JP2005014056A - Bending machine and its bending method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bending machine capable of detecting a precise bending force or a stroke (tip end position of a punch) for the purpose of obtaining an angle with high accuracy, and to provide its bending method. <P>SOLUTION: The machine is characterized in that, between a lower die D for bending a planar work and a table 13 for supporting this lower die, there are arranged in contact with each other a plurality of die supporting members 25 which have a die holder 19 in the center in the longitudinal direction of the lower die D, and that a load detecting means 23 is installed for detecting a load which acts on each die supporting member 25 at the time of bending. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bending apparatus and a bending method for bending a workpiece.
[0002]
[Prior art]
In a bending apparatus for bending a workpiece, it is important to accurately detect a bending force when calculating a ram stroke for obtaining a predetermined bending angle. Based on this bending force, the mechanical deflection (side plate deflection, upper and lower table deflection, etc.) must be calculated.
[0003]
Conventionally, for example, in a hydraulic drive type press brake, a pressure sensor is provided in a hydraulic cylinder to detect a bending force. In the ball screw drive type press brake, the bending force is detected by the motor torque.
[0004]
In a bending apparatus for bending a workpiece, it is already known that a wedge provided on a punch holder is automatically moved by a predetermined amount to automatically obtain a crowning curve (working curve) that is a downward projecting curve of the punch ( Patent Document 3).
[0005]
In addition, a number of ceramic actuators in which a plurality of piezoelectric elements are laminated between the lower table and the lower die (die) in the bending apparatus are provided in the longitudinal direction, and a voltage is applied to each to apply a crowning curve (processing) It is also known that (curve) is adjusted (Patent Document 4).
[0006]
[Patent Document 1]
JP-A-5-329553
[0007]
[Patent Document 2]
Japanese Patent Publication No. 3-54013
[0008]
[Patent Document 3]
JP 58-320 A
[0009]
[Patent Document 4]
Japanese Patent Publication No. 6-18665
[0010]
[Problems to be solved by the invention]
By the way, in the detection of the bending force by the conventional pressure sensor described above, there has been a problem that an accurate pressure cannot be detected due to the sliding resistance of the piston of the hydraulic cylinder. Further, in the detection of the bending force by the motor torque, it has been impossible to detect a delicate bending force.
[0011]
If a predetermined amount of a curved line projecting downward on the punch side is obtained as in the above-described conventional patent document 3, it is disadvantageous in that the flange length can be obtained accurately. Because the flange dimension is determined by the distance between the punch tip and the back gauge abutment, operating the punch side adversely affects the distance between the punch tip and the back gauge abutment. Will be affected.
[0012]
Moreover, in the above-mentioned conventional patent document 4, the ceramic actuator cannot take a large amount of current stroke. In normal processing, a crowning curve of about 0.1 mm to 1 mm is required, and even if 150 mm of piezoelectric elements are stacked, a stroke amount of about 3/100 = 0.03 mm can be obtained, and a predetermined processing line cannot be realized.
[0013]
The present invention has been made to solve the above-mentioned problems, and its purpose is to detect an accurate bending force or stroke (punch tip position) in order to obtain an accurate angle, and to affect the flange dimension of the workpiece. It is an object of the present invention to provide a bending apparatus and a bending method thereof in which a desired processing line (crowning curve) can be automatically set without giving the above.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the bending apparatus of the present invention according to claim 1 is characterized in that the lower mold is disposed between a lower mold for bending a plate-shaped workpiece and a table supporting the lower mold. A load for detecting a load acting on each mold support member at the time of bending by providing a plurality of mold support members having a mold support portion at the center in the longitudinal direction in contact with each other. A detection means is provided.
[0015]
Accordingly, a plurality of mold support members are arranged in contact with each other in the longitudinal direction of the lower mold between a lower mold for bending the plate-shaped workpiece and a table supporting the lower mold. Is provided. Since load detecting means for detecting the load acting on each mold support member at the time of bending is provided, the load acting on each mold support member at the time of bending is detected by this load detecting means. Is done.
[0016]
Based on the detected load, an accurate applied pressure is detected, and the noise is detected in a form that is completely removed. Further, the stroke (punch tip position) is accurately detected.
[0017]
The bending apparatus according to a second aspect of the present invention is the bending apparatus according to the first aspect, wherein the load detecting means is a strain gauge or a load cell, and is provided at the center of the lower surface of each mold support member. It is what.
[0018]
Therefore, the load detecting means is a strain gauge or a load cell, and is provided at the center of the lower surface of each mold support member, so that each load can be detected more accurately.
[0019]
A bending apparatus according to a third aspect of the present invention is the bending apparatus according to the first or second aspect, wherein each mold supporting portion of each mold supporting member is provided so as to be vertically adjustable. is there.
[0020]
Therefore, since each mold support portion of each mold support member is provided so as to be vertically adjustable, each stroke (punch tip position) can be easily adjusted.
[0021]
According to a fourth aspect of the present invention, there is provided a bending apparatus which reciprocally moves one of a lower table having a die mold and a lower table having a punch mold so that the punch mold and the die mold cooperate. A bending apparatus for bending a workpiece by movement, wherein a bending force detecting means is provided between the lower table and the die mold, and the bending force detecting means projects a mold supporting portion at the center of the upper surface. And a mold supporting member having both ends supported by a supporting portion provided in the lower table and having a load detecting means at the center of the lower surface.
[0022]
Therefore, a bending force detecting means is provided between the lower table and the die mold, and the bending force detecting means has a mold supporting portion protruding at the center of the upper surface, and a support provided in the lower table. Since it consists of a die support member that is supported at both ends by a part and has a load detecting means at the center of the lower surface, the pressure applied to the workpiece by, for example, a punch die to process the workpiece is It is transmitted to the central part of the mold supporting member supported at both ends through the mold.
[0023]
At this time, the mold support member is bent due to the applied pressure, and at the same time, the strain amount of the mold support member is detected by the load detection means provided on the lower surface of the mold support member. In addition, since the relationship between the amount of distortion of the mold support member and the applied pressure, which is the bending force, is preliminarily stored in a database, accurate applied pressure can be detected even with a minute applied pressure, and no noise components can be detected. It is detected in the removed form. Further, the stroke (punch tip position) is accurately detected.
[0024]
A bending apparatus according to a fifth aspect of the present invention is the bending apparatus according to the fourth aspect, wherein a plurality of the bending force detecting means are provided adjacent to each other in the longitudinal direction of the lower table. is there.
[0025]
Therefore, since a plurality of the bending force detecting means are provided adjacent to each other in the longitudinal direction of the lower table, each load detecting means provided on the lower surface of each elastic member by each bending force detecting means is used for the mold support member. The amount of distortion is detected. The total sum of the detected amounts of distortion is obtained. In addition, since the relationship between the amount of distortion of the mold support member and the applied pressure, which is the bending force, is preliminarily created in a database, a more accurate applied pressure can be detected even with a small applied pressure, and components that cause noise can be detected. It is detected in a completely removed form. Further, the stroke (punch tip position) is detected more accurately.
