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31 巻, 4 号
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研究論文
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木下 禾大, 藤田 修, 鵜池 実1959 年 31 巻 4 号 p. 233-242
発行日: 1959/04/25
公開日: 2012/10/31
ジャーナル フリーThe authors have investigated the effects of pan material on moulding sand. The results obtained are summarized as follows:
(1) The constituents of the so-called “pan material” which is gradually accumulated in a moulding sand are mainly clay pulverized sand, but small amounts of carbon and organic substance are also found.
(2) The increase of pan material results in the decrease of permeability and flowability, so the blow holes of the castings and the surface cracks of the dry sand moulds increase.
(3) It is shown that the temperature gradient in the mould during heating and cooling is enlarged by the addition of pan material, so the corresponding thermal stress is increased. The increase of surface cracks upon the addition of pan material may be due to the above fact.
(4) The increase of pan material which largely consists of silica results in the increase of scab and rat-tails, but the addition of pan material which largely consists of clay shows little effect on the formation of scab.
(5) The results of the experiments concerning the relationship among permeability, maximum back pressure and the blowing of poured metal shows that the increase of blow holes by the addition of the pan material is mainly due to the decrease of permeability.
(6) The increase of pan material in the moulding sand for steel castings results in the increase of sintering and the formation of gas holes.
(7) The above influences of the pan material are recognized in the case of backing sand as well as facing sand, but sometimes indirectly.
The above mentioned effects of the pan material appeared more sensitive in the case of fine-grained sand. So the pan material in fine moulding sand has to be removed more throughly than in the case of coarse sand.抄録全体を表示PDF形式でダウンロード (910K) -
山下 章, 尼木 敏雄, 常田 修, 中田 磊1959 年 31 巻 4 号 p. 242-248
発行日: 1959/04/25
公開日: 2012/10/31
ジャーナル フリーThe authors tried eight types of tests to learn the influence of clay content on mold wash.
Upon our selecting the mold wash through one or two types of tests, the casting defects ocurred often through other causes with the exception of the mold wash that we give attention to it.
Through the general judgement of these tests, the best content of bentonite to graphite is 6∼8% in weight.
But these tests were made under violent conditions, so under the best conditions clay content in the mold wash was greater than under ordinary casting conditions. Bentonite is better than Ball clay (Kirinendo) in comparatively low temperatures, and Kirinendo is some better than bentonite in high temperatures.抄録全体を表示PDF形式でダウンロード (781K) -
大平 五郎, 小泉 真人1959 年 31 巻 4 号 p. 249-255
発行日: 1959/04/25
公開日: 2012/10/31
ジャーナル フリーRunning of aluminium in a plate casting and its freezing are investigated by applying the electro-magnetic oscillograph and the thermometers to measure the temperatures of the flowing metal.
Pure aluminium was cast at 750° or 700° to the green sand mold described in Fig. 1, and the location of the gates are shown in that figure or in the succeeding photographs.
It has been confirmed that the temperature of that flowing metal and the beginning time of the solidification at each point in the plate are effected by the location of the gate. Also, the temperature of the running metal is responsible for the outer shrinkage of the plate, while that of the metal in a feeder is affected by the location of the feeder itself.
The results of the present investigetion are summarized as follows;
(1) The beginning of the solidification at each point in plate of 10 mm, thickness is effected by the temperature of the flowing metal, and it is rather changeable according to the running conditions.
(2) In a thick plate, the finishing time for the solidification in the top and bottom planes are influenced by the temperature of the flowing metal. The surface depression appears on the top plane of a plate, if the casting temperature is low or the casting time is long.
(3) Feeding of metal at each point in a plate is remerkably effected by the running condition, which causes a difference in cristal grains. When the metal keeps running accompanied by solidification, fine grains are obtained but coarse grains may be obtained by less disturbant solidification.
(4) The location of the feeder should be situated where the cold melt should not be mixed up in it from the thermal point of view.抄録全体を表示PDF形式でダウンロード (871K) -
榊原 広1959 年 31 巻 4 号 p. 256-267
発行日: 1959/04/25
公開日: 2012/10/31
ジャーナル フリーThe gating system has been studied from various points of view for example the minimizing of the casting defects. This report is such a study; it uses the theory of hydrodynamics, which is available to any fluid flow basically. But thd feature of this report is an analysis of the actual case of the production of pipe fittings in the foundry. As a result, it is found that the hydrodynamic theory should be applicable to the gating practice, if there has been some consideration of the process of heat transfer and metal solidification, which always accompany the melt flow.
The report is concerned with the observation of this and its numerical data, and finally its hydrodynamic treatment.抄録全体を表示PDF形式でダウンロード (991K) -
森永 卓ー, 吉田 章吾, 塩田 亘, 斎藤 方男1959 年 31 巻 4 号 p. 268-273
発行日: 1959/04/25
公開日: 2012/10/31
ジャーナル フリーUp to date an aluminium alloy which contains 20% silicon has been used in the manufacturing of points, because of its small thermal expansion coefficient. However, the grains of primary silicon in the alloy are coarse and the hyper eutectic structure reduces the mechanical properties of alloy itself.
Although some alloys when modified with Cu, Mg, Mn, Ni and Co are used, it is difficult to refine the grains of primary silicon in the alloy merely by adding these elements.
We noticed that the grains of primary silicon in the alloy were remarkably refined upon adding vanasin and vanasin together with phosphorus to the alloy.
We wish to report a study on how the forms of primary silicon in the alloy were influenced upon adding a quantity of vanasin to the alloy and how mechanical properties in the alloy used for making pistons were also remarkably improved.抄録全体を表示PDF形式でダウンロード (867K)
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