Design and dynamic optimization of an ultraprecision diamond flycutting machine tool for large KDP crystal machining

2013 ◽  
Vol 69 (1-4) ◽  
pp. 237-244 ◽  
Author(s):  
Yingchun Liang ◽  
Wanqun Chen ◽  
Qingshun Bai ◽  
Yazhou Sun ◽  
Guoda Chen ◽  
...  
Keyword(s):  
Machine Tool ◽  
Dynamic Optimization ◽  
Kdp Crystal

Effect of Optimizing PID Parameters and Spindle Speeds on Processing Performance of KDP Micro-Defect Mitigation Machine Tool

2016 ◽  
Vol 836-837 ◽  
pp. 290-295
Author(s):  
Ming Jun Chen ◽  
Wen Jing Ma ◽  
Yong Xiao
Keyword(s):  
Machine Tool ◽  
Pid Control ◽  
Velocity Fluctuation ◽  
Control Algorithm ◽  
Micro Machining ◽  
Amplitude Variation ◽  
Kdp Crystal ◽  
Fluctuation Frequency ◽  
Fluctuation Amplitude ◽  
The Stability

PID parameters of machine tool for micro-defect mitigation of KDP crystal had been optimized, after which the velocity fluctuation frequency and amplitude variation of motion axis under different spindle speeds were studied. It is evident that the stability and following errors of the system run better under the velocity&acceleration feed forward PID control algorithm and Notch filters. The velocity fluctuation frequency of motion axis varies with spindle speeds significantly when the tool system is stable, while the fluctuation amplitude variation is slightly changed. To be conclude, the optimal working spindle speed is verified to be 4.78×104 rpm based on comparative experiments, at which damage pits can be mitigated by micro-machining successfully with roughness value of 34.4nm.

Kinematics Simulation and Vibration Mode Analysis of Micro Turn-Milling Machine Tool

2013 ◽  
Vol 589-590 ◽  
pp. 378-383
Author(s):  
Cheng Zhe Jin ◽  
Mao Xia Zhu
Keyword(s):  
Machine Tool ◽  
Dynamic Optimization ◽  
Optimization Design ◽  
Vibration Mode ◽  
Mode Analysis ◽  
Milling Machine ◽  
Quality Of Work ◽  
Kinematics Simulation ◽  
Turn Milling

Micro turn-milling has superiority on the productivity and the quality of work pieces, and is more suitable to machine micro-shaft parts and desirable miniature parts based on the turn-milling technology. On the basis of ADAMS and UG software, kinematics simulation of complete machine has been performed, meanwhile, the natural frequency and vibration mode of micro turn-milling machine tool has been analyzed by adoption of modal analysis in this paper. The results forecasts dynamic characteristics of micro turn-milling machine tool. It also provides important reference frame of dynamic optimization design of micro turn-milling machine tool.

Research on Low Speed Servo Control Technology of Ultra-Precision Machine Tool

2007 ◽  
Vol 339 ◽  
pp. 163-167
Author(s):  
X.W. Sun ◽  
Fei Hu Zhang ◽  
Shen Dong ◽  
L.J. Zhang
Keyword(s):  
Machine Tool ◽  
Control Algorithm ◽  
Closed Loop ◽  
Single Point ◽  
Tracking Error ◽  
Machining Process ◽  
Kdp Crystal ◽  
Low Speed ◽  
Precision Machine ◽  
Ultra Precision

An ultra-precision machine is developed by Precision Engineering Research Institute of Harbin Institute of Technology to machine components made of KDP crystal with single point diamond fly cutting technique . A stable ultra-low speed feed of worktable is necessary in the machining process inasmuch as the KDP crystal components to be machined must be high form accuracy, low surface roughness and low surface waveness . This paper analyses the effect on speed stability and positioning accuracy under the control of semi-closed loop and full-closed loop based on the experimental data, and also present a compensating control algorithm of error disturbance feed-forward which enhances the stability of ultra-low speed motion of the semi-closed loop feed control servo system of the machine. The simulation results indicate that the values of the steadystate tracking error decreased to 1/10 after using compensating control algorithm. The P-V value of the aluminum specimen machined by the ultra-precision machine tool was 0.27 wavelengths.

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