著者

石野 亨

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.67, no.2, pp.118-123, 1995-02-25 (Released:2015-01-21)

参考文献数

25

著者

中井 実 斎藤 省三 岡林 邦夫

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.32, no.11, pp.765-772, 1960-11-25 (Released:2012-10-30)

参考文献数

8

---

Not a small amount is spent on the brake shoes in the expenditures of railway maintenance. And great efforts have been made to cut down this expense.   As a result of adapting High Phosphorus Cast Iron Brake Shoes, Kinki Nippon Railway Company has succeeded in cutting down much of the cost, by prolonging its life more than 45% in the year 1959 as compared with that of 1951. This reprot shows the following two points which prove the superiority of High Phosphorus Brake Shoes.   These results were obtained both by actual car tests and by laboratorial test. 1. It is possible to say that High Phosporus Cast Iron Brake Shoes of Kinki Nippon Railway Co. specification of about H.B.250 wear almost 20% less than most widely used Low Phosphorus Brake Shoes of about H.B.220. 2. When the effect on the wear of tire wheels is considered, it is also possible to say that when Low Phosphorus Cast Iron Brake Shoes are used, the degree of wear runs parallel with the hardness of the material. But when High Phosphorus Cast Iron Brake Shoes are used no tendency as mentioned above can be found, and it is also made clear that the use of High Phosphorus Cast Iron Brake Shoes is good for both wheels and Brake Shoes.

著者

土岐 光

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.61, no.2, pp.116-120, 1989-02-25 (Released:2015-01-27)

参考文献数

3

著者

神戸 洋史 東畑 透

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.64, no.12, pp.870-874, 1992-12-25 (Released:2015-01-22)

参考文献数

7

被引用文献数

6

著者

金子 淳 遠藤 彥美 鈴木 健治

出版者

Japan Foundry Engineering Society

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.24, no.4, pp.22-28, 1952

---

We have troubled ourselves about the pinholes of steel castings cast in green sand moulds, so studied the cause of the pinholes and made them clear to be in the relation to hydrogen gas.</br>  We made efforts chiefly to examine the influeuces of green sand factors on the pinholes, casting the samples of molten steel in various conditions of green sand moulds. And after analysed hydrogen gas of the samples, we checked up the fractures of them whether there were pinholes or not.</br>  The results obtained are as follows.</br> 1) It's proved that the pinholes of green sand mould castings are caused by hydrogen gas when it is contented over 8 cc.⁄100 gr. in the cast samples.</br> 2) When the clay % of green sand is 12% and moisture % is varried from 5% to 8%, hydrogen gas in cast samples increases with the increase of moisture, and the increased amounts are under 2 cc.⁄100 gr.</br> 3) When the moisture of green sand is 5% or 7%, and clay % is varried from 11% to 17%, hydrogen gas is most contented in the samples at about 15% of clay.</br> 4) Hydrogen gas shows some increases with the decrease of permeability from 400 to 140 A. F. A.</br> 5) The relation among moisture, clay and pinholes is cleared, and 5% moisture and 12% clay of green sand are standard % in order to get sound steel castings.</br> 6) The samples cast in green sand moulds are (3 c.c. ⁄ 100 gr hydrogen gas) more rich than samples cast in a copper mould from a ladle. Therefore the hydrogen gas in molten steel just before tapping must be kept under 4 c.c. ⁄ 100 gr, considering the increase of 1 c.c. ⁄ 100 gr during the interval from the furnace to the ladle.

著者

堤 信久 橋本 長人

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.63, no.11, pp.877-882, 1991-11-25 (Released:2011-07-08)

参考文献数

10

被引用文献数

1

---

Two antagonistic properties i. e., higher modulus of elasticity and higher damping capacity are required simultaneously to piano frame with gray iron castings. With a view of improving the quality of present frame, damping capacity, natural frequency and power spectrum of gray cast iron specimen were analyzed by measuring the sound emission when the center of the specimen held at two fixed positions by tungsten wires was hammered on specially designed experimental apparatus. From results obtained, it has been clarified that the changing of matrix to ferritic from pearlitic raises damping capacity, but decreases power spectrum. The changing of matrix to pearlitic or martensitic from ferritic, however, lowers natural frequency which has been thought as the parameter of modulus of elasticity of cast iron.

