Journal of the Japan Society for Precision Engineering
Online ISSN : 1882-675X
Print ISSN : 0912-0289
ISSN-L : 0912-0289
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Volume 78, Issue 1
Displaying 1-28 of 28 articles from this issue
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Special Issue: Various Technologies from Japan with Experiences of the Disaster
Lecture
My Experience in Precision Engineering
Gravure & Interview
Student Forum
Introduction of Laboratories
Paper
  • Tool Path Generation by Using Configuration Space for Five-Axis Controlled Machining
    —Application to Machining by Using Square and Radius End Mill—
    Takuya MASUDA, Koichi MORISHIGE
    2012 Volume 78 Issue 1 Pages 57-61
    Published: January 05, 2012
    Released on J-STAGE: July 05, 2012
    DOIhttps://doi.org/10.2493/jjspe.78.57
    JOURNAL FREE ACCESS
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    In recent years, 5-axis controlled machine tools attract attention because of the increase in demand for improvements in productivity. Ball end mill is easy to control its location against a cutting surface, and is often used for the 5-axis controlled machining. However, the cutting removal rate of ball end mill is insufficient. Square and radius end mills has the higher removal rate more than ball end mill. On the other hand, the 5-axis controlled machining with square or radius end mill may be difficult compared with the case of ball end mill. In this report, 2-dimensional configuration space that expresses one tool posture by one point on the space was extended to cope with the machining with square and radius end mills. Furthermore, the new tool path generation method was proposed, which can reduce the cutting remains near a character line. As the result of machining simulations, the cutting remains near a character line were reduced, and the utility of the proposed tool path generation method was actually confirmed.
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  • Output Force Distribution Characteristics of Limbs by Coordination of Mono-articular and Bi-articular muscles
    —Measuring Method of Output Force Distribution Characteristics using Joint Torque—
    Toru OSHIMA, Kiyoshi TORIUMI, Tomohiko FUJIKAWA
    2012 Volume 78 Issue 1 Pages 62-66
    Published: January 05, 2012
    Released on J-STAGE: July 05, 2012
    DOIhttps://doi.org/10.2493/jjspe.78.62
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    Until now, output force distribution characteristics in human limbs have been discussed based on joint torque. Furthermore, a measurement method of joint torque was prescribed in detail, and measured value is shown as database to the public. However, in another precedent study, the relationship between output force distribution and muscular strength in human limbs was demonstrated under the theoretical back ground of the coordination of mono-articular muscles and bi-articular muscles, and the relationship between output force distribution and joint torque was made clear more. In this study, under the theoretical back ground of the coordination of mono-articular muscles and bi-articular muscles, new simple measuring method of output force distribution characteristics using joint torque was proposed and its validity was discussed.
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  • Clearance Verification between Stamping Dies by Using Virtual Die Machining Method
    Masatomo INUI, Yuji HASEGAWA, Nobuyuki UMEZU
    2012 Volume 78 Issue 1 Pages 67-71
    Published: January 05, 2012
    Released on J-STAGE: July 05, 2012
    DOIhttps://doi.org/10.2493/jjspe.78.67
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    In the press-working of sheet metal parts for automobile bodies, two stamping die CAD models with mutually inverted curved surfaces are necessary. They are designed to have some clearance between them when they are assembled so that they can properly hold a sheet metal within. Since these two models have very similar curved surfaces, engineers usually design a single CAD model only. The other model is obtained by copying, partly modifying, and inverting the designed model. The modification is generally very small and limited, and the visual inspection of the modified shape is difficult. False modifications often cause bad results in the later trial press-working process and expensive design reworks become necessary. In order to assist the stamping die designer, the authors developed an algorithm for visually inspecting the clearance between the designed model and virtually machined model of its modified counterpart. A fast clearance inspection between 2 models is achieved by using the hierarchical structure of OBBs and the multiple-threading technology.
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  • Effect of Plasma Nitriding Treatment on Surface Integrity of Stainless Cutlery Steel
    —Study on Improvement of Cutting Performance of Cutlery—
    Tsukasa TAMAOKI, Kensuke UEMURA, Akira OKADA, Yoshiyuki UNO
    2012 Volume 78 Issue 1 Pages 72-76
    Published: January 05, 2012
    Released on J-STAGE: July 05, 2012
    DOIhttps://doi.org/10.2493/jjspe.78.72
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    Plasma nitriding treatment is very effective for the hardening of precision metal parts. Especially, high density plasma nitriding can efficiently generate a high density ion with installed hollow cathode, which decreases the damage of the workpiece. As a result, the parts can be cleaned, etched, heated, and nitrided effectively. In this study, an improvement of surface integrity of stainless steel SUS440C is experimentally investigated by nitriding. The experimental analysis made it clear that the surface hardness of workpiece increased due to the generation of nitrided layer even under the low temperature condition like 513K. The nitrided layer was hardened with an increase of process temperature and process time, until a maximum surface hardness of 1700HV.
