JP2012143804A - Bending process machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bending process machine which dispenses with trial bending by performing the in-line correction of the deflection of a table during an actual bending process of a plate material.SOLUTION: The machine includes: a crowning cylinder 4 which is provided in a predetermined position of a table on at least one side of a lower table 3 or an upper table 2 and with which the amount of deflection of the table, which is generated by pressurizing force, is corrected; a deflection detecting devices 5, 6 which are composed of light emitting devices 51a, 52a, 61a, 62a for emitting the light and light receiving devices 51b, 52b, 61b, 62b for receiving the light from the light emitting devices and are mounted to an upper table 2 and a lower table 3 respectively and with which the amount of deflection, generated by the pressurizing force, is detected; and a controller 7 with which a crowning cylinder 4 is driven and controlled so that the amount of deflection detected with the deflection detecting device 5 on the side of the upper table 2 and the amount of deflection detected with the deflection detecting device 6 on the side of the lower table 3 are the same.

Description

  The present invention relates to a bending machine having a crowning function for correcting a deflection generated in a table during bending of a plate material in a bending machine for bending a plate material by pressurizing upper and lower tables.

  The bending machine arranges a plate material between a punch of an upper table and a die of a lower table, and performs bending of the plate material by applying a bending pressure to the plate material between the upper table and the lower table. In such a bending machine, the deflection of the upper table and the lower table at the time of bending is measured (see, for example, Patent Document 1), and the lower table is forced by a hydraulic cylinder (crowning cylinder) according to the measured deflection. In some cases, crowning is performed to bend and correct.

  In crowning, it is difficult to measure the amount of deflection of the upper and lower tables when bending the workpiece. Therefore, the bending amount of the upper and lower tables is measured by trial bending of the plate material. (See, for example, Patent Document 2). The bending machine described in Patent Document 2 detects the bending load of the lower table while detecting the bending load of the lower table during trial bending of the plate material, and detects the amount of displacement of the lower table and drives the crowning cylinder based on these data to lower the lower table. This adjusts the amount of deflection.

JP 2001-219222 A JP-A-11-346635

  In a bending machine, the amount of deflection of the upper and lower tables at the time of bending a plate material is unknown, so it is necessary to perform trial bending. Since trial bending is performed, conventionally, there is a problem that it takes time to process the product.

  Accordingly, an object of the present invention is to provide a bending machine that eliminates the need for trial bending by correcting in-line the deflection of the table in the actual bending process of the plate material.

  According to a first aspect of the present invention, there is provided a bending machine having an upper table mounted with a punch and moved up and down by a driving device, and a lower table mounted with a die for bending a plate material by the punch under the pressure of the upper table. And a crowning cylinder that is provided at a predetermined position of at least one of the lower table and the upper table and corrects the amount of deflection of the table generated by the applied pressure, a light emitter that emits light, and light from the light emitter. It comprises a light receiver for receiving light, is attached to each of the upper table and the lower table, detects a deflection amount generated by the applied pressure, a deflection amount detected by the deflection detection device on the upper table side, and the The class is adjusted so that the amount of deflection detected by the deflection detection device on the lower table side is the same. Characterized in that it comprises a control unit for driving and controlling the training cylinder.

  Invention of Claim 2 is a bending machine of Claim 1, Comprising: The said bending | flexion detection apparatus is respectively provided in the left-right position of the length direction of the said upper table and the lower table, It is characterized by the above-mentioned. To do.

  Invention of Claim 3 is a bending machine of Claim 1 or 2, Comprising: Either one of the said light emitter or light receiver is provided in the center part of the length direction of an upper table and a lower table, and the other Are provided at both end portions in the length direction.

  A fourth aspect of the present invention is the bending machine according to any one of the first to third aspects, wherein the light receiver measures a position where light from the light emitter is incident.

  According to the first aspect of the present invention, the deflection detection device attached to the upper table and the lower table detects the deflection amount of the table generated by bending the plate material, and the control device assumes that the deflection amounts of the upper and lower tables are the same. Since the crowning cylinder is driven as described above, the deflection of the upper and lower tables can be corrected at the time of actual bending of the plate material. For this reason, in-line deflection correction is possible, and trial bending is not required, so that product processing that does not require labor can be performed.

