JPS6352715A - Bending machine - Google Patents

Abstract

PURPOSE:To automate the bending work by installing a bending angle and a pressing force measuring means for a workpiece and a storing means of characteristic curves and finding a required pressing force, etc., based on compar ison between a pressing force and a stored characteristic. CONSTITUTION:A bending pressing force measuring means 21, a bending angle measuring means 23, and a storing means 25 of bending angle-pressing force characteristic curves are installed in relation to a coining bending means 19 provided with a punch 7 and a die 9. A pressing force is found by the means 21 and a bending angle is measured by the means 23 based on a gap between the punch 7 and the die 9 at the time of coining bending. Then, the above pressing force and bending angle are compared with a stored data of pressing force-bending angle characteristic curves stored in a correction means 27 to find a required pressing force and stroke amount so that a workpiece W is again worked. The bending is automated because bending angles are automatically corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a workpiece bending machine, and more particularly to a bending machine that can automatically correct a bending angle in coining bending.

(Prior Art) In general, in the case of coining bending with a bending machine, the operator must perform trial bending to find out whether it is spring-in or spring-back.

Conventionally, when adjusting the bending angle in coining bending, the product is taken out after coining bending, the bending angle is measured, the plunger of the mold is adjusted based on the measurement results, and the product is bent again.

This operation was repeated to obtain a predetermined bending angle.

However, such a conventional procedure has a problem in that determining the bending angle of coining bending requires a lot of time and effort.

(Problems to be Solved by the Invention) The present invention has been made in view of such conventional problems, and an object thereof is to provide a bending machine that can automatically set the bending angle in coining bending. shall be.

[Structure of the Invention] (Means for Solving the Problems) The bending i:1 machine of the present invention includes a coining bending means, a bending angle measuring means for a workpiece, a bending force measuring means, and a bending angle-bending force measuring means. A storage means for a pressure characteristic curve, a bending angle of the workpiece by the bending angle measuring means, and a bending force applied to the workpiece by the bending pressure saw measuring means are stored in the bending angle.
Compare the bending force characteristic curve with the data stored in the storage means,
The apparatus is provided with a correction means for determining the bending force necessary to cover a predetermined bending angle and applying it to the slot 1 of the mold in place of the loaf between the NC1.

(Function) In the bending machine of the present invention, when a workpiece is bent between coining molds, the bending angle of the workpiece is determined, and the bending force is also measured and stored in the storage means. The bending force required to obtain a predetermined bending angle is determined from the data of the bending angle-bending force characteristic curve, and the mold stroke corresponding to the bending force obtained by 1q is converted. Coining bending is performed so as to correct the pressing force and obtain a predetermined bending angle.

(Example) FIG. 1 shows a press brake 1 as a bending machine, and this press brake 1 has an upper apron 3 and a lower apron 5 on the right side. A bunch 7 is placed below the upper apron 3, and a die 9 is placed on the -L side of the lower nib 5, f'j-IJ. Further, a back gauge 11 is installed at the back between the upper and lower bunches 7 and the die 9.

This press brake 1 has J5, bunch 7 and die 9.
Insert the work into the gap, abut the tip of the A against the C back gauge 11, raise the lower J-prong 5, press the work between the pan differential and the die 9, and bend the work.

A detection plate 15 is installed on the side surface of the frame 13 that supports the upper apron 3.
It moves up and down in conjunction with the lower apron 5, and a detector 17 detects the amount of movement of the lower apron 5 with respect to the upper apron 3.

Press a31 into such a press brake] innings = 3
− The bending system is described below.

As shown in FIG. 2, a coining bending means 19 for coining and bending the workpiece W between the pan def of the upper apron 3 and the die 9 of the lower gopron 5 has a bending pressure measuring means 21, A means 23 for measuring the bending angle of the butt work W is provided.

The storage means 25 stores data on the bending angle-bending force characteristic curve, and stores data on the characteristic curve as shown in FIG. The bending angle-bending force characteristic curve shown in FIG. This shows that a curve (y angle of 90 degrees) can be obtained by applying pressure.

In this characteristic curve, the bending force shown at the 0 point,
It is shown that coining bending can be performed at approximately 701~.

