CN117772861A - Control method for improving bending precision of plate - Google Patents
Control method for improving bending precision of plate Download PDFInfo
- Publication number
- CN117772861A CN117772861A CN202311701372.2A CN202311701372A CN117772861A CN 117772861 A CN117772861 A CN 117772861A CN 202311701372 A CN202311701372 A CN 202311701372A CN 117772861 A CN117772861 A CN 117772861A
- Authority
- CN
- China
- Prior art keywords
- bending
- plate
- bending angle
- theoretical
- actual
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005452 bending Methods 0.000 title claims abstract description 201
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005259 measurement Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000003466 welding Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention aims to provide a control method for improving bending precision of a plate, which adopts finite element analysis to calculate the theoretical bending angle of the plate according to the mechanical property characteristics of the plate, determines the theoretical bending resilience amount, utilizes a bending machine to develop a process test, verifies the accuracy of a corresponding relation, corrects the theoretical bending angle to control resilience, improves the accuracy of rebound prediction and performs effective rebound compensation. The bending line is marked on the plate at the blanking moment, the horizontal line of the laser level meter is aligned with the central lines of the upper die and the lower die, and in the bending process, the bending line of the plate is aligned with the horizontal line, so that the coincidence degree of the bending line and the central lines of the upper die and the lower die is ensured, and the problem that the bending line is easy to deviate from the die is solved. After bending, checking the bending angle, and after being qualified, installing and welding the angle template to prevent transportation deformation. The invention can effectively improve the bending precision of the plate and solve the problems of low bending precision, easy rebound and deformation of bending, easy deflection of a bending line die and the like of the plate in the prior art.
Description
Technical Field
The invention relates to the field of plate manufacturing and processing, in particular to a control method for improving plate bending precision.
Background
Because the plate material is elastically and plastically deformed in the bending process, the rebound phenomenon is generated after the plate material is unloaded, and the forming quality of a plate material bending piece is seriously affected, which is a great difficulty for a plurality of plate material manufacturing enterprises. The amount of spring back determines the final shape of the bent piece, and when the amount of spring back exceeds the allowable tolerance, forming defects can be generated, and the processing quality and the assembly performance of the product are seriously affected. The rebound rule of the plate has great relation with the material, shape, size and the like, but in practice, the rebound phenomenon of the plate cannot be avoided, and in the bending process, the bending line of the bending piece is manually aligned with the neutral line of the upper die and the lower die of the bending machine, so that offset is easy to cause, the consistency is poor, the bending precision is low, the production requirement cannot be met, however, along with the rapid development of industry, the requirement on the bending precision is also higher and higher, and a control method for improving the bending precision of the plate is urgently needed to be found.
Disclosure of Invention
The invention aims to provide a control method for improving bending precision of a plate, which comprises the following steps:
1) According to the mechanical property characteristics of the plate, calculating the theoretical bending angle of the plate by adopting finite element analysis, and determining the theoretical bending resilience;
2) Based on a theoretical bending angle, bending the plate, measuring the actual bending angle of the plate after bending, and determining the actual bending resilience;
3) Adjusting the mechanical property characteristics of the plate;
4) Repeating the steps 1) to 3), and constructing a functional relation between the actual bending angle and the theoretical bending angle under different material characteristics;
5) Acquiring a required actual bending angle alpha, inputting the required actual bending angle alpha into a functional relation between an actual bending angle corresponding to the characteristics of the plate to be bent and a theoretical bending angle, and calculating to obtain the theoretical bending angle;
6) Based on theoretical bending angle, bending the plate to be bent, and measuring the actual bending angle alpha of the plate after bending ＇ ；
7) Comparing the required actual bending angle alpha with the actual bending angle alpha obtained by measurement after bending ＇ ；
8) Adjusting the required actual bending angle alpha;
9) Repeating the steps 5) to 7) to obtain a plurality of required actual bending angles alpha and actual bending angles alpha measured after bending ＇ And fitting and calculating alpha and alpha ＇ Is a function of (a);
10 Based on alpha and alpha) ＇ By numerical analysis, fitting and correcting theoretical bending angle and actual bending angle alpha ＇ Is a function of (a).
