CN101629228A - Heat treatment method for elastic part - Google Patents
Heat treatment method for elastic