scholarly journals A High-Speed Precision Bearing Internal Grinding Machine and Grinding Process

2021 ◽  
Author(s):  
Zhou Chang ◽  
Qian Jia ◽  
Lai Hu
Keyword(s):  
High Speed ◽  
Engineering Application ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Guide Rail ◽  
Precision Grinding ◽  
Internal Grinding ◽  
High Speed Grinding ◽  
Bearing Raceway ◽  
Grinding Machine

Abstract In order to meet the requirement of grade P2 bearing grinding, we designed a high-speed internal grinding machine used for bearing raceway and inner circle grinding. The machine adopts T-type layout and 4-axis NC linkage. It is supported by hydrostatic pressure and driven directly by torque motor. Besides, it is equipped with high-speed hydrostatic grinding wheel spindle of ELKA. Our design includes hydrostatic workpiece shaft, hydrostatic turntable and hydrostatic guide rail. The design of this machine can ensure the high-speed grinding process and research has good engineering application value. Finally, the designed precision grinding machine is used to grind the P2 bearing raceway with reasonable processing technology.

Development of CBN Internal Grinding Machine for Precision Grinding of the Air-Conditioner Compressor Piston Hole

2009 ◽  
Vol 76-78 ◽  
pp. 43-48
Author(s):  
Y.G. Zheng ◽  
W.G. Liu ◽  
Bin Jiang ◽  
Hang Gao ◽  
S.G. Zheng
Keyword(s):  
High Speed ◽  
Grinding Process ◽  
Air Conditioner ◽  
Precision Grinding ◽  
Cbn Wheel ◽  
Internal Grinding ◽  
Compressor Piston ◽  
High Speed Grinding ◽  
Grinding Mechanism ◽  
Grinding Machine

According to the demand for internal grinding machine in precise machining of air-conditioner compressor piston hole, a kind of high precise CNC internal grinding machine with CBN wheel is developed by adopting self-adaptive control for grinding process. Meanwhile, grinding precision and stability are achieved by overcoming many problems emerging from high-speed grinding process with CBN wheel. More than 100000 times’ grinding experimental results show that the whole performance of grinding machine developed is the same as that of the same kind of international machine. In order to study grinding mechanism with CBN wheels and then improve machine’s capability, grinding data in several machining cycles is analyzed.

Study on Properties of Grinding Fluid Jet and Nozzle Position for Super-High Speed Point Grinding

2010 ◽  
Vol 135 ◽  
pp. 452-457
Author(s):  
Shi Chao Xiu ◽  
Ji Man Luo ◽  
Zhi Li Sun
Keyword(s):  
Contact Area ◽  
High Speed ◽  
Fluid Velocity ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Pressure Balance ◽  
Balance Principle ◽  
Grinding Fluid ◽  
High Speed Grinding ◽  
Grinding Machine

Super-high speed point grinding is a new high-speed grinding technology with some excellent machining performances. In such a grinding process, there is a high-speed airflow rotating around the edge of grinding wheel which hinders the grinding fluid from injecting into the contact area and makes the fluid atomization and splash during grinding process, so as to decrease the ratio of effective grinding fluid into contact area and affect the surface integrity of workpiece. In this paper, the structure and properties of grinding fluid jet is analyzed, the velocity distribution field of the round turbulent jet is discussed theoretically and simulated. Based on the pressure balance principle, a mathematical model is established for the jet velocity at the fluid nozzle, which enables the grinding fluid to pass through the high speed airflow and enter into the contact area. According to the analysis of the grinding fluid velocity in the jet core, an engineering formula is given to calculate the position limit of nozzle during grinding process, as well as a practical design example for the high speed grinding machine is presented.

scholarly journals Experimental Analysis of Process Parameter Effects on Vibrations in the High-Speed Grinding of a Camshaft

