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CN-121988616-A - Rolling system for titanium alloy rod and wire composite production

CN121988616ACN 121988616 ACN121988616 ACN 121988616ACN-121988616-A

Abstract

The invention relates to the technical field of metal pressure processing control and discloses a rolling system for titanium alloy rod and wire composite production, which comprises a basic rolling unit, a signal synchronous acquisition module, a characteristic extraction and state arbitration module, a rheological impedance analysis module and a rigidity dynamic compensation controller, wherein the basic rolling unit comprises a frame and a hydraulic pressing device, the signal synchronous acquisition module is used for acquiring the pressure and displacement of a hydraulic cylinder, the characteristic extraction and state arbitration module is used for judging a steady state or a non-steady state interval, the rheological impedance analysis module is used for calculating an instantaneous plastic rheological modulus in the non-steady state interval, and the rigidity dynamic compensation controller is used for generating an additional position compensation instruction 5.0Mm very small specification wire rod and large coil heavy coiled material.

Inventors

  • XIAO YONG
  • GUO SHAOGANG
  • ZHONG WENJUN

Assignees

  • 西安威科多机电设备有限公司

Dates

Publication Date
20260508
Application Date
20251211

Claims (10)

  1. 1. A rolling system for composite production of titanium alloy rods and wires, comprising: A basic rolling unit configured as a composite production line comprising a rod production branch line and a wire production branch line connected by a separator, the production line being configured with a two-roll high-strength short-stress-line roughing mill train and a cantilever heavy-duty roll collar pre-finishing mill train, each train comprising a stand, a roll, a hydraulic pressing device and a main transmission; The signal synchronous acquisition module is connected with the hydraulic pressing device and the main transmission device and is used for synchronously acquiring the hydraulic cylinder pressure P and the hydraulic cylinder displacement S; The feature extraction and state arbitration module is connected with the signal synchronous acquisition module and is used for calculating the pressure change rate and the displacement change rate and judging whether the rolling process is in a steady-state interval or an unsteady-state interval based on the energy mutation threshold value; the rheological impedance analysis module is connected with the feature extraction and state arbitration module; The system comprises a dynamic stiffness compensation controller, a rheological impedance analysis module, a hydraulic pressing device, a characteristic extraction and state arbitration module, a hydraulic pressing device and a hydraulic pressure control device, wherein the dynamic stiffness compensation controller is connected with the rheological impedance analysis module and the hydraulic pressing device; The rheological impedance analysis module separates a pressure response component with the same frequency as the high-frequency sine position excitation signal from the hydraulic cylinder pressure by utilizing a phase-locked demodulation logic, and inverts the steady-state rheological modulus of the rolled piece based on the amplitude ratio of the pressure response component and the high-frequency sine position excitation signal so as to take over the output of the instantaneous plastic rheological modulus; The stiffness dynamic compensation controller generates additional position compensation instructions based on the instantaneous plastic rheological modulus or the steady state rheological modulus and superimposes the additional position compensation instructions on the hydraulic pressure pressing device to dynamically adjust the equivalent stiffness of the system.
  2. 2. The rolling system for composite production of titanium alloy rods and wires according to claim 1, wherein the feature extraction and state arbitration module further comprises a causal coherence gating unit for calculating the absolute value of the product of the pressure change rate and the displacement change rate in real time and generating a coherence index based on the ratio of the absolute value of the product to the square of the pressure change rate, and when the coherence index is greater than a preset effective coupling threshold, the feature extraction and state arbitration module transmits the pressure change rate and the displacement change rate to the rheological impedance analysis module, otherwise, blocks signal transmission and maintains the output instruction of the previous control period, and utilizes physical causality to filter the uncoupled background noise of the hydraulic system.
