New Pcbn for Heavy Interrupted Cutting of Hardened Steel

2007 ◽  
Vol 534-536 ◽  
pp. 1117-1120 ◽  
Author(s):  
Katsumi Okamura ◽  
Saturo Kukino ◽  
Tomohiro Fukaya
Keyword(s):  
High Precision ◽  
Tool Life ◽  
Hardened Steel ◽  
Main Process ◽  
Homogeneous Microstructure ◽  
Total Cost ◽  
Interrupted Cutting ◽  
Conventional Grinding ◽  
High Flexibility ◽  
Pcbn Tools

PCBN tools are used worldwide for machining of hardened steel parts in automotive industries. Because cutting by PCBN tools has many advantages, which are high-precision, highefficiency, high-flexibility and low total machining cost, compared with conventional grinding methods. But in heavy interrupted cutting of hardened steel, the tool life is not so stable by sudden breakage of the cutting edge, and total cost of cutting by PCBN is not so economical compared to the grinding. So the conventional grinding is still main process in such applications. Recently, demand for decreasing machining cost has grown in heavy interrupted cutting and much tougher PCBN material is required. To solve this problem, new PCBN has been developed. New PCBN has very fine and homogeneous microstructure to increase the toughness of sintered body that it provides a reliable tool life for heavy interrupted cutting. The features and cutting performances of new PCBN are described in this report.

High Precision Cutting and High Speed Interrupted Cutting of Hardened Steel With PCBN Tools

1999 ◽  
Author(s):  
Katsuhito Yoshida ◽  
Satoru Kukino ◽  
Takashi Harada ◽  
Tomohiro Fukaya ◽  
Junichi Shiraishi ◽  
...  
Keyword(s):  
High Precision ◽  
High Speed ◽  
New Technologies ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Hardened Steel ◽  
Precision Machining ◽  
Polycrystalline Cubic Boron Nitride ◽  
Interrupted Cutting ◽  
Pcbn Tools

Abstract PCBN (Polycrystalline Cubic Boron Nitride) cutting tools have become very familiar in the industries for cutting hardened steel parts and the demand for PCBN tools is growing rapidly. One of the reasons for this is the trend of replacing grinding processes with cutting. Although the trend of processing is to use more cutting, there still remains grinding in many processing fields. High precision machining and high speed interrupted machining have been such fields. In this study it has been verified that a novel cutting method can be applied to high precision machining with the smoothness of Rz 0.8 μm and that a new PCBN has sufficient reliability against tool failure in high speed (< 250m/min) interrupted cutting. Thus cutting has become applicable to those machining and the trend of replacement of grinding with cutting will be enhanced. Those new technologies will be introduced in this report.

Evaluation of tool life and workpiece surface roughness in turning of AISI D6 hardened steel using PCBN tools and minimum quantity of lubricant (MQL) applied at different directions

2019 ◽  
Vol 103 (1-4) ◽  
pp. 971-984 ◽  
Author(s):  
Miguel Mandú Bonfá ◽  
Éder Silva Costa ◽  
Wisley Falco Sales ◽  
Fred Lacerda Amorim ◽  
Luis Henrique Andrade Maia ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Tool Life ◽  
Hardened Steel ◽  
Workpiece Surface ◽  
Minimum Quantity ◽  
Pcbn Tools

scholarly journals Siberian Snakes, Figure-8 and Spin Transparency Techniques for High Precision Experiments with Polarized Hadron Beams in Colliders

Symmetry ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 398
Author(s):  
Yaroslav S. Derbenev ◽  
Yury N. Filatov ◽  
Anatoliy M. Kondratenko ◽  
Mikhail A. Kondratenko ◽  
Vasiliy S. Morozov
Keyword(s):  
High Precision ◽  
High Energy Physics ◽  
High Efficiency ◽  
High Energy ◽  
Polarized Beams ◽  
Polarization Control ◽  
Spin Polarized ◽  
High Flexibility ◽  
Spin Flips ◽  
Energy Physics

We present a review of the possibilities to conduct experiments of high efficiency in the nuclear and high energy physics with spin-polarized beams in a collider complex, configuration of which includes Siberian snakes or figure-8 collider ring. Special attention is given to the recently elicited advantageous possibility to conduct high precision experiments in a regime of the spin transparency (ST) when the design global spin tune is close to zero. In this regime, the polarization control is realized by use of spin navigators (SN), which are compact special insertions of magnets dedicated to a high flexibility spin manipulation including frequent spin flips.