[0026]
The bending apparatus according to a sixth aspect of the present invention is the bending apparatus according to the fifth aspect, wherein the distance between the support points of the mold support members in the bending force detecting means is from the center of the lower table to the end. It is characterized by becoming longer in order.
[0027]
Therefore, since the distance between the support points of each mold support member in each of the bending force detection means becomes longer in order from the center of the lower table toward the end, the distance between the blades of the punch mold and the die mold The distance is uniform over the longitudinal direction of the lower table, and a precise bending angle is obtained.
[0028]
According to a seventh aspect of the present invention, there is provided a bending apparatus that reciprocally moves one of a lower table having a die mold and a lower table having a punch mold so that the punch mold and the die mold cooperate with each other. A bending apparatus for bending a workpiece by movement, wherein a plurality of height adjusting segments for adjusting the height in the longitudinal direction of the die mold are appropriately spaced between the lower table and the die mold. A load detecting means for detecting a load acting on each of the height adjusting segments during the bending process is provided.
[0029]
Accordingly, height adjustment segments for adjusting a plurality of heights in the longitudinal direction of the die lower die are provided at appropriate intervals between the lower table and the die die, and at the time of bending processing. Since load detecting means for detecting the load acting on each height adjusting segment is provided, the distance between the blades in the longitudinal direction between the punch die and the die die is determined by each height adjusting segment. The load is detected by each load detecting means while being adjusted. Thus, the bending angle is uniform over the longitudinal direction of the lower table, and a precise bending angle is obtained.
[0030]
A bending apparatus according to an eighth aspect of the present invention is the bending apparatus according to the seventh aspect, wherein each of the height adjusting segments moves up and down the inverted U-shaped member and the inverted U-shaped member. A screw mechanism and a lever for rotating the screw mechanism are provided.
[0031]
Therefore, each height adjusting segment includes an inverted U-shaped member, a screw mechanism for moving the inverted U-shaped member up and down, and a lever for rotating the screw mechanism. The height of each inverted U-shaped member is adjusted by rotating the screw mechanism of the inverted U-shaped member by turning in one direction.
[0032]
A bending apparatus according to a ninth aspect of the present invention is the bending apparatus according to the seventh or eighth aspect, wherein the load detecting means is provided in an inverted U-shaped member.
[0033]
Therefore, since the load detecting means is provided in the inverted U-shaped member, each load received by the inverted U-shaped member is accurately detected by each load detecting means.
[0034]
A bending apparatus according to a tenth aspect of the present invention is the bending apparatus according to the seventh, eighth or ninth aspect, wherein the load detecting means is a strain gauge or a load cell.
[0035]
Therefore, since the load detecting means is a strain gauge or a load cell, each load received by the inverted U-shaped member is more accurately detected.
[0036]
A bending apparatus according to an eleventh aspect of the present invention is the bending apparatus according to the seventh, eighth, ninth or tenth aspect, wherein the height adjustment amount of each of the height adjusting segments is displayed on the operation screen. It is a feature.
[0037]
Therefore, since the height adjustment amount of each height adjustment segment is displayed on the operation screen, the height adjustment amount of each height adjustment segment is more easily adjusted.
[0038]
According to a twelfth aspect of the present invention, there is provided a bending apparatus which reciprocally moves one of a lower table having a die mold and a lower table having a punch mold so as to cooperate between the punch mold and the die mold. A bending apparatus for bending a workpiece by movement, wherein a plurality of height adjustments are provided between the lower table and the die mold and arranged at appropriate intervals in the longitudinal direction of the die lower die. A segment for height adjustment, an input means for inputting product information, a bending order and a mold determining stage for determining a bending order and a mold, a lower table processing curve calculating means for calculating a processing curve of the lower table, Based on the calculation data calculated from the lower table machining curve calculation means, the height adjustment segment is provided with height adjustment operating means capable of individually adjusting each height adjustment segment.
[0039]
Accordingly, height adjustment segments for adjusting a plurality of heights in the longitudinal direction of the die lower die are provided between the lower table and the die die at appropriate intervals. The height of the adjusting segment is adjusted by the height adjusting operation means, and the distance (stroke value) between the blades in the longitudinal direction between the punch die and the die die is adjusted. Thus, the bending angle is uniform over the longitudinal direction of the lower table, and a precise bending angle is obtained.
[0040]
A bending apparatus according to a thirteenth aspect of the present invention is the bending apparatus according to the twelfth aspect, wherein each of the height adjusting segments is an inverted U-shaped member and an up-down movement of the inverted U-shaped member. A screw mechanism and a lever for rotating the screw mechanism, wherein the height adjusting operation means is composed of lever operating means for individually operating the levers. It is.
[0041]
Therefore, each of the height adjusting segments comprises an inverted U-shaped member, a screw mechanism for moving the inverted U-shaped member up and down, and a lever for rotating the screw mechanism. The height adjusting actuating means is composed of lever operating means for individually operating the levers. By rotating the lever in one direction by the lever operating means, the screw mechanism is rotated and the inverted U-shape is rotated. The height of the shape member is adjusted.
[0042]
A bending apparatus according to a fourteenth aspect of the present invention is the bending apparatus according to the thirteenth aspect, characterized in that the lever operating means can be moved and positioned to a position corresponding to each lever.
[0043]
Therefore, the lever operating means is moved and positioned to a position corresponding to each lever, and the inverted U-shaped member height of each height adjusting segment is easily adjusted.
[0044]
The bending apparatus according to a fifteenth aspect of the present invention is the bending apparatus according to the twelfth, thirteen or fourteenth aspect, wherein the calculation data calculated from the lower table processing curve calculating means is displayed on the operation screen. It is what.
[0045]
Accordingly, since the height adjustment amount of each height adjustment segment is displayed on the operation screen, the adjustment amount of the height adjustment segment can be adjusted more easily.
[0046]
According to a sixteenth aspect of the present invention, there is provided a bending method in which either one of a lower table having a die mold and a lower table having a punch mold is reciprocated to cooperate the punch mold and the die mold. In a bending method in which a workpiece is bent by movement, the tip of the punch die is placed in contact with and pressed against a reference block having a known height dimension placed on the die die, or the length of the lower table. The bending force detection means provided adjacent to each other in the direction detects the pressing force, detects the tip position of the punch die from the die stroke at that time, and uses the detected tip position of the punch die as a reference. The workpiece is bent as a position.
