Pressure accuracy control method for isotemperature static pressing

A pressure control and precise control technology, applied in the direction of presses, manufacturing tools, etc., can solve the problems of simple algorithm, difficult to accurately establish pressure control model, inability to apply to high pressure and high temperature environment, etc., and achieve the effect of wide application

Active Publication Date: 2014-03-19
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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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

Method used

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  • Pressure accuracy control method for isotemperature static pressing
  • Pressure accuracy control method for isotemperature static pressing
  • Pressure accuracy control method for isotemperature static pressing

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Embodiment Construction

[0034] Attached below Figure 1-Figure 11 And specific embodiment, the present invention is further elaborated and illustrated.

[0035] combined with figure 1 , attached figure 2 And embodiment, a warm isostatic pressure precise control method, the pressure control system mainly includes industrial control computer 3, boost control system, pressure relief control system, high pressure container 5 and pressure sensor 4, said boost control system includes Boost controller 1, boost proportional valve 101, oil supply pump 102, boost pump 103, and boost piston cylinder 104, the pressure relief control system includes pressure relief controller 2, pressure relief proportional valve 201, pressure relief valve 202. The pressure control process of the pressure control system is a segmented control step including booster segment control and pressure relief segmental control, and the booster segmental control includes at least the first-stage booster control, the second-stage booster...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B30B15/16B30B15/26
Inventor 曹志伟吕欣米玉华张程滔朱哲新蒋道建范玉德
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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