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  • High Throughput and High Accurate Micro-sieve with Tapered Apertures Fabricated by Tilt Exposing in X-ray Lithography
    Seichin KINUTA, Masashi KOBAYASHI, Sumio HOSAKA
    2012 Volume 78 Issue 1 Pages 77-80
    Published: January 05, 2012
    Released on J-STAGE: July 05, 2012
    DOIhttps://doi.org/10.2493/jjspe.78.77
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    Possibility of high throughput and high accurate sieving has been studied using X-ray lithography and electroforming. Our idea is to design tapered apertures in mesh of the sieve using three dimensional machining of X-ray lithography. The tilt exposing was done in X-ray lithography for the tapered aperture. It is demonstrated to achieve high throughput sieving of 10.5 g/hr using the tapered apertures and high opening rate of 44 % in the proposed mesh, while only electroforming and both UV lithography and electroforming have sieving of 0 and 5.1 g/hr in opening rate of 9 and 25 %, respectively. Furthermore, it is demonstrated that a deviation of the aperture size fabricated by X-ray lithography and electroforming is very small compared with other methods of only electroforming and both UV lithography and electroforming.
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  • Thermo-chemical Polishing of CVD Diamond Thin Film by Wire Brush
    —Effect of Brushing Speed and Heating by Hot Air—
    Kengo FUJIMAKI, Tsuyoshi YOKOSAWA
    2012 Volume 78 Issue 1 Pages 81-85
    Published: January 05, 2012
    Released on J-STAGE: July 05, 2012
    DOIhttps://doi.org/10.2493/jjspe.78.81
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    Mechanical polishing of CVD diamond with diamond abrasives is inefficient. Meanwhile, some metals such as iron and titanium have an affinity for carbon at high temperature, and therefore wheels of such metals are able to thermo-chemically polish CVD diamond. However, stable friction between metal solid wheel and thin film is very difficult and CVD diamond thin film is damaged in the thermo-chemical polishing process. We found that a stainless steel wire brush is able to thermo-chemically polish CVD diamond thin film with no damage. This paper demonstrates fundamental characteristics such as effect of brushing speed and heating by hot air.
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  • Automatic Film Thickness Measurement System for Inkjet-Based Color Filters Based on Three-Wavelength Single-Shot Interferometry
    Katsuichi KITAGAWA, Hiroki SUGIHARA, Tatsuhiko TSUBOI, Kazuyoshi SUZUK ...
    2012 Volume 78 Issue 1 Pages 86-91
    Published: January 05, 2012
    Released on J-STAGE: July 05, 2012
    DOIhttps://doi.org/10.2493/jjspe.78.86
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    An automatic thickness measurement system has been developed for ink-jet based color filter manufacturing process. The RGB cell thickness is calculated from surface profile data measured by three-wavelength single-shot interferometry. Since this method is very robust against vibration, the system does not require an expensive anti-vibration mechanism. For this development, the following techniques have been developed : (a) three wavelength illumination system using multi-bandpass optical filter, (b) automatic alignment algorithm using phase images, (c) automatic focusing method using the profile data, (d) parallel computation by GPU, and (e) phase unwrapping using look-up-table method. The speed is 1.5s per FOV(Field of View) and measurement repeatability is approximately 1nm.
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  • Development of a Miniature Hemispherical Tilt Stage Using Piezoelectric Actuators
    —First Report : Design, Fabrication and Evaluation of Micro Tilt—
    Shinnosuke HIRATA, Masato TAKIZAWA, Hiroaki SHIRATORI, Yuuka IRIE, Chi ...
    2012 Volume 78 Issue 1 Pages 92-97
    Published: January 05, 2012
    Released on J-STAGE: July 05, 2012
    DOIhttps://doi.org/10.2493/jjspe.78.92
    JOURNAL FREE ACCESS
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    Observation and manipulation technology under scanning electron microscopes (SEM) is required in medicine, biology and mechatronics. A miniature hemispherical tilt stage has been proposed for improvement of microscopic observation and manipulation. The stage can be rotated in arbitrary direction under the SEM. The stage is composed of a hemisphere and three drive units. Furthermore, the drive unit is composed of a drive ball and two piezoelectric actuators. The drive ball is moved by two piezoelectric actuators, which are orthogonally arranged, in a plane. The ball moving plane of each hold ball is same as the tangent plane between the hemisphere and each hold ball. The hemisphere on three hold balls is tilted and rotated in arbitrary direction by stick-slip motion of each hold ball. The tilted or rotated direction of the stage can be controlled by the movable directions of each hold ball. In this paper, design and fabrication of the miniature hemispherical tilt stage is described. Then, the tilted directions and linearity of the stage are evaluated by a laser autocollimator in the micro-tilt experiments.
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