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.

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 Grinding Brittle Material with Pattern-Dressed Wheel

2016 ◽  
Vol 861 ◽  
pp. 14-19
Author(s):  
Pei Lum Tso ◽  
Weng Hong Lin
Keyword(s):  
Contact Area ◽  
Brittle Materials ◽  
High Hardness ◽  
Diamond Wheel ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Specific Grinding Energy ◽  
Diamond Grinding ◽  
Selection Parameters

The high hardness of brittle materials always make it hard to machine with traditional grinding wheels. Conventionally a diamond grinding wheels was used to improve the poor processing capability. Usually the specific grinding energy had been used as an indicator of machinability. According to its definition, the specific grinding energy increases with the active contact area of the grinding wheel decreases. In other words, reducing the surface contact area of the grinding wheel can enhance the specific grinding energy effectively. Conditioning grooves on grinding wheels not only enhance the specific grinding energy, but also achieve the effect of reducing the heat dissipated during the grinding processes. With the proper selection parameters, the high cost of diamond grinding wheel may be replaced by less expensive conventional green carbon and aluminum oxide wheel. In this studies, the relationship between the surface topography of grinding wheels and the grinding capability of brittle materials was investigated. The results show that, the traditional grinding wheel dressing properly while the depth of cut less than 20μm with the rhombic pattern and the depth of cut more than 20μm with the groove-like pattern can grind the brittle materials as good as using diamond wheel.

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.

Grindability of Micro Pyramid-Structured Surface for Various Hard and Brittle Materials

2010 ◽  
Vol 126-128 ◽  
pp. 855-860
Author(s):  
Jin Xie ◽  
Y.X. Lu ◽  
Y.W. Zhuo
Keyword(s):  
Aspect Ratio ◽  
Brittle Materials ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Structured Surface ◽  
Diamond Grinding Wheel ◽  
Tool Paths ◽  
Diamond Grinding ◽  
Sic Ceramics ◽  
Hard And Brittle Materials

A novel grinding approach of micro pyramid-structured surface is proposed by using a 60º V-tip of #600 diamond grinding wheel in CNC system. The research objective is to understand the micro grindability of various hard and brittle materials including quartz glass, silicon, SiC ceramics and WC alloy. First, a CNC mutual-wear truing approach was developed to sharpen the wheel V-tip; then, the wheel V-tip was employed to pattern the micro pyramidal array on workpiece surface along CNC tool paths; finally, the machined micro-structured surface and its form accuracy and aspect ratio were investigated. It is shown that this CNC mutual-wear truing approach can not only produce a V-shaped diamond grinding wheel, but also sharpen the diamond grain edges on the wheel V-tip. This wheel V-tip may be used to machine the micron-scale pyramid arrays on silicon, SiC ceramics and WC alloy surfaces with CNC level reticulated cross tool paths, the depth of cut of 1 m and on-machine V-tip form-truing process. Although the average form error of machined micro-structured surface is very small, its pyramidal tops and groove bottoms appear very large form errors, which are dominated by the wheel V-tip sharpness and the grinding conditions, respectively. This leads to a decrease in the aspect ratio by about 38%, 30% and 14% in contrast to the ideal one of 0.87 for silicon, SiC ceramics and WC alloy, respectively.

Surface and Subsurface Integrity of Glass-Ceramics Induced by Ultra-Precision Grinding

2016 ◽  
Vol 1136 ◽  
pp. 497-502 ◽  
Author(s):  
Bo Zhao ◽  
Shang Gao ◽  
Ren Ke Kang ◽  
Xiang Long Zhu ◽  
Dong Ming Guo
Keyword(s):  
High Surface ◽  
Glass Ceramics ◽  
Subsurface Damage ◽  
Grinding Wheels ◽  
Precision Grinding ◽  
Grain Sizes ◽  
Diamond Grinding ◽  
Hard And Brittle Materials ◽  
Ultra Precision ◽  
Damage Depth

Ultra-precision grinding is widely used in machining of the hard and brittle materials due to its high surface accuracy and machining efficiency. However, grinding inevitably brings about surface and subsurface damage that needs to be removed by the polishing processes. This study investigated the surface and subsurface integrity of glass-ceramics induced by ultra-precision grinding. The characteristics of surface roughness, surface topography and subsurface damage depth of ground glass-ceramics with diamond grinding wheels with different grain sizes were presented and compared. Discussion was also provided to explore corresponding reasons of surface and subsurface integrity induced by diamond grinding wheels with different grain sizes.

Surface and Sub-Surface Integrity of Ultra- Machined BK7 Using Fine and Coarse Grained Diamond Wheels

2007 ◽  
Vol 359-360 ◽  
pp. 234-238 ◽  
Author(s):  
Qing Liang Zhao ◽  
Bo Wang ◽  
Ekkard Brinksmeier ◽  
Otmann Riemer ◽  
Kai Rickens ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Integrity ◽  
High Surface ◽  
Coarse Grained ◽  
Nanometer Scale ◽  
Grinding Wheels ◽  
Fine Grained ◽  
Optical Glasses ◽  
Diamond Grinding ◽  
Surface Damages

This paper aims to evaluate the surface and sub-surface integrity of optical glasses which were correspondingly machined by coarse and fine-grained diamond grinding wheels on Tetraform ‘C’ and Nanotech 500FG. The experimental results show that coarse-grained diamond grinding wheels are capable of ductile grinding of optical glasses with high surface and sub-surface integrity. The surface roughness values are all in nanometer scale and the sub-surface damages are around several micros in depth, which is comparative to those machined by fine-grained diamond wheels.

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