CN112718942B - Bending angle correction method for bending machine - Google Patents
Bending angle correction method for bending machine Download PDFInfo
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- CN112718942B CN112718942B CN202011439264.9A CN202011439264A CN112718942B CN 112718942 B CN112718942 B CN 112718942B CN 202011439264 A CN202011439264 A CN 202011439264A CN 112718942 B CN112718942 B CN 112718942B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/004—Bending sheet metal along straight lines, e.g. to form simple curves with program control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/006—Bending sheet metal along straight lines, e.g. to form simple curves combined with measuring of bends
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The invention discloses a bending angle correction method for a bending machine, which comprises the following steps: 1. the angle correction system sends a pre-bending angle signal to the control system; 2. the bending machine pre-bends the plate and calculates compensation travel data; 3. the bending machine performs compensation bending on the plate; 3.1, the bending machine executes bending action, and the angle correction system measures the actual bending angle; 3.2, the angle correction system feeds back the actual bending angle to the control system, and the control system compares the actual bending angle with the target bending angle; 3.3, the control system controls the bending machine to release the plate after compensation bending, the angle correction system detects and calculates compensation stroke data of the plate, and the compensation stroke data is fed back to the control system, and the step 3.1 is returned; 4. and the control system controls the return stroke of the bending machine, and the correction of the bending angle is finished. The invention can reach the bending target angle through pre-bending and one-time compensation correction, has high bending precision, does not need manual intervention in the bending process, and improves the efficiency and quality of the bending process.
Description
Technical Field
The invention relates to a control method of a bending machine, in particular to a bending angle correction method for the bending machine.
Background
The bending machine is a machine capable of bending metal plates, and structurally mainly comprises a support, a workbench, a clamping plate, an upper bending die, a lower bending die and the like. Because the panel beating has certain resilience characteristic, probably appear the resilience and lead to bending angle disqualification after bending the release, in order to ensure the machining precision of bender, the bender of prior art carries out secondary or many times bending to the panel beating through the mode of angle compensation.
The angle compensation device in the prior art comprises a hydraulic compensation device or a mechanical compensation device, and the working principle is as follows: setting a bending target angle, taking down the plate after bending, manually measuring the bending actual angle, if the bending actual angle is 1.5 degrees larger than the bending target angle, presetting a compensation value of 1.5 degrees before the bending machine performs secondary bending, taking down the plate after bending according to the preset compensation value, manually measuring the bending actual angle, if the bending actual angle is 0.5 degrees larger than the bending target angle, presetting a compensation value of 1.5 degrees plus 0.5 degrees before the bending machine performs tertiary bending, and so on until the bending angle meets the plate processing requirement; the subsequent bending of the plate can adopt a preset compensation value which finally meets the processing requirement of the plate. In the actual bending process, the bending machine cannot reach the preset bending angle at one time, manual measurement is needed before each bending, the compensation value is modified, and corresponding bending action is performed. Meanwhile, in the long-term production process of the bending machine, the performance of the bending machine is continuously reduced, the bending angle is also subjected to larger and larger deviation, and the accuracy of the bending angle of the plate can be ensured by manually measuring and modifying the compensation value.
Chinese patent application CN201910439425.5 discloses a precision bending machine mechanical compensation workbench with integral waveform sloping block structure, and specifically discloses: the workbench comprises a base and a cover plate, wherein a first square groove and a second square groove are formed in the cover plate; an upper inclined block and a lower inclined block which are of wave structures and are matched through a plurality of bidirectional inclined planes are arranged in the second square groove; the upper oblique block units are sequentially arranged and are in clearance fit, the upper surface of each upper oblique block unit is horizontal, and the lower surface of each upper oblique block unit is provided with a bidirectional inclined plane; the lower inclined block is of an integral structure, the lower surface of the lower inclined block is horizontal, and the upper surface of the lower inclined block is provided with a plurality of bidirectional inclined planes which are in one-to-one correspondence with the bidirectional inclined planes of the upper inclined block units. The workbench is required to realize high precision and compensation function through one-to-one correspondence of the upper inclined plane and the lower inclined plane, the compensation operation is inconvenient, the compensation amount is determined by the inclined plane length of the upper wedge block and the lower wedge block, the compensation precision angle is poor in controllability.
