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Casting technology of automobile braking drum

A casting process and automobile braking technology, which is applied in the field of automobile brake drum casting technology and high-strength automobile brake drum casting technology, can solve the problems of high pearlite, high hardness, abnormal noise and vibration of the brake hub, etc. Achieve the effect of preventing white spots, less carburized body, and not easy to brake and slip

Inactive Publication Date: 2017-01-25
李芳
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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

[0022] 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 casting technology of an automobile braking drum, in particular to a casting technology of a high-strength automobile braking drum, and belongs to the technical field of casting technology. During smelting of gray cast iron, copper and molybdenum elements are newly added besides carbon, silicon, manganese, phosphorus, sulfur and chromium elements contained in raw materials, and the weight percentages of the added elements are respectively 0.3 to 0.8 percent for copper and 0.1 to 0.2 percent for molybdenum, and the braking drum is formed through melting, casting, forming, annealing, sand cleaning and machining.

Description

[0001] Technical field [0002] The invention relates to an automobile brake drum casting process, in particular to a high-strength automobile brake drum casting process. It belongs to the technical field of casting technology. Background technique [0003] 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 solidi...

Claims

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Application Information

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