[0047]
Therefore, the tip of the punch die is pressed against a reference block or workpiece having a known height dimension placed on the die die. The applied pressure is detected by a bending force detecting means provided adjacently between the lower table and the die mold in the longitudinal direction of the lower table. The tip position of the punch die is detected from the die stroke at that time, and the workpiece is bent using the detected tip position of the punch die as a reference position. Thus, an accurate stroke is performed during bending.
[0048]
The bending method according to a seventeenth aspect of the present invention is the bending method according to the sixteenth aspect, wherein the bending force detecting means has a mold support portion protruding from the center of the upper surface, and is provided in the lower table. It consists of a mold support member supported at both ends by the support part and provided with a load detection means at the center part of the lower surface, and the distance between the support points of each mold support member is sequentially from the center of the lower table toward the end part. It is characterized by being long.
[0049]
Therefore, the bending force detecting means has a mold supporting portion protruding at the center of the upper surface, supported at both ends by the supporting portion provided in the lower table, and a load detecting means at the center of the lower surface. It consists of a die support member, and the distance between the support points of each die support member becomes longer in order from the center of the lower table to the end, so the distance between the punch die and the die die is lower. It becomes uniform over the longitudinal direction of the table, and a precise bending angle can be obtained.
[0050]
The bending method of the present invention according to claim 18 is the cooperation between the punch die and the die die by reciprocating either the lower table provided with the die die or the lower table provided with the punch die. In a bending method for bending a workpiece by movement, a bending order and a mold are determined based on product information, and a height adjustment amount of each height adjustment segment in the longitudinal direction of the workpiece is calculated in advance and an operation screen is displayed. The distance between the punch die and the die die and the bending width of the workpiece are calculated and the test bending is performed by adjusting the height of each height adjustment segment. Measure the bending force, the distance between the blades between the punch mold and the die mold, and the bending angle, calculate the material constant based on each measured value, and calculate this true material constant Based on the gap between the punch die and die die This is characterized by calculating and displaying the distance, the bending width of the workpiece and the height adjustment amount of each height adjustment segment, and performing the final bending process by re-adjusting the height of each height adjustment segment. is there.
[0051]
Therefore, the bending order and the mold are determined based on the product information. The height adjustment amount of each height adjustment segment in the longitudinal direction of the workpiece is calculated in advance and displayed on the operation screen. The distance between the blades between the punch die and the die die and the bending width of the workpiece are calculated. Subsequently, the height of each height adjusting segment is adjusted, and trial bending is performed. The actual bending force, the distance between the blades and the bending angle between the punch die and the die die are measured. A material constant is calculated based on each measured value, and based on the calculated true material constant, the distance between the blade between the punch die and the die die, the bending width of the workpiece, and each The height adjustment amount of the height adjustment segment is calculated and displayed, the height of each height adjustment segment is readjusted, and the main bending process is performed.
[0052]
Thus, the distance between the punch die and the die die is uniform over the longitudinal direction of the lower table, and a precise bending angle can be obtained.
[0053]
According to a nineteenth aspect of the present invention, there is provided a bending method in which either one of a lower table having a die die and a lower table having a punch die is reciprocated to cooperate the punch die and the die die. In a bending method that bends a workpiece by motion, the bending order and mold are determined based on product information, the height of each height adjustment segment in the longitudinal direction of the workpiece is adjusted, and then test bending And calculating a ram stroke value by calculating a bending force, a bending angle, and a true material constant of the workpiece at this time, and how much each of the height adjusting segments is adjusted is calculated as a lower table machining curve calculating means. Based on the calculated calculation data, the height adjustment amount of each height adjustment segment is displayed on the operation screen, and the height of each height adjustment segment is readjusted. , It is characterized in carrying out the present bending.
[0054]
Therefore, the bending order and the mold are determined based on the product information. The height adjustment amount of each height adjustment segment in the longitudinal direction of the workpiece is performed. The first bending process (trial bending) is performed to calculate the bending force, the bending angle, and the true material constant of the workpiece, thereby calculating the ram stroke value. Table curve data is calculated and displayed based on the calculated ram stroke value. Then, based on the displayed table curve data, the height adjustment amount of each height adjustment segment is readjusted, and the main bending process is performed.
[0055]
Thus, the distance between the punch die and the die die is uniform over the longitudinal direction of the lower table, and a precise bending angle can be obtained.
[0056]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Referring to FIGS. 4 and 5, for example, a press brake 1 as a bending apparatus includes side frames 3L and 3R which are erected, and reciprocates in the vertical direction above the side frames 3L and 3R. An upper table 5 is provided as a possible ram. A punch die P as an upper die is integrated with the lower portion of the upper table 5.
[0057]
In addition, hydraulic cylinders 7L and 7R are provided in front portions of the upper ends of the side frames 3L and 3R. The tip (lower end) of the piston rod 9 attached to the hydraulic cylinders 7L and 7R is integrated with the upper surface of the upper table 5.
[0058]
For example, a linear scale 11 is attached to a side surface of the side frame 3R as position detecting means for detecting a position when the upper table 5 reciprocates in the vertical direction.
[0059]
With the above configuration, when the hydraulic cylinders 7L and 7R are operated and the upper table 5 is reciprocated in the vertical direction via the piston rod 9, the upper table 5 is reciprocated when the upper table 5 is reciprocated in the vertical direction. Is detected by the linear scale 11.
[0060]
A lower table 13 is fixedly provided at a front portion of the lower side of the side frames 3L and 3R. A die holder 15 is provided on the upper portion of the lower table 13, and a die die D as a lower die is mounted on the upper portion of the die holder 15 so as to face the punch die P.
[0061]
Referring also to FIGS. 1, 2 and 3, a bending force detecting means 17 is provided between the lower table 13 and the die holder 15 to which the die mold D is mounted, in the longitudinal direction of the lower table 13 (FIG. 1). And a plurality of adjacent ones in the left-right direction in FIG. Each of the bending force detection means 17 has a mold support portion 19 at the center of the upper surface of the mold support member 25, and support portions 21 protruding from the lower table 13 on the opposing surfaces of the lower table 13 at both ends of the lower surface. And a mold support member 25 having a strain gauge 23 or a load cell as a load detection means (load detection means) and capable of elastic deformation such as a leaf spring.
[0062]
Also, a control device 27 for controlling the press brake 1 is installed, for example, on the left side in FIG.
[0063]
With the above configuration, the workpiece to be processed is placed on the die mold D, the hydraulic cylinders 7L and 7R are operated, and the upper table 5 is lowered through the piston rod 9, whereby the punch mold P and the die By the cooperation with the mold D, the workpiece is bent at a desired bending angle.
