巻号一覧
63 巻, 611 号
選択された号の論文の56件中51～56を表示しています
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今津 勝宏1997 年 63 巻 611 号 p. 2538-2543
発行日: 1997/07/25
公開日: 2008/02/26
ジャーナル フリーThe stretch draw method is applied to reduce the side wall thickness of a cup by a very sharp die radius under high backward tension. The temperature of stretch draw forming under dry conditions is high, compared with conventional redrawing. The purpose of this study is to clarify the friction characteristics of the laminated sheet, and the effects of tool temperature and punch speed on stretch draw forming. The results indicated that the kinetic friction coefficients (μk) on the laminated sheet change with glass transition temperature (Tg) having polyethylene terephthalate/ isophthalate copolymer (PET/I) film. In the case of higher tool temperatures, the thickness reduction rate is not affected by blank holding force (BHF) in the case of backward tension and punch speed is unrelated to thickness reduction. The surface temperature on the cup wall after the stretch draw forming is increased by approximately 1.5 times that of conventional redrawing.抄録全体を表示PDF形式でダウンロード (664K) -
王 英夫, 桝田 正美, 西口 隆, 秋山 秀俊1997 年 63 巻 611 号 p. 2544-2551
発行日: 1997/07/25
公開日: 2008/02/26
ジャーナル フリーAn experimental study of precision cutting of molding dies using single crystal diamond cutting tools for large Fresnel screens (size: T3×921×714 mm, Fresnel angle: 0.004-55.0), for improving the optical characteristics of the screens is described. The conclusions are as follows: (1) A burr is generated at the shoulder of the grooves during cutting, which causes compressed chip material to accumulate and laterally compress both sidewalls of the grooves; (2) The burr generation is suppressed by increase of the rake angle of the diamond cutters, decrease of the down feed rate, and reduction of stock removal; (3) Generation of a color corn on the Fresnel screen is caused by light escaping through non-lens surfaces; this is avoided by making the non-lens surfaces semi-transparent where the surface roughness is around 1μm Rmax Through use of the above-mentioned information to improve the cutting process, desirable optical characteristics were achieved for Fresnel screens used in projection TVs.抄録全体を表示PDF形式でダウンロード (943K) -
曽根 順治, 村田 弘, 高木 章二1997 年 63 巻 611 号 p. 2552-2557
発行日: 1997/07/25
公開日: 2008/02/26
ジャーナル フリーPressure control of the holding process in injection molding should be executed in such a manner as to minimize the variance of specific volume, since plastic lenses shrink greatly in holding processes and any distortion caused by shrinkage should be compensated by pressure control. In this report, we introduce a developed holding pressure I-P control system that has a nozzle pressure feedback mechanism. We designed three versions of the holding pressure control system and applied them to the plastic lens molding. We have shown experimentally that constant specific volume pressure control improves the dimensional accuracy and reduces strain in injection molding of thick molded parts. Of the three versions of the holding pressure control system, that involving average temperature control realizes the greatest improvement of shape accuracy and birefringence.抄録全体を表示PDF形式でダウンロード (713K) -
野島 武敏1997 年 63 巻 611 号 p. 2558-2563
発行日: 1997/07/25
公開日: 2008/02/26
ジャーナル フリーThe purpose of the present research is to develop a simple and convenient method of punching in intractable AFRP (aramid fiber reinforced plastics) laminated composites. An aramid plate is tightly restrained around the punched region as well as the bottom of the sample, and subsequently it is punched by a specially designed hollow punch. The present improved technique of press working has led to an excellent processing of intractable AFRP composites, which has never been achieved by any other technology such as water jet cutting or vibration press.抄録全体を表示PDF形式でダウンロード (900K) -
落合 芳博, 石田 良平, 広永 美喜也1997 年 63 巻 611 号 p. 2564-2569
発行日: 1997/07/25
公開日: 2008/02/26
ジャーナル フリーThis paper describes a method for generating a free-form surface by a boundary integral equation and mapping. This method requires knowing the boundary geometry of the free-form surface and setting arbitrary points on the free-form surface. First, a standard surface is developed onto a plain surface by mapping. The height of the points on the free-form surface is calculated, after solving the discretized boundary integral equation. These points are inverse-mapped onto the original space. In order to investigate the efficiency of this method, several examples are performed.抄録全体を表示PDF形式でダウンロード (703K) -
芳賀 善九, 仙波 卓弥1997 年 63 巻 611 号 p. 2570-2575
発行日: 1997/07/25
公開日: 2008/02/26
ジャーナル フリーLoose abrasives that are attracted to an electrode surface by an electrophoretic phenomenon should be fixed on an electrode suface to increase the machining efficiency. An anodic film that possesses the characteristic to grow continuously under the process of anodization of an aluminum alloy was employed as a binder of ultrafine silica abrasives. The effect of grain density, grain size, pH and chlorine ion density in the polishing fluid on the generation of the anodic film and the polishing efficiency was examined through the polishing test on a partially stabilized zirconia ceramic. It was revealed that the porous anodic film that was generated where the growth velocity of the anodic film was balanced with the erosion velocity of the barrier film could be used as the binder of loose abrasives. Also, it was confirmed that swarf loading decreased with increasing pore size of the anodic film so that the polishing efficiency increased with increasing pore size of the anodic film.抄録全体を表示PDF形式でダウンロード (1164K)