CN-122007217-A - Heavy longitudinal beam bending production line and bending production process thereof

CN122007217ACN 122007217 ACN122007217 ACN 122007217ACN-122007217-A

Abstract

The application relates to the technical field of longitudinal beam forming. The heavy longitudinal beam bending production line comprises the steps of obtaining displacement response, load response and strain response of a heavy longitudinal beam to be bent in the stages of dead weight supporting, clamping loading and micro-pressure loading, dividing the heavy longitudinal beam into a plurality of analysis sections along the length direction based on preprocessing response data, calculating nonlinear mechanical response characteristic parameters and residual stress release sensitivity parameters of the analysis sections, determining residual stress release characteristics of the analysis sections, determining bending control parameters according to the residual stress release characteristics of the analysis sections, performing coupling correction based on residual stress release differences between adjacent analysis sections to obtain a sectional bending control strategy, executing bending operation according to the sectional bending control strategy, and performing iterative adjustment based on deviation between forming response and preset target curvature. According to the application, the bending and forming consistency of the heavy longitudinal beam can be improved, and the risk of abrupt change of boundary curvature can be reduced.

Inventors

SUN KE
ZHANG HUAJIAN
WEI ZENGKUN
WANG QUAN
ZHANG XIQI

Assignees

中钰匠鑫机械制造有限公司

Dates

Publication Date: 20260512
Application Date: 20260330

Claims (10)

