JP2011083800A - Bending press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bending press in which the effects of the springback of a workpiece to be bent and the deflection of a press frame are measured and corrected. <P>SOLUTION: In the bending press, the upper die 30 has a plurality of notches 31 in the longitudinal direction, a measuring sensors 50 are provided in the notches 31, a lower die 40 comprises a plurality of small lower dies 40a-40e which are lined up in the longitudinal direction and adjusting mechanisms 60 for adjusting the height of the small lower dies 40a-40e are provided. A workpiece W is not hidden with the upper die 30 and the bending angle is measured in the vicinities of the bending positions. The effect of the deflection of the press frame 10 is measured from the bent cross-sectional shape in a plurality of regions in the longitudinal direction. By adjusting the height of the small lower dies 40a-40e, both effects of the springback of the workpiece W and the deflection of the press frame 10 are corrected. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bending press. More specifically, the present invention relates to a bending press including a measurement sensor that measures a bending angle of a workpiece such as a steel plate to be bent.

  In order to satisfy the demands for weight reduction and energy saving in mobile structures such as automobiles and vehicles, structural plate materials are becoming thinner and stronger, and development of higher strength high strength steel sheets is progressing. This high-tensile steel plate has a large spring back during processing such as bending and drawing, and it is difficult to obtain processing accuracy. In particular, in the case of a long plate, the bending angle is different at each part in the longitudinal direction of the plate material due to the influence of the bending of the press frame, or warpage occurs in the longitudinal direction. Therefore, a bending press has been devised that includes a measurement sensor for measuring the bending angle of a workpiece to be bent and corrects the influence of such a spring back and press frame deflection.

The bending press described in Patent Document 1 as an example thereof is one in which a bending angle detection means is provided on a support plate provided integrally with a ram. This bending angle detection means mainly comprises a rotary encoder, a follower bar provided on the rotary encoder, and a follower plate provided perpendicular to the follower bar.
When the plate material is bent by this bending press, the tracking plate is held horizontally and brought into contact with the lower surface of the plate material so that the tracking plate rotates together with the plate material as the plate material is bent. Since the follower bar also rotates as the follower plate rotates, the bending angle of the plate material can be detected by detecting the rotation angle of the follower bar with a rotary encoder.

  However, since the bending angle detecting means is fixedly provided at one place in the center of the press, there is a problem that the influence of the bending of the press frame cannot be detected and corrected.

  Therefore, the bending press described in Patent Document 2 is provided with a non-contact type angle measuring device that is movable in the longitudinal direction of the mold on the front and rear surfaces of the lower mold. By comprising in this way, it is possible to measure the bending angle of the desired position in the longitudinal direction of a board | plate material.

  However, as shown in FIG. 10, the angle measuring device 150 measures from the front and rear surfaces of the lower mold 140, and thus measures the portion of the plate material W that is not hidden by the lower mold 140 in a spot manner. is there. Therefore, when the thickness of the lower mold 140 is large, the plate material W is hidden behind the lower mold 140, and the bending angle near the bending position cannot be measured. Especially in the case of sequential bending, if the interval between the bending positions is narrow, another bend may enter between the bending position to be measured and the point measured by the angle measuring device. There is a problem that the bending angle cannot be measured.

Japanese Patent No. 2667184 JP-A-10-118718

  SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a bending press that can measure and correct the effects of spring back of a workpiece to be bent and bending of a press frame.

