Feeding angle correction method and bending center

Abstract

The application discloses a feeding angle correction method and a bending center, wherein the feeding angle correction method comprises the following steps: preliminarily aligning a specified edge of a plate with a tool of the bending center; after the preliminary alignment, driving the plate to move along a feeding direction to the tool by a feeding shaft until the plate triggers at least one pair of sensors; recording a pair of position parameters of the feeding shaft by a control center; obtaining a compensation rotation angle between the specified edge and the tool according to the recorded pair of position parameters; before the feeding shaft continues to drive the plate to move along the feeding direction to the tool, judging whether to control a rotating shaft to rotate the plate based on the compensation rotation angle to reduce an actual angle between the specified edge and the tool according to a ratio of the compensation rotation angle and an upper threshold value and a predetermined ratio; and the two-point position parameter measurement method is used to predict the deflection angle of the plate, which is beneficial to eliminating the measurement error and improving the alignment accuracy of the plate.

Description

Technical Field

[0001] This invention relates to the field of machine tool control technology, and in particular to a feeding angle correction method and a bending center. Background Technology

[0002] In the field of machine tool control technology, when bending sheet metal, traditional manual measurement or mechanical limit devices are often used to correct the sheet metal. Manual measurement is affected by subjective factors, which can lead to measurement deviations. Mechanical limit devices are usually installed on the rotating shaft to limit the rotation range of the rotating shaft, but the calibration accuracy of the limit device for angle is limited.

[0003] In addition, a prior art solution, such as US11027323B2, discloses a method and apparatus for automatically calibrating a wire bending machine. The bending machine bends the steel wire, and the bending angle is obtained by taking pictures of the bent steel wire. The bending angle is stored for bending calibration. However, the bending angle is prone to deviation when determined by the image, which is not suitable, especially in high-precision sheet metal processing fields such as automobile manufacturing, and is not efficient. Summary of the Invention

[0004] The technical problem solved by this invention is to provide a feeding angle correction method and a bending center to ensure bending effect while improving bending efficiency.

[0005] To solve the above-mentioned technical problems, the present invention provides a feeding angle correction method and a bending center. The feeding angle correction method is applicable to bending centers and includes: initially aligning a specified edge of the sheet metal with a cutting tool at the bending center, where the specified edge is the edge of the sheet metal opposite to the cutting tool; after initial alignment, the feeding shaft of the bending center drives the sheet metal to move along the feeding direction toward the cutting tool at the bending center until the sheet metal triggers at least one pair of sensors at the bending center; the control center of the bending center records a pair of position parameters of the feeding shaft, which correspond to the triggering of the pair of sensors by the sheet metal; based on the recorded pair of position parameters, the control center obtains a compensation rotation angle between the specified edge and the cutting tool; before the feeding shaft continues to drive the sheet metal to move along the feeding direction toward the cutting tool, based on the ratio of the compensation rotation angle to a preset upper limit threshold in the control center and a preset predetermined ratio in the control center, the control center determines whether to directly control the rotating shaft to rotate the sheet metal based on the compensation rotation angle, thereby reducing the actual angle between the specified edge and the cutting tool.

[0006] Optionally, after initial alignment and before feeding, the rotating shaft is fixedly connected to a preset area of ​​the sheet material.

[0007] Optionally, the preset area is the central area of ​​the board material.

[0008] Optionally, the method for the control center to determine whether to directly control the rotating shaft to rotate the plate based on the ratio of the compensated rotation angle to the upper limit threshold preset in the control center, and a predetermined ratio preset in the control center, further includes: if the ratio of the compensated rotation angle to the upper limit threshold is less than the predetermined ratio, the control center controls the rotating shaft to rotate the plate based on the compensated rotation angle; if the ratio of the compensated rotation angle to the upper limit threshold is equal to or greater than the predetermined ratio, the feeding shaft drives the plate to retract a predetermined distance in the opposite direction of the feeding direction; after retracting the predetermined distance, the rotating shaft rotates the plate to compensate for the rotation angle; after rotating the plate to compensate for the rotation angle, the feeding shaft continues to drive the plate to move towards the cutter in the feeding direction until the plate triggers at least one pair of sensors.