  According to the second aspect of the present invention, a pair of deflection detection devices are provided at the left and right positions in the length direction of the upper and lower tables, and the deflection is detected on the left and right sides of the table. For this reason, the deflection of the upper and lower tables can be accurately detected, and the deflection can be corrected with high accuracy.

  According to the invention of claim 3, either one of the light emitter or the light receiver is provided in the center portion in the length direction of the upper table and the lower table, and the other is provided in both end portions in the length direction. The deflection detecting device is provided along the length direction of the upper and lower tables, and the deflection generated in the upper and lower tables can be detected in the length direction of the table. As a result, the deflection can be accurately detected, and the deflection can be corrected with high accuracy.

  According to the fourth aspect of the invention, since the light receiver measures the position where the light from the light emitter enters, the light receiver can detect the amount of deflection of the upper and lower tables. For this reason, the deflection amount of the upper and lower tables can be easily detected.

1 is an overall front view of a bending machine according to an embodiment of the present invention. (A) And (b) is a front view which shows the detection of the light by a light receiver. It is a front view which shows the relationship between the deflection by a deflection | deviation detection apparatus, and the deflection of a table.

  Hereinafter, a bending machine according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view of the entire bending machine 1, FIG. 2 is a front view showing detection of light by a light receiver, and FIG. 3 is a front view showing the relationship between the deflection of the deflection detector and the deflection of the table.

  As shown in FIG. 1, the bending machine 1 includes an upper table 2, a lower table 3, a crowning cylinder 4, an upper deflection detection device 5, a lower deflection detection device 6, and a control device 7.

  The upper table 2 and the lower table 3 are provided on the frame 8 so as to face each other. For example, the upper table 2 moves up and down with respect to the lower table 3 (the lower table 3 is provided integrally with the frame 8). The upper table 2 moves up and down with respect to the frame 8). In order to raise and lower the upper table 2, the upper part of the upper table 2 is connected to a pressure cylinder 13 as a driving device. When the piston rod of the pressurizing cylinder 13 is extended, the upper table 2 is lowered and presses the plate material 9 with the lower table 3.

  The bending of the plate material 9 is performed by sandwiching the plate material 9 by the punch 11 and the die 12 and applying pressure to the plate material 9. The punch 11 is mounted, for example, on the lower surface of the upper table 2, and the die 12 is mounted, for example, on the upper surface of the lower table 3 so as to face the punch 11. The pressing force for bending the plate material 9 is performed by lowering the upper table 2 and sandwiching and pressing the plate material 9 by the punch 11 and the die 12. In this bending process, the upper table 2 and the lower table 3 are bent as shown in FIG.

  The crowning cylinder 4 is provided inside (inward) the lower table 3. The crowning cylinder 4 deflects the lower table 3 in accordance with, for example, the deflection generated in the upper table 2 when bending the plate material 9. As shown in FIG. 3, the deflection occurs in the upper and lower tables 2 and 3 such that the central portions in the length direction are greatly curved (curved in a concave shape). For this reason, the crowning cylinder 4 is provided corresponding to the central portion in the length direction of the lower table 3 so that the central portion (intermediate portion) in the length direction of the lower table 3 is curved (curved in a convex shape). Yes.

  The upper deflection detection device 5 detects the amount of deflection generated in the upper table 2. In this embodiment, the upper deflection detection device 5 is provided as a pair at the left and right positions in the length direction of the upper table 2, and includes a left side detection unit 51 and a right side detection unit 52. The left side detection unit 51 and the right side detection unit 52 are formed by a pair of light emitters 51a and 52a and light receivers 51b and 52b, respectively.

  The lower deflection detection device 6 detects the amount of deflection generated in the lower table 3. Similarly to the upper deflection detection device 5, the lower deflection detection device 6 is provided as a pair at the left and right positions in the length direction of the lower table 3, as with the upper deflection detection device 5. 62. The left side detection unit 61 and the right side detection unit 62 are formed by a pair of light emitters 61a and 62a and light receivers 61b and 62b, respectively, similarly to the upper deflection detection device 5.

  For example, a laser oscillator that oscillates laser light is used as the light emitters 51a, 52a, 61a, and 62a in the upper and lower deflection detection devices 5 and 6, and the light receivers 51b, 52b, 61b, and 62b correspond to the corresponding light emitters 51a and 52a. And the light receiving sensor which receives the light from 61a and 61b is used.

  The light receivers 51b, 52b and 61b, 62b are light receiving sensors that can measure the positions where light from the corresponding light emitters 51a, 52a and 61a, 62a is incident. A sensor or PSD (optical position sensor) is used.

