Vanadium-titanium vermicular cast iron brake drum and preparation method thereof

A technology of vermicular graphite cast iron and brake drum, applied in the field of preparation of automobile brake drum, can solve the problems of poor strength, wear resistance, thermal fatigue resistance and high production cost

Inactive Publication Date: 2011-05-25
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the material of the brake drum is mainly HT250, HT300, low-alloy cast iron and vanadium-titanium cast iron. The strength, wear resistance and thermal fatigue resistance of gray cast iron HT250, HT300 and vanadium-titanium cast iron are poor, while low-alloy cast iron is Adding Cu, Cr, Ni, Mo and other alloys can improve the strength and wear resistance, but the production cost is high

Method used

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  • Vanadium-titanium vermicular cast iron brake drum and preparation method thereof
  • Vanadium-titanium vermicular cast iron brake drum and preparation method thereof
  • Vanadium-titanium vermicular cast iron brake drum and preparation method thereof

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Effect test

Embodiment 1

[0041] The brake drum preparation method of embodiment 1 is as follows: configure the following components by weight percentage: carbon is 3.4%, silicon is 2.8%, manganese is 0.9%, phosphorus is 0.10%, sulfur is 0.07%, vanadium is 0.10%; Titanium is 0.10%, and the balance is iron and unavoidable impurities. The 1320°C high-temperature molten iron obtained after melting the vanadium-titanium magnetite is directly transferred to the intermediate frequency furnace for smelting, and the melting temperature is 1560°C. Before the molten iron is released from the furnace, the pouring treatment ladle is baked at 300°C, and then the vermicular agent, 2 / 3 of 75SiFe and polyslag are placed at the bottom of the ladle for compaction; the vermicular agent is made of rare earth ferrosilicon and rare earth magnesium ferrosilicon. Mixture, the percentage by weight of rare earth ferrosilicon in the vermicular agent is 60%, the specific composition of rare earth ferrosilicon and rare earth magne...

Embodiment 2

[0048] The preparation method of the brake drum of embodiment 2 is as follows: carbon is 3.7%, silicon is 2.6%, manganese is 0.7%, phosphorus is 0.09%, sulfur is 0.05%, vanadium is 0.2%; titanium is 0.15%, and the balance is iron and unavoidable impurities. The 1330°C high-temperature molten iron obtained after melting the vanadium-titanium magnetite is directly transferred to the intermediate frequency furnace for smelting, and the smelting temperature is 1530°C. Before the molten iron comes out of the furnace, the pouring treatment bag is baked at 350°C, and then the vermicular agent, 2 / 3 of 75SiFe and polyslag are placed at the bottom of the bag for compaction; the vermicular agent is made of rare earth ferrosilicon and rare earth magnesium ferrosilicon. Mixture, the percentage by weight of rare earth ferrosilicon in the vermicular agent is 70%, the specific composition of rare earth ferrosilicon and rare earth magnesium ferrosilicon is as shown in Table 1 and Table 2, the ...

Embodiment 3

[0051] The preparation method of the brake drum of embodiment 3 is as follows: carbon is 3.9%, silicon is 2.1%, manganese is 0.5%, phosphorus is 0.08%, sulfur is 0.03%, vanadium is 0.35%; titanium is 0.25%, and the balance is iron and unavoidable impurities. The 1350°C high-temperature molten iron obtained after melting the vanadium-titanium magnetite is directly transferred to the intermediate frequency furnace for smelting, and the melting temperature is 1500°C. Before the molten iron comes out of the furnace, the pouring treatment ladle is baked at 450°C, and then the vermicular agent, 2 / 3 of 75SiFe and polyslag are placed at the bottom of the ladle for compaction; the vermicular agent is made of rare earth ferrosilicon and rare earth magnesium ferrosilicon. Mixture, the percentage by weight of rare earth ferrosilicon in the vermicular agent is 80%, the specific composition of rare earth ferrosilicon and rare earth magnesium ferrosilicon is as shown in Table 1 and Table 2, ...

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Abstract

The invention discloses a vanadium-titanium vermicular cast iron brake drum and a preparation method thereof. The vanadium-titanium vermicular cast iron brake drum comprises the following components in percentage by weight: 3.4 to 3.9 percent of carbon, 2.1 to 2.8 percent of silicon, 0.5 to 0.9 percent of manganese, less than or equal to 0.10 percent of phosphorus, less than or equal to 0.07 percent of sulfur, 0.10 to 0.35 percent of vanadium, 0.1 to 0.25 percent of titanium, and the balance of ferrum and unavoidable impurities. The tensile strength of the vanadium-titanium vermicular cast iron brake drum is 354 to 421MPa and the Brinell hardness is 234 to 273HBW; the creep rate in a metallographic structure is 70 to 95 percent, and the pearlite content in a matrix is 60 to 90 percent. The performance indexes of the vanadium-titanium vermicular cast iron brake drum are higher than the performance indexes of the existing gray cast iron, vanadium-titanium cast iron and alloy cast iron; and the vanadium-titanium vermicular cast iron brake drum has good market prospect.

Description

technical field [0001] The invention relates to a preparation method of an automobile brake drum, in particular to a preparation method of a vanadium-titanium vermicular graphite cast iron brake drum. Background technique [0002] Automobile brake drum is the most common braking device, and it is also an important guarantee for the safe driving of automobiles. With the development of automobile technology, automobiles continue to develop in the direction of high speed and heavy load, which puts forward higher requirements for the braking performance of automobiles and the performance of the components of the corresponding braking system. Brake drums used in heavy-duty vehicles are required to operate under heavy loads without breaking, to have a long service life, to wear less on the shoes, and to meet the braking distance of the vehicle. Therefore, in addition to requiring high strength, the brake drum also pays special attention to the wear resistance and thermal fatigue ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C33/10
Inventor 李华基刘宁薛寒松马昌恒饶劲松宋东波
Owner CHONGQING UNIV
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