Application and Advance in Super-Hard Tool Material

2011 ◽  
Vol 84-85 ◽  
pp. 228-231
Author(s):  
Jing Su ◽  
Yu Hua Zhang ◽  
Di Wang
Keyword(s):  
High Speed ◽  
High Performance ◽  
Cubic Boron Nitride ◽  
Tool Material ◽  
Polycrystalline Diamond ◽  
High Speed Cutting ◽  
Machining Quality ◽  
Finished Surface ◽  
Materials Used ◽  
Surface Precision

For the excellent properties, super-hard tool material has received much attention from researchers. The development of super-hard tool material for high-speed cutting could brought high machining quality and surface precision. For an engineer, adopt high performance of tool material, for example wearing resistance, high stability of PCD (polycrystalline diamond) and PCBN (poly cubic boron nitride) can get more information for obtaining higher finished surface quality that cannot acquire just by common cutting process. This paper introduces super-hard cutters materials (PCD and PCBN) development, and discusses several material properties. The features of materials used in different cutting fields are given.

Development of Super-Hard Cutter Material

2013 ◽  
Vol 341-342 ◽  
pp. 3-7
Author(s):  
Hui Ying Feng ◽  
Xiao Jing Li
Keyword(s):  
High Speed ◽  
Cubic Boron Nitride ◽  
Tool Material ◽  
Polycrystalline Diamond ◽  
Machining Process ◽  
Main Research ◽  
High Speed Cutting ◽  
Finished Surface ◽  
Materials Used ◽  
Surface Precision

Super-hard tool material is a main research point of mechanical engineering because of excellent performance. The development of technology for high-speed cutting process could enhance the machining quality and surface precision. It is a difficulty thing to get higher finished surface for traditional machining process. However, the super-hard cutter material could enhance the finished performance of tool material. For example, the wearing resistance, high stability of PCD (polycrystalline diamond) and PCBN (poly cubic boron nitride) can get more information for obtaining higher finished surface quality. The author introduces super-hard cutters materials (PCD and PCBN) development, and discusses several material properties. The features of materials used in different cutting fields are discussed.

Development and Application of Super-Hard Cutter Material

2011 ◽  
Vol 480-481 ◽  
pp. 676-680 ◽  
Author(s):  
Ji Bao Liu ◽  
Zheng Fang Shi ◽  
Xiao Jing Li ◽  
Di Wang
Keyword(s):  
Boron Nitride ◽  
Surface Quality ◽  
Material Properties ◽  
High Speed ◽  
High Stability ◽  
Cubic Boron Nitride ◽  
Polycrystalline Diamond ◽  
Cutting Process ◽  
High Speed Cutting ◽  
Finished Surface

The CIMS development and the high-speed cutting has given a higher demands on cutter performance. It is an tremendous tendency of studying excellent wearing resistance and high stability. PCD (polycrystalline diamond) and PCBN (poly cubic boron nitride) can obtain more higher finished surface quality, which cannot acquire by regular cutting process. This study introduces super-hard cutters materials (PCD and PCBN) development, and discusses two kinds of material properties, The features of them used in different cutting fields are given.

High-Speed Finishing of Hard Gear Teeth with cBN-Tipped Hob

2008 ◽  
Vol 2 (5) ◽  
pp. 348-353 ◽  
Author(s):  
Yoji Umezaki ◽  
◽  
Yasutsune Ariura ◽  
Toshio Suzuki ◽  
Ryohei Ishimaru ◽  
...  
Keyword(s):  
Surface Properties ◽  
High Speed ◽  
High Efficiency ◽  
Cubic Boron Nitride ◽  
Cutting Temperature ◽  
Cutting Edge ◽  
Wear Properties ◽  
High Speed Cutting ◽  
Gear Teeth ◽  
Finished Surface

The hobbing finish of hard gear teeth such as case-hardened gears is anticipated for practical use in high efficiency production. We studied wear and finished surface properties in cutting tests using a cubic boron nitride (cBN) hob cutter in high-speed cutting at 900 m/min of case-hardened steel. The cBN content in tip ingredients is related to wear, and tips high in cBN content are superior in wear resistance. The high thermal conductivity of cBN tips helps transfer cutting temperature heat to chips, melting and adhering them to the relief surface. Flaking may occur on the cutting edge but new chipping does not occur although chipping may exist after grinding. Finished surface roughness is influenced by horning on the cutting edge. Round horning leads to a smooth surface. High-speed finishing with cBN-tipped hobs is analyzed in view of cBN tip grinding and finished surface properties, in addition to wear properties.

