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A technology of casting and hydraulic pressure, which is applied in the field of casting of hydraulic castings
Active Publication Date: 2021-07-06
宁波拓铁机械有限公司
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[0006] The present application aims at the above-mentioned deficiencies of the prior art, and provides a structure with fastening and high strength, which is not prone to defects such as sand drop, slag inclusion, and pores, and the structure of the hydraulic working surface of the obtained casting is smooth without casting defects and white spots. , which can meet the casting method of hydraulic castings used under high pressure conditions, without oil leakage and oil leakage
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Embodiment 1
[0068] (1) The raw material of following mass percentage is taken: 45% of pig iron, scrap steel 35%, return charge 20%, carburant: 1.0% of pig iron, scrap steel, return charge total amount;
[0069] (2) Put all the pig iron, steel scrap and returned charge into the smelting furnace, and then add the recarburizer with a total amount of 1.0% of the above formula; heat to melt the charge, and add FeSi75-C ferrosilicon and ferrosilicon after the charge is melted The amount of added iron is 0.8% of the total mass of pig iron, scrap steel and returned materials to obtain the original molten iron, and the original molten iron is continued to be heated to 1490 °C; the composition and mass percentage of the obtained original molten iron are C 3.58%, Si 1.45% , Mn 0.20%, P 0.025%, S 0.019%, and the rest is iron;
[0070] (3) Spheroidization: The spheroidization is carried out by the flushing method. The spheroidizing agent on one side of the spheroidizing bag is first added and compacte...
Embodiment 2
[0083] (1) The raw materials of the following mass percentages are taken by weighing: 50% of pig iron, 35% of steel scrap, 15% of recycled material, recarburizer: 1.1% of the total amount of pig iron, scrap steel, and recycled material;
[0084] (2) Put all the pig iron, scrap steel, and returned charge into the smelting furnace, and then add a carburant with a total formula of 1.1%; heat to melt the charge, and add FeSi75-C ferrosilicon and ferrosilicon after the charge is melted The amount of addition is 1.0% of the total mass of pig iron, scrap steel and recycled materials to obtain the original molten iron, and the original molten iron is continued to be heated to 1480 ° C; the composition and mass percentage of the obtained original molten iron are C 3.60%, Si 1.50%, Mn 0.18%, P 0.021%, S 0.018%, the rest is iron;
[0085] (3) The spheroidization is carried out by the flushing method. The spheroidizing dam on the side of the spheroidizing bag is firstly added with a spher...
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Abstract
The invention discloses a casting method of an oil pressure casting. The casting method of the oil pressure casting comprises the steps that sand mold manufacturing is conducted, iron liquid preparation is conducted, specifically, raw materials including, by mass, 45%-50% of pig iron, 30%-35% of scrap steel and 15%-25% of foundry returns are weighed; then a carburant which accounts for 0.7%-1.1% of the total amount of the pig iron, the scrap steel and the foundry returns is added; spheroidizing and inoculating are conducted, spheroidized iron liquid is slagged off and stood, and the iron liquid is poured into a casting system of the oil pressure casting in the step (1) when the temperature is reduced to 1370 DEG C-1400 DEG C so as to form a casting; metal-stream inoculation is carried out by using inoculation powder while pouring is carried out, and the addition amount of the inoculation powder is 0.08%-0.10% of the total mass of the raw iron liquid; and after the casting is cooled, the nodular cast iron oil pressure casting is obtained. The casting method of the oil pressure casting has the advantages that the structure is firm, the strength is high, the defects of sand falling, slag inclusion, air holes and the like are not prone to occurring, the oil pressure working face structure of the obtained casting is smooth and free of casting defects and white openings, and the method can be used under the high-pressure condition and is free of oil leakage and oil seepage.
Description
technical field [0001] The invention relates to the technical field of casting, in particular to a casting method of hydraulic castings. Background technique [0002] my country is a big country in the production and export of injection molding machines. As the development direction of precision injection molding machines, high-precision large-scale two-platen injection molding machines are highly valued by injection molding machine manufacturers. The development of a hydraulic system with high response speed, high precision and low overshoot is an urgent problem to be solved at present. The hydraulic control system is one of the core technologies of the injection molding machine, which directly determines the performance of the injection molding machine. The front plate of the injection molding machine, the front plate of the injection platform, and the gland, as the key components to ensure the reliable locking of the mold and the injection, directly affect the molding qu...
Claims
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Application Information
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