A bending press according to a first aspect of the present invention is a bending press comprising a long upper die and a lower die, wherein the upper die has a plurality of notches in the longitudinal direction, and the notches Each is provided with a measurement sensor capable of measuring the displacement of the workpiece along the thickness direction of the mold.
The bending press according to a second aspect of the present invention is the bending press according to the first aspect, wherein the lower mold comprises a plurality of small lower molds arranged in the longitudinal direction, and an adjustment mechanism for adjusting the height of the small lower mold to each of the small lower molds. It is characterized by providing.
The bending press of the third invention is characterized in that, in the second invention, the measurement sensor is arranged at a position corresponding to the center of each of the small lower molds.
A bending press according to a fourth aspect of the present invention is a bending press comprising a long upper die and a lower die, wherein the lower die has a plurality of notches in the longitudinal direction, and the notches Each is provided with a measurement sensor capable of measuring the displacement of the workpiece along the thickness direction of the mold.
A bending press according to a fifth aspect of the present invention is the bending press according to the fourth aspect, wherein the upper mold is composed of a plurality of small upper molds arranged in the longitudinal direction, and an adjustment mechanism for adjusting the height of the small upper mold to each of the small upper molds It is characterized by providing.
The bending press according to a sixth invention is characterized in that, in the fifth invention, the measurement sensor is arranged at a position corresponding to the center of each of the small upper dies.
In a bending press according to a seventh aspect of the present invention, in the first, second, third, fourth, fifth or sixth aspect, the measurement sensor is a non-contact displacement meter, and the measurement sensor is disposed in the thickness direction of the mold. It is characterized by comprising a moving device that moves along the line.
A bending press according to an eighth aspect of the present invention is the bending press according to the seventh aspect, wherein the moving device includes a servo motor, a feed screw that is rotated by the servo motor, and a bracket that is fitted to the feed screw and slides by rotation of the feed screw. The measurement sensor is attached to the bracket.
The bending press according to a ninth invention is the bending press according to the second, third, fifth or sixth invention, wherein the adjusting mechanism is a servo motor, a feed screw rotated by the servo motor, and a feed screw fitted to the feed screw. It is characterized by comprising a lower wedge that slides by rotation of a screw, and an upper wedge that slides relative to the lower wedge and changes its height by sliding the lower wedge.
The bending press according to a tenth aspect of the present invention is the information processing apparatus connected to the measurement sensor according to the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth aspect, and the information A display screen connected to the processing device, and the bending cross-sectional shape of the workpiece measured by the measurement sensor is displayed on the display screen.
The bending press according to an eleventh aspect of the invention is characterized in that, in the tenth aspect of the invention, the bending cross-sectional shapes at the respective measurement positions in the longitudinal direction of the workpiece measured by the plurality of measurement sensors are superimposed and displayed.
The bending press according to a twelfth aspect of the invention is characterized in that, in the tenth aspect of the invention, the bending cross-sectional shape of the workpiece at the time of reduction and pressure release measured by the measurement sensor is displayed in an overlapping manner.

