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Stepped quenching process and its apparatus suitable for bainite and martensite quenching

A technology of martensitic quenching and graded quenching, which is applied in the direction of quenching agents, quenching devices, heat treatment equipment, etc., can solve the problems of limited use of production lines, difficult quality assurance, and high energy consumption of equipment, so as to improve the quality of heat treatment and realize automatic operation , good hardening performance

Inactive Publication Date: 2006-12-27
北京时代新人轴承有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the traditional heat treatment process, such as difficult quality assurance, high equipment energy consumption, large waste, serious environmental pollution and limited use of production lines, etc., and provide a quenching process suitable for bainite and martensite Staged quenching process method and its automatic production equipment

Method used

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  • Stepped quenching process and its apparatus suitable for bainite and martensite quenching
  • Stepped quenching process and its apparatus suitable for bainite and martensite quenching
  • Stepped quenching process and its apparatus suitable for bainite and martensite quenching

Examples

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Embodiment 1

[0027] This embodiment is a stepwise quenching process for bainite, and the whole process is in figure 1 Shown is performed on a roll-bed multi-purpose production line. Its technological process includes the following steps:

[0028] a. Put the heat treatment parts on the material table 7, and send the parts into the roller hearth heating furnace 1 through the roller transmission device. The roller hearth heating furnace 1 is protected by a nitrogen-based controllable atmosphere, and the heating temperature is 860 °C ~870℃, according to the number and size of parts, the holding time is 0.5~3 hours;

[0029] b. The heated parts are sent out from the back door of the roller hearth heating furnace 1, and quickly put on the lifting quenching frame 10 with roller bars in the nitrate tank 2, quenched and isothermal, and the quenching temperature in the nitrate tank is 220 ℃~240℃, holding time is 0.5~1.5 hours;

[0030] In this embodiment, 4 stations are arranged in the nitrate ta...

Embodiment 2

[0037] This embodiment is a stepwise quenching process for martensite, and its process flow is the same as that of Example 1. The specific process parameters are as follows: in step a, the heating temperature of the heat-treated parts in the roller hearth heating furnace 1 is 820°C to 860°C; In step b, the quenching temperature of the parts in the nitrate tank 2 is 160°C to 170°C, and the temperature is kept for 5-10 minutes; in step e, the oil-cooled and cleaned parts are transferred to the air furnace 6 for isothermal tempering, The tempering temperature is 160°C-200°C, and the holding time is 3-5 hours.

[0038] In the roller bottom type multi-purpose production line equipment of the present invention, a high-pressure blower device 11 can be installed between the oil tank 3 and the cleaning machine 4. For some parts, after quenching in the nitrate tank, cooling in the oil tank is not used, and high-pressure air blower device 11 can be installed. The fan device 11 is directl...

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Abstract

This invention involves a kind of step quenching process which is suitable for Bainitic and Martensite quenching and the equipment utilizing this step quenching process. The workflow includes: heating, quenching in low-temperature nitrate groove and isothermal; turn to oil grooves to cool down, wash and dry; turn to air furnace for isothermal temper. The above step quenching is performed in roller hearth furnace production line. After adjusting the technology parameter, this production line can undergo Bainitic step quenching and Martensite step quenching. This production line is composed mainly by roller hearth heating furnace, nitrate groove, oil groove, cleaner, dryer and temper furnace. This invention can improve the heat treatment quality; reduce the amount of nitrate and pollution. This production line can undergo normal Martensite quenching, Martensite step quenching and Bainitic step quenching, so to reduce investiment and increase the effeiciency.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a staged quenching process suitable for bainite and martensite quenching and equipment used for the staged quenching process, belonging to the field of heat treatment of metal materials. Background technique [0002] Heat treatment of metal materials is an effective way to change and improve the properties of metal materials by heating and cooling, thereby increasing their service life. There are many types of heat treatment for metal materials, such as ordinary martensitic quenching, martensitic graded quenching and bainite quenching. Different quenching methods need to be equipped with different equipment. For example, the martensitic quenching process is generally to heat the parts in an air heating furnace. The parts are put into the tempering furnace for low-temperature tempering. In the past, the heat treatment of high-carbon chromium bearing steel in my country used this process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/19C21D1/20C21D1/22C21D1/62C21D1/607
Inventor 史立新邓铁松王占良司徒春陈志辉陶卫东陶治安
Owner 北京时代新人轴承有限公司
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