巻号一覧
後続誌
65 巻, 9 号
選択された号の論文の8件中1～8を表示しています
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研究論文
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顔 炳華, 任 秋明1993 年 65 巻 9 号 p. 695-699
発行日: 1993/09/25
公開日: 2011/06/22
ジャーナル フリーThis study mainly describes the effect of three sorts of surface condition on friction. Specimen surface was fabricated by grinding, electric discharge machining, and complex processes of EDM and grinding. By performing the experiments with the fabricated surfaces mentioned above in different EDM conditions, loads, and friction speeds, to check the most effective lubrication, we concluded the results as follows. Comparing with the other fabricated surfaces, we find that the friction coefficient of the surface fabricated by complex processes of EDM and grinding is the smallest, and retains a constant value for a long experimental friction distance, even over 1000 m.抄録全体を表示PDF形式でダウンロード (636K) -
佐藤 勉, 久保田 耕平, 柳 清隆, 二宮 隆二1993 年 65 巻 9 号 p. 700-705
発行日: 1993/09/25
公開日: 2011/06/22
ジャーナル フリーThe wear properties of Zn-Al-Cu alloys are measured using Amsler's wear machine. Al and Cu contents are varied in the range from 4 to 10 %, and 0 to 14 % respectively. The results are as follows. (1) The wear reductions of Zn alloys are almost the same in the conditions that do not occur remarkable wear such as jumping. (2) The type of the wear in this test is the adhesive wear. (3) The wear reductions become 2∼5 times when the load increases from 98 N to 392 N. (4) The remarkable wear, which is due to the deformation of the testing specimen, occurs in the conditions that the compressive strength of the alloy is less than 270 MPa to the load of 98 N, or less than 300 MPa to the load of 392 N.抄録全体を表示PDF形式でダウンロード (766K) -
池永 明, 川本 信, 鵜池 實1993 年 65 巻 9 号 p. 706-711
発行日: 1993/09/25
公開日: 2011/06/22
ジャーナル フリーTo clarify the effect of the direction of vibration on th flowing velocity into horizontal pipe and compactability of sand particle in vibrating flask for evaporative pattern casting, the compaction table tests were performed using vertical, horizontal and multi-axis vibrations with separate frequency (25-55 Hz) and acceleration (1.0-2.0 G) adjustments for each direction. The change in relative reduction C of volume of dry sand by vibration as a function of the vibrating time t can be expressed in the following equation : C = abt/(1 + bt), where a and b are constants. The value a and b are related mainly to the particle characteristics of sand and the magnitude of vibration respectively. The vibration of multi-axis (vibrate to both vertical and horizontal axes simultaneously) was more effective than comparable the vibration of the only axis (vibrate to vertical or horizontal axis direction) on both compaction and sand transport rates.抄録全体を表示PDF形式でダウンロード (802K) -
山本 成, 小野 修二, 福田 正勝1993 年 65 巻 9 号 p. 712-717
発行日: 1993/09/25
公開日: 2011/06/22
ジャーナル フリーThe authors investigated corrosion resistance and corrosion fatigue strength in city water of as-cast Cu-Mo added pearlitic Ductile Cast Iron (DCI). Results are summarized as follows : (1) The corrosion resistance of as-cast pearlitic DCI tends to be sensitive to obstacle ion, as compared with carbon steel casting. (2) Provided that cooling water contains max 50 ppm as S04-- and max 100 ppm as Cl-, inhibiter has to be added 6000 ppm ∼ 8000 ppm, in order to keep most superior corrosion resistance of as-cast pearlitic DCI. (3) In above (2) condition, if inhibiter is added over 6000 ppm, the corrosion fatigue strength of as-cast pearlitic DCI exceeds that of carbon steel casting, and recovers to fatigue strength of as-cast pearlitic DCI in air.抄録全体を表示PDF形式でダウンロード (669K) -
田上 道弘, 島津 勝也, 麻生 節夫, 後藤 正治1993 年 65 巻 9 号 p. 718-722
発行日: 1993/09/25
公開日: 2011/06/22
ジャーナル フリーZn-Al binary eutectic and Zn-Al-Cu ternary eutectic alloys are prepared by unidirectional solidification, and effects of anisotropy, testing temperature and heat treatment on the mechanical properties of the zinc alloy castings are studied. The tensile strength and the elongation decrease as an orientation angle θ between solidification direction and the tensile direction increases. The longitudinal specimens (θ = 0 rad) have the highest tensile strength and the longest elongation. The tensile strength is reduced by approximately a half of that of transverse specimens (θ = π/2 rad). The tensile strength of the longitudinal specimen decreases with increasing the testing temperature at 293∼373 K. At 373 K, the longitudinal specimens of the Zn-Al-Cu ternary eutectic alloy with 0.03 mass % Mg have the tensile strength 40 % higher than that of the specimen cast in a permanent mold and transverse specimens. The heat treatment does not improve the tensile strength of longitudinal specimen of the Zn-Al-Cu ternary eutectic alloy with 0.03 mass % Mg. This is due to coarsening of lamellar eutectic structures.抄録全体を表示PDF形式でダウンロード (697K) -
五家 政人, 西谷 弘信1993 年 65 巻 9 号 p. 723-729
発行日: 1993/09/25
公開日: 2011/06/22
ジャーナル フリーSpheroidal graphite iron has excellent ductility for a machined specimen, however a specimen with a cast surface shows very low ductility. This study reports how surface and heat-treatment in the production process affect the ductility of SG-iron with a cast surface. The factors examined are surface microstructures, heat treatment, shot blasting. The test method employed is three points bending tests for small test specimens in which observation and analysis on the initiation and propagation of cracks were made. Conclusions obtained are : (1) Ductility of specimen with a cast surface is much lower than one with a machined surface. The main reasons for this are pearlitic layer near surface in as-cast material and hardening effect by shot blasting in ferritized material. (2) Ductility of cast surface is improved by applying the combination treatment of shot blasting and low temperature annealing. (3) Ductility can be well evaluated by the parameter of growth rate of average crack length.抄録全体を表示PDF形式でダウンロード (752K)
解説
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目黒 勝1993 年 65 巻 9 号 p. 730-734
発行日: 1993/09/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (2837K)
技術報告
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藤澤 義之, 橘 史朗, 福田 剛士1993 年 65 巻 9 号 p. 735-739
発行日: 1993/09/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (2663K)
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