  FIG. 2 shows a light detection state of the left side detection unit 51 in the upper deflection detection device 5. FIG. 2A shows a detection state of the light receiver 51b in a state where the upper table 2 does not generate deflection. In a state where no deflection occurs, the light receiver 51b receives light from the light emitter 51a at a position L0. FIG. 2B shows a detection state of the light receiver 51b in a state in which the upper table 2 has been bent by bending the plate material 9. In a state in which a predetermined amount of deflection has been generated, the light receiver 51b has a light emitter 51a. Is received at a position L1. Thus, the deflection amount of the upper table 2 can be detected as (L1-L0) by changing the incident position of the light to the light receiver 51b before and after the occurrence of the deflection. For this reason, the amount of deflection of the upper table 2 can be easily detected. The detection structure by the left side detection unit 51 is the same as that of the right side detection unit 52 and the left side detection unit 61 and the right side detection unit 62 in the lower deflection detection device 6.

  In this embodiment, the light emitters 51a, 52a and 61a, 62a are disposed outside the pressurizing cylinder 13 at both end portions in the length direction of the upper table 2 and the lower table 3, and the light receivers 51b, 52b, 61b and 62b are arrange | positioned in the center part of the length direction of the upper table 2 and the lower table 3. As shown in FIG. Thus, the light receivers 51b, 52b and 61b, 62b are provided in the central portions in the length direction of the upper table 2 and the lower table 3, thereby detecting the light shown in FIG. 2 (detecting the amount of deflection of the tables 2 and 3). ) Can be detected at the portion where the deflection is greatest. As a result, it is possible to accurately detect deflections occurring in the upper and lower tables 2 and 3, and to perform deflection correction by the crowning cylinder 4 described later with high accuracy.

  The control device 7 receives detection results detected by the light receivers 51b, 52b and 61b, 62b in the upper deflection detection device 5 and the lower deflection detection device 6, and controls the driving of the crowning cylinder 4 based on the detection results. The control device 7 includes a calculation unit 71 and a control unit 72. The calculation unit 71 receives the detection results of the light receivers 51b, 52b and 61b, 62b before and after the deflection occurs in the upper and lower tables 2 and 3, and based on the input detection results, the upper and lower tables 2 and 2 are input. 3 is calculated. The controller 72 controls the driving of the crowning cylinder 4 so that the deflection amount of the lower table 3 is the same as the deflection amount generated in the upper table 2. Thereby, the deflection amount of the upper and lower tables 2 and 3 can be corrected.

  Next, a specific example of deflection correction will be described with reference to FIG. FIG. 3 shows the deflection when the plate material 9 is bent by the punch 11 and the die 12 as the upper table 2 descends.

  Before the occurrence of a deflection in which the plate member 9 is not pressurized, the light receiver 51b of the left detection unit 51 of the upper deflection detection device 5 detects light at the position L0, and the light receiver 52b of the right detection unit 52 emits light at the position R0. To detect. In the left side detector 61 of the lower deflection detector 6, the light receiver 61b detects light at the position M0, and in the right side detector 62, the light receiver 62b detects light at the position N0.

  When the plate material 9 is pressed and bent, the upper and lower tables 2 and 3 are bent. In the upper table 2, a deflection amount of Z1 occurs, and also in the lower table 3, deflection occurs. After this deflection occurs, the light receiver 51b of the left detector 51 of the upper deflection detector 5 detects light at the position L1, and the light receiver 52b of the right detector 52 detects light at the position R1. In the left side detector 61 of the lower deflection detector 6, the light receiver 61b detects light at a predetermined position, and in the right side detector 62, the light receiver 62b detects light at the position.

  The calculation unit 71 of the control device 7 calculates the deflection amount Z1 of the upper table 2 from (L1-L0) or (R1-R0). Further, the control unit 72 of the control device 7 drives the crowning cylinder 4 so as to be equal to the deflection amount Z1 of the upper table 2 calculated by the calculation unit 71 and the deflection amount Z2 of the lower table 3. That is, the control unit 72 of the control device 7 drives the crowning cylinder 4 so that the light receiver 61b detects light at the position M1 and the light receiver 62b detects light at the position N1. Accordingly, the bending amount of the upper table 2 (concave deflection amount) and the deflection amount of the lower table 3 (convex deflection amount) become the same, and the plate material 9 can be bent while the deflection amount is corrected. it can.