1. The bending production process of the heavy longitudinal beam is characterized by comprising the following steps of: S1, multi-source response data, including displacement response, load response and strain response, of a heavy longitudinal beam to be bent in the stages of dead weight support, clamping loading and micro-pressure loading are obtained, and preprocessing is carried out on the multi-source response data to obtain preprocessed response data; S2, dividing the heavy longitudinal beam into a plurality of analysis sections along the length direction based on the preprocessing response data, calculating nonlinear mechanical response characteristic parameters and residual stress release sensitivity parameters of each analysis section, and determining residual stress release characteristics of each analysis section according to the residual stress release sensitivity parameters; s3, determining corresponding bending control parameters according to residual stress release characteristics of each analysis segment, and performing coupling correction on the bending control parameters based on residual stress release differences between adjacent analysis segments to obtain a segmented bending control strategy; S4, executing bending operation according to the sectional bending control strategy, acquiring forming response of each analysis section in real time in the bending process, and iteratively adjusting the bending control parameters based on deviation between the forming response and a preset target curvature until forming errors of each analysis section meet a preset threshold condition.
2. The bending production process of the heavy longitudinal beam according to claim 1, wherein preprocessing the multi-source response data to obtain preprocessed response data comprises: S11, performing time alignment on the displacement response, the load response and the strain response, and performing filtering processing on response data after time alignment to eliminate acquisition noise; s12, identifying and eliminating abnormal response points beyond a preset change range, and performing interpolation complement or resampling processing on each response data after eliminating the abnormal response points to obtain the preprocessing response data.
3. The bending production process of the heavy-duty longitudinal beam according to claim 1, wherein dividing the heavy-duty longitudinal beam into a plurality of analysis segments in a length direction based on the preprocessing response data comprises: s21, acquiring length parameters of the heavy longitudinal beam along the length direction and preset segmentation parameters, and carrying out equal-length segmentation on the heavy longitudinal beam according to the preset segmentation parameters to obtain a plurality of initial analysis segments; s22, merging or subdividing and adjusting the adjacent initial analysis segments based on the displacement response variation amplitude, the load response variation amplitude and the strain response variation amplitude corresponding to each initial analysis segment to obtain the plurality of analysis segments.
4. A bending production process of a heavy-duty longitudinal beam according to claim 3, wherein calculating nonlinear mechanical response characteristic parameters and residual stress release sensitivity parameters of each analysis section comprises: s23, extracting nonlinear mechanical response characteristic parameters representing rigidity change based on the load-displacement relation of each analysis section in the stages of dead weight support, clamping loading and micro-pressure loading; S24, calculating residual stress release sensitivity parameters corresponding to the analysis segments based on the displacement hysteresis degree of the analysis segments in the loading process, residual displacement after unloading and strain change rate.
5. The bending production process of the heavy-duty longitudinal beam according to claim 4, wherein determining the residual stress release characteristics of each analysis section according to the residual stress release sensitivity parameter comprises: Comparing the residual stress release sensitivity parameters of the analysis sections with preset sensitivity intervals to determine the residual stress release characteristics of the analysis sections, specifically: The method comprises the steps of determining that an analysis section is an early release section when the residual stress release sensitivity parameter of the analysis section is larger than a first preset threshold value, determining that the analysis section is a delayed release section when the residual stress release sensitivity parameter of the analysis section is smaller than a second preset threshold value, and determining that the analysis section is a stable release section when the residual stress release sensitivity parameter of the analysis section is located between the first preset threshold value and the second preset threshold value.
6. The bending production process of the heavy-duty longitudinal beam according to claim 5, wherein determining the corresponding bending control parameters according to the residual stress release characteristics of each analysis segment comprises: for the advanced release section, on the basis of presetting a reference pressing speed, a reference pressing amount and a reference dwell time, at least one of the pressing speed, the pressing amount and the dwell time is subjected to reduction adjustment; For the delay release section, on the basis of presetting a reference depression speed, a reference depression amount and a reference dwell time, performing at least one of incremental adjustment on the depression speed, incremental adjustment on the depression amount and incremental adjustment on the dwell time; for the stable release section, presetting a reference pressing speed, a reference pressing amount, a reference dwell time and a reference unloading rate; And combining the pressing speed, pressing quantity, pressure maintaining time and unloading speed corresponding to each analysis section as the bending control parameters.
7. The bending production process of the heavy longitudinal beam according to claim 6, wherein the bending control parameters are subjected to coupling correction based on residual stress release differences between adjacent analysis segments to obtain a segmented bending control strategy, and the bending control strategy comprises: S31, calculating the difference value of the residual stress release sensitivity parameters between adjacent analysis segments to obtain an inter-segment release difference parameter, and determining a coupling influence coefficient between the adjacent analysis segments based on the inter-segment release difference parameter; S32, correcting at least one of the rolling reduction, the dwell time and the unloading rate of the current analysis section according to the coupling influence coefficient to obtain corrected bending control parameters; s33, generating the sectional bending control strategy based on the bending control parameters corrected by the analysis sections.
8. The bending production process of the heavy longitudinal beam according to claim 7, wherein at least one of the rolling reduction, the dwell time and the unloading rate of the current analysis section is modified according to the coupling influence coefficient to obtain modified bending control parameters, including: S321, determining a parameter correction amount corresponding to the current analysis segment based on the coupling influence coefficient corresponding to the current analysis segment and a release difference parameter between the current analysis segment and the adjacent analysis segment; S322, determining the inter-section transition constraint quantity of the current analysis section in at least one of the rolling reduction, the pressure maintaining time and the unloading rate based on the parameter correction quantity and the bending control parameters of the analysis sections adjacent to the current analysis section; s323, smoothly correcting at least one of the rolling reduction, the dwell time and the unloading rate of the current analysis section according to the parameter correction and the intersegmental transition constraint quantity to obtain corrected bending control parameters.
9. The bending production process of the heavy longitudinal beam according to claim 1, wherein iteratively adjusting the bending control parameter based on a deviation between the forming response and a preset target curvature comprises: S41, obtaining at least one of real-time curvature, real-time displacement or real-time strain of each analysis section in the bending process as the forming response, and calculating a deviation value between the forming response of each analysis section and a preset target curvature; S42, when the deviation value of a certain analysis section is larger than a preset adjustment threshold value, determining the analysis section as a target analysis section, and adjusting at least one of the reduction, the dwell time and the unloading rate corresponding to the target analysis section; s43, performing bending control again on the target analysis section based on the adjusted bending control parameters until the forming errors of the analysis sections meet the preset threshold condition.
10. A heavy stringer bending line for carrying out the production process according to any one of claims 1 to 9, comprising: The feeding conveying device is used for supporting and conveying the heavy longitudinal beam to be bent; The multipoint supporting device is arranged on the conveying path of the feeding conveying device and is used for carrying out multipoint support on the heavy longitudinal beam in a dead weight supporting state of the heavy longitudinal beam; the clamping loading device is arranged on one side or above the multipoint support device and is used for clamping and loading the heavy longitudinal beam; The micro-pressure loading device is used for applying a preset micro-pressure load to the heavy longitudinal beam before bending; The multi-source response detection device is used for acquiring displacement response, load response and strain response of the heavy longitudinal beam in the stages of dead weight support, clamping loading and micro-pressure loading; the bending forming device is arranged at the downstream of the feeding conveying device and is used for performing bending operation on the heavy longitudinal beam; The shaping response detection device is used for acquiring the shaping response of the heavy longitudinal beam in the bending process; The control device is respectively connected with the feeding conveying device, the multi-point supporting device, the clamping loading device, the micro-pressure loading device, the multi-source response detection device, the bending forming device and the forming response detection device, and is used for receiving multi-source response data acquired by the multi-source response detection device, controlling the bending forming device to execute bending operation according to a sectional bending control strategy, and carrying out feedback adjustment on the bending forming device according to forming response acquired by the forming response detection device.