著者

大平 五郎 井川 克也

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.28, no.6, pp.403-409, 1956-06-25 (Released:2012-11-09)

参考文献数

8

被引用文献数

5

---

The eutectic of cast iron forms with a spheroidal crystallization front. The pattern, the number and the size of these eutectic cells vary with the amount of primary austenite and a small amount of so-called third elements, i. e. oxygen, sulphur, manganese and calcium-silicide.   The results obtained are as follows :   i) The number of eutectic cells of pure Fe-C alloy increases with carbon content up to 4.11% C and decreases at higher carbon contents. The former eutectic cells contain flaky graphite and the latter eutctic graphite.   ii) Small amount of oxygen and sulphur decreases the number of eutectic cells of oxygen in cast iron and converts flaky graphite into eutectic.   iii) The inoculation of calcium silicide to the cast iron melts containing oxygen or sulplur increases the number of eutectic cells and converts eutectic graphite into flaky.   iv) The addition of manganese to the cast iron containing sulphur can not completely convert eutectic graphite to flaky.   v) The types of manganese sulphide vary with the ratio Mn/S from massive angular type to elongated anchor type according to the decrease of the ratio.   vi) The inoculation of calcium silicide to the cast iron containing sulphur and manganese produces the small granuler type of manganese sulphide.

著者

高橋 忠生 多胡 博司 萬谷 信廣

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.66, no.5, pp.371-375, 1994-05-25 (Released:2015-01-21)

著者

山根 清一

出版者

Japan Foundry Engineering Society

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.13, no.1, pp.7-10, 1941

著者

山本 忠次

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.26, no.2, pp.84-94, 1954

---

&nbsp;&nbsp;By investigating the sand adhering phenomena on the foundry products and the laboratory specimens, the chief causes were analysed and therefrom the factors of its prevention were determined. </br>&nbsp;&nbsp;&ldquo;Burn-on&rdquo;, the phenomenon which is generally called for &ldquo;Hard adherence of sand or core&rdquo;, in Japanese foundries can be cl ssif ed into two types; one is the adhesion of fused and sintered sand on the casting surface, and the other is caused by the penetration of metal into the mould surface. The adhesion phenomena mostly found in foundries belong to the latter type, which was chiefly investigated in this work. </br>&nbsp;&nbsp;Macroscopic and microscopic examinations show that the slag formation between cast metal and the mould surface is an effective factor of preventing penetration, provided that the casting temperature, the solidifying time, the static pressure of metal, etc., are not extremely severe. </br>&nbsp;&nbsp;The oxidation of the interface between the metal surface and the mould is violent, and the penetrated metals are much decarbonized. Some examples of selective oxidation of Mn and Fe are listed-up by analysing the slag layer. </br>&nbsp;&nbsp;For the static pressure of molten metal, the result of the laboratory test and calculation show that the metal penetration is very remarkable when the blacking, slag formation and the back pressure do not exist. </br>&nbsp;&nbsp;From the thermochemical point of veiw concerning the process of penetration, it is concluded that the fundamental natures of moulding sand, that is, the high purity, good refractoriness and the round shape are the most important factors of preventing penetration. </br>&nbsp;&nbsp;In addition, required factors of preventing penetration in the foundry practice are summarized.

著者

太田 太郎 西川 幸男

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.32, no.5, pp.340-345, 1960

---

&nbsp;&nbsp;There have been ardent requirements for reducing troubles of bricklaying and repairing of cupola linings. New type of patching material was made of coarse Quarzite grain and fine Pyrophyllite grain. Reduction of ¹&frasl;₃ of labour and time and good results were obtained by practical use. Specimens of used patching material were tested by microscope, Spectral analysis and X-ray diffraction patterns.

著者

粟田 昌良 岩野 伸也 谷沢 治勇 吉田 章吾 山県 欽弥

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.32, no.12, pp.948-957, 1960-12-25 (Released:2012-10-30)

---

The mechanical properties of the specified tensile test bars and of the stepped and L-secctioned castings in aluminum bronzes (JIS. AlBC 1, 2 and 3) were determined. Preferable gating systems to produce the stepped and L-sectioned castings without defects were examined with radiographic technique. The castings made under those of careful conditions have a little scatter of the mechanical properties interioly and have a slight fall in the properties even in the heavy section.

著者

加藤 清隆 野崎 佳彦

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.62, no.9, pp.726-731, 1990-09-25 (Released:2011-07-27)

参考文献数

9

---

The basic research of ceramic core was carried out on the core which could be used solidification controled castings of Ni-base superalloy such as single crystal casting.  Fused silica was selected as a main material of core because of high leachability to aqueous alkaki solution, and the test piece of core was producted by press molding process.  When the burning temperature is 1300∼1320°C, this ceramic core shows very low thermal expansion ratio (0.1%) and the highest deflective strength at room temperature (about 20°C : 400 kgf/cm2). With the addition of 10∼20wt% cristobalite to fused silica, it restrains softening of the core at high temperature and shrinkage of the core after reburning.   Furthermore the influence of the grain size change of fused silica on the properties of the core was also investigated.