  3. 3. The rolling system for composite production of titanium alloy rods and wires according to claim 1, wherein the stiffness dynamic compensation controller further comprises a variable gain damping adjustment unit, wherein the variable gain damping adjustment unit stores a preset mapping relation between rheological modulus and damping gain, and the stiffness dynamic compensation controller synchronously generates dynamic speed differential gain based on the current instantaneous plastic rheological modulus or steady state rheological modulus and the mapping relation while generating additional position compensation instructions, and injects the dynamic speed differential gain into a servo inner ring of the hydraulic pressing device so as to monotonically increase the equivalent damping ratio of the system along with the increase of rheological modulus of a rolled piece.
  4. 4. The rolling system for composite production of titanium alloy rods and wires according to claim 1, wherein the rheological impedance analysis module further comprises a hysteresis energy analysis unit for integrating pressure displacement tracks in an unsteady state interval in a phase plane taking pressure and displacement as coordinates to calculate a hysteresis loop area of a micro-deformation period, and the stiffness dynamic compensation controller generates an elastoplastic ratio correction factor based on the ratio of the hysteresis loop area to total deformation energy and performs monotonically negative correlation weighted correction on the system target stiffness by using the correction factor.
  5. 5. The rolling system for composite production of titanium alloy rods and wires according to claim 1, wherein the signal synchronous acquisition module comprises a high frequency data link for synchronously acquiring hydraulic cylinder pressure and hydraulic cylinder displacement at a sampling frequency of not less than one kilohertz, and the feature extraction and state arbitration module comprises a sliding time window analyzer for calculating a variance of the hydraulic cylinder pressure within a time window of a preset length and immediately triggering the rheological impedance analysis module to enter an analysis mode of an unstable state interval when the variance exceeds a preset bite identification threshold.
  6. 6. The rolling system for composite production of titanium alloy rods and wires according to claim 1, wherein the rheological impedance analysis module is pre-stored with a rolling mill structural rigidity curve M (P) and calculates the instantaneous plastic rheological modulus according to the following impedance separation calculation Wherein dP/dS is the ratio of the pressure change rate to the displacement change rate, and the rigidity dynamic compensation controller is based on the solution Additional position compensation instructions are generated.
  7. 7. The rolling system for composite production of titanium alloy rods and wires according to claim 1, wherein the frequency of the high-frequency sinusoidal position excitation signal injected by the micro-disturbance active detection unit is set to be higher than the first-order natural frequency of the stand and lower than the servo cut-off frequency of the hydraulic pressing device, and the phase-locked demodulation logic comprises a quadrature signal generator and a low-pass filter for multiplying and integrating the hydraulic cylinder pressure with an in-phase reference signal and a quadrature reference signal respectively to extract amplitude and phase information of a pressure response component.
  8. 8. The rolling system for composite production of titanium alloy rods and wires according to claim 1, wherein the stiffness dynamic compensation controller further comprises a thermal drift compensation unit for receiving an externally input actual temperature signal of a rolled piece and calculating a thermal softening coefficient based on a temperature variable flow model of a titanium alloy material, and the rheological impedance analysis module performs normalization correction on an inversion result by using the thermal softening coefficient when inverting a steady-state rheological modulus.
  9. 9. The rolling system for composite production of titanium alloy rods and wires according to claim 1, further comprising a section factor correction unit for storing geometric correction coefficients corresponding to different rod and wire hole patterns, wherein the rheological impedance analysis module is used for retrieving the geometric correction coefficient corresponding to the current production specification to weight the calculation result when inverting or resolving the instantaneous plastic rheological modulus, and eliminating nonlinear distortion influence of the hole pattern geometric shape on pressure response.
  10. 10. The rolling system for composite production of titanium alloy rods and wires according to claim 1, wherein the feature extraction and state arbitration module further comprises a safety interrupt logic unit for monitoring the system pressure response amplitude after the high-frequency sinusoidal position excitation signal is injected by the micro-disturbance active detection unit in real time, and when the system pressure response amplitude exceeds a preset safety protection threshold value, the injection of the high-frequency sinusoidal position excitation signal is immediately and forcedly terminated, and the rigidity dynamic compensation controller is switched to a position feedback-based position protection control mode to prevent active excitation from inducing system resonance instability under abnormal working conditions.

