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Ductile iron castings

A technology for ductile iron and ductile castings, applied in the field of cast iron alloys, can solve the problems of high additional consumption costs for the use, repair and maintenance of molds, and achieve the effect of improving the tendency of quenching and cracking and ensuring the welding performance.

Active Publication Date: 2015-11-18
SAIC VOLKSWAGEN AUTOMOTIVE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molds made of such materials will bring high additional consumption costs for subsequent mold use, repair and maintenance

Method used

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  • Ductile iron castings
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  • Ductile iron castings

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0063] In the first embodiment, the weight of the ductile iron casting is 17.74 tons, and the ductile iron casting is the upper mold base.

[0064] 1. Calculate the content of each element according to the formula. In this embodiment, T=15, K=1.2, δ=T×K / 100=0.18, β=T / 150=0.1, then the composition range of each element in the material of the ductile iron casting can be determined. Within the composition range of each element in the material of the ductile iron casting, the composition of the elements in the material of the ductile iron casting in the first embodiment is obtained, as shown in Table 1.

[0065] The composition of elements in the material of the ductile iron casting described in the first embodiment of Table 1

[0066]

[0067] 2. Determine the pouring system of the lost foam resin sand casting ductile iron. The bottom pouring casting process and the open casting system are selected, and carbon defects are prone to appear on the upper surface of the lost foam...

no. 2 example

[0072] In the second embodiment, the weight of the ductile iron casting is 14.08 tons, and the ductile iron casting is the upper mold base.

[0073] 1. Calculate the content of each element according to the formula. In this embodiment, T=14, K=1.2, δ=T×K / 100=0.168, β=T / 150=0.093, then the composition range of each element in the material of the ductile iron casting can be determined. Within the composition range of each element in the material of the ductile iron casting, the composition of the elements in the material of the ductile iron casting in the second embodiment is obtained, as shown in Table 2.

[0074] The composition of elements in the material of the ductile iron casting described in the second embodiment of Table 2

[0075]

[0076] 2. Determine the pouring system of the lost foam resin sand casting ductile iron. The bottom pouring casting process and the open casting system are selected, and carbon defects are prone to appear on the upper surface of the los...

no. 3 example

[0081] In the third embodiment, the weight of the ductile iron casting is 13.16 tons, and the ductile iron casting is the upper mold base.

[0082] 1. Calculate the content of each element according to the formula. In this embodiment, T=13, K=1.2, δ=T×K / 100=0.156, β=T / 150=0.086, then the composition range of each element in the material of the ductile iron casting can be determined. Within the composition range of each element in the material of the ductile iron casting, the composition of the elements in the material of the ductile iron casting in the third embodiment is obtained, as shown in Table 3.

[0083] The composition of elements in the material of the ductile iron casting described in the third embodiment of Table 3

[0084]

[0085] 2. Determine the pouring system of the lost foam resin sand casting ductile iron. The bottom pouring casting process and the open casting system are selected, and carbon defects are prone to appear on the upper surface of the lost f...

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Abstract

The invention discloses a nodular cast iron casting. The non-ferrous alloy content of the nodular cast iron casting is calculated through a formula. Compared with the prior art, the contents of carbon and silicon are controlled to minimum the occurrence probability of shrinkage porosity and shrinkage void defects of the casting; a certain amount of chromium element is added to enhance part of nickel and copper elements so as to improve the quenching crack tendency; and besides, the magnesium content is strictly controlled to ensure the welding performance of the casting, the chromium content is strictly controlled to ensure the pearlite content in the casting, and the nickel-copper ratio is strictly controlled to ensure that the elongation percentage of the casting is greater than 5%.

Description

technical field [0001] The invention relates to the technical field of cast iron alloys, in particular to a ductile iron casting. Background technique [0002] Ductile iron has excellent high-temperature strength and oxidation resistance, and is used in fields such as passenger cars and industrial machinery. At present, in the automotive mold castings at home and abroad, in the case of small tonnage (less than 8 tons) castings, its performance can meet the needs of strength and other aspects. However, once the automobile mold casting exceeds 12 tons, the three most important indicators of the mold material, the strength of the casting, the hardness of the unquenched surface, and the hardness of the quenched surface, will all fail to meet the standards. The strength of the casting is not high, and the rigidity of the casting is poor. The drawing of the product is unstable, the hardness of the unquenched surface is not high, the product is easy to pull, the hardness of the qu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10
Inventor 杨光明岳文甲
Owner SAIC VOLKSWAGEN AUTOMOTIVE CO LTD
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