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Application to 5-axis machine tools
Nozomu Mishima
Session ID: A06
Published: 2007
Released on J-STAGE: March 28, 2008
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Atsushi Kawamata, Yoshio Saito, Tomohisa Tanaka
Session ID: A07
Published: 2007
Released on J-STAGE: March 28, 2008
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Precise Identification Method of Joint Contact Stiffness
Shinji Shimizu, Seishiro Honda, Haruhisa Sakamoto, Shinsuke Yagyu
Session ID: A08
Published: 2007
Released on J-STAGE: March 28, 2008
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Shinsuke Yagyu, Masatomo Kita, Shinji Shimizu
Session ID: A09
Published: 2007
Released on J-STAGE: March 28, 2008
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Takeshi Funatsu, Tatsuhiko Sakaguti, Keiichi Nakamoto, Keiichi Shirase
Session ID: A13
Published: 2007
Released on J-STAGE: March 28, 2008
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Verification of the machined accuracy using contour cutting path
Toshifumi Muramatsu, Mikio Fujio, Keisuke Igarashi, Hitoshi Suzuki
Session ID: A14
Published: 2007
Released on J-STAGE: March 28, 2008
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The purpose of this research is to develop hi-speed and hi-accuracy machining system which is corresponded to 1 micron of accuracy. The servo data is the set of position command at every servo cycle time, which is minimum unit of position command in NC machining processes. The servo data is directly generated by geometric model interpolation without NC program. And motion errors are simulated and compensated automatically. This report refers to the result accuracy of machining experiment by adapting the geometric model interpolation and compensation of motion error by using contour cutting path.
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Application to the predictive direction of tool deflection
Mikio Fujio, Shouta Kuroyama, Kana Miyashiro, Seiji Shirai
Session ID: A15
Published: 2007
Released on J-STAGE: March 28, 2008
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A NC geometric cutting simulator is widely used software that is able to verify a tool path without real machining process by executing the machined shape check and the interference check between a tool and a work piece during machining. However, current NC machining simulator is only considered for the geometric information of an objective shape and a tool. For this reason, it is difficult to represent the tool deflection and wear caused by a physical phenomenon. In this study, to realize further high-precision machining, a predictive direction algorithm for the tool deflection is developed. This paper describes about calculation algorithm of direction of tool deflection from removal volume and the normal vector of contact points.
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Yuichi Anazawa, Atsushi Matsubara, Soichi Ibaraki, Daisuke Kono
Session ID: A16
Published: 2007
Released on J-STAGE: March 28, 2008
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Kazuya Takahashi, Chengri Cui, Masaomi Tsutsumi
Session ID: A18
Published: 2007
Released on J-STAGE: March 28, 2008
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This paper describes a developed servo-clinometer which automatically measures the angular positioning deviations of a tilting axis. Five-axis machining center consists of three translational axes and two rotary axes. The positioning accuracy of translational axes is checked by a laser interferometer. Although, there is no proper instrument to measure the tilting angle of the table whose tilting center line is lower than the top surface of table. Therefore, a servo-clinometer consisting of rotary encoder, pendulum with precision electronic level and servo motor was developed. The developed servo-clinometer mounted on the tilting table moves around the tilting axis, and the pendulum moves by the servo motor so that output of electronic level becomes 0 V. Through the experiment, it is confirmed that the developed instrument can measure the deviations with enough accuracy.
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Yoshitaka Morimoto, Yoshio Ichida, Ryunosuke Sato, Yukio Oohori
Session ID: A19
Published: 2007
Released on J-STAGE: March 28, 2008
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A new cutting tool holder that enables to extend the stroke of a PZT more than 100mm has been developed. The cutting tool holder consists of two different area's fluid chamber and a PZT. The extension magnitude is almost 100 times than the one of original stroke. On the other hand, this developed holder can reduces the stroke by the change of layout of fluid chamber. In this case, the reduction of stroke is about 1/100 times than that of the original stroke. In this report, the basic performances are evaluated and the some applications are introduced by this developed tool holder.