Description

Rolling system for titanium alloy rod and wire composite production Technical Field The invention relates to a rolling system for composite production of titanium alloy rods and wires, and belongs to the technical field of metal pressure processing control. Background In order to solve the problems of high energy consumption and low efficiency caused by sectional multi-fire heating in the traditional titanium alloy production, a composite production line based on a two-roll high-strength short-stress-line roughing mill set, a middle mill set and a cantilever type heavy-duty roll collar pre-finishing mill set is gradually carried out in the industry, although the production line flexibly realizes the in-line production of bars and wires through a steel divider, and realizes the whole-line torsion-free and micro-tension rolling by using the processes of rough middle rolling disengagement and subsequent continuous rolling, the complex process architecture also introduces new control problems that particularly in the disengagement rolling stage of rough middle rolling, the frequent bite impact obviously increases the unsteady disturbance of a system, the current material rolling process shows strain rate sensitivity and rheological nonlinearity, currently, an automatic thickness control system based on P-H diagrams, namely rolling force and roll gap relation is generally adopted in the industry, the system presets rolling modulus of rolling mill to be static constants based on a spring equation, and supposes that the rolling modulus of rolling piece is slowly changed along with temperature, the dimensional accuracy of the product is maintained through a thickness gauge deviation adjustment device, however, the rolling alloy is obviously controlled in a rolling strategy, and particularly in the steady state in the process of manufacturing steel alloy production is exposed in the conventional rolling stage, and the alloy production is obviously limited in the steady state, the rolling strategy is controlled in the process is exposed, and the rolling stage is not exposed, so that the rolling alloy is in the production process is in the conventional process is exposed, and the rolling process is greatly limited to the production process is greatlyWhen 5.0mm of small-size wire or large-disc heavy coiled material is heated, because the titanium alloy is poor in heat conduction and quick in temperature drop, a high-frequency induction heater and other heat supplementing devices are often required to be additionally arranged between rough rolling and middle rolling in the prior art, so that the energy consumption of a production line is greatly increased, the internal tissues of the material are easily damaged, meanwhile, the instantaneous deformation resistance of the titanium alloy material is subjected to millisecond-level hardening or softening mutation due to severe change of the strain rate, signal transmission and execution are carried out after the thickness gauge is relied on based on feedback adjustment control logic, inherent time lag exists, the transient coupling relation between the elastic deformation of a rolling mill and the plastic deformation of the material in millisecond-level time window cannot be decoupled in real time, and the actual roll gap adjustment command is delayed due to time sequence and model mismatch. In order to cope with the above challenges, some schemes of attempting to improve the quality of products by optimizing rolling process parameters also appear in the prior art, for example, the chinese patent of the grant publication No. CN114178310B discloses a method for rolling titanium alloy rod and wire by adopting multiple passes, in which a heat treatment system such as sectional preheating, multi-section heat preservation and annealing after rolling is finely set, and the strength and plasticity of the rod and wire are attempted to be ensured by offline process solidification, however, as far as deep analysis is known, the method is basically based on open-loop control of a static empirical model, the deformation resistance of a preset material under a specific temperature and pass is constant or follows an ideal curve, once the rheological modulus is instantaneously mutated due to biting impact or tiny temperature drop under the actual working condition of high-speed continuous rolling, and the process method depending on the preset parameters lacks the capability of real-time sensing the mechanical state of a rolling interface, cannot generate a dynamic stiffness compensation command immediately, and the system can only passively wait for a subsequent feedback signal. Therefore, the transient mechanical response between the decoupling rolling mill and the rolled piece can be perceived in real time, zero-time-delay rigidity matching is realized at the moment of unsteady deformation, and the size fluctuation rolling system caused by control hysteresis is avoided, so that the meth