Pulse Dressing in Creep Feed Grinding

1989 ◽  
Vol 203 (1) ◽  
pp. 51-55
Author(s):  
S M Rezaei ◽  
T R A Pearce ◽  
T D Howes
Keyword(s):  
Turbine Blades ◽  
Grinding Wheel ◽  
Grinding Forces ◽  
Dressing Method ◽  
Form Accuracy ◽  
Creep Feed Grinding ◽  
Creep Feed ◽  
Nickel Base

Machining of the roots and shrouds of turbine blades is normally performed by continuous dress creep feed grinding. In this process, the grinding wheel is continuously dressed during the grinding operation, maintaining constant grinding forces and form accuracy. However, continuous-dressing has incurred higher wheel usage. In the tests described in this paper, creep feed grinding of nickel-base alloys was initially performed by continuous dressing to determine the burn barrier and the optimum dresser infeed rate. Pulse dressing, whereby the wheel is kept sharp by a series of dressing pulses, was then applied throughout the grinding cycle in such a way that the grinding forces were kept below the burn barrier. It was shown that wheel usage was reduced by a factor of two with the pulse dressing method. The effect of different grinding coolants under continuous and pulse dressing conditions is also discussed.

Finite Element Simulation of Axial Creep-Feed Grinding Engineering Ceramics Based on ANSYS/LS-DYNA

2012 ◽  
Vol 472-475 ◽  
pp. 927-931
Author(s):  
Xin Li Tian ◽  
Fu Qiang Li ◽  
Ya Tao Mao ◽  
Bao Guo Zhang ◽  
Jian Quan Wang
Keyword(s):  
Grinding Force ◽  
Grinding Forces ◽  
Engineering Ceramics ◽  
Creep Feed Grinding ◽  
Creep Feed ◽  
Element Simulation ◽  
Grinding Conditions ◽  
Grinding Mechanism ◽  
Single Grain ◽  
Diamond Grain

Introducing the grinding mechanism of axial creep-feed grinding ceramics with a single diamond grain. Establishing the simulation model of a single grain grinding engineering ceramics by axial creep-feed grinding and analyzing the simulation results of the grinding force in the X,Y,Z axis. Finally, the impacts of the wheel speed, axial feed rate and workpiece speed upon grinding forces were discussed by simulating the single diamond abrasive grinding process under different grinding conditions.

The Application of Enhanced Cooling Technology to Grinding Process

2013 ◽  
Vol 442 ◽  
pp. 36-39
Author(s):  
Ke Ma
Keyword(s):  
Heat Transfer ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Temperature ◽  
Creep Feed Grinding ◽  
Creep Feed ◽  
Surface Burning ◽  
New Type ◽  
Cooling Technology ◽  
The Comparative Study

An experimental study was performed to analyze the feasibility of heat pipe cooling in creep feed grinding applications. A new type of grinding wheel is developed to enhance the heat transfer of the grinding contact zone then decrease the grinding temperature. The performance of the new type grinding wheel was evaluated by measuring the grinding temperature when it was creep feed grinding the Ti-6Al-4V Alloy and the experimental results were compared with an ordinary grinding wheel. Results of the comparative study indicated that the use of enhanced cooling technology in a grinding wheel can decrease the grinding temperature significantly thus avoid the surface burning in grinding.

Grinding Force in Creep Feed Grinding of Titanium Alloy with Monolayer Brazed CBN Wheels

2012 ◽  
Vol 565 ◽  
pp. 94-99 ◽  
Author(s):  
Chang Yong Yang ◽  
Jiu Hua Xu ◽  
Wen Feng Ding
Keyword(s):  
Titanium Alloy ◽  
Boron Nitride ◽  
Cubic Boron Nitride ◽  
Grinding Force ◽  
Grinding Forces ◽  
Specific Grinding Energy ◽  
Creep Feed Grinding ◽  
Creep Feed ◽  
Force Ratio ◽  
Composite Filler

In this paper, grinding forces of titanium alloy Ti-6Al-4V are measured during creep feed grinding with brazed cubic boron nitride (CBN) wheels. The effects of process parameters on grinding force, force ratio and specific grinding energy are investigated in detail. The grinding force is low and force ratio is about 1.5, and the specific grinding energy of titanium alloys Ti-6Al-4V is about 65J/mm3. Also, CBN wheels brazed with composite filler of Ag-Cu-Ti and 0.5wt.% lanthanum show better grinding performance than the counterpart brazed with Ag-Cu-Ti filler in this investigation.

