Numerical control bending machine precision debugging method

Abstract

The present application relates to the technical fields of bending machine precision debugging, especially to a numerical control bending machine precision debugging method, comprising the following specific steps: S1, adjusting two groups of sliders to the highest limit position, staying still, and inspecting and adjusting the workbench and the two groups of sliders; S2, setting and controlling the numerical value of the bending machine system; S3, switching the screen, entering the inching debugging picture, selecting X axis, Y axis and Z axis respectively, performing inching operation, observing whether the X axis motor, Y axis motor and Z axis power cylinder can normally run, and observing whether the system display changes normally and the motor running direction is correct; S4, controlling the two groups of sliders to slide symmetrically, recording the sliding track, and automatically generating a curve graph for backup; Compared with the existing numerical control bending machine precision debugging method, the present application can conveniently and automatically debug the numerical control bending machine accurately, and improves the convenience and accuracy of the existing numerical control bending machine precision debugging method.

Description

Technical Field

[0001] This invention relates to the field of precision adjustment technology for bending machines, specifically a method for precision adjustment of CNC bending machines. Background Technology

[0002] Bending machines are a type of forging and pressing machinery, primarily used in the metal processing industry. They are widely applicable in light industry, aerospace, shipbuilding, metallurgy, instrumentation, electrical appliances, stainless steel products, steel structure construction, and decoration. Bending machines are currently the preferred machinery for sheet metal processing, especially large sheet metal. By selecting various dies, they can perform bending, stretching, rounding, punching, and other operations on sheet metal. Bending machines can be divided into mechanical and hydraulic types. For high-end CNC hydraulic bending machines currently on the market, the DELEM system is used. By reasonably adjusting the system parameters, the machine tool's movements can be optimized to maximize its high precision and stability.

[0003] A search revealed application number 201510998674.X, which discloses a method for precision debugging of a CNC bending machine, belonging to the field of bending machine debugging. This method involves the following steps: 1. Turning on the bending machine control system and inputting the required operating parameters; 2. Uniformly reducing the proportional gain value in the PI controller and observing the actual operating curve until the slider's running curve is stable during the bending stage and the slider does not vibrate, thus determining the optimal proportional gain value; 3. Uniformly reducing the integral gain value and observing the actual operating curve until the slider's running curve is stable during the bending stage and the slider's trajectory does not overshoot, thus determining the optimal proportional gain value; 4. Obtaining the required integral gain value and proportional gain value. This method ensures the slider remains stable and does not overshoot during operation, guaranteeing high precision during bending, improving production efficiency, and reducing production costs.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: In the above-mentioned application, during the precise debugging operation of the CNC bending machine, it is necessary to manually set and debug the parameters required for the operation of the bending machine. The optimal value of the proportional gain value is determined by appropriately adjusting the proportional gain value and the low integral gain value in the PI controller and observing the actual operating curve. Moreover, the debugging operation is not only cumbersome during multiple debugging sessions, requiring manual operation and wasting time, but also prone to errors due to manual observation of data, affecting the accuracy of the debugging.

[0005] Therefore, in order to improve the existing CNC bending machine precision debugging method, a new CNC bending machine precision debugging method is designed to change the above-mentioned technical defects and improve the overall practicality of the CNC bending machine precision debugging method. Summary of the Invention

[0006] The purpose of this invention is to provide a method for adjusting the accuracy of a CNC bending machine, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A method for adjusting the accuracy of a CNC bending machine includes the following specific steps:

[0009] S1. Adjust both sets of sliders to their maximum positions and hold them still. Inspect and adjust the worktable and the two sets of sliders.

[0010] S2. Set and control the numerical values ​​of the bending machine system;

[0011] S3. Switch the screen to enter the jog debugging screen. Select the X-axis, Y-axis and Z-axis respectively, and perform jog operation. Observe whether the X-axis and Y-axis motors and Z-axis power cylinder can operate normally. At the same time, observe whether the system display changes normally and whether the motor running direction is correct.

[0012] S4. Control the two sets of sliders to slide symmetrically along the path, and record the sliding trajectory. The recorded trajectory will be automatically generated into a curve for backup.

