The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform

Chao Zhou - One of the best experts on this subject based on the ideXlab platform.

  • Construction of NonSinusoidal Oscillation Waveform Function and Technological Parameters for Continuous Casting Mold
    Complexity, 2020
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang
    Abstract:

    NonSinusoidal Oscillation techniques can shorten the negative strip time and improve the slab surface quality in the process of steel continuous casting. But the acceleration of nonSinusoidal Oscillation is higher than that of the Sinusoidal Oscillation. So it is easy to result in the impact for the mold movement. To solve this problem, a nonSinusoidal Oscillation waveform function of mold was constructed, which had good dynamic characteristics. And the smaller acceleration can reduce the impact of the oscillator. By analyzing the parameters of Oscillation technology, the calculation method of each Oscillation technological parameter for seven section functions was presented and the multitechnological parameter curves were given. Based on the technological parameters of Sinusoidal Oscillation, a synchronous control model of nonSinusoidal Oscillation was determined. The results show that the parameters can satisfy the limit value in theory, which can enhance the casting speed, surface quality of slab, and provide reference for further practice in industry.

  • Investigation of Non-Sinusoidal Oscillator Driven by Double Servomotors for Continuous Casting Mold
    IEEE Access, 2020
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang, Fuzeng Zhang
    Abstract:

    To improve the surface quality and casting speed of the slab further, a new type mold oscillator synchronously driven by double servomotors was proposed in this paper. The experimental prototype was designed and manufactured. For the non-Sinusoidal oscillator, the waveform modification ratio could be adjusted during the steel continuous casing operation. Firstly, the working principle of the oscillator was described. Secondly, the rotating rules of the servomotor to realize non-Sinusoidal Oscillation waveform for entire function were given. Finally, the laboratory experiments were made. The experiment results show that the error of the two-side Oscillation curves is smaller and the actual technological parameters are close to the theory and the oscillator can realize non-Sinusoidal Oscillation well. This kind of non-Sinusoidal oscillator provides a feasible scheme for reducing oscillator investment, increasing casting speed and enhancing slab quality.

  • mold oscillating system with optimized non Sinusoidal Oscillation profile
    Metallurgist, 2019
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang, Yiming Fang
    Abstract:

    A mold oscillating system for continuous casting machines has been developed based on a nonSinusoidal Oscillation profile with an online Oscillation control capability. A new type of the mold oscillating system is proposed comprising two servomotor-driven eccentric shafts. The principle of operation of a non-Sinusoidal Oscillation system is described. Based on the analysis of the non-Sinusoidal Oscillation waveform expressed as a piecewise linear function, the angular speed of a servomotor necessary to realize such Oscillations was determined. A procedure for calculating process parameters was developed. The model of synchronized control of the casting speed and Oscillation frequency was optimized and process parameters were calculated for the deviation factor of 20% and amplitude equal to 4 mm. The mold oscillating systems of Sinusoidal and non-Sinusoidal type were compared. The advantages of the non-Sinusoidal type of oscillating system were shown, which include a decrease in depth of the Oscillation marks on the surface of continuous-cast billet, an improvement in the mold-ingot lubrication conditions, and higher quality of continuous-cast billets.

  • mechanism analysis of non Sinusoidal Oscillation of continuous casting mold synchronously driven by double servomotors
    Journal of Iron and Steel Research International, 2017
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang, Yiming Fang
    Abstract:

    Due to the disadvantages of complexity, high maintenance and vast investment of the electro-hydraulic servo oscillator, a new mechanical device synchronously driven by double servomotors was proposed. The working principle of the non-Sinusoidal oscillator was analyzed and the model of the oscillator was validated via simulation software. Then, taking advantage of resonance technology, the hinging force and moment were calculated. The results showed that the hinging force and driving moment reduced, which was useful in reducing the impact of the hinge and prolonging the service life of the bearing. Besides, the best initial spring pressure was 0.9 times the mold gravity, which improved the Oscillation system stability and reduced the load fluctuation and servomotor driving power.