[0009] Optionally, if the ratio of the compensated rotation angle to the upper limit threshold is equal to or greater than the preset ratio, before the feeding shaft continues to drive the plate to move towards the cutter along the feeding direction, the method of the control center controlling the rotating shaft to rotate the plate further includes: preliminarily aligning the specified edge of the plate that has been rotated by the compensated rotation angle with the cutter at the bending center again.

[0010] Optionally, the pre-order ratio is 1.

[0011] Optionally, before initial alignment, a coordinate system is established in the control center based on the position of the feed axis; the method by which the control center obtains the compensation rotation angle between the specified edge and the tool based on a pair of recorded position parameters includes: obtaining the compensation rotation angle α based on the coordinates A(X1, Y1), B(X2, Y2) of the pair of position parameters in the coordinate system, and the distance d between the pair of sensors. .

[0012] Optionally, the sensor is a point laser sensor, located on the feed side of the cutter, and the direction of the laser emitted by the sensor is perpendicular to the cutter; when the sensor is triggered, a light spot is formed on the board.

[0013] Optionally, the method for the feeding shaft at the bending center to drive the plate to move toward the cutting tool at the bending center along the feeding direction includes: the feeding shaft driving the plate to move at a first speed until there is a first gap between the specified edge and the sensor; when there is a first gap between the specified edge and the sensor, the feeding shaft stops; after the feeding shaft stops, it drives the plate to move at a second speed until the plate triggers at least one pair of sensors at the bending center, the second speed being less than the first speed.

[0014] Optionally, before initial alignment, the dimensional parameters of the sheet metal are entered into the control center; before initial alignment, the sheet metal is placed on the machine tool surface at the bending center; after initial alignment, based on the entered dimensional parameters of the sheet metal, the control center obtains the coordinate range of the aligned center area in the coordinate system, as well as the distance between the aligned specified edge and the tool. The aligned center area and the aligned specified edge are the center area and the specified edge of the sheet metal in the sheet metal position after initial alignment, respectively.

[0015] The technical solution of the present invention also provides a bending center for performing the feeding angle correction method described above to bend the sheet metal.

[0016] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: In the feeding angle correction method and bending center provided by the technical solution of the present invention, after initial alignment, the feeding shaft of the bending center drives the plate to move along the feeding direction toward the cutting tool of the bending center until the plate triggers at least one pair of sensors of the bending center. Furthermore, the control center of the bending center records a pair of position parameters of the feeding shaft, which correspond to the plate triggering a pair of sensors. Therefore, when the specified edge of the plate reaches the position near the cutting tool, a pair of position parameters of the feeding shaft at that position are obtained. The pair of position parameters of the feeding shaft corresponds to the two positions of the triggering sensors in the specified edge. Thus, obtaining the pair of position parameters of the feeding shaft at that position can characterize the deflection when the specified edge reaches the position near the cutting tool. Based on this, the control center obtains the compensation rotation angle between the specified edge and the cutter according to a pair of recorded position parameters. Before the feeding shaft continues to drive the plate towards the cutter along the feeding direction, the control center determines whether to directly control the rotating shaft to rotate the plate based on the ratio of the compensation rotation angle to the upper limit threshold preset in the control center and the predetermined ratio preset in the control center, so as to reduce the actual angle between the specified edge and the cutter. Therefore, before the specified edge of the plate reaches the position near the cutter and is bent, the plate with positional deviation is automatically analyzed and calibrated. In addition to fine calibration, a coarse calibration mechanism is added to avoid the error of the tooth gap that cannot be completely eliminated by a single calibration after the angle error is too large. This ensures measurement accuracy while maintaining high bending efficiency. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating a feeding angle correction method in one embodiment of the present invention; Figure 2 yes Figure 1 A flowchart illustrating step S04; Figure 3This is a schematic diagram illustrating the positional relationship between the plate, the sensor, and the cutting tool in one embodiment of the present invention.

