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Automotive brake disc and surface modification method thereof

A technology for automobile braking and surface modification, applied in the direction of brake discs, coatings, mechanical equipment, etc., can solve the problems of high sintering temperature, poor wear resistance, falling off, etc., to achieve broad market prospects, improve fatigue strength, Not easy to peel off effect

Inactive Publication Date: 2016-10-12
陈曦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Dacromet has the following disadvantages: Dacromet contains chromium ions that are harmful to the environment and human body, especially hexavalent chromium ions have carcinogenic effects; Dacromet has a high sintering temperature, a long time, and high energy consumption; Cromet's surface hardness is not high, wear resistance is not good, and Dacromet coated products are not suitable for contact and connection with copper, magnesium, nickel and stainless steel parts, because they will produce contact corrosion and affect the surface of the product Quality and anti-corrosion performance; the depth of Dacromet surface coating is not easy to control, and it is uneven, and it will fall off in harsh environments, affecting the surface quality and anti-corrosion performance of the product

Method used

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  • Automotive brake disc and surface modification method thereof
  • Automotive brake disc and surface modification method thereof
  • Automotive brake disc and surface modification method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. The surface modification method of automobile brake disc is as follows:

[0032] (1) Stress-relief annealing: choose gray cast iron with the brand name of HT250 to make the brake disc, and perform stress-relief treatment on the brake disc to eliminate the stress during the casting process of the brake disc. The stress-relief temperature is about 600°C;

[0033] (2) Primary vacuuming: transfer the brake disc to the oxidation furnace, and vacuumize the furnace pressure. After vacuuming, balance the furnace pressure with nitrogen;

[0034] (3) Pre-oxidation: Introduce purified air into the oxidation furnace, and perform pre-oxidation treatment on the brake disc. The treatment temperature is 400°C and the time is 50 minutes;

[0035] (4) Soft nitriding: transfer the brake disc to the nitriding furnace, and feed NH with a volume ratio of 10:1:9 3 , CO 2 and N 2 The mixed gas is used for nitrocarburizing, the temperature for nitrocarburizing is 590°C, and the furnace pr...

Embodiment 2

[0044] 1. The surface modification method of automobile brake disc is as follows:

[0045] (1) Stress-relief annealing: select the gray cast iron with the grade of HT300 to make the brake disc, and perform stress-relief treatment on the brake disc to eliminate the stress during the casting process of the brake disc. The stress-relief temperature is about 550°C;

[0046] (2) Primary vacuuming: transfer the brake disc to the oxidation furnace, and vacuumize the furnace pressure. After vacuuming, balance the furnace pressure with nitrogen;

[0047] (3) Pre-oxidation: Introduce purified air into the oxidation furnace, and perform pre-oxidation treatment on the brake disc. The treatment temperature is 380°C and the time is 55 minutes;

[0048] (4) Soft nitriding: transfer the brake disc to the nitriding furnace, and feed NH with a volume ratio of 10:1:9 3 , CO 2 and N 2 The mixed gas is used for nitrocarburizing, the temperature for nitrocarburizing is 560°C, and the furnace pre...

Embodiment 3

[0057] 1. The surface modification method of automobile brake disc is as follows:

[0058] (1) Stress-relief annealing: choose gray cast iron with the brand name of HT250 to make the brake disc, and perform stress-relief treatment on the brake disc to eliminate the stress during the casting process of the brake disc. The stress-relief temperature is about 600°C;

[0059] (2) Primary vacuuming: transfer the brake disc to the oxidation furnace, and vacuumize the furnace pressure. After vacuuming, balance the furnace pressure with nitrogen;

[0060] (3) Pre-oxidation: Introduce purified air into the oxidation furnace, and perform pre-oxidation treatment on the brake disc. The treatment temperature is 420°C and the time is 45 minutes;

[0061] (4) Soft nitriding: transfer the brake disc to the nitriding furnace, and feed NH with a volume ratio of 10:1:9 3 , CO 2 and N 2 The mixed gas is used for nitrocarburizing, the temperature for nitrocarburizing is 540°C, and the furnace pr...

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Abstract

The invention relates to an automotive brake disc and a surface modification method thereof. The surface modification method of the automotive brake disc comprises the following steps of (1) stress relief annealing, specifically, stress relief treatment is conducted on the brake disc; (2) vacuumizing for the first time, specifically, the brake disc is transferred into an oxidizing furnace, vacuumizing is conducted for the furnace pressure, and then the furnace pressure is balanced through nitrogen; (3) pre-oxidation, specifically, pre-oxidation is conducted on the brake disc; (4) tufftriding, specifically, the brake disc is transferred into a nitriding furnace, and nitrocarburizing is conducted; (5) rapid cooling for the first time, specifically, the brake disc is taken out of the nitriding furnace to be cooled rapidly; (6) vacuumizing for the second time, specifically, the brake disc is placed in the oxidizing furnace, vacuumizing is conducted for the furnace pressure, and then the furnace pressure is balanced through nitrogen; (7) post-oxidation, specifically, post-oxidation is conducted on the brake disc; (8) rapid cooling for the second time, specifically, the post-oxidized brake disc is cooled rapidly; and (9) vacuumizing for the third time, specifically, vacuumizing is conducted for the furnace pressure, then the furnace pressure is balanced through nitrogen, and the treated brake disc is taken out of the furnace. By the adoption of the surface modification method, the hardness, abrasion resistance, fatigue-resisting strength and high temperature-resisting engagement performance of the brake disc can be improved.

Description

technical field [0001] The invention belongs to the technical field of automobile brake disc manufacturing, and in particular relates to an automobile brake disc and a surface modification method thereof. Background technique [0002] Brake discs are the key braking components currently used in passenger cars and high-end trucks. The function of the brake disc is to use friction to stop the wheels rotating at high speed as soon as possible. According to incomplete statistics, there were 300,000 traffic accidents in my country last year, with an average of 900 cases per day, and 800 people lost their lives. There are various reasons for the accident. The most important reason is that the brakes fail at critical moments, and we can only wait for death. Therefore, the research on the brake system is imminent. After investigation and statistical analysis, 60% of brake failure comes from the failure of the brake disc. The failure of the brake disc is mainly caused by the followi...

Claims

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Application Information

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IPC IPC(8): C23C8/34C23C8/32F16D65/12
CPCC23C8/34C23C8/32F16D65/127F16D2250/0038
Inventor 陈曦
Owner 陈曦
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