Production technology of high strength and toughness high-speed train brake pad

Abstract

The invention relates to a production technology of a high strength and toughness high-speed train brake pad. The production technology specifically comprises the following steps: 1, a smelting working procedure: 1, preparing materials; 2, smelting; 2, a balling and inoculation working procedure: 1, balling, 2, molten iron discharging, 3, slagging off for the first time, 4, ladle-to-ladle inoculation, 5, slagging off for the second time; 3, a casting working procedure: 4, a thermal treatment working procedure; 5, a machining working procedure. In the production technology, parameters, such asselection of each raw material, matching and adding orders and adding modes, are controlled strictly, thus, post chemical components are controlled in an ideal range, a metallographic phase detectionindex of a cast product is excellent, mechanical property is outstanding, the technology is stable and has low rejection rate, and production requirements of a high-speed train gate are completely satisfied.

Description

technical field [0001] The invention belongs to the field of casting technology, in particular to a production process of a high-strength and high-toughness high-speed iron brake pad. Background technique [0002] High-speed rail brake pads usually use QT500-7 materials and QT400-18L materials, while ductile iron has the following problems, which limit its application in high-speed rail brake pads, such as: ductile iron tensile strength ≥ 600Mpa, extension The rate is ≥3%, the tensile strength is high, but the elongation is low, the toughness is poor, and the process is unstable, and the strength and elongation cannot be stably met at the same time. Qualified; 2), internal defects such as shrinkage are prone to occur, which cannot meet the requirements of the standard, resulting in batch waste. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to overcome the defects of the prior art, and to provide a production process for high-strength and high-t...

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Problems solved by technology

[0002] High-speed rail brake pads usually use QT500-7 materials and QT400-18L materials, and ductile iron has the following problems, which limit its application on high-speed rail brake pads, for example: the tensile strength of ductile iron ≥ 600Mpa, the extension Ratio ≥ 3%, high tensile strength, but low elongation, poor toughness, and unstable process, unable to meet the requirements of strength and elongation at the same time, prone to unqualified materials such as high tensile strength and low elongation Qualified; 2), internal defects such as shrinkage and porosity are prone to occur, which cannot meet the requirements of the standard, resulting in batch waste

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