According to the first invention, since the measurement sensor capable of measuring the displacement of the workpiece along the thickness direction of the mold is provided in the notch portion of the upper die, the workpiece is not hidden by the upper die, and the bending position The bending angle can be measured in the vicinity. Therefore, in the case of sequential bending, even if the interval between the bending positions is narrow, the bending angle at the bending position to be measured can be accurately measured. In addition, since a plurality of measurement sensors are provided in the longitudinal direction of the upper mold, it is possible to measure the bending cross-sectional shape of a plurality of parts in the longitudinal direction of the workpiece, and to measure the influence of the bending of the press frame. .
According to the second invention, since each of the small lower molds is provided with an adjustment mechanism for adjusting the height, the height can be adjusted for each small lower mold and the workpiece spring back can be corrected. The influence of frame deflection can also be corrected.
According to the third aspect of the invention, since the measurement sensor and the small lower mold are arranged at corresponding positions, the correction amount at the measurement position is individually determined based on the bending cross-sectional shape measured by each measurement sensor. The height of the small lower mold corresponding to the measurement sensor can be individually adjusted. Therefore, the workpiece spring back can be corrected for each measurement position, and the influence of the press frame deflection can also be corrected.
According to the fourth invention, since the measurement sensor capable of measuring the displacement of the workpiece along the thickness direction of the die is provided in the notch portion of the lower die, the workpiece is not hidden by the lower die, and the bending position The bending angle can be measured in the vicinity. Therefore, in the case of sequential bending, even if the interval between the bending positions is narrow, the bending angle at the bending position to be measured can be accurately measured. In addition, since a plurality of measurement sensors are provided in the longitudinal direction of the lower mold, the bending cross-sectional shape of a plurality of parts in the longitudinal direction of the workpiece can be measured, and the influence of the bending of the press frame can be measured. .
According to the fifth invention, since each of the small upper dies is provided with an adjustment mechanism for adjusting the height, the height can be adjusted for each of the small upper dies, the spring back of the workpiece can be corrected, The influence of frame deflection can also be corrected.
According to the sixth aspect of the invention, since the measurement sensor and the small upper die are arranged at corresponding positions, the correction amount at the measurement position is individually determined based on the bending cross-sectional shape measured by each measurement sensor. The height of the small upper mold corresponding to the measurement sensor can be individually adjusted. Therefore, the workpiece spring back can be corrected for each measurement position, and the influence of the press frame deflection can also be corrected.
According to the seventh aspect of the invention, since the moving device that moves the measurement sensor, which is a non-contact displacement meter, along the thickness direction of the mold is provided, the bending cross-sectional shape of the workpiece is measured by driving the moving device. be able to.
According to the eighth invention, the moving device is composed of a servo motor, a feed screw and a bracket.
The measurement sensor can be moved in the thickness direction of the mold by driving the servo motor. Since the measurement sensor is a non-contact displacement meter, the bending cross-sectional shape of the workpiece can be measured by moving the measurement sensor in the thickness direction of the mold.
According to the ninth aspect of the invention, the adjustment mechanism includes the servo motor, the feed screw, the lower wedge, and the upper wedge, so that the height of the mold can be adjusted by driving the servo motor. Further, since the height is adjusted by sliding between the lower wedge and the upper wedge, it is easy to finely adjust the height, and the height hardly changes due to the reduction.
According to the tenth aspect, since the bending cross-sectional shape of the workpiece measured by the measurement sensor is displayed on the display screen, it is possible to grasp the influence of the springback amount and the deflection of the press frame at each measurement position.
According to the eleventh aspect, the bending cross-sectional shape of each part in the longitudinal direction of the workpiece measured by the measurement sensor is displayed in an overlapping manner, so that the influence of the press frame bending can be grasped.
According to the twelfth aspect of the invention, the bending cross-sectional shapes measured by the measurement sensor at the time of reduction and at the time of pressure release are superimposed and displayed, so that the amount of springback at the measurement position can be grasped.

It is a front view of the bending press which concerns on 1st Embodiment of this invention. It is a partial enlarged front view of a small upper mold and a small lower mold of the bending press. It is a movement apparatus of the bending press, Comprising: (A) figure is a bottom view, (B) figure is a BB arrow sectional drawing in (A) figure. FIG. 2A is a side sectional view of the bending press. FIG. 4A shows a workpiece placed on a lower mold, and FIG. It is side sectional drawing of the same bending press, Comprising: (C) A figure is at the time of pressure relief, (D) figure shows the time at the time of reduction in sequential bending. It is explanatory drawing of the display screen of the bending press. It is a front view of the bending press which concerns on 2nd Embodiment of this invention. It is a partial enlarged front view of a small upper mold and a small lower mold of the bending press. It is side view sectional drawing of the bending press. It is sectional drawing of the side view of the bending press of a prior art.

Next, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
As shown in FIG. 1, the bending press A according to the first embodiment of the present invention comprises a crown 11 as an upper frame, a bed 12 as a lower frame, and a columnar upright 13 between them. A press frame 10 is provided. The crown 11 and the bed 12 are long, and the bending press A can bend a workpiece W such as a long steel plate. A plurality of reduction devices 20 such as hydraulic cylinders are attached to the crown 11 in the longitudinal direction of the press frame 10, and the slide 14 is moved up and down by these operations. A long upper mold 30 (punch) is installed on the bottom surface of the slide 14, and a long lower mold 40 (V-shaped mold) is installed on the top surface of the bed 12. In this way, bending can be performed by applying force to the workpiece.

  The upper mold 30 is composed of five small upper molds 30 a to 30 e and is installed on the bottom surface of the slide 14 along the longitudinal direction of the press frame 10. Moreover, as shown in FIG. 2, each small upper mold | type 30a-30e has the notch part 31 in each center, and the measurement sensors 50a-50e and the moving apparatus 70 are provided in each notch part 31. As shown in FIG. ing. That is, five measurement sensors 50 a to 50 e are provided side by side in the longitudinal direction of the press frame 10.