[0064]
As shown in FIG. 6, the control device 27 includes a CPU 29. An input device 31 such as a keyboard is connected to the CPU 29 and is a display device such as a CRT. A display device 33 is connected. The CPU 29 is connected to the linear scale 11 and to each strain gauge 23 of the bending force detecting means 17. Connected to the CPU 29 is a database 35 for determining the applied pressure based on the amount of strain detected by each strain gauge 23 according to the relational expression between the amount of strain and the applied pressure as shown in FIG. An arithmetic device 37 is connected to the CPU 29 for taking in each of the applied pressures obtained from the database 35 and calculating the total total applied pressure. Further, a reference block W having a known height dimension _B 1 and 2, the position when the punch die P is lowered in the state of being placed on the die die D is detected by the linear scale 11, and the detection signal is The reference block W when it is captured and exceeds a preset threshold value _B A punch tip position detecting device 39 for determining that the pressure is applied to the upper surface of the punch is connected to the CPU 29.
[0065]
With the above configuration, the workpiece to be machined is placed on the die mold D, the hydraulic cylinders 7L and 7R are operated, and the upper table 5 is lowered via the piston rod 9, whereby the workpiece is punched by the punch mold P. The applied pressure is concentrated and transmitted through the die mold D to the center portion of the mold support member 25 supported at both ends. The mold support member 25 is deflected by the applied pressure, and at the same time, the strain amount is detected as the deformation amount of the mold support member 25 by the strain gauges 23 attached to the center of the lower surface of the mold support member 2.
[0066]
Then, each distortion amount is taken into the database 35, and the applied pressures F1, F2, F3,. Each of the applied pressures F1, F2, F3,..., Fn is taken into the computing device 37, whereby the computing device 37 computes F1 + F2 + F3 +. Will be. As a result, even a minute force can be accurately detected, and the noise component can be detected in a completely removed form.
[0067]
Further, as shown in FIGS. 1 and 2, a reference block W having a known height dimension is used. _B Is placed on the die mold D, the position when the punch mold P is lowered is detected by the linear scale 11, and when the detection signal is taken into the punch tip position detector 39, the punch tip position is detected. When the detection signal value exceeds the threshold value as compared with the threshold value stored in the position detection device 39, the tip of the punch die P becomes the reference block W. _B It can be determined that the contact surface is pressed against the upper surface. Therefore, the position of the tip of the punch die P with respect to the upper surface of the die die D can be accurately detected. Reference block W with known height dimension _B If the plate thickness of the workpiece W to be processed is known, the workpiece W can be used.
[0068]
In addition, the length of each mold support member 25 in the left-right direction is previously tested, and is pressed with the maximum pressure of each machine, and the distance between the upper and lower table blades is set to be uniform in the longitudinal direction. That is, the distance between the upper and lower table blades is usually larger at the center and smaller as it goes to the end. Therefore, the bending angle of the work tends to increase at the center.
[0069]
Therefore, in the example of the present embodiment, the length in the left-right direction of the mold support member 25 constituting the bending force detection means 17 is set to the bending force detection means located at the end as shown in FIG. 8, for example. The distance between the table blades is made uniform by setting 17 to be longer, making it easy to bend, and conversely shortening the center part to make it difficult to bend.
[0070]
That is, in FIG. 8, from the center to the end, L1 <L2 <L3 <L4, and the end has a longer distance L4 between the support points to make it easier to bend, and conversely, the distance L1 between the support points has become shorter. Make it harder. As a result, the distance between the blades becomes uniform in the longitudinal direction, and a precise bending angle can be obtained.
[0071]
As described above, it is possible to calculate the accurate deflection of the mechanical system based on the detected bending force or pressure without noise, and the true material being processed based on the accurate bending force or pressure. Since the constant Young's modulus, F value, and the like can be accurately obtained, an accurate stroke with respect to a predetermined angle can be calculated.
[0072]
FIG. 9 shows another embodiment instead of FIG. 9, parts that are the same as the parts in FIG. 4 are given the same reference numerals, and redundant descriptions are omitted.
[0073]
In FIG. 9, a plurality of height adjusting segments 41 are provided at appropriate intervals in the longitudinal direction of the die mold between the lower table 13 and the die holder 15. In addition, a tension spring 43 for pulling the entire die holder 15 downward with an appropriate force at an appropriate interval is provided between the height adjusting segments 41. Therefore, each height adjusting segment 41 is always pressed downward.
[0074]
More specifically, as shown in FIGS. 10, 11 and 12, each height adjusting segment 41 has a double screw mechanism. The inverted U-shaped member 45 provided in the middle most receives a load from the upper surface. A male screw 47 is formed on the outer periphery of the inverted U-shaped member 45. An intermediate screw 49 is provided outside the inverted U-shaped member 45, and a female screw 51 is formed on the inner periphery of the intermediate screw 49. The male screw 47 and the female screw 51 are screwed at a pitch p.
[0075]
A male screw 53 is formed on the outer periphery of the intermediate screw 49. An outer nut member 55 is provided outside the intermediate screw 49, and a female screw 57 is formed on the inner periphery of the outer nut member 55. The male screw 53 and the female screw 57 are screwed at a pitch P. For example, a strain gauge 59 as a load detecting means is attached to the inner peripheral surface of the inverted U-shaped member 45. A lever 61 is attached to the outer peripheral upper portion of the middle screw 49.
[0076]
With the above configuration, when a load is applied as shown by an arrow in FIG. 12 from above the inverted U-shaped member 45 via the die holder 15, the strain gauge 59 attached to the inner peripheral surface of the inverted U-shaped member 45 The load at that time can be detected. Therefore, it is possible to measure the strain during the bending process in each height adjusting segment 41 and to detect the actual bending force with high accuracy.
[0077]
Further, when the lever 61 is turned in one direction, the inverted U-shaped member 45 is raised at a pitch p with respect to the intermediate screw 49 by the screw portions of the male screw 47 and the female screw 51. However, since the middle screw 49 descends at a pitch P with respect to the outer nut member 55 by the threaded portion of the male screw 53 and the female screw 57, the die holder 15 is moved upward to push the die holder 15 up. The distance between the blades of the mold P and the die mold D is set. When the lever 61 is turned in the other direction, the distance between the punch die P and the die die D is increased.
[0078]
Therefore, by adjusting the position of each inverted U-shaped member 45 in the vertical direction so as to improve the accuracy in the longitudinal direction of the workpiece, the distance between the punch die P and the die die D in the longitudinal direction can be adjusted. Therefore, the accuracy can be improved in the longitudinal direction of the workpiece.
[0079]
In order to correct the amount of bending in order to minimize the rotational torque of the intermediate screw 49 (light operating force), the machine portion is not a method of raising the central portion of the machine body (overcoming the pulling spring 43), but a machine. You may make it adjust in the direction which lowers the both ends of a main body.