Xingzhong Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Construction of NonSinusoidal Oscillation Waveform Function and Technological Parameters for Continuous Casting Mold
    Complexity, 2020
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang
    Abstract:

    NonSinusoidal Oscillation techniques can shorten the negative strip time and improve the slab surface quality in the process of steel continuous casting. But the acceleration of nonSinusoidal Oscillation is higher than that of the Sinusoidal Oscillation. So it is easy to result in the impact for the mold movement. To solve this problem, a nonSinusoidal Oscillation waveform function of mold was constructed, which had good dynamic characteristics. And the smaller acceleration can reduce the impact of the oscillator. By analyzing the parameters of Oscillation technology, the calculation method of each Oscillation technological parameter for seven section functions was presented and the multitechnological parameter curves were given. Based on the technological parameters of Sinusoidal Oscillation, a synchronous control model of nonSinusoidal Oscillation was determined. The results show that the parameters can satisfy the limit value in theory, which can enhance the casting speed, surface quality of slab, and provide reference for further practice in industry.

  • Investigation of Non-Sinusoidal Oscillator Driven by Double Servomotors for Continuous Casting Mold
    IEEE Access, 2020
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang, Fuzeng Zhang
    Abstract:

    To improve the surface quality and casting speed of the slab further, a new type mold oscillator synchronously driven by double servomotors was proposed in this paper. The experimental prototype was designed and manufactured. For the non-Sinusoidal oscillator, the waveform modification ratio could be adjusted during the steel continuous casing operation. Firstly, the working principle of the oscillator was described. Secondly, the rotating rules of the servomotor to realize non-Sinusoidal Oscillation waveform for entire function were given. Finally, the laboratory experiments were made. The experiment results show that the error of the two-side Oscillation curves is smaller and the actual technological parameters are close to the theory and the oscillator can realize non-Sinusoidal Oscillation well. This kind of non-Sinusoidal oscillator provides a feasible scheme for reducing oscillator investment, increasing casting speed and enhancing slab quality.

  • mold oscillating system with optimized non Sinusoidal Oscillation profile
    Metallurgist, 2019
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang, Yiming Fang
    Abstract:

    A mold oscillating system for continuous casting machines has been developed based on a nonSinusoidal Oscillation profile with an online Oscillation control capability. A new type of the mold oscillating system is proposed comprising two servomotor-driven eccentric shafts. The principle of operation of a non-Sinusoidal Oscillation system is described. Based on the analysis of the non-Sinusoidal Oscillation waveform expressed as a piecewise linear function, the angular speed of a servomotor necessary to realize such Oscillations was determined. A procedure for calculating process parameters was developed. The model of synchronized control of the casting speed and Oscillation frequency was optimized and process parameters were calculated for the deviation factor of 20% and amplitude equal to 4 mm. The mold oscillating systems of Sinusoidal and non-Sinusoidal type were compared. The advantages of the non-Sinusoidal type of oscillating system were shown, which include a decrease in depth of the Oscillation marks on the surface of continuous-cast billet, an improvement in the mold-ingot lubrication conditions, and higher quality of continuous-cast billets.

  • mechanism analysis of non Sinusoidal Oscillation of continuous casting mold synchronously driven by double servomotors
    Journal of Iron and Steel Research International, 2017
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang, Yiming Fang
    Abstract:

    Due to the disadvantages of complexity, high maintenance and vast investment of the electro-hydraulic servo oscillator, a new mechanical device synchronously driven by double servomotors was proposed. The working principle of the non-Sinusoidal oscillator was analyzed and the model of the oscillator was validated via simulation software. Then, taking advantage of resonance technology, the hinging force and moment were calculated. The results showed that the hinging force and driving moment reduced, which was useful in reducing the impact of the hinge and prolonging the service life of the bearing. Besides, the best initial spring pressure was 0.9 times the mold gravity, which improved the Oscillation system stability and reduced the load fluctuation and servomotor driving power.

  • investigation and application of non Sinusoidal Oscillation technique of mold
    Journal of Iron and Steel Research International, 2013
    Co-Authors: Xingzhong Zhang, Xueran Zheng, L I Xiankui, Yiming Fang
    Abstract:

    To improve the slab quality, a kind of non-Sinusoidal Oscillation technique of mold driven by elliptic gears was developed. The waveform functions of non-Sinusoidal Oscillation were determined, and the calculation method and curves of technological parameters for non-Sinusoidal Oscillation were given. At the case of waveform deviation factor α equal to 0. 31 and Oscillation amplitude h equal to ±2.7 mm, the relationship between Oscillation frequency and casting speed is determined, and the technological parameters for non-Sinusoidal Oscillation are calculated. The testing results of industrial application indicated that this technique could not only improve the slab surface quality, but also reduce the steel breakout.

