鋳物

研究論文

キユポラ脱濕送風の効果

檜垣達, 池田滋, 岩永博, 仲田義雄

1955 年 27 巻 7 号 p. 365-369
発行日: 1955/07/25
公開日: 2012/11/12

DOIhttps://doi.org/10.11279/imono.27.7_365

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Several studies have been reported about the effect of dry-blast cupola-melting. In our foundry shop, in order to improve iron, we have been operating the dry-blast equipment of silica-gel for a 2 ton-cupola, and have confirmed that the melting condition and castability of the melt have been remarkably improved. And we have found that the dry-blast for cupola-melting is effective to produce good casting.

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熱風式熔銑爐操業に関する考察

沢田政雄

1955 年 27 巻 7 号 p. 369-379
発行日: 1955/07/25
公開日: 2012/11/12

DOIhttps://doi.org/10.11279/imono.27.7_369

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  To get uniform constituents of the melt and to result a uniform chill depth, it is indispensable to lessen the variation of CO₂ by giving adequate considerations on material control, and by blast volume or height of bed coke keep constant.
  The gists of this experiment are summarized as follows.
  1. The chill depth can be kept constant when the size of the charging materials and of the coke constant and also when the pressure of blast was adequately regulated. In this experiment, the pressure was 210∼230 mm aq.
  2. The combustion in the furnace must be controlled uniformly by making the blast volume at each tuyére uniform and also by making the direction of a tuyére horizontally.
  3. The consumption of bed coke is thought to be due to the excess volume of blast and also due to the carburization by high charging of steel scrap.
  4. In case of the height of bed coke is lowered, it is recommended to supply coke and regulate the blast volume.
  5. Chill test must be performed at every tapping. When the blast volume is constant and the height of bed coke is lowered, the chill, depth becomes wider gradually and vise versa.
  6. The characteristics of the melt is determined by CO₂ per cent which is contained in the atomosphere of a furnace consequently, it can be controlled rapidly by regulating the blast volume though the height of bed coke does not altered.
  7. The chill depth can be controlled within the range of ±2.0 mm by adding 40∼45% of steel scrap to the charging materials.
  8. If the ratio between the height of charging coke and that of bed coke is kept in an adequate value, the variation of CO₂ could be lessen.
  9. The quantity of every tapping melt is favoured to be a multiple of one batch.

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球狀黑鉛鑄鉄のイノキュレーションの研究

木下禾大, 佐野専一, 藤田修

1955 年 27 巻 7 号 p. 380-388
発行日: 1955/07/25
公開日: 2012/11/12

DOIhttps://doi.org/10.11279/imono.27.7_380

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  The influences of silicon and carbon inoculation for ductile cast iron were investigated. The results obtained are as follows.
  1) Chill depth and inverse chill decrease correspondingly with the increase of additional per cent of inoculant.
  The smaller the mass of casting, the more addition of inoculant is necessary to prevent inverse chill.
  2) For the melt which has not sufficient magnesium and which results in quasi-flake graphite, silicon inoculation has a remarkable effect of nodularizing. Carbon inoculation, too, gives very small effect on nodularizing.
  3) A number of graphite particles increase correspondingly with the increase of additional per cent of silicon inoculant, and the mean size of graphite particles varies adversely. Carbon inoculationn has the same effect which is smaller than that of silicon inoculation.
  4) Tensile strength and elongation are increased by silicon and carbon inoculation. These variation in mechanical properties correspond with the changes in forms and distribution of graphite.
  These phenomena, commonly recognized by silicon and carbon inoculation, may be due to the fact that the temperature of graphite crystallization becomes higher by inoculation. By the comparison of Si & C inoculation, the nucleus of graphite may be graphite itself.

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鑄物砂処理機の研究（第1報）

久恒中陽, 渡部多喜雄, 小野伊祐, 西山圭三

1955 年 27 巻 7 号 p. 389-395
発行日: 1955/07/25
公開日: 2012/11/12

DOIhttps://doi.org/10.11279/imono.27.7_389

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  In order to attain the higher results of sand control in foundries, the sand mulling operation must be given the most attention, because the maximum properties of sand mixtures are developed by mulling and they play a vital part in the production of higher quality castings.
  The Speed Muller is based on entirely new principle, namely the centrifugal force is utilized to provide the pressure essential to the proper mulling, the plows sweep the sand into the path of light weight, positively rotating, the rubber tired mulling wheels and the horizontally mounted wheels transmit the centrifugal force into high pressure squeezing and kneading action, so the sand is not crushed between the rubber tired wheels and the rubber liner, for the sand is mulled not on the bottom but on the periphery of the bowl.
  It mulls not completely and thoroughly all the sand mixtures to their maximum physical properties as fast as any other old type of mullers but produce just satisfactory sand with aerating and cooling action during the mulling.
  This report concerns the researches of the mechanism and the character of this machine used for sand mulling and it also concerns the comparison of sand properties correspondent to the change of the charging procedures.

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