Disclosure of Invention
The invention aims to provide a bending angle correction method for a bending machine, which can achieve a bending target angle through pre-bending and one-time compensation correction, has high bending precision, does not need manual intervention in the bending process, and improves the efficiency and quality of a bending process.
The invention is realized in the following way:
a bending angle correction method for a bending machine comprises the following steps:
step 1: the angle correction system of the bending machine sends a pre-bending angle signal to the control system;
step 2: the control system controls the bending machine to pre-bend the plate and calculates compensation stroke data;
step 3: the control system controls the bending machine to execute compensation bending on the plate;
the specific steps of the compensating bending of the plate are as follows:
step 3.1: the control system controls the bending machine to execute bending action according to the compensation stroke data, releases the compensated plate after bending, and detects the actual bending angle of the plate through the angle correction system, namely the rebound angle of the plate after being released again;
step 3.2: the angle correction system feeds back the detected bending actual angle to the control system, and the control system compares the bending actual angle with the bending target angle:
I. if the actual bending angle is smaller than the bending target angle, executing the step 3.3;
II. If the actual bending angle is equal to the bending target angle, finishing the plate bending process, and turning to the step 4;
III, if the actual bending angle is smaller than the bending target angle, an abnormal angle alarm is sent out, and the step 4 is carried out;
step 3.3: the angle correction system detects and calculates compensation travel data of the plate, and feeds back the compensation travel data to the control system, and the step 3.1 is returned;
step 4: and the control system controls the return stroke of the bending machine, and the correction of the bending angle is finished.
In the step 1, the pre-bending angle signal includes a pre-bending set angle, and the pre-bending angle set value is larger than the bending target angle.
The preset bending set angle is 2-5 degrees larger than the bending target angle.
In the step 2, the specific steps of pre-bending the plate are as follows:
step 2.1: the control system controls the bending machine to execute a pre-bending action on the plate according to the pre-bending angle signal and the bending target angle, releases the pre-bent plate, and detects the pre-bending actual angle of the plate through the angle correction system, namely the rebound angle of the plate after being released;
step 2.2: the angle correction system feeds back the detected actual angle of the pre-bending to the control system, and the control system compares the actual angle of the pre-bending with the bending target angle:
I. if the actual angle of the pre-bending is larger than the bending target angle, executing the step 2.3;
II. If the actual angle of the pre-bending is equal to the bending target angle, the plate bending process is completed, and the step 4 is carried out;
III, if the actual angle of the pre-bending is smaller than the bending target angle, an abnormal angle alarm is sent out, and the step 4 is carried out;
step 2.3: the angle correction system detects and calculates compensation travel data of the plate and feeds the compensation travel data back to the control system.
The detection and calculation method of the compensation travel data of the plate comprises the following steps:
step S1: the angle correction system detects the angle before rebound before the release of the plate and the angle after rebound after the complete release of the plate;
step S2: the angle correction system calculates the rebound angle according to the angle before rebound and the angle after rebound, and the calculation formula is as follows: rebound angle = rebound post angle-rebound pre angle;
step S3: and calculating compensation travel data of the upper beam of the bending machine in the next bending process according to the rebound angle.
In the step 2.2, when the actual angle of the pre-bending is compared with the bending target angle, the bending angle allowance value is set through the control system, and when the angle between the actual angle of the pre-bending and the bending target angle is less than or equal to the bending angle allowance value, the control system judges that the actual angle of the pre-bending is equal to the bending target angle.
In the step 3.2, when the bending actual angle and the bending target angle are compared, a bending angle allowance value is set through the control system, and when the bending actual angle is equal to or less than the bending target angle allowance value, the control system judges that the bending actual angle is equal to the bending target angle.
The angle of the bending allows a value of 0.3 degrees.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the real-time detection of the bending angle after each bending action is realized through the angle correction system, the accurate compensation of the next bending action is realized according to the rebound angles before and after the bending machine releases the plate, the degree of automation is high, manual intervention is not needed in the bending process, and the efficiency and quality of the bending procedure are improved on the basis of ensuring the precision of the bending angle.