Fang Wang - One of the best experts on this subject based on the ideXlab platform.

  • Construction of NonSinusoidal Oscillation Waveform Function and Technological Parameters for Continuous Casting Mold
    Complexity, 2020
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang
    Abstract:

    NonSinusoidal Oscillation techniques can shorten the negative strip time and improve the slab surface quality in the process of steel continuous casting. But the acceleration of nonSinusoidal Oscillation is higher than that of the Sinusoidal Oscillation. So it is easy to result in the impact for the mold movement. To solve this problem, a nonSinusoidal Oscillation waveform function of mold was constructed, which had good dynamic characteristics. And the smaller acceleration can reduce the impact of the oscillator. By analyzing the parameters of Oscillation technology, the calculation method of each Oscillation technological parameter for seven section functions was presented and the multitechnological parameter curves were given. Based on the technological parameters of Sinusoidal Oscillation, a synchronous control model of nonSinusoidal Oscillation was determined. The results show that the parameters can satisfy the limit value in theory, which can enhance the casting speed, surface quality of slab, and provide reference for further practice in industry.

  • Investigation of Non-Sinusoidal Oscillator Driven by Double Servomotors for Continuous Casting Mold
    IEEE Access, 2020
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang, Fuzeng Zhang
    Abstract:

    To improve the surface quality and casting speed of the slab further, a new type mold oscillator synchronously driven by double servomotors was proposed in this paper. The experimental prototype was designed and manufactured. For the non-Sinusoidal oscillator, the waveform modification ratio could be adjusted during the steel continuous casing operation. Firstly, the working principle of the oscillator was described. Secondly, the rotating rules of the servomotor to realize non-Sinusoidal Oscillation waveform for entire function were given. Finally, the laboratory experiments were made. The experiment results show that the error of the two-side Oscillation curves is smaller and the actual technological parameters are close to the theory and the oscillator can realize non-Sinusoidal Oscillation well. This kind of non-Sinusoidal oscillator provides a feasible scheme for reducing oscillator investment, increasing casting speed and enhancing slab quality.

  • mold oscillating system with optimized non Sinusoidal Oscillation profile
    Metallurgist, 2019
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang, Yiming Fang
    Abstract:

    A mold oscillating system for continuous casting machines has been developed based on a nonSinusoidal Oscillation profile with an online Oscillation control capability. A new type of the mold oscillating system is proposed comprising two servomotor-driven eccentric shafts. The principle of operation of a non-Sinusoidal Oscillation system is described. Based on the analysis of the non-Sinusoidal Oscillation waveform expressed as a piecewise linear function, the angular speed of a servomotor necessary to realize such Oscillations was determined. A procedure for calculating process parameters was developed. The model of synchronized control of the casting speed and Oscillation frequency was optimized and process parameters were calculated for the deviation factor of 20% and amplitude equal to 4 mm. The mold oscillating systems of Sinusoidal and non-Sinusoidal type were compared. The advantages of the non-Sinusoidal type of oscillating system were shown, which include a decrease in depth of the Oscillation marks on the surface of continuous-cast billet, an improvement in the mold-ingot lubrication conditions, and higher quality of continuous-cast billets.

  • mechanism analysis of non Sinusoidal Oscillation of continuous casting mold synchronously driven by double servomotors
    Journal of Iron and Steel Research International, 2017
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang, Yiming Fang
    Abstract:

    Due to the disadvantages of complexity, high maintenance and vast investment of the electro-hydraulic servo oscillator, a new mechanical device synchronously driven by double servomotors was proposed. The working principle of the non-Sinusoidal oscillator was analyzed and the model of the oscillator was validated via simulation software. Then, taking advantage of resonance technology, the hinging force and moment were calculated. The results showed that the hinging force and driving moment reduced, which was useful in reducing the impact of the hinge and prolonging the service life of the bearing. Besides, the best initial spring pressure was 0.9 times the mold gravity, which improved the Oscillation system stability and reduced the load fluctuation and servomotor driving power.