[0018] Figure label: Board material 10, specified edge 11; 20 cutting tools, 30 sensors; Compensation rotation angle α; Feeding direction X. Detailed Implementation

[0019] As described in the background section, existing plate position calibration methods have limited accuracy and low efficiency.

[0020] To solve the above-mentioned technical problems, in the feeding angle correction method provided by the technical solution of the present invention, after initial alignment, the feeding shaft at the bending center drives the plate to move along the feeding direction toward the cutting tool at the bending center until the plate triggers at least one pair of sensors at the bending center. Furthermore, the control center of the bending center records a pair of position parameters of the feeding shaft, which correspond to the plate triggering a pair of sensors. Therefore, when the specified edge of the plate reaches the position near the cutting tool, a pair of position parameters of the feeding shaft at that position are obtained. The pair of position parameters of the feeding shaft corresponds to the two positions of the triggering sensors in the specified edge. Thus, the pair of position parameters of the feeding shaft at that position can characterize the deflection when the specified edge reaches the position near the cutting tool. Based on this, the control center obtains the compensation rotation angle between the specified edge and the cutter according to a pair of recorded position parameters. Before the feeding shaft continues to drive the plate towards the cutter along the feeding direction, the control center determines whether to directly control the rotating shaft to rotate the plate based on the ratio of the compensation rotation angle to the upper limit threshold preset in the control center and the predetermined ratio preset in the control center, so as to reduce the actual angle between the specified edge and the cutter. Therefore, before the specified edge of the plate reaches the position near the cutter and is bent, the plate with positional deviation is automatically analyzed and calibrated. In addition to fine calibration, a coarse calibration mechanism is added to avoid the error of the tooth gap that cannot be completely eliminated by a single calibration after the angle error is too large. This ensures measurement accuracy while maintaining high bending efficiency.

[0021] To make the above-mentioned objectives, features, and beneficial effects of the present invention more apparent and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus. Additionally, directional terms such as above, below, up, down, upward, downward, left, right, etc., are used relative to exemplary embodiments as they are shown in the figures, with upward or upper directions pointing towards the top of the corresponding figure and downward or lower directions pointing towards the bottom of the corresponding figure.

[0023] Figure 1 This is a flowchart illustrating a feeding angle correction method according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the positional relationship between the plate 10, the sensor 30 and the cutting tool in one embodiment of the present invention.

[0024] Please refer to Figure 1 and Figure 3 The feeding angle correction method includes: step S02, initially aligning the designated edge 11 of the plate 10 with the cutting tool 20 at the bending center, wherein the designated edge 11 is the edge of the plate 10 opposite to the cutting tool 20.

[0025] Please continue to refer to this. Figure 1 and Figure 3 The feeding angle correction method also includes: step S04, where the feeding shaft at the bending center drives the plate 10 to move along the feeding direction X towards the cutting tool 20 at the bending center until the plate 10 triggers at least one pair of sensors 30 at the bending center.

[0026] Specifically, the sensor 30 is a point laser sensor. Each sensor 30 is fixed to the feed side of the cutter 20 through a positioning hole. The distance between adjacent sensors 30 is precisely positioned by using a graduated ruler. The direction of the laser emitted by the sensor 30 is perpendicular to the cutter 20. When the sensor 30 is triggered, a light spot is formed on the plate 10.

[0027] Furthermore, the sensor 30 adopts an IO trigger type, with a detection stroke range of 0mm to 100mm, a formed light spot size of 0.5mm, and a response speed of less than 1ms.

[0028] In other embodiments, two or more sensors 30 may be provided depending on the size of the plate 10.