2. According to the invention, the actual angle of the plate bending is detected through the angle correction system, the bending process can be reflected more accurately and actually, the compensation value is not required to be modified manually for many times, the accuracy of the next bending is ensured through automatic calculation of the compensation stroke data, each compensation bending is more accurate, and the rejection rate of the plate is reduced.
Drawings
Fig. 1 is a flow chart of a bending angle correction method for a bending machine of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
Referring to fig. 1, a bending angle correction method for a bending machine includes the following steps:
step 1: the angle correction system of the bending machine sends a pre-bending angle signal to the control system. The angle correction system is arranged on the lower beam of the bending machine, so that the bending angle parameters of the plate can be collected in real time.
The pre-bending angle signal comprises a pre-bending set angle, and the pre-bending angle set value is larger than the bending target angle.
The preset bending angle is 2-5 degrees, preferably 3 degrees larger than the bending target angle, and can be determined according to different bending machine performances and processing requirements.
Step 2: and the control system controls the bending machine to pre-bend the plate and calculates compensation stroke data.
The specific steps of the pre-bending plate are as follows:
step 2.1: the control system controls the bending machine to execute a pre-bending action on the plate according to the pre-bending angle signal and the bending target angle, releases the pre-bent plate, and detects the pre-bending actual angle of the plate through the angle correction system, namely the rebound angle of the plate after being released.
Step 2.2: the angle correction system feeds back the detected actual angle of the pre-bending to the control system, and the control system compares the actual angle of the pre-bending with the bending target angle:
I. and if the actual angle of the pre-bending is larger than the bending target angle, executing the step 2.3.
II. If the actual angle of the pre-bending is equal to the bending target angle, the plate bending process is completed, and the step 4 is performed.
And III, if the actual angle of the pre-bending is smaller than the bending target angle, an abnormal angle alarm is sent out, and the step 4 is carried out.
Step 2.3: the angle correction system detects and calculates compensation travel data of the plate and feeds the compensation travel data back to the control system.
When the actual angle of the pre-bending is compared with the bending target angle, a bending angle allowance value is set through the control system, and when the actual angle of the pre-bending is equal to or less than the bending target angle allowance value, the control system judges that the actual angle of the pre-bending is equal to the bending target angle. Due to the influence of factors such as mechanical structure, plate characteristics and the like, a few tiny errors exist in the bending angle inevitably, and certain bending errors can be allowed through the arrangement of the bending angle allowance value, so that excessive bending or repeated working procedures are avoided.
Step 3: the control system controls the bending machine to execute compensation bending on the plate.
The specific steps of the compensating bending of the plate are as follows:
step 3.1: and the control system controls the bending machine to execute bending action according to the compensation stroke data, releases the plate after compensation bending, and detects the actual bending angle of the plate through the angle correction system, namely the rebound angle of the plate after the plate is released again. The angle correction system can be provided with a laser angle detection device, laser is projected on the plate to rapidly detect the actual value of the bending angle of the plate, and the detection accuracy, the real-time performance and the stability are high.
Step 3.2: the angle correction system feeds back the detected bending actual angle to the control system, and the control system compares the bending actual angle with the bending target angle:
I. and if the actual bending angle is smaller than the bending target angle, executing the step 3.3.
II. If the actual bending angle is equal to the bending target angle, the plate bending process is completed, and the step 4 is performed.
And III, if the actual bending angle is smaller than the bending target angle, an abnormal angle alarm is sent out, and the step 4 is carried out.
Similarly, when the bending actual angle and the bending target angle are compared, the control system determines that the bending actual angle is equal to the bending target angle when the bending actual angle is equal to or less than the bending target angle.
The bending angle allowance value is 0.2-0.5 degrees, namely the error between the final bending angle of the plate and the bending target angle is +/-0.2- +/-0.5 degrees, and the bending angle allowance value can be determined according to the processing requirement of a customer, and is preferably 0.3 degrees.
Step 3.3: the control system controls the bending machine, the angle correction system detects and calculates compensation travel data of the plate, the compensation travel data are fed back to the control system, and the step 3.1 is returned.
