Scribing Characteristics of Glass Plate with Ground PCD Scribing Wheel

2018 ◽  
Vol 12 (5) ◽  
pp. 760-766
Author(s):  
Yusuke Akiyama ◽  
Mutsumi Okada ◽  
Hirofumi Suzuki ◽  
Toshio Fukunishi ◽  
Yoshiyuki Asai ◽  
...  
Keyword(s):  
High Efficiency ◽  
Glass Plate ◽  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
Diamond Wheel ◽  
Precision Machining ◽  
Electric Discharge Machining ◽  
Single Crystal Diamond ◽  
Pcd Tools ◽  
Alloy Metal

Polycrystalline diamond (PCD) tools are widely used for cutting tools because PCD has no crystal orientation and is an isotropic material, it is low in cost, and it is easily machined by electric discharge machining. PCD is sintered from diamond abrasives with an alloy metal, such as cobalt, and it is difficult to reduce the surface roughness and the edge accuracy compared with single crystal diamond. In this study, high efficiency and high precision machining of the PCD wheel were investigated. In the experiments, PCD wheels were ground with a diamond wheel, and the effects of the grinding direction and the load on the tool preciseness and the scribing performance were examined.

Study on Precision Finishing of PCD by Constant-Pressure Grinding and UV-Polishing

2009 ◽  
Vol 407-408 ◽  
pp. 388-391 ◽  
Author(s):  
Mutsumi Touge ◽  
Takayuki Nakano ◽  
Keishi Yamaguchi ◽  
Akihisa Kubota ◽  
Junji Watanabe
Keyword(s):  
Ultraviolet Irradiation ◽  
Constant Pressure ◽  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
Diamond Wheel ◽  
Total Processing Time ◽  
Machined Surface ◽  
Diamond Substrate ◽  
Single Crystal Diamond ◽  
Precision Finishing

Polycrystalline diamond (PCD) has been widely used for various cutting tools and die components making use of its hardness and wear resistance properties. The polishing method of a single crystal diamond substrate and SiC using ultraviolet irradiation was newly developed to obtain mirror-finished surfaces. Due to the long polishing time in this method, a better pre-machined surface is required to shorten the total processing time. In this work, the constant-pressure grinding was performed using a cup type metal-bonded diamond wheel and a constant pressure device. After the good constant-pressure grinding, the PCD was finished by the polishing under the ultraviolet irradiation, and the microroughness was reached to be 0.71 nmRa.

Nanopatterning on Nano-Polycrystalline Diamond and Cubic Boron Nitride Using Focused Ion Beam and Heat Treatment to Fabricate Textured Cutting Tools

2016 ◽  
Vol 874 ◽  
pp. 543-548 ◽  
Author(s):  
Noritaka Kawasegi ◽  
Kazuma Ozaki ◽  
Noboru Morita ◽  
Kazuhito Nishimura ◽  
Makoto Yamaguchi ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Boron Nitride ◽  
Single Crystal ◽  
Focused Ion Beam ◽  
High Efficiency ◽  
Ion Beam ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
Single Crystal Diamond

Texturing on the surface of cutting tools is an effective method to improve the friction and resultant machining performances of the tool. In this study, to fabricate nanotextures on various tools used for precision cutting, a patterning method on nanopolycrystalline diamond and cubic boron nitride tools was investigated using focused ion beam (FIB) irradiation and heat treatment. Patterning was possible using this method, and the patterning characteristics were different from those of single-crystal diamond. This method was more suitable for cutting tools compared with direct FIB machining because of its high efficiency and significantly low affected layer.

Cutting Performance of PCD Tools Improved by Ultraviolet-Ray Irradiation Polishing

2016 ◽  
Vol 874 ◽  
pp. 109-114 ◽  
Author(s):  
Kenta Goto ◽  
Yasuo Izumi ◽  
Takeshi Sakamoto ◽  
Akihisa Kubota ◽  
Mutsumi Touge
Keyword(s):  
Single Crystal ◽  
High Speed ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Fine Powder ◽  
Polycrystalline Diamond ◽  
Cutting Edge ◽  
Polished Surface ◽  
Single Crystal Diamond ◽  
Pcd Tools

The polycrystalline diamond (PCD) is made of sintered diamond fine powder with binder material, and shows clear isotropic characteristics and high toughness without frequent cleavage. As the PCD cutting tools require relatively low tool cost compared with single crystal diamond tools, they have wide applications as the precision cutting tools with the high abrasion resistance. The more sharp or complex shapes of PCD cutting tool are deeply expected even though they have the machining difficulties. In this study, the ultraviolet-irradiation polishing of single crystal diamond substrates developed in our laboratory (abbreviated as UV-polishing in this paper) was applied to realize advanced PCD tools with ultra-sharp or chamfered cutting edges. Firstly, the UV-polishing properties of PCD substrate were investigated, and high-quality polished surface with 2.6 nmRa was obtained. Secondly, the UV-polishing was applied to the precision polishing of the flank face of PCD cutting tool, and an ultra-sharp cutting edge was finally achieved. The chamfered cutting edge with desired angle and width was additionally formed by the UV-polishing to suppress the chipping left on the sharpened cutting edge. The tool wear of chamfered PCD cutting tools could be reduced almost by half to the sharpened tool under high-speed cutting of high silicon-aluminum alloy.

