Modification of Surface Properties on Cemented Carbide Alloys Through Mirror-Quality Finish Grinding

2013 ◽  
Vol 1 (4) ◽  
Author(s):  
Kazutoshi Katahira ◽  
Jun Komotori
Keyword(s):  
Adhesive Strength ◽  
Smooth Surface ◽  
Ground Surface ◽  
Surface Characteristics ◽  
Cemented Carbide ◽  
Grinding Wheel ◽  
Chemical Affinity ◽  
Precision Grinding ◽  
Average Roughness ◽  
Strength Tests

In this study, efficient, high-precision grinding of cemented carbide alloys using a specific grinding wheel was performed, and the ground surface characteristics were investigated in detail. The results showed that final finishing using a chromium-bonded wheel produced an extremely smooth surface with an average roughness Ra of 4 nm. The grinding process produced a chromium- and copper-rich surface layer, as well as a large amount of diffusion of oxygen. Adhesive strength tests using a microscratching method were also carried out on ground substrates coated with diamond-like carbon (DLC) films. The surface ground by the chromium-bonded wheel exhibited superior adhesive strength due to its strong chemical affinity with the DLC film.

Development of Electroplated CBN Wheel with Cemented Carbide Base for Precision Grinding of Compressor Cylinder Vane Slot

2007 ◽  
Vol 329 ◽  
pp. 495-500
Author(s):  
Hang Gao ◽  
W.G. Liu ◽  
Y.G. Zheng
Keyword(s):  
Surface Roughness ◽  
Ground Surface ◽  
Cemented Carbide ◽  
Grinding Wheel ◽  
Precision Grinding ◽  
Base Surface ◽  
Compressor Cylinder ◽  
Cbn Wheel ◽  
Micro Holes ◽  
Ground Surface Roughness

It is experimentally found that existing micro-holes or micro-concaves on the cemented carbide base surface of electroplated CBN wheel is one of important reasons to worsen the combining intensity of the electroplated abrasives layer with the grinding wheel base. It is well solved by sealing the holes or concaves with steam sealing method. Further more the electroplated CBN wheel with cemented carbide base for precision grinding of compressor cylinder vane slot is developed by optimizing the electroplating prescription and process. Productive grinding results show that the ground surface roughness, size precision and the wheel life have reached the advanced index of the same type of wheel imported.

Nano-Topography Distribution on Non-Axisymmetric Aspherical Ground Surface

2011 ◽  
Vol 325 ◽  
pp. 66-71 ◽  
Author(s):  
Nobuhito Yoshihara ◽  
Shin Fujimura ◽  
Naohiro Nishikawa ◽  
Masahiro Mizuno ◽  
Toshirou Iyama
Keyword(s):  
Surface Roughness ◽  
Smooth Surface ◽  
Ground Surface ◽  
Simulation Method ◽  
Grinding Wheel ◽  
Precision Grinding ◽  
Form Accuracy

Both form accuracy and smooth surface is required in precision grinding. And the form accuracy and surface roughness are improved year by year. However, the more the surface roughness becomes smoother, the more the grinding marks become remarkable. The grinding mark deteriorates the accuracy of optical parts. It is found that the vibration of grinding wheel is transcribed to the ground surface and forms the waviness named nano-topography. And the nano-topography causes grinding marks. In this study, relationship between the nano-topography on non-axisymmetric aspherical ground surface and grinding condition is analyzed theoretically to control the distribution of nano-topography. As a result, simulation method of nano-topography distribution is developed.

Precision Grinding of SUS304 Using Metal Bonded CBN Wheel

2007 ◽  
Vol 24-25 ◽  
pp. 261-264 ◽  
Author(s):  
Y. Hasuda ◽  
Y. Suzuki ◽  
Y. Tadokoro ◽  
S. Kinebuchi ◽  
T. Ohashi ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Ground Surface ◽  
Grinding Wheel ◽  
Precision Grinding ◽  
Wear Process ◽  
Cbn Wheel ◽  
Grinding Conditions ◽  
Wear Of Grinding Wheel ◽  
Stock Removal ◽  
Fundamental Experiment

The fundamental experiment of the grinding of the stainless steel using the metal bonded CBN wheel which was excellent in wear resistance was conducted. The most appropriate grinding conditions were obtained by clarifying wear process of grinding wheel and finished ground surface quality. When grinding was carried out up to stock removal 7000mm3/mm, radial wear of grinding wheel %R is 3μm and surface roughness Rz was 0.5μm or less. The grinding ratio Gr becomes about 3000, and long life grinding with little change of surface roughness was possible.