On the slide 14 side of the notch 31, a space is provided so that the measurement sensors 50a to 50e and the moving device 70 can be installed. The gap on the lower die 40 side of the notch 31 is narrow, so that the area where the workpiece W and the upper die 30 come into contact with each other is widened.
Note that the measurement sensors 50a to 50e are non-contact displacement gauges such as a laser type, and the gap on the lower mold 40 side of the notch 31 is an interval that does not interfere with the optical path of the measurement laser or the like.

  The lower mold 40 is also composed of five small lower molds 40a to 40e. Adjustment mechanisms 60a to 60e for individually adjusting the heights of the small lower molds 40a to 40e are installed on the upper surface of the bed 12, and the small lower molds 40a to 40e are installed on the respective adjustment mechanisms 60a to 60e. . That is, the small upper molds 30a to 30e, the small lower molds 40a to 40e, the measurement sensors 50a to 50e, and the adjustment mechanisms 60a to 60e are provided at corresponding positions.

In this embodiment, the upper mold 30 includes five small upper molds 30a to 30e. However, the upper mold 30 is not limited to this, and may be an embodiment in which notched portions are provided at a plurality of locations as an integral upper mold.
Further, in the present embodiment, the above-described five reduction devices 20 are also mounted side by side, and the positions thereof correspond to the small lower molds 40a to 40e, but are not limited to this, and are not installed at corresponding positions. It is good also as an embodiment.

  The adjustment mechanisms 60a to 60e provided in the small and small dies 40a to 40e include a servo motor 61, a feed screw 62, a lower wedge 63, and an upper wedge 64. The servo motor 61 can be rotated forward and backward, and a feed screw 62 provided horizontally with respect to the bed 12 can be rotated forward and backward by driving the servo motor 61. The lower wedge 63 whose upper surface is inclined is fitted with a feed screw 62 by a ball screw mechanism or the like, and slides in the horizontal direction by the rotation of the feed screw 62. The upper wedge 64 is inclined at the bottom, and is in surface contact with the upper surface of the lower wedge. The upper wedge 64 can only be raised and lowered, and when the lower wedge 63 slides, the upper surface of the lower wedge 63 and the bottom surface of the upper wedge 64 slide so that the height of the upper wedge 64 can be adjusted. Yes.

  Since it is such a structure, the height of the small lower mold | types 40a-40e can be adjusted separately by the drive of the servomotor 61. FIG. Further, since the adjustment mechanisms 60a to 60e adjust the height with the wedge, it is easy to finely adjust the height, and the height hardly changes due to the reduction.

As shown in FIG. 3, the measurement sensor 50 is attached to a moving device 70 that can move along the thickness direction of the molds 30 and 40 (the direction perpendicular to the paper surface in FIG. 2 and the depth direction of the bending press). .
The moving device 70 includes a servo motor 71, a feed screw 72, a guide shaft 73, and a bracket 74. The servo motor 71 can be rotated forward / reversely, and the feed screw 72 can be rotated forward / reversely by driving the servo motor 71. Two guide shafts 73 are provided in parallel with the feed screw 72 interposed therebetween. The box-shaped bracket 74 is provided with three holes penetrating the side surface, and a feed screw 72 and a guide shaft 73 are inserted into the holes. The bracket 74 is fitted with a feed screw 72 and a ball screw mechanism or the like, and slides along the guide shaft 73 by the rotation of the feed screw 72. The measurement sensor 50 is attached to the bracket 74.

The moving device 70 is installed on the bottom surface of the slide 14 in the notch 31 of the upper mold 30 so that the feed screw 72 is in the thickness direction of the molds 30 and 40. Therefore, the measurement sensor 50 can be moved along the thickness direction of the molds 30 and 40 by driving the servo motor 71.
The bending cross-sectional shape of the workpiece W can be measured by measuring the displacement of the workpiece W while moving the measurement sensor 50 along the thickness direction of the molds 30 and 40.
Here, the “bending cross-sectional shape” means a cross-sectional shape in the thickness direction of the dies 30 and 40 of the workpiece W to be bent.

