High carbon brake disc proportion and production process thereof

Abstract

The invention relates to the field of brake discs, and discloses a production process of a high carbon brake disc. The production process comprises the following steps: step I: adding a carburant intoa furnace; step II: adding molten iron, and adding the carburant of the same quantity with that in step I into the molten iron; step III: adding a pretreatment agent; step IV: adding alloy, heating,so that the temperature of the molten iron reaches 1450 DEG C; step V: sampling and checking the original molten iron; step VI: discharging at the temperature 1540 plus or minus 10 DEG C; step VII: adding a silicon-barium-calcium nucleating agent into a molten iron furnace (1); and step VIII: pouring the molten iron into the molten iron furnace (1), and nucleating by adopting silicon-barium nucleating agent. By virtue of the comparison of experiments, the high carbon brake disc proportion and the process with high performance can be obtained, and the tensile strength and hardness are excellent; and in addition, by designing the molten iron furnace, the nucleating agent is more uniformly sprayed, the time for adding the nucleating agent is retarded, pregnancy recession is avoided, the adding flow rate of the nucleating agent is controlled, the clustering of the nucleating agent is prevented, and the nucleating effect is improved.

Description

technical field [0001] The invention relates to the field of brake discs, in particular to the ratio of a high-carbon brake disc and its manufacturing process. Background technique [0002] Gray cast iron has always been the preferred material in the manufacture of automobile brake discs due to its good shock absorption, wear resistance, heat transfer, easy manufacturing and low cost. At present, the carbon equivalent of ordinary domestic automobile brake discs is usually around 3.8% to 3.9% (hypoeutectic cast iron). With the continuous improvement of automobile braking performance requirements, traditional gray cast iron materials have become more and more difficult to meet their needs. Domestic and foreign high-quality brake discs have better shock absorption, thermal conductivity, and anti-corrosion due to their high carbon equivalent. performance such as jitter. There is an approximate linear relationship between the thermal conductivity of gray cast iron and the amoun...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the disadvantages of the prior art, such as poor performance, easy to cause cracks, shrinkage and other casting defects, and provides a high-carbon brake disc ratio and its manufacturing process

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