著者

青山 正治 横井 時秀 小林 俊郎

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.60, no.4, pp.240-245, 1988-04-25 (Released:2011-09-08)

参考文献数

11

被引用文献数

1

---

Spheroidal graphite cast irons containing four levels of Ni 0 to 3.5wt% and ones containing five levels of Mo 0 to 0.6wt% were prepared by the use of an induction furnace and cast. The iron into which Ni has been separately added has improved tensile strength and hardness because of solution hardening in the matrix. The impact transition temperature rises with condensation of Ni, while the upper shelf absorbed energy reduces. Separate addition of Mo has little effect on tensile strength and impact properties. Mechanical properties of spheroidal graphite cast iron can be improved by combined addition of Ni and Mo. The irons containing 1% Ni-0.1%Mo and 2.5%Ni-0.4%Mo show the lower impact transition temperature and have high toughness.

著者

辻川 正人 橋本 哲 川本 信

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.64, no.8, pp.526-530, 1992-08-25 (Released:2011-06-25)

参考文献数

7

被引用文献数

6

---

Thermit reaction was induced in molten aluminium silicon alloy by addition of coarse silica particles with stirring. Exothermic reaction commenced in the Al-Si eutectic melt at 1023 K. All silica particles were reduced into silicon in a brief period. Reduced silicon resolved into matrix melt. This thermit reaction produced α-alumina particles. These oxides were as large as added silica particles. After solidification, microstructures of specimens exhibited eutectic matrix, large primary silicon crystals and the oxide particles. A series of experiments were executed with magnesium addition before silica particles mixing. Magnesium quickened the dispersion of silica particles into matrix melt. So the thermit reaction occurred more rapidly and the highest temperature attained by the reaction was higher than those attained by the experiments without magnesium addition. The oxide particles resulted by experiments with magnesium showed a proof that the thermit reaction took place from outside to inside of silica particles gradually under high temperature.

著者

片島 三朗 田島 俊造 小竹 伸典

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.53, no.6, pp.289-294, 1981-06-25 (Released:2012-02-16)

参考文献数

5

---

Hot sand is produced with the systematization and speeding up of the casting line and is causing various problems. The relationship of compression strength, permeability, compactability and surface stability to sand temperature under various conditions was clarified, and variance of the properties of the hot sand when left to stand for given periods of time in air was also determined. A laboratory mixer was improved to enable high precision mixing of hot sand of the desired temperature. It was comfirmed that there is almost no change in the properties of the sand itself, but it was found that care must be taken because the values of permeability and compactability, when dealt with by the usual method, turn out to be altogether different from what they really are. Further, the importance of sand control from the time of mixing until molding has been confirmed, for, when the hot sand is left to stand in air, the variance becomes great, especially when the moisture is low (less than 3%) due to elevation of the temperature of the sand and prolongation of the time it is left standing.

著者

牟田口 元堂

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.30, no.7, pp.541-547, 1958-07-25 (Released:2012-11-01)

参考文献数

4

被引用文献数

5

---

The reason why the molten metal does not penetrate into the openings of sand grains is because of its great surface tension.   Thus, the author thinks that the penetration or blow as the casting defects seems to be related to the surface tension of molten metal, so that the critical limit of penetration or blow and the relation between penetration and washes of sand molds were investigated by using mercury, which surface tension and density are similar to those of molten metal, in this report.   From the results of the experiment, (1) the pressure which causes the penetration is inversely proportional to the size of the mold opening (2) the penetrating pressure increases when the back pressure exists (3) when the back pressure beyonds its critical range, the blow occurs regardless of the state of mold surface.

著者

橋本 建次

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.28, no.12, pp.899-904, 1956-12-25 (Released:2012-11-09)

参考文献数

12

---

An equation of the combined permeability of facing and backing sands is introduced and as its application, the relationship between permeability and surface roughness of castings was studied.   Main conclusions obtained were as follows :   1) The combined permeability of molding sands is calculated by the following equation             [Written in non-displayable characters.].       where H is height of each layer, K is permeability.   2) The above equation can be applied extensively to values of the permeability with a good accuracy.   3) The surface roughness of castings takes a minimum to a value of the combined permeability, which is changed by the mold surface or sand grain size, that is, with finer surface roughness of the mold the value declines to lower permeability. (Fig. 3) Therefore, in order to obtain fine surface roughness of castings, the combined permeability of facing and backing sands should be controlled properly according to mold surface roughness or sand grain size.

著者

松浦 誠 片島 三朗

出版者

Japan Foundry Engineering Society

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.54, no.10, pp.675-680, 1982

---

The effect of the jolt impact on the compaction of molding sand was investigated by measuring the acceleraion of the jolt table at the impact of jolting using a piezo-electric accelerometer. The mold density is directly influenced by the condition of the impact acting on the jolt table. The average mold density becomes higher as the magnitude of acceleration and the duration of impact of the jolt table increase. The acceleration inside the mold during jolting was also examined and it's behavior was anaslyzed in relation to the compaction process of molding sand. Further, experiments on the sand flow and mold density distribution in the mold were carried out. The mechanism of jolt compaction of molding sand is discussed.

著者

牧 正志

出版者

Japan Foundry Engineering Society

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.65, no.5, pp.420-425, 1993