[0080]
For example, as shown in FIG. 13, for example, the lever 61 of the height adjusting segment 41 in the middle of the three height adjusting segments 41 is lengthened, and each lever 61 is connected by a link member 63. Let Then, by operating the lever 61 of the middle height adjustment segment 41, the height adjustment of the three height adjustment segments 41 can be performed simultaneously. If a plurality of load detection / height adjustment segments 41 other than three are operated in the same manner, height adjustment can be performed simultaneously. Moreover, although the example which used the strain gauge 59 was shown as a load detection means, even if it attaches a piezoelectric element to the upper part of the inverted U-shaped member 45, it is also possible to detect a load (load).
[0081]
FIG. 14 shows another embodiment of the control device 27 in place of FIG. 14, parts that are the same as the parts in FIG. 6 are given the same reference numerals, and redundant descriptions are omitted.
[0082]
In FIG. 14, a height adjustment segment 41, a strain gauge or a load cell 59 is connected to the CPU 29. The CPU 29 is connected with a bending order / die determining means 65, a D value / L value calculating means 67, an actual bending force calculating means 69, an actual inter-blade amount calculating means 71 and a material constant calculating means 73. Yes.
[0083]
With the above configuration, the actual bending method will be described with reference to the flowchart shown in FIG. 15. First, product information (CAD information) is input from the host NC device via the input device 31 in step S1. In step S2, the operator determines the bending order / mold (mold layout) by the bending order / mold determining means 65. Further, in step S3, the D value and L value calculating means 67 calculates the D value (distance between the punch die P and the die die D) and the L value (distance between the bending line and the back gage). At this time, as shown in FIG. 16, the adjustment amount (x1, x2,..., Xn) of the lever 61 of the height adjustment segment 41 in order to obtain the angular accuracy according to the workpiece on the operation screen of the display device 33. The “adjustment amount for making the distance between the longitudinal blades during the bending process uniform” is calculated and displayed. In step S <b> 4, the operator turns the lever 61 of each height adjustment segment 41 in a predetermined direction in a predetermined memory based on the adjustment amount displayed on the operation screen of the display device 33.
[0084]
When the adjustment of each height adjustment segment 41 is completed in step S5, the workpiece is actually positioned on the die D and the upper table 5 is lowered by a predetermined stroke (D value) by depressing a foot pedal (not shown). Test bending is performed. Based on the detected strain amount (δ1 + δ2... + Δn) of each height adjusting segment 41 at this time, the actual bending force calculating means 69 calculates the actual bending force. At the same time, the actual inter-blade amount (at the time of the final stroke) is calculated by the actual inter-blade amount calculating means 71 using the following equation (1).
[0085]
Actual inter-blade distance = Command D value-Mechanical deflection-Formula (1)
The mechanical deflection amount is obtained by the mechanical deflection amount (side plate, upper and lower table, mold) = f (actual bending force).
[0086]
Measure the workpiece bending angle when bending is completed. It is desirable to measure at least two points on the left and right in the longitudinal direction of the workpiece.
[0087]
In step S6, the material constant calculation means 73 causes the material constant = f (actual bending force, actual inter-blade amount, workpiece bending angle, die condition, workpiece plate thickness) to be an actual material constant n value, F value and E (Young's modulus) are calculated. The workpiece bending angle is a finished angle, and the workpiece plate thickness is obtained from a nominal plate thickness or an actual plate thickness.
[0088]
In step S7, based on the actual material constants obtained in step S6, the adjustment value of the lever 61 of each height adjustment segment 41 for calculating the D value, L value, and workpiece angle during the main bending is calculated. Display on the operation screen.
[0089]
Based on the adjustment amount of the lever 61 displayed on the operation screen in step S8, the operator adjusts each height adjustment segment 41, and then the main bending process is performed in step S9.
[0090]
Therefore, the distance between the punch die P and the die die D is uniform over the longitudinal direction of the lower table 13, and a precise bending angle can be obtained.
[0091]
17, 18, 19, and 20 show other embodiments. 17, 18, 19, and 20, the same components as those in FIGS. 9 to 14 are denoted by the same reference numerals, and redundant description is omitted.
[0092]
17, 18, 19, and 20, a crowning setting device, that is, a height adjusting operation means 75 is provided on the front side of the lower table 13. More specifically, as shown in FIGS. 18, 19 and 20, the die holder 15 is provided with a plurality of height adjusting segments 77 at appropriate intervals in the left-right direction. The specific structure of each of the height adjusting segments 77 is the same as that described with reference to FIGS. 11 and 12, and the same components are denoted by the same reference numerals and detailed description thereof is omitted. A first link 81 is attached to the lever 61 via a pin 79.
[0093]
A fan-shaped second link 83 is attached to the upper end of the first link 81 via a pin 85, as shown in FIG. A cam roller 87 is provided on the right side of the lower portion of the second link 83. The second link 83 has a turning shaft 89 in a direction to be corrected with respect to the paper surface in FIG. 18, and can turn around the turning shaft 89.
[0094]
On the front side of the lower table 13, lever operating means 90 is provided that can be moved and positioned to a position corresponding to each lever 61. More specifically, a guide rail 91 extending in the left-right direction on the front side of the lower table 13 is laid, and a traveling carriage 95 is provided on the guide rail 91 via a slider 93 so as to be movable in the left-right direction. Yes. A support frame 97 extending in the left-right direction on the front side of the lower table 13 is provided, and a rack 99 extending in the left-right direction is provided below the support frame 97. A pinion 101 is engaged with the rack 99. A rotary shaft 103 extending in the vertical direction is rotatably mounted on the pinion 101. In addition, a driven pulley 105 is fitted to the lower portion of the rotary shaft 103. A servo motor 107 is attached to the traveling carriage 95, and a drive pulley 111 is fitted to the output shaft 109 of the servo motor 107. A timing belt 113 is wound around the driving pulley 111 and the driven pulley 105.
[0095]
With the above configuration, when the servo motor 107 is driven, the drive pulley 111 is rotated via the output shaft 109 and the driven pulley 105 is rotated via the timing belt 113. Since the rotation shaft 103 is rotated by the rotation of the driven pulley 105, the pinion 101 is moved on the rack 99 in the left-right direction. As a result, the traveling carriage 95 is moved in the left-right direction through the slider 93 while being guided by the guide rail 91.
[0096]
A servo motor 115 is attached to the lower right side of the traveling carriage 95 in FIG. 18, and a drive pulley 119 is fitted to the output shaft 117 of the servo motor 115. A plurality of guide rails 121 extending in the vertical direction are laid on the travel carriage 95. Each guide rail 121 is provided with an elevating carriage 125 that can be moved up and down via a slider 123. The elevating carriage 125 is provided with a nut member 127, and a ball screw 129 extending in the vertical direction is screwed to the nut member 127. A driven pulley 131 is attached to the lower part of the ball screw 129. In addition, a timing belt 133 is wound around the driven pulley 131 and the driving pulley 119. An upper cam plate 135 and a lower cam plate 137 are provided on the upper carriage 125.