By the way, when the workpiece W is bent by a bending press, a springback occurs due to the elasticity of the workpiece W, and in reality, the bending may be performed only at an angle larger than a set angle. Further, in the case of a bending press having a long press frame, the middle portion of the crown is bent so as to open upward, the bending angle is different in each longitudinal part of the workpiece W, or warping occurs in the longitudinal direction. There is a case.
As will be described in detail below, the influence of the springback and press frame deflection is measured by the measurement sensor 50, and the height of the lower die 40 is adjusted by the adjustment mechanisms 60a to 60e, whereby the workpiece W is bent to a set angle. It can be corrected so that it can be processed.

As shown in FIG. 4, when the workpiece W is bent by the bending press A, the workpiece W is first installed on the lower die 40 in a state where the upper die 30 and the lower die 40 are separated (see FIG. 4A). ). Next, the slide 14 is lowered by the operation of the reduction device 20, and a force is applied to the workpiece W by the upper die 30 and the lower die 40 (see FIG. 4B). Since the upper mold 30 is a punch and the lower mold 40 is a V-shaped mold, the work W is bent by applying a force between the upper mold 30 and the lower mold 40. Since the bending angle of the workpiece W is determined by the approach distance between the upper die 30 and the lower die 40, the stroke amount of the slide 14 is controlled so that a predetermined bending angle is obtained. Next, as shown in FIG. 5C, the slide 14 is raised, and the upper mold 30 is separated from the workpiece W (pressure release), whereby the bending of the workpiece W is completed.
In the case of further sequential bending, as shown in FIG. 5D, the workpiece W is moved in the thickness direction of the molds 30 and 40, and the force is applied to the workpiece W again by the upper die 30 and the lower die 40. In addition, bending is performed.

Each of the measurement sensors 50a to 50e drives the moving device 70 and moves along the thickness direction of the dies 30 and 40 during the reduction in the bending process (see FIG. 4B), and moves the displacement of the workpiece W. taking measurement. Further, the measurement is again performed along the thickness direction of the molds 30 and 40 even when the pressure is released (see FIG. 5C).
At this time, since the measurement sensor 50 is provided in the notch 31 of the upper mold 30 and the laser of the measurement sensor 50 can be projected through the notch 31, the workpiece W is not hidden by the upper mold 30 and is bent. The bending angle can be measured in the vicinity of the position, and the bending cross-sectional shape of the workpiece W can be measured.

The measurement of the bending cross-sectional shape is performed at the time of reduction and pressure release even in the case of sequential bending processing (see FIG. 5D).
Even in the case of sequential bending, even if the interval between the bending positions is narrow, the measurement sensor 50 measures the bending angle in the vicinity of the bending position of the workpiece W. Therefore, the bending angle at the bending position to be measured can be accurately measured. .

  In addition, since a plurality of measurement sensors 50 a to 50 e are provided in the longitudinal direction of the upper mold 30, it is possible to measure the bending cross-sectional shape at each measurement position in the longitudinal direction of the workpiece W. The influence of the bending of the press frame 10 can be grasped from the bending cross-sectional shape of each measurement position.

  Each of the measurement sensors 50a to 50e is connected to an information processing apparatus (not shown), and a display screen D is connected to the information processing apparatus. The information processing apparatus forms a bent cross-sectional shape of the workpiece W from the measurement result of the measurement sensor 50 and performs a process of displaying the bent cross-sectional shape on the display screen D.

In order to display the bending cross-sectional shape on the display screen D, for example, the horizontal axis is displayed as the thickness direction distance of the molds 30 and 40, and the vertical axis is displayed as the stroke direction distance of the upper mold 30.
And if the bending cross-sectional shape of each measurement position of the workpiece | work W of the longitudinal direction of the workpiece | work W measured with each measurement sensor 50a-50e is superimposed and displayed, since the difference in a bending angle will be understood by a measurement position, the influence of the bending of the press frame 10 will be understood. Can be grasped.

Further, as shown in FIG. 6, the bending cross-sectional shape of the workpiece W measured by the same measurement sensor 50 at the time of reduction (FIG. 4B) and at the time of pressure release (FIG. 5C) is superimposed and displayed. For example, the springback amount at each measurement position can be grasped by comparing the bending angles.
Thus, if the bending cross-sectional shape of the workpiece W measured by the measurement sensor 50 is displayed on the display screen D, the respective bending cross-sectional shapes can be compared, and the influence of the springback amount and the press frame deflection at each measurement position can be grasped. Can do.

