Manufacturing method of vermicular graphite cast-iron brake drum

A technology of vermicular graphite cast iron and a manufacturing method, which is applied in the field of machining and manufacturing of mechanical parts, can solve the problems of reduced vanadium-titanium processing performance and increased processing cost, and achieves the improvement of mechanical properties, excellent mechanical properties, tensile strength and elongation. Effect

Inactive Publication Date: 2016-05-11
QINGTE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the patent "vanadium-titanium vermicular graphite cast iron brake drum and its preparation method" (CN102071352) is a typical preparation method of vermicular graphite iron brake drum, but the technology requires vanadium-titanium pig iron as the main raw material, and vanadium-titanium The machining performance is significantly reduced and the processing cost is increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A manufacturing method of vermicular graphite cast iron brake drum, using a vermicular agent containing Ce12-13%, the molten iron treatment temperature is 1480-1500 ℃, and adopts the punching method for spheroidization treatment; through the rapid metallographic method, triangular test block and spectrum Composition control is carried out to control the creep level control, so that the creep rate of the brake drum body can reach ≥50%; the vermicular graphite cast iron brake drum contains tin, and does not contain copper and chromium, wherein the content of tin is 0.04% , the tensile strength is 350-450MPa, the elongation is 2-5%; the vermicular graphite cast iron brake drum contains 30% spherical graphite, and the bending fatigue strength is 210N / mm 2 .

Embodiment 2

[0023] A manufacturing method of vermicular graphite cast iron brake drum, using a vermicular agent containing Ce12-13%, the molten iron treatment temperature is 1480-1500 ℃, and adopts the punching method for spheroidization treatment; through the rapid metallographic method, triangular test block and spectrum Composition control is carried out to control the creeping level, so that the creeping rate of the brake drum body can reach ≥50%; the vermicular graphite cast iron brake drum contains tin, and does not contain copper and chromium, wherein the content of tin is 0.06% , the tensile strength is 350-450MPa, the elongation is 2-5%; the vermicular graphite cast iron brake drum contains 30% spherical graphite, and the bending fatigue strength is 210N / mm 2 .

Embodiment 3

[0025] A manufacturing method of vermicular graphite cast iron brake drum, using a vermicular agent containing Ce12-13%, the molten iron treatment temperature is 1480-1500 ℃, and adopts the punching method for spheroidization treatment; through the rapid metallographic method, triangular test block and spectrum Composition control is carried out to control the creep level, so that the creep rate of the brake drum body can reach ≥50%; the vermicular graphite cast iron brake drum contains tin, and does not contain copper and chromium, wherein the content of tin is 0.1% , the tensile strength is 350-450MPa, the elongation is 2-5%; the vermicular graphite cast iron brake drum contains 30% spherical graphite, and the bending fatigue strength is 210N / mm 2 .

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Abstract

The invention belongs to the field of mechanical part machining and manufacturing and particularly relates to a manufacturing method of a vermicular graphite cast-iron brake drum. The manufacturing method is characterized in that vermiculizer containing 12-13% of Ce is used, molten iron processing temperature is 1480-1500 DEG C, and spheroidizing is performed by a pouring process. The vermicular graphite cast-iron brake drum manufactured by the method is excellent in mechanical performance, high in flexural fatigue performance and thermal fatigue performance, high in pearlite content, excellent in wear resistance, low in cost, and the like.

Description

technical field [0001] The invention belongs to the field of machining and manufacturing of mechanical parts, and in particular relates to a manufacturing method of a vermicular graphite cast iron brake drum. Background technique [0002] The brake drum is an important part of the car brake system and an important guarantee for the car's braking performance and safety. For heavy-duty vehicles, the brake drum is required to operate under heavy load without breaking, to have a long service life, and to be able to meet the braking distance of the vehicle. [0003] According to the application conditions of the brake drum, its material must have sufficient strength, hardness, wear resistance and thermal fatigue resistance. Among them, thermal fatigue resistance is the main performance index affecting the service life. For a long time, the brake drum material is mainly high-strength gray cast iron. In recent years, compacted graphite cast iron and metal matrix composite mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/08C21C1/08
CPCC22C33/08C21C1/08
Inventor 纪建奕杨茂德
Owner QINGTE GRP
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