CN-121972520-A - Dynamic matching regulation and control method for metal rolling for production of automobile maintenance equipment

Abstract

The invention discloses a metal rolling dynamic matching regulation and control method for production of automobile maintenance equipment, which belongs to the technical field of rolling matching regulation and control and specifically comprises the steps of establishing an initial deformation resistance analysis model of a metal member, fusing the initial deformation resistance analysis model with the current roller rotating speed of an upstream rack, calculating a dynamic forward slip coefficient in the rolling process, generating a continuous second flow evolution track of a discharge end of the upstream rack according to the dynamic forward slip coefficient, extracting fluctuation characteristic quantity in the second flow evolution track, measuring and calculating micro-tension composite disturbance quantity between the upstream rack and the downstream rack, converting the micro-tension composite disturbance quantity into a rotating speed compensation instruction, constructing a dynamic matching regulation matrix of the rotating speed difference of the upstream rack, reconstructing a driving signal of the downstream rack according to the dynamic matching regulation matrix, generating a real-time driving current sequence of the downstream rack, injecting the real-time driving current sequence into an execution motor of the downstream rack, driving a roller of the downstream rack to operate according to the reconstruction rotating speed, and realizing dynamic balance of second flow between the racks.

Inventors

• LIN WENFU

Assignees

• 福州车福汽车维修服务有限公司

Dates

Publication Date

20260505

Application Date

20260407

Claims (8)

