Journal of the Japan Society for Precision Engineering
Online ISSN : 1882-675X
Print ISSN : 0912-0289
ISSN-L : 0912-0289
Search
Advanced search
OR
Browse
Search
Volume 81, Issue 8
Displaying 1-26 of 26 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
Special Issue: Femtosecond Laser Microprocessing Opens Up Development Potential for Highly Functional Devices
Review
Lecture
My Experience in Precision Engineering
Gravure & Interview
Introduction to Precision Engineering
Introduction of Laboratories
 
Paper
  • Study of Shrink Fitting for Shaft Couplings by Laser Heating
    Tadashi KISHIMOTO
    2015 Volume 81 Issue 8 Pages 758-762
    Published: August 05, 2015
    Released on J-STAGE: August 05, 2015
    DOIhttps://doi.org/10.2493/jjspe.81.758
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Laser shrink fitting for shaft coupling was developed as application of laser forming. The coupling of the bar and pipe of stainless steel is made by laser shrink fitting. A bar is inserted into a pipe, and the pipe surface of the bar-inserted-part is irradiated and heated by 1kW class laser. Metallographic structure of the laser irradiated part of the pipe is not changed. The fitted part of the pipe is shrunk in both circumferential and axial direction. The residual stress on the surface of the fitted pipe is a tensile one in the circumferential direction. No residual stress exists in axial direction. The tensile strength of the fitted part is nearly equal to the tensile strength of base metal of stainless steel pipe.
    View full abstract
    Download PDF (1976K)
  • Polishing of Potassium Dihydrogen Phosphate Single Crystal in Saturated Solution by Laser Beam Scanning
    —Polishing Conditions and Surface Roughness—
    Takeshi NAKAMOTO, Chinatsu TAKAHASHI, Tatsunori FURUKAWA
    2015 Volume 81 Issue 8 Pages 763-767
    Published: August 05, 2015
    Released on J-STAGE: August 05, 2015
    DOIhttps://doi.org/10.2493/jjspe.81.763
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Potassium dihydrogen phosphate (KDP) is a non-linear optical and water-soluble crystal. However, the KDP is brittle material. Therefore, it takes a large cost to obtain the surface roughness required in generating harmonics. A new polishing method using YAG laser beam is developed and verified the method by experiments in this paper. A YAG laser beam is focused at the edge of the end face of a single crystal in a saturated solution. The laser beam is scanned along the edge of the end surface. It is possible to polish the scanned surface and the other portions are not removed in a saturated solution. In this paper, the influences on the surface roughness of a KDP crystal are examined from the conditions related to the dose of the laser beam power, scanning speed and repetition of scanning. The surface roughness of a KDP single crystal could be improved by this method in the wide conditions of the beam scanning.
    View full abstract
    Download PDF (1742K)
  • Ultra-Precision Grinding and Topographical Surface Characterization of PMN-PT Ferroelectric Single Crystals
    Hideaki TAKAHASHI, Yoshiharu NAMBA
    2015 Volume 81 Issue 8 Pages 768-773
    Published: August 05, 2015
    Released on J-STAGE: August 05, 2015
    DOIhttps://doi.org/10.2493/jjspe.81.768
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Thin plates of lead magnesium niobate-lead titanate (PMN-PT) single crystal were ground with various cup-type resinoid-bonded diamond wheels on an ultra-precision surface grinder to obtain super smooth surfaces. The ground surfaces and sub-surfaces were observed with various instruments, such as laser microscope and atomic force microscope. The grinding modes such as ductile, ductile & fracture, and fracture modes are affected by grinding conditions. The relationship between finished surface roughness and grinding conditions was clarified experimentally. Very smooth surface less than 1nm Ra without micro-crack was obtained by ultra-precision one pass grinding. Compared with polishing, very sharp edges were also obtained by ultra-precision grinding.
    View full abstract
    Download PDF (2380K)
  • Numerical Study on Behaviors of Reflected Light in Laser Processing with Axisymmetrically Polarized Beams
    Hiroshi KIKUCH, Akio MIZUTANI, Hisao KIKUTA
    2015 Volume 81 Issue 8 Pages 774-780
    Published: August 05, 2015
    Released on J-STAGE: August 05, 2015
    DOIhttps://doi.org/10.2493/jjspe.81.774
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Laser processing using axisymmetrically polarized beams, such as radially and azimuthally polarized beams, was simulated to investigate influence of beam polarization from a point of view of behavior of light. A numerical simulator based on a ray-tracing method was developed to calculate drilling holes and digging grooves including influence of multiple beam reflection of polarized light. Simulation results showed that, even in digging grooves, the absorbed energy of reflected light was greater than that of incident light at the first reflection, especially in the case of the circularly polarized beam. Reflected rays of light of the radially and circularly polarized beams contributed to making grooves deep. Reflected rays of the azimuthally polarized beam contributed to broadening the groove.