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Principle of the Compensation and Influence of Driving Condition
Hiraku Torinoumi, Kazuhiro Yokoyama, Mizuki Saito, Toshimichi Moriwaki ...
Session ID: A20
Published: 2007
Released on J-STAGE: March 28, 2008
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Compensation for Zero Positioning Accuracy under Circumference Temperature Change
Hiraku Torinoumi, Kazuhiro Yokoyama, Mizuki Saito, Toshimichi Moriwaki ...
Session ID: A21
Published: 2007
Released on J-STAGE: March 28, 2008
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Avoiding Quick Motion on Axis of Rotary Table
Mariko Fujita, Jun'ichi Kaneko, Kenichiro Horio
Session ID: A36
Published: 2007
Released on J-STAGE: March 28, 2008
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Consideration about the Finding Method of Error Source
Atsuo Tamura, Kazuya Matano, Yukitoshi Ihara
Session ID: A37
Published: 2007
Released on J-STAGE: March 28, 2008
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Evaluation of Servo Motor Load and Vibration Characteristics
Kohta Ohtake, Keiichi Nakamoto, Toshimichi Moriwaki
Session ID: A38
Published: 2007
Released on J-STAGE: March 28, 2008
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High speed ball-end milling is expected to realize efficient and productive machining of sculptured surfaces. Parallel mechanisms, which can realize high accuracy and high rigidity theoretically because of its closed loop structure, have suitable structure for machine tools. However, dynamic and static characteristics vary considerably even though within working space, because imposed forces and length of each strut vary in every spindle's position and posture. In this study, servo motor load and vibration characteristics are evaluated in various cutting motion, in order to support the process planning for parallel kinematic machine tools.
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Masahiro Komori
Session ID: A39
Published: 2007
Released on J-STAGE: March 28, 2008
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Yasufumi Ueda, Tohru Ishida, Yoshimi Takeuchi
Session ID: A43
Published: 2007
Released on J-STAGE: March 28, 2008
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Yan Zhu, Tatsuhiko Sakaguchi, Keiichi Shirase
Session ID: A44
Published: 2007
Released on J-STAGE: March 28, 2008
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Application for various shaped triangles cluster
Masaaki Fukuda, Hiroshi Matsuda, Hiroyuki Sasahara, Masaomi Tsutsumi
Session ID: A45
Published: 2007
Released on J-STAGE: March 28, 2008
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The patch division milling which can generate a geometric pattern with a ball-end mill was applied to a curved surface. The surface is divided into a lot of just about same size small triangle patch segments. The whole inside area of each triangle patches is machined along a helical tool path. In this study, the method for patch division on curved surfaces, generation of tool path and the control of tool rotation angle which align geometric pattern are described. Tool rotation angle is calculated from vertex coordinates from each triangle patches, number of flutes, feed per tooth and cross feed rate. From the results of experiments, it is shown that the patch division milling can generate the aligned geometric pattern inside area of each triangle patches on the curved surface.
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Shotoku Takase, Tohru Ohnishi, Kiyoshi Takamasu
Session ID: A46
Published: 2007
Released on J-STAGE: March 28, 2008
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There are many influencing factors on making measurements of out of roundness. These are stylus length, stylus force, probe calibration, thermal drift, alignment, and so on. The measurements are carried out with the spindle measuring instrument Talyrond 62. The probing system is calibrated with the aid of amplifier standards (Flick). In this paper, influencing factors are checked one by one. And finally, alternative probe calibration will be proposed.
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Toshiaki Segawa, Masami Matsubara
Session ID: A61
Published: 2007
Released on J-STAGE: March 28, 2008
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Takahiro Sato, Kazuki Kikui, Akira Kato
Session ID: A62
Published: 2007
Released on J-STAGE: March 28, 2008
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Osamu Horiuchi, Yoshihiko Murakami, Takayuki Shibata
Session ID: A63
Published: 2007
Released on J-STAGE: March 28, 2008
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Relationship Between Dynamic Runout and Behavior in Drilling
Hidehito Watanabe, Hideo Tsuzaka, Masami Masuda
Session ID: A64
Published: 2007
Released on J-STAGE: March 28, 2008
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Investigation of Drilling Conditions
Akira Mizobuchi, Hitoshi Ogawa, Masahiro Masuda
Session ID: A66
Published: 2007
Released on J-STAGE: March 28, 2008
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This report deals with drilling conditions to obtain smaller crack size when through-hole drilling soda-lime glass substrate of a thickness of 2.8mm using an electroplated diamond tool with a diameter of 1mm equipped chip pockets. The drilling conditions of a feed speed of 1mm/min and a mesh size of #600 bring out the crack size of 0.1mm or less. However, the size increases with drilling numbers due to the adhesion of chips.
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Measurement of Roundness, Cylindricity and Straightness
Akio Katsuki, Hiroshi Murakami, Hiromichi Onikura, Takao Sajima
Session ID: A67
Published: 2007
Released on J-STAGE: March 28, 2008
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Until now, the autocollimation principle has been applied to the system to measure accuracies of a deep hole, and its accuracies have been evaluated. The measuring unit is installed in the front end of a laser-guided probe. The hole accuracies are measured by scanning the hole wall spirally. In this research, the accuracy and repeatability of the measuring unit are examined by measuring the roundness, cylindricity and straightness of holes. As a result, it is clarified that the accuracies measured by the measuring system correspond well to the tester in both shape and value and that the standard deviation of ten measuring values of roundness is 0.19μm.
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Design for various hole sizes
Akio Katsuki, Hiromichi Onikura, Takao Sajima, Hyun Koo Park, Takahiro ...
Session ID: A68
Published: 2007
Released on J-STAGE: March 28, 2008
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The probe, which is guided by a laser, is developed. Its front part, on which a pentaprism and a stylus with a corner cube prism are fixed, rotates and scans hole wall spirally. The movement of the stylus perpendicular to the hole wall is measured by a laser interferometer, which is set in front of the probe. Minimum diameter of a hole, which can be measured by the probe, is 100 mm.
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Haruki Obara, Masayuki Kaminaka, Shigeru Yamada
Session ID: A73
Published: 2007
Released on J-STAGE: March 28, 2008
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Machining of narrow and deep groove for plastic mould is difficult because of the deformation and vibration of the thin end mil. In this report a method where the end mill is backed-up by a thin plate is proposed for stable machining of the groove.
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Shinichi Kogusu, Yasuhiko Ohgiya, Takakazu Ishimatsu
Session ID: A74
Published: 2007
Released on J-STAGE: March 28, 2008
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Structured surfaces on metal are often employed to enhance lubricating features, reduce the hydrodynamic drag force along wings and also decorate the metal surfaces for architectural ornament. It is important to note that even single movements of a ball-end mill parallel to the metal surface generate the indented surface on the metal surface based on the cutting condition. In this paper a technique to determine the cutting condition to generate the desired dimpled surface is proposed. The design specifications of the dimpled surface are the width of the dimples and the spacing between the dimples. The proposed technique was successfully used to decorate metal surfaces.
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Effect of drill shapes on the drill-out of CFRP
Shigehiko Sakamoto, Yusuke Kajiwara, Heiji Yasui, Hideki Moriguchi, Ju ...
Session ID: A75
Published: 2007
Released on J-STAGE: March 28, 2008
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CFRP (Carbon Fiber Reinforced Plastic) has higher specific strength, modulus of elasticity and so on. However, CFRP is well known as difficult-to-cut material which has very strong physical and mechanical characteristics. Drilling technique of CFRP which is one of the most important cutting operations is currently carried out in industrial factories. In this research, it is considered that the effect of drill tools which have different shapes on the machining accuracy of drilling holes on CFRP plates. From our experiments, cemented-carbide ball end mill is suitable for the drilling of CFRP plates. In case of ball end mill in the drilling process of CFRP plates, the thrust forces is below 100 N and drilled holes have good quality without large burrs and chippings until 80 drilling processes.
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Shoichi Tamura, Takashi Matsumura, Tsuneyoshi Suzuki, Yasuhiro Shinoha ...
