Research on Mathematic Model and Measuring Method of Moving Beam Attitude in Large Forging Hydraulic Press

2011 ◽  
Vol 128-129 ◽  
pp. 1213-1216
Author(s):  
Hui Chen ◽  
Jian Ping Tan ◽  
Jin Li Gong ◽  
Xian Yue Cao ◽  
Ji Neng Zhou
Keyword(s):  
Research Result ◽  
Mathematic Model ◽  
Measuring Method ◽  
Hydraulic Press ◽  
Large Forging ◽  
Mechanical Feature ◽  
Object A ◽  
Moving Beam ◽  
Safety Operation ◽  
Special Working

The moving beam of large forging hydraulic press is taken as a research object. A mathematic model of moving beam’s six freedom degrees attitude is established. According to the mechanical feature and special working conditions of large forging hydraulic press, a non-contacted method for moving beam attitude measuring which based on machine vision is proposed. The basic principle and composition of the system are introduced. The system is applied in 300MN large forging hydraulic press, and large amounts of monitoring data are collected which confirm that the measuring method is effective. The research result is helpful for the safety operation and maintenance of large forging hydraulic press.

Design of New Condition Monitoring System and Data Analysis in Large Forging Die Hydraulic Press

2011 ◽  
Vol 311-313 ◽  
pp. 1546-1550
Author(s):  
Hui Chen ◽  
Jian Ping Tan ◽  
Jin Li Gong ◽  
Zhao Qiang Shu ◽  
Xian Yue Cao ◽  
...  
Keyword(s):  
Data Analysis ◽  
Monitoring System ◽  
Condition Monitoring ◽  
Working Conditions ◽  
Hydraulic Press ◽  
Contact Method ◽  
Large Forging ◽  
Monitoring Method ◽  
Condition Monitoring System ◽  
Safety Operation

The mechanical characteristics and extremely hard working conditions of large die hydraulic press are considered. The limitations of traditional condition monitoring method are analyzed. A new condition monitoring system which consists of a digital and non-contact method for measuring column stress and a digital method for measuring moving beam’s spatial altitude based on machine vision is proposed. The basic principle and composition of the system are introduced in detail. The system is applied in 300MN large forging hydraulic press, and large amounts of monitoring data are collected. Data analysis is carried out. The laws of column stress distribution in different working conditions are found out. At last, some recommendations are proposed which is helpful for the safety operation and maintenance of large hydraulic press.

Fault diagnosis of hydraulic system in large forging hydraulic press

Measurement ◽  
2014 ◽  
Vol 49 ◽  
pp. 390-396 ◽  
Author(s):  
Xian-bin Fu ◽  
Bin Liu ◽  
Yu-cun Zhang ◽  
Li-na Lian
Keyword(s):  
Fault Diagnosis ◽  
Hydraulic System ◽  
Hydraulic Press ◽  
Large Forging

Co-Simulation Research of the Balancing Control of the Moving Beam of a Heavy Hydraulic Press During the Die Forging Process

2017 ◽  
Author(s):  
Wenzhu Wang ◽  
Dong Du ◽  
Rendong Wu ◽  
Chaolong Yuan ◽  
Baohua Chang
Keyword(s):  
Control Process ◽  
Virtual Prototype ◽  
Hydraulic Press ◽  
Heavy Duty ◽  
Eccentric Load ◽  
Forging Process ◽  
Die Forging ◽  
Moving Beam ◽  
Synchronous Rectification ◽  
Balancing Control

A virtual prototype of the moving beam balancing system of a heavy-duty hydraulic press working under die forging function is built with Adams, AMESim and Simulink, and the balancing control process is analyzed using this prototype. The moving beam of the heavy-duty hydraulic press may tilt due to the eccentric load during the die forging processing, and thus affect the forging quality and the safety of the press. So it is necessary to research the beam balancing control process. Compared to the traditional methods based on simplified mathematical models, virtual prototype technology can obtain a co-simulation model, avoid tedious formula derivation and solving work, and save test time and cost. Based on the analysis of the working principle of balancing system, this paper establishes a dynamical model of the moving beam, a hydraulic circuit model of the single balancing system and a controller model using Adams, AMESim and Simulink, respectively. Then a virtual prototype is built using the three models via co-simulation interface files. The eccentric load signal is constructed in AMESim according to the variation of eccentric load during die forging process. By adjusting the controller parameters, the rapid balancing of the moving beam under eccentric load conditions is realized, and high precision of dynamic balancing and steady equilibrium is obtained. The simulation results show that the single balancing unit can achieve effective balancing of the moving beam, and the co-simulation analysis method based on the virtual prototype built with Adams, AMESim and Simulink is feasible in the research of the synchronous rectification of the moving beam. This work is a useful exploration in the research of synchronous rectification of moving beams.

Study on the Pretightening Assembly Moving Beam of Open-Die Forging Hydraulic Press

2011 ◽  
Vol 399-401 ◽  
pp. 1779-1784
Author(s):  
Rui Jie Gu ◽  
He Yang ◽  
Ying Jie Zhang ◽  
Zhi Yuan Fang ◽  
Yu Lin Fan ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Fe Simulation ◽  
Hydraulic Press ◽  
Simulation Software ◽  
Fe Model ◽  
Allowable Stress ◽  
Die Forging ◽  
Moving Beam ◽  
Open Die Forging ◽  
Computing Method

