High strength and toughness wear-resistant ductile iron rocking arm and production method thereof

A wear-resistant ball and high-strength technology, applied in the field of casting, can solve the problems that the strength, toughness and wear resistance of ductile iron cannot be taken into account at the same time, and cannot meet the needs of the rocker arm of automobile engines, etc., and achieve good economic and social benefits, good strength and toughness. , safe to use

Active Publication Date: 2015-07-15
HANDAN LIANCHENG MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned nodular cast iron still has the disadvantage that the strength, toughness and wear resistance cannot be taken into account at the same time, and cannot meet the use requirements of the rocker arm of the automobile engine.

Method used

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  • High strength and toughness wear-resistant ductile iron rocking arm and production method thereof
  • High strength and toughness wear-resistant ductile iron rocking arm and production method thereof
  • High strength and toughness wear-resistant ductile iron rocking arm and production method thereof

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Effect test

Embodiment 1

[0034] Adopt 1000 kilograms of medium-frequency induction furnaces to smelt the high-strength toughness wear-resistant ductile iron rocker arm material of the present invention, and its specific manufacturing process steps are:

[0035] ①Heating and melting ordinary steel scrap, pig iron Q10 for ductile iron, recarburizer, ferrosilicon, copper plate and ferroniobium, adjusting the chemical composition and mass fraction of molten iron before the furnace to 3.46%C, 1.43%Si, 0.17%Mn, 0.17% Cu, 0.06% Nb, 0.036% S, 0.039% P, the balance is Fe and unavoidable impurity elements. When the temperature of the molten iron rises to 1522°C, the molten iron is taken out of the furnace and put into the spheroidizing ladle, and the spheroidizing ladle is pre-added Nodulizer, the particle size of the nodulizer is 32-45mm, the amount of the nodulizer is 1.0% of the mass fraction of the molten iron entering the nodulizer ladle, and the nodulizer is made of rare earth magnesium ferrosilicon alloy ...

Embodiment 2

[0038] Adopt 1000 kilograms of medium-frequency induction furnaces to smelt the high-strength toughness wear-resistant ductile iron rocker arm material of the present invention, and its specific manufacturing process steps are:

[0039]①Heating and melting ordinary steel scrap, pig iron Q12 for ductile iron, recarburizer, ferrosilicon, copper plate and ferroniobium, adjusting the chemical composition and mass fraction of molten iron before the furnace to 3.68%C, 1.32%Si, 0.19%Mn, 0.24% Cu, 0.03% Nb, 0.030% S, 0.036% P, and the balance is Fe and unavoidable impurity elements. When the temperature of molten iron rises to 1534°C, the molten iron is taken out of the furnace and sent to the spheroidizing ladle, which is pre-added Nodulizer, the particle size of the nodulizer is 32-45mm, the amount of the nodulizer is 1.2% of the mass fraction of the molten iron entering the nodulizer ladle, and the nodulizer is made of rare earth magnesium ferrosilicon alloy (rare earth magnesium fe...

Embodiment 3

[0042] Adopt 1000 kilograms of medium-frequency induction furnaces to smelt the high-strength toughness wear-resistant ductile iron rocker arm material of the present invention, and its specific manufacturing process steps are:

[0043] ①Heating and melting ordinary steel scrap, pig iron Q14 for ductile iron, recarburizer, ferrosilicon, copper plate and ferroniobium, adjusting the chemical composition and mass fraction of molten iron before the furnace to 3.58%C, 1.41%Si, 0.18%Mn, 0.19% Cu, 0.05% Nb, 0.032% S, 0.033% P, the balance is Fe and unavoidable impurity elements. When the temperature of molten iron rises to 1529°C, the molten iron is taken out of the furnace and put into the spheroidizing ladle, which is pre-added Nodulizer, the particle size of the nodulizer is 32-45mm, the amount of the nodulizer accounts for 1.1% of the mass fraction of the molten iron entering the nodulizer ladle, and the nodulizer is composed of a rare earth magnesium ferrosilicon alloy with a mas...

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Abstract

The invention discloses a high strength and toughness wear-resistant ductile iron rocking arm and a production method thereof, and belongs to the technical field of casting. The method comprises the following steps: carrying out mixing and heating fusion on common scrap steel, pig iron for nodular cast iron, a carburant, ferrosilicon, sheet copper and ferroniobium to obtain base molten iron, wherein the base molten iron comprises, by mass, 3.45-3.70% of C, 1.30-1.45% of Si, 0.20% or less of Mn, 0.15-0.25% of Cu, 0.03-0.06% of Nb, below 0.04% of S, below 0.04% of P, and the balance of Fe and inevitable impurity elements; and carrying out composite inoculation, spheroidization and multi-microalloying modification to obtain the ductile iron rocking arm. The obtained ductile iron rocking arm has the characteristics of fine graphite nodules, uniform distribution, good strength and toughness and good wear resistance, and has good use effects in automobile engines.

Description

technical field [0001] The invention discloses a ductile iron and a preparation method thereof, in particular to a high-strength and wear-resistant nodular iron rocker and a preparation method thereof, belonging to the technical field of casting. Background technique [0002] The rocker arm of the automobile engine is subjected to high-speed alternating loads, and friction and wear occur between the cam and the valve rocker arm assembly, which is a pair of important friction pairs in the engine. Because the graphite in the ductile iron exists in spherical form, it has the same wear resistance as the bearing alloy, and has the toughness similar to steel, as well as the excellent casting characteristics and fatigue resistance characteristics unique to cast iron. The rocker arm made of ductile iron saves expensive Bearing alloy bushings, so nodular cast iron is more and more widely used in automobile engine rocker arms. [0003] In order to improve the performance of nodular c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/10C22C37/04B22C9/22
Inventor 刘继光许孟山赵恩普符寒光刘云飞
Owner HANDAN LIANCHENG MACHINERY MFG CO LTD
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