Nodular cast iron for rear axle housing of lorry and production method of nodular cast iron

A technology for trucks and nodular cast iron, which is applied to axles, wheels, vehicle parts, etc. It can solve problems such as difficult and difficult for manufacturers to produce stably, and achieve the effects of energy saving, excellent mechanical properties, and reduced casting costs

Inactive Publication Date: 2013-12-04
HENAN GUANGRUI AUTO PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of my country's automobile industry, the comprehensive performance requirements for the rear axle housing parts of trucks are getting higher and higher. It is difficult to stably produce high-grade, high-toughness as-cast ductile iron castings in large quantities. It is necessary to take into account the production cost, which is the main reason why it is difficult for many manufacturers to produce stably

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0029] Embodiment: a kind of nodular cast iron for the rear axle housing in a truck, its chemical composition is: carbon C 3.40~3.49%, silicon Si 2.35~2.55%, manganese Mn 0.50~0.60%, sulfur S≤0.025% , phosphorus P≤0.055%, rare earth RE 0.03~0.04%, magnesium Mg 0.04~0.06%, and the balance is iron Fe;

[0030] Among the nodular cast iron used for the rear axle housing of the truck:

[0031] The metallographic structure of the matrix structure is 20-45% pearlite, and the rest is ferrite;

[0032] Body mechanical properties: tensile strength σ b ≥500MPa, elongation δ≥10, nodularization level ≥3.

[0033] The production method of ductile iron for the rear axle housing in the above-mentioned truck, its specific technological process is as follows:

[0034] A. Molding operation: Furan resin sand is used, the particle size is 40-70 mesh, and the mud content is required to be ≤0.2%, SiO 2 ≥90%, the amount of furan resin sand added is 1.0-1.2%, and the amount of curing agent added ...

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PUM

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Abstract

The invention discloses nodular cast iron for a rear axle housing of a lorry. The nodular cast iron comprises, by weight percentage, 3.40-3.49% of C, 2.35-2.55% of Si, 0.50-0.60% of Mn, not more than 0.025% of S, not more than 0.055% of P, 0.03-0.04% of rear earth, 0.04-0.06% of Mg, and the balance of Fe. A production method the nodular cast iron includes: modeling with furan resin sand, using double connection of a cupola furnace and an electric furnace for smelting, adopting low spheroidizing temperature, paying attention to spheroidizing adding sequence, performing secondary drossing after spheroidizing, performing metal-stream inoculation during pouring, and controlling pouring time to pour the required nodular cast iron. The prepared nodular cast iron is excellent in mechanical performance, compact in matrix structure, low in cost, high in performance, competitive in market, and optimal for the rear axle housing, and adding of electrolytic copper is not needed.

Description

Technical field: [0001] The invention relates to a nodular cast iron for a rear axle housing of a truck and a production method thereof, which is used for producing a rear axle housing of a heavy truck. Background technique: [0002] With the development of my country's automobile industry, the comprehensive performance requirements for the rear axle housing parts of trucks are getting higher and higher. It is difficult to stably produce high-grade, high-toughness as-cast ductile iron castings in large quantities. It is necessary to take into account the production cost, which is the main reason why it is difficult for many manufacturers to stabilize production. Invention content: [0003] The technical problem to be solved by the present invention is: to overcome the shortcomings of the existing production process, to provide a kind of nodular cast iron for the rear axle housing in the truck and its production method, and to effectively reduce the production cost by using ...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C33/10C21C1/10B60B35/16
Inventor 柳靖李保国张平孙北方陈星海
Owner HENAN GUANGRUI AUTO PARTS
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