    View full abstract
    Download PDF (2889K)
  • A Group Decision Making Process Using Delphi-Type Interaction and Its Experimental Evaluation
    Hajime MIZUYAMA, Toshiyuki KOMATSU
    2015 Volume 81 Issue 8 Pages 781-787
    Published: August 05, 2015
    Released on J-STAGE: August 05, 2015
    DOIhttps://doi.org/10.2493/jjspe.81.781
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A group decision making process is often adopted for creating, comparing and prioritizing multiple alternative solutions to a problem. This paper proposes a semi-structured discussion approach involving Delphi type interaction for properly managing such a group decision making process. The approach divides a whole discussion process into several rounds, and, at the beginning of each round, the members' overall evaluation scores on the solutions at the time are aggregated and their distribution is visually feedback to each member. This makes it apparent how differently minorities evaluate the solutions. As a result, the focus of discussion is spontaneously drawn to, for example, background information of the difference. This can prevent the group from falling into groupthink and lead to a higher quality decision integrating the intellectual contributions of not only majorities but also minorities. Further, laboratory experiments are conducted to confirm whether the proposed discussion approach works as expected.
    View full abstract
    Download PDF (2465K)
  • Efficient Collision Detection for Large-Scale Point-Clouds
    Takeru NIWA, Hiroshi MASUDA
    2015 Volume 81 Issue 8 Pages 788-792
    Published: August 05, 2015
    Released on J-STAGE: August 05, 2015
    DOIhttps://doi.org/10.2493/jjspe.81.788
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Terrestrial laser scanners can capture dense point-clouds from engineering plants. Dense point-clouds are useful for collision detection of objects that move in engineering plants. We propose a real-time collision detection method for large-scale point-clouds. In our method, statuses are classified into collision, no collision, and unknown. The unknown status indicates that points are missing at the object position because of occlusion. Collisions are evaluated on depth-maps, which are generated from point-clouds. Two-resolution of depth-maps are used for improving performance. High-resolution depth maps are used only when objects collide on rough resolution depth maps. Our experimental results show that our method could quickly detect collisions between a large-scale point-cloud and mesh models.
    View full abstract
    Download PDF (3743K)
  • Study on Digital Style Design
    —Fabric Design Support System—
    Ayumi HARA, Hideki AOYAMA
    2015 Volume 81 Issue 8 Pages 793-800
    Published: August 05, 2015
    Released on J-STAGE: August 05, 2015
    DOIhttps://doi.org/10.2493/jjspe.81.793
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    During design process in clothing production, states of wrinkles and folds formed on dress according to human posture and movements are an important design element. However envisaging the wrinkles and folds is not easy because fabric states strongly depend on mechanical properties of a fabric. In this paper, a fabric model taking into account slipping of the warp and the weft at the contact point of them is proposed and a fabric simulation system using this model is developed. In addition, the effectiveness of the simulation system based on the proposed model is confirmed by using a θ-φ function defined from the fabric state obtained in the fabric simulation.
    View full abstract
    Download PDF (2656K)
  • Advanced Visual Inspection Technology with 2-Dimensional Motion Images
    —Line Composition and Integration(LCI) Method Improve Defect Detection Performance—
    Osamu HIROSE
    2015 Volume 81 Issue 8 Pages 801-806
    Published: August 05, 2015
    Released on J-STAGE: August 05, 2015
    DOIhttps://doi.org/10.2493/jjspe.81.801
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    This paper presents an advanced technology for visual defect inspection. Line sensor is usually used to inspect defects on web-shape products such as long films. However, one-dimensional image data captured via line sensors always includes restrictive optical information about defects. Therefore, inspection performance is limited. With the advantage of using area sensors, two-dimensional images containing more optical information can be obtained. A novel imaging procedure named LCI(Line Composition and Integration) method is shown. The LCI extracts defect images from two-dimensional motion images in real-time. The experimental results show that the new image processing framework enhances the appearance of defects. An in-line web inspection system for film manufacturing lines is also presented.
    View full abstract
    Download PDF (2587K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top