The detection and calculation method of the compensation travel data of the plate comprises the following steps:
step S1: the angle correction system detects the pre-rebound angle of the sheet before release and the post-rebound angle of the sheet after full release. The angle correction system can detect the bending angle of the plate in real time or periodically in the release process of the plate, compares the currently detected bending angle value with the last bending angle value, reserves a larger bending angle value, and takes the detected bending angle maximum value as the angle after rebound.
The angle correction system detects bending angles of plates by adopting a laser emitter, a high-definition camera and the like in the prior art, a pair of laser emitters and the high-definition camera are symmetrically arranged on two sides of a lower beam of a bending machine, the laser emitters respectively emit laser beams to two bending surfaces of the plates, images of the corresponding two laser beams are collected by the high-definition camera on the side, and an included angle of the laser beams on two sides of the plates is determined according to the images of the two laser beams at the same moment, wherein the included angle is the bending angle of the plates at the moment. The angle correction system may also use other devices or methods to detect the angle of the plate in real time, which will not be described here.
Step S2: the angle correction system calculates the rebound angle according to the angle before rebound and the angle after rebound, and the calculation formula is as follows: rebound angle = post rebound angle-pre rebound angle.
Step S3: and calculating compensation stroke data of the upper beam of the bending machine when the upper beam of the bending machine is bent next time according to the rebound angle, namely, the stroke data of the upper beam of the bending machine which needs to go downwards more than before when the upper beam of the bending machine is bent next time, so as to meet the bending compensation of the plate. The compensation travel data corresponding to the rebound angle is calculated by an internal calculation module of a control system of the bending machine, the calculation process is determined according to the performance of the bending machine and the characteristics of the plate, and various factors which possibly influence bending precision such as the performance reduction rate of the bending machine, the elastic coefficient of the plate and the like can be taken into consideration, so that the compensation method has higher accuracy and adaptability compared with a compensation mode of directly setting the compensation angle value through manual measurement in the prior art.
Step 4: and the control system controls the return stroke of the bending machine, and the correction of the bending angle is finished.
Example 1:
the width of the V-shaped opening of the lower die of the bending machine adopted in the embodiment is 100mm, and the angle of the V-shaped opening is 78 degrees. Setting parameters of a plate through a control system of the bending machine: the length of the plate is 1200mm, the thickness of the plate is 7mm, the plate is made of an iron plate, the allowable value of the bending angle is set to be 0.3 degrees, the bending target angle of the plate is set to be 135 degrees, and the preset bending angle is set to be 138 degrees.
The control system controls the bending machine to pre-bend the plate, and the angle correction system detects that the actual pre-bending angle of the plate is 136.1 degrees in the state that the upper die of the bending machine presses the plate, namely the rebound angle before pre-bending release. The control system controls the bending machine to release the plate, after the bending machine does not press the plate, the angle correction system detects that the rebound angle of the plate after the plate is completely released is 139.7 degrees, the rebound angle of the plate is 3.6 degrees, and the compensation stroke data which need to be taken more when the upper beam of the bending machine is bent next time is calculated to be 3.81mm and fed back to the control system.
The control system controls the bending machine to execute compensation bending, namely, the compensation stroke data is added to the stroke data of the upper beam walking of the bending machine by 3.81mm, then bending is performed again, and the bending angle of the plate is detected through the angle correction system after bending, namely, the angle before rebound of the plate is 132.2 degrees before releasing again. The control system controls the bending machine to release the plate, and after the bending machine does not press the plate, the angle correction system detects that the rebound angle of the plate after the plate is completely released is 135.1 degrees, is larger than the bending target angle 135 degrees and has an error of 0.1 degree, and is smaller than the bending angle tolerance value of 0.3 degrees.
And the control system judges that the bending angle is qualified, the bending machine system controls the return stroke of the bending machine, and the correction of the bending angle is finished.
Example 2:
the width of the V-shaped opening of the lower die of the bending machine adopted in the embodiment is 100mm, and the angle of the V-shaped opening is 78 degrees. Setting parameters of a plate through a control system of the bending machine: the length of the plate is 1200mm, the thickness of the plate is 7mm, the plate is made of an iron plate, the allowable value of the bending angle is set to be 0.3 degrees, the bending target angle of the plate is set to be 135 degrees, and the preset bending angle is set to be 138 degrees.
