A Study on Airflow Field of Super-High Speed Pectination Grinding Wheel Based on PIV

2008 ◽  
Vol 389-390 ◽  
pp. 332-337 ◽  
Author(s):  
Ya Dong Gong ◽  
Yan Cheng Zhang ◽  
Hu Li ◽  
Wan Shan Wang
Keyword(s):  
Data Processing ◽  
Data Acquisition ◽  
Field Distribution ◽  
High Speed ◽  
Grinding Wheel ◽  
Experiment Research ◽  
Theory Analysis ◽  
General Rules ◽  
High Speed Grinding ◽  
Airflow Field

Adopting the method of PIV, systematical theory analysis and experiment research were made on the airflow field distribution of super-high speed pectination grinding wheel, as well as experiment design and data acquisition, the data processing was carried out through the software of FlowMap, Tecplot, and Matlab. By analysis and discussion focused on experiment results, the general rules of airflow field distribution in super-high speed pectination grinding wheel were preliminary drawn, which provides the research foundation with a view to find a new method for the effective supply of super-high speed grinding coolant.

Theoretical Analysis and Simulation of Airflow of Super High-Speed Grinding Wheel

2007 ◽  
Vol 329 ◽  
pp. 507-510 ◽  
Author(s):  
Ya Dong Gong ◽  
H. Li ◽  
Guang Qi Cai
Keyword(s):  
High Speed ◽  
Particle Image ◽  
Viscosity Coefficient ◽  
Artificial Viscosity ◽  
Boundary Layer Theory ◽  
Grinding Wheel ◽  
Continuous Analysis ◽  
High Speed Grinding ◽  
Airflow Field ◽  
Solving Strategy

The airflow field of super-high speed grinding was analyzed in the paper and the method of computing and analyzing the distribution of the field has been brought forward by applying boundary layer theory. Adopting the method of finite element, the model of airflow field in the 3-D grinding zone has been built up by using software; the solving strategy and the boundary conditions has been defined, where artificial viscosity coefficient in the repetitive and continuous analysis and the method by applying inertia relaxation have been discussed, which helped to revolve stability. The results of simulation was given and analyzed, which can be validated with experiment by using the equipment of PIV (particle image of velocity).

The Experiment Method of the Study on the Airflow Field around the Grinding Wheel in Super-High Speed Based on PIV

2007 ◽  
Vol 359-360 ◽  
pp. 185-188 ◽  
Author(s):  
Ya Dong Gong ◽  
Hu Li ◽  
Yan Cheng Zhang ◽  
Guang Qi Cai ◽  
Zhao Hui Deng
Keyword(s):  
Experimental Data ◽  
High Speed ◽  
Particle Image ◽  
Processing Method ◽  
Grinding Wheel ◽  
Experiment Method ◽  
High Speed Grinding ◽  
Airflow Field

The investigation of the experiment method on airflow field around super-high grinding wheel by PIV (Particle Image of Velocity, PIV) instrument was introduced in the paper. The measure system and scheme were designed for the experiment with PIV applied in the super-high speed grinding wheel for the airflow. The processing method of experimental data was discussed and the experiment result validated the feasibility of the experiment method.

Explosion accident analysis of ultra-high-speed grinding wheel

2020 ◽  
pp. 105209
Author(s):  
Yao Wu ◽  
Pan Lu ◽  
Feihong Lin ◽  
Wencheng Bao ◽  
Meina Qu ◽  
...  
Keyword(s):  
High Speed ◽  
Grinding Wheel ◽  
Accident Analysis ◽  
Ultra High Speed ◽  
High Speed Grinding

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.

Ultra-High Speed Grinding Using a CBN Wheel for a Mirror-Like Surface Finish

2005 ◽  
Vol 291-292 ◽  
pp. 67-72 ◽  
Author(s):  
M. Ota ◽  
T. Nakayama ◽  
K. Takashima ◽  
H. Watanabe
Keyword(s):  
Surface Finish ◽  
High Speed ◽  
High Efficiency ◽  
Ground Surface ◽  
Machining Process ◽  
Grinding Wheel ◽  
Cbn Wheel ◽  
Ultra High Speed ◽  
High Speed Grinding ◽  
Grinding Conditions

There are strong demands for a machining process capable of reducing the surface roughness of sliding parts, such as auto parts and other components, with high efficiency. In this work, we attempted to grind hardened steel to a mirror-like surface finish with high efficiency using an ultra-high speed grinding process. In the present study, we examined the effects of the work speed and the grinding wheel grain size in an effort to optimize the grinding conditions for accomplishing mirror-like surface grinding with high efficiency. The results showed that increasing the work speed, while keeping grinding efficiency constant, was effective in reducing the work affected layer and that the grinding force of a #200 CBN wheel was lower than that of a #80 CBN wheel. Based on these results, a high-efficiency grinding step with optimized grinding conditions was selected that achieved excellent ground surface quality with a mirror-like finish.

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.