[0013] S5. By comparing the sliding trajectory curve of the backed-up slider with the curve stored in the bending machine system, a comparison diagram of the sliding trajectory curves of the two sliders is obtained, and the comparison result is then converted into detection data.

[0014] S6. Then, based on the comparison results, make appropriate adjustments to the two sets of sliders, and observe the changes in the sliding trajectory curves of the two sets of sliders during the debugging phase. When the two sets of curves completely match the internal curves of the bending machine system, stop the debugging operation.

[0015] As a preferred embodiment of the present invention, the workbench inspection method in S1 mainly includes: longitudinal parallelism inspection and transverse parallelism inspection.

[0016] As a preferred embodiment of the present invention, in step S1, the workbench adjustment method is as follows: the workbench is adjusted in height according to the detection value so that the workbench is in a horizontal position.

[0017] As a preferred embodiment of the present invention, in step S1, the longitudinal parallelism is checked by placing a dial indicator on the workbench, with the magnetic base of the dial indicator adsorbed on the workbench, and the dial indicator head contacting the bottom surface of the upper mold to obtain the test value.

[0018] As a preferred embodiment of the present invention, in step S1, the transverse parallelism is inspected by placing a dial indicator on the workbench, with the magnetic base of the dial indicator adsorbed on the workbench, the dial indicator head contacting the bottom surface of the upper mold, moving back and forth to obtain the test value.

[0019] As a preferred embodiment of the present invention, in step S1, the perpendicularity of the two sets of sliders to the tool holder is detected by adjusting the two sets of sliders to fit close to each other.

[0020] As a preferred embodiment of the present invention, in step S2, the numerical settings of the bending machine system include slider running time, slider running acceleration, slider running deceleration, moving distance, and moving range.

[0021] As a preferred embodiment of the present invention, in step S3, the motor is adjusted by multi-point control, with the distance between two adjacent points being 20cm-40cm, so that the adjusted motor stops at any position, and the actual position is measured by a grating ruler to see if it matches the system display.

[0022] As a preferred embodiment of the present invention, in step S6, when the detection data shows that there is a lateral levelness error between the two sets of sliders, the controller promptly instructs the power cylinder on one side to make a slight height adjustment.

[0023] As a preferred embodiment of the present invention, in step S6, when the detection data shows that there is a longitudinal levelness error between the two sets of sliders, the controller promptly instructs one of the motors to make a slight adjustment forward and backward.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] In this invention, before the bending machine runs, the parallelism of the slider and the worktable is checked to ensure their standardization and prevent them from affecting the machining accuracy of the CNC bending machine. Secondly, by comparing the backed-up slider sliding trajectory curve with the curve stored in the bending machine system, a comparison diagram of the two slider sliding trajectory curves is obtained. The comparison result is then converted into detection data and automatically uploaded to the self-control system. The controller promptly instructs one of the power cylinders to make minor adjustments, which can automatically adjust the precision of the bending machine. The operation is simple and convenient, requiring no manual adjustment, thus improving the machining accuracy of the bending machine after adjustment. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the relationship between flatness error and bending angle error in this practical application. Figure 1 ;

[0027] Figure 2 This is a schematic diagram illustrating the relationship between flatness error and bending angle error in this practical application. Figure 2 . Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] To facilitate understanding of the present invention, a more comprehensive description of the invention will be provided below with reference to relevant embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be more thorough and complete.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] Example:

[0033] Please see Figure 1 and Figure 2 The present invention provides a technical solution:

[0034] A method for adjusting the accuracy of a CNC bending machine includes the following specific steps:

[0035] Step 1: Adjust both sets of sliders to their highest limit positions and hold them still. Inspect and adjust the worktable and the two sets of sliders.

[0036] In step one, the workbench inspection methods mainly include: longitudinal parallelism inspection and transverse parallelism inspection;

[0037] Among them, longitudinal parallelism test: a dial indicator is placed on the workbench, the magnetic base of the dial indicator is attached to the workbench, the dial indicator head contacts the bottom surface of the upper mold, and the test value is obtained.