1. 1. The metal rolling dynamic matching regulation and control method for the production of the automobile maintenance equipment is characterized by comprising the following steps of: s1, collecting temperature field distribution, geometric dimensions and sound waves/surface characteristics of a metal member at an input end of an upstream frame, and establishing an initial deformation resistance analysis model of the metal member; s2, fusing the initial deformation resistance analysis model with the current roller rotating speed of the upstream frame, calculating a dynamic forward slip coefficient in the rolling process, and generating a continuous second flow evolution track of the discharge end of the upstream frame according to the dynamic forward slip coefficient; S3, extracting fluctuation characteristic quantity in a second flow evolution track, and measuring and calculating micro-tension compound disturbance quantity between an upstream frame and a downstream frame by combining an actual micro-tension feedback value observed in real time; s4, converting the micro-tension compound disturbance quantity into a rotation speed compensation instruction, and constructing a dynamic matching adjustment matrix of the rotation speed difference of the upstream and downstream frames; s5, reconstructing a driving signal of the downstream rack according to the dynamic matching adjustment matrix, and generating a real-time driving current sequence of the downstream rack; S6, injecting a real-time driving current sequence into an executing motor of the downstream rack, driving rollers of the downstream rack to operate according to the reconstruction rotating speed, and realizing dynamic balance of second flow among the racks.
2. 2. The method for dynamically matching and controlling metal rolling for producing automobile maintenance equipment according to claim 1, wherein in the step S1, the process of collecting the temperature field distribution, the geometric dimension and the sound wave/surface characteristics of the metal member at the input end of the upstream frame and establishing the initial deformation resistance analysis model of the metal member is as follows: scanning an upstream frame input end metal member by using a thermal infrared imager to obtain temperature field distribution, operating a laser profiler to measure geometric dimensions, and collecting acoustic wave characteristics and surface characteristics by using an ultrasonic probe; the temperature field distribution, the geometric dimension, the acoustic wave characteristics and the surface characteristics are gathered into a data processor, and a multidimensional physical state characteristic matrix of the metal component is constructed according to the time axis alignment of the acquisition time stamp; substituting the multidimensional physical state characteristic matrix into a metal material yield criterion equation, solving a functional relation between a state variable and a material constitutive constant, and establishing an initial deformation resistance analysis model of the metal member.
3. 3. The method for dynamically matching and controlling metal rolling for producing automobile maintenance equipment according to claim 1, wherein in the step S2, the initial deformation resistance analysis model and the current roll rotation speed of the upstream stand are fused, a dynamic forward slip coefficient in the rolling process is calculated, and a continuous second flow evolution track of the discharge end of the upstream stand is generated according to the dynamic forward slip coefficient: extracting yield stress distribution parameters in the initial deformation resistance analysis model, reading the current roller rotating speed of the upstream frame through a speed sensor, and converging the yield stress distribution parameters and the current roller rotating speed into a frame contact pressure function equation; solving a frame contact pressure function equation to obtain a neutral section position coordinate in an upstream frame deformation zone, and calculating an instantaneous neutral angle of a metal member in the rolling deformation zone according to the neutral section position coordinate and the physical radius of a roller of the upstream frame; The contact interface friction factor in the initial deformation resistance analysis model is called, a forward sliding kinematic equation is established by combining the contact interface friction factor, the instantaneous neutral angle and the current roller rotating speed, and the dynamic forward sliding coefficient in the rolling process is calculated by solving the forward sliding kinematic equation; And (3) combining the dynamic forward slip coefficient, the current roller rotating speed and the fixed sectional area of the discharge end of the upstream frame to establish an instantaneous flow calculation function, and fitting an output lattice of the instantaneous flow calculation function along a time axis to generate a continuous second flow evolution track of the discharge end of the upstream frame.
4. 4. The method for dynamically matching and regulating and controlling metal rolling for producing automobile maintenance equipment according to claim 1, wherein in the step S3, the process of extracting the fluctuation characteristic quantity in the second flow evolution track and calculating the micro-tension composite disturbance quantity between the upstream frame and the downstream frame by combining the real-time observed actual micro-tension feedback value is as follows: Carrying out orthogonal decomposition treatment on the continuous second flow evolution track, filtering a reference steady-state sequence of the continuous second flow evolution track, and extracting instantaneous amplitude kurtosis and spectrum variance of the residual track sequence as fluctuation characteristic quantity; substituting the fluctuation characteristic quantity into a tension transmission state equation between frames to perform feedforward deduction calculation, obtaining an expected tension deviation parameter caused by second flow fluctuation, and calling and introducing an actual micro-tension feedback value observed in real time; And (3) importing the expected tension offset parameter and the actual micro-tension feedback value into a disturbance observation matrix, and calculating the micro-tension composite disturbance quantity between the upstream frame and the downstream frame by utilizing a state gain node to carry out deviation summation operation.
5. 5. The method for dynamically matching and regulating metal rolling for producing automobile maintenance equipment according to claim 4, wherein the process of integrating the expected tension deviation parameter and the actual micro-tension feedback value into a disturbance observation matrix and calculating the micro-tension composite disturbance quantity between an upstream frame and a downstream frame by using a state gain node for carrying out deviation summation operation is as follows: establishing a disturbance observation matrix, defining an expected tension offset parameter as a positive reference vector and converging the positive reference vector into the disturbance observation matrix, and defining an actual micro-tension feedback value as a negative observation vector and converging the negative observation vector into the disturbance observation matrix; reading a positive reference vector and a negative observation vector of a disturbance observation matrix, guiding the positive reference vector and the negative observation vector into a state gain node, and carrying out deviation summation operation by using the state gain node; and extracting a tension deviation residual value sequence output by the deviation summation operation, substituting the tension deviation residual value sequence into a frame transmission rigidity compensation equation, and accordingly calculating the micro-tension compound disturbance quantity between an upstream frame and a downstream frame.
6. 6. The method for dynamically matching and regulating metal rolling for producing automobile maintenance equipment according to claim 1, wherein in the step S4, the process of converting the micro-tension composite disturbance quantity into a rotation speed compensation command and constructing a dynamic matching and regulating matrix of the rotation speed difference of the upstream and downstream frames is as follows: The micro-tension compound disturbance quantity is led into a tension and speed coupling relation equation between frames to carry out analysis operation, and instantaneous angular speed deviation parameters are solved; extracting instantaneous angular velocity deviation parameters, inputting the instantaneous angular velocity deviation parameters into a proportional-integral-derivative control algorithm unit, and outputting a rotating speed compensation instruction in a current regulation period through operation; extracting the current roller rotating speed of the upstream rack and the basic operating rotating speed of the downstream rack, and solving the transient rotating speed difference quantity of the upstream rack and the downstream rack by combining a rotating speed compensation instruction; substituting the transient rotation speed difference component into a system state space equation according to the physical topological order of the rack space, and constructing a dynamic matching adjustment matrix of the rotation speed difference of the upstream rack and the downstream rack.
7. 7. The method for dynamically matching and controlling metal rolling for producing automobile maintenance equipment according to claim 1, wherein in the step S5, the process of reconstructing the driving signal of the downstream rack according to the dynamically matching and adjusting matrix and generating the real-time driving current sequence of the downstream rack is as follows: analyzing the dynamic matching adjustment matrix to extract a rotating speed correction parameter of the downstream rack, superposing the rotating speed correction parameter with a reference operating frequency of the downstream rack, and reconstructing a driving signal of the downstream rack; leading the reconstructed driving signal of the downstream frame into a motor torque model, solving a quadrature axis current reference value and a direct axis current reference value through coordinate transformation operation, and synthesizing a target current control instruction; and injecting a target current control instruction into the pulse width modulation inversion unit, controlling the triggering and conducting sequence of a power switch tube in the inversion unit, and generating a real-time driving current sequence of the downstream rack.
8. 8. The method for dynamically matching and controlling metal rolling for producing automobile maintenance equipment according to claim 1, wherein in the step S6, the real-time driving current sequence is injected into the execution motor of the downstream rack, the rollers of the downstream rack are driven to operate according to the reconstruction rotation speed, and the process of realizing the dynamic balance of second flow among the racks is as follows: injecting a real-time driving current sequence into a stator winding of an execution motor of a downstream rack, exciting a rotating magnetic field in an internal air gap of the execution motor, and enabling a rotor spindle of the execution motor to output mechanical torque; transmitting the mechanical torque output by the execution motor to a roller assembly of a downstream rack through a mechanical transmission mechanism, overcoming rolling deformation resistance, and driving rollers of the downstream rack to operate according to a reconstruction rotating speed; The method includes the steps of using rollers of a downstream frame operating at a reconstruction rotational speed to physically pull a metal member, forcibly changing the linear velocity of the metal member traveling at the downstream frame, and aligning the instantaneous second flow of the metal member traveling at the upstream and downstream frames.

