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Research Papers

Research on Constant Velocity Extruding Process Control for 36,000-Ton Vertical Extrusion Press

[+] Author and Article Information
Wanzhou Li

Professor
e-mail: lwz@tsinghua.edu.cn

Tao Sun

e-mail: t-sun10@mails.tsinghua.edu.cn

Yuechen Hu

e-mail: huyc08@mails.tsinghua.edu.cn

Wei Li

e-mail: liwei86621@163.com
Department of Automation,
Tsinghua University,
Beijing 100084, China

Contributed by the Dynamic Systems Division of ASME for publication in the Journal of Dynamic Systems, Measurement, and Control. Manuscript received July 8, 2012; final manuscript received February 21, 2013; published online May 17, 2013. Assoc. Editor: Won-jong Kim.

J. Dyn. Sys., Meas., Control 135(4), 041009 (May 17, 2013) (13 pages) Paper No: DS-12-1212; doi: 10.1115/1.4023895 History: Received July 08, 2012; Revised February 21, 2013

Metal extrusion is one of the most significant methods in the field of plastic deformation. The 36,000-ton vertical extrusion press uses one-piece hot extrusion molding method to produce high-pressure, large-diameter, thick-walled, seamless, alloy-steel pipe, which is required by ultrasupercritical power generator units and the third generation of nuclear power plants. The main table (extruding platform) is driven by 36,000-ton thrust. The extrusion process is a typical nonlinear multivariable strong-coupling finite-time system. In this paper, we analyze and solve the large-scaled engineering control problems, including (1) discussion of the mechanical structure of the controlled object and the feature of multivariable strongly coupling for large-scaled parallel-driving hydraulic system, (2) research on the engineering practical simplified control algorithm for multivariable system and propose a way to solve the coupling problem of the hydraulic system, and (3) design of double closed-loop control of velocity and pressure for the new technology of constant velocity extrusion. In our paper, we have proven through practice that the traditional proportional intergral (PI) controlling method, with proper controlling strategy, is still the most efficient and practicable way for a large-dimension complex object in industry.

Copyright © 2013 by ASME
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References

Figures

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Fig. 1

The 360-MN vertical extrusion press and the large-diameter thick-walled seamless tubes

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Fig. 2

The 360-MN extrusion press

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Fig. 3

The main cylinders and the extruding ram

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Fig. 4

The main table force diagram

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Fig. 5

The main pump groups

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Fig. 6

The hydraulic control system

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Fig. 7

Velocity control in the extrusion process

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Fig. 8

The little deflection, almost straight-extruded tubes, and the grinded tubes

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Fig. 9

Pressure control in the upsetting process

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Fig. 10

The effect of the upsetting control

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Fig. 11

Pressure control in the upsetting process

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Fig. 12

The balance error when kr = 0.98

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Fig. 13

The balance error when kr = 0.95

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Fig. 14

Extruded tubes with and without velocity control

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Fig. 15

Furnace No. 013527 extruded tubes (the lower five ones)

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Fig. 16

360-MN topological structure under consensus control

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Fig. 17

The Cosimulation of ADAMS and EASY5

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Fig. 18

Two eccentric resistance loads in ADAMS

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