New Pcbn for Heavy Interrupted Cutting of Hardened Steel

2007 ◽  
pp. 1117-1120
Author(s):  
Katsumi Okamura ◽  
Saturo Kukino ◽  
Tomohiro Fukaya
Keyword(s):  
Hardened Steel ◽  
Interrupted Cutting

Tool Wear of Polycrystalline Cubic Boron Nitride Compact Tools in Cutting Hardened Steel

2012 ◽  
Vol 488-489 ◽  
pp. 724-728 ◽  
Author(s):  
Tadahiro Wada
Keyword(s):  
Particle Size ◽  
Boron Nitride ◽  
Tool Wear ◽  
Tool Life ◽  
Cubic Boron Nitride ◽  
Cutting Speed ◽  
Hardened Steel ◽  
Polycrystalline Cubic Boron Nitride ◽  
Cbn Tool ◽  
High Cutting Speed

Using polycrystalline cubic boron nitride compact (cBN) tools, which have different cBN contents and cBN particle sizes, the influences of both the cBN content and the cBN particle size on tool wear in turning of hardened steel at various cutting speeds was experimentally investigated. Three types of cBN tools (a cBN content of 45-55% and 75%, and a cBN particle size of 0.5 μm and 5 μm, respectively) were tested. Furthermore, three kinds of chamfered and honed cutting edges were also used. The main results obtained are as follows: (1) In the case of the cBN tools with the same cBN particle size of 5.0 μm, the tool life of the cBN tool with a cBN content of 75% was longer than that of the cBN tool with a cBN content of 45% at low cutting speed. However, at high cutting speed, the tool life of the cBN tool with a cBN content of 75% was shorter. (2) The tool life of the cBN tool with both a cBN content of 55% and a cBN particle size of 0.5 μm was the longest. (3) The tool wear of cBN tools decreased with a decrease in chamfer width.

Tool Life Distributions—Part 3: Mechanism of Single Injury Tool Failure and Tool Life Distribution in Interrupted Cutting

1978 ◽  
Vol 100 (2) ◽  
pp. 193-200 ◽  
Author(s):  
S. Ramalingam ◽  
Y. I. Peng ◽  
J. D. Watson
Keyword(s):  
Tool Life ◽  
Hazard Function ◽  
Rational Design ◽  
Tool Material ◽  
Distribution Functions ◽  
Life Distribution ◽  
Tool Failure ◽  
Interrupted Cutting ◽  
Life Distributions ◽  
Machining Lines

Tool life distribution under production machining conditions must be suitably accounted for in any rational design of large volume or automated machining lines. Reliable data on the type of distributions likely to be encountered are, however, unavailable. To remedy this, using relevent physical arguments, probabilistic models of tool failure which produce distribution functions germane to tool life scatter have been proposed and developed in earlier parts of this paper. An arbitrarily introduced hazard function was used to predict the life distributions likely to be obtained. The details of the mechanisms giving rise to tool failure were, however, not examined. Mechanistic questions connected with the single-injury tool failure (tool fracture) are examined in this part. The arbitrarily introduced hazard function is shown to have a physical basis. It is shown that the hazard function is determined by the interaction between the characteristics of the environment in which the tool operates and the mechanical properties of the tool material. The concepts outlined and the mechanistic model of tool failure proposed have been tested experimentally in interrupted cutting. It is shown that the predicted Weibull-distributed tool life is obtained when tool failure is due to a single injury and that the parameters of the Weibull distribution are governed by the properties of the tool material as well as those of the machining system.

Machining of Difficult-to-Cut Materials with a Lubricant Coated Tool

2009 ◽  
Vol 407-408 ◽  
pp. 53-56 ◽  
Author(s):  
Masakazu Isaka ◽  
Hiroshi Usuki ◽  
Satoshi Sakamoto ◽  
Kazuyuki Kubota
Keyword(s):  
High Temperature ◽  
Tool Wear ◽  
Tool Life ◽  
Inconel 718 ◽  
Boron Concentration ◽  
Cutting Temperature ◽  
Coating Film ◽  
Interrupted Cutting ◽  
Coated Tool ◽  
High Boron

Tools coated with TiBON films of varying boron concentrations were made, and the influence of boron concentration on tool wear was investigated. The TiBON coating film acts as a lubricant at high temperature. Tools coated with such films were applied to the machining of difficult-to-cut materials (Ti-6Al-4V and Inconel 718), where　the cutting temperature increases rapidly and heavy adhesion occurs. In the experiment, turning and interrupted cutting were performed. In cutting of Ti-6Al-4V, the tool coated with a film of high boron concentration showed long tool life. In turning of Inconel 718, the tool coated with a film of a boron concentration of 15% showed the longest tool life-about four times longer than that of a tool coated with TiAlN.