Research on Micro-Size Electrical Discharge Machining Polycrystalline Diamond

2019 ◽  
Vol 943 ◽  
pp. 14-19 ◽  
Author(s):  
Yun Hai Jia ◽  
Jian Mei Guo ◽  
Yan Guo ◽  
Fan Yu
Keyword(s):  
Pulse Duration ◽  
High Efficiency ◽  
Electrical Discharge Machining ◽  
Pulse Discharge ◽  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
Green Manufacturing ◽  
Single Pulse ◽  
Pit Depth ◽  
Thermal Influence

With the demand of modern cutting technology for ‘high efficiency, precise, flexibility and green manufacturing’, polycrystalline diamond materials as cutting tools have been widely used in automobile, aerospace and non-metal processing. Electro-spark erosion is one of the most effective ways to machine polycrystalline diamond materials. Single pulse discharge is one of the research foundations of micro-EDM. Using 2 micron granularity polycrystalline diamond as experiment material, the influence of single pulse discharge technology on the removal efficiency of materials was studied, such as pit radius, pit depth and radius-depth ratio, etc. The experimental results show that, with the extension of the pulse duration, the radius of the discharge pit begins to increase rapidly, then slowly increases, and finally to slow down; while the radius of thermal influence zone increases rapidly and then continues to increase slowly. With the extension of pulse duration, the ratio of pit depth to radius changes within the range of 0.05 ~ 0.25, which shows a downward trend basically.

Cutting Performances of Nano-Polycrystalline Diamond

2012 ◽  
Vol 523-524 ◽  
pp. 105-108
Author(s):  
Katsuko Harano ◽  
Hitoshi Sumiya ◽  
Daisuke Murakami
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
High Hardness ◽  
Direct Conversion ◽  
High Wear Resistance ◽  
Single Crystal Diamond ◽  
Anisotropic Mechanical Properties ◽  
Hard And Brittle Materials

Single-phase (binder-less) nano-polycrystalline diamond (NPD) has been synthesized by direct conversion sintering from graphite under high pressure and high temperature. NPD is characterized by extremely high hardness compared with single crystal diamond (SCD), even at high temperature. In addition, NPD has high wear resistance, no anisotropic mechanical properties, no cleavages, and high thermal stability. These characteristics suggest that NPD has high potential for use in precision cutting tools for various hard works. In order to evaluate the cutting performance of NPD, cutting tests for various cemented carbides were conducted under various conditions and the results compared with those of single crystal diamond (SCD) and conventional polycrystalline diamond containing metal binder (PCD). The results revealed that NPD has outstanding potential for precision cutting and processing of diverse hard and brittle materials.

High-Pressure Synthesis of High-Purity and High-Performance Diamond and cBN Ceramics

2006 ◽  
Vol 45 ◽  
pp. 885-892 ◽  
Author(s):  
Hitoshi Sumiya
Keyword(s):  
High Pressure ◽  
Diffusion Process ◽  
High Purity ◽  
High Performance ◽  
High Efficiency ◽  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
High Hardness ◽  
Secondary Phases ◽  
Fine Grained

High-purity, single-phase polycrystalline diamond and cBN have been successfully synthesized by direct conversion sintering from graphite and hBN, respectively, under static high pressure and high temperature. The high-purity polycrystalline diamond synthesized directly from graphite at ≧15 GPa and 2300-2500 °C has a mixed texture of a homogeneous fine structure (grain size : 10-30 nm, formed in a diffusion process) and a lamellar structure (formed in a martensitic process). The polycrystalline diamond has very high hardness equivalent to or even higher than that of diamond crystal. The high-purity polycrystalline cBN synthesized from high-purity hBN at 7.7 GPa and 2300 °C consists of homogeneous fine-grained particles (<0.5 μm, formed in a diffusion process). The hardness of the fine-grained high-purity polycrystalline cBN is obviously higher than that of single-crystal cBN. The fine microstructure features without any secondary phases and extremely high hardness of the nano-polycrystalline diamond and the fine-grained polycrystalline cBN are promising for applications in next-generation high-precision and high-efficiency cutting tools.

