Pressure accuracy control method for isotemperature static pressing

Abstract

The invention discloses a pressure accuracy control method for isotemperature static pressing. A pressure control process of a pressure control system comprises segmentation control steps including pressurization segmentation control and pressure relief segmentation control. The pressure control process specifically comprises the following steps: (a) according to the pressurization segmentation control, first, a first-stage incremental algorithm is started for first-stage pressurization control, second, a second-stage PID follow control algorithm is started for second-stage pressurization control, and third, a third-stage PI proportional-integral algorithm is started for third-stage pressurization control; (b) according to the pressure relief segmentation control, a fuzzy algorithm is started, wherein first, a high pressure relief fuzzy control criterion table is selected for high pressure segment pressure relief control, and second, a low pressure relief fuzzy control criterion table is selected for low pressure segment pressure relief control. The pressure accuracy control method for isotemperature static pressing effectively realizes pressure accuracy control in the isotemperature static pressing near-net forming process, enables pressure control accuracy to be subjected to fine adjustment as a user required, is wide in application range, and lays a solid foundation for control over various pressure curves.

Description

technical field [0001] The invention belongs to the technical field of isostatic pressing, and in particular relates to a method for precise control of warm isostatic pressing. Background technique [0002] The maximum working temperature of the high-temperature and ultra-high-pressure warm isostatic press is 300°C and the maximum working pressure is 200MPa. The main working medium is heat transfer oil. Constants and other performance parameters all change, making it difficult to accurately establish a pressure control model, and the conventional low-pressure pressure control algorithm is simple and cannot be applied to high-pressure and high-temperature environments. [0003] On the other hand, the densification of powder materials is achieved by isostatic pressing. In order to achieve a better near-net shape of powder materials, it is usually required to precisely control the pressure during the pressure increase and release process, especially the slow change at high pres...

AI Technical Summary

Problems solved by technology

[0002] The maximum working temperature of the high-temperature and ultra-high-pressure warm isostatic press is 300°C and the maximum working pressure is 200MPa. The main working medium is heat transfer oil. Constants and other performance parameters all change, making it difficult to accurately establish a pressure control model, while the conventional low-pressure pressure control algorithm is simple and cannot be applied to high-pressure and high-temperature environments

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