Description

Heavy longitudinal beam bending production line and bending production process thereof Technical Field The application relates to the technical field of longitudinal beam forming, in particular to a heavy longitudinal beam bending production line and a bending production process thereof. Background In the field of engineering machinery, special vehicles and heavy-duty equipment manufacturing, heavy stringers are generally formed by bending steel plates to obtain a target structural shape as a key bearing member. Because the longitudinal beam is large in length, the cross section is complex in size change and high in bearing requirement, the bending forming quality of the longitudinal beam directly influences the assembly precision and the use reliability of the whole machine. The existing heavy longitudinal beam bending production process is generally controlled according to preset bending angles, pressing strokes and nominal mechanical performance parameters of materials, and after bending, forming errors are corrected through a correction procedure. However, in the actual production process, residual stress unevenly distributed in the length direction is introduced into the material during the steps of rolling, leveling, punching, trimming, carrying and clamping and the like. The residual stress presents asynchronous release characteristics in the bending process, so that the yield behavior, the rebound quantity and the curvature response of different positions are different. Because the prior art generally regards the longitudinal beam as an integral member with uniform material state, the spatial distribution of residual stress and the release process are not identified and modeled, so that the bending control parameters have adaptation deviation among different areas, and the adaptation deviation is particularly characterized in that after bending, the curvature fluctuates along the length direction, the local area is over-bent or under-bent, and the rebound discreteness is larger, so that the follow-up shape correction burden is increased, and the product consistency is reduced. Therefore, how to effectively identify the release characteristics of residual stress in each region of the longitudinal beam in the bending process and realize sectional differentiation control based on the characteristics so as to improve the bending forming consistency becomes a technical problem to be solved. Disclosure of Invention The application aims to provide a heavy longitudinal beam bending production line and a bending production process thereof, so as to solve the problems in the background technology. According to a first aspect of the application, there is provided a bending production process of a heavy-duty longitudinal beam, comprising the steps of: S1, multi-source response data, including displacement response, load response and strain response, of a heavy longitudinal beam to be bent in the stages of dead weight support, clamping loading and micro-pressure loading are obtained, and preprocessing is carried out on the multi-source response data to obtain preprocessed response data; S2, dividing the heavy longitudinal beam into a plurality of analysis sections along the length direction based on the preprocessing response data, calculating nonlinear mechanical response characteristic parameters and residual stress release sensitivity parameters of each analysis section, and determining residual stress release characteristics of each analysis section according to the residual stress release sensitivity parameters; s3, determining corresponding bending control parameters according to residual stress release characteristics of each analysis segment, and performing coupling correction on the bending control parameters based on residual stress release differences between adjacent analysis segments to obtain a segmented bending control strategy; S4, executing bending operation according to the sectional bending control strategy, acquiring forming response of each analysis section in real time in the bending process, and iteratively adjusting the bending control parameters based on deviation between the forming response and a preset target curvature until forming errors of each analysis section meet a preset threshold condition. The second aspect of the present application also provides a heavy stringer bending production line for implementing the bending production process of a heavy stringer, including: The feeding conveying device is used for supporting and conveying the heavy longitudinal beam to be bent; The multipoint supporting device is arranged on the conveying path of the feeding conveying device and is used for carrying out multipoint support on the heavy longitudinal beam in a dead weight supporting state of the heavy longitudinal beam; the clamping loading device is arranged on one side or above the multipoint support device and is used for clamping and loading the heavy longitudinal beam; The micro-pr