Time filter

Source Type

Yu X.-D.,Harbin University of Science and Technology | Wu B.,Harbin University of Science and Technology | Shao J.-P.,Harbin University of Science and Technology | Zhang Y.-Q.,Harbin University of Science and Technology | Shi Z.-M.,Qiqihar Heavy CNC Equipment Corporation Ltd.
Key Engineering Materials | Year: 2010

In order to solve the thermal deformation of the hydrostatic thrust bearing in the heavy equipment, a simulation research concerning temperature field of multi-pad hydrostatic thrust bearing having circular cavities was described. The Finite Volume Method of Fluent has been used to compute three-dimensional temperature field of gap fluid between the rotation worktable and base. This study theoretically analyzes the influence of cavity radius and cavity depth on the bearing temperature performance according to computational fluid dynamics and lubricating theory. It has revealed its temperature distribution law. The simulation results indicate that an improved characteristic can be gotten from a circular cavity hydrostatic thrust bearing, oil cavity temperature decreases by gradually with cavity radius enhancing, oil cavity temperature decreases by gradually with cavity depth. Through this method, the safety of a hydrostatic thrust bearing having circular cavities multi-pad can be forecasted, and the optimal design of such products can be achieved, so it can provide reasonable data for design and lubrication and experience and thermal deformation computation for hydrostatic thrust bearing in the heavy equipment.


Wu B.,Harbin University of Science and Technology | Huang Z.,Harbin University of Science and Technology | Yu X.D.,Harbin University of Science and Technology | Jiang H.,Qiqihar Heavy CNC Equipment Corporation | Wang C.Z.,Qiqihar Heavy CNC Equipment Corporation
Applied Mechanics and Materials | Year: 2014

In order to increase load capacity of a heavy constant flow hydrostatic center rest, a theoretical study concerning the lubrication performance of the heavy constant flow hydrostatic center rest is described. The Computational Fluid Dynamics and the Finite Volume Method have been used to compute lubrication characteristics, such as the recess pressure and the oil flow state. The influences of oil-returning slot on the load capacity of the heavy constant flow hydrostatic center rest was analyzed based on the computational fluid dynamics and lubrication theory, and the influencing laws were revealed. Through this method, the reasonable data can be provided for optimal design and lubrication performance improving of the constant flow hydrostatic center rest in the heavy equipment. © (2014) Trans Tech Publications, Switzerland.


Han D.D.,Harbin Institute of Technology | Zhao S.J.,Harbin Institute of Technology | Jiang H.,Qiqihar Heavy CNC Equipment Corporation Ltd | Fu H.Y.,Harbin Institute of Technology
Applied Mechanics and Materials | Year: 2013

Form grinding is one of the most efficient processes for finish machining of gear wheels. This paper investigates the method of system development for wheel modification of involute cylindrical gear based on SINUMERIK 840D system and its OEM development package. The control software developed for form grinding is applied to dress form grinding wheel by using the numerical control dresser, and normal projection is adopted as the method to calculate the sectional shape of grinding wheel. The friendly interface of control software, edited by Visual Basic was developed to meet needs of users. Finally, personalized interface and processing methods are integrated and embedded in Siemens CNC system through Dynamic Link Library to implement parameterized automatic processing, which is more efficient in programming and machining. © (2013) Trans Tech Publications, Switzerland.


Zhang Y.,Harbin University of Science and Technology | Yu X.,Harbin University of Science and Technology | Yang X.,Harbin University of Science and Technology | Sun G.,Harbin University of Science and Technology | And 2 more authors.
Key Engineering Materials | Year: 2011

Lubricant viscosity is one of the key parameters in hydrostatic bearing research. In order to solve the load capacity of hydrostatic bearing in the heavy equipment, viscosity-temperature equation of lubricant film is established, and the viscosity-temperature curve is fitted by B-Spline curve. Finite volume method is used on numerical simulation of pressure field of heavy hydrostatic bearing in constant and variable viscosity respectively and in different rotational velocity, whereafter, viscosity influence on load capacity of heavy hydrostatic bearing is discussed. The results show that, viscosity impose a minor influence on cavity pressure of hydrostatic bearing when rational velocity is low; whereas, when rational velocity is high, especially to the heavy hydrostatic bearing which with high liner velocity influence of viscosity changing must be taken into account in calculation. Numerical simulation results reflect the pressure distributing state of bearing veritably; furthermore, these provide theoretical basis for hydrostatic bearing design and lectotype in practical application.


Wu B.,Harbin University of Science and Technology | Yu X.,Harbin University of Science and Technology | Chang X.,Qiqihar Heavy CNC Equipment Corporation | Yin C.,Harbin University of Science and Technology
Applied Mechanics and Materials | Year: 2013

In order to increase the working performance of a heavy constant flow hydrostatic center rest, a theoretical study concerning the lubricating oil film dynamic pressure effect of the heavy constant flow hydrostatic center rest is described. The Computational Fluid Dynamics and the Finite Volume Method have been used to compute numerically the static pressure field and the total pressure field of the lubricating oil film. The influences of spindle rotating rate, lubricating oil dynamic viscosity and inlet flow rate on the lubricating oil film dynamic pressure effect of the heavy constant flow hydrostatic center rest were analyzed based on the computational fluid dynamics and lubrication theory, and the influencing laws were revealed. By means of this method, the reasonable data can be provided for reasonably controlling dynamic pressure and structure optimal design of the heavy constant flow hydrostatic center rest. © (2013) Trans Tech Publications, Switzerland.