2020 ◽  
Vol 66 (3) ◽  
pp. 175-183 ◽  
Author(s):  
Tao Liu ◽  
Zhaohui Deng ◽  
Lishu Lv ◽  
Shuailong She ◽  
Wei Liu ◽  
...  
Keyword(s):  
Process Parameters ◽  
High Speed ◽  
Survey Methods ◽  
Process Condition ◽  
Speed Ratio ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Surface Waviness ◽  
High Speed Grinding ◽  
Grinding Machine

The capacity to minimize vibrations in grinding by the selection of appropriate process parameters is a significant benefit in the process optimization of cam grinding. This paper presents survey methods to characterize and quantify the vibrations and waviness in a camshaft grinding application. First, a modal analysis was conducted to study the dynamic characteristic of a camshaft grinding machine. Then, developed methods were applied to study the influences of various parameters on vibrations in the high-speed grinding of a camshaft. Furthermore, the influence of each grinding process condition on surface waviness in high-speed camshaft grinding was studied. The results show that the vibrations and the surface waviness change with the increase of grinding depth, and an appropriate grinding wheel speed combined with a workpiece speed has, for most grinding conditions, a reducing effect on vibration magnitudes and waviness. Finally, the specific indications about the optimal grinding process parameters in terms of dynamic characteristics of the grinding machine were given, and the speed ratio=1.2 is a novel choice.

Design on High-Speed Precision Grinder

2006 ◽  
Vol 304-305 ◽  
pp. 492-496 ◽  
Author(s):  
Yu Hou Wu ◽  
L.X. Zhang ◽  
Ke Zhang ◽  
Song Hua Li
Keyword(s):  
High Speed ◽  
Servo Control ◽  
Grinding Wheel ◽  
Control Technology ◽  
Precision Grinding ◽  
Spindle Unit ◽  
Central Controller ◽  
High Speed Grinding ◽  
Dynamic Performances ◽  
Feed Unit

As one of the modern manufacture technology, high-speed precision grinding takes an important part in the modern manufacture field. With the development of the technology on high-speed spindle unit, linear precision high-speed feed unit, manufacture of grinding wheel, measurement etc, a great deal of research achievements make it possible for high-speed precision grinding. In this paper, using PMAC (Programmable Multi-Axis Controller)—PC as the central controller, a new kind of high-speed precision grinder is designed and manufactured. The servo control technology of linear motor is investigated. The dynamic performances of the machine are analyzed according to the experimental results. Elliptical workpieces have been machined with this new high-speed precision grinder. Based on these research results, a very helpful approach is provided for the precision grinding of complicated workpieces, and these results promote the development of high speed grinding too.

Study on Effect of Grinding Fluid Supply Parameters on Surface Integrity in Quick-Point Grinding for Green Manufacturing

2008 ◽  
Vol 53-54 ◽  
pp. 209-214 ◽  
Author(s):  
Shi Chao Xiu ◽  
Ya Dong Gong ◽  
Guang Qi Cai
Keyword(s):  
Surface Integrity ◽  
High Speed ◽  
Point Contact ◽  
Green Manufacturing ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Fluid ◽  
Fluid Supply ◽  
High Speed Grinding ◽  
Grinding Power

In high and super-high speed grinding process, there is an airflow layer with high speed around the circle edge of the grinding wheel that hinders the grinding fluid into contact layer, namely, the air barrier effect. The speed of airflow layer is directly proportional to the square of the wheel speed. Quick-point grinding is a new type of high and super-high speed grinding process with a point contact zone and less grinding power. The edge effect of the air barrier is weakened because the thin CBN wheel is applied in the process. By the analysis of dynamic pressure and velocity distributions in the airflow layer around the wheel edge, the mathematic models of the flow and jet pressure of grinding fluid for effective supply in the process were established and the process of optimization calculation of the jet nozzle diameter for green manufacturing was also analyzed based on the thermodynamics and the technical character of quick-point grinding process. The quick-point grinding experiment for surface integrity influenced by grinding fluid supply parameters was performed.

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.

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.

