Method and device for fully closed-loop control of electric heating upsetting temperature

Abstract

The invention provides a method for full closed-loop controlling an electric upsetting temperature, wherein a highest temperature value allowed in an electric upsetting process is set in a temperature controller; when the electric upsetting temperature measured by a colorimetric infrared thermometer is less than a set temperature, an input signal of a power regulator is given by a microcomputer or other voltage giving devices; the heating in the electric upsetting process is not influenced by the temperature controller; when the electric upsetting temperature measured by the colorimetric infrared thermometer exceeds a set value of the temperature controller or the electric upsetting temperature rises too fast, the temperature controller performs control and mathematical operation according to a given cooling control manner and a set proportion integration differentiation (PID) parameter, and outputs a current signal to be overlaid on the power regulator; the phase of the current signal is opposite to the phase of an given signal of the microcomputer or the other voltage giving devices, and the current signal neutralizes a part of an input signal given to the power regulator by the microcomputer or the other voltage giving devices, namely cooling is performed, therefore the electric upsetting temperature is reduced or the rising speed of the electric upsetting temperature is slowed so as to achieve an aim that temperature is closed-loop controlled to limit the highest temperature.

Description

technical field [0001] The invention relates to the fields of electric heating upsetting technology and electric control technology, in particular to a method and device for controlling the temperature of electric heating upsetting by using a full-closed loop. Background technique [0002] There are two types of methods for controlling the workpiece heating temperature in the existing electrothermal upsetting process. The first is to control the heating temperature of the workpiece through parameters such as heating voltage or current and upsetting oil pressure during the entire heating process. The voltage or current and oil pressure have closed-loop control and open-loop control. The temperature control in the process is a kind of open-loop control of temperature, the control accuracy is low, and it is impossible to control the temperature in different periods of the heating process. The parameter matching of this control method is difficult to master, and the result is di...

AI Technical Summary

Problems solved by technology

The first is to control the heating temperature of the workpiece through parameters such as heating voltage or current and upsetting oil pressure during the entire heating process. The voltage or current and oil pressure have closed-loop control and open-loop control. The temperature control in the process is a kind of open-loop control of temperature, the control accuracy is low, and it is impossible to control the temperature in different periods of the heating process. The parameter matching of this control method is difficult to master, and the result is difficult to meet the needs of high-end products. Requirements for the quality of electric upsetting; the second is to introduce microcomputer technology on the basis of the first one, and perform open-loop or closed-loop control on parameters such as voltage and / or current and upsetting oil pressure during different periods of the heating process. The method is easier to master the matching of parameters, but the stability of the control is still not ideal, and the consistency of product quality often deteriorates due to changes in factors other than the control loop.

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