High-strength and high-thermal-conductivity new material solid-liquid composite brake drum and preparation method thereof

A solid-liquid composite, high thermal conductivity technology, applied in the field of auto parts, can solve the problem that the service life of the composite brake drum has not been significantly extended, and achieve good economic and social benefits, excellent thermal conductivity, and improved wear resistance.

Active Publication Date: 2022-04-01
山西汤荣机械制造股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, none of the above inventions can achieve a good metallurgical combination of high-strength and high-toughness ductile iron in the outer layer and gray cast iron with high thermal conductivity in the inner layer, resulting in no significant extension of the service life of the composite brake drum.

Method used

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  • High-strength and high-thermal-conductivity new material solid-liquid composite brake drum and preparation method thereof
  • High-strength and high-thermal-conductivity new material solid-liquid composite brake drum and preparation method thereof
  • High-strength and high-thermal-conductivity new material solid-liquid composite brake drum and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A high-strength and high-thermal conductivity new material solid-liquid composite brake drum and its preparation method. The outer layer of high-strength ductile iron 1 and the inner layer of high thermal conductivity gray cast iron 2 are integrated by centrifugal solid-liquid composite casting. The specific preparation process steps are as follows:

[0035] ①Smelt nodular cast iron 1 and gray cast iron 2 with medium-frequency induction furnace respectively; first smelt nodular cast iron 1, mix and heat scrap steel, recarburizer, furnace charge and ferrosilicon, and control the chemical composition and mass fraction of molten iron at 3.51% C, 3.11% Si, 0.55% Mn, 0.0003% RE, 0.032% S, 0.037% P, the balance being Fe and unavoidable impurities; when the temperature of the molten iron reaches 1527°C, the molten iron is taken out of the furnace and sent to the spheroidizing ladle;

[0036] ② After all the molten iron enters the spheroidizing ladle, use a top-blowing spray gun...

Embodiment 2

[0042] A high-strength and high-thermal conductivity new material solid-liquid composite brake drum and its preparation method. The outer layer of high-strength ductile iron 1 and the inner layer of high thermal conductivity gray cast iron 2 are integrated by centrifugal solid-liquid composite casting. The specific preparation process steps are as follows:

[0043] ①Smelt nodular cast iron 1 and gray cast iron 2 in an intermediate frequency induction furnace respectively; first smelt nodular cast iron 1, mix and heat scrap steel, recarburizer, furnace charge and ferrosilicon, and control the chemical composition and mass fraction of molten iron at 3.88% C, 2.34% Si, 0.67% Mn, 0.0004% RE, 0.031% S, 0.037% P, the balance being Fe and unavoidable impurities; when the temperature of the molten iron reaches 1544°C, the molten iron is taken out of the furnace and sent to the spheroidizing ladle;

[0044] ② After all the molten iron enters the spheroidizing ladle, use a top-blowing sp...

Embodiment 3

[0050] A high-strength and high-thermal conductivity new material solid-liquid composite brake drum and its preparation method. The outer layer of high-strength ductile iron 1 and the inner layer of high thermal conductivity gray cast iron 2 are integrated by centrifugal solid-liquid composite casting. The specific preparation process steps are as follows:

[0051] ①Smelt nodular cast iron 1 and gray cast iron 2 with medium-frequency induction furnace respectively; first smelt nodular cast iron 1, mix and heat scrap steel, recarburizer, furnace charge and ferrosilicon, and control the chemical composition and mass fraction of molten iron at 3.64% C, 2.88% Si, 0.39% Mn, 0.0037% RE, 0.031% S, 0.036% P, the balance being Fe and unavoidable impurities; when the temperature of the molten iron reaches 1534°C, the molten iron is taken out of the furnace and sent to the spheroidizing ladle;

[0052] ② After all the molten iron enters the spheroidizing ladle, use a top-blowing spray gun...

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Abstract

The invention discloses a high-strength high-thermal-conductivity new material solid-liquid composite brake drum and a preparation method thereof, and belongs to the technical field of automobile parts. The composite brake drum is integrally cast by outer-layer high-strength ductile iron and inner-layer high-thermal-conductivity gray cast iron through centrifugal solid-liquid composite casting. Firstly, the outer layer of the composite brake drum is poured on an iron particle filling precoated sand shell production line, the iron particle filling precoated sand shell is fast in solidification and cooling, an obtained casting has the characteristics of fine and compact tissue, high strength and high toughness of outer ductile iron are ensured, on the basis, inner gray cast iron is poured under the centrifugal casting condition, and the composite brake drum is obtained. By controlling the centrifugal casting forming process, good metallurgical bonding of the inner layer and the outer layer is achieved, distribution of graphite is remarkably improved, and the composite brake drum has the advantages of being high in strength and heat conductivity. The service life of the composite brake drum is prolonged by more than three times compared with that of a common bimetal composite brake drum, and the composite brake drum has good economic and social benefits in application and popularization.

Description

technical field [0001] The invention discloses a solid-liquid composite brake drum and a preparation method thereof, particularly relates to a high-strength and high-thermal-conductivity new material solid-liquid composite brake drum and a preparation method thereof, and belongs to the technical field of auto parts. Background technique [0002] With the progress of my country's automobile technology and the improvement of automobile running speed, higher requirements are put forward for the performance of automobile braking performance and the performance of corresponding braking system components. The brake drum is a key component in the automobile braking system, and its performance directly affects the braking performance and even the safety of the automobile. When the car brakes, the brake pads exert pressure on the inner surface of the brake drum in the radial direction, so that a circumferential tension is generated therein. At the same time, due to the dynamic or st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/12C22C37/04C22C37/06C22C37/10B22D13/00B22D19/16
Inventor 曹全青马胜强靳宏斌王晓妍刘海洋符寒光
Owner 山西汤荣机械制造股份有限公司
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