Yiming Fang - One of the best experts on this subject based on the ideXlab platform.

  • mold oscillating system with optimized non Sinusoidal Oscillation profile
    Metallurgist, 2019
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang, Yiming Fang
    Abstract:

    A mold oscillating system for continuous casting machines has been developed based on a nonSinusoidal Oscillation profile with an online Oscillation control capability. A new type of the mold oscillating system is proposed comprising two servomotor-driven eccentric shafts. The principle of operation of a non-Sinusoidal Oscillation system is described. Based on the analysis of the non-Sinusoidal Oscillation waveform expressed as a piecewise linear function, the angular speed of a servomotor necessary to realize such Oscillations was determined. A procedure for calculating process parameters was developed. The model of synchronized control of the casting speed and Oscillation frequency was optimized and process parameters were calculated for the deviation factor of 20% and amplitude equal to 4 mm. The mold oscillating systems of Sinusoidal and non-Sinusoidal type were compared. The advantages of the non-Sinusoidal type of oscillating system were shown, which include a decrease in depth of the Oscillation marks on the surface of continuous-cast billet, an improvement in the mold-ingot lubrication conditions, and higher quality of continuous-cast billets.

  • mechanism analysis of non Sinusoidal Oscillation of continuous casting mold synchronously driven by double servomotors
    Journal of Iron and Steel Research International, 2017
    Co-Authors: Chao Zhou, Xingzhong Zhang, Fang Wang, Yiming Fang
    Abstract:

    Due to the disadvantages of complexity, high maintenance and vast investment of the electro-hydraulic servo oscillator, a new mechanical device synchronously driven by double servomotors was proposed. The working principle of the non-Sinusoidal oscillator was analyzed and the model of the oscillator was validated via simulation software. Then, taking advantage of resonance technology, the hinging force and moment were calculated. The results showed that the hinging force and driving moment reduced, which was useful in reducing the impact of the hinge and prolonging the service life of the bearing. Besides, the best initial spring pressure was 0.9 times the mold gravity, which improved the Oscillation system stability and reduced the load fluctuation and servomotor driving power.

  • motion stability analysis of non Sinusoidal Oscillation of mold driven by servomotor
    Chinese Journal of Mechanical Engineering, 2015
    Co-Authors: Junxia Li, Yiming Fang
    Abstract:

    The investments of the electro-hydraulic servo system of the mold non-Sinusoidal oscillator are great, the modification ratio of the mechanical type is unable to be adjusted online, and some continuous casters suffer from server resonance during the casting. A mold non-Sinusoidal Oscillation mechanism driven by servomotor is proposed and the prototype is produced in the lab, the investment is low and the modification ratio is can be adjusted online, and the stability problem is studied. At first the dynamics model of the servomotor non-Sinusoidal Oscillation is established, and the kinematics differential function is deduced. Furthermore, based on the harmonic balance method, the eigenvalues of the system are solved; the criterion of the stability of the system is put forward. In addition, the eigenvalues and harmonic with different oscillating parameters are analyzed. Analytical results show that the real parts of the eigenvalues are positive, the system will be unstable, and the resonance will occur when the positive real parts of the eigenvalues are extremum. A foundation is established for solving the running smooth problem and next application of this mechanism.

  • investigation and application of non Sinusoidal Oscillation technique of mold
    Journal of Iron and Steel Research International, 2013
    Co-Authors: Xingzhong Zhang, Xueran Zheng, L I Xiankui, Yiming Fang
    Abstract:

    To improve the slab quality, a kind of non-Sinusoidal Oscillation technique of mold driven by elliptic gears was developed. The waveform functions of non-Sinusoidal Oscillation were determined, and the calculation method and curves of technological parameters for non-Sinusoidal Oscillation were given. At the case of waveform deviation factor α equal to 0. 31 and Oscillation amplitude h equal to ±2.7 mm, the relationship between Oscillation frequency and casting speed is determined, and the technological parameters for non-Sinusoidal Oscillation are calculated. The testing results of industrial application indicated that this technique could not only improve the slab surface quality, but also reduce the steel breakout.

