Cutting performance of cubic boron nitride-coated tools in dry turning of hardened ductile iron

2020 ◽  
Vol 56 ◽  
pp. 158-168 ◽  
Author(s):  
Luqiang Tu ◽  
Shuai Tian ◽  
Feng Xu ◽  
Xue Wang ◽  
Chenhui Xu ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Ductile Iron ◽  
Cubic Boron Nitride ◽  
Cutting Performance ◽  
Dry Turning ◽  
Coated Tools

On the cutting force of micro-textured polycrystalline cubic boron nitride cutting tool for powder metallurgy materials

2020 ◽  
Vol 12 (7) ◽  
pp. 168781402093849
Author(s):  
Haidong Yang ◽  
Zhengguang Han ◽  
Xiquan Xia ◽  
Qidong Wang ◽  
Juchen Zhang ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Boron Nitride ◽  
Cutting Force ◽  
Cutting Forces ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Cutting Performance ◽  
Polycrystalline Cubic Boron Nitride ◽  
Texture Parameters ◽  
Cutting Velocity

Micro-textured cutting tools were widely reported due to the improved cutting performance, for example, the reduction of cutting forces. However, the cutting performance is significantly dependent on the parameters of the micro-textures. In this work, some polycrystalline cubic boron nitride tools with designed circular micro-textures were designed and manufactured by laser processing technology, and used to machine powder metallurgy materials. The effect of micro-texture parameters (diameter, depth and density) on the cutting forces ( FX, FY, FZ and Fr) was studied by an orthogonal test, the effect of cutting velocity on the cutting force was also studied. The results have shown that the pit diameter and depth have more significant effect on the cutting forces than the cutting velocity and pit density. As compared with the non-textured tools, the textured tools can effectively reduce the cutting forces and the optimal cutting forces were achieved at parameters as 230 μm for diameter, 90 μm for depth, 20% for density and 110 m/min for cutting velocity. The present findings are of significance for the design of polycrystalline cubic boron nitride cutting tools and the processing of powder metallurgy materials.

Fabrication and Cutting Performance of CVD Diamond Coated Inserts with Different Coating Thickness in Dry Turning Aluminum Alloy

2012 ◽  
Vol 497 ◽  
pp. 73-77 ◽  
Author(s):  
Jian Guo Zhang ◽  
Liang Wang ◽  
Bin Shen ◽  
Fang Hong Sun
Keyword(s):  
Aluminum Alloy ◽  
Coating Thickness ◽  
Adhesive Wear ◽  
Cutting Tools ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Cutting Performance ◽  
Dry Turning ◽  
Coated Tools ◽  
Hot Filament

CVD diamond coated inserts with different coating thickness are fabricated using hot filament chemical vapor deposition (HFCVD) method. Scanning electron microscope (SEM) and Raman spectroscopy are introduced to characterize the diamond films. The cutting performance of as-fabricated CVD diamond coated inserts is evaluated in dry turning aluminum alloy. The uncoated WC-Co tool is also adopted in the cutting tests for the sake of comparability. The testing results show that diamond coated tools exhibit much better cutting performance. Coating thickness affects the characteristics of diamond coated cutting tools, the thicker of coating, the more adhesive chips, but the better delamination resistant. The uncoated WC-Co tool suffers adhesive wear for the built-up edge (BUE) breaking.

scholarly journals The Geometric Surface Structure of EN X153CrMoV12 Tool Steel after Finish Turning Using PCBN Cutting Tools

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 428
Author(s):  
Michał Ociepa ◽  
Mariusz Jenek ◽  
Piotr Kuryło
Keyword(s):  
Boron Nitride ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Material Surface ◽  
Roughness Parameters ◽  
Finish Turning ◽  
Polycrystalline Cubic Boron Nitride ◽  
Coated Tools ◽  
Flank Surface ◽  
Geometric Surface

The article presents the results of studying the effects of coated (TiN, TiAlN) and uncoated polycrystalline cubic boron nitride (PCBN) machining blades on the key geometric structure parameters of the surface of hardened and tempered EN X153CrMoV12 steel after finish turning. A comparative analysis of the use of coated and coated cutting tools in finish turning of hardened steels was made. Tool materials based on polycrystalline cubic boron nitride PCBN (High-CBN; Low-CBN) have been described and characterized. The advantages of using TiN and TiAlN-coated cutting tools compared to uncoated were demonstrated. The lowest influence of the feed on the values of all tested roughness parameters was noted for surfaces treated with TiN- and TiAlN-coated tools (both with 50 vol.% of CBN). For uncoated tools (60 vol.% of CBN) for feeds f = 0.2 and 0.3 mm/rev., the highest values of Ra and Rz roughness parameters were found. Moreover, the lack of protective coating contributed to the occurrence of intense adhesive wear on the flank surface, which was also in the range of the feed values f = 0.2 and 0.3 mm/rev. The analysis of material surface after treatment with the uncoated tools with the feed f = 0.2 mm/rev. showed the occurrence of the phenomenon of lateral material flow and numerous chip deflections.

Structural relationships in the synthesis of cubic boron nitride thin films by ion-assisted deposition

1994 ◽  
Vol 52 ◽  
pp. 638-639
Author(s):  
D. L. Medlin ◽  
T. A. Friedmann ◽  
P. B. Mirkarimi ◽  
M. J. Mills ◽  
K. F. McCarty
Keyword(s):  
Boron Nitride ◽  
Ion Irradiation ◽  
Cubic Boron Nitride ◽  
Film Stress ◽  
Bonded Phases ◽  
Structural Relationships ◽  
Precursor Material ◽  
Pressure Synthesis ◽  
Microstructure Of The Material

The allotropes of boron nitride include two sp2-bonded phases with hexagonal and rhombohedral structures (hBN and rBN) and two sp3-bonded phases with cubic (zincblende) and hexagonal (wurtzitic) structures (cBN and wBN) (Fig. 1). Although cBN is synthesized in bulk form by conversion of hBN at high temperatures and pressures, low-pressure synthesis of cBN as a thin film is more difficult and succeeds only when the growing film is simultaneously irradiated with a high flux of ions. Only sp2-bonded material, which generally has a disordered, turbostratic microstructure (tBN), will form in the absence of ion-irradiation. The mechanistic role of the irradiation is not well understood, but recent work suggests that ion-induced compressive film stress may induce the transformation to cBN.Typically, BN films are deposited at temperatures less than 1000°C, a regime for which the structure of the sp2-bonded precursor material dictates the phase and microstructure of the material that forms from conventional (bulk) high pressure treatment.

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