Temperature uniformity control system for multi-temperature zone of large plate vacuum annealing furnace and control method thereof

Abstract

The invention discloses a temperature uniformity control system for a multi-temperature zone of a large-plate vacuum annealing furnace and a control method thereof. The control system comprises a plurality of temperature controllers, a plurality of power regulators, a uniform temperature data logging device and an upper computer monitoring system, wherein the upper computer monitoring system is used for analyzing detection signals of the uniform temperature data logging device and monitoring the working process of each temperature controller and each power regulator. The control method comprises the following steps of: (1) initiating data; (2) working out the absolute value of the temperature difference e(n) and the absolute value of the temperature difference change rate ec(n); (3) setting control parameters required to be used by a PID (Proportion Integration Differentiation) controller on line by using a fuzzy reasoning method; (4) automatically setting the PID parameters; (5) controlling the heating of the vacuum annealing furnace; (6) detecting the temperature uniformity of the multi-temperature zone; and (7) analyzing and locally adjusting the temperature uniformity of the multi-temperature zone. The control system has the advantages of high temperature control accuracy, good temperature uniformity, high reliability and good adaptivity and robustness, the production process requirements of the rare metal vacuum annealing furnace can be well satisfied, and the control system is convenient for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and in particular relates to a multi-temperature zone temperature uniformity control system and a control method of a large plate vacuum annealing furnace. Background technique [0002] In recent years, rare metal sheets have been widely used in aerospace, navigation, nuclear power, petrochemical and other fields, and these industries have extremely high requirements on the technical performance of rare metal sheets. The requirements are very strict. Vacuum annealing is an important process for the production of rare metal sheets. Stress relief or recrystallization annealing is performed in a non-oxidizing and pollution-free state to eliminate work hardening and restore plasticity. Different vacuum states and temperatures will have completely different effects on the material. This is a precise and complicated process, so there are strict requirements on the uniformity of the temperatu...

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Problems solved by technology

Different vacuum states and temperatures will have completely different effects on the material. This is a precise and complex process, so there are strict requirements on the uniformity of the temperature of the annealing furnace and the degree of vacuum. However, currently domestic self-developed production is rare. Vacuum annealing furnaces for metal sheets, especially large-scale sheet vacuum annealing furnaces with large furnace chambers, have low temperature control accuracy and low temperature control accuracy due to multiple heating temperature zones, inconsistent detection and control, and imperfect control technology and control methods. It is difficult to adapt to the application research and development of the rare metal plate industry due to poor temperature resistance

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