The information processing apparatus is further connected to servo motors 61 of adjusting mechanisms 60a to 60e so that each servo motor 61 can be controlled.
Then, the information processing apparatus calculates the influence of the springback amount and the deflection of the press frame from the bending cross-sectional shape at each measurement position, calculates a correction amount that can be bent to a set angle at each measurement position, and servo motor 61 To adjust the height of the small lower molds 40a to 40e.

More specifically, if the workpiece W can be bent only at an angle larger than the set angle by springback as a result of measuring the bending cross-sectional shape, the height of the small lower molds 40a to 40e corresponding to the measurement position is adjusted to be high. In addition, the bending angle should be determined in consideration of the amount of springback during the reduction.
Further, when the bending near the center of the press frame 10 is weak due to the influence of the bending of the press frame 10, the height of the small lower molds 40a to 40e corresponding to the measurement position is adjusted to be high, and the press frame 10 is pressed during the reduction. The bending angle should be set in consideration of the influence of bending.

  If the workpiece W is bent again after adjusting the heights of the small lower dies 40a to 40e in this way, the bending can be performed at a set angle. Moreover, if it is the same kind of workpiece | work W, a bending process can be performed to a setting angle by one time of pressing by performing a bending process in the state after adjustment.

Thus, since each of the small lower molds 40a to 40e includes the adjusting mechanisms 60a to 60e for adjusting the height, the height of each of the small lower molds 40a to 40e is adjusted so that the spring back of the workpiece W can be applied. Simultaneously with the correction, the influence of the deflection of the press frame can also be corrected.
Further, since the measurement sensors 50a to 50e and the small lower molds 40a to 40e are respectively arranged at corresponding positions, the correction amount at the measurement position is individually determined based on the bending cross-sectional shape measured by each measurement sensor. The heights of the small lower molds 40a to 40e corresponding to the measurement sensors 50a to 50e can be individually adjusted. Therefore, the spring back of the workpiece W can be corrected for each measurement position, and the influence of the press frame deflection can also be corrected.

(Second Embodiment)
As shown in FIG. 7, the bending press B according to the second embodiment of the present invention is the same as the bending press A according to the first embodiment, but the measuring sensor 50 is located on the lower mold 40 (40a to 40e) side. Is provided on the upper die 50 (50a to 50e) side. Since the rest of the configuration is the same as that of the bending press A, the same reference numerals are assigned to the same members, and descriptions thereof are omitted.

The upper mold 30 includes five small upper molds 30a to 30e, and adjustment mechanisms 60a to 60e for individually adjusting the heights of the small upper molds 30a to 30e are installed on the bottom surface of the slide 14, and the respective adjustment mechanisms 60a to 60e. The small upper molds 30a to 30e are installed below.
The lower mold 40 is also composed of five small lower molds 40 a to 40 e and is installed on the upper surface of the bed 12 along the longitudinal direction of the press frame 10. Moreover, as shown in FIG. 8, each small lower mold | type 40a-40e has the notch part 41 in each center, and the measurement sensors 50a-50e and the moving apparatus 70 are provided in each notch part 41. As shown in FIG. ing.
In the present embodiment, the lower mold 40 includes five small lower molds 40a to 40e. However, the present invention is not limited to this, and an embodiment in which notches are provided at a plurality of locations may be used as an integrated lower mold.

As shown in FIG. 9, in the bending press B, the measurement sensor 50 measures from the lower die 40 side, but the measurement sensor 50 is provided in the notch 41 of the lower die 40, and the laser of the measurement sensor 50, etc. Can project through the notch 41, so that the workpiece W is not hidden by the lower mold 40, the bending angle can be measured in the vicinity of the bending position, and the bending sectional shape of the workpiece W can be measured.
Since a plurality of measurement sensors 50 a to 50 e are provided in the longitudinal direction of the lower mold 40, the bending cross-sectional shape at each measurement position in the longitudinal direction of the workpiece W can be measured. The influence of the bending of the press frame 10 can be grasped from the bending cross-sectional shape of each measurement position.

