One-casting-multiple-yielding casting method of thin-walled framework castings

A casting and frame technology, which is applied in the field of casting, can solve the problems of deterioration of mechanical properties of ductile iron and hinder the popularization and application of thin-walled ductile iron, and achieve the effect of saving sand mold space, reducing casting defects, and reducing the appearance of white structure

Inactive Publication Date: 2018-11-16
宁波拓铁机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Because the thin-walled frame ductile iron castings are easy to form white structure (free cementite) during eutectic solidification, the structure is hard and brittle, which seriously deteriorates the mechanical properties of ductile iron and hinders the popularization and application of thin-wall ductile iron.

Method used

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  • One-casting-multiple-yielding casting method of thin-walled framework castings
  • One-casting-multiple-yielding casting method of thin-walled framework castings
  • One-casting-multiple-yielding casting method of thin-walled framework castings

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Experimental program
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Effect test

Embodiment 1

[0063] The chemical composition of the pouring solution is: C 3.70%, Si 2.50%, Mn 0.18%, P 0.02%, S0.010%, RE0.009%, Mg 0.040%, CE (carbon equivalent) 4.53%, and the balance is iron;

[0064] The pouring temperature is 1360°C;

[0065] The amount of nodulizer added is 1.25%, and the nodulizer is rare earth magnesium alloy: Mg 6.0%-7.0%, RE 1.5%-2.5%, Si 38%-42%, Ca2.0%-3.0%, Ba2.0% -3.0%5, Al≤1.2%, the balance is Fe.

[0066] The inoculant is silicon barium inoculant: Si71%-73%, Ca0.7%-1.3%, Ba1.6%-2.4%, Al≤1.2%, S≤0.02%, and the balance is Fe. The inoculant is added in two times, the first inoculation: the inoculation amount is 0.7% when iron is tapped; the second inoculation: the inoculation with the flow, the inoculation amount is 0.2%.

[0067] Carry out tissue inspection on the product body, if attached Figure 13-14 As shown in the accompanying drawings, it can be seen that the castings prepared by the method of the present invention have 2 grades of spheroidization and...

Embodiment 2

[0069] The chemical composition of the pouring solution is: C 3.80%, Si 2.45%, Mn 0.25%, P 0.026%, S 0.0085%, RE0.010%, Mg 0.045%, CE4.62%, and the balance is iron;

[0070] The pouring temperature is 1370°C;

[0071] The amount of nodulizer added is 1.30%, and the nodulizer is rare earth magnesium alloy: Mg 6.0%-7.0%, RE 1.5%-2.5%, Si 38%-42%, Ca2.0%-3.0%, Ba2.0% -3.0%5, Al≤1.2%, the balance is Fe.

[0072] The inoculant is silicon barium inoculant: Si 71%-73%, Ca0.7%-1.3%, Ba1.6%-2.4%, Al≤1.2%, S≤0.02%, and the balance is Fe. The inoculant is added in two times, the first inoculation: the inoculation amount is 0.65% when iron is tapped; the second inoculation: the inoculation with the flow, the inoculation amount is 0.22%.

[0073] Carry out tissue inspection on the product body, if attached Figure 15-16 As shown in the accompanying drawings, it can be seen that the castings prepared by the method of the present invention have 2 grades of spheroidization and no white str...

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Abstract

The invention relates to a one-casting-multiple-yielding casting method of thin-walled framework castings. The method comprises the steps: 1) die making; 2) sand core making; 3) sprue runner setting;4) casting forming, wherein the strength of a sand core is controlled to 0.8MPa to 0.9MPa in the step 2); the strength of external shape forming sand is controlled to 0.9MPa to 1.1MPa in the step 3);the requirements on casting fluid ingredient and casting fluid temperature during casting in the casting forming in the step 4) are as follows: casting fluid is prepared from chemical ingredients in percentage by weight: 3.65% to 3.80% of C, 2.20% to 2.65% of Si, less than or equal to 0.30% of Mn, less than or equal to 0.04% of P, less than or equal to 0.012% of S, 0.035% to 0.06% of Mg, less thanor equal to 0.02% of RE, 4.50% to 4.65% of CE and the balance of Fe; the addition of a nodulizer is 1.2% to 1.30%, and the addition of an inoculant is 0.8% to 1.0%; the temperature of the casting fluid is 1,350 DEG C to 1,380 DEG C. According to the method, the production efficiency of the thin-walled framework castings can be increased while the rate of finished products of the thin-walled framework castings is increased, and the castings are free of white microstructure and defects of shrinkage porosity, slag inclusion and the like.

Description

technical field [0001] The invention relates to the casting field of castings, in particular to a casting method for thin-walled frame castings with multiple castings. Background technique [0002] Energy saving and emission reduction has become an inevitable trend of development. In order to meet the needs of social development, modern equipment has also developed towards light weight, energy saving and high efficiency in recent years. Light weight of mechanical parts is an important way to save energy. Through the research and development of liquid forming technology for precision thin-walled ductile iron castings, the forming quality of castings has been improved, and deformation or damage caused by frequent stress during work can be avoided, thereby ensuring the life of mechanical equipment and realizing the lightweight of mechanical equipment. [0003] As we all know, the Fe-C phase diagram is a double duplicate phase diagram. Under different conditions, the molten iron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22B22C9/02C22C37/10C21C1/10B22C9/08C22C33/10
Inventor 张亚敏吴超项铮宇周宁
Owner 宁波拓铁机械有限公司
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