  • Fuzzy PID control of mould non-Sinusoidal oscillator driven by permanent magnet synchronous motor
    International Journal of Modelling Identification and Control, 2010
    Co-Authors: Xian Kui Li, Xingzhong Zhang, Junxia Li, Yiming Fang
    Abstract:

    Mould non-Sinusoidal Oscillation is one of the key techniques to development of the high efficiency continuous casting and the mould non-Sinusoidal oscillator is the pivotal mechanism. A mold non-Sinusoidal Oscillation mechanism, which is driven by a field-oriented control permanent magnet synchronous motor (PMSM), with fuzzy PID control proposed in this study. The machine design of the mold Oscillation servo-mechanism is developed. The rod and four bar-linkage of the mould Oscillation mechanism are assumed to be rigid and the kinematic analysis of this mechanism is introduced. A fuzzy PID controller is designed to control the angular speed of the PMSM, the performance of the proposed controller is verified by simulation experiments.

Xiang Ning Meng - One of the best experts on this subject based on the ideXlab platform.

  • Mechanism of explaining liquid friction and flux consumption during non‐Sinusoidal Oscillation in slab continuous casting mould
    Canadian Metallurgical Quarterly, 2020
    Co-Authors: Xiang Ning Meng
    Abstract:

    AbstractThe mechanism of explaining liquid friction and flux consumption in a non‐Sinusoidal Oscillation mould is expounded by proposing a series of indices for estimating interface phenomena between mould and metal in meniscus and calculating the effect of non‐Sinusoidal Oscillation parameters on these indices. The results show that the liquid flux is periodically infiltrated into the gap between oscillating mould and withdrawing slab by the negative pressure caused by widening flux channel from the last stage of positive strip time to the last stage of negative strip time. The surface cracks on the slab, even breakout, are formed during the positive strip time and existing surface cracks can be healed within the cumulative negative strip time. The casting performances were improved by decreasing Oscillation frequency and increasing amplitude and non‐Sinusoidal Oscillation factor.On explique la friction liquide et la consommation de flux dans une coquille a Oscillation non‐Sinusoidale en proposant une se...

  • hydrodynamic lubrication during non Sinusoidal Oscillation for a continuous casting mould
    Materials Science Forum, 2014
    Co-Authors: Jie Yang, Xiang Ning Meng
    Abstract:

    A hydrodynamic lubrication model of a flux channel was established for a continuous casting mould with non-Sinusoidal Oscillation. A new experimental apparatus was developed simultaneously for analysing the lubrication mechanism. A mixed oil, which was simulated mould flux, was poured and infiltrated into the channel, and the flux consumption was determined in the process of Oscillation. Based on the combination of analytical calculation and cold model experiment, the flux channel is divided into two parts to clarify the behaviours of flux infiltration and shell deformation. The results show that Oscillation marks and surface cracks are formed at the bottom of the meniscus during the negative and positive strip time respectively. Meanwhile, the liquid flux is periodically infiltrated into the channel by negative pressure below the meniscus because the cyclic movement of the shell lags behind the mould Oscillation. The casting performances were improved by increasing the non-Sinusoidal Oscillation factor.

  • mechanism of explaining liquid friction and flux consumption during non Sinusoidal Oscillation in slab continuous casting mould
    Canadian Metallurgical Quarterly, 2011
    Co-Authors: Xiang Ning Meng
    Abstract:

    AbstractThe mechanism of explaining liquid friction and flux consumption in a non‐Sinusoidal Oscillation mould is expounded by proposing a series of indices for estimating interface phenomena between mould and metal in meniscus and calculating the effect of non‐Sinusoidal Oscillation parameters on these indices. The results show that the liquid flux is periodically infiltrated into the gap between oscillating mould and withdrawing slab by the negative pressure caused by widening flux channel from the last stage of positive strip time to the last stage of negative strip time. The surface cracks on the slab, even breakout, are formed during the positive strip time and existing surface cracks can be healed within the cumulative negative strip time. The casting performances were improved by decreasing Oscillation frequency and increasing amplitude and non‐Sinusoidal Oscillation factor.On explique la friction liquide et la consommation de flux dans une coquille a Oscillation non‐Sinusoidale en proposant une se...