CN-122008620-A - Multi-working-procedure composite stamping forming die control method and system

CN122008620ACN 122008620 ACN122008620 ACN 122008620ACN-122008620-A

Abstract

The application provides a control method and a system for a multi-process composite stamping forming die, which are applied to the technical field of die production, and are used for synchronously acquiring multi-source operation state data streams in a multi-process stamping forming process, extracting associated characteristic parameters reflecting physical synergistic relationship to construct a standard operation mode reference, further calculating the deviation degree of the current stamping cycle in real time, identifying the deviation type and finally carrying out self-adaptive compensation adjustment on motion control parameters or process load parameters of a stamping executing mechanism. The method effectively solves the problems that in the prior art, the sustainability and low-amplitude deviation are difficult to identify and compensate due to the microscopic characteristic difference of raw materials and the abrasion accumulation of the die parts, can accurately capture the fine and accumulated deviation in the stamping process, and can conduct targeted compensation according to the deviation type, thereby avoiding the generation of batch defects of products and having the advantages of remarkably improving the yield and the production stability of the products.

Inventors

LIN CHEN
SHI SHAOQIANG

Assignees

汕头大学
广东源鑫精密模具科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260407

Claims (10)

1. The control method of the multi-station composite stamping forming die is characterized by comprising the following steps: s1, synchronously acquiring multi-source running state data streams in a multi-procedure stamping forming process; s2, extracting associated characteristic parameters reflecting physical cooperative relations among the multisource operation state data streams to construct a standard operation mode reference representing the optimal working condition; S3, extracting the associated characteristic parameters of the current stamping cycle in real time to generate a real-time operation mode vector; S4, calculating the comprehensive deviation degree of the real-time operation mode vector relative to the standard operation mode reference; S5, judging whether the comprehensive deviation degree meets a preset continuous deviation condition, and identifying the type of the characteristic component causing the deviation when the comprehensive deviation degree meets the preset continuous deviation condition; and S6, carrying out self-adaptive compensation adjustment on the motion control parameter or the process load parameter of the punching executing mechanism according to the identified characteristic component type.
2. The multi-process composite press forming die control method according to claim 1, wherein step S1 includes: S11, acquiring real-time position information of the punching executing mechanism through a position detecting element at a sampling frequency not lower than 10 kHz; S12, synchronously acquiring instantaneous load data in the stamping process through a pressure detection element; s13, acquiring initial pose offset data of a plate to be punched through a non-contact displacement sensor; And S14, performing time stamp alignment processing on the real-time position information, the instantaneous load data and the initial pose offset data by using a high-speed data acquisition module so as to generate the multi-source running state data stream.
3. The method according to claim 1, wherein in the step S2, the associated characteristic parameter includes at least one of a time difference between a pressure peak and a displacement bottom dead center, an instantaneous slope ratio between a pressure signal and a position signal, and an oscillation characteristic of the position signal in a predetermined frequency band.
4. A multi-process composite stamping forming die control method as claimed in claim 3, wherein step S2 comprises: s21, under a preset optimal working condition, recording the multi-source running state data stream with continuous preset cycle times; s22, carrying out statistical analysis on the recorded multi-source running state data streams, and extracting the associated characteristic parameters reflecting the cooperative characteristics among the data streams; s23, constructing a multi-dimensional standard mode vector according to the associated characteristic parameters, and taking the multi-dimensional standard mode vector as the standard operation mode reference.
5. The multi-process composite press forming die control method according to claim 1, wherein step S3 includes: s31, carrying out digital signal processing on the multi-source operation state data stream so as to extract dynamic characteristics of the multi-source operation state data stream in a frequency domain or a time-frequency domain; The digital signal processing includes a fast fourier transform or a wavelet transform S32.
6. The method for controlling a multi-process composite stamping forming die as claimed in claim 1, wherein step S4 includes: s41, calculating Euclidean distance or Mahalanobis distance between the real-time operation mode vector and the standard operation mode reference, and taking the calculation result as the comprehensive deviation degree.
7. The method for controlling a multi-process composite stamping forming die as claimed in claim 1, wherein step S5 includes: s51, judging that the continuous deviation condition is met when the comprehensive deviation exceeds an early warning threshold value in a continuous preset number of stamping cycles; and S52, identifying the characteristic component type according to the deviation weight of each characteristic component in the real-time operation mode vector, wherein the characteristic component type comprises material characteristic deviation and mechanical clearance deviation.
8. The method for controlling a multi-process composite stamping forming die as claimed in claim 7, wherein step S6 includes: S61, when the characteristic component type is the material characteristic deviation, adjusting the blank holder force in the process load parameter; And S62, when the characteristic component type is the mechanical clearance deviation, adjusting the punching depth or the instantaneous speed curve of the sliding block in the motion control parameters.
9. The method of controlling a multi-process composite stamping forming die as claimed in claim 8, wherein step S61 includes: S611, if the characteristic component reflecting the time difference between the pressure peak value and the displacement bottom dead center in the real-time operation mode vector continuously increases or the characteristic component reflecting the instantaneous slope ratio between the pressure signal and the position signal continuously decreases, judging that the rebound quantity of the plate is increased; S612, increasing the blank holder force according to the increasing degree of the rebound quantity of the plate material, and finely adjusting the stamping depth of the subsequent shaping process; step S62 includes: s621, judging that the stamping executing mechanism shakes if the characteristic component reflecting the oscillation amplitude of the position signal in the preset frequency band in the real-time operation mode vector continuously increases or the characteristic component reflecting the energy density of the specific frequency component continuously increases; S622, adjusting the driving current or the opening degree of a valve to change the instantaneous speed curve of the sliding block or applying a compensation moment opposite to the shaking direction when the punching executing mechanism descends to be close to the bottom dead center so as to inhibit or attenuate the shaking.
10. A multi-station composite stamping forming die control system for implementing the steps of the method of any one of claims 1-9, the system comprising: The data acquisition module is used for synchronously acquiring multi-source running state data streams in the multi-procedure stamping forming process; The reference construction module is used for extracting associated characteristic parameters reflecting physical cooperative relations among the multisource operation state data streams so as to construct a standard operation mode reference representing the optimal working condition; The vector generation module is used for extracting the associated characteristic parameters of the current stamping cycle in real time and generating a real-time operation mode vector; The deviation calculation module is used for calculating the comprehensive deviation degree of the real-time operation mode vector relative to the standard operation mode reference; The deviation identifying module is used for judging whether the comprehensive deviation degree meets a preset continuous deviation condition or not, and identifying the type of the characteristic component causing the deviation when the comprehensive deviation degree meets the preset continuous deviation condition; And the self-adaptive compensation module is used for carrying out self-adaptive compensation adjustment on the motion control parameter or the process load parameter of the punching execution mechanism according to the identified characteristic component type.

