Experimental Investigation and Improvement of Dynamic Performance of High-Speed Grinding Machine

2010 ◽  
Vol 156-157 ◽  
pp. 1609-1612 ◽  
Author(s):  
Xiao Long Shen ◽  
Cheng Gao Ren ◽  
Zhi Mou Pi ◽  
Dai Li Zhu
Keyword(s):  
High Speed ◽  
Dynamic Performance ◽  
Power Spectra ◽  
Weak Links ◽  
Machining Accuracy ◽  
Variable Speed ◽  
High Speed Grinding ◽  
Improvement Measures ◽  
Grinding Machine

Design of the dynamic performance of a machine tool is an effective approach to improve the machining accuracy. In this paper, the dynamic performance of high-speed cylindrical grinder has been studied systematically to improve the surface quality of high-speed grinding. According to the mode shape graphs and the power spectra, the vibration weak links and the main vibration sources of the prototype were found, and then the improvement measures were presented by designing the dynamic performance tests. The fact that the chatter of high-speed grinding can be suppressed to a certain extent with variable speed grindings was verified in variable speed grinding experiments at high speed.

Analysis and Experimental Investigation of Chatter Suppression in High-Speed Cylindrical Grinding

2010 ◽  
Vol 34-35 ◽  
pp. 1936-1940 ◽  
Author(s):  
Xiao Long Shen ◽  
Lai Xi Zhang ◽  
Hua Long ◽  
Zhi Xiong Zhou
Keyword(s):  
Experimental Investigation ◽  
High Speed ◽  
Spectral Estimation ◽  
Vibration Energy ◽  
Variable Speed ◽  
Vibration Signals ◽  
Chatter Suppression ◽  
High Speed Grinding ◽  
The Stability

In this paper, the variable speed grinding experiments at high speed have been studied systematically, and the method of improving the surface quality of high-speed grinding has been discussed on the basis of analysis of the chatter and the stability of the high-speed grinder. Through the variable speed grinding experiments at high speed, the vibration characteristics were measured by the vibration energy, and the power spectrum were analyzed by the maximum entropy spectral estimation of the vibration signals in time series. The results confirm that the chatter of high-speed grinding can be suppressed by the variable speed grinding to a certain extent.

scholarly journals Mechanism of Chip Formation Process at Grinding

2019 ◽  
Vol 297 ◽  
pp. 09002
Author(s):  
Vyacheslav Shumyacher ◽  
Sergey Kryukov ◽  
Olga Kulik ◽  
Xavier Kennedy
Keyword(s):  
Formation Process ◽  
Chip Formation ◽  
High Speed ◽  
Cutting Speed ◽  
Dimensional Accuracy ◽  
Processing Parameters ◽  
Abrasive Grain ◽  
Wave Heating ◽  
High Speed Grinding

The mechanism of chip formation process at grinding is described, which involves a high-speed interaction of abrasive grain and metal, which leads to a concentration of thermal energy in front of the dispersing element (grain), causing a locally concentrated shift in the metal microvolume. In “abrasive grain -metal” contact a dissipative structure is formed which existence is supported by exchange of energy and substance with environment. Due to shock compression of the metal microvolume with abrasive grain, shock-wave heating is realized, initiating emission of electrons ionizing the lubricating cooling fluid in the zone of formation of side micro-scratches left by abrasive. The results obtained in the course of the research can be used to explain the mechanisms of chip formation, as well as the course of the physical and mechanical processes occurring on the surface layers of the grinded workpieces. By controlling chip formation processes at high-speed grinding, by optimally selecting the appropriate ratios between cutting speed and other processing parameters, a reduction in process thermal density can be achieved, which, with the highest productivity, will allow to obtain the required quality of the surface layer of the workpieces and a given dimensional accuracy.

Research on Machining Simulation of Ultra High-Speed Grinding Machine Tool Based on Web

2010 ◽  
Vol 126-128 ◽  
pp. 77-81
Author(s):  
Wan Shan Wang ◽  
Peng Guan ◽  
Tian Biao Yu
Keyword(s):  
Machine Tool ◽  
Geometric Modeling ◽  
High Speed ◽  
Cnc Machining ◽  
Machining Process ◽  
Machining Simulation ◽  
Ultra High Speed ◽  
Cad Cam ◽  
High Speed Grinding ◽  
Grinding Machine

The future development of the manufacturing is using VR technology to make the machining simulation before the actual machining process made. The machining simulation of Ultra High-speed Grinding Machine Tool is researched in this paper. Firstly, using UG/NX software and VRML, the geometric modeling of machine tool is modeled. Secondly, through using Java and Javascript language, the operation and display of machining process of ultra high-speed grinding are realized. The main technologies include NC codes compiling, collision detection and material removal. Thirdly, the example of machining simulation using virtual ultra high-speed grinding machine tool can be obtained in the paper. Compared to other CNC machining simulation methods, the method in the paper has reality display, rich features, a good man-machine interaction, etc., and it does not rely on expensive CAD/CAM software. The system files generated by the machining simulation have the small size and can be transferred on the network easily.

