A Grinding Protocol for the Fabrication of Micro/Meso Aspheric Moulds for Optic Applications

2012 ◽  
Vol 565 ◽  
pp. 111-116
Author(s):  
Han Huang
Keyword(s):  
Tungsten Carbide ◽  
Brittle Materials ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Removal Mechanisms ◽  
Hard And Brittle Materials ◽  
Cemented Tungsten Carbide

This paper summarised our recent results on the development of grinding technologies for the fabrication of aspheric components at micro/meso scales made of cemented tungsten carbide. Based on these results, a grinding protocol was proposed for the fabrication of aspheric moulds. The protocol includes the understanding of deformation and removal mechanisms of hard and brittle materials involved in grinding, the preparation of grinding wheels, the compensation of profiling errors and the optimisation of the grinding process.

scholarly journals Micro-grooving of brittle materials using textured diamond grinding wheels shaped by an integrated nanosecond laser system

2021 ◽  
Author(s):  
Zongchao Geng ◽  
Zhen Tong ◽  
Wenbin Zhong ◽  
Guoqin Huang ◽  
Changcai Cui ◽  
...  
Keyword(s):  
Laser System ◽  
Brittle Materials ◽  
Research Progress ◽  
Nanosecond Laser ◽  
Grinding Wheels ◽  
Diamond Grinding ◽  
Hard And Brittle Materials ◽  
Micro Grooving ◽  
Offset Compensation ◽  
High Flexibility

Abstract The freeform surfaces including both the aspherical and prismatic concave/convex have been widely utilized in optical, electronical, and biomedical areas. Most recently, it is reported that grinding with structured wheels provides new possibility to generate patterns on hard and brittle materials. This paper reports the latest research progress on micro-grooving glass ceramic using laser structured bronze bond diamond grinding wheels. A nanosecond pulse laser is firstly integrated into an ultra-precision machine tool and used for the in-line conditioning of super abrasive grinding wheels, i.e. truing, dressing, and profiling/texturing. Meanwhile, an offset compensation method, considering the shifting depth of focus (DoF) at different laser irradiation position, is proposed to accurately generate various profiles on the periphery of the grinding wheels. Three types of patterns (riblets, grooves, and pillars) are successfully fabricated on the ceramic substrate using the laser textured grinding wheels. The results indicate that the integrated laser system offers high flexibility and accuracy in shaping super abrasive grinding wheels, and the grinding using textured grinding wheels provide a promising solution to generate functional structures on hard and brittle materials.

Technological Possibilities of Low-Temperature Precision Grinding Process when Machining Hard and Brittle Materials

2002 ◽  
Vol 223 ◽  
pp. 149-156 ◽  
Author(s):  
B.I. Batiashvili ◽  
D.S. Butskhrikidze ◽  
G.A. Mamulashvili ◽  
R.S. Turmanidze ◽  
Karl Kromp ◽  
...  
Keyword(s):  
Low Temperature ◽  
Brittle Materials ◽  
Grinding Process ◽  
Precision Grinding ◽  
Hard And Brittle Materials

scholarly journals Effect of the grinding process on the wear of a cemented tungsten carbide cutting insert during turning

Procedia CIRP ◽  
2021 ◽  
Vol 101 ◽  
pp. 174-177
Author(s):  
C.E.H. Ventura ◽  
D.C. Cruz ◽  
V.L. Sordi ◽  
D.I. Suyama
Keyword(s):  
Tungsten Carbide ◽  
Grinding Process ◽  
Cutting Insert ◽  
Cemented Tungsten Carbide

Face Turning of Cobalt-Free Tungsten Carbide Using Nano-Polycrystalline Diamond Tool

2016 ◽  
Vol 1136 ◽  
pp. 245-250
Author(s):  
Akinori Yui ◽  
Takayuki Kitajima ◽  
Kenichiro Yoshitomi
Keyword(s):  
Surface Roughness ◽  
Tungsten Carbide ◽  
Diamond Tool ◽  
Brittle Materials ◽  
Polycrystalline Diamond ◽  
Zinc Dialkyldithiophosphate ◽  
Micro Cutting ◽  
Fluid Surface ◽  
Hard And Brittle Materials ◽  
Mold Life

The use of hard and brittle materials for manufacturing optical parts, such as dies and molds are required in order to extend mold life. Although, cobalt-free tungsten carbide is one of the hardest materials, micro-cutting is very difficult due to its hardness and its brittleness. This paper investigates face turning of cobalt-free tungsten carbide using a nanopolycrystalline diamond [NPD] tool and Zinc dialkyldithiophosphate (ZnDTP) fluid. Surface roughness of the cobalt-free tungsten carbide achieved was 22nmRz, which is far larger than the theoretical value. That is, traditional cutting theory does not directly apply for face turning of cobalt-free tungsten carbide using NPD tool and ZnDTP fluid.

Electrical Discharge Dressing (EDD) of Metal Bonded Diamond Arc Grinding Wheels

2016 ◽  
Vol 1136 ◽  
pp. 412-417 ◽  
Author(s):  
Fei Hu Zhang ◽  
Kai Wang ◽  
Zhong De Liu ◽  
Zhao Kai Ma ◽  
Dian Rong Luan
Keyword(s):  
Electrical Discharge ◽  
Brittle Materials ◽  
Cemented Carbides ◽  
Grinding Wheels ◽  
Electrical Parameters ◽  
Precision Grinding ◽  
Pulse Period ◽  
Hard And Brittle Materials ◽  
Grinding Operations ◽  
Electrical Discharge Dressing

Metal bonded diamond grinding wheels are very important for precision grinding operations of hard and brittle materials especially like ceramics or cemented carbides. But the trueing and dressing problem has affected its wide use. In this paper, a new EDD (Electrical discharge dressing) device was developed for the dressing of metal bonded diamond arc grinding wheels. The EDD experiments were carried out with the new dressing device. The influence of dressing parameters on the dressing efficiency and precision was studied. Experimental results shown that the increase of pulse period and duty period helped improve the dressing efficiency in a certain range. The higher electrical parameters could get better dressing efficiency. The detection results revealed that the error of the arc profile after EDD could reach to around 3μm. mazhaokai2014

A Study on Deformation and Removal Mechanisms of Tungsten Carbide Using Nanoindentation

2007 ◽  
Vol 329 ◽  
pp. 385-390 ◽  
Author(s):  
Han Huang ◽  
Rudy Irwan ◽  
Tsunemoto Kuriyagawa
Keyword(s):  
Mechanical Properties ◽  
Tungsten Carbide ◽  
Material Removal ◽  
Critical Conditions ◽  
Full Potential ◽  
Removal Mechanisms ◽  
Microstructure Of The Material ◽  
Cemented Tungsten Carbide

Nanoindentation was used to study the deformation and removal mechanisms of cemented tungsten carbide. It was found that the microstructure of the material has significant influences on its mechanical properties, which determines the critical conditions for damage-free nanogrinding. The results also indicated that when material removal events occur at nanometric scale, such influences should be taken into account for gaining the full potential of nanogrinding.

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