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A kind of preparation method of vermicular graphite cast iron braking material

A brake material, technology of vermicular graphite cast iron, applied in the field of preparation of vermicular graphite cast iron brake material, can solve the problem of material shaping reduction, achieve stable creep rate, stable quality, and ensure the effect of thermal conductivity

Active Publication Date: 2019-09-27
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Although it improves the strength and hardness of vermicular graphite cast iron by adding a higher content of Mn, it will reduce the plasticity of the material;
[0005] 2. The invention adopts Re-Mg-Ti-Ca vermicularizing agent, and carries out iron liquid treatment by flushing method to control the vermicular graphite cast iron. Since the vermicular graphite cast iron stable area is very small, the platform area will also change according to the change of production conditions. Constantly changing, although the invention can prepare vermicular graphite cast iron materials with a creep rate of 80%, it is difficult to control the creep rate above 80% stably

Method used

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  • A kind of preparation method of vermicular graphite cast iron braking material
  • A kind of preparation method of vermicular graphite cast iron braking material
  • A kind of preparation method of vermicular graphite cast iron braking material

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preparation example Construction

[0021] A preparation method of vermicular graphite cast iron brake material, comprising the following steps in sequence:

[0022] Pre-treatment of vermicularization: first put the molten iron obtained from smelting into the vermicularization treatment bag for scalding, then pour the vermicularization agent into the bottom of the vermicularization treatment bag for compaction, and cover and compact with inoculants and iron plates in turn , wherein, the mass percentage content of the S element in the molten iron is less than 0.015%, the described vermicular agent is a rare earth magnesium titanium vermicular agent, and its raw material composition and mass percentage content are: Re 6%-12%, Mg 5%- 10%, Ti 5%~10%, Si 40%~50%, Ca<4%, the balance is Fe and unavoidable impurities, and the mass ratio of the vermicular agent, inoculant, and molten iron is 0.4%~0.7% :0.3%~0.5%: 1;

[0023] Vermicularization treatment: Divide the molten iron after scalding into two parts, and then quic...

Embodiment 1

[0039] A preparation method of vermicular graphite cast iron brake material, comprising the following steps in sequence:

[0040] Pre-treatment of vermicularization: first add Sn and Cu to the bottom of the vermicularization treatment bag, then put the molten iron obtained by smelting in the intermediate frequency furnace into the vermicularization treatment bag for scalding, and then pour the vermiserative agent into the vermicularization treatment bag Compact the bottom, and cover and compact with inoculants and iron plates successively, wherein the mass ratio of Sn, Cu, and molten iron is 0.1%:0.6%:1, and the mass percentage content of S element in the molten iron is 0.01 %, the content of active oxygen in molten iron is 0.0062%, and the vermicular agent is a rare earth magnesium titanium vermicular agent, and its raw material composition and mass percentage content are: Re 10%, Mg 8%, Ti 8%, Si 45%, Ca 3%, balance is Fe and unavoidable impurity, described inoculant is 75Si...

Embodiment 2

[0044] Step is with embodiment 1, and difference is:

[0045] In the pre-treatment step of vermicularization, the mass ratio of Sn, Cu, and molten iron is 0.07%:0.7%:1, and the raw material composition and mass percentage content of the vermicularizing agent are: Re 6%, Mg 5%, Ti 5% , Si 50%, Ca 3%, the balance is Fe and unavoidable impurities, and the mass ratio of vermicular agent, inoculant, and molten iron is 0.7%:0.3%:1.

[0046] In the vermisification treatment step, the standing time is 1min, and the temperature after the vermisification of molten iron is 1550°C;

[0047] In the pouring inoculation treatment step, the pouring temperature is 1430° C., and the mass ratio of the inoculant to the molten iron is 0.2:1.

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Abstract

The invention relates to a preparation method for a vermicular graphite cast iron braking material. The preparation method comprises the following steps that firstly, molten iron provided with an S element of which the mass percentage is less than 0.015% and obtained by smelting is put into a vermicularizing treatment ladle for hot wrapping, a vermicular agent is poured into the bottom of the ladle for tamping and is sequentially covered with an inoculant and an iron plate and compacted, then the molten iron obtained after hot wrapping is completed is equally divided into two parts, a flushingmethod is adopted, one part of molten iron is quickly poured into the vermicularizing treatment ladle, then the other part of molten iron is slowly poured into the ladle, a covering agent is added tothe surface of the molten iron and then stands still to complete vermicularizing, and then stream inoculation is carried out while pouring. The vermicular agent is composed of, by mass percentage, 6-12% of Re, 5-10% of Mg, 5-10% of Ti, 40-50% of Si, less than 4% of Ca and the balance Fe and inevitable impurities. By the adoption of the preparation method, the vermicularizing rate of the vermicular graphite cast iron material is stably controlled to be more than 80%, and the mechanical property and wear resistance of the material are improved.

Description

technical field [0001] The invention belongs to the field of automobile brake materials, and in particular relates to a preparation method of a vermicular graphite cast iron brake material, which is suitable for stably controlling the creep rate of the vermicular graphite cast iron brake material at more than 80%, and improving the mechanical properties and performance of the material. wear resistance. Background technique [0002] According to the use conditions of the brake drum, its material must have sufficient mechanical properties, wear resistance and thermal fatigue resistance. For a long time, the material of the brake drum is mainly gray cast iron, which has low mechanical properties and cannot meet the requirements of heavy-duty commercial vehicles. Vermicular graphite cast iron has higher strength and toughness than gray cast iron, and has higher thermal conductivity and high friction coefficient, so it has a wide application prospect in the field of brake drums....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/12C21C1/08
Inventor 金通涂欣达袁福安霍卯田王林晏克春李学兵
Owner DONGFENG COMML VEHICLE CO LTD
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