Researches and Simulations on Hydrodynamic in Super High Speed Grinding Area

2006 ◽  
Vol 315-316 ◽  
pp. 541-545
Author(s):  
Ya Dong Gong ◽  
H. Li ◽  
X.X. Zhao ◽  
Wan Shan Wang
Keyword(s):  
Computer Simulations ◽  
High Speed ◽  
Dynamic Pressure ◽  
Wheel Speed ◽  
Lubrication Theory ◽  
Grinding Wheel ◽  
Theory Theory ◽  
Hydrodynamic Action ◽  
High Speed Grinding ◽  
And Mathematics

It analyzed the conditions in hydrodynamic action of coolant in super high speed grinding area and described the conception of lubricate induce force in the paper. Using fluid dynamical lubrication theory, theory analyses and mathematics modeling on lubricate induce force in plane grinding with non-porous grinding wheel were carried out, also the computer simulations were done, and the conclusion was theoretically verified by tests in interrelated material documents. On the bases of this, by analyzing the effects of parameters and pointing out grinding wheel speed, grinding wheel width significantly influences the max dynamic pressure in grinding area, thus the analyses indicated that it rises with the speed of grinding wheel increasing.

scholarly journals MIDAS-W: a workstation-based incoherent scatter radar data acquisition system

2000 ◽  
Vol 18 (9) ◽  
pp. 1231-1241 ◽  
Author(s):  
J. M. Holt ◽  
P. J. Erickson ◽  
A. M. Gorczyca ◽  
T. Grydeland
Keyword(s):  
Data Processing ◽  
Data Acquisition ◽  
High Speed ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Incoherent Scatter Radar ◽  
Raw Data ◽  
Incoherent Scatter ◽  
Scatter Radar ◽  
Instruments And Techniques

Abstract. The Millstone Hill Incoherent Scatter Data Acquisition System (MIDAS) is based on an abstract model of an incoherent scatter radar. This model is implemented in a hierarchical software system, which serves to isolate hardware and low-level software implementation details from higher levels of the system. Inherent in this is the idea that implementation details can easily be changed in response to technological advances. MIDAS is an evolutionary system, and the MIDAS hardware has, in fact, evolved while the basic software model has remained unchanged. From the earliest days of MIDAS, it was realized that some functions implemented in specialized hardware might eventually be implemented by software in a general-purpose computer. MIDAS-W is the realization of this concept. The core component of MIDAS-W is a Sun Microsystems UltraSparc 10 workstation equipped with an Ultrarad 1280 PCI bus analog to digital (A/D) converter board. In the current implementation, a 2.25 MHz intermediate frequency (IF) is bandpass sampled at 1 µs intervals and these samples are multicast over a high-speed Ethernet which serves as a raw data bus. A second workstation receives the samples, converts them to filtered, decimated, complex baseband samples and computes the lag-profile matrix of the decimated samples. Overall performance is approximately ten times better than the previous MIDAS system, which utilizes a custom digital filtering module and array processor based correlator. A major advantage of MIDAS-W is its flexibility. A portable, single-workstation data acquisition system can be implemented by moving the software receiver and correlator programs to the workstation with the A/D converter. When the data samples are multicast, additional data processing systems, for example for raw data recording, can be implemented simply by adding another workstation with suitable software to the high-speed network. Testing of new data processing software is also greatly simplified, because a workstation with the new software can be added to the network without impacting the production system. MIDAS-W has been operated in parallel with the existing MIDAS-1 system to verify that incoherent scatter measurements by the two systems agree. MIDAS-W has also been used in a high-bandwidth mode to collect data on the November, 1999, Leonid meteor shower.Key words: Electromagnetics (instruments and techniques; signal processing and adaptive antennas) – Ionosphere (instruments and techniques)

Dynamic Analysis of a High-Speed Grinding Spindle

2011 ◽  
Vol 215 ◽  
pp. 89-94 ◽  
Author(s):  
Jing Zhu Pang ◽  
Bei Zhi Li ◽  
Jian Guo Yang ◽  
Zhou Ping Wu
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
High Speed ◽  
Grinding Wheel ◽  
Static Characteristics ◽  
Motorized Spindle ◽  
Element Analysis ◽  
Spindle System ◽  
The Finite Element Analysis ◽  
High Speed Grinding

This paper presents the effects of spindle system configuration on the dynamic and static characteristics of high speed grinding. A 3D physical mode of high-speed grinding motorized spindle system with rotation speed of 150m/s was provided. The motorized spindle system consists of bearings, rotor, stator, spindle housing and grinding wheel. Based on the finite element method (FEM), the static characteristics, dynamic and the transient response are analyzed based on the finite element analysis software NASTRAN. It is shown that the spindle overhanging, bearing span have a significant effort on spindle deflection. The dynamic analysis shows no resonance will happen during its speed range. The methods and solutions for the motorized spindle system design and engineering applications was given in this paper.

Optimization of Segmented Grinding Wheel Matrix Based on Super High-Speed Grinding

2010 ◽  
Vol 135 ◽  
pp. 355-360
Author(s):  
J.Q. Zhang ◽  
Zi Rui Pang ◽  
P. Guan ◽  
Wan Shan Wang ◽  
H.Z. Pi
Keyword(s):  
High Speed ◽  
Theoretical Formula ◽  
Grinding Wheel ◽  
Matrix Strength ◽  
High Speed Grinding ◽  
High Speed Rotation ◽  
Speed Rotation ◽  
And Control ◽  
Segmented Grinding Wheel ◽  
Section Form

It is different from the traditional integrated super high-speed grinding wheel, the centrifugal force has greater impact on segmented grinding wheel in super high-speed rotation. In this paper, in order to ensure the safety of super high-speed grinding wheel, models for the connection between inner micro-unit’s displacement and stress of wheel matrix were established to optimize high-speed grinding wheel section form, reduce the centrifugal stress and control the radial displacement of grinding wheel. Consider the structural and mechanical characteristics of wheel matrix, strength check of the theoretical formula were also established. Taking into account the factors of aerodynamic and wheel connector effects, at last the design of segmented super high-speed grinding matrix was optimized with finite element method.

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