Green Sand Mould Research Articles

Factors which cause Penetration in Steel Casting when Green Sand Molds are used and its Preventive Measure

Factors which cause Penetration in Steel Casting when Green Sand Molds are used and its Preventive Measure

鑄鐵生型鑄物の缺陷と生型砂の結合構造について（第2報） —生型砂の結合構造—

鑄鐵生型鑄物の缺陷と生型砂の結合構造について（第2報） —生型砂の結合構造—

Studies on Penetration and Burn-on in Steel Casting in Green Sand Mould

Studies on Penetration and Burn-on in Steel Casting in Green Sand Mould

Effect of Wooden Flour in the Green Sand Mould of the Steel Casting

Effect of Wooden Flour in the Green Sand Mould of the Steel Casting

STUDY ON Al-10%Mg CASTING ALLOY (REPORT I-II)

On Al-10%Mg casting alloy the authors investigated about metallographical, mechanical and properties, as well as about methods of melting, casting and heat-treatment.This alloy must be melted in graphite crusible lined with alumina at as posible as low temperature covered with chloride and fluoride flux.Excellent mechanical properties, especially high ductility and impact resistance, are destroied by addition of small content of Si, although it does not affect on corrosion, resistance.The alloy which is heat-treated according to DTD specification is slightly superior in the respect of mechanical properties, and on the contrary inferior in corrosion resistance to one according to JIS specification.The higher the temrerature of solution heat-treatment, the more rapidly increase mechanical properties. In the case of heat treatment, at 400°C, the longer the solution heat-treatment, the higher the mechanical properties, and at 440°C this alloy reach to maximum tensile strength by treatment to 6 hours, and by more duration of heat-treatment decrease this value.Properties of this alloy cast in various kinds of sand mould, green or baked, containing some protective reagents or none, finer sand or coarser, are compared. Green sand moulds give superior results and likewise addition of sulphor and ammonium sulphate. Enough large riser both in green mould and baked mould is essential to ensure excellent properties of this alloy.

Studies on the Strength Measurement of Green Sand Molds.

Studies on the Strength Measurement of Green Sand Molds.

The Research on Green Sand Mold (Rept. 3)

The Research on Green Sand Mold (Rept. 3)

Study on Pinholes of Steel Castings Cast in Green Sand Moulds

Study on Pinholes of Steel Castings Cast in Green Sand Moulds

薄物鋳造の研究（第6報）砂型における湯流れについて

薄物鋳造の研究（第6報）砂型における湯流れについて

鋳造の研究（第5報）上注ぎ，下注ぎ，段湯道における湯流れ

The investigation was carried out as to the metal flow in top, bottom, and step gates. Fine wire of high electric resistance is inserted in a mould space where the metal is filled, and the change of wire resistance caused by the flow of metal is recorded by Braun tube oscillograph. The experiment was carried out with pure aluminium cast at 750° into a green sand mould. The results are as follows: [1.] The shape of a gate attached to the pouring basin affects the metal flow remarkably. [2.] In top gate casting, flowing metal increases if the gate is longer, but there is a limit at which the flow is made constant. [3.] When a part of the gate is opened to the air within a certain length, the flowing metal decreases in volume. [4.] In bottom gate casting, the metal enters into the mould principally by a statical pressure head of metal in the gate.The flowing volume varies according to the size of bottom runner and is largest when the section of runner is 80% of that of the gate. [5.] In step gate casting, the entering time into the higher runner varies according to the size of the lower runner.