Further, the plate is bent, which comprises the following steps:
1) Placing the sheet between an upper die and a lower die;
2) Scribing a bending line on the plate;
3) And (3) applying load to the plate, and aligning the bending line with the horizontal line of the laser level meter in the bending process to ensure the contact ratio.
Further, before the horizontal line of the laser level meter is aligned with the bending line, the horizontal line of the laser level meter is aligned with the center line of the lower die and the center line of the upper die of the bending machine.
Further, the actual bending angle is measured by an angle gauge.
Further, in step 10), the theoretical bending angle and the actual bending angle α ＇ The step of determining the bending angle of the sheet to be processed comprises the following steps:
10.1 Acquiring a required bending angle and taking the required bending angle as an actual bending angle alpha ＇ Input to the theoretical bending angle and the actual bending angle alpha ＇ Obtaining a theoretical bending angle in the functional relation of (a);
10.2 Based on the theoretical bending angle, bending the board to be processed.
The technical effect of the invention is undoubtedly that the invention has the following beneficial effects:
(1) According to the invention, the theoretical bending angle is calculated according to the characteristics of the shape, the size, the material, the mechanical property and the like of the plate, the corresponding relation between the theoretical bending angle and the actual bending angle is verified by carrying out a process test, the corresponding relation is compensated to control rebound, and the bending precision of the plate is improved from the elastic plastic deformation principle of the plate.
(2) According to the bending piece, the bending line is scored by using the laser cutting equipment during blanking, and the superposition degree of the bending line and the central lines of the upper die and the lower die of the bending machine is improved by using the horizontal line of the laser level meter, so that the bending precision of the plate is improved.
Drawings
FIG. 1 is a perspective view of a part bent;
fig. 2 is a schematic diagram of laser modeling.
In the figure: 1-upper die; 2-lower die; 3-bending piece; 4-bending lines; 5-horizontal line; 6-a center line of the lower die; 7-upper die center line.
Detailed Description
The present invention is further described below with reference to examples, but it should not be construed that the scope of the above subject matter of the present invention is limited to the following examples. Various substitutions and alterations are made according to the ordinary skill and familiar means of the art without departing from the technical spirit of the invention, and all such substitutions and alterations are intended to be included in the scope of the invention.
Example 1:
a control method for improving bending precision of a plate comprises the following steps:
1) According to the mechanical property characteristics of the plate 3, calculating the theoretical bending angle of the plate 3 by adopting finite element analysis, and determining the theoretical bending resilience;
2) Based on a theoretical bending angle, bending the plate 3, measuring the actual bending angle of the plate 3 after bending, and determining the actual bending resilience;
3) Adjusting the mechanical property characteristics of the plate 3;
4) Repeating the steps 1) to 3), and constructing a functional relation between the actual bending angle and the theoretical bending angle under different material characteristics;
5) Acquiring a required actual bending angle alpha, inputting the required actual bending angle alpha into a functional relation between an actual bending angle corresponding to the characteristics of the plate to be bent and a theoretical bending angle, and calculating to obtain the theoretical bending angle;
6) Based on theoretical bending angle, bending the plate to be bent, and measuring the actual bending angle alpha of the plate after bending ＇ ；
7) Comparing the required actual bending angle alpha with the actual bending angle alpha obtained by measurement after bending ＇ ；
8) Adjusting the required actual bending angle alpha;
9) Repeating the steps 5) to 7) to obtain a plurality of required actual bending angles alpha and actual bending angles alpha measured after bending ＇ And fitting and calculating alpha and alpha ＇ Is a function of (a);
10 Based on alpha and alpha) ＇ By numerical analysis, fitting and correcting theoretical bending angle and actual bending angle alpha ＇ Is a function of (a).
Example 2:
the main structure of this embodiment is the same as that of embodiment 1, and further, the plate 3 is bent, including the following steps:
1) Placing the plate 3 between an upper die 1 and a lower die 2;
2) Scribing a bending line 4 on the plate 3;
3) And (3) applying load to the plate (3), and aligning the bending line (4) to the horizontal line (5) of the laser level instrument in the bending process to ensure the contact ratio.