[0029] Please continue to refer to this. Figure 1 and Figure 3 The feeding angle correction method also includes: step S05, where the control center of the bending center records a pair of position parameters of the feeding shaft, and the pair of position parameters of the feeding shaft corresponds to the triggering of a pair of sensors 30 on the board 10.

[0030] Please continue to refer to this. Figure 1 and Figure 3 The feeding angle correction method also includes step S06, whereby the control center obtains the compensation rotation angle α between the specified edge 11 and the tool 20 based on a pair of recorded position parameters.

[0031] Please continue to refer to this. Figure 1 and Figure 3 The feeding angle correction method also includes step S07, which, based on the ratio of the compensation rotation angle α to the upper limit threshold preset in the control center and the predetermined ratio preset in the control center, determines whether to directly control the rotating shaft to rotate the plate 10 based on the compensation rotation angle α, so as to reduce the actual angle between the specified edge 11 and the tool 20.

[0032] In the feeding angle correction method of this embodiment, after initial alignment, the feeding shaft at the bending center drives the plate 10 to move along the feeding direction X towards the cutting tool 20 at the bending center until the plate 10 triggers at least one pair of sensors 30 at the bending center. The control center of the bending center records a pair of position parameters of the feeding shaft, which correspond to the triggering of the pair of sensors 30 by the plate 10. Therefore, when the designated edge 11 of the plate 10 reaches the position near the cutting tool 20, a pair of position parameters of the feeding shaft at that position are obtained. The pair of position parameters of the feeding shaft corresponds to the two positions of the triggering sensors 30 in the designated edge 11. Thus, the pair of position parameters of the feeding shaft at that position can characterize the deflection when the designated edge 11 reaches the position near the cutting tool 20. Based on this, the control center obtains the compensation rotation angle α between the designated edge 11 and the cutter 20 according to a pair of recorded position parameters. Before the feeding shaft continues to drive the plate 10 to move along the feeding direction X towards the cutter 20, the control center determines whether to directly control the rotating shaft to rotate the plate 10 based on the ratio of the compensation rotation angle α to the upper limit threshold preset in the control center and the predetermined ratio preset in the control center, so as to reduce the actual angle between the designated edge 11 and the cutter 20. Therefore, before the designated edge 11 of the plate 10 reaches the position near the cutter 20 and is bent, the plate 10 with positional deviation is automatically analyzed and calibrated. In addition to fine calibration, a coarse calibration mechanism is added to avoid the error of the tooth gap that cannot be completely eliminated by a single calibration after the angle error is too large. This ensures measurement accuracy while maintaining high bending efficiency.

[0033] For further details, please refer to... Figure 2 , Figure 2 yes Figure 1 The flowchart of step S04 shows that, for step S04, the method by which the feeding shaft at the bending center drives the plate 10 to move along the feeding direction X towards the cutting tool 20 at the bending center includes: In step S041, the feeding shaft drives the plate 10 to move at a first speed until there is a first gap between the designated edge 11 and the sensor 30; Step S042: When there is a first gap between the specified edge 11 and the sensor 30, the feeding shaft is paused; In step S043, after the feeding shaft pauses, it moves the plate 10 at a second speed until the plate 10 triggers at least one pair of sensors 30 at the bending center.

[0034] Furthermore, the second speed is less than the first speed; the specific dimensions of the first gap are determined by the accuracy of the initial alignment and the dimensional error of the board 10.

[0035] In this embodiment, the first speed is 700 mm / s and the second speed is 10 mm / s.

[0036] For further information, please refer to the following: Figure 1 and Figure 3 Before performing step S02, the feeding angle correction method also includes: step S01, inputting the dimensional parameters of the plate 10 into the control center, placing the plate 10 on the machine tool surface at the bending center, and establishing a coordinate system in the control center according to the position of the feeding axis.

[0037] Specifically, the surface is treated with wear-resistant material and equipped with positioning devices such as stop blocks and rulers to facilitate initial alignment between the designated edge 11 and the cutter 20.