[0097]
With the above configuration, when the servo motor 115 is driven, the drive pulley 119 is rotated via the output shaft 117. The driven pulley 131 is rotated via the timing belt 133 by the rotation of the driving pulley 119. As a result, since the ball screw 129 is rotated, the nut member 127 is moved up and down, so that the elevating carriage 125 is moved up and down through the slider 123 while being guided by the guide rail 121.
[0098]
As shown in FIG. 21, an air cylinder 139 is provided beside a height adjusting segment 77 provided between the lower table 13 and the die holder 15. When the die holder 15 side is pushed upward by the operation of the air cylinder 139, the height can be easily adjusted.
[0099]
For example, when the traveling carriage 95 is at the origin position at the left end of the press brake 1 as shown in FIGS. 17 and 18, the upper cam plate 135 and the lower cam plate 137 of the traveling carriage 95 are cam rollers on the second link 83. The traveling carriage 95 moves to the right by the rotation of the servo motor 107 from the state where 87 is sandwiched vertically. When the position reaches a predetermined height adjustment segment 77 that is calculated and determined in advance by the NC device, the upper cam plate 135 and the lower cam plate 137 sandwich the cam roller 87 of the predetermined height adjustment segment 77. Then, when the servo motor 115 is integrated upward by a predetermined amount, the second link 83 turns by a predetermined amount around the turning shaft 89, and the height adjusting segment 77 turns by a predetermined angle. The height can be adjusted upward by a predetermined amount. Prior to this step, if the air cylinder 139 shown in FIG. 21 is operated to push the die holder 15 side upward, the height can be easily adjusted.
[0100]
Another embodiment of the control device 27 in place of FIG. 14 is shown in FIG. 22, parts that are the same as the parts in FIG. 14 are given the same reference numerals, and redundant descriptions will be omitted.
[0101]
In FIG. 22, a height adjusting segment 77, a strain gauge or load cell 59, and a height adjusting operating means 75 are connected to the CPU 29. The CPU 29 is connected with a bending order / die determining means 65, a material constant calculating means 73, a ram stroke calculating means 141, and a lower table machining curve calculating means 143.
[0102]
With the above configuration, the actual bending method will be described with reference to the flowchart shown in FIG. 23. First, product information (CAD information) is input from the host NC device via the input device 31 in step S11. In step S12, the operator determines the bending order / mold (mold layout) by the bending order / mold determining means 65. Further, the height adjusting segment 77 at a predetermined position is adjusted by the height adjusting operating means 75 in the manner described above in step S13.
[0103]
In step S14, the first bending process (trial bending) is performed. In step S15, the bending force of the first bending work is calculated by the strain gauge 59, and angles after bending (three angles of the workpiece, for example, the left end, the center, and the right end) are calculated. Furthermore, the true material constants (n value, F value, E: Young's modulus) of the workpiece are calculated by f (bending force, distance between blades, angle, mold condition, plate thickness) by the material constant calculation means 73. In performing the second bending process (main bending) in step S16, the stroke value of the control axis of the ram (two axes) based on the true material constant of the workpiece, the bending force of the first bending process, and the measurement angle L ₂ Right, L ₂ Left) is obtained by the ram stroke calculating means 141.
[0104]
In order to obtain a predetermined machining curve (crowning curve) in step S17, table curve data indicating how much the height adjustment segment 77 is adjusted is calculated by the lower table machining curve calculation means 143, and the result shown in FIG. As such, it is displayed on the screen of the display device 33. On the basis of the table curve data displayed in step S18, the height adjustment segment 77 causes the height adjustment operation means 75 to readjust and set the amount of upward protrusion of the lower table as described above. The main bending process is performed in step S19.
[0105]
Therefore, the distance between the blades of the punch die P and the die die D, that is, the stroke value is uniform over the longitudinal direction of the lower table 13, and a precise bending angle can be obtained.
[0106]
In addition, this invention is not limited to embodiment mentioned above, It can implement in another aspect by making an appropriate change. In the present embodiment, the lower table 13 is fixed and the upper table 5 is reciprocated. However, the upper table 5 may be fixed and the lower table 13 may be reciprocated.
[0107]
【The invention's effect】
As can be understood from the description of the embodiment of the invention as described above, according to the invention of claim 1, a lower mold for bending a plate-shaped workpiece and a table for supporting the lower mold are provided. A plurality of mold support members are arranged in contact with each other in the longitudinal direction of the lower mold. Since load detecting means for detecting the load acting on each mold support member during bending is provided, the load acting on each mold support member during bending is detected by this load detecting means. can do.
[0108]
Based on the detected load, an accurate applied pressure can be detected, and the noise can be detected in a form that is completely removed. Further, the stroke (punch tip position) can be accurately detected.
[0109]
According to the second aspect of the present invention, the load detecting means is a strain gauge or a load cell, and is provided at the center of the lower surface of each mold support member, so that each load can be detected more accurately.
[0110]
According to the invention of claim 3, since each mold support portion of each mold support member is provided so as to be vertically adjustable, each stroke (punch tip position) can be easily adjusted.
[0111]
According to the invention of claim 4, a bending force detecting means is provided between the lower table and the die mold, and the bending force detecting means has a mold supporting portion protruding at the center of the upper surface, and Since both ends are supported by the support portion provided in the lower table and the die support member is provided with a load detecting means at the center of the lower surface, it is added to the workpiece by, for example, a punch die in order to process the workpiece. The applied pressure can be transmitted in a concentrated manner to the central portion of the mold support member supported at both ends via the die mold.
[0112]
At this time, the mold support member generates a deflection due to the applied pressure, and at the same time, the load detecting means provided on the lower surface of the mold support member can detect the distortion amount of the mold support member. In addition, since the relationship between the amount of distortion of the mold support member and the applied pressure, which is the bending force, has been compiled in a database in advance, accurate applied pressure can be detected even with very small applied pressure, and no noise components can be detected. It can be detected in the removed form. Further, the stroke (punch tip position) can be accurately detected.
[0113]
According to the invention of claim 5, since a plurality of the bending force detection means are provided adjacent to each other in the longitudinal direction of the lower table, each load detection provided on the lower surface of each elastic member by each bending force detection means. The amount of distortion of the mold support member is detected by the means. The total sum of the detected amounts of distortion is obtained. In addition, since the relationship between the amount of distortion of the mold support member and the applied pressure, which is a bending force, has been previously created in a database, more accurate applied pressure can be detected even with a small applied pressure, and noise components can be detected. It can be detected in a completely removed form. Further, the stroke (punch tip position) can be detected more accurately.
[0114]
According to the invention of claim 6, since the distance between the support points of each mold support member in each bending force detection means becomes longer in order from the center of the lower table toward the end, The distance between the blades with the die die is uniform over the longitudinal direction of the lower table, and a precise bending angle can be obtained.