Thinning Silicon Wafer with Polycrystalline Diamond Tools

2009 ◽  
Vol 404 ◽  
pp. 157-163
Author(s):  
Pei Lum Tso ◽  
Cheng Huan Chen
Keyword(s):  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
Wafer Surface ◽  
Depth Of Cut ◽  
Entire Surface ◽  
Machined Surface ◽  
Drill Bits ◽  
Ductile Mode ◽  
Critical Depth Of Cut ◽  
Pcd Tools

Sintered polycrystalline diamond (PCD) compacts are normally used for cutting tools, drill bits and wire dies. A novel application of PCD has been developed to use its entire surface carved to create different patterns which are triangle or square shape loaded with leveled millers that can shave brittle materials in ductile mode. Due to numerous cutting edges formed on the same level of PCD tools, which can be used to thin the wafer surface to achieve both flatness and smoothness of the industrial requirements. SEM has been used to observe the surface and subsurface of the thinned wafer surface. The critical depth of cut between ductile and brittle cutting mode is close to 2 µm in this thinning operation. The damaged layers of machined surface have been observed and studied in this paper.

Manufacturing Process of Terahertz Radar Reflector Based on Ultra-Precision Machining Technology

2015 ◽  
Vol 713-715 ◽  
pp. 633-636
Author(s):  
Di Li ◽  
Song Bao Luo ◽  
Jian Ming Zhang ◽  
Chang Yu Xu ◽  
Chang Tao Pang
Keyword(s):  
Single Point ◽  
Cutting Tools ◽  
Diamond Turning ◽  
Precision Machining ◽  
Diamond Cutting Tools ◽  
Single Crystal Diamond ◽  
Aluminum Sample ◽  
Ultra Precision ◽  
The Cost ◽  
Better Than

This paper presents a technique for processing Terahertz radar reflector by SPDT (Single Point Diamond Turning) based on LODTM (Large Optics Diamond Turning Machine). This technique applies single crystal diamond cutting tools for ultra-precision machining, and thus could obtain high-precision optical mirror, which could be used as the Terahertz radar reflectors. An experiment for aluminum sample had been done to demonstrate the availability of the technique, and a pair of Terahertz radar reflectors were obtained. The precision of the reflectors, detected through precision coordinate measuring technology, was better than the designed requirement. The experiment results showed that Terahertz radar reflectors generated by deterministic ultra-precision machining technique based on LODTM would have advantages in figure accuracy and roughness and so on, which could be helpful to improve the precision and low the cost of Terahertz radar system.

scholarly journals Study of cutting force and tool wear during turning of aluminium with WC, PCD and HFCVD coated MCD tools

2020 ◽  
Vol 7 ◽  
pp. 27
Author(s):  
Sisira Kanta Pattnaik ◽  
Minaketan Behera ◽  
Sachidananda Padhi ◽  
Pusparaj Dash ◽  
Saroj Kumar Sarangi
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
Cutting Force ◽  
Cutting Tools ◽  
Chemical Vapor ◽  
Polycrystalline Diamond ◽  
Machining Process ◽  
Pcd Tool ◽  
Rolled Aluminum ◽  
Pcd Tools

Enormous developmental work has been made in synthesis of metastable diamond by hot filament chemical vapor deposition (HFCVD) method. In this paper, micro-crystalline diamond (MCD) was deposited on WC–6 wt.% Co cutting tool inserts by HFCVD technique. The MCD coated tool was characterized by the scanning electron microscope (SEM), X-ray diffraction (XRD) and micro Raman spectroscopy (μ-RS). A comparison was made among the MCD tool, uncoated tungsten carbide (WC) tool and polycrystalline diamond (PCD) tool during the dry turning of rolled aluminum. The various major tests were conducted such as surface roughness, cutting force and tool wear, which were taken into consideration to establish a proper comparison among the advanced cutting tools. Surface roughness was measured during machining by Talysurf. The tool wear was studied by SEM after machining. The cutting forces were measured by Kistler 3D-dynamometer during the machining process. The test results indicate that, the CVD coated MCD tool and PCD tool produced almost similar results. But, the price of PCD tools are five times costlier than MCD tools. So, MCD tool would be a better alternative for machining of aluminium.

Ultra-Precision Machining of Stainless Steel and Nickel with Single Crystal 4H and 6H Boule SiC

2010 ◽  
Vol 645-648 ◽  
pp. 853-856 ◽  
Author(s):  
Wolfgang J. Choyke ◽  
B. D'Urso ◽  
Fei Yan ◽  
Robert P. Devaty
Keyword(s):  
Stainless Steel ◽  
Single Crystal ◽  
Cutting Tools ◽  
Precision Machining ◽  
Average Roughness ◽  
Flat Surfaces ◽  
Diamond Cutting Tools ◽  
Single Crystal Diamond ◽  
Single Crystal Sic ◽  
Ultra Precision

Ultra-precision machining is dominated by single-crystal diamond cutting tools, and is typically applied to a narrow range of materials, particularly aluminum and copper. Single-crystal SiC can be comparable to some diamonds in hardness and thermal conductivity, while potentially having superior chemical and thermal stability, yet it has not been explored as a cutting tool for ultra-precision machining. We made two cutting tools with single-crystal SiC, one with sharp corners and one with a large circular radius, and used them to cut flat surfaces on two materials, 316 stainless steel and nickel. These materials generally cause unacceptably rapid diamond tool wear. We report the average roughness of the resulting surfaces cut with single-crystal 4H and 6H SiC tools.

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