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Geometric design of a face gear drive with a helical pinion
Kazumasa Kawasaki,Isamu Tsuji,Hiroshi Gunbara 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.4
The application of face gear drives, which have been used recently instead of bevel and hypoid gears for helicopter transmission, has resulted in renewed interest in such drives. A helical pinion must be utilized to change the composition of the contact surface freely. In this work, the problem of where to place the pinion with respect to a gear is solved by defining a reference point. The effect of the helix angle on the composition of the surface contact lines is clarified. A geometric design method that recognizes meshing singularity is proposed. Two unique lines on which specific sliding becomes infinite are regarded as design indexes. Results show that the contribution of the surface contact lines changes significantly depending on the helix angle, and the offset distances influence the effective tooth width of the gear.
( Kazumasa Usukura ) 대한상하수도학회 2007 공동추계 학술발표회 논문집 Vol.2007 No.-
(1) Less than 10ppm can be reduced to half with a weight, the consumption of the deodorant by the hydrogen sulfide density of the dehydration cabin when they inject poly ferrous sulfate 1,000mg/L to sludge. (2) I can reduce the water content of the dehydration cake 0.5% by injecting poly ferrous sulfate 1,000mg/L. (3) It can be reduced to half by phosphorus density in dehydration separation water by injecting poly ferrous sulfate 1,000mg/L. By the result mentioned above, I examine running cost. I cannot mention it for circumstances of the space in detail, but about 12,000 dollars a year can save the result of the test calculation by a deodorant and reduction of gas for dehydration cake destruction by fire. In addition, it is easy to come to make sewage treatment by removing phosphorus in the separation liquid. (Inquiries) Technical Development Section, Technical Department, Tokyo Metropolitan Sewerage Service Corporation Institution Administration Institution Management Section MIYAGI
High-speed milling of Inconel 625 alloy using carbide ball end mills
Kazumasa Kawasaki 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12
Inconel 625 alloy has advantageous properties, such as heat resistance and corrosion resistance, which make it a suitable material in aerospace, energy, and marine industries. However, it is also difficult-to-machine because of factors such as work hardening, low thermal conductivity, and high tool affinity. Therefore, the problems of tool wear, chipping, and adhesion often occur in milling of Inconel 625 alloy using end mills. We conducted experiments on the cutting of Inconel 625 alloy by high-speed milling using carbide ball end mills to investigate the tool wear, chipping, and adhesion under three spindle revolution speeds and two feed rates, and determine the optimal cutting conditions. The effects of spindle revolution speed on the tool and workpiece were clarified, and the optimal speed was established to achieve long tool life.
A miniaturization study on the cylindrical cavity having notches around the reentrant structures
Kazumasa Kawasaki 중소기업융합학회 2015 중소기업융합학회 국제학술대회논문집 Vol.2 No.1
In this study, we investigate resonant characteristics on a cylindrical reentrant cavity with axial ridges. A cylindrical circumferential slot is presented. The size of the cavity can be reduced to around 50% by adding circumferential notches on the ridges. A lowfrequency RLC equivalent circuit model is used for estimating the resonance frequency. The simulation results using CST MWS show good agreement with past theoretical predictions and provide useful insight into fundamental concerns associated with electrically small antennas.
Kazumasa Tsubota,Kohtaroh Shutoh,Syou Kato,최혁재,Takashi shiga 국립중앙과학관 2019 Journal of Asia-Pacific Biodiversity Vol.12 No.1
The aquatic plant Sagittaria aginashi, which is an endangered emergent species distributed in SouthKorea, Japan, and the Russian Far East, has an unclear phylogeny and genetic structure. Phylogenetic treesof Sagittaria were constructed based on one nuclear ribosomal DNA (nrDNA) region and on threechloroplast DNA (cpDNA) regions. S. aginashi was included in a clade comprising three endemic ChineseSagitarria species characterized by the presence of small tubercles at the base of the axils. Furthermore,phylogenetic trees based on cpDNA sequences indicated that S. aginashi was more closely related toS. tengtsungensis than to two other species. S. aginashi exhibited little genetic variation, suggesting thatthis species had rapidly spread in these areas. With regard to factors associated with the rapid spread, weconsidered that multiple dispersal methods were involved, namely hydrochory via tubercles, endozoochorous long-distance dispersal, and anthropogenic impacts of rice farming on S. aginashi dispersal.