阅读说明：本技术 减震器轴承部件热处理方法 (Heat treatment method for shock absorber bearing component ) 是由 张文朝 于 2021-07-20 设计创作，主要内容包括：本发明提供了一种减震器轴承部件热处理方法,包括有以下步骤：步骤一,将加热炉中加热区域温度提升至810℃～850℃,并将轴承部件送入至加热炉加热区域中保温25分钟～30分钟；步骤二,将轴承部件送入235℃～245℃的盐浴池中,通过盐浴池中液体对流冷却；步骤三,等待轴承部件温度降低至接近室温时,采用60℃液体对轴承部件进行清洗20分钟；步骤四,待轴承部件温度再次恢复至接近室温,将加热炉中加热区域温度提升至160℃,并将轴承部件送入,维持120分钟；步骤五,将轴承部件空冷至室温,完成回火。针对现有技术的不足,本发明提供了一种减震器轴承部件热处理方法,其能够在轴承部件淬火后,保证足够的硬度过脆并避免翘曲度较大的问题。(The invention provides a heat treatment method for a bearing component of a shock absorber, which comprises the following steps: step one, raising the temperature of a heating area in a heating furnace to 810-850 ℃, and conveying a bearing component into the heating area of the heating furnace for heat preservation for 25-30 minutes; step two, conveying the bearing component into a salt bath at 235-245 ℃, and performing convection cooling on liquid in the salt bath; step three, when the temperature of the bearing part is reduced to be close to the room temperature, the bearing part is cleaned for 20 minutes by adopting liquid at the temperature of 60 ℃; step four, after the temperature of the bearing part is restored to be close to the room temperature again, the temperature of a heating area in the heating furnace is raised to 160 ℃, and the bearing part is conveyed in and maintained for 120 minutes; and step five, air-cooling the bearing component to room temperature to finish tempering. Aiming at the defects of the prior art, the invention provides a heat treatment method for a shock absorber bearing component, which can ensure enough hardness and over brittleness after the bearing component is quenched and avoid the problem of larger warping degree.)

1. A heat treatment method for a shock absorber bearing component is characterized by comprising the following steps:

step one, raising the temperature of a heating area in a heating furnace to 810-850 ℃, and conveying a bearing component into the heating area of the heating furnace for heat preservation for 25-30 minutes;

step two, conveying the bearing component into a salt bath at 235-245 ℃, and performing convection cooling on the bearing component for 30-50 minutes through liquid in the salt bath;

step three, cleaning the bearing part by adopting liquid at 60 ℃ for 20 minutes;

and step four, after the temperature of the bearing part is air-cooled to be close to the room temperature, raising the temperature of a heating area in the heating furnace to 160 ℃, feeding the bearing part, and after the temperature is maintained for 120 minutes, air-cooling the bearing part to the room temperature.

2. The heat treatment method for a shock absorber bearing part as set forth in claim 1, wherein: the material frame is used for placing bearing parts, the heating furnace is a roller-hearth heating furnace, and the material frame is displaced through a rotating roller of the roller-hearth heating furnace.

3. The heat treatment method for a shock absorber bearing part as set forth in claim 1, wherein: the salt bath pool adopts mixed liquid prepared from 50% of sodium nitrite and 50% of potassium nitrate.

Technical Field

The invention relates to a heat treatment method for a bearing component of a shock absorber.

Background

The bearing is an important part for the rotation support of a mechanical body, wherein the shock absorber bearing is a thrust bearing arranged on a shock absorber spring and a top plate, the thrust bearing has a greater requirement on strength and generally comprises an upper raceway ring, a lower raceway ring and other parts, each part of the shock absorber bearing in the prior art is mainly made of 65Mn spring steel materials, a heat treatment link exists in the processing of the parts, the quenching is completed by cooling quenching oil after the bearing part is heated in the prior art, but the cooling speed is too low, so that the bearing part after the quenching is insufficient in hardenability, and the bearing hardness and warping degree cannot meet the requirement.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a heat treatment method for a shock absorber bearing component, which can ensure enough hardness and over brittleness after the bearing component is quenched and avoid the problem of larger warping degree.