The control system controls the bending machine to pre-bend the plate, and the angle correction system detects that the actual pre-bending angle of the plate is 136.3 degrees in the state that the upper die of the bending machine presses the plate, namely the rebound angle before pre-bending release. The control system controls the bending machine to release the plate, after the bending machine does not press the plate, the angle correction system detects that the rebound angle of the plate after the plate is completely released is 139.5 degrees, the rebound angle of the plate is 3.2 degrees, and the compensation stroke data which need to be taken more when the upper beam of the bending machine is bent next time is 3.425mm and fed back to the control system.
The control system controls the bending machine to execute compensation bending, namely, the compensation stroke data 3.425mm are added to the stroke data of the upper beam walking of the bending machine, then bending is carried out again, and after bending, the bending angle of the plate is detected through the angle correction system, namely, the angle before rebound of the plate is 133.1 degrees before the plate is released again. The control system controls the bending machine to release the plate, after the bending machine does not press the plate, the angle correction system detects that the rebound angle of the plate after the plate is completely released is 135.9 degrees, the error between the rebound angle and the bending target angle of 135 degrees is 0.9 degrees, and the error exceeds the allowable value of the bending angle by 0.3 degrees, and the second compensation bending is required to be executed. The angle correction system calculates a rebound angle of 2.8 degrees, calculates the compensation travel data of 1.75mm which is needed to be taken more when the upper beam of the bending machine is bent next time, and feeds back the compensation travel data to the control system.
The control system controls the bending machine to execute compensation bending, namely, the compensation stroke data is added to the stroke data of the upper beam walking of the bending machine by 1.75mm, then bending is carried out again, and the bending angle of the plate is detected through the angle correction system after bending, namely, the angle before rebound of the plate before releasing again is 132.5 degrees. The control system controls the bending machine to release the plate, and after the bending machine does not press the plate, the angle correction system detects that the rebound angle of the plate after the plate is completely released is 134.9 degrees, is smaller than the bending target angle 135 degrees and has an error of 0.1 degree, and is smaller than the bending angle allowance value of 0.3 degrees.
And the control system judges that the bending angle is qualified, the bending machine system controls the return stroke of the bending machine, and the correction of the bending angle is finished.
Example 3:
the width of the V-shaped opening of the lower die of the bending machine adopted in the embodiment is 100mm, and the angle of the V-shaped opening is 78 degrees. Setting parameters of a plate through a control system of the bending machine: the length of the plate is 1200mm, the thickness of the plate is 7mm, the plate is made of an iron plate, the allowable value of the bending angle is set to be 0.3 degrees, the bending target angle of the plate is set to be 135 degrees, and the preset bending angle is set to be 138 degrees.
The control system controls the bending machine to pre-bend the plate, and the angle correction system detects that the actual pre-bending angle of the plate is 136.4 degrees in the state that the upper die of the bending machine presses the plate, namely the rebound angle before pre-bending release. The control system controls the bending machine to release the plate, after the bending machine does not press the plate, the angle correction system detects that the rebound angle of the plate after the plate is completely released is 139.9 degrees, the rebound angle of the plate is 3.5 degrees, and the compensation stroke data which need to be taken more when the upper beam of the bending machine is bent next time is calculated to be 3.08mm and fed back to the control system.
The control system controls the bending machine to execute compensation bending, namely, the compensation stroke data is added to the stroke data of the upper beam walking of the bending machine, the bending operation is performed again after the compensation stroke data is added by 3.08mm, and the bending angle of the plate is detected through the angle correction system after bending, namely, the angle before rebound of the plate before the plate is released again is 133.8 degrees. The control system controls the bending machine to release the plate, after the bending machine does not press the plate, the angle correction system detects that the rebound angle of the plate after the plate is completely released is 136.4 degrees, the error between the rebound angle and the bending target angle of 135 degrees is 1.4 degrees, and the error exceeds the allowable value of the bending angle by 0.3 degrees, and the second compensation bending is required to be executed. The angle correction system calculates a rebound angle of 2.6 degrees, calculates the compensation travel data of 2.315mm which is needed to be taken more when the upper beam of the bending machine is bent next time, and feeds back the compensation travel data to the control system.