[0038] The depth to which the upper die cutter enters the lower die slot is related to the longitudinal flatness error of the worktable. The depth deviation AH and the flatness error a are equal in magnitude. A schematic diagram illustrating the influence of the longitudinal flatness of the worktable on the bending angle error is attached (see attached diagram). Figure 1 )

[0039] △H is the depth deviation of the tool entering the groove: △H = a

[0040] The bending angle is:

[0041] ;

[0042] The angular deviation is: .

[0043] Secondly, the magnitude of the longitudinal flatness error of the worktable is equal to the straightness error of the bent workpiece, i.e., Δl = a (see attached figure). Figure 2 )

[0044] Further, lateral parallelism inspection: Place a dial indicator on the workbench, with the magnetic base of the dial indicator adsorbed on the workbench, and the dial indicator head contacting the bottom surface of the upper mold. Move it back and forth to obtain the test value. Adjust the height of the workbench according to the test value to make the workbench level.

[0045] The depth to which the upper die cutter enters the lower die slot is related to the lateral flatness error of the worktable. The depth deviation ΔH and the flatness error b are equal in magnitude. The influence of the lateral flatness of the worktable on the bending angle error is shown in the attached figure. Figure 1 );

[0046] The depth deviation ΔH is: ΔH = b;

[0047] The bending angle is: ;

[0048] ;

[0049] The angular deviation is: .

[0050] Secondly, the influence of the lateral flatness error of the worktable and the straightness error b of the bent workpiece are equal in magnitude, that is: △l=b (see attached figure). Figure 2 )

[0051] Among them, since the influence of slider flatness on workpiece bending accuracy is similar to that of worktable flatness, the influence of slider longitudinal flatness c on workpiece bending accuracy is significant.

[0052] Angular deviation is ;

[0053] Straightness error of bent workpiece: Δl = c;

[0054] The influence of the slider's lateral flatness d on the workpiece's bending accuracy;

[0055] Degree deviation is ;

[0056] Straightness error of bent workpiece: △l=d.

[0057] Furthermore, by adjusting the two sets of sliders to fit closely with the tool holder, the perpendicularity of the two sets of sliders to the tool holder is detected;

[0058] In addition, before the bending machine is run, the parallelism of the slider and the worktable is checked to ensure their standardization and prevent them from affecting the accuracy of CNC bending machine processing.

[0059] Step 2: Set and control the numerical values ​​of the bending machine system;

[0060] In step two, the numerical settings for the bending machine system include slide running time, slide running acceleration, slide running deceleration, moving distance, and moving range.

[0061] The numerical settings consist of two sets of data for slider A and slider B. The numerical settings for slider A and slider B include slider running time, slider running acceleration, slider running deceleration, moving distance, and moving range.

[0062] Furthermore, by setting individual values ​​for sliders A and B, the controller can easily adjust sliders A and B independently.

[0063] Step 3: Switch the screen to enter the jog debugging screen. Select the X-axis, Y-axis and Z-axis respectively, and perform jog operation. Observe whether the X-axis and Y-axis motors and Z-axis power cylinder can operate normally. At the same time, observe whether the system display changes normally and whether the motor running direction is correct.

[0064] In addition, in step three, the motor is adjusted by multi-point control, with the distance between two adjacent points being 20cm-40cm, so that the adjusted motor stops at any position. The actual position is measured by a grating ruler to see if it matches the system display.

[0065] Step 4: Control the two sets of sliders to slide symmetrically along the path, and record the sliding trajectory. The recorded trajectory will be automatically generated into a curve for backup. The system will then automatically save the backed-up curve.

[0066] Step 5: By comparing the sliding trajectory curve of the backed-up slider with the curve stored in the bending machine system, a comparison chart of the sliding trajectory curves of the two sliders is obtained, and the comparison results are then converted into detection data.

[0067] Step 6: Then, based on the comparison results, make appropriate adjustments to the two sets of sliders, and at the same time observe the changes in the sliding trajectory curves of the two sets of sliders during the debugging phase. When the two sets of curves completely match the internal curves of the bending machine system, stop the debugging operation.

[0068] In step six, when the detection data shows a lateral levelness error between the two sets of sliders, the controller promptly instructs the power cylinder on one side to make a slight height adjustment; and when the detection data shows a longitudinal levelness error between the two sets of sliders, the controller promptly instructs the motor on one side to make a slight forward and backward adjustment.