  In such an embodiment, the deflection detection devices 5 and 6 attached to the upper table 2 and the lower table 3 detect the deflection amount Z1 of the upper table 2 generated by bending the plate material 9, and the control device 7 moves the upper and lower Since the crowning cylinder 4 of the lower table 3 is driven so that the deflection amount of the tables 2 and 3 is the same, the deflection of the upper and lower tables 2 and 3 can be corrected at the time of actual bending of the plate 9. For this reason, in-line deflection correction becomes possible, trial bending becomes unnecessary, and product processing that does not require much labor is possible.

  In addition, a pair of deflection detection devices 5 and 6 are provided at the left and right positions in the length direction of the upper and lower tables 2 and 3, and the upper and lower tables 2 are detected in order to detect deflection at the left and right of each table 2 and 34. , 3 can be accurately detected, and highly accurate deflection correction can be performed.

  In addition, the light receivers 51b, 52b and 61b, 62b are provided in the central part in the length direction of the upper and lower tables 2, 3, and the deflection is detected at the largest part, so that the deflection amount can be accurately detected. This enables high-precision deflection correction.

  In the above embodiment, a pair of detection units 51, 52, 61, and 62 are provided at the left and right positions in the length direction for each of the upper table 2 and the lower table 3. On the other hand, the detection unit may be provided on either the left side or the right side in the length direction.

  Further, in the deflection detecting devices 5 and 6, the light receivers 51b, 52b and 61b and 62b are provided at the center in the length direction of the upper and lower tables 2 and 3, and the light emitters 51a, 52a and 61a and 62a are provided on the upper and lower tables. Although it is provided at both end portions in the length direction of 2 and 3, it may be reversed. That is, the light receivers 51b, 52b and 61b, 62b are provided at both ends in the length direction of the upper and lower tables 2 and 3, and the light emitters 51a, 52a and 61a, 62a are located in the center of the upper and lower tables 2 and 3 in the length direction. You may provide in a part.

  Further, although the crowning cylinder 4 is provided on the lower table 3, it may be provided on the upper table 2 or on both the upper table 2 and the lower table 3.

1 Bending Machine 2 Upper Table 3 Lower Table 4 Crowning Cylinder 5 Upper Deflection Detection Device 6 Lower Deflection Detection Device 7 Control Device 9 Plate Material 11 Punch 12 Die 13 Pressure Cylinder (Drive Device)
51, 61 Left side detector 52, 62 Right side detector 51a, 52a, 61a, 62a Light emitter 51b, 52b, 61b, 62b Light receiver

Claims (4)

An upper table (2) to which a punch (11) is attached and which is moved up and down by a driving device (13);
A lower table (3) to which a die (12) for bending the plate material (9) by the punch (11) is attached under the pressure of the upper table (2);
A crowning cylinder (4) which is provided at a predetermined position of at least one of the lower table (3) and the upper table (2) and corrects the amount of deflection of the table generated by the applied pressure;
The upper table includes a light emitter (51a, 52a, 61a, 61b) that emits light and a light receiver (51b, 52b, 61b, 62b) that receives light from the light emitters (51a, 52a, 61a, 61b). (2) and a deflection detection device (5, 6) attached to each of the lower table (3) for detecting the amount of deflection generated by the applied pressure;
The crowning cylinders (so that the deflection amount detected by the deflection detection device (5) on the upper table (2) side and the deflection amount detected by the deflection detection device (6) on the lower table (3) side are the same) 4. A bending machine (1) comprising a control device (7) for driving and controlling 4). Bending machine (1) according to claim 1,
A bending machine (1), wherein a pair of the deflection detection devices (5, 6) is provided at left and right positions in the longitudinal direction of the upper table (2) and the lower table (3), respectively. The bending machine (1) according to claim 1 or 2,
Either one of the light emitters (51a, 52a, 61a, 61b) or the light receivers (51b, 52b, 61b, 62b) is provided at the central portion in the longitudinal direction of the upper table (2) and the lower table (3). The bending machine (1) is characterized in that the other is provided at both end portions in the length direction. The bending machine (1) according to any one of claims 1 to 3,
The bending machine (1) characterized in that the light receivers (51b, 52b, 61b, 62b) measure positions where light from the light emitters (51a, 52a, 61a, 61b) is incident.

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