Analysis of Modality of CK61125 CNC Lathe Spindle Box

2010 ◽  
Vol 455 ◽  
pp. 23-27
Author(s):  
Jian Xi Yang ◽  
M. Yang ◽  
F.K. Cui ◽  
Hong Yu Xu
Keyword(s):  
Modal Analysis ◽  
Dynamic Performance ◽  
Weak Links ◽  
Machining Accuracy ◽  
Vibration Modes ◽  
Simulation Environment ◽  
Processing Efficiency ◽  
Cnc Lathe ◽  
Main Factor ◽  
Ansys Workbench

CNC lathe spindle box is a key component of the CNC lathe system, and its dynamic characteristics are the main factor affecting the machining accuracy and processing efficiency of machine tools. In this paper, CK61125 CNC lathe spindle box model was established by simplifying its structure. Then modal analysis of the spindle box was done and extended to 6-order modes with the platform of co-simulation environment in ANSYS Workbench, and the natural frequencies and vibration modes for lathe spindle box were obtained. The weak links in the spindle box were found, and the improvement schemes are proposed. Finally the lathe spindle box was improved, the modal analysis of the spindle box was made again, and the results showed that the lathe spindle box dynamic performance was improved. All of these results are beneficial for optimization and re-design of the lathe spindle box so that it has better dynamic performance.

Lubrication of Mechatronical Metal Cutting Systems by Means of Technological Liquids

2006 ◽  
Vol 113 ◽  
pp. 367-370
Author(s):  
Vladas Vekteris
Keyword(s):  
Temperature Field ◽  
Experimental Research ◽  
High Speed ◽  
Metal Cutting ◽  
Reynolds Equation ◽  
Grinding Process ◽  
Mechatronic System ◽  
High Speed Grinding ◽  
Aeration Process ◽  
Grinding Machine

Lubrication and cooling of a high speed grinding process in the grinding machine as in a mechatronic system using technological liquids are analyzed in this paper. It is shown that in the case of high grinding speed, technological liquids undergo an aeration process and due to this their physical properties change. Reynolds equation, which estimates the aeration liquid, is derived. It is shown, that the application of such an equation is proper only in the finishing of grinding. Experimental research is also presented in the paper, which shows the influence of technological liquids to the temperature field of the grinding machine and to its automatic control.

scholarly journals Measurement Research of Motorized Spindle Dynamic Stiffness under High Speed Rotating

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Xiaopeng Wang ◽  
Yuzhu Guo ◽  
Tianning Chen
Keyword(s):  
High Speed ◽  
Production Efficiency ◽  
Dynamic Stiffness ◽  
Damping Ratio ◽  
Dynamic Performance ◽  
Machining Accuracy ◽  
Motorized Spindle ◽  
Response Curves ◽  
Tool Technology ◽  
High Speed Machine

High speed motorized spindle has become a key functional unit of high speed machine tools and effectively promotes the development of machine tool technology. The development of higher speed and more power puts forward the stricter requirement for the performance of motorized spindle, especially the dynamic performance which affects the machining accuracy, reliability, and production efficiency. To overcome the problems of ineffective loading and dynamic performance measurement of motorized spindle, a noncontact electromagnetic loading device is developed. The cutting load can be simulated by using electromagnetic force. A new method of measuring force by force sensors is presented, and the steady and transient loading force could be measured exactly. After the high speed machine spindle is tested, the frequency response curves of the spindle relative to machine table are collected at 0~12000 rpm; then the relationships between stiffness and speeds as well as between damping ratio and speeds are obtained. The result shows that not only the static and dynamic stiffness but also the damping ratio declined with the increase of speed.

scholarly journals Studies on Ultra-High Speed Grinding. (2nd Report). Development of Ultra-High Speed Surface Grinding Machine.

1997 ◽  
Vol 63 (4) ◽  
pp. 560-564
Author(s):  
Katsuo SYOJI ◽  
Tsunemoto KURIYAGAWA ◽  
Yutaka INADA ◽  
Kunihiko UN'NO ◽  
Akinori YUI ◽  
...  
Keyword(s):  
High Speed ◽  
Surface Grinding ◽  
Ultra High Speed ◽  
High Speed Grinding ◽  
Grinding Machine

New Development of Supersonic Surface Grinding Machine Tool with a Linear-Motor-Driven Table System

2016 ◽  
Vol 1136 ◽  
pp. 667-672
Author(s):  
Lu Yang ◽  
Yu Can Fu ◽  
Jiu Hua Xu ◽  
Yong Tao Liu
Keyword(s):  
Machine Tool ◽  
High Speed ◽  
High Performance ◽  
Linear Motor ◽  
Grinding Wheel ◽  
Research Activities ◽  
High Speed Grinding ◽  
Grinding Mechanism ◽  
Speed Up ◽  
Grinding Machine

Ultra-high speed grinding (UHSG) is a significant and promising machining technology in grinding hard-to-cut materials. To find out the aerodynamics of the grinding wheel body when the airflow field has subsonic, transonic, and supersonic speed characteristics and clarify the corresponding influence on the grinding mechanism, the study is conducted to develop a supersonic grinding machine tool that is capable of being operated at extreme wheel speed up to 450 m/s and meanwhile accompanying with high grinding capability. In accordance with the main design objectives, a high performance grinding motorized spindle with maximum rotational speed 36000r/min and maximum power 28kW is developed. The linear motor feed driven system is also exploited to satisfy the requirement of maximum reciprocating speed up to 2m/s. Following plenty of specific design and performance analysis works, a prototype of supersonic grinding machine tool is finally developed. In the end, this paper also puts forward a number of further studies and prospective for the research activities on basis of the developed grinder.

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