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Cast iron for cast-iron brake drum

A brake drum, cast iron technology, applied in the direction of brake parts, etc., can solve the problems of cracking, brake drum cracking, etc., and achieve the effect of preventing failure, high thermal fatigue resistance, and overcoming stress concentration.

Active Publication Date: 2011-02-09
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adopting spherical and worm-like graphite to replace A-type graphite with sharp angles, it is to solve the sharp-angled A-type graphite, promote the initiation and expansion of thermal fatigue cracks, and cause early cracks in the brake drum, even The fatal problem of cracking

Method used

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  • Cast iron for cast-iron brake drum
  • Cast iron for cast-iron brake drum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The chemical composition of cast iron for cast iron brake drums is: C: 3.61; Si: 1.74; Mn: 0.46; P: 0.045; S: 0.026; Cr: 0.26; Cu: 0.36; Mg: 0.045; The rest is Fe.

[0025] Metallographic structure: 50% spheroidal graphite and 50% vermicular graphite are distributed on the dual-phase matrix of 70% pearlite and 30% ferrite at the same time.

Embodiment 2

[0027] The chemical composition of cast iron for cast iron brake drums is: C: 3.86; Si: 2.21; Mn: 0.041; P: 0.029; S: 0.021; Cr: 0.018; Cu: 0.028; For Fe.

[0028] Metallographic structure: 40% spheroidal graphite and 60% vermicular graphite are distributed on 60% pearlite and 40% ferrite dual-phase matrix at the same time.

Embodiment 3

[0030] The chemical composition of cast iron for cast iron brake drums is: C: 3.96; Si: 2.38; Mn: 0.34; P: 0.022; S: 0.014; Cr: 0.011; Cu: 0.022; For Fe.

[0031]Metallographic structure: 30% spheroidal graphite and 70% vermicular graphite are distributed on 50% pearlite and 50% ferrite dual-phase matrix at the same time.

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Abstract

The invention relates to an overweight heavy truck, in particular to cast iron for a cast-iron brake drum of the overweight heavy truck running on mountain roads or slopes and requiring frequent braking. Based on the chemical components of HT250, ferrite spheroidal graphite cast iron and ferrite vermicular iron, the chemical components of the cast iron are redesigned and comprise C, Si, Mn, P, S, Cr, Cu, Mg, RE and Fe; and the cast iron of which the spheroidal and vermicular graphite is distributed on a pearlite and ferrite diphase substrate simultaneously is obtained. The coexisting spheroidal and vermicular graphite replaces the A type graphite or single spheroidal graphite or single vermicular graphite in the traditional cast iron for the cast-iron brake drum; and the pearlite and ferrite diphase substrate replaces the single pearlite or ferrite substrate in the traditional cast iron for the cast-iron brake drum. The high-temperature strength of the brake drum is enhanced, the thermal fatigue resistance of the brake drum is improved and the service life of the brake drum is prolonged.

Description

technical field [0001] The invention relates to a brake drum of a heavy-duty truck, especially a cast iron brake drum of a heavy-duty truck that frequently travels on mountain roads or slope roads and needs frequent braking. Use cast iron. Background technique: [0002] The brake drum of a heavy-duty truck is one of the important security parts of the truck. At present, the life of the brake drums of heavy-duty trucks that often appear frequently on mountain roads or slope roads and require frequent braking is very low, generally 20,000-60,000 kilometers, and the main cause of failure is thermal mechanical fatigue. Cracks, resulting in cracks on the surface of the brake drum, or even cracks and failure. Our country consumes millions of brake drums every year, worth billions of dollars. Simultaneously, the safety of people and car is seriously threatened. Therefore, it is imminent to improve the life-span of the brake drum of the heavy-duty truck, which has great economic...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C37/06F16D65/02
Inventor 姜启川
Owner JILIN UNIV
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