Example 3:
the main structure of this embodiment is the same as any one of embodiments 2, and further, before the horizontal line 5 of the laser level is aligned with the bending line 4, the horizontal line is aligned with the lower die center line 6 and the upper die center line 7 of the bending machine.
Example 4:
the main structure of this embodiment is the same as any one of embodiments 1 to 3, and further, the actual bending angle is measured by an angle gauge.
Example 5:
the main structure of this embodiment is the same as any one of embodiments 1 to 4, and further, in step 10), the theoretical bending angle and the actual bending angle α ＇ The step of determining the bending angle of the sheet to be processed comprises the following steps:
10.1 Acquiring a required bending angle and taking the required bending angle as an actual bending angle alpha ＇ Input to the theoretical bending angle and the actual bending angle alpha ＇ Obtaining a theoretical bending angle in the functional relation of (a);
10.2 Based on the theoretical bending angle, bending the board to be processed.
Example 6:
the main structure of this embodiment is the same as any one of embodiments 1 to 5, and further, according to the mechanical property characteristics of the sheet material 3, the theoretical bending angle of the sheet material 3 is calculated based on finite element analysis, the theoretical bending resilience amount is determined, a process test is performed by using a bending machine to verify the accuracy of the corresponding relation, the bending angle is checked, the theoretical bending angle is compensated to control resilience, the corresponding relation between the corrected theory and the actual bending angle ensures that the actual required bending angle just reaches after bending resilience, and the method for improving the accuracy of resilience prediction and performing effective resilience compensation is one of the most practical and effective ways for solving the problem of easy rebound deformation of sheet material bending.
And when the plate 3 is fed, the bending line 4 is scored by using laser cutting equipment, in the bending process, the blue light horizontal line 5 of the laser level meter is aligned with the central lines of the upper and lower dies of the bending machine, and then the bending line 4 of the plate is aligned with the blue light horizontal line 5, so that the coincidence ratio of the bending line 4 and the central lines of the upper and lower dies of the bending machine is ensured, and the problem that the bending line is easy to deviate in die alignment is solved.
After bending, the bending angle is measured by using an angle ruler, the precision is checked, and after the bending is qualified, the angle template is welded again to prevent transportation deformation, so that the problems of low bending precision, easiness in rebound deformation during bending, easiness in deflection of a bending line pair mould and the like of the plate are effectively solved.
Claims (5)
1. The control method for improving the bending precision of the plate is characterized by comprising the following steps of:
1) According to the mechanical property characteristics of the plate (3), calculating the theoretical bending angle of the plate (3) by adopting finite element analysis, and determining the theoretical bending resilience;
2) Based on a theoretical bending angle, bending the plate (3), measuring the actual bending angle of the plate (3) after bending, and determining the actual bending resilience;
3) Adjusting the mechanical properties of the sheet material (3);
4) Repeating the steps 1) to 3), and constructing a functional relation between the actual bending angle and the theoretical bending angle under different material characteristics;
5) Acquiring a required actual bending angle alpha, inputting the required actual bending angle alpha into a functional relation between an actual bending angle corresponding to the characteristics of the plate to be bent and a theoretical bending angle, and calculating to obtain the theoretical bending angle;
6) Bending a plate to be bent based on a theoretical bending angle, and measuring an actual bending angle alpha' of the plate after bending;
7) Comparing the required actual bending angle alpha with an actual bending angle alpha' obtained by measurement after bending;
8) Adjusting the required actual bending angle alpha;
9) Repeating the steps 5) to 7), obtaining a plurality of required actual bending angles alpha and actual bending angles alpha 'obtained by measuring after bending, and fitting and calculating the functional relation of alpha and alpha';
10 Based on the functional relation between alpha and alpha ', the functional relation between the theoretical bending angle and the actual bending angle alpha' is corrected by numerical analysis fitting.