Experimental Research on High Speed Grinding of Silicon Nitride Ceramic Spindle

2016 ◽  
Vol 874 ◽  
pp. 253-258
Author(s):  
Ke Zhang ◽  
Jian Sun ◽  
He Wang ◽  
Yu Hou Wu
Keyword(s):  
Silicon Nitride ◽  
High Speed ◽  
Linear Velocity ◽  
Grinding Wheel ◽  
Feed Speed ◽  
Silicon Nitride Ceramic ◽  
Technical Parameters ◽  
Internal Grinding ◽  
Brittle Rupture ◽  
High Speed Grinding

Grinding is a main method of silicon nitride ceramic in finish machining stage. The technical parameters had an important influence on the surface quality of silicon nitride ceramic. The silicon nitride ceramic spindle was ground by the high-speed cylindrical grinder MGKS1432-H. The relations between different speed parameters and surface roughness were researched. The cylindrical and internal high speed grinding experiments of silicon nitride ceramics spindle were carried out. The S-4800 scanning electron microscope was used to explore the roughness change rule of the grinded surface under the condition of only changed grinding wheel’s velocity. In the process of cylindrical and internal grinding on silicon nitride ceramic spindle, the roughness tended to decrease with the linear velocity increasing, and increased with the radial feed speed increasing and decreased with the wheel shaft’s oscillation speed increasing. The result indicated that the linear velocity of grinding wheel influenced the sample’s roughness most. The effect of radial feed speed on the roughness is next only to the effect from linear velocity. The effect of shaft’s oscillation speed on the roughness is the lowest of the three factors. In the process of internal grinding, with the linear velocity increasing, the ceramic material transformed from brittle rupture to plastic deformation and the roughness appeared one peak. These results were very helpful to optimize the grinding parameters and improve grinding efficiency.

New Liquid Transfer Active Balancing System Using Compressed Air for Grinding Machine

2015 ◽  
Vol 137 (1) ◽  
Author(s):  
Pan Xin ◽  
Wu Haiqi ◽  
Gao Jinji ◽  
Wang Weimin
Keyword(s):  
High Speed ◽  
Gas Pressure ◽  
Compressed Air ◽  
Grinding Wheel ◽  
Active Balancing ◽  
High Speed Grinding ◽  
Liquid Transfer ◽  
Grinding Machines ◽  
Grinding Machine

Grinding wheel unbalance will result in vibrations of grinding machines and affect the quality and precision of workpieces. Therefore, a balancing system is necessary for grinding machines to lower the vibrations caused by unbalance. In this study, a liquid transfer active balancing system, in which the balancing liquid was forced by compressed air to transfer between opposite chambers, was applied to the high-speed grinding spindle. The requirements of gas pressure and linearity of balancing ability were analyzed to confirm the feasibility of the proposed device. In addition, an active balancing experiment was also carried out efficiently during the operation.

Study on Balance Precision of Ultra-High Speed CBN Grinding Wheel System

2008 ◽  
Vol 375-376 ◽  
pp. 614-618 ◽  
Author(s):  
Shi Chao Xiu ◽  
Jian Liu ◽  
Chang He Li ◽  
Guang Qi Cai
Keyword(s):  
High Speed ◽  
Dynamic Performance ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Rigid Rotor ◽  
Machining Quality ◽  
Ultra High Speed ◽  
High Speed Grinding ◽  
Cbn Grinding Wheel ◽  
Grinding System

The balance precision of grinding wheel is a key technical parameter in ultra-high speed grinding process. The actual standard for the balance precision of rigid rotor is not fit for the thin ultra-high speed grinding system well. The unbalance factors affected on the ultra-high speed grinding wheel and its system were analyzed, and its effects on the machining quality in the process were also discussed. The theory and select principle of the balance precision for ultra-high speed grinding wheel system were studied. The test of dynamic performance was performed for the thin ultra-high speed CBN grinding wheel system whose structure was optimized. The groundwork to establish the standard of balance precision for thin ultra-high speed grinding system was offered.

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