Small Holes Fabrication on Soda Glass by Self-Elastic Polycrystalline Diamond Tool

2012 ◽  
Vol 516 ◽  
pp. 516-521
Author(s):  
Chung Chieh Cheng ◽  
Dong Yea Sheu
Keyword(s):  
Surface Roughness ◽  
Diamond Tool ◽  
Polycrystalline Diamond ◽  
The Self ◽  
High Quality ◽  
Drilling Tool ◽  
Drilling Tools ◽  
Absorbing Materials ◽  
New Type ◽  
Small Holes

This study describes a novel process to drill small holes in brittle materials such as glass, silicon and ceramic using a self-elastic polycrystalline diamond (PCD) drilling tool. In order to improve the surface roughness and reduce crack of the small holes, a new type of self-elastic PCD drilling tool equipped with vibration absorbing materials inside the housing was developed to fabricate small holes in glass in this study. The self-elastic PCD drilling tools could absorb the mechanical force by the vibration absorbing materials while the PCD tool penetrates into the small holes. Compared to conventional PCD drilling tools, the experimental results show that high-quality small holes drilled in glass can be achieved with cracking as small as 0.02mm on the outlet surface using the self-elastic PCD drilling tool.

A Truing Technique of Flattening Diamond Grains for Fabricating Microstructures with Fine Surfaces

2008 ◽  
Vol 389-390 ◽  
pp. 350-355
Author(s):  
Takeshi Harada ◽  
Takuya Semba
Keyword(s):  
Surface Roughness ◽  
Electrical Discharge ◽  
Diamond Tool ◽  
Electrical Discharge Machining ◽  
Polycrystalline Diamond ◽  
Mesh Size ◽  
Diamond Disk ◽  
Working Surface ◽  
Work Material ◽  
Tool Profile

A truing technique that can be used to shape the tip of an electroformed diamond tool into a hemisphere and flatten diamond grains on the tool working surface at the same level as the bond face was developed. A polycrystalline diamond disk whose top surface roughened by electrical discharge machining was partially flattened by grinding was used as a truer. Diamond grains on the tool working surface were successfully flattened along the hemispherical tool profile when the grains mesh size of #1000 was employed. In addition, a grinding test using glasslike carbon as a work material revealed that a surface roughness of less than 50 nm Rz could be obtained in both cases when moving the tool on contour and scanning paths.

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.

A Study of the Diamond Tools for Grinding Polycrystalline Diamond

2010 ◽  
Vol 126-128 ◽  
pp. 585-590
Author(s):  
Shenq Yih Luo ◽  
J.K. Ho ◽  
Ming Yi Tsai ◽  
Yi Xian Liu ◽  
William Chen
Keyword(s):  
Surface Roughness ◽  
Diamond Tool ◽  
Polycrystalline Diamond ◽  
Lower Percentage ◽  
Depth Of Cut ◽  
Workpiece Surface ◽  
Diamond Tools ◽  
Vitrified Bond ◽  
Grinding Efficiency ◽  
Worn Surface

The purpose of this paper was to investigate the grinding performance of two types of cobalt and vitrified bond diamond tools produced by the hot press for the vertical flat grinding polycrystalline diamond. The worn diamond type and the diamond protrusion observed by the toolmaker or SEM after grinding under two different feed rates of 1 and 5 mm/min and the depth of cut of 2 µm with total depth of 10µm were studied. In addition, the grinding efficiency and the workpiece surface roughness produced were analyzed as well. The experiment results showed that when the feed rate of 1 mm/min during the flat grinding PCD was used, a lower percentage of the good diamond, a higher percentage of flat diamond and pulled-out hole on the worn surface of the cobalt bond diamond tool were obtained. For the vitrified bond diamond tool, the good diamond produced showed a higher percentage and flat grit and pulled-out hole displayed a relatively lower percentage. This may be due to the result of the relatively moderate strength and grit retention of the vitrified bond. Furthermore, the diamond protrusion and the grinding efficiency produced for the vitrified bond diamond tool were better than those for the cobalt bond tool. And the PCD surface roughness obtained was better as well.

scholarly journals Analysis of surface roughness and hardness in titanium alloy machining with polycrystalline diamond tool under different lubricating modes