2. The control method for improving bending precision of the plate according to claim 1, wherein the control method comprises the following steps: bending the plate (3) comprises the following steps:
1) Placing the plate (3) between an upper die (1) and a lower die (2);
2) -scoring (4) the sheet (3) by a bending line;
3) And (3) applying load to the plate (3), and aligning the bending line (4) to a horizontal line (5) of the laser level meter in the bending process to ensure the coincidence degree.
3. The control method for improving bending precision of the plate according to claim 2, wherein the control method comprises the following steps: before the horizontal line (5) of the laser level meter is aligned with the bending line (4), the horizontal line is aligned with the center line (6) of the lower die and the center line of the upper die (7) of the bending machine.
4. The control method for improving bending precision of the plate according to claim 1, wherein the control method comprises the following steps: the actual bending angle is measured by an angle ruler.
5. The control method for improving bending precision of the plate according to claim 1, wherein the control method comprises the following steps: in step 10), the functional relation between the theoretical bending angle and the actual bending angle α' is used to determine the bending angle of the sheet to be processed, and the steps include:
10.1 Acquiring a required bending angle, and inputting the required bending angle as an actual bending angle alpha 'into a functional relation between a theoretical bending angle and the actual bending angle alpha', so as to obtain the theoretical bending angle;
10.2 Based on the theoretical bending angle, bending the board to be processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311701372.2A CN117772861A (en) | 2023-12-12 | 2023-12-12 | Control method for improving bending precision of plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311701372.2A CN117772861A (en) | 2023-12-12 | 2023-12-12 | Control method for improving bending precision of plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117772861A true CN117772861A (en) | 2024-03-29 |
Family
ID=90393674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311701372.2A Pending CN117772861A (en) | 2023-12-12 | 2023-12-12 | Control method for improving bending precision of plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117772861A (en) |
-
2023
- 2023-12-12 CN CN202311701372.2A patent/CN117772861A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108801772B (en) | Strain gauge positioning method for high-speed tensile load test | |
| CN109073351B (en) | Flatness measuring method and pin height adjusting method | |
| CN110814086B (en) | Method for measuring springback value of sheet after stamping | |
| CN116933414A (en) | High-frequency welded pipe molding simulation calculation method | |
| CN117772861A (en) | Control method for improving bending precision of plate | |
| CN100377802C (en) | Device and method for calibrating a planishing roller device by means of an instrumented bar | |
| CN105675406A (en) | High-temperature bending detection method of metal material | |
| CN107860654A (en) | A kind of method and system that cylinder pressure-bearing section offset is determined based on axial compressive force | |
| CN108161364B (en) | Processing technology of hyperbolic crankle component | |
| JP7096962B2 (en) | Optimal method for measuring residual stress | |
| JP6044606B2 (en) | Expected mold shape creation method and apparatus | |
| CN108544190B (en) | Manufacturing method of bent box-shaped steel tower segment | |
| CN104121882A (en) | Steel pipe welding gap angular distortion detection method and device | |
| CN211361610U (en) | Tool setting tool | |
| CN100545396C (en) | Technique for preparing large cross section thin plate limosis steel pole | |
| KR20130051726A (en) | System for judging defect of warpage in light guide plate and method for judging defect of warpage in light guide plate using the same | |
| KR100782782B1 (en) | Work sheet flattening method using press reforming apparatus and surface shape measuring device | |
| CN212482367U (en) | Double-clamping sample plate for integral spherical curved surface curvature inspection | |
| CN110285764A (en) | A kind of measurement method and display panel of display panel cutting accuracy | |
| CN115070488B (en) | Part posture adjustment method | |
| CN112845672B (en) | Automatic leveling method for metal plate | |
| CN115971378B (en) | Special-shaped spring production control method and system based on visual detection | |
| CN102269677A (en) | Treatment method for abnormal value of plastic strain ratio r value | |
| CN203900166U (en) | Inspection tool for product punched from complex-curved surface metal plate | |
| CN102980540A (en) | Quick positioned detecting method for thickness size of variable thickness part and auxiliary detecting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication |