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Production method of high-iron brake disc

A production method and brake disc technology, applied in the direction of brake discs, brake parts, mechanical equipment, etc., can solve the problems of increased casting production difficulty, poor fluidity, high production costs, etc., to improve surface finish, reduce production costs, The effect of improving inner quality

Active Publication Date: 2017-09-15
LIAONING FU-AN HEAVY INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-speed rail brake discs have high requirements on material and casting precision. At present, ultra-pure ferritic stainless steel is generally used to make high-speed rail brake discs. The chromium content in the steel is very high and the carbon content is very low, which makes it easy to produce oxidized slag inclusions in the casting process; and because the high chromium steel is very easy to form a solid solution with oxygen in the air at high temperature to form subcutaneous pores, during the casting production process Due to poor fluidity, it is easy to produce cold shut; in addition, it is easy to oxidize at high temperature, and the surface of the casting is easy to produce oxide film wrinkles. The difficulty increases, thus increasing the difficulty of casting production
[0003] If the high-speed rail brake disc is cast with silica sand coated sand, its casting accuracy is often difficult to guarantee; in order to ensure the casting accuracy, some manufacturers use silica sol precision casting, and the surface finish and dimensional accuracy of the high-speed rail brake disc produced are relatively high, but Its production cost is high, and it causes serious environmental pollution

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  • Production method of high-iron brake disc
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  • Production method of high-iron brake disc

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Embodiment Construction

[0030] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0031] A method for producing a high-speed rail brake disc, comprising the steps of:

[0032] 1) Molten steel smelting; the molten steel used for casting high-speed rail brake discs is ultra-pure ferritic stainless steel, which is smelted by intermediate frequency furnace + LF-VOD refining; the specific process is as follows:

[0033] The chemical composition of the ultra-pure ferritic stainless steel is: C≤0.02%; Si 0.4%~1.0%; Mn0.4%~1.0%; P≤0.02%; S≤0.02%; Cr 22%~ 24%; Ni 1.5% ~ 2.0%; Mo2.5% ~ 3.5%; Nb 0.2% ~ 0.4%; V 0.5% ~ 1.0%; W 1.0% ~ 3.0%; the rest is iron and unavoidable impurities;

[0034] In front of the intermediate frequency furnace, a spectrometer is used to analyze the molten steel composition, and the furnace temperature is 1640 ° C ~ 1650 ° C;

[0035] The LF refining process is used to heat up the molten steel and adjust the ch...

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Abstract

The invention relates to a production method of a high-iron brake disc. The production method comprises the steps that (1) molten steel smelting is carried out, wherein molten steel for pouring the high-iron brake disc is ultra-pure ferritic stainless steel, and intermediate frequency furnace smelting and LF-VOD refining are carried out; (2) a full-automatic casting production line is adopted for casting the high-iron brake disc; (3) a cast high-iron brake disc casting is subject to shot blasting surface treatment, heat treatment and machining in sequence; and (4) finished product checkout is carried out. The ultra-pure ferritic stainless steel composed of special components is adopted in the high-iron brake disc, pouring is carried out after intermediate frequency furnace smelting and LF-VOD refining is carried out, the full-automatic casting production line is adopted, and bead coated sand is adopted for modeling and core building; according to the produced high-iron brake disc, various performance indexes meet the requirement, and the surface smoothness and the dimensional precision can reach the ludox precision casting level; and a new way is opened up for production of the high-iron brake disc.

Description

technical field [0001] The invention relates to the technical field of brake disc production, in particular to a production method of a high-speed rail brake disc. Background technique [0002] High-speed rail brake discs have high requirements on material and casting precision. At present, ultra-pure ferritic stainless steel is generally used to make high-speed rail brake discs. The chromium content in the steel is very high and the carbon content is very low, which makes it easy to produce oxidized slag inclusions in the casting process; and because the high chromium steel is very easy to form a solid solution with oxygen in the air at high temperature to form subcutaneous pores, during the casting production process Due to poor fluidity, it is easy to produce cold shut; in addition, it is easy to oxidize at high temperature, and the surface of the casting is easy to produce oxide film wrinkles. The difficulty increases, thus increasing the difficulty of casting productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/46C22C38/48C22C38/04C22C38/02C22C33/04C21C7/10B22C9/02C21D6/00C21D1/28F16D65/12
CPCB22C9/02C21C7/10C21D1/28C21D6/004C21D2211/005C22C33/04C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48F16D65/125
Inventor 吕世平穆建华石鹏张佳秋
Owner LIAONING FU-AN HEAVY INDUSTRY CO LTD
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