2014 ◽  
Vol 17 (4) ◽  
pp. 1010-1022 ◽  
Author(s):  
Goutam Devaraya Revankar ◽  
Raviraj Shetty ◽  
Shrikantha Srinivas Rao ◽  
Vinayak Neelakanth Gaitonde
Keyword(s):  
Surface Roughness ◽  
Titanium Alloy ◽  
Diamond Tool ◽  
Polycrystalline Diamond

scholarly journals Machinability of Rolled Aluminum using Advanced Coated Cutting Tools and its Characterization

2019 ◽  
Vol 8 (3) ◽  
pp. 776-783
Keyword(s):  
Surface Roughness ◽  
Cutting Tool ◽  
Diamond Tool ◽  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
Depth Of Cut ◽  
Constant Depth ◽  
Rolled Aluminum ◽  
Polycrystalline Diamond Inserts

Because of multiple properties like higher values of corrosion resistance, formability, weldability along with greater structural utility aluminum alloys are generally gaining more and more demand in industries and household. With this the requirement for searching of higher quality cutting tool to machine aluminum is also growing. Here different cutting tools like MTCVD+TiCN+Al2O3 , MTCVD+TiCN+Al2O3+TiOCN, MTCVD+TiN+TiCN+Al2O3+TiN, PVD AlTiN, cemented carbide (k-10) insert brazed with Polycrystalline Diamond and Polycrystalline Diamond Inserts are being used to machine rolled aluminum in dry condition and then comparative analysis are made. The cutting is of orthogonal type and capstan lathe is used for the same. Under different conditions of cutting the surface roughness along with morphology of chip are analyzed. Under constant depth of cut (doc) along with variable velocities and feed, the turning operation is performed. With SEM and XRD the identification including characterization of cutting tool were also performed. The polycrystalline diamond tool is found to give optimum surface finish, thin type of chip along with mirror like finish during machining operation.

Electroformed Diamond Tool Adaptable to Nanometer Grinding of Cemented Carbide

2012 ◽  
Vol 516 ◽  
pp. 1-6
Author(s):  
Naoko Gohya ◽  
Wan Fu Sun ◽  
Yoshifumi Amamoto ◽  
Takuya Semba
Keyword(s):  
Surface Roughness ◽  
Diamond Tool ◽  
Ground Surface ◽  
Polycrystalline Diamond ◽  
Cemented Carbide ◽  
Laser Machining ◽  
Elastic Contact ◽  
Working Surface ◽  
Tip Radius ◽  
Diamond Disc

An electroformed diamond tool with a tool tip radius of 0.2 mm was developed to achieve a surface roughness of less than 10 nm Rz on a mould made of cemented carbide. A polycrystalline diamond disc with a primary grain size of 0.5 µm and a diameter of 15 mm was used as a truer. A concentric guide groove with a reverse profile relative to the hemispherical tool and a surface roughness of 0.5 µm Rz was preformed on the truer by laser machining and wet lapping. It was verified through a truing test that 93 % of the diamond grains on the tool working surface could be flattened when the tool was placed in elastic contact with a guide groove with a depth of 50 µm. A grinding test revealed that the tool had the potential to efficiently fabricate a ground surface with a roughness of less than 10 nm Rz on cemented carbide with a hardness of 2600 Hv.

Effect of Volume Fraction on Surface Roughness in Turning of Hybrid Metal Matrix (A6061 A1+SiC+Graphite) Composites

2015 ◽  
Vol 766-767 ◽  
pp. 263-268
Author(s):  
M. Kathirvel ◽  
K. Palanikumar
Keyword(s):  
Surface Roughness ◽  
Composite Materials ◽  
Metal Matrix Composite ◽  
Metal Matrix ◽  
Diamond Tool ◽  
Volume Fraction ◽  
Polycrystalline Diamond ◽  
Matrix Composites ◽  
Hybrid Machining ◽  
Graphite Composites

Metal matrix composite materials are finding increased applications in many fields due to their excellent properties. Adding of one more constituent in the metal matrix make the composites hybrid. Machining of these composite materials are important and is different from the conventional materials. In the present investigation, hybrid metal matrix composites is machined by using Polycrystalline Diamond tool and the effect of volume fraction on surface roughness in turning is evaluated and presented in detail.

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