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.

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.

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.

scholarly journals Experimental study of single cubic boron nitride grains in the ultrasound-assisted high-speed grinding

2017 ◽  
Vol 9 (2) ◽  
pp. 168781401769354 ◽  
Author(s):  
Dao-hui Xiang ◽  
Zhong-yun Liu ◽  
Zhi-kun Zhou ◽  
Yun-long Yao
Keyword(s):  
Experimental Study ◽  
Boron Nitride ◽  
Surface Quality ◽  
High Speed ◽  
Cubic Boron Nitride ◽  
Grinding Force ◽  
Abrasive Particles ◽  
Ultrasonic Assisted ◽  
High Speed Grinding

The kinematic characteristics, grinding force, surface quality of workpiece surface, and wear of abrasive particles were studied by theoretical analysis and experimental study on the single cubic boron nitride abrasive particles under ultrasonic-assisted high-speed grinding. Under the condition of the same grinding parameters, the motion characteristics and the grinding forces of the two machining modes of general grinding and ultrasonic-assisted grinding are compared and analyzed. Research shows that the ultrasonic vibration is applied in the common external circular grinding on grinding particle movement characteristics changed obviously, grinding particle trajectory of variable length, cutting groove width wider, thereby improving the grinding efficiency and the grinding removal rate; ultrasonic assisted under high speed grinding, the grinding force is higher than that of common grinding force is small, efficiency of grinding under ultrasonic processing mode is much higher than ordinary grinding, the surface quality of the workpiece has improved markedly.

Research on Heat Transfer and Calculation Method of Workpiece Surface Temperature in High Speed Grinding

2011 ◽  
Vol 325 ◽  
pp. 28-34
Author(s):  
Bei Zhi Li ◽  
Da Hu Zhu ◽  
Zhen Xin Zhou ◽  
Jing Zhu Pang ◽  
Jian Guo Yang
Keyword(s):  
Heat Transfer ◽  
Surface Temperature ◽  
High Speed ◽  
Removal Rate ◽  
Convective Heat Transfer Coefficient ◽  
Calculation Model ◽  
Grinding Wheel ◽  
Workpiece Surface ◽  
High Speed Grinding

The surface quality of workpiece depends largely on workpiece surface temperature in grinding. The key parameters on workpiece surface temperature calculation model have been researched and the calculation model constructed in this paper, including the convective heat transfer coefficient (CHTC) (hf), heat flux (qch) and the grain contact half-width (r0) which are assumed to be constant in workpiece surface temperature model given by Rowe. And the improved Rowe model has been proposed (Rowe/Li model) which not only involves the grinding process parameters such as the speed of wheel and workpiece, but also the geometric parameters of workpiece, grinding wheel and abrasive. The experimental results of the surface temperature in high-speed grinding are very close to the results by Rowe / Li model. Relative to the Rowe model, the obtained surface temperature by Rowe / Li model has decreased by about 35-40%. Under the conditions of the same material removal rate, high-speed grinding, namely, increasing wheel speed can effectively reduce the surface temperature and improve the grinding quality.

scholarly journals Flat grinding effectiveness increase due to rational work cycle use

2020 ◽  
Vol 2020 (9) ◽  
pp. 7-11
Author(s):  
Yuriy Zubarev ◽  
Alexsandr Priyomyshev
Keyword(s):  
Hard Alloy ◽  
Labor Productivity ◽  
High Speed ◽  
Work Cycle ◽  
High Speed Grinding ◽  
Grinding Machines ◽  
Production Areas

A possibility for machinery billet machining effectiveness increase at the expense of the use of high-speed grinding machines operated in an automated cycle of machining mode changes is considered. It allows performing operations of roughing and then finishing ensuring the required accuracy and quality of surfaces worked. The application of high-speed force grinding allows rejecting rough and finish preliminary milling and, in such a way, decreasing the number of machine equipment, hard-alloy cutters, production areas and increasing labor productivity.

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