scholarly journals Grinding Fluid Jet Characteristics and Their Effect on a Gear Profile Grinding Process

Inventions ◽  
2017 ◽  
Vol 2 (4) ◽  
pp. 27
Author(s):  
Philip Geilert ◽  
Carsten Heinzel ◽  
André Wagner
Keyword(s):  
Grinding Process ◽  
Profile Grinding ◽  
Grinding Fluid ◽  
Jet Characteristics ◽  
Gear Profile

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.

Probe Position Planning for Measuring Cylindrical Gears on a Four-Axis CNC Machine

2012 ◽  
Vol 579 ◽  
pp. 297-311
Author(s):  
Yi Hui Lee ◽  
Shih Syun Lin ◽  
Yi Pei Shih
Keyword(s):  
Mathematical Models ◽  
Gear Tooth ◽  
Experimental Result ◽  
Tooth Surface ◽  
Measuring Process ◽  
Profile Grinding ◽  
Cylindrical Gears ◽  
Large Size ◽  
Grinding Machine ◽  
Gear Profile

During large-size gear manufacturing by form grinding, the actual tooth surfaces will differ from the theoretical tooth surface because of errors in the clamping fixture and machine axes and machining deflection. Therefore, to improve gear precision, the gear tooth deviations should be measured first and the flank correction implemented based on these deviations. To address the difficulty in large-size gear transit, we develop an on-machine scanning measurement for cylindrical gears on the five-axis CNC gear profile grinding machine that can measure the gear tooth deviations on the machine immediately after grinding, but only four axes are needed for the measurement. Our results can serve as a foundation for follow-up research on closed-loop flank correction technology. This measuring process, which is based on the AGMA standards, includes the (1) profile deviation, (2) helix deviation, (3) pitch deviation, and (4) flank topographic deviation. The mathematical models for measuring probe positioning are derived using the base circle method. We also calculate measuring positions that can serve as a basis for programming the NC codes of the measuring process. Finally, instead of the gear profile grinding machine, we used the six-axis CNC hypoid gear cutting machine for measuring experiments to verify the proposed mathematical models, and the experimental result was compared with Klingelnberg P40 gear measuring center.

A Heat Transfer Model of Grinding Process Based on Energy Partition Analysis and Grinding Fluid Cooling Application

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Guoxu Yin ◽  
Ioan D. Marinescu
Keyword(s):  
Heat Transfer ◽  
Contact Area ◽  
Frictional Resistance ◽  
Heat Transfer Model ◽  
Heat Energy ◽  
Grinding Wheel ◽  
Transfer Model ◽  
Grinding Process ◽  
Energy Partition ◽  
Grinding Fluid

In the grinding process, high temperature in grinding area is generated by the frictional resistance between workpiece and abrasive grains on the grinding wheel cylindrical surface. Grinding fluid application is an optimal option to reduce the thermal effect and crack on the workpiece ground surface. In this paper, a grinding process heat transfer model with various grinding fluid application is introduced based on computational fluid dynamics (CFD) methodology. The effect of specific heat, viscosity, and surface tension of grinding fluid are taken into account. In the model, the grinding contact area is considered as a heating resource. Most of the heat energy is conducted into the workpiece. The rest of the energy is taken away by the grinding wheel, grinding fluid, and chips. How many percentage of the generated heat is conducted into the workpiece is a key issue, namely, the energy partition ratio ε. An energy partition equation is introduced in this paper with the cooling effect of different grinding fluid. Generated heat energy based on the calculation from energy partition equation is applied on the grinding contact area in the heat transfer model.

Investigation of Grinding Fluid Supply Parameters on Workpiece Surface Integrity

2014 ◽  
Vol 1017 ◽  
pp. 458-463
Author(s):  
Shi Chao Xiu ◽  
Xiu Ming Zhang ◽  
Ang Jiang ◽  
Xiao Liang Shi ◽  
Shu Jun Li ◽  
...  
Keyword(s):  
Surface Integrity ◽  
Flow Model ◽  
Fluid Distribution ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Two Phase ◽  
Workpiece Surface ◽  
Grinding Fluid ◽  
Parameters Selection ◽  
Fluid Supply

The grinding heat directly affected workpiece surface in the grinding process and it might produce some defects such as crack and burn. Meanwhile wear debris generated in the grinding process could easily embed grinding wheel blowhole and caused clogging and passivation. So it was particular important to avoid defects and improve the grinding workpiece surface integrity effectively. This paper established an incompressible turbulent fluid spray model based on the study of the existing airflow and the grinding fluid distribution in the grinding zone. Then according to different grinding fluid supply parameters established the two-phase gas liquid spray flow model by using CFD(computational fluid dynamics), simulated and calculated the model, compared the mass flow rate of the grinding fluid flow field with different spray distances, heights, speeds and spray angles in the grinding zone and determined the most reasonable spraying jet position. At the last, through researching on the workpiece surface integrity experiment, it provided an experimental basis to determine the most suitable spray jet position and verify the rationality of supply parameters selection.

scholarly journals Development of a method for applying free kinematics for gear profile grinding

Procedia CIRP ◽  
2021 ◽  
Vol 104 ◽  
pp. 1373-1377
Author(s):  
Christopher Janßen ◽  
Jens Brimmers ◽  
Thomas Bergs
Keyword(s):  
Profile Grinding ◽  
Gear Profile

Investigation of Airflow Field in Grinding Zone Based on FLUENT

2011 ◽  
Vol 189-193 ◽  
pp. 3022-3025
Author(s):  
Shi Chao Xiu ◽  
Jun Di ◽  
Shao Yong Pei
Keyword(s):  
Finite Element Analysis ◽  
High Pressure ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Temperature ◽  
Element Analysis ◽  
Influencing Mechanism ◽  
Grinding Fluid ◽  
The Finite Element Analysis ◽  
Airflow Field

It is necessary to supply enough grinding fluid during grinding process to lower grinding temperature. But, there is little grinding fluid into the contact area actually due to the airflow layer with high pressure around grinding wheel. In this paper, the finite element analysis and simulation on airflow field in the grinding zone is performed based on hydrodynamics. The performance and the influencing mechanism of the airflow field on effective grinding fluid are analyzed further. The research works show that it is important to design the grinding wheel and fluid jet parameters reasonably for increasing the proportion of effective grinding fluid.

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