Superficial layer carburization process for automobile hub

A kind of technology of automobile wheel hub and shallow layer, which is applied in the direction of metal material coating process, coating, manufacturing tools, etc., can solve the problems of high austenite content, affecting mechanical properties, surface hardness difficult to meet technical requirements, etc., and achieve residual austenite The effect of reducing the content of tensite and non-martensite, improving hardness and wear resistance

Active Publication Date: 2016-08-24
HANSHAN ZHAOXIA CASTING
View PDF13 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing carburizing and quenching process usually uses carburizing and precooling, followed by direct quenching, but the amount of residual austenite in the carburized layer after quenching is relative

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1:

[0027] A shallow carburizing process for an automobile wheel hub, comprising the following steps:

[0028] S1, impurity removal: clean the residual oil stains, dirt and burrs on the surface of the wheel hub;

[0029] S2. Ventilation: Put the wheel hub into the carburizing furnace, exhaust the air in the furnace, evacuate until the pressure in the furnace is -0.35MPa, fill with nitrogen protective gas, and raise the temperature in the carburizing furnace at a speed of 120°C / h. to 450°C, and then increase the temperature in the carburizing furnace to 860°C at a rate of 450°C / h;

[0030] S3, strong infiltration: 40m respectively 3 / h and 70m 3 Fill the furnace with methanol cracking gas and propane at the speed of / h; keep the carbon potential in the furnace at 1.1 and the constant temperature for 3.5h;

[0031] S4. Diffusion and cooling: adjust the furnace temperature to 845°C, adjust the carbon potential in the furnace to 0.95, and keep the constant temp...

Example Embodiment

[0034] Example 2:

[0035] A shallow carburizing process for an automobile wheel hub, comprising the following steps:

[0036] S1, impurity removal: clean the residual oil stains, dirt and burrs on the surface of the wheel hub;

[0037] S2. Ventilation: Put the wheel hub into the carburizing furnace, exhaust the air in the furnace, evacuate until the pressure in the furnace is -0.25MPa, fill with nitrogen protective gas, and put the carburizing furnace at a speed of 100-150℃ / h. The temperature was raised to 450°C, and then the temperature in the carburizing furnace was raised to 870°C at a rate of 420°C / h;

[0038] S3, strong penetration: 50m respectively 3 / h and 70m 3 Fill the furnace with methanol cracking gas and propane at a speed of / h; keep the carbon potential in the furnace at 0.9 and keep the temperature constant for 4h;

[0039] S4. Diffusion and cooling: adjust the furnace temperature to 840 °C, adjust the carbon potential in the furnace to 0.8, and keep the te...

Example Embodiment

[0042] Example 3:

[0043] A shallow carburizing process for an automobile wheel hub, comprising the following steps:

[0044] S1, impurity removal: clean the residual oil stains, dirt and burrs on the surface of the wheel hub;

[0045] S2. Ventilation: Put the wheel hub into the carburizing furnace, exhaust the air in the furnace, evacuate until the pressure in the furnace is -0.5MPa, fill with nitrogen protective gas, and raise the temperature in the carburizing furnace at a speed of 150℃ / h to 450°C, and then increase the temperature in the carburizing furnace to 870°C at a rate of 400°C / h;

[0046] S3, strong infiltration: 35m respectively 3 / h and 60-80m 3 Fill the furnace with methanol cracking gas and propane at a speed of / h; keep the carbon potential in the furnace at 1.2 and the constant temperature for 3.5h;

[0047] S4. Diffusion and cooling: adjust the furnace temperature to 845 °C, adjust the carbon potential in the furnace to 0.85, and keep the temperature co...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention relates to the technical field of hub production, in particular to a superficial layer carburization process for an automobile hub. The process comprises the following steps of impurity removal, ventilation, great permeation, diffusion, cooling, quenching and tempering. The thickness of the carburization layer of the hub obtained through the hub superficial layer carburization process is 2.5-3 mm, and the content of retained austenite and non-martensite of the outer superficial layer is effectively lowered; in addition, a great number of fine carbide particles which are distributed in a scattered mode are formed on the outer superficial permeation layer, and hardness and wear resistance of a hub steel piece are effectively improved.

Description

technical field [0001] The invention relates to the technical field of wheel production, in particular to a shallow carburizing process for automobile wheels. Background technique [0002] Most of the existing automobile wheels have low carbon content, and the material structure is composed of ferrite and pearlite. After quenching, it is mostly lath martensite; low-carbon steel has high toughness, low hardness, and poor wear resistance. For cars traveling at high speeds, it is not uncommon for tire blowouts and reduced braking performance to occur due to high temperatures generated by wheel hub deformation and braking. Due to the particularity of the working environment of the hub, many hubs are required not only to withstand impact loads, but also to wear resistance, so the hub needs to be carburized. Carburizing is a method of treating the metal surface, so that the activated carbon atoms decomposed in the carburizing medium penetrate into the surface layer of the steel p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C23C8/22C21D1/18C21D9/34
CPCC21D1/18C21D9/34C23C8/22
Inventor 黄远霞
Owner HANSHAN ZHAOXIA CASTING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap