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.

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.

Ultrasonic Vibration Assisted Grinding of Microstructures on Binderless Tungsten Carbide (WC)

2014 ◽  
Vol 625 ◽  
pp. 475-479 ◽  
Author(s):  
Bing Guo ◽  
Qing Liang Zhao ◽  
Yan Hou ◽  
Cheng Ge ◽  
Xin Yu
Keyword(s):  
Surface Roughness ◽  
Tungsten Carbide ◽  
Ultrasonic Vibration ◽  
Ground Surface ◽  
Precision Grinding ◽  
Form Accuracy ◽  
Grinding Method ◽  
Edge Radius ◽  
Microstructured Surfaces ◽  
Ultrasonic Vibration Assisted Grinding

Microstructured optical elements made of glass are generally replicated by hot pressing with super-hard materials, such as binderless tungsten carbide (WC) and precision ceramic. However, in grinding of microstructures, problems frequently occur in terms of rough ground surface, chipping and rounding of micro-structures edges when compared to conventional grinding. In order to overcome these technological constraints, a promising precision grinding method for microstructured surfaces that applies ultrasonic vibration to improve the surface quality, and protect the edges and tips of microstructured surfaces is presented. The experimental investigation of ultrasonic vibration assisted grinding of microstructures on binderless WC is researched. The effects of ultrasonic vibration on surface roughness, form accuracy and edge radius were analyzed. The morphology of surface and array edges was examined with a scanning electron microscope (SEM), while the surface roughness was measured by a laser interferometer. And a contact probe profilometer was used to assess the form of array and radius of microstructured edges. Experimental results showed that the application of ultrasonic vibration leads to significant improvements of the surface roughness and edges of microstructures compared with traditional precision grinding processes. A micro cylinder lens array of binderless WC with surface roughness of 78nm and edge radius of less than 1μm was obtained. The novel grinding method is feasible and applicable in machining higher form accuracy microstructures.

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.

An Experimental Investigation of Optimal Grinding Condition for Aspheric Surface Lens Using Full Factorial Design

2007 ◽  
Vol 329 ◽  
pp. 27-32 ◽  
Author(s):  
Seung Yub Baek ◽  
Jung Hyung Lee ◽  
Eun Sang Lee ◽  
H.D. Lee
Keyword(s):  
Surface Roughness ◽  
Ground Surface ◽  
Diamond Wheel ◽  
Aspheric Surface ◽  
Precision Grinding ◽  
Spherical Lens ◽  
Ultra Precision ◽  
Ground Surface Roughness ◽  
Grinding System ◽  
Micro Lens

To enhance the precision and productivity of ultra precision aspheric surface micro lens, the development of ultra-precision grinding system and process for the aspheric surface micro lens are described. In this paper, an ultra-precision grinding system for manufacturing the aspheric surface micro lens was developed by considering the factors affecting the grinding surface roughness and profile accuracy. This paper deals with the mirror grinding of an aspheric surface micro lens by resin bonded diamond wheel and with the spherical lens of BK7. The optimization of grinding conditions with respect to ground surface roughness and profiles accuracy is investigated by design of experiments.

Effect of Ground Surface Roughness of Tool on Adhesion Characteristics of PVD Coating

2010 ◽  
Vol 126-128 ◽  
pp. 609-614 ◽  
Author(s):  
Masahiro Furuno ◽  
Koichi Kitajima ◽  
Yousuke Tsukuda ◽  
Takeshi Akamatsu
Keyword(s):  
Surface Roughness ◽  
Smooth Surface ◽  
Ground Surface ◽  
Scratch Testing ◽  
Coating Adhesion ◽  
Pvd Coating ◽  
Ground Surface Roughness

This study investigated adhesion of coatings on a grinding surface. This was carried out using scratch testing as a function of surface roughness. Three types of coatings were explored: TiAlN, CrSiN and TiSiN. With smaller surface roughness, the coating adhesion showed a tendency to become stronger. In particular, in the case of surface roughness under 2 micrometers for a coating, the coating adhesion was good. Specifically, the CrSiN coating yielded a very smooth surface.

Effect of the Grain Depth of Cut on Cross Sectional Profile - Theoretical Analysis of Ground Surface Roughness

2012 ◽  
Vol 565 ◽  
pp. 28-33
Author(s):  
Nobuhito Yoshihara ◽  
Hiroaki Murakami ◽  
Naohiro Nishikawa ◽  
Masahiro Mizuno ◽  
Toshirou Iyama
Keyword(s):  
Surface Roughness ◽  
Ground Surface ◽  
Depth Of Cut ◽  
Cross Sectional ◽  
Grinding Conditions ◽  
Cross Sectional Profile ◽  
Fundamental Research ◽  
Sectional Profile ◽  
Ground Surface Roughness ◽  
The Relationship

Roughness is important criterion of ground surface. When the surface roughness is demanded to be smooth, it is required to make the grinding conditions optimum. To optimize the grinding conditions, relationship between grinding conditions and ground surface roughness must be known. Therefore, it has been attempted to reveal the effect of grinding conditions on the roughness of ground surface over the years. From previous researches, it becomes possible to estimate the ground surface roughness with statistical grinding theory. However, there are some parameters, such as wheel depth of cut and distribution of abrasive grain, are not factored in the theory. In this paper, fundamental research on cross sectional profile is carried out to consider the relationship between the wheel depth of cut and ground surface roughness.

Characterization of ELID-Ground Granite Surfaces

2005 ◽  
Vol 291-292 ◽  
pp. 127-132 ◽  
Author(s):  
Jian Yun Shen ◽  
Wei Min Lin ◽  
Hitoshi Ohmori ◽  
Xi Peng Xu
Keyword(s):  
Surface Roughness ◽  
Smooth Surface ◽  
Ground Surface ◽  
Grinding Process ◽  
Mineral Components ◽  
Grinding Machine

In the present study, natural granites were ELID ground with metal-resin bonded diamond wheels on a lap-grinding machine to achieve smooth surface. The surface roughness during the grinding process and final glossiness were examined to describe the formation of finely finished granite surfaces. According to the detailed micro-observation of ground surfaces, it can be concluded that natural granite surface on the main mineral components can be smoothly finished with ELID lap grinding. However, the appearance of natural defects and residual fracture on the ground surface lead to the scattered surface roughness, and restrict the improvement of surface glossiness.

The Influence of Cutting Fluid Concentration on Surface Integrity of VP80 Steel and the Influence of Cutting Fluid Flow Rate on Surface Roughness of VPATLAS Steel After Grinding

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Raphael Lima de Paiva ◽  
Rosemar Batista da Silva ◽  
Mark J. Jackson ◽  
Alexandre Mendes Abrão
Keyword(s):  
Surface Roughness ◽  
Flow Rate ◽  
Surface Integrity ◽  
Ground Surface ◽  
Cutting Fluid ◽  
Depth Of Cut ◽  
Fluid Concentration ◽  
Grinding Conditions ◽  
Temperature Levels ◽  
Grinding Operations

The application of cutting fluid in grinding operations is crucial to control temperature levels and prevent thermal damage to the workpiece. Water-based (emulsions and solutions) coolants are used in grinding operations owing to their excellent cooling capability and relatively lower cost compared to neat oils. However, the cutting fluid efficiency is not only dependent on its type, but also on other parameters including its concentration and flow rate. In this context, this work aims to analyze the influence of the coolant concentration and flow rate on the grinding process. Two different workpiece materials for the production of plastic injection moulds were machined: VP80 and VPATLAS steel grades. Six grinding conditions (combinations of depth of cut values of 5, 15, and 25 μm with coolant concentration of 3% and 8%, respectively) were employed in the former, while two grinding conditions were used for the latter. The output parameter used to assess the influence of coolant concentration and flow rate on the grinding operation focused on the integrity of the workpiece materials (surface roughness and microhardness below the ground surface). The results showed that the surface integrity of VP80 after grinding was more sensitive to depth of cut than to cutting fluid concentration. Furthermore, the highest coolant concentration outperformed the lowest one when grinding under more severe conditions. With regard VPATLAS steel, no influence of the coolant flow rate on surface roughness was observed.

Dressing of Monolayer Brazed Diamond Wheel for Grinding Li-Ti Ferrite

2010 ◽  
Vol 126-128 ◽  
pp. 995-1000 ◽  
Author(s):  
Hong Hua Su ◽  
Yu Can Fu ◽  
Jiu Hua Xu ◽  
Wen Feng Ding ◽  
Hong Jun Xu
Keyword(s):  
Surface Roughness ◽  
Material Removal ◽  
Removal Rate ◽  
Ground Surface ◽  
Diamond Wheel ◽  
Substantial Improvement ◽  
Precision Grinding ◽  
High Roughness ◽  
Grinding Operations ◽  
Ground Surface Roughness

The monolayer brazed diamond tools have recently been used increasingly in hard-brittle materials grinding because of their excellent grinding performances as long tool life, high material removal rate and large inter-grit chip space, etc. However, they possess an inherent shortcoming of the high roughness of the grinding surface. This work is an attempt to reduce the over-protruded grits of the monolayer brazed diamond wheel so that precision grinding operations can be executed effectively. In this investigation, the monolayer brazed diamond wheels with regular distribution pattern of grit have been dressed by a special conditioning process and used in precision grinding experiments on Li-Ti ferrite. The outcome of this attempt appeared highly encouraging. A substantial improvement of the ground surface roughness could be achieved with the dressed monolayer brazed diamond wheels.

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