[0038] In this embodiment, the plate 10 is initially aligned by using blocks on the sheet surface.

[0039] For further information, please refer to the following: Figure 1 and Figure 3 After performing step S02 and before feeding, the feeding angle correction method further includes performing step S03, fixing the rotating shaft in a preset area of ​​the plate 10.

[0040] Furthermore, the rotating shaft is pressed or adsorbed within a preset area of ​​the plate 10.

[0041] In this embodiment, the preset area is the central area of ​​the board 10.

[0042] Specifically, after executing step S02, based on the size parameters of the plate 10 entered in step S01, the control center obtains the coordinate range of the aligned center area in the coordinate system, as well as the distance between the aligned specified edge 11 and the tool 20. The aligned center area and the aligned specified edge are the center area of ​​the plate 10 and the specified edge 11 of the plate 10 after the initial alignment, respectively.

[0043] Furthermore, regarding step S06, the method by which the control center obtains the compensation rotation angle α includes: obtaining the compensation rotation angle α based on the coordinates A(X1, Y1) and B(X2, Y2) of a pair of position parameters in the coordinate system, and the distance d between a pair of sensors 30. .

[0044] Regarding step S07, the method by which the control center determines whether to directly control the rotation axis to rotate the plate 10 based on the ratio of the compensated rotation angle α to the upper limit threshold preset in the control center, and the predetermined ratio preset in the control center, includes: If the ratio of the compensation rotation angle α to the upper limit threshold is less than the preset ratio, then step S071 is executed, and the control center directly controls the rotation axis to rotate the plate 10 based on the compensation rotation angle α.

[0045] For further information, please refer to the following: Figure 1 and Figure 3 After executing step S071, step S08 is executed, and the feeding shaft continues to drive the plate 10 to move along the feeding direction X-axis of the cutting tool 20.

[0046] If the ratio of the compensation rotation angle α to the upper limit threshold is equal to or greater than the predetermined ratio, then step S072 is executed, and the feeding shaft drives the plate 10 to retract a predetermined distance in the opposite direction of the feeding direction X, so as to ensure that the designated edge 11 of the plate 10 is far away from the trigger boundary of the sensor 30.

[0047] Furthermore, the preset retraction distance is twice the first spacing in step S041.

[0048] In this embodiment, the predetermined ratio is 1, the first spacing is 20 mm, and the preset back distance is greater than 40 mm.

[0049] For further information, please refer to the following: Figure 1 and Figure 3 Based on step S072, the feeding angle correction method further includes: after retracting a preset distance, step S09 is executed, in which the rotating shaft rotates the plate 10 to compensate for the rotation angle α, so that the specified edge 11 and the tool 20 tend to be parallel.

[0050] For further information, please refer to the following: Figure 1 and Figure 3 Based on step S09, the feeding angle correction method further includes: If step S10 is executed for the first time, return to step S04 until the board 10 triggers at least one pair of sensors 30; then, continue executing steps S05 to S07. If step S10 is executed again, then step S11 is executed, the feeding shaft 10 stops moving, and the control center performs a calibration alarm.

[0051] Step S10 involves: re-aligning the designated edge 11 of the plate 10, which has been rotated by a compensating rotation angle α, with the cutting tool 20 at the bending center.

[0052] Accordingly, one embodiment of the present invention also provides a bending center for bending the sheet metal 10 based on the feeding angle correction method described above.

[0053] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A method for correcting a feeding angle, characterized in that, Applicable to the bending center, the feeding angle correction method includes: The designated edge of the sheet metal is initially aligned with the cutter at the bending center. The designated edge is the edge of the sheet metal opposite to the cutter. After the initial alignment, the feeding shaft at the bending center drives the sheet metal to move along the feeding direction toward the cutter at the bending center until the sheet metal triggers at least one pair of sensors at the bending center; The control center at the bending center records a pair of position parameters of the feeding shaft, and the pair of position parameters of the feeding shaft corresponds to the triggering of the plate to the pair of sensors; Based on the recorded pair of position parameters, the control center obtains the compensated rotation angle between the designated edge and the tool; Before the feeding shaft continues to drive the plate to move toward the cutter along the feeding direction, the control center determines whether to directly control the rotating shaft to rotate the plate based on the ratio of the compensation rotation angle to the upper limit threshold preset in the control center and the predetermined ratio preset in the control center, so as to reduce the actual angle between the specified edge and the cutter.