Machinability Improvement by Workpiece Preheating during End Milling AISI H13 Hardened Steel

2011 ◽  
Vol 264-265 ◽  
pp. 894-900 ◽  
Author(s):  
Mokhtar Suhaily ◽  
A.K.M. Nurul Amin ◽  
Anayet Ullah Patwari ◽  
Nurhayati Ab. Razak
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
Tool Life ◽  
Room Temperature ◽  
End Milling ◽  
Hardened Steel ◽  
Cutting Conditions ◽  
Preheating Temperature ◽  
Aisi H13 ◽  
Coated Carbide

Hardened materials like AISI H13 steel are generally regarded as s difficult to cut materials because of their hardness due to intense of carbon content, which however allows them to be used extensively in the hot working tools, dies and moulds. The challenges in machining steels at their hardened state led the way to many research works in amelioration its machinability. In this paper, preheating technique has been used to improve the machinability of H13 hardened steel for different cutting conditions. An experimental study has been performed to assess the effect of workpiece preheating using induction heating system to enhance the machinability of AISI H13. The preheated machining of AISI H13 for two different cutting conditions with TiAlN coated carbide tool is evaluated by examining tool wear, surface roughness and vibration. The advantages of preheated machining are demonstrated by a much extended tool life and stable cut as lower vibration/chatter amplitudes. The effects of preheating temperature were also investigated on the chip morphology during the end milling of AISI H13 tool steel, which resulted in reduction of chip serration frequency. The preheating temperature was maintained below the phase change temperature of AISI H13. The experimental results show that preheated machining led to appreciable increasing tool life compared to room temperature machining. Abrasive wear, attrition wear and diffusion wear are found to be a very prominent mechanism of tool wear. It has been also observed that preheated machining of the material lead to better surface roughness values as compared to room temperature machining.

scholarly journals Experimental Investigation on the Advantages of Dry Machining over Wet Machining during Turning of AISI 1020 Steel

2021 ◽  
Vol 8 ◽  
pp. 12-25
Author(s):  
Boki Dugo Bedada ◽  
Guteta Kabeta Woyesssa ◽  
Moera Gutu Jiru ◽  
Besufekad Negash Fetene ◽  
Tekle Gemechu
Keyword(s):  
Surface Roughness ◽  
Tool Life ◽  
Cutting Tools ◽  
Cutting Temperature ◽  
Dry Machining ◽  
Dry Turning ◽  
Total Cost ◽  
Cemented Carbide Tool ◽  
Lathe Machine ◽  
The Cost

In this study, the experiment was conducted to investigate the advantage of dry machining over wet machining during turning of AISI 1020 steel using cemented carbide tool on a CNC lathe machine. Surface roughness and cutting temperature were measured by VOGEL surface roughness tester and infrared thermometer respectively. The experiments were conducted based on Taguchi L9 orthogonal array design. Surface roughness, cutting temperature, tool life, and machining cost were analyzed graphically. The average surface roughness and cutting temperature achieved with wet machining was 2.01 μm and 26.540C, which was 17.41% and 44.86% respectively, lower than dry machining. The high cutting temperature in dry turning result in short tool life, which was 41.15% shorter than wet turning. The machining cost of wet turning was about 56% greater than the cost of dry turning. The cost of coolant in wet turning is 42.88% greater than that of the cutting tools. The highest cost was shared by tool cost, which was 81.33% of the total cost for dry turning, while 70.00% of the total cost was shared by coolant cost for wet turning. Results revealed that dry turning is more economical than wet turning.

scholarly journals Development of α - β type titanium alloy Ti-4.5Al-2.5Cr-1.2Fe-0.1C-0.3Cu-0.3Ni having good forgeability and machinability

2020 ◽  
Vol 321 ◽  
pp. 11073
Author(s):  
Takashi KONNO ◽  
Keitaro TAMURA ◽  
Yoshio ITSUMI ◽  
Kohei YOKOCHI ◽  
Koichi AKAZAWA ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Tensile Properties ◽  
Tool Life ◽  
Hot Deformation ◽  
Room Temperature ◽  
The Other ◽  
Total Cost ◽  
Alloy Addition ◽  
Alpha Beta ◽  
Deformation Stress

Development of a titanium alloy having excellent hot forgeability and machinability while having the same properties as Ti-64 alloy is effective in reducing the total cost of titanium parts. To develop a new alpha-beta type titanium alloy which has good hot forgeability, machinability and tensile properties equivalent to those of Ti-64 alloy at room temperature, Ti-4.5Al-2.5Cr-1.2Fe-0.1C-nCu-nNi (n=0 to 2) were prepared and evaluated. The new alloy showed tensile properties equivalent to that of Ti-64 alloy at room temperature. On the other hand, the hot deformation stress of new alloy was about 30% lower than that of Ti-64 alloy, and the excellent deformability was confirmed. The addition of Cu and Ni to Ti-4.5Al-2.5Cr-1.2Fe-0.1C alloy suppressed the amount of wear of tool and improved the machinability. Tool life of new alloy machining is extended by about 1.5 times compared to that of Ti-64 alloy. Addition of Cu and Ni is considered to reduce the reactivity between tool and workpiece and improve machinability.

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