The FE model of the pretightening assembly moving beam of open-die forging hydraulic press is built with FE simulation software ABAQUS in the study. With the FE model, the force status of pretightening assembly moving beam is studied. Then the pretightening force of assembly moving beam is further studied and the computing method of pretightening force is given. The main achievements of the study include: Under pretightening, the stress of main moving beam is very low and that of guild sleeves is also lower than the allowable stress. Under center loading, the stress of the center field of main moving beam is higher and that of guild sleeves is almost same to that of pretightening. Under eccentric loading, the stress of same deviation field of main moving beam is higher and the effect of pretightening force on the stress of main moving beam is very small. The stress distribution of guild sleeves with different pretightening force is same and the effect of pretightening force on its strength is very low. The pretightening force of tension rod can be computed with the force of press, the allowable eccentric value of the workpiece, the distance between up guild section and down guild section of guild sleeve and the quantity of tension rods. The results of the study are very useful to design and install the pretightening assembly moving beam of open-die forging hydraulic press.

scholarly journals Study on Rub-Impact Dynamical Behavior of An Asymmetrical Rotor-Bearing with Variable Ratio of Stiffness

2015 ◽  
Vol 9 (1) ◽  
pp. 80-85
Author(s):  
Tan Lian ◽  
Dang Pei
Keyword(s):  
Dynamical Behavior ◽  
Mathematic Model ◽  
Variable Ratio ◽  
Bifurcation Diagrams ◽  
Low Frequencies ◽  
Generating Sets ◽  
Rotor Bearing ◽  
Exact Identification ◽  
Rotor Stiffness ◽  
Safety Operation

A rub-impact mathematic model of an Asymmetrical rotor-bearing with nonlinear oil film force is built in the paper. The bifurcation diagrams of the response were given following the changing of ratio of stiffness. We analyzed the bifurcation and the chaos character of an Asymmetrical rotor-bearing with operating rotor stiffness changing, then we get the dynamical character and the law when the rubbing happen. The nonlinear dynamic behaviors of the system were studied by using the numerical value integral and Poincare mapping methods. By analysis the process of rub-impact, it is so complex and many low frequencies with large amplitude are in the range of 0.3~0.6 X. The way of period-chaos-period and the phenomena of diverging backward whirl are discovered when the rubbing happen. These results provide important theoretical references for the safety operation of generating sets and the exact identification of the faults in rotating machinery.

The Design of the Giant Die Forging Hydraulic Press Synchronous Control System and its Dynamic Simulation

2012 ◽  
Vol 190-191 ◽  
pp. 836-841
Author(s):  
Zhong Wei Liu ◽  
Ying Jian Deng
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Sliding Mode ◽  
Mathematic Model ◽  
Hydraulic Press ◽  
National Defense ◽  
Beam Position ◽  
Synchronous Control ◽  
Die Forging ◽  
Short Period

The giant hydraulic press is the essential equipment of our country national defense and the infrastructure. The hydraulic synchronous control system is the important constituent of the hydraulic press, it is very important in improving the dimension accuracy of the product, ameliorating the force standing state of the die forging hydraulic press frame, extending the life of the die forging hydraulic press body and the moulds. To use 300 MN die forging hydraulic press’s synchronous control system for reference, according to a giant die forging hydraulic press its own characteristics, design the synchronization control system. Through the establishment of the mathematic model of the system, and choose the sliding mode-PID control strategy and simulation, the results show that :using PID sliding-mode control strategy of synchronous control system, the eccentric moment after stability, can over a short period of time after the stagnation, quickly will move back to level calibration beam position, get close to zero static deviation. But using the common sliding mode-PID can not overcome the disturbance bringing by the parameter perturbation, so the corresponding nonlinear and intelligent control strategy is particularly necessary.

Applied of RBF Neural Network in Pressure and Flow Control System

2015 ◽  
Vol 713-715 ◽  
pp. 909-914
Author(s):  
Fei Wang ◽  
Xiao Hua Sun ◽  
Zhi Jun Zou ◽  
Hao Li
Keyword(s):  
Neural Network ◽  
Flow Control ◽  
Control Method ◽  
Rbf Neural Network ◽  
Control Process ◽  
Mathematic Model ◽  
Pressure Control ◽  
Water Pipe ◽  
Object A ◽  
Pid Algorithm

This paper is addressed water pipe pressure control method, chose a water pipe with bypass valve as an object. The paper made the pressure and flow control of the object a mathematic model. This paper design a PID control algorithm which base on RBF neural network to control the pressure and flow of the object, and simulate the control process both RBF neural network PID algorithm and PID algorithm. The last part of the paper contrasts the two simulation result.

Water Hammer Characteristics of Glass Reinforced Plastic Oil Transportation Pipeline

2011 ◽  
Vol 204-210 ◽  
pp. 127-130 ◽  
Author(s):  
Chang Jun Li ◽  
Xia Wu ◽  
Wen Long Jia ◽  
Ke Xi Liao
Keyword(s):  
Pressure Fluctuation ◽  
Peak Pressure ◽  
Mathematic Model ◽  
Water Hammer ◽  
Steel Pipeline ◽  
Oil Transportation ◽  
Reinforced Plastic ◽  
Fluctuation Frequency ◽  
Simulation Results ◽  
Safety Operation

Glass reinforced plastic (GRP) pipeline has good characteristics of anti-corrosion, anti-scaling and it is widely used in the oil transportation pipeline. Analyze the water hammer characteristics of GRP pipeline is essential to ensure the safety operation of the pipeline. The water hammer mathematic model for GRP pipeline is built through combing the general water hammer mathematic model and prosperities of GRP pipeline. The solving method of the model is discussed based on the method of characteristic. Ultimately, the simulation results show the GRP pipeline can reduce the peak pressure and pressure fluctuation frequency as well as increase the low pressure caused by water hammer compared with steel pipeline. The GRP pipeline has a better capability to reduce the harms brought by water hammer than steel pipeline.

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