The correction means 27 reads data on the bending force and the bending angle Lσ from the bending force measuring means 21 and the bending angle measuring means 23, and calculates f of the bending angle-bending force characteristic curve stored in the storage means 25. - The bending pressure horn necessary to obtain a predetermined bending angle, for example 90 degrees, is determined by comparing the bending angles, for example, 90 degrees, and a stroke commensurate with obtaining this pressure J is given to the coining bending means 19.

Next, the operation of the coining bending system applied to the bending machine having the above configuration will be explained.

FIG. 4 is a flowchart of the operation of the coining bending system.

First, the lower apron 5 of the coining bending means 19, the die 9
Set the stroke of the hydraulic cylinder for lifting and lowering the T-abend so that it is n times the pressing force of the T-abend (n is generally 5) (step 51). has characteristic 4 as shown in FIG. Therefore, the detection plate 15 and the detector 17 detect the die 9.]
・Determine the loaf size and apply a predetermined pressure of 1q.

The coining bending means 19 in the fFX bends the workpiece W. Then, the gap between the punch 7 and the die 9 during this bending process is measured by the bending force measuring means 21, and the bending force is converted from the obtained gap opening (step 52).

As shown in FIG. 6, this gap opening-applying force characteristic curve is approximately expressed by the following equation, and by determining the gap opening, the bending pressurizing force can be easily calculated by 'J9! It is possible to calculate

Subsequently, the coining bending means 19 is depressurized,
The punch 7 is separated from the die 9, and the bending angle of the workpiece W is measured using a bending angle measuring means 23 such as a bending indicator (step 53).

Subsequently, the bending pressure horn and bending angle measurement values from the bending force measuring means 211 and the bending angle measuring means 23 are corrected by the correction means 27.
is given and compared with the bending angle-pressure force curve from the storage means 25 (step 54). In this comparison, the correction means 27 calculates the difference in bending force, and calculates the increment (decrement) of the stroke from the stroke-bending force characteristic curve shown in FIG.

This correction means 27 then applies an increment or decrement of stroke to one of the coining bending means.

The coining bending means 19 performs stroke control based on the information given from the correction means 27, and bends the workpiece W again (steps 55 and 56).

When this coining bending is completed, the pressure is released again and the bending angle of the workpiece W is measured by the bending angle measuring means 23, and it is determined whether the bending angle is within the allowable range for the desired bending angle (step 57). 58).

In this step 58, if the bending angle is not within the error range set by the parameter, for example ±10', the correction calculation of the pressing force is performed again from step 54, and the bending process is repeated using the target pressing force.

Conversely, if it is determined in this step 58 that the coining bending angle falls within the error range, this coining bending ends.

=7- In this way, the data of the bending angle-bending force characteristic curve is stored in advance in the storage means 25 in the NC device, the bending angle and the bending force are actually measured, and the data in the means 25 and the bending force are actually measured. This difference is calculated and the excess or deficiency of the pressurizing force is replaced with a stroke to automatically correct the bending angle.

Note that the present invention is not limited to the above 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 configuration, the bending angle can be automatically corrected and coining bending at a predetermined bending angle can be performed without performing trial bending as in the conventional case.

[Brief explanation of the drawing]

Fig. 1 is an overall view of a press brake used in an embodiment of the present invention, Fig. 2 is a block diagram of an embodiment of the invention, and Fig. 3 is a bending angle-bending force stored in a storage means. 4 is a flowchart explaining the operation of the above embodiment; FIG. 5 is a diagram showing a stroke-bending force characteristic curve; and FIG. 6 is a diagram showing a gap opening-bending force characteristic curve. It is. 1...Press brake 7...Punch 9...
Die 15...Detection plate 17...Detector 19...Coining bending means 21...Bending force measuring means 23...Bending angle measuring means 25...Storage means 27...Substitute for correction means Yasuo Miyoshi, Patent Attorney Figure 5 Figure 4 Figure 6

Claims (1)

[Claims] Coining bending means, workpiece bending angle measuring means, bending force measuring means, bending angle-bending force characteristic curve storage means, bending angle of the workpiece by the bending angle measuring means, and bending force measuring means The bending force applied to the workpiece by the means is compared with the data stored in the storage means of the bending angle-bending force characteristic curve, the bending force necessary to obtain a predetermined bending angle is determined, and the bending force is converted into the stroke of the mold. and correction means for controlling the stroke of the coining bending means.