Experimental Study on Ultrasonic Vibration Dressing Wheel

2010 ◽  
Vol 135 ◽  
pp. 260-264
Author(s):  
Dao Hui Xiang ◽  
Xin Tao Zhi ◽  
Guang Xi Yue ◽  
Bo Zhao ◽  
Q.T. Fan
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Ground Surface ◽  
Surface Characteristics ◽  
Axial Direction ◽  
Grinding Wheel ◽  
Workpiece Surface ◽  
Surface Burn ◽  
Grinding Conditions ◽  
Strict Requirement

Excellent wheel dressing technology can ensure the ground surface quality effectively. Because precision machining has a strict requirement on the wheel dressing, the wheel dressing with ultrasonic vibration was adopted, and the device of ultrasonic vibration dressing was also designed in this paper. On the base of analysis mechanism of ultrasonic vibration dressing wheel, the grinding experiment was carried out in different dressing conditions. The surface characteristics of ultrasonic dressing wheel and the influence of different dressing parameters on the workpiece surface quality were studied. Furthermore, the optimal dressing parameters have been obtained. The experiment results indicate that the micro cutting edge of grinding wheel distribute sparsely in circumferential directional but densely in axial direction in the condition of ultrasonic dressing, and it is particular characteristic of ultrasonic dressing. When the dressing and grinding conditions are suitable, the workpiece surface roughness can be reduced, but the conditions are not arbitrary. At the same time, the workpiece surface burn can be effectively reduced, even if the larger grinding depth is used during the grinding process.

Development of High Performance Monolayer Brazed Diamond Grinding Tool for Ceramics

2010 ◽  
Vol 135 ◽  
pp. 388-392
Author(s):  
Bei Zhang ◽  
Hong Jun Xu ◽  
Yu Can Fu ◽  
Hong Hua Su
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Ground Surface ◽  
Precision Machining ◽  
Grinding Wheel ◽  
Precision Grinding ◽  
Diamond Tools ◽  
Before And After ◽  
Grinding Tool ◽  
Ceramic Grinding

This study has developed a new kind of high performance monolayer brazed diamond tool for ceramic grinding. The grit size of the diamond brazed in the grinding wheel surface is 300m, which has never been reported in diamond tools for ceramic precision machining. The experiment has achieved wonderful surface finish of Zirconia workpiece. This does owe to the designed and precision conditioned topography of the new developed grinding wheel. The topography of the grinding wheel before and after dressing has been measured by means of laser triangulation method. Then the Zirconia workpiece has been ground. The obtained Ra value decreases with no spark grinding times and the minimum Ra of the ground surface is 0.11m. The study proved that the brazed large grit diamond tools would realize high efficiency and precision grinding, namely, high performance of ceramic grinding.

The Experiment Research of Precision Grinding of Li-Ti Ferrite with Graphite Grinding Wheel

2010 ◽  
Vol 431-432 ◽  
pp. 322-325
Author(s):  
Bei Zhang ◽  
Hong Hua Su ◽  
Hong Jun Xu ◽  
Yu Can Fu
Keyword(s):  
Surface Quality ◽  
Material Removal ◽  
Removal Rate ◽  
High Surface ◽  
Ground Surface ◽  
Grinding Wheel ◽  
Precision Grinding ◽  
High Surface Quality ◽  
Good Surface ◽  
Good Surface Quality

Li-Ti ferrite used in aviation occasions needs good surface quality. In conventional grinding it is difficult to meet the surface demand. Accordingly, this paper proposed a new grinding process to change the situation. The process employed graphite grinding wheel which is always used in ultra-precision grinding of steel piece. The process can obtain good surface quality and ensure certain material removal rate. The ground surface appearance is nearly mirror-like. The lowest surface roughness of Ra value of the ground surface is 0.05μm in the experiment. The ground surface morphology is made up of spread glazed area and dispersed minute pits. The ductile regime dominates the material removal mechanism and no surface damage is induced in the process. In consideration of the results in the experiment it can be seen that grinding with graphite grinding wheel is a good finishing procedure in ferrite machining because of its obtained high surface quality.

Precision Grinding Characteristics and Process Optimization on YG3 Cemented Carbide

2012 ◽  
Vol 602-604 ◽  
pp. 1971-1974
Author(s):  
Xun Kun Liang ◽  
Zhi Jian He
Keyword(s):  
Surface Roughness ◽  
Process Optimization ◽  
Rotation Speed ◽  
Research Result ◽  
Cemented Carbide ◽  
Grinding Wheel ◽  
Precision Grinding ◽  
Wheel Wear ◽  
Grinding Parameters ◽  
Hard And Brittle Materials

Precision grinding experiment and process optimization of YG3 cemented carbide materials was conducted with various grinding parameters using resin-bonded diamond grinding wheel. Different rotation speed of workpiece, feed rate and grinding depth were chozen in precision cross grinding. Surface roughness was measured for studying the removal mode and grinding charateristics. A set of ideal grinding parameters of YG3 cemented carbide were obtained by changing the process parameters. The research result has guiding significance for reducing the wheel wear and processing costs, improving grinding quality and efficiency while precision grinding hard and brittle materials.

