of the invention] Since this invention has the above-mentioned configuration, it is possible to easily and reliably automatically determine the meute point without requiring the experience of the operator as in the past.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a press brake used in an embodiment of this invention, Fig. 2 is a block diagram of an embodiment of this invention, and Fig. 3 shows the point between the punch and the die. and a side view illustrating the definition of the pinching point; FIG. 4 is an explanatory diagram illustrating various input information regarding the punch and die;
FIG. 5 is an enlarged view of section A in FIG. 4, and FIG. 6 is an explanatory diagram showing the pinching point determination operation. 1...Press brake, 7...Punch, 9...
die, 23...input means, 27...die depth calculation means, 29...punch retraction dimension calculation means,
31... Addition means, Pm... Miyuto points,
Pp...Pinching point, W...Work.

Claims (1)

[Scope of utility model registration request] Die width V, angle DA, workpiece thickness t,
means for inputting the tip angle PA of the punch and the diameter PR of the tip radius; a calculation means for calculating the die depth a from the inputs V and DA; and a calculation means for calculating the retraction dimension b for the tip of the punch from the inputs PA and PR. clearance setting means for giving the clearance c as an input or parameter, and each of the numerical values a, b, c,
Add t and get Miyuto point Pm (=a+b+
t+c).