CN-122007199-A - Aluminum profile extrusion temperature control system and method

Abstract

The invention discloses a system and a method for controlling extrusion temperature of an aluminum profile, and belongs to the technical field of control engineering. The control system comprises an initial temperature sensor, a speed sensor, a pressure sensor, an outlet temperature sensor and a controller. The controller calls thermodynamic physical parameters corresponding to the current alloy grade, calculates extrusion heat generation based on the operation speed and the main cylinder pressure of the extruder, superimposes the initial temperature of the aluminum bar to be processed to obtain a theoretical predicted temperature, carries out cross verification fusion on the theoretical predicted temperature and the change trend of the actual temperature measurement reading to output a corrected actual outlet temperature, and finally dynamically generates a control instruction according to the corrected actual outlet temperature to adjust the operation speed of the extruder or the cooling parameters of the cooling device. According to the invention, through introducing cross verification of the estimated data and the test data, the high precision of production control is realized, the surface defect rate of the profile is reduced, and the product yield of the aluminum profile is improved.

Inventors

• PAN WEIJIN
• ZHANG JUN
• Mai Guocheng
• YUAN HAN

Assignees

• 江苏伟业铝材有限公司

Dates

Publication Date

20260512

Application Date

20260408

Claims (10)

1. 1. An aluminium alloy extrusion temperature control system for control extruder and cooling device, characterized in that, the control system includes: The initial temperature sensor is used for detecting the initial temperature of the aluminum bar to be processed; a speed sensor for detecting an operating speed of the extruder; a pressure sensor for detecting a master cylinder pressure of the extruder; the outlet temperature measurement sensor is used for acquiring actual temperature measurement readings at the outlet of the extruder; The controller is configured to receive or pre-store an alloy grade of a current processed aluminum profile, and is used for calling thermodynamic property parameters corresponding to the alloy grade, determining extrusion heat production based on the operation speed and the master cylinder pressure, superposing the initial temperature to obtain a theoretical prediction temperature, carrying out cross-validation fusion on the theoretical prediction temperature and the change trend of the actual temperature measurement reading to output a corrected actual outlet temperature, and dynamically generating a control instruction according to the corrected actual outlet temperature so as to adjust the operation speed of the extruder or the cooling parameters of the cooling device.
2. 2. The control system of claim 1, wherein the controller is configured to, when cross-verifying the trend of the theoretical predicted temperature and the actual thermometry reading, in particular: When the change rate of the actual temperature measurement reading exceeds a preset abnormal threshold value, reducing the weight of the actual temperature measurement reading in fusion calculation, and improving the weight of the theoretical predicted temperature; When the step-type abrupt change of the master cylinder pressure is detected, the change trend of the actual temperature measurement reading is preferentially adopted for temperature compensation.
3. 3. The control system of claim 1, wherein the controller, when dynamically generating control instructions based on the corrected actual outlet temperature, specifically employs a multi-stage cooling control strategy, comprising: When the corrected actual outlet temperature is greater than the set target temperature and is smaller than a first preset dangerous threshold value, a first control instruction for reducing the running speed is generated and sent to the extruder; and when the corrected actual outlet temperature is greater than or equal to the first preset dangerous threshold value and the current running speed of the extruder is detected to be reduced to the preset minimum running speed threshold value, generating a second control instruction for increasing the flow rate of the cooling medium and sending the second control instruction to the cooling device.
4. 4. The control system of claim 1, wherein the thermodynamic parameters include at least specific heat capacity, deformation resistance coefficient, and thermal conductivity corresponding to the alloy designation.
5. 5. The control system of claim 1, wherein the speed sensor is a displacement sensor or encoder disposed on the extruder ram, the pressure sensor is a pressure transmitter disposed on the extruder hydraulic fluid path, and the outlet temperature sensor is an infrared temperature sensor.
6. 6. The control system of claim 1, wherein the controller, when calculating the extrusion heat generation, is specifically configured to: Taking the product of the pressure of the main cylinder and the sectional area of the main cylinder of the extruder as extrusion thrust, taking the integral of the extrusion thrust and the running speed in the time dimension as extrusion working, and converting the extrusion working into the extrusion heat production according to the law of conservation of energy and a preset heat loss coefficient.
7. 7. The control system of claim 1, further comprising a physical memory communicatively coupled to the controller, the physical memory having an alloy property database stored therein, the database having recorded thermodynamic property parameters corresponding to different alloy grades; the controller is used for reading the alloy physical property database and extracting corresponding thermodynamic physical property parameters according to the alloy mark of the current processed aluminum profile as a calculation basis.
8. 8. An aluminum profile extrusion temperature control method applied to a control system for controlling an external extruder and a cooling device arranged at an outlet of the extruder, the method comprising: Receiving or pre-storing the alloy mark of the current processed aluminum profile; Detecting the initial temperature of an aluminum bar to be processed, the running speed of the extruder, the pressure of a main cylinder and the actual temperature measurement reading at the outlet of the extruder; Invoking thermodynamic physical parameters corresponding to the alloy grades, calculating extrusion heat production based on the running speed and the master cylinder pressure, and superposing the initial temperature to obtain a theoretical prediction temperature; cross-verifying and fusing the theoretical predicted temperature and the change trend of the actual temperature measurement reading to output a corrected actual outlet temperature; And dynamically generating a control instruction according to the corrected actual outlet temperature so as to adjust the running speed of the extruder or the cooling parameter of the cooling device.
9. 9. The method of claim 8, wherein the step of cross-verifying the trend of the theoretical predicted temperature and the actual thermometry reading comprises: When the change rate of the actual temperature measurement reading exceeds a preset abnormal threshold value, reducing the weight of the actual temperature measurement reading in fusion calculation, and improving the weight of the theoretical predicted temperature; When the step-type abrupt change of the master cylinder pressure is detected, the change trend of the actual temperature measurement reading is preferentially adopted for temperature compensation.
10. 10. The method of claim 8, wherein the step of dynamically generating control instructions based on the corrected actual outlet temperature employs a multi-stage cooling control strategy, comprising: When the corrected actual outlet temperature is greater than the set target temperature and is smaller than a first preset dangerous threshold value, a first control instruction for reducing the running speed is generated and sent to the extruder; and when the corrected actual outlet temperature is greater than or equal to the first preset dangerous threshold value and the current running speed of the extruder is detected to be reduced to the preset minimum running speed threshold value, generating a second control instruction for increasing the flow rate of the cooling medium and sending the second control instruction to the cooling device.