Precision Grinding of High Chromium Steels Using Metal Bonded CBN Wheel

2007 ◽  
Vol 24-25 ◽  
pp. 171-176
Author(s):  
Y. Hasuda ◽  
T. Kato ◽  
R. Meguriya ◽  
Y. Suzuki ◽  
S. Kinebuchi ◽  
...  
Keyword(s):  
Ground Surface ◽  
Surface Characteristics ◽  
Precision Grinding ◽  
High Chromium ◽  
Cbn Wheel ◽  
Abrasive Grains ◽  
Working Surface ◽  
Grinding Ratio ◽  
Cr Steels ◽  
Ground Surface Roughness

In this study, the influences of carbides and alloy additives on ground surface characteristics of several high Chromium (Cr) steels and abrasive grains of working surface were discussed. In the grinding using metal bonded CBN wheel, almost constant values in ground surface roughness and high grinding ratio were shown. 5% Cr steel with Vanadium, 8% Cr steel and 10% Cr steel showed a rougher surface than Cr steels with 3%, 4% and 5% due to the carbide inclusion. The grinding ratio of 5%Cr steel could be raised considerably by adding sulfur to it.

Evaluation of Grinding Wheel Surface Shape on Difference Multiple Helical Dressing Condition

2021 ◽  
Vol 15 (1) ◽  
pp. 57-64
Author(s):  
Gen Uchida ◽  
Takazo Yamada ◽  
Kouichi Ichihara ◽  
Makoto Harada ◽  
Kohichi Miura ◽  
...  
Keyword(s):  
Surface Condition ◽  
Ground Surface ◽  
Surface Characteristics ◽  
Measuring Method ◽  
Surface Shape ◽  
Grinding Wheel ◽  
Wheel Surface ◽  
Dressing Method ◽  
Measurement Results

In the grinding process, a grinding wheel surface is a tool that is directly applied to the workpiece. As the condition of the grinding wheel surface is determined by its dressing conditions, the ability to accurately measure the grinding wheel surface with an applied dressing would enable the prediction of the ground surface characteristics of the workpiece as well as the determination of optimum dressing conditions. Recently, a new dressing method called the multiple helical dressing was proposed, which has led to improvements in the grinding performance. However, there is still no method to quantitatively evaluate the changes in the grinding wheel surface condition caused by multiple helical dressings. In this study, we measured the grinding wheel surface applied with multiple helical dressings using a so-called measured focus position recalculation method to determine whether we can quantitatively evaluate the measured dressing grooves generated on the grinding wheel surface by multiple helical dressings, and the resultant undulated grinding wheel surface shapes. We ground an actual workpiece to demonstrate the effects of changes in the grinding wheel surface shape due to multiple helical dressings on the ground surface of the workpiece. The experimental results show that our proposed measuring method can accurately measure the changes in the grinding wheel surface condition due to multiple helical dressings. We also proposed a method to evaluate the dressing grooves to prove that we can quantitatively evaluate the measurement results of dressing grooves generated by multiple helical dressings. In addition, we evaluated undulated grinding wheel surface shapes as its cylindricities by extracting only the undulation shapes generated by multiple helical dressings. Finally, we performed groove grinding with a grinding wheel applied with multiple helical dressings to reveal the relationship between the ground surface of the workpiece and the grinding wheel surface condition, which demonstrated the effectiveness of multiple helical dressings.

Optimization of Grinding Conditions in Non-Axisymmetric Aspherical Grinding

2014 ◽  
Vol 1017 ◽  
pp. 109-113 ◽  
Author(s):  
Nobuhito Yoshihara ◽  
Tomoharu Nakagawa ◽  
Naohiro Nishikawa ◽  
Masahiro Mizuno
Keyword(s):  
Surface Roughness ◽  
Smooth Surface ◽  
Ground Surface ◽  
Precision Grinding ◽  
Form Accuracy ◽  
Grinding Conditions

Form accuracy and smooth surface is required in precision grinding. And the form accuracy and surface roughness are improved year by year. However, the more the surface roughness becomes smooth, the more the grinding marks become remarkable. The grinding mark deteriorates the uniformity of ground surface. In this study, relationship between the uniformity of non-axisymmetric aspherical ground surface and grinding condition is analyzed theoretically. As a result, it is found that there are optimum grinding conditions.

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