Sintering of Vitrified Bond CBN Grinding Tool

2007 ◽  
Vol 280-283 ◽  
pp. 1391-1394 ◽  
Author(s):  
Zhi Hong Li ◽  
Yong Hong Zhang ◽  
Y.M. Zhu ◽  
Zheng Fang Yang
Keyword(s):  
High Speed ◽  
High Performance ◽  
High Efficiency ◽  
Sintering Temperature ◽  
Cubic Boron Nitride ◽  
Heating Process ◽  
Initial Oxidation ◽  
Grinding Tool ◽  
Vitrified Bond ◽  
Lower Temperature

Cubic boron nitride(CBN) is a superhard materials with many advantages and many uses. Vitrified bond CBN grinding tool is a promising abrasive tool of high performance used for high speed, high efficiency, high precision grinding with lower grinding cost and less environment pollution. Sintering of vitrified bond CBN grinding tool was investigated in this paper. The results showed that practical sintering temperature of this tool was much lower than the initial oxidation temperature of CBN particle measured by comprehensive thermal analysis. The upper limit of sintering temperature should be determined by taking account of the thermal analyzing results, heating process of CBN and its change in strength and structure. Within the sintering temperature range of the vitrified bond, relatively higher sintering temperature was beneficial to the strength of bond bridge and the holding strength between bond and CBN abrasive particles. CBN tool sintered at relatively lower temperature tended to fracture through the bond bridge, while the one sintered at higher temperature tended to fracture along the boundary between CBN abrasive grain and vitrified bond.

Wear Characteristics of Binder-Less Nano-Polycrystalline Diamond and Cubic Boron Nitride

2014 ◽  
Vol 1017 ◽  
pp. 406-410 ◽  
Author(s):  
Hitoshi Sumiya ◽  
Katsuko Harano
Keyword(s):  
Boron Nitride ◽  
Chemical Reaction ◽  
High Speed ◽  
Single Phase ◽  
Cubic Boron Nitride ◽  
Polycrystalline Diamond ◽  
Wear Characteristics ◽  
Wear Process ◽  
Wear Rates ◽  
Starting Condition

Wear characteristics of binder-less (single-phase) nanopolycrystalline diamond (NPD) and cubic boron nitride (BL-PcBN) were investigated by rubbing them against various ceramics such as SiO2, Si3N4, Al2O3 and SiC. The wear rates of NPD and BL-PcBN against SiO2 and Si3N4 at high speed rubbing (280-360 m/min) at a loading pressure of 55 MPa (starting condition) were considerably high, indicating the main wear process is a chemical reaction. BL-PcBN specimens were found to be worn at much higher (more than ten times) rates than NPD, suggesting that cBN highly reacts with these ceramics in comparison with diamond under the experiment condition.

Research of Technology of Cutting Hardened Steel in HSM

2011 ◽  
Vol 338 ◽  
pp. 701-705
Author(s):  
Xiao Jun Zhu ◽  
Wen Sheng Xia
Keyword(s):  
High Speed ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Tool Material ◽  
Main Tool ◽  
Hardened Steel ◽  
Detection Methods ◽  
Tool Geometry ◽  
High Speed Milling ◽  
Coated Cemented Carbide

The key technology of the cutter that cutting hardened steel was researched by high speed milling machining method. At first ,three cutting elements of high speed milling machining was narratived, and we can obtain the principle of selection of parameters of cutting velocity, feed per tooth, longitudinal cutting depth and cutting width of axial, etc. With HSM ,we discussed the performance and selection points of tool material of coated cemented carbide, ceramic, cubic boron nitride , synthetic diamond and so on, and obtained the effect of the main tool geometry for the cutting process in HSM. The second, it analysised type and reason of damage of high speed cutting tools, and introduced three detection methods of tools. Finally, it was summarized and concluded.

Materials Formation Mechanism and Experimental Verification of Micron Long Fiber

2011 ◽  
Vol 179-180 ◽  
pp. 49-54
Author(s):  
Chun Mei Yang ◽  
Yan Ma
Keyword(s):  
High Speed ◽  
Grip Force ◽  
Pure Shear ◽  
Wood Fiber ◽  
Cutting Speed ◽  
Tool Material ◽  
Reducing Power ◽  
Improved Method ◽  
High Speed Cutting ◽  
Wood Grain