The control system controls the bending machine to execute compensation bending, namely, the compensation stroke data 2.315mm are added to the stroke data of the upper beam walking of the bending machine, then bending is carried out again, and the bending angle of the plate is detected through the angle correction system after bending, namely, the angle before rebound of the plate before releasing again is 131.9 degrees. The control system controls the bending machine to release the plate, after the bending machine does not press the plate, the angle correction system detects that the rebound angle of the plate after the plate is completely released is 134.2 degrees, is smaller than the bending target angle 135 degrees and has an error of 0.8 degrees, and exceeds the bending angle allowable value of 0.3 degrees.
The control system judges that the bending angle is unqualified, and gives an abnormal angle alarm, the bending machine system controls the return stroke of the bending machine, and the correction of the bending angle is finished.
The foregoing description of the preferred embodiments of the invention is not intended to limit the scope of the invention, and therefore, any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (3)
1. A bending angle correction method for a bending machine is characterized by comprising the following steps: the method comprises the following steps:
step 1: the angle correction system of the bending machine sends a pre-bending angle signal to the control system; the angle correction system is arranged on the lower beam of the bending machine and is used for collecting bending angle parameters of the plate in real time;
step 2: the control system controls the bending machine to pre-bend the plate and calculates compensation stroke data;
in the step 2, the specific steps of pre-bending the plate are as follows:
step 2.1: the control system controls the bending machine to execute a pre-bending action on the plate according to the pre-bending angle signal and the bending target angle, releases the pre-bent plate, and detects the pre-bending actual angle of the plate through the angle correction system, namely the rebound angle of the plate after being released;
the pair of laser transmitters and the high-definition cameras are symmetrically arranged on two sides of a lower beam of the bending machine, the pair of laser transmitters respectively emit laser beams to two bending surfaces of the plate, the images of the two corresponding laser beams are collected through the high-definition cameras on the side, and the included angle of the laser beams on the two sides of the plate is determined according to the images of the two laser beams at the same moment, and is the bending angle of the plate at the moment;
step 2.2: the angle correction system feeds back the detected actual angle of the pre-bending to the control system, and the control system compares the actual angle of the pre-bending with the bending target angle:
I. if the actual angle of the pre-bending is larger than the bending target angle, executing the step 2.3;
II. If the actual angle of the pre-bending is equal to the bending target angle, the plate bending process is completed, and the step 4 is carried out;
III, if the actual angle of the pre-bending is smaller than the bending target angle, an abnormal angle alarm is sent out, and the step 4 is carried out;
in the step 2.2, when the actual angle of the pre-bending is compared with the bending target angle, a bending angle allowance value is set through the control system, and when the allowance value of the actual angle of the pre-bending and the bending target angle is less than or equal to the bending angle allowance value, the control system judges that the actual angle of the pre-bending is equal to the bending target angle;
step 2.3: the angle correction system detects and calculates compensation travel data of the plate and feeds the compensation travel data back to the control system;
step 3: the control system controls the bending machine to execute compensation bending on the plate;
the specific steps of the compensating bending of the plate are as follows:
step 3.1: the control system controls the bending machine to execute bending action according to the compensation stroke data, releases the compensated plate after bending, and detects the actual bending angle of the plate through the angle correction system, namely the rebound angle of the plate after being released again;
step 3.2: the angle correction system feeds back the detected bending actual angle to the control system, and the control system compares the bending actual angle with the bending target angle:
I. if the actual bending angle is larger than the target bending angle, executing the step 3.3;
II. If the actual bending angle is equal to the bending target angle, finishing the plate bending process, and turning to the step 4;
III, if the actual bending angle is smaller than the bending target angle, an abnormal angle alarm is sent out, and the step 4 is carried out;
in the step 3.2, when the bending actual angle and the bending target angle are compared, a bending angle allowance value is set through the control system, and when the bending actual angle is equal to or less than the bending target angle allowance value, the control system judges that the bending actual angle is equal to the bending target angle;
step 3.3: the angle correction system detects and calculates compensation travel data of the plate, and feeds back the compensation travel data to the control system, and the step 3.1 is returned;
the detection and calculation method of the compensation travel data of the plate comprises the following steps:
step S1: the angle correction system detects the angle before rebound before the release of the plate and the angle after rebound after the complete release of the plate; the angle correction system detects the bending angle of the plate in real time in the release process of the plate, compares the currently detected bending angle value with the last bending angle value, reserves a larger bending angle value, and takes the detected bending angle maximum value as the angle after rebound;
step S2: the angle correction system calculates the rebound angle according to the angle before rebound and the angle after rebound, and the calculation formula is as follows: rebound angle = rebound post angle-rebound pre angle;
step S3: calculating compensation travel data of the upper beam of the bending machine in the next bending process according to the rebound angle; the compensation travel data corresponding to the rebound angle is calculated by a calculation module in a control system of the bending machine, and the calculation process is determined according to the performance of the bending machine and the characteristics of the plate;
step 4: the control system controls the return stroke of the bending machine, and the correction of the bending angle is finished;
in the step 1, the pre-bending angle signal includes a pre-bending set angle, and the pre-bending angle set value is larger than the bending target angle.
