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IWABUCHI, AKIRA 경북대학교 트라이볼로지연구소 2001 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.2001 No.-
In this paper, I would like to introduce the summary of the national research project on Next Generation Manufacturing and Production Process of Dies, sponsored by NEDO, Japanese Government from October, 1998 to March, 2000. We thought that the die production technology is the key to maintain the high level of Japanese industries. The project consisted of five research groups of die design technology, super-precision machining, corrosion protection in EDM, mold releasing agent, and production processes, and totally 19 sub-themes were carried out. We tried to confirm the performance of new polishing methods, and made new truing tool of profile-grinding. In relation to tribology, we tried to understand the wear mechanism of cemented carbide during operation against soft metals.
EFFECTS OF CO CONTENT AND WC GRAIN SIZE ON WEAR OF WC CEMENTED CARBIDE
Hiroyuki Saitoh,Akira Iwabuchi,Tomoharu Shimizu 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
WC cemented carbide are used as many die material to improve abration resistance. Mechanical properties of the cemented carbide were influenced by Co content and WC grain size. In this study, effects of Co content and WC grain size of WC cemented carbide on wear were examied. We prepared 13 cemented carbides with different Co content and WC grain size. Wear test was carried out against S45C under dry condition at 98N and 232㎜/s. From the results, we found that wear increased with both Co content and WC grain size. Specific wear rate was range 10??㎣/Nm.
DEPENDENCE OF FRETTING WEAR ON AMBIENT PRESSURE
Asanome Shizu,Iwabuchi, Akira,Shimizu, Tomoharu ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 1998 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.1998 No.-
In this paper the dependence of ambient pressure on the friction and wear of SUS304 stainless steel during fretting at room temperature was investigated. The ambient pressure was varied from 10 to 10 Pa. The experiment was carried out under the following conditions; normal loads of 0.6, 1.0 and 1.8 N, slip amplitudes of 10, 50, and 100 μm, a frequency of 10 Hz and the number of fretting cycles of 105. The friction and wear behaviors were affected by the pressure. In order to examine the formation and separation/removal of the compacted oxide layer in detail, the experiment was carried out in which ambient pressure was changed alternately from 10 Pa to 10 Pa during frettiong. From the change in coefficient of friction, it was found that the removal and formation rates of the oxide were more affected by normal load than slip amplotude, and more changeble at light load than those at higher load.
Simulation of Stick-slip Motion of Serial Printer Caused Surface Roughness
SHIMIZU, Tomoharu,IWABUCHI, Akira,UCHIDATE, Michimasa,KATANO, Keiji ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 2000 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.2000 No.-
A serial printer sometimes generates a vertical striped pattern in the printing image. This is known as jitter and can be considered to be caused by vibration of the print-head carriage system. The vibration of carriage is due to a lot of factors, step driving of the stepping motor, meshing between the belt and the pulley, meshing of the reduction gears, and friction between the linear sliding bearing and the sliding shaft. In this paper, the motion of the carriage is examined concerned with the influence of the carriage is examined concerned with the influence of the friction. Frictional models based on roughness theory, adhesion theory and combined both are considered. 3-D surface data generated numerically are used for calculation of friction. Simulations of carriage motion are carried out with a numerical integration method. In this simulation, N.G.(no good) shaft and normal shaft are examined for the carriage motion. It is shown that the influence of the surface waviness of sliding shaft is larger than the surface roughness.
Monitoring of tool wear for high precision blanking using AE technique
SHIMIZU, Tomoharu,NISHI, Junichiro,IWABUCHI, Akira ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 1999 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.1999 No.-
It is important to estimate progress of the tool wear of press working, because the tool wear cause low precision products. So, the aim of this research is establishment in a monitoring technique of press tool wear. Acoustic emission (AE) were measured during high precision blanking. An auto-regressive (AR) model analysis were conducted for the AE signals. Then, AR parameters obtained were analyzed with principal component analysis, which is one of multivarate analysis method. The correlations between the change in AR parameters and the degree of the progress of the tool wear were examined. The possibility of monitoring of the tool wear for the press working was indicated.
FRETTING WEAR PROPERTY OF ZR-ALLOY IN Na₂SO₄ SOLUTION
SHIMIZU, Tomoharu,NAKAMURA, Tomohiro,IWABUCHI, Akira,SUGAWARA, Yusaaku,KIM, Seck Sam ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 2000 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.2000 No.-
Fuel rods in nuclear power plants, made of Zr-alloy(zircaloy-4), is immersed in pure water, and surging of this coolant causes fretting for the rods and spacer. In this paper fretting wear of Zr-alloy is investigated in corrosive environment. As the corrosion behavior in fretting is important, Na₂SO₄ solution was used, and electrochemical approach was taken. The wear increases with the potential, which means the electrochemical factor is significant in the fretting of Zr-alloy in corrosive environment. The dynamic corrosion kinetics in the fretting was discussed.
Chen, Rong,Shimizu Tomoharu,Iwabuchi Akira,Shin, Hyung Seop ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 1998 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.1998 No.-
The sliding wear behavior of NiAl and SiC particles reinforced aluminum alloy matrix composites against S45C steel was studied. The special attention was focus on the effect of applied load on the wear resistance of particle reinforced composites. The wear rates of NiAlp/Al and SiCp/Al composites at loads below 3.5N or above 13.5N were much lower than those of aluminum alloy, however, the wear rates of composites are increased to a levels comparable to that of unreinforced aluminum alloy in the middle applied loads. The SiCp/Al composites abraded the counterface materials S45C steel at higher wear rates than aluminum alloy at the entire applied load range. However, the NiAlp/Al composites abraded the steel at the maximum wear rete at lower loads near 5 N even if the hardness of NiAl particle is smaller than that of SiC. As load increased, the wear rates of steel against NiAlp/Al became smaller and were almost the same as those worn against aluminum.
MONITORING OF ROLLING WERA USING THE POTENTIAL DROP METHOD
Shimizu, Tomoharu,Ueno, Hiroharu,Iwabuchi Akira ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 1998 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.1998 No.-
A surface damage evaluation system was developed. The alternating current porential drop(ACPD) method was used in this system. This system consists of a personal computer, a frequency generator, a power current amplifier, two DC amplifiers and two high speed A/D converters and has a compensating technique for inductive pick-up of AC voltage. The inductive pick-up is a most important cause of measurement error at ACPD method. Middle carbon steel and bearing steel were used for rolling wear specimens, and reciprocating rolling wear tests were carried out. Signals of ACPD from durface which damaged with rolling wear and applied alternating current were measured. These signals were analyzed by computer program and the phase difference between these signals was detected. Then the inductive pick-up was compensated. We could estimate the true value of ACPD voltage successfully and show surface damage(rolling wear) with the increase of AC potential drop.
Frictional Behavior ofr-Irradiated MoS₂Coating Film at Cryogenic Temperatures
Yoshino, Yasuhiro,Ishikawa, Kaneto,Shimizu, Tomoharu,Iwabuchi, Akira,Makoto, Sugimoto ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 1999 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.1999 No.-
Frictional problems in superconducting magnets are related to the stability and reliability of the magnets, because frictional heating causes quench of the manger and the frictional resistance determines the limit of the shear force at the contacting sufaces. In addition to these problems, magnet structural materials are exposed with neutron and γ-ray in Deutrium- Tritum type fusion reactor, so that it is required to investigate the frictional behavior for irradiated magnet structural materials at cryogenic temperatures. In this study, we investigated the influence of γ-irradiated MoS2 coating film and GFRP AT 4.2 K 77K AND 293 K under fretting conditions.