In order to achieve the above object, the present invention provides a heat treatment method for a bearing component of a shock absorber, comprising the steps of: step one, raising the temperature of a heating area in a heating furnace to 810-850 ℃, and conveying a bearing component into the heating area of the heating furnace for heat preservation for 25-30 minutes; step two, conveying the bearing component into a salt bath at 235-245 ℃, and performing convection cooling on the bearing component for 30-50 minutes through liquid in the salt bath; step three, cleaning the bearing part by adopting liquid at 60 ℃ for 20 minutes; and step four, after the temperature of the bearing part is air-cooled to be close to the room temperature, raising the temperature of a heating area in the heating furnace to 160 ℃, feeding the bearing part, and after the temperature is maintained for 120 minutes, air-cooling the bearing part to the room temperature.

The technical scheme has the advantages that: the bearing component is heated and insulated at 810-850 ℃, and then is sent into a 235-245 ℃ salt bath, the cooling process of the bearing component is divided into two stages, the temperature of the bearing component is cooled by convection of liquid in the salt bath at the relatively high stage from 810-850 ℃ to 235-245 ℃, so that the temperature of the stage is rapidly reduced, the temperature is rapidly reduced to 235-245 ℃ and then is subsequently reduced to the temperature close to the room temperature, the temperature is greatly reduced, the bearing component is rapidly cooled from the austenite temperature to the temperature with a slightly higher martensite transformation point (Ms) or slightly lower martensite transformation point (Ms), the thermal stress and the tissue stress can be reduced, the temperature is gradually reduced after being insulated for a certain time, and the hardenability and deformation of the workpiece are improved.

The invention may further be arranged to: the material frame is used for placing bearing parts, the heating furnace is a roller-hearth heating furnace, and the material frame is displaced through a rotating roller of the roller-hearth heating furnace.

Through further setting, drive the material frame displacement by the live-rollers of roller-hearth heating furnace, send the bearing part into the salt bath, avoid because the bearing part falls the difference that part product can produce slight striking each other and bearing part oil mode successively and cause the tissue to change different and produce different dimensional change in the time of different, make the product have the great problem of angularity in the free fall.

The invention may further be arranged to: the salt bath pool adopts mixed liquid prepared from 50% of sodium nitrite and 50% of potassium nitrate.

Through further setting, through the mixed liquid cooling of 50% sodium nitrite and 50% potassium nitrate ratio, guarantee not produce the steam film in the cooling process to the bearing part.

Drawings

FIG. 1 is a flow chart of an embodiment of the present invention;

FIG. 2 is a graph showing temperature variations according to an embodiment of the present invention.

Detailed Description

An embodiment of a method of heat treating a shock absorber bearing member according to the present invention is shown in fig. 1-2, and includes the steps of: step one, raising the temperature of a heating area in a heating furnace to 810-850 ℃, and conveying a bearing component into the heating area of the heating furnace for heat preservation for 25-30 minutes; step two, conveying the bearing component into a salt bath at 235-245 ℃, and performing convection cooling on the bearing component for 30-50 minutes through liquid in the salt bath; step three, cleaning the bearing part by adopting liquid at 60 ℃ for 20 minutes; and step four, after the temperature of the bearing part is air-cooled to be close to the room temperature, raising the temperature of a heating area in the heating furnace to 160 ℃, feeding the bearing part, and after the temperature is maintained for 120 minutes, air-cooling the bearing part to the room temperature. The material frame is used for placing bearing parts, the heating furnace is a roller-hearth heating furnace, and the material frame is displaced through a rotating roller of the roller-hearth heating furnace. The roller hearth type heating furnace is a heating furnace which is provided with a chamber-shaped hearth, the furnace bottom consists of a rotating roller and a transmission mechanism driving the rotating roller to rotate, and a material frame is formed from a feeding position to the outside of the furnace by the rotation of the rotating roller. In the embodiment, the method is completed by adopting a DREs-75/75/30-12-900CN type roller hearth heating furnace, wherein the material frame is arranged in a plurality of layers, and each layer adopts grids to separate a plurality of bearing components. The salt bath pool adopts mixed liquid prepared from 50% of sodium nitrite and 50% of potassium nitrate.

The above example is only one of the preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.