Session ID: A76
Published: 2007
Released on J-STAGE: March 28, 2008
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Takenori Ohno, Takashi Matsumura
Session ID: A77
Published: 2007
Released on J-STAGE: March 28, 2008
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Hiroyasu Iwabe, Takurou Higuchi, Yuichi Kikuya
Session ID: A79
Published: 2007
Released on J-STAGE: March 28, 2008
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Small size ball end mills are used for machining of mold and dies frequently. But it is not clear the behaviour of the end mill during machining, because the cutting edge shape is very complex and used under the high speed spindle rotation. Then, we made 3d-CAD model and FEM model of the cutter. And the behaviour of the tool during machining is calculated using cutting force obtained by cutting tests. And also, we discussed the influence of the behaviour on cutting conditions.
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Estimation of Cutting Depth on Cutting Edge by Geometric Calculation with Graphics Hardware
Jun'ichi Kaneko, Kenichiro Horio
Session ID: A80
Published: 2007
Released on J-STAGE: March 28, 2008
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This study deals with new geometric calculation method to predict instantaneous cutting force in NC machining process. In previous studies, estimation of undeformed chip form is achieved by geometric calculation with CPU. In this paper, we propose new algorithm based on performance of graphics hardware (GPU). In the proposed algorithm, GPU in rendering process estimates distance from view point to tool swept volumes, initial workpiece shape and locus surface of cutting edge and detects the nearest surface from reference plane on each view line in short time. By referring color on rendered image, we can estimate a part of cutting edge removing workpiece in each cutter location and rotate angle. The developed prototype system can predict the instantaneous cutting force at arbitrary position of cutting tool within dozens of milliseconds.
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Hideyasu Hasegawa, Heisaburo Nakagawa, Keiji Ogawa
Session ID: A81
Published: 2007
Released on J-STAGE: March 28, 2008
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Mitsuru Shimomura, Uryu Toh, Hiroyuki Sasahara
Session ID: A82
Published: 2007
Released on J-STAGE: March 28, 2008
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In metal cutting, mechanical energy is transformed into heat. The heat flows into workpiece, chip and tool. It will cause the thermal expansion and decrease the cutting accuracy. Thus, it is important to quantitatively elucidate the correlation between these thermal behaviors and machining errors. In this paper, a thermal -elastic-plastic model was developed to determined the thermal energy flowing into workpiece, chip and tool. The temperature distributions of the workpiece during sequential cutting process were predicted by FEM analysis. In particular, the effect of the time interval between two cuttings on the temperature distribution of the workpiece was investigated.
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Zuanshi Haranud, Tomohisa Tanaka, Yoshio Saito
Session ID: A83
Published: 2007
Released on J-STAGE: March 28, 2008
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One of the most important techniques in machining process is to produce a part with freeform surfaces that are widely used in modern CAD/CAM systems. To manufacture the freeform surfaces, three-axis computer numerical control (CNC) milling machines with ball-end cutters are frequently utilized. The utilization of CNC machines for freeform surfaces has driven extensive research work, especially in the area of tool path generation. In order to generate the efficient tool path for the CNC machine, the relationship between the machining time and the scallop height is studied in this research. There are several tool path patterns in actual machining process, but it is difficult to select the appropriate path pattern from the point of the productivity and surface integrity. The selection method of path pattern is proposed considering the normal direction of surface and the scallop height. Through the simulation and experimental results, it is confirmed that the method proposed here is available to evaluate the machining time and to optimize the tool path generation.
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Akira Okada, Taisuke Ishida, Atsuo Iio, Yoshiyuki Uno, Kunihiko Fujiwa ...
Session ID: B02
Published: 2007
Released on J-STAGE: March 28, 2008
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In general, at least 100 tools and jigs have to be prepared in one orthopedic surgery, because the tools and the jigs with optimum shapes for each patient are needed for the better operation. Most orthopedic surgical tools and jigs are repeatedly used, and so the removal of burr, scratch and rust on the surface of the tools is carried out after the operation. This finishing process takes a long time which leads to high cost. In this study a new finishing method by large-area electron beam irradiation is proposed. In this method, EB with high energy density can be attained without focusing the beam, and large-area EB can be used for melting or evaporating the metal surface instantly. Some kinds of stainless steel for orthopedic surgical tools were examined using the large-area EB irradiation method. The experimental results made it clear that high efficient surface finishing of stainless steels was possible by the large-area EB irradiation.
