巻号一覧
後続誌
21 巻, 9 号
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論説
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安田 泰治, 関戸 悦郎1949 年 21 巻 9 号 p. 1-5
発行日: 1949/09/25
公開日: 2013/02/21
ジャーナル フリーThe easiest method to operate, S. G. method (speciffic gravity method, temporary named) was taken place to examine the value of its practical usage for Determine Clay Content, which is convenient to determine clay content in molding sands by short cut at a plant.
At first, as an experiment, a test was roasted by and by from normal temperature to 900°C. At every 100°C, S. G. method and washing process were done to be compared measuring clay content by agency of ignition loss. Results become as below :
1. S. G. method is done much easier than washing process at a plant.
2. It is rather hard to determine exact.
3. It is remarkable particularly that variation is different from kinds and condition of clay.
4. The result of washing process shows numbers anyhow proportional to ignition loss.抄録全体を表示PDF形式でダウンロード (570K) -
大内 卯之吉1949 年 21 巻 9 号 p. 5-10
発行日: 1949/09/25
公開日: 2013/02/21
ジャーナル フリーThis testing machine was developed from the necessity of testing the strength of oil sand. The surfaces of two of the same specimen for the AFA compression strength test are rubbed each other and from the amount of rubbed out material and the energy necessitated for rubbing a fixed quantity, the compression, tensile and bending strength for the moulding sand can be calculated. The above method is not only simpler but also quicker and more accurate than the usual strength testing method. Also the strength at the surface and at any depth of moulding sand specimen can be obtained. Further more as the stability of the mould and core which we are most interested in is revealed, the practicability of this method to the foundry engineers is very great.抄録全体を表示PDF形式でダウンロード (693K) -
住吉 榮蔵, 子安 三郎1949 年 21 巻 9 号 p. 10-14
発行日: 1949/09/25
公開日: 2013/02/21
ジャーナル フリーThis report is related the foundry practice for the castings of cupper-alloy ; each weights is 295kg, 200kg, 187kg and 120kg, thickness is 10～20m/m, demanding 7kg/cm2 pressure tight.
The successful production of castings chiefly depends upon their moulding sand, moulding technique, melting process, alloying and casting temperature.
Then discussed most suitable condition from the experiment deta and obtained the good results by used the follow method ;－
1) Pattern ; The pattern mad stricfle food of plain type so as to keep the cost of pattern making low.
2) Moulding ; Hand moulding and drying in ofen and graphite coating,
3) Machining allowance ; As a general rule, the as-cast surface is excellent for hydraulically soundness so that attached as possible as small machning allowance (2～2.5m/m)
4) Alloying and melting ;
Charge ;－Careful attention paid in the selection of scrap and employed the re-melting method
Composition ;－Cu 88%, Sn 10% Zn 2%
Furnace ;－ High frequency induction furnace capacity 150kw.
5) Flux ;－ p-Cu 0.02% charcoal 0.5%, fluorspar 0.01% in Weight percentage for 300kg charge.
6) Melting temperature ;－ 1350°C
7) Casting temperature ;－ 1250°C抄録全体を表示PDF形式でダウンロード (576K)
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