[0115]
According to the invention of claim 7, height adjusting segments for adjusting a plurality of heights in the longitudinal direction of the die lower die are provided at appropriate intervals between the lower table and the die die. And a load detecting means for detecting a load acting on each of the height adjusting segments at the time of bending is provided, so that the length of the punch die and the die die is determined by each height adjusting segment. The distance between each blade in the direction is adjusted, and the load can be detected by each load detecting means. Thus, a uniform bending angle can be obtained in the longitudinal direction of the lower table.
[0116]
According to the invention of claim 8, each of the height adjusting segments includes an inverted U-shaped member, a screw mechanism for moving the inverted U-shaped member up and down, and a lever for rotating the screw mechanism. Therefore, the height of each inverted U-shaped member can be adjusted by rotating the screw mechanism of the inverted U-shaped member by turning the lever in one direction.
[0117]
According to invention of Claim 9, since the said load detection means is provided in the inverted U-shaped member, each load which an inverted U-shaped member receives by each load detection means can be detected correctly.
[0118]
According to the invention of claim 10, since the load detecting means is a strain gauge or a load cell, each load received by the inverted U-shaped member is more accurately detected.
[0119]
According to the invention of claim 11, since the height adjustment amount of each height adjustment segment is displayed on the operation screen, the height adjustment amount of each height adjustment segment is more easily adjusted. be able to.
[0120]
According to the twelfth aspect of the present invention, height adjustment segments for adjusting a plurality of heights in the longitudinal direction of the die lower die are provided at appropriate intervals between the lower table and the die die. Therefore, the height of each height adjusting segment is adjusted by the height adjusting operation means, and the distance between the respective blades (stroke value) in the longitudinal direction between the punch die and the die die can be adjusted. Thus, a uniform bending angle can be obtained in the longitudinal direction of the lower table.
[0121]
According to the invention of claim 13, each of the height adjusting segments includes an inverted U-shaped member, a screw mechanism for moving the inverted U-shaped member up and down, and a lever for rotating the screw mechanism. The height adjustment operating means is composed of lever operating means for individually operating the levers. By rotating the lever in one direction by the lever operating means, the screw mechanism is It can be rotated to adjust the height of the inverted U-shaped member.
[0122]
According to the invention of claim 14, the lever operating means can be moved and positioned to a position corresponding to each lever to adjust the height of the inverted U-shaped member of each height adjusting segment.
[0123]
According to the invention of claim 15, since the height adjustment amount of each of the height adjustment segments is displayed on the operation screen, the height adjustment amount of each height adjustment segment is more easily adjusted. be able to.
[0124]
According to a sixteenth aspect of the present invention, the tip of the punch die is pressed against a reference block or workpiece having a known height dimension placed on the die die. The applied pressure is detected by a bending force detecting means provided adjacently between the lower table and the die mold in the longitudinal direction of the lower table. The tip position of the punch die is detected from the die stroke at that time, and the workpiece can be bent using the detected tip position of the punch die as a reference position. Thus, an accurate stroke can be performed during bending.
[0125]
According to the invention of claim 17, the bending force detecting means has a mold support part protruding from the center part of the upper surface, supported at both ends by the support part provided in the lower table, and at the center part of the lower surface. It consists of a mold support member provided with a load detection means, and the distance between the support points of each mold support member becomes longer in order from the center of the lower table toward the end, so that the punch mold and the die mold The distance between the blades is uniform over the longitudinal direction of the lower table, and a precise bending angle can be obtained.
[0126]
According to the invention of claim 18, the bending order and the mold are determined based on the product information. The height adjustment amount of each height adjustment segment in the longitudinal direction of the workpiece is calculated in advance and displayed on the operation screen. The distance between the blades between the punch die and the die die and the bending width of the workpiece are calculated. Subsequently, the height of each height adjusting segment is adjusted, and trial bending is performed. The actual bending force, the distance between the blades and the bending angle between the punch die and the die die are measured. A material constant is calculated based on each measured value, and based on the calculated true material constant, the distance between the blade between the punch die and the die die, the bending width of the workpiece, and each The height adjustment amount of the height adjustment segment is calculated and displayed, the height of each height adjustment segment is readjusted, and the main bending process can be performed.
[0127]
Thus, the distance between the punch die and the die die is uniform over the longitudinal direction of the lower table, and a precise bending angle can be obtained.
[0128]
According to the invention of claim 19, the bending order and the mold are determined based on the product information. The height adjustment amount of each height adjustment segment in the longitudinal direction of the workpiece is performed. The first bending process (trial bending) is performed to calculate the bending force, the bending angle, and the true material constant of the workpiece, thereby calculating the ram stroke value. Table curve data is calculated and displayed based on the calculated ram stroke value. Then, based on the displayed table curve data, the height adjustment amount of each height adjusting segment is readjusted, and the main bending process can be performed.
[0129]
Thus, the distance between the punch die and the die die is uniform over the longitudinal direction of the lower table, and a precise bending angle can be obtained.
[Brief description of the drawings]
FIG. 1 is an enlarged front view of a state in which a punch die is in contact with a reference block in a state where the reference block is placed on a die die.
FIG. 2 is a side view of FIG.
FIG. 3 is a perspective view showing an example of a bending force detection unit.
FIG. 4 is a front view of a press brake as a bending machine.
FIG. 5 is a side view of FIG. 4;
FIG. 6 is a configuration block diagram of a control device.
FIG. 7 is an example of a database showing the relationship between strain amount and applied pressure.
FIG. 8 is an explanatory diagram for performing bending with a punch die and a die die in a state where a workpiece is placed on a die die on the center side of the machine.
9 is a front view of a press brake as another bending machine in place of FIG. 4. FIG.
10 is an enlarged view of a portion indicated by an arrow X in FIG. 9;
FIG. 11 is a perspective view of a height adjusting segment.
FIG. 12 is an enlarged sectional view of a height adjusting segment and a tension spring provided between the lower table and the die holder.
FIG. 13 is a perspective view of a state in which a plurality of height adjustment segments are connected.
FIG. 14 is a block diagram showing the configuration of another control device instead of FIG. 6;
FIG. 15 is a flowchart illustrating the operation of a bending method.
FIG. 16 is an example showing the adjustment amount of each height adjustment segment on the operation screen of the display device;
FIG. 17 is a front view of a press brake as another bending machine instead of FIG. 9;
18 is an enlarged view of the XVIII arrow view part in FIG. 17;
FIG. 19 is a side view of FIG. 18;
FIG. 20 is a plan view of a height adjusting segment.
FIG. 21 is an enlarged cross-sectional view of a height adjusting segment and an air cylinder provided between a lower table and a die holder.
FIG. 22 is a block diagram showing the configuration of another control device instead of FIG. 14;
FIG. 23 is a flowchart showing the operation of the bending method.
[Explanation of symbols]
1 Press brake (bending machine)
5 Upper table (ram)
7L, 7R Hydraulic cylinder
11 Linear scale (position detection means)
13 Lower table
15 Die holder
17 Bending force detection means
19 Mold support
21 Supporting part
23 Strain gauge (load detection means)
25 Mold support member
27 Control device
29 CPU
31 Input device
33 Display device
35 database
37 Arithmetic unit
39 Punch tip position detector
41 Height adjustment segment
43 Pulling spring
45 Inverted U-shaped member
49 Medium thread
55 Outer nut member
59 Strain gauge (load detection means)
61 Lever
65 Bending order / die determination means
67 D value and L value calculation means
69 Actual bending force calculation means
71 Actual blade amount calculation means
73 Material constant calculation means
75 Height adjustment operating means
77 Height adjustment segment
81 First link
83 Second link
87 Cam Roller
89 Rotating axis
90 Lever operating means
95 Driving Carry
99 racks
101 pinion
107 Servo motor
115 Servo motor
125 Lift Carriage
127 Nut member
129 Ball screw
135 Upper cam plate
137 Lower cam plate
139 Air cylinder
141 Ram stroke calculation means
143 Lower table machining curve calculation means
P punch mold
D die mold

Claims (19)

A plurality of mold supports having a mold support portion in the center in the longitudinal direction of the lower mold between a lower mold for bending a plate-shaped workpiece and a table supporting the lower mold. A bending apparatus comprising: a member provided in contact with each other; and a load detecting means for detecting a load acting on each mold support member during bending. 2. The bending apparatus according to claim 1, wherein the load detecting means is a strain gauge or a load cell, and is provided at a central portion of the lower surface of the mold support member. The bending apparatus according to claim 1 or 2, wherein each mold support portion of each mold support member is provided so as to be vertically adjustable. A bending apparatus for bending a workpiece by reciprocating one of a lower table having a die mold and a lower table having a punch mold to cooperate with the punch mold and the die mold. A bending force detecting means is provided between the lower table and the die mold, and the bending force detecting means has a mold supporting portion protruding at the center of the upper surface, and the support provided in the lower table. A bending apparatus characterized by comprising a mold support member supported at both ends by a portion and having a load detecting means at the center of the lower surface. The bending apparatus according to claim 4, wherein a plurality of the bending force detection means are provided adjacent to each other in the longitudinal direction of the lower table. 6. The bending apparatus according to claim 5, wherein a distance between supporting points of each mold supporting member in each bending force detecting means becomes longer in order from the center of the lower table to the end. A bending apparatus for bending a workpiece by reciprocating one of a lower table having a die mold and a lower table having a punch mold to cooperate with the punch mold and the die mold. A plurality of height adjustment segments for adjusting the height in the longitudinal direction of the die mold are provided at appropriate intervals between the lower table and the die mold, and each height at the time of bending is provided. A bending apparatus comprising load detecting means for detecting a load acting on a height adjusting segment. Each of the height adjusting segments includes an inverted U-shaped member, a screw mechanism for moving the inverted U-shaped member up and down, and a lever for rotating the screw mechanism. The bending apparatus according to claim 7. The bending apparatus according to claim 7 or 8, wherein the load detecting means is provided in an inverted U-shaped member. The bending apparatus according to claim 7, wherein the load detecting means is a strain gauge or a load cell. The bending apparatus according to claim 7, 8, 9, or 10, wherein a height adjustment amount of each height adjusting segment is displayed on an operation screen. A bending apparatus for bending a workpiece by reciprocating one of a lower table having a die mold and a lower table having a punch mold to cooperate with the punch mold and the die mold. A plurality of height adjustment segments for adjusting the height provided between the lower table and the die mold at appropriate intervals in the longitudinal direction of the die mold, and an input for inputting product information. Means, bending order / bending order determining step for determining the mold, lower table processing curve calculating means for calculating the processing curve of the lower table, and calculation data calculated from the lower table processing curve calculating means And a height adjusting operation means capable of individually adjusting and operating each of the height adjusting segments. Each of the height adjusting segments includes an inverted U-shaped member, a screw mechanism for moving the inverted U-shaped member up and down, and a lever for rotating the screw mechanism. The bending apparatus according to claim 12, wherein the actuating means comprises lever operating means for individually operating the levers. 14. The bending apparatus according to claim 13, wherein the lever operating means can be moved and positioned to a position corresponding to each lever. The bending apparatus according to claim 12, 13 or 14, wherein the calculation data calculated from the lower table processing curve calculation means is displayed on an operation screen. In a bending method for bending a workpiece by reciprocating one of a lower table provided with a die mold and a lower table provided with a punch mold and by the cooperation of the punch mold and the die mold , Detecting the bending force provided adjacent to the longitudinal direction of the lower table by pressurizing and abutting a reference block or workpiece having a known height when the tip of the punch die is placed on the die die The pressure is detected by the means, the tip position of the punch die is detected from the die stroke at that time, and the workpiece is bent using the detected tip position of the punch die as a reference position. Bending method. The bending force detection means has a mold support part protruding from the center part of the upper surface, supported at both ends by the support part provided in the lower table, and a mold support having a load detection means at the center part of the lower surface The bending method according to claim 16, comprising a member, wherein the distance between the support points of each mold support member becomes longer in order from the center of the lower table toward the end. In a bending method for bending a workpiece by reciprocating one of a lower table provided with a die mold and a lower table provided with a punch mold and by the cooperation of the punch mold and the die mold The bending order and the die are determined based on the product information, the height adjustment amount of each height adjustment segment in the longitudinal direction of the workpiece is calculated in advance and displayed on the operation screen, and the punch die and die die The distance between the blades and the bending width of the workpiece are calculated, the height of each height adjustment segment is adjusted and trial bending is performed. The actual bending force at that time, the punch mold and die mold The distance between the blades and the bending angle are measured, and the material constant is calculated based on each measured value. Based on the calculated true material constant, the punch die and the die die are Between blades, workpiece bending width and height adjustment segment Calculating the height adjustment amount of cement, the bending method and performing re-adjusted to the bending of the height of each height adjusting segment displays. In a bending method for bending a workpiece by reciprocating one of a lower table provided with a die mold and a lower table provided with a punch mold and by the cooperation of the punch mold and the die mold After determining the bending order and mold based on the product information, adjusting the height of each height adjustment segment in the longitudinal direction of the workpiece, performing test bending, the bending force, bending angle, Calculate the true material constant of the workpiece, calculate the ram stroke value, calculate the calculation data by the lower table machining curve calculation means, how much each height adjustment segment is adjusted, and calculate this Based on the data, the height adjustment amount of each height adjustment segment is displayed on the operation screen, the height of each height adjustment segment is readjusted, and then the bending is performed. Method.

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