The Morphology Analysis of Axial Creep-Feed Grinding about Engineering Ceramics with a Small Grinding Wheel

2012 ◽  
Vol 452-453 ◽  
pp. 66-71 ◽  
Author(s):  
Fang Guo ◽  
Xin Li Tian ◽  
Jian Quan Wang ◽  
Xiu Jian Tang ◽  
Ya Tao Mao ◽  
...  
Keyword(s):  
Brittle Fracture ◽  
Damage Mechanism ◽  
Ceramic Materials ◽  
Grinding Wheel ◽  
Morphology Analysis ◽  
Creep Feed Grinding ◽  
Creep Feed ◽  
The Matrix ◽  
Fracture Damage ◽  
Brittle Fracture Damage

The plastic deformation and brittle fracture damage remained within a certain depth of the abrasive surface of ceramic materials during axial creep feed grinding process, which included much information about damage mechanism and removal mechanism of ceramic materials. The surface morphology analysis showed that the brittle fracture was the main removal mode of grinding surface in addition to some micro-cracks in the affected layer, and cracks were not found in the matrix. Compared with general grinding, only the surface deterioration layer is thicker than general grinding surface, and there is no obvious damage to the workpiece

Effects of Grinding Parameters on Creep Feed Grinding

2013 ◽  
Vol 658 ◽  
pp. 255-258
Author(s):  
X.F. Bi
Keyword(s):  
Contact Length ◽  
Grinding Wheel ◽  
Workpiece Surface ◽  
Working Zone ◽  
Grinding Performance ◽  
Creep Feed Grinding ◽  
Grinding Parameters ◽  
Creep Feed ◽  
High Depth

Creep feed grinding can obtain an excellent grinding performance for its creep feed with high depth of cutting. However the large contact length and large feed result in large amount of heat accumulating in working zone and cause burn on workpiece surface. A series of grinding tests are performed to obtain burn variation with grinding parameters using different grinding wheel and workpiece in this paper. Grinding energy is also recorded and used to evaluate the influence of grinding parameter on burn.

Research on Mechanism of Ultrasonic Assisted Creep Feed Grinding Ceramic Blade Surface

2010 ◽  
Vol 42 ◽  
pp. 166-169 ◽  
Author(s):  
Jian Xin Zheng
Keyword(s):  
Static Load ◽  
Movement Analysis ◽  
Difficult Problem ◽  
Grinding Wheel ◽  
Blade Surface ◽  
Creep Feed Grinding ◽  
Creep Feed ◽  
Ultrasonic Assisted ◽  
Contour Evolution ◽  
Surface Precision

Technology of NC-contour evolution ultrasonic assisted creep feed grinding (NC-CEUACFG) blade surface was put forward to solve the difficult problem of machining ceramic blade surface. The static load on the grinding wheel and the influence of the rigidity of the grinding wheel on the surface precision were studied combined with the movement analysis between the blade and grinding wheel in the process of NC-CEUACFG ceramic blade surface, and the physical model of static load may explain the decrease of grinding force and increase of the relative rigidity of the grinding wheel in NC-CEUACFG in theory. The primary experiment of NC-CEUACFG blade surface was carried out according to the experimental results of previous optimized process parameters, and the integral impeller was machined directly in the blank material of Al2O3 ceramic, which indicated the application prospect of such technology.

Modeling and Simulation of Single Abrasive-Grain Cutting Process in Creep Feed Grinding

2016 ◽  
Vol 693 ◽  
pp. 1241-1246 ◽  
Author(s):  
Zhen Guo Nie ◽  
Gang Wang ◽  
Yong Liang Lin ◽  
Xiang Su ◽  
Yi Ming Rong
Keyword(s):  
Modeling And Simulation ◽  
High Speed ◽  
Influence Factors ◽  
Simulation Method ◽  
Maximum Temperature ◽  
Grinding Forces ◽  
Abrasive Grain ◽  
Creep Feed Grinding ◽  
Creep Feed ◽  
Single Grain

Single abrasive-grain cutting is the key research point in grinding process. Because of the narrow space and quick velocity, modeling and simulation method is an approach way to study the single grain cutting. This paper studied the distribution of flow stress and plastic strain, the temperature field near cutting grain. Then experiment was conducted to measure the cutting forces in single grain cutting test. The validation shows good correctness and accuracy of FEA model. Then orthogonal simulation test was carried out to research the influence factors for the grinding forces and temperature distribution. It is found that creep feed grinding has a large grinding forces than high speed grinding in the grain scales. But the maximum temperature value is affected both by depth and speed distinctly.

scholarly journals An Analysis of Electroplated cBN Grinding Wheel Wear and Conditioning during Creep Feed Grinding of Aeronautical Alloys

Metals ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 350 ◽  
Author(s):  
Gorka Vidal ◽  
Naiara Ortega ◽  
Héctor Bravo ◽  
Mirentxu Dubar ◽  
Haizea González
Keyword(s):  
Grinding Wheel ◽  
Wheel Wear ◽  
Grinding Wheel Wear ◽  
Creep Feed Grinding ◽  
Creep Feed ◽  
Cbn Grinding Wheel
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