Description

Multi-working-procedure composite stamping forming die control method and system Technical Field The application relates to the technical field of die production, in particular to a multi-station composite stamping forming die control method and system. Background In modern industrial production, a multi-working-procedure composite stamping forming die system is a key device for manufacturing precise parts. The control method is characterized in that the sequence and execution logic of each process are accurately specified, and the logic is based on the presetting of ideal material performance and stable equipment operation so as to ensure the coordination of each process. However, there is a challenge in practical production that raw materials may have fine differences in deep layer characteristics of microstructure, internal stress, etc. from lot to lot even though they pass conventional inspection. This difference can cause the actual spring back of the material to deviate continuously, slightly from the preset compensation value of the control system during continuous high speed stamping. Such continuous minor deviations can gradually affect the positioning references of subsequent processes and the stress distribution inside the mold. At this time, the real-time position and pressure data collected by the sensor in the die, while still within the relaxed alarm threshold, have been stably deviated from the data track of the historical good products (e.g. slightly higher pressure peak and slightly biased position feedback). Meanwhile, the non-ideal stress distribution for a long time causes uneven micro abrasion of a die guide part (such as a guide post and a guide sleeve), and the fit clearance is increased, so that the sliding block can slightly shake during high-speed operation. The two effects are overlapped, so that the execution precision of the closed-loop control system is subjected to double interference, namely, the target position drifts and the physical instability of an execution platform is caused. Eventually, the accumulation of these minor deviations causes batch defects (e.g., burrs, angular deviations) in the product, and the yield decreases. Because the root of the problem is the deviation of multiple sources, low amplitude and interaction, rather than single equipment failure, the existing control method mainly aiming at clear abnormality cannot be effectively identified and compensated, and a new scheme capable of solving the complex cumulant problem is urgently needed. Disclosure of Invention In view of the shortcomings of the prior art, the application provides a control method and a system for a multi-station composite stamping forming die, which aim to solve the technical problems that in actual production of the multi-station composite stamping forming die, due to the microcosmic characteristic difference of raw materials and the continuous low-amplitude deviation caused by the abrasion accumulation of die parts, the existing control method is difficult to effectively identify and compensate, and finally, the batch defects and the yield of products are reduced. In a first aspect, a method for controlling a multi-working-procedure composite stamping forming die, the method comprising the steps of: s1, synchronously acquiring multi-source running state data streams in a multi-procedure stamping forming process; s2, extracting associated characteristic parameters reflecting physical cooperative relations among the multisource operation state data streams to construct a standard operation mode reference representing the optimal working condition; S3, extracting the associated characteristic parameters of the current stamping cycle in real time to generate a real-time operation mode vector; S4, calculating the comprehensive deviation degree of the real-time operation mode vector relative to the standard operation mode reference; S5, judging whether the comprehensive deviation degree meets a preset continuous deviation condition, and identifying the type of the characteristic component causing the deviation when the comprehensive deviation degree meets the preset continuous deviation condition; and S6, carrying out self-adaptive compensation adjustment on the motion control parameter or the process load parameter of the punching executing mechanism according to the identified characteristic component type. Further, step S1 includes: S11, acquiring real-time position information of the punching executing mechanism through a position detecting element at a sampling frequency not lower than 10 kHz; S12, synchronously acquiring instantaneous load data in the stamping process through a pressure detection element; s13, acquiring initial pose offset data of a plate to be punched through a non-contact displacement sensor; And S14, performing time stamp alignment processing on the real-time position information, the instantaneous load data and the initial pose offset data by using a high-speed