The Research of the Assembly Precision of CNC Machine Tools Considering the Joint Surface Characteristics

2013 ◽  
Vol 397-400 ◽  
pp. 198-201
Author(s):  
Wan Yu Li ◽  
Cong Lu ◽  
Zhuo Yang
Keyword(s):  
Machine Tools ◽  
Surface Deformation ◽  
Surface Characteristics ◽  
Cnc Machine Tools ◽  
Joint Surface ◽  
Surface Model ◽  
Assembly Sequence ◽  
Cnc Machine ◽  
Element Analysis ◽  
Assembly Precision

In order to evaluate the assembly precision of the CNC machine tools influenced by the joint surface characteristics effectively, a method is proposed in this paper. Finite element analysis is used to obtain joint surface deformation data, and then a second-order response surface model is established as a surrogate model to express the function of joint surface static characteristics and deformation. The error propagation in assembly sequence is obtained, so that the assembly precision of CNC machine tools can be evaluated effectively.

Research on Assembly Precision of CNC Machine Tools Considering Characteristic Parameters of Glued Joint

2012 ◽  
Vol 220-223 ◽  
pp. 377-380
Author(s):  
Song Ling Wang ◽  
Cong Lu ◽  
Ling Gou
Keyword(s):  
Machine Tools ◽  
Cnc Machine Tools ◽  
Assembly Sequence ◽  
Cnc Machine ◽  
Characteristic Parameters ◽  
Evaluation Approach ◽  
Design Tolerance ◽  
Assembly Sequences ◽  
Bp Neural Network Model ◽  
Assembly Precision

In order to evaluate the assembly precision of the CNC machine tools in different assembly sequences more accurately and effectively, this paper proposes a new assembly sequence deviation model and quality evaluation approach considering characteristic parameters of glued joint. A BP neural network model is established for predicting characteristic parameters of glued joint in each assembly step. The method is able to obtain the assembly sequence with best assembly quality and improve the design tolerance of parts.

Research on Machining Method of Complex Surface Face Gears

2012 ◽  
Vol 163 ◽  
pp. 233-237
Author(s):  
Yan Zhong Wang ◽  
Liang Wei Hou ◽  
Yan Qiang Liu ◽  
Rong Shen ◽  
Can Hui Wu ◽  
...  
Keyword(s):  
Machine Tools ◽  
Surface Characteristics ◽  
Complex Surface ◽  
Transformation Process ◽  
Cnc Machining ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Face Gear ◽  
Five Axes ◽  
Complex Parts

This paper describes the machining method of complex surface face gear used CNC machine tools and hob cutter, Based on surface characteristics and gear hob principle. A coordinate transformation process is explained in detail in the five axes CNC machining of complex parts. A CNC hob method is proposed about surface orthogonal gear. An experiment is done for validating the method.

Analysis on the Influencing Factors of Dynamic Characteristics for the Linear Motion Station of DCG

2013 ◽  
Vol 437 ◽  
pp. 194-197
Author(s):  
Xiao Peng Li ◽  
Xing Ju ◽  
Guang Hui Zhao ◽  
Ya Min Liang ◽  
Hao Tian Yang
Keyword(s):  
Dynamic Characteristics ◽  
High Speed ◽  
Dynamic Performance ◽  
Cnc Machine Tools ◽  
Joint Surface ◽  
Design Parameters ◽  
Machining Accuracy ◽  
Cnc Machine ◽  
Element Analysis ◽  
Feed Drive

Dynamic characteristics of the system have been given more and more attention so as to improve the retention and reliability of machining accuracy. Research has shown that dynamic performance of the feed drive mechanism has significant impact on the processing quality and efficiency of CNC. This paper mainly focuses on the DCG which realizes its motion on the basis of a pair of lead screw. The dynamic performance of the DCG was analyzed by the method of finite element analysis. DCG structure and the key design parameters of the rail joint surface have been studied to find out the influence on its dynamic characteristics. These researches provided a basis for the realization of the CNC feed motion of high-speed and high-precision. Besides, it is also possible to improve the overall performance of CNC machine tools.

scholarly journals Vibration Characteristics of Heavy-Duty CNC Machine Tool-Foundation Systems

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Yang Tian ◽  
Qilin Shu ◽  
Zhifeng Liu ◽  
Yujie Ji
Keyword(s):  
Machine Tools ◽  
Frequency Response Function ◽  
Vibration Characteristics ◽  
Cnc Machine Tools ◽  
Joint Surface ◽  
Cnc Machine Tool ◽  
System Dynamics Model ◽  
Heavy Duty ◽  
Cnc Machine ◽  
Dynamics Model