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Tsuneo Kurita, Nozomu Mishima
Session ID: B03
Published: 2007
Released on J-STAGE: March 28, 2008
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Creation of Solid of Revolution by Introducing a Rotational Axis
Tohru Ishida, Hiroki Nagasawa, Masahiko Kita, Yoshimi Takeuchi
Session ID: B04
Published: 2007
Released on J-STAGE: March 28, 2008
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The study deals with creation of a cross-sectional-shape changing hole with a solid of revolution by introducing a rotational axis. In general, machined holes have straight axes and their cross-sections are constant circles since holes are machined by drills. In other words, shapes of machined holes do not have so much variety. To solve the problem, the device was developed which can machine a certain shape on an inside wall of a straight hole by means of electrical discharge machining. This results in fabrication of cross-sectional-shape changing holes. However, the device had only ability to make two-dimensional shapes. In the study, therefore, the device has been improved so that three-dimensional shapes can be machined inside holes. From the result of the machining experiment, it is found that the improved device can machine a cross-sectional-shape changing hole with a solid of revolution.
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Observation of electrical conductive layer and debris
Hiromitsu Gotoh, Takayuki Tani, Naotake Mohri, Yasushi Fukuzawa
Session ID: B06
Published: 2007
Released on J-STAGE: March 28, 2008
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Kensei Kaneko, Yasushi Fukuzawa, Ryuichi Yamada, Takenori Harada, Yuji ...
Session ID: B07
Published: 2007
Released on J-STAGE: March 28, 2008
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Toshiyuki Yamauchi, Akira Okada, Kimihiko Arizono, Yoshiyuki Uno
Session ID: B08
Published: 2007
Released on J-STAGE: March 28, 2008
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In wire electrical discharge machining (WEDM), tungsten has been generally used as a wire electrode for fine precision machining, because high tension can be loaded. It is, however, very expensive, which leads to high cost of the product. A new brass coated piano wire with high tensile strength is being developed in order to attain high-speed and high-precision machining. Our previous reports clarified that the machining speed using the brass coated piano wire becomes higher than that using the conventional tungsten wire when the thickness and the chemical compositions of coated brass layer are optimum. In addition, higher tension can be loaded to the brass coated piano wire because the tensile strength is almost same as tungsten. In this report, the influence of wire surface oxidization on wire EDM characteristics was experimentally investigated using conventional tungsten wire and brass coated wire. As a result, the machining speed became higher by oxidizing the wire surface.
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Shunsuke Tomura, Masanori Kunieda
Session ID: B09
Published: 2007
Released on J-STAGE: March 28, 2008
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Relation of Discharge Frequency with Forming Characteristics of Micro-pin
Takayuki Tani, Hiromitsu Gotoh, JuKyoung Lee, Naotake Mohri
Session ID: B13
Published: 2007
Released on J-STAGE: March 28, 2008
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JuKyoung Lee, Kazuhiko Umeda, Takayuki Tani, Hiromitsu Gotoh, Naotake ...
Session ID: B14
Published: 2007
Released on J-STAGE: March 28, 2008
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Yutaka Tsuchida, Sotomitsu Hara
Session ID: B15
Published: 2007
Released on J-STAGE: March 28, 2008
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Masahito Kimori, Masanori Kunieda, Sadao Sano
Session ID: B16
Published: 2007
Released on J-STAGE: March 28, 2008
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Tomohiro Koyano, Masahito Kimori, Masanori Kunieda, Sadao Sano
Session ID: B17
Published: 2007
Released on J-STAGE: March 28, 2008
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Keiji Yukihiro, Yasushi Fukuzawa, Naotake Mohri, Nagao Saito
Session ID: B19
Published: 2007
Released on J-STAGE: March 28, 2008
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