The bending press B calculates a correction amount that can be bent to a set angle from the bending cross-sectional shape at each measurement position, drives the servo motor 61, and adjusts the height of the small upper dies 30a to 30e, The influence of the springback or the bending of the press frame 10 can be corrected.
In addition, the bending press B has the same effect as the bending press A.

(Other embodiments)
In the above-described embodiment, the bending cross-sectional shape can be measured by moving the measurement sensor 50 along the thickness direction of the dies 30 and 40 by the moving device 70. Instead, the measurement sensor 50 is displaced linearly. An embodiment using a measurement sensor capable of measurement may be used. For example, it is possible to use a measurement sensor that projects linear laser light, captures the reflected light with a CCD camera, and measures the bent cross-sectional shape by processing the captured image.

  In addition, the measurement sensor 50 does not need to measure the bending cross-sectional shape over a wide range in the thickness direction of the molds 30 and 40, and it is only necessary to measure the vicinity of the bending position to be measured. And if a bending angle can be measured, it is not necessary to measure a bending cross-sectional shape, and the measuring method according to the characteristic of the measurement sensor to employ | adopt can be selected.

In the above-described embodiment, the upper die 30 and the lower die 40 are divided into five, and the measurement sensor 50 and the adjustment mechanism 60 are provided corresponding to each of them. However, the number of divisions is not limited to this, and the press frame 10 It can be divided into an arbitrary number according to the size.
Further, the present invention can be applied to an underdrive type bending press in addition to the overdrive type bending press as in the above-described embodiment.

DESCRIPTION OF SYMBOLS 10 Press frame 20 Reduction device 30 Upper mold | type 40 Lower mold | type 50 Measurement sensor 60 Adjustment mechanism 70 Moving apparatus W Workpiece | work

Claims (12)

A bending press comprising a mold composed of a long upper mold and a lower mold,
The upper mold has a plurality of notches in the longitudinal direction;
A bending press characterized in that a measurement sensor capable of measuring a displacement of a work along the thickness direction of the mold is provided in each of the notches. The lower mold comprises a plurality of small lower molds arranged in the longitudinal direction,
2. The bending press according to claim 1, further comprising an adjusting mechanism for adjusting the height of each of the small lower molds. The bending press according to claim 2, wherein the measurement sensor is disposed at a position corresponding to the center of each of the small lower molds. A bending press comprising a mold composed of a long upper mold and a lower mold,
The lower mold has a plurality of notches in the longitudinal direction;
A bending press characterized in that a measurement sensor capable of measuring a displacement of a work along the thickness direction of the mold is provided in each of the notches. The upper mold comprises a plurality of small upper molds arranged in the longitudinal direction,
The bending press according to claim 4, further comprising an adjustment mechanism for adjusting the height of the small upper mold in each of the small upper molds. 6. The bending press according to claim 5, wherein the measurement sensor is arranged at a position corresponding to the center of each of the small upper dies. The measurement sensor is a non-contact displacement meter,
The bending press according to claim 1, 2, 3, 4, 5 or 6, further comprising a moving device for moving the measurement sensor along a thickness direction of the mold. The moving device includes a servo motor, a feed screw that is rotated by the servo motor, and a bracket that is fitted to the feed screw and slides by rotation of the feed screw.
The bending press according to claim 7, wherein the measurement sensor is attached to the bracket. The adjusting mechanism includes a servo motor, a feed screw that is rotated by the servo motor, a lower wedge that is fitted to the feed screw and that is slid by rotation of the feed screw, and that slides relative to the lower wedge, and the lower wedge 7. The bending press according to claim 2, comprising an upper wedge whose height is changed by sliding. An information processing device connected to the measurement sensor, and a display screen connected to the information processing device,
The bending press according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein a bending sectional shape of the workpiece measured by the measurement sensor is displayed on the display screen. The bending press according to claim 10, wherein the bending cross-sectional shapes of the respective measurement positions in the longitudinal direction of the workpiece measured by the plurality of measurement sensors are displayed in an overlapping manner. The bending press according to claim 10, wherein the bending cross-sectional shapes of the workpiece at the time of reduction and pressure release measured by the measurement sensor are displayed in an overlapping manner.

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