Description

Aluminum profile extrusion temperature control system and method Technical Field The invention belongs to the technical field of control engineering, and particularly relates to an aluminum profile extrusion temperature control system and method. Background In the extrusion molding process of the aluminum profile, the surface quality and mechanical properties of the aluminum profile are directly affected by the temperature of an extrusion outlet. In order to ensure product quality, it is often necessary to control the extrusion outlet temperature within a set process window. In the temperature control process, the system relies on an infrared thermometer arranged at the outlet of the extruder die to obtain the actual temperature, when the temperature is higher than a set value, the control system can reduce the running speed of the extruder to reduce friction heat generation, and when the temperature is lower than the set value, the running speed is increased. However, the control mode has the following problems in actual industrial production that because the time is required for heat in the extrusion barrel and the die to be conducted to the surface of the extrusion profile, when the temperature detector at the outlet detects that the temperature exceeds the standard, the aluminum material in the die is always overheated and damaged, and the hysteresis is extremely easy to cause the surface tearing and other defects of the profile. Cooling water is sprayed on the extrusion production site and is accompanied with smoke dust generated by volatilization of a release agent, and detection of an infrared thermometer is extremely easy to be shielded and interfered by the water mist and the smoke dust, so that the measured temperature data is subjected to severe jump or distortion. If the control system adjusts directly on these distorted false data, frequent false operations of the extruder can result. Therefore, the temperature in the extrusion molding process cannot be prejudged and accurately identified in advance in the prior art, and the running speed of the extruder and the cooling force of the cooling device cannot be effectively coordinated, so that the qualification rate and the production efficiency of the extruded product are difficult to be ensured simultaneously. Disclosure of Invention In view of the foregoing, it is an object of the present invention to provide a system and a method for controlling extrusion temperature of aluminum profiles, which at least partially solve the problems set forth in the background art. The technical scheme adopted by the invention is as follows: the first aspect of the present invention proposes an aluminum profile extrusion temperature control system for controlling an extruder and a cooling device, characterized in that the control system comprises: The initial temperature sensor is used for detecting the initial temperature of the aluminum bar to be processed; a speed sensor for detecting an operating speed of the extruder; a pressure sensor for detecting a master cylinder pressure of the extruder; the outlet temperature measurement sensor is used for acquiring actual temperature measurement readings at the outlet of the extruder; The controller is configured to receive or pre-store an alloy grade of a current processed aluminum profile, and is used for calling thermodynamic property parameters corresponding to the alloy grade, determining extrusion heat production based on the operation speed and the master cylinder pressure, superposing the initial temperature to obtain a theoretical prediction temperature, carrying out cross-validation fusion on the theoretical prediction temperature and the change trend of the actual temperature measurement reading to output a corrected actual outlet temperature, and dynamically generating a control instruction according to the corrected actual outlet temperature so as to adjust the operation speed of the extruder or the cooling parameters of the cooling device. In some embodiments of the present invention, the controller is specifically configured to perform the following operations when cross-verifying and fusing the theoretical predicted temperature with the trend of the actual thermometry readings: When the change rate of the actual temperature measurement reading exceeds a preset abnormal threshold value, reducing the weight of the actual temperature measurement reading in fusion calculation, and improving the weight of the theoretical predicted temperature; When the step-type abrupt change of the master cylinder pressure is detected, the change trend of the actual temperature measurement reading is preferentially adopted for temperature compensation. In some embodiments of the present invention, when the controller dynamically generates a control command according to the corrected actual outlet temperature, a multi-stage cooling control strategy is specifically adopted, including: When the corrected actual outlet temper