[0069] The workflow of this invention is as follows: When the user performs precision adjustment on the CNC bending machine, firstly, adjust both sets of sliders to their highest limit positions and hold them still to inspect and adjust the worktable and the two sets of sliders; then, set and control the bending machine system; next, switch the screen to enter the jog debugging screen, select the X-axis, Y-axis, and Z-axis respectively, perform jog operations, and observe the X-axis and Y-axis... The system monitors whether the Z-axis motor and Z-axis power cylinder are operating normally, and observes whether the system display changes normally and whether the motor's running direction is correct. The process involves manipulating two sets of sliders to slide symmetrically along a path, recording the sliding trajectory, and automatically generating a curve for backup. Next, the backed-up slider trajectory curve is compared with the curve stored internally in the bending machine system to obtain a comparison curve of the two sets of sliders. The comparison result is then converted into detection data. Based on the comparison results, appropriate adjustments are made to the two sets of sliders. When the detection data shows a lateral levelness error between the two sets of sliders, the controller promptly instructs one side's power cylinder to make a slight height adjustment. Similarly, when the detection data shows a longitudinal levelness error between the two sets of sliders, the controller promptly instructs one side's motor to make a slight forward and backward adjustment. The changes in the slider trajectory curves during the debugging phase are observed. When both curves perfectly match the curves internally in the bending machine system, the debugging operation is stopped. The entire operation process is simple and convenient. Compared with existing CNC bending machine precision debugging methods, this invention improves the convenience and accuracy of existing CNC bending machine precision debugging methods through design.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision adjustment method for a numerical control bending machine, characterized by, Comprise the following specific steps: S1, adjust two groups of sliders to the highest limit position, stay still, inspect and adjust the workbench and two groups of sliders; S2, set numerical values for the bending machine system and control it; S3, switch the screen, enter the jog debugging screen, select X axis, Y axis and Z axis respectively, perform jog operation, observe whether the X axis motor, Y axis motor and Z axis cylinder can operate normally, and whether the system display changes normally and the motor operating direction is correct; S4, control two groups of sliders to slide symmetrically, record the sliding track, and automatically generate a curve graph for backup; S5, compare the sliding track curve graph of the backup slider with the curve graph stored in the bending machine system, obtain a sliding track curve comparison graph of the two groups of sliders, and then convert the comparison result into detection data; S6, then adjust the two groups of sliders according to the comparison result, and observe the change of the sliding track curve graph of the two groups of sliders during the debugging stage, and stop the debugging operation when the two groups of curve graphs completely match the internal curve graph of the bending machine system; In the S1, the workbench inspection method mainly includes longitudinal parallelism inspection and transverse parallelism inspection; In the S1, the workbench adjustment method is to adjust the height of the workbench according to the detection value, so that the workbench is in a horizontal state; In the S1, the longitudinal parallelism inspection is to place a dial indicator on the workbench, with the magnetic base of the dial indicator adsorbed on the workbench, and the dial indicator head contacting the bottom surface of the upper die, to obtain the detection value; In the S1, the transverse parallelism inspection is to place a dial indicator on the workbench, with the magnetic base of the dial indicator adsorbed on the workbench, and the dial indicator head contacting the bottom surface of the upper die, to obtain the detection value; In the S1, the perpendicularity of the two groups of sliders and the tool holder is detected by adjusting the two groups of sliders to be close to the tool holder; In the S6, when the detection data shows that there is a transverse level error between the two groups of sliders, the controller timely instructs one side of the cylinder to make a slight height adjustment; In the S6, when the detection data shows that there is a longitudinal level error between the two groups of sliders, the controller timely instructs one side of the motor to make a slight forward and backward adjustment.

2. The numerical control bending machine precision debugging method according to claim 1, characterized in that: In the S2, the numerical value setting of the bending machine system includes slider running time, slider running acceleration, slider running deceleration, moving distance and moving range interval.

3. The numerical control bending machine precision debugging method according to claim 1, characterized in that: In the S3, the motor is adjusted by multi-point control, and the distance between adjacent two points is 20-40 cm, so that the adjusted motor can stop at any position, and the actual position measured by the grating ruler is consistent with the system display.

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