Qin B.,Harbin University of Science and Technology | Zhang B.,Harbin University of Science and Technology | Ni Y.,Qiqihar Heavy CNC Equipment Corporation Ltd | Han G.,Harbin University of Science and Technology | And 2 more authors.
Advanced Science Letters | Year: 2011

Dynamical vibration absorption technique is adopted to increase the dynamic stiffness of a lathe tool with large length to diameter ratio. According to dynamical vibration absorption construction and tail clamp form of lathe tool, multi flexible body dynamical model of the vibration absorption system is built up by using the software of ADAMS and ANSYS. And the amplitude-frequency characteristic of a lathe tool is obtained by simulation. The actual amplitude-frequency characteristic of a lathe tool is analyzed by using SA-78 2ch FFT analyzer. Through the analysis of simulation results and experimental data, the accuracy of the model is validated. Aiming at reducing the peak value of frequency response, the vibration absorption system has been simulated, optimized and analyzed, and the result of study demonstrates that the anti-vibration property of the system is improved greatly. Based on the optimization of system, it is discussed that the influence of the dimensions of vibration absorption cavity and the mass center position of mass block on the vibration absorption performance of lathe tool. This offers the design considerations about the structure of the lathe tool with large length to diameter ratio. © 2011 American Scientific Publishers All rights reserved.


Zhang Y.,Harbin University of Science and Technology | Yang X.,Harbin University of Science and Technology | Li H.,China Academy of Railway Sciences | Jiang H.,Qiqihar Heavy CNC Equipment Corporation Ltd. | And 2 more authors.
Advanced Materials Research | Year: 2010

Owing to setting viscosity of lubrication oil as a constant value will lead errors in hydrostatic bearing calculation, the influence of cavity depth on load capacity of heavy static bearing is analyzed in variable viscosity condition. Firstly, viscosity-temperature equations of oil film are established; secondly, viscosity-temperature curve is fitted by B-Spline; finally, using finite volume method, hydrostatic pressure field and dynamic pressure field of heavy hydrostatic bearing is calculated with different cavity depth at the same velocity, and influence of cavity depth on load capacity is revealed. The results show that, were the cavity depth shallow enough(≤2mm), hydrostatic pressure and dynamic pressure of cavity would decline rapidly with the cavity depth increasing; whereas, were cavity deep enough(≥2mm), hydrostatic pressure and dynamic pressure of cavity would change little with the cavity depth extending. This numerical simulation reflects real distribution of bearing pressure appropriately, and provides a theoretical basis for hydrostatic bearing design and lectotype. © (2010) Trans Tech Publications.


Wang Y.P.,Harbin University of Science and Technology | Gao L.,Harbin University of Science and Technology | Shi Z.M.,Qiqihar Heavy CNC Equipment Corporation LTD. | Bi K.X.,Harbin University of Science and Technology | Ge J.H.,Harbin University of Science and Technology
International Journal of Smart Home | Year: 2014

Enterprises to achieve global optimization and better diversification and personalized product production scheduling, from the unity of the tasks and resources manufacturing, based on the perspective of global optimization in production scheduling method. With global production scheduling of matching and process model resources as the foundation for the realization of enterprise process production scheduling optimization and level continue working process decoupling point, this paper manufacturing task and manufacturing process is divided into generalization and differential theory , applications from manufacturing process optimization results obtained path, based on the manufacturing process optimization mathematical model to study the production scheduling, and by using the improved genetic algorithm, and finally for example. Above scheduling method simplified the scheduling process, reduce the scheduling of difficulty, shorten the time scheduling, and finally achieve enterprise resource efficient use. © 2014 SERSC.


Zhang J.-Y.,Harbin University of Science and Technology | Shi X.-Y.,Petrochina | Han G.-H.,Harbin University of Science and Technology | Han G.-H.,Qiqihar Heavy CNC Equipment Corporation LTD
International Journal of Smart Home | Year: 2014

The idea of the hydrostatic thrust bearing pose control was presented to improve NC machine tool precision. The bearing worktable poses by controlled by coupling oil film thickness of 4 controllable chambers. The chamber flow can be regulated by variable pump. The flow of the variable pump was controlled by electro hydraulic servo valve according to the surface roughness, load, cutting force, and thermal effects of worktable. The mathematical models of the controllable chamber flow. The pose control model was established, which contains the kinematics positive and negative solution. The simulation experiment was carried out on the electro hydraulic servo test bench. The experiment results show that the model of hydrostatic thrust bearing pose is reasonable and control scheme is effective. © 2014 SERSC.


Zhang Y.,Qiqihar Heavy CNC Equipment Corporation Ltd. | Dai C.,Harbin University of Science and Technology | Wang Y.,Harbin University of Science and Technology | Wu B.,Harbin University of Science and Technology | And 2 more authors.
Proceedings of 2011 International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2011 | Year: 2011

Carrying capacity of heavy hydrostatic bearing is one of important indicators reflecting its performance. Aiming at the problem of influence of oil cavity shapes on carrying capacity of heavy hydrostatic bearing, use finite volume method to simulate gap film pressure field of heavy hydrostatic bearing with rectangular-shaped, sector-shaped, oval-shaped, and I-shaped cavity and study pressure field distribution law of four cavity shapes on the conditions of the same rotating speed, cavity depth and oil cavity area, then optimize oil cavity structure. Results show that pressure field distribution law of four cavity shapes is basically identical, but four kinds of cavities possess different carrying capacity which is respectively arranged as oval-shaped, sector shaped rectangular-shaped, and I-shaped cavity according to size. Simulation results and theoretical analysis are proved to have consistency, which provide valuable theoretical basis for selecting cavity shapes for heavy hydrostatic bearing in practical productions. © 2011 IEEE.

Loading Qiqihar Heavy CNC Equipment Corporation Ltd collaborators
Loading Qiqihar Heavy CNC Equipment Corporation Ltd collaborators