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30 巻, 8 号
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研究論文
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本間 正雄, 目黒 博, 阿部 善彦, 大野 秢一1958 年 30 巻 8 号 p. 597-602
発行日: 1958/08/25
公開日: 2012/11/01
ジャーナル フリーWe investigated the Mg treated nodular cast iron (D. C. I.) by the reducing refining in the acid or basic electric arc furnace. The results obtained can be summarized as follows:
1) By the reducing refining, it is able to get a strong desulphurizing and deoxidizing action for molten iron. Necessary Mg amount for D. C. I. in cupola is about 0.4%, but in this case Mg amount is reduced, for example Mg amount in the case of basic furnace is 0.11 to 0.17%, and it is 0.18 to 0.23% in the case of acid furnace. By the reducing refining in electric furnace, the drosses get into casting and depth of skrinkage hole are reduced.
2) The test piece is made by JIS No. 4 type in a green sand mould and annealed to ferrite matrix. The results are as follows:
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3) By the reducing refining, it can get an excellent desulphurizing action for molten iron. The sulphur content of raw material is the range between 0.024 to 0.031%, but in the basic furnace smelting desulphurizing action is 65 to 96%, the range of sulphur content is between 0.001 to 0.010%, while in acid furnace desulpharizing action is 63 to 89%, the range of sulphur content is 0.003 to 0.011%.抄録全体を表示PDF形式でダウンロード (621K) -
音谷 登平, 丸山 益輝, 徳永 洋一, 原 光雄1958 年 30 巻 8 号 p. 603-608
発行日: 1958/08/25
公開日: 2012/11/01
ジャーナル フリーFrom the thermal analysis curves and microscopic structures of gray iron containing molybdenum and copper, it was concluded that the matrix structure depends upon the cooling rate within the temperature range of austenite and the amounts of alloying elements.
After adding molybdenum and copper to molten pig iron in a cupola, it was poured into a sand mould with four steps (10, 20, 30 and 40 mm in dia. respectively and 200 mm in total length). By microscopic observations on the matrix structures and hardness measurements, the structural diagram for acicular cast iron having a Brinell hardness of 240∼280 was determined.抄録全体を表示PDF形式でダウンロード (767K) -
牟田口 元堂1958 年 30 巻 8 号 p. 608-612
発行日: 1958/08/25
公開日: 2012/11/01
ジャーナル フリーPermeability of molds is affected by sand grains, binders and ramming. The author analyzed the permeability by there factors and worked out a way to construct the permeability from this analytical result.
That is : the permeability is computed by the following formula as :
F=K3×K2× Σ(fn×Wn)⁄ΣWn
where: F=permeability
K3= constant, refer to packing
K2=constant, refer to binder
fn=coefficient of permeability (=K1Dn2)
K1= constant, refer to grain size
Dn= mean diameter of sand grains
Wn=percent of sand grains retained
In this report, the author investigated how the permeability would change with the amount of binders. K2 is the ratio (ax/K1) of ax and K1 ; the former (ax) is a tangent of permeability and Dn2 when the amount of binder is changed, and the later (K1) is a tangent of permeability and Dn2 when a resin is used as a standard binder. Now, if the same sort of binder is used and only its additional amount is changed, ax is to be a constant as to a certain additional amount of said binder, Consequently, K2 can be determined by ax and K1.
Those rusults of permeability for green and synthetic sands which were computed by using K2 agreed very well with the measured results.抄録全体を表示PDF形式でダウンロード (546K) -
千々岩 健児1958 年 30 巻 8 号 p. 612-618
発行日: 1958/08/25
公開日: 2012/11/01
ジャーナル フリーThrough the detailed investigation made on the fluidity of molten metal in casting to which the step gates are attached, the author has obtained the following conclusions.
1) The condition of fluidity of molten metal in the step gates is affected by the sizes of sprue, ingate and the casting, besides the pouring rate of metal. In case of the pouring rate is fast, the molten metal flows back from casting to sprue through the upper ingate if the diameter of the ingate is smaller than that of sprue. To protect this flow back, the diameter of sprue should be chosen as about 80 percent of the diameter of ingate. In case of the pouring rate is slow, the flow back is hardly to occur if the diameters of sprue and in gate are same.
2) When the level of the molten metal in sprue exceeds the level of the upper ingate, the metal flows into the casting from both upper and lower ingates, however, the amount of inflow from the lower ingate is greater than that of from the upper ingate if the pouring rate is fast, and the opposite can be said when the pouring rate is slow.抄録全体を表示PDF形式でダウンロード (674K)
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