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High-strength automobile brake drum casting technology

A casting process and automobile braking technology, applied in the field of casting process, can solve the problems of high pearlite, high hardness, easy to produce abnormal noise and jitter, etc. of the brake hub, so as to prevent the occurrence of white spots, the amount of cementite is small, and it is difficult to brake. slippery effect

Inactive Publication Date: 2019-05-14
董林祥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the automobile brake hub produced by this method has high pearlite and high hardness. During use, cracks are prone to appear prematurely, especially during the braking process, defects such as abnormal noise and jitter are prone to occur.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] Put 10% of steel scrap into the intermediate frequency electric furnace to melt into molten steel, and then add carburant. When the temperature in the intermediate frequency electric furnace rises to 1100-1200°C, then add 0.15% of molybdenum, 30% of scrap steel, and 40% of pig iron. and 20% of the returned charge, then slagging, add ferromanganese 0.7% and ferrosilicon 1.8% after slagging, at this time, take samples from the molten iron in the intermediate frequency electric furnace for analysis, add materials, wait until the temperature in the intermediate frequency electric furnace When the temperature rises to 1450℃, the iron is tapped. At this time, 0.5% copper is added to the ladle together with the molten iron, and then poured. After 10 minutes, the casting is taken out, annealed to relieve stress, and cooled to room temperature. Shot blasting, machining, inspection After storage.

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PUM

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Abstract

The invention relates to a high-strength automobile brake drum casting technology and belongs to the technical field of casting technologies. During gray pig iron smelting, carbon, silicon, manganese,phosphorus, sulfur and chromium elements are contained in raw materials, in addition, two elements of copper and molybdenum are newly added, the weight percent of the adding amount of copper is 0.3%to 0.8%, and the weight percent of the adding amount of molybdenum is 0.1% to 0.2%. A high-strength automobile brake drum is formed through smelting, casting, forming, annealing, sand removing and machining.

Description

Technical field [0001] The invention relates to a high-strength automobile brake drum casting process, belonging to the technical field of casting processes. Background technique [0002] In the well-known high-strength automobile brake drum casting process, in addition to the carbon, silicon, manganese, phosphorus, sulfur, and other elements contained in the original material when the gray cast iron is smelted, the three elements of chromium, vanadium, and titanium are newly added, and the weight percentage of the added amount is Chromium 0.5-0.8%, vanadium 0.05-0.09%, titanium 0.05-0.09%, obtained by melting, casting, molding, annealing, sand cleaning, and machining. It can be seen from the iron-carbon phase diagram that chromium is a strong pearlite-promoting element, which increases the solubility of carbon in austenite in cast iron, thus hindering the nucleation and growth of ferrite, but in the solidification process, chromium promotes The role of cementite is also ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/06C22C33/08C21D1/30C21D5/00
CPCY02P10/20
Inventor 不公告发明人
Owner 董林祥
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