2. The bending angle correction method for a bending machine according to claim 1, characterized by: the preset bending set angle is 2-5 degrees larger than the bending target angle.
3. The bending angle correction method for a bending machine according to claim 1, characterized by: the angle of the bending allows a value of 0.3 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011439264.9A CN112718942B (en) | 2020-12-08 | 2020-12-08 | Bending angle correction method for bending machine |
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| DE3739173A1 (en) * | 1987-11-19 | 1989-06-01 | Feintool Int Holding | METHOD AND DEVICE FOR BENDING WORKPIECES |
| PT1011886E (en) * | 1997-06-20 | 2002-07-31 | Luciano Gasparini | PRESS FOR FOLDING METAL SHEETS |
| EP1277529B1 (en) * | 2000-01-17 | 2008-05-28 | AMADA COMPANY, Ltd. | Bending method and bending apparatus |
| ITPR20040010A1 (en) * | 2004-02-18 | 2004-05-18 | Set 2002 S R L | PROCEDURE AND PNEUMATIC DEVICE FOR DETECTING THE BENDING ANGLE OF A SHEET OF SHEET IN A FOLDING PRESS. |
| CN201755607U (en) * | 2010-07-23 | 2011-03-09 | 杭州捷塔科技有限公司 | On-line detecting and compensating device used in bend pipe processing |
| CN102240703B (en) * | 2011-04-21 | 2013-12-04 | 中国电子科技集团公司第十四研究所 | Non-contact dieless processing forming angle measuring method |
| CN103575238B (en) * | 2013-10-10 | 2016-02-24 | 西安交通大学 | A kind of bender angle detection device |
| CN105880332B (en) * | 2015-01-26 | 2018-05-22 | 上海宝钢高新技术零部件有限公司 | Hydraulic pressure hollow pipe fitting springback control device |
| CN105251823B (en) * | 2015-09-17 | 2017-08-04 | 中国石油天然气集团公司 | A kind of cold steel pipe machine automation control system of vertical hydraulic and method |
| CN205701948U (en) * | 2016-06-02 | 2016-11-23 | 广州大学 | There is automatization's bender of visualization function |
| CN106599517B (en) * | 2016-12-30 | 2019-09-20 | 南京埃斯顿自动化股份有限公司 | A kind of bearing calibration of bending angle based on technological data bank and sliding block depth |
| CN108435856B (en) * | 2018-04-13 | 2020-03-17 | 吉林长光启元自动化控制有限公司 | Bender slider positioning compensation method, system, equipment and numerical control system |
| CN109248940B (en) * | 2018-08-27 | 2019-11-29 | 宁波欣达（集团）有限公司 | The bending method of automatic integrated system and application automatic integrated system |
| CN109482671A (en) * | 2018-11-13 | 2019-03-19 | 郑丽丽 | A kind of bending plate angle detection device |
| CN210586544U (en) * | 2019-08-06 | 2020-05-22 | 江阴市宏业机械制造有限公司 | Pipe bending machine capable of automatically detecting and memorizing compensation rebound angle |
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