Vibration characteristics of heavy CNC machine tools are directly affected by their foundations. To analyze vibrations of heavy CNC machine tools caused by internal and external loads, a system dynamics model of a rigid-flexible coupled heavy-duty CNC machine tool-foundation system was established based on the multibody transfer matrix method. Since joint surfaces can seriously affect the accuracy of system mechanics models, the substructure synthesis method was first used to establish a dynamic model of the joint surface. The frequency response function was then used to identify model parameters. Moreover, to improve the accuracy of parameter identification of the joint surface, a residual frequency compensation function was used to reconstruct the frequency response function. Finally, the multibody system model was implemented by combining surface elements. To verify the system dynamics model, an experimental model of the heavy-duty machine-foundation system was built, taking into consideration joint surface factors, and the theoretical model was validated by comparing theoretical, simulation, and experimental results. Using the theoretical model, the influence of different forms of concrete foundations, materials, and soil properties on the vibration characteristics of heavy-duty CNC machine tools was analyzed, thus providing a theoretical basis for optimizing and improving CNC machine tools.

Thermal Deformation Finite Element Analysis for the Ram of Heavy-Duty CNC Machine Tools

2012 ◽  
Vol 433-440 ◽  
pp. 7159-7164 ◽  
Author(s):  
Yong Lu ◽  
Gang Wei Cui ◽  
Dong Gao ◽  
Heng Chao Xiang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Machine Tools ◽  
Thermal Deformation ◽  
Theoretical Data ◽  
Cnc Machine Tools ◽  
Cnc Milling ◽  
Heavy Duty ◽  
Cnc Machine ◽  
Element Analysis

The thermal deformation of ram system in a heavy-duty CNC milling-boring machine tool has a serious effect on its accurateness. This paper analyses quantificationally the temperature field and deformation field of the ram system, and gives the ram’s heat sources, calculating quantity of heat and transferring type of heat. And then a finite element analysis is performed, the analyzing results provide basic theoretical data for thermal error compensation in machine tools.

An approach to evaluating product assembly precision considering the effect of joint surface deformation

2014 ◽  
Vol 228 (14) ◽  
pp. 2604-2617 ◽  
Author(s):  
Cong Lu ◽  
Song-Ling Wang
Keyword(s):  
Surface Deformation ◽  
Hybrid Genetic Algorithm ◽  
Back Propagation ◽  
Propagation Model ◽  
Joint Surface ◽  
Element Analysis ◽  
Assembly Sequences ◽  
Variation Propagation ◽  
Product Assembly ◽  
Assembly Precision

This paper proposes an approach to evaluating the product assembly precision in different assembly sequences, considering the effect of joint surface deformation. Three assembly variation sources, including manufacturing variation, assembly clearance and joint surface deformation, which have effect on the final assembly precision are analyzed. Based on finite element analysis, a hybrid genetic algorithm and back-propagation neural network model is built to predict the assembly variations, which are caused by the joint surface deformation under different assembly conditions and different parameters of the joint surface. An assembly variation propagation model is built, and a product assembly precision evaluation approach is proposed to identify the feasible assembly sequences, and the optimal assembly sequence considering the effect of the joint surface deformation. Finally, a case study is given to verify the proposed approach.

Study on Dynamic Characteristics of Feed Systems with Single and Double Ball Screws

2013 ◽  
Vol 433-435 ◽  
pp. 3-7 ◽  
Author(s):  
Xi He Ding ◽  
Jian Yong Zheng ◽  
Jun Tang Yuan ◽  
Zhen Hua Wang
Keyword(s):  
Dynamic Characteristics ◽  
Natural Frequencies ◽  
Calculated Data ◽  
Cnc Machine Tools ◽  
Joint Surface ◽  
Vibration Modes ◽  
Cnc Machine ◽  
Feed System ◽  
Element Analysis ◽  
Screw Drive

As the executive component of CNC machine tools feed movement and auxiliary motion, feed system plays an important part in ensuring the positioning accuracy, sensitivity and stability. By taking single-screw-drive feed system and double-screw-drive feed system of CNC as the object of study, two-degree-of-freedom vibration models of them are established to analyze the dynamic characteristics, and further calculate modal vibration modes and natural frequencies. The finite element analysis models of the two systems are also established, concerning the influence of joint surface, vibration modes and natural frequencies are obtained by means of modal analysis. By comparing the simulation results and the calculated data, the feed systems vibration modes and natural frequencies can be accurately calculated by the proposed vibration models, and the relative errors of corresponding vibration frequencies are controlled within 15%.

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