In the paper the theory of cutting wood fiber on micron-level has been put forward, that is the cutting power of micron flake wood fiber is much smaller than the mechanical power consumed by grinding. Therefore, the manufacture method for micron flake wood fiber is a kind of way of materials preparation, which can economize energy, decrease in consumption and pollution. From the theoretical analysis, only a reasonable cutting-arrangement on direction can significantly reduce the power. So in the condition of reducing power, relying on pure shear to fracture fibers in tissue is the best effort, at the same time through the vertical ultra-high-speed cutting in grain, the micron filament fibers will be cut out. The influences produced by various factors for the formation of flake fibers have been verified through testing, including the improved tool material, the wood grain, the cutting speed and the improvements for locating specimen.Through the improved method for sluggish wood-fiber cutting, not only does this method reduce power consumption, but also decrease the probability of fiber cut off and substantial increase fiber’s length and quality. Moreover, after these flake fibers having been rescheduled, the elastic modulus of fiber MHFB hot pressed out can reach 5171Mpa, and the grip force of that can reach 1933N.

scholarly journals Advances in the Whipple Shield Design and Development:

2021 ◽  
Author(s):  
A. Pai ◽  
R. Divakaran ◽  
S. Anand ◽  
S. B. Shenoy
Keyword(s):  
High Speed ◽  
High Performance ◽  
Primary Objective ◽  
Metallic Foams ◽  
First Line ◽  
Fiber Metal ◽  
Materials Used ◽  
Whipple Shield ◽  
Shield Design ◽  
Primary Impact

AbstractSafety of satellites as well as spacecrafts during space missions is a primary objective to preserve the physical and virtual assets onboard. Whipple shields belong to the class of protective equipment provided on the surface of the spacecrafts and satellites, to sustain impacts from the ultra-high speed debris, which can otherwise cause considerable damage to the corresponding structures. Recent works on whipple shields are focussed on determining the response of different geometrical arrangements and material properties under hyper-velocity impact at projectile speeds of 3-18 km/s. Advances in the whipple shield design include integrated and mechanised models employing high performance materials like fiber-metal laminates ensuring better operational capability. The forward bumper of the whipple shield is the first line of defence as it regulates the state of projectile after the primary impact. Use of aluminium alloys for front bumpers is popular, owing to their lightweight and strength characteristics. The advances for the front bumper have seen usage of ceramic, metallic foams, and super composite mixtures, which resulted in enhanced performance, durability and safety of the whipple shields. This work is a comprehensive coverage of the latest materials used for whipple shields, their performance characterization—both experimental and theoretical, and applications.

Improvement of Conventional Polycrystalline Diamond Composites by Nanodiamond Incorporation

2012 ◽  
Vol 727-728 ◽  
pp. 1045-1047
Author(s):  
Ana Lúcia Diegues Skury ◽  
Guerold Sergueevitch Bobrovinitchii ◽  
Sérgio Neves Monteiro ◽  
Marcia G. de Azevedo
Keyword(s):  
Plastic Deformation ◽  
High Speed ◽  
Superhard Material ◽  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Speed Cutting ◽  
Diamond Particles ◽  
New Generation

Polycristalline diamond composites (PDC) obtained by sintering of micro sized diamond particles together with silicon as binder is a conventional superhard material for high speed cutting tools. nanosized dispersed diamond particles have been recently used as precursor for a new generation of superhard composites. In the present work, PDCs were produced by sintering at high pressure and high temperature using a mixture of micro and nanosized diamond particles for optimized compactation. The values of density and hardness as well the results of X-ray diffraction suggest a plastic deformation of the larger diamond particles. The compression strength of these composites was found to be close to that of natural diamonds.

scholarly journals Real-Time Simulation of Force Parameters for Diagnostics of Ceramic Tool Condition During Milling of High-Hardness Steel Parts

2019 ◽  
Vol 224 ◽  
pp. 05004
Author(s):  
Marina A. Volosova ◽  
Vladimir D. Gurin ◽  
Anton E. Seleznev ◽  
Leonid E. Shvartsburg ◽  
Mariuch Jenek
Keyword(s):  
Real Time ◽  
High Speed ◽  
High Performance ◽  
Cutting Tools ◽  
Tool Material ◽  
High Hardness ◽  
Ceramic Materials ◽  
Hardened Steels ◽  
Time Simulation ◽  
Wide Range

Cutting ceramics is a high-performance tool material for high-speed machining of hard steels and alloys. Ceramic materials have high hardness and heat resistance in a wide range of temperatures, as well as chemical passivity in relation to most of the workpieces. However, the wider application of ceramic cutting tools is limited due to the low reliability - unpredictable fragile fracture of the cutting edge in different periods of operation. The study discusses mathematical simulations of force parameters in the milling of hardened steels using ceramic cutting tools. The simulation results were used to develop a system for the metalworking technological system state diagnostics. Mathematical software for calculations of the set of force parameters through computer simulations with taking into account the tool wear has been developed. The developed system allows calculating and graphically displaying a set of force parameters appearing during face milling of hardened steels in the real-time.

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