2. The feeding angle correction method according to claim 1, characterized in that, After the initial alignment and before feeding, the rotating shaft is fixedly connected to a preset area of ​​the plate.

3. The feeding angle correction method according to claim 2, characterized in that, The preset area is the central area of ​​the board material.

4. The feeding angle correction method according to claim 1, characterized in that, The method for determining whether to directly control the rotation axis to rotate the plate based on the ratio of the compensated rotation angle to a preset upper limit threshold in the control center, and a preset predetermined ratio value in the control center, further includes: If the ratio of the compensated rotation angle to the upper limit threshold is less than the predetermined ratio, the control center controls the rotation axis to rotate the plate based on the compensated rotation angle; If the ratio of the compensated rotation angle to the upper limit threshold is equal to or greater than the preset ratio, the feeding shaft drives the plate to retract a preset distance in the opposite direction of the feeding direction; after retracting the preset distance, the rotating shaft rotates the plate by the compensated rotation angle; after rotating the plate by the compensated rotation angle, the feeding shaft continues to drive the plate to move towards the cutter in the feeding direction until the plate triggers the at least one pair of sensors.

5. The feeding angle correction method according to claim 4, characterized in that, If the ratio of the compensation rotation angle to the upper limit threshold is equal to or greater than the preset ratio, before the feeding shaft continues to drive the plate to move toward the cutter along the feeding direction, the method of the control center controlling the rotating shaft to rotate the plate further includes: preliminarily aligning the designated edge of the plate that has rotated by the compensation rotation angle with the cutter at the bending center again.

6. The feeding angle correction method according to claim 4, characterized in that, The predetermined ratio is 1.

7. The feeding angle correction method according to claim 1, characterized in that, Also includes: Prior to the initial alignment, a coordinate system is established in the control center based on the position of the feed shaft; The method by which the control center obtains the compensation rotation angle between the designated edge and the tool based on the recorded pair of position parameters includes: obtaining the compensation rotation angle α based on the coordinates A (X1, Y1), B (X2, Y2) in the coordinate system and the distance d between the pair of sensors, according to the recorded pair of position parameters. .

8. The feeding angle correction method according to claim 1, characterized in that, The sensor is a point laser sensor, located on the feed side of the cutter, and the direction of the laser emitted by the sensor is perpendicular to the cutter; when the sensor is triggered, a light spot is formed on the plate.

9. The feeding angle correction method according to claim 1, characterized in that, The method by which the feeding shaft at the bending center drives the plate to move toward the cutting tool at the bending center along the feeding direction includes: The feeding shaft drives the plate to move at a first speed until there is a first gap between the designated edge and the sensor; The feed shaft pauses when there is a first gap between the designated edge and the sensor; After the feeding shaft pauses, it drives the plate to move at a second speed until the plate triggers at least one pair of sensors at the bending center, where the second speed is less than the first speed.

10. The feeding angle correction method according to claim 7, characterized in that, Also includes: Before the initial alignment, the dimensional parameters of the sheet metal are entered into the control center and the sheet metal is placed on the machine tool surface at the bending center; After the initial alignment, based on the input size parameters of the plate, the control center obtains the coordinate range of the aligned center region in the coordinate system and the distance between the aligned specified edge and the tool. The aligned center region and the aligned specified edge are the center region and the specified edge of the plate at the plate position after the initial alignment, respectively.

11. A bending center, characterized in that, The sheet metal is bent according to the feeding angle correction method as described in any one of claims 1 to 10.

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