Description

Dynamic matching regulation and control method for metal rolling for production of automobile maintenance equipment Technical Field The invention relates to the technical field of rolling matching regulation and control, in particular to a metal rolling dynamic matching regulation and control method for production of automobile maintenance equipment. Background The rapid development of the automobile maintenance industry has led to an increasing demand for high-strength and high-precision metal bearing members by automobile maintenance equipment such as lifts, girder correction instruments and the like. In the production and manufacturing links of these metal members, a multi-stand continuous rolling process is widely used by virtue of its high productivity and good continuous forming ability. In the continuous rolling process, the metal blank sequentially passes through a plurality of rolling mill stands which are arranged in a straight line to generate plastic deformation, and finally the metal blank is formed into the metal section with the target section. In order to maintain continuous material passing of the whole continuous rolling production line, the conventional rolling control system is generally provided with a basic automatic control unit, an initial speed cascade relation is established by collecting process parameters such as a reference rotating speed of a main transmission motor, roll reduction and the like, and a conventional loop position feedback or a simple tension closed-loop regulating circuit is used for assisting in ensuring continuous production of metal profiles by maintaining a basic running speed. However, when a metal member for an auto repair facility is continuously rolled by a plurality of stands, second flow balance and micro tension fluctuation between stands are core factors affecting rolling stability. Current rolling systems typically lack dynamic feed forward and real-time matching regulation mechanisms for the tension and mill speed differences between upstream and downstream stands, relying only on passive lag fine tuning. When the non-dynamic matching control strategy is subjected to disturbance such as initial non-uniformity of materials or equipment vibration, the phenomenon of metal accumulation or shrinkage between an upstream frame and a downstream frame is extremely easy to occur, so that the geometric dimension of a metal section is subjected to random variation, the produced metal section is subjected to wave-shaped distortion, and the yield of subsequent high-precision assembly of automobile maintenance equipment is seriously reduced. Disclosure of Invention The invention aims to provide a metal rolling dynamic matching regulation and control method for production of automobile maintenance equipment, which solves the problems in the background art: The aim of the invention can be achieved by the following technical scheme: a metal rolling dynamic matching regulation and control method for automobile maintenance equipment production comprises the following steps: s1, collecting temperature field distribution, geometric dimensions and sound waves/surface characteristics of a metal member at an input end of an upstream frame, and establishing an initial deformation resistance analysis model of the metal member; s2, fusing the initial deformation resistance analysis model with the current roller rotating speed of the upstream frame, calculating a dynamic forward slip coefficient in the rolling process, and generating a continuous second flow evolution track of the discharge end of the upstream frame according to the dynamic forward slip coefficient; S3, extracting fluctuation characteristic quantity in a second flow evolution track, and measuring and calculating micro-tension compound disturbance quantity between an upstream frame and a downstream frame by combining an actual micro-tension feedback value observed in real time; s4, converting the micro-tension compound disturbance quantity into a rotation speed compensation instruction, and constructing a dynamic matching adjustment matrix of the rotation speed difference of the upstream and downstream frames; s5, reconstructing a driving signal of the downstream rack according to the dynamic matching adjustment matrix, and generating a real-time driving current sequence of the downstream rack; S6, injecting a real-time driving current sequence into an executing motor of the downstream rack, driving rollers of the downstream rack to operate according to the reconstruction rotating speed, and realizing dynamic balance of second flow among the racks. In the step S1, the process of collecting the temperature field distribution, the geometric dimension and the sound wave/surface characteristics of the metal component at the input end of the upstream frame and establishing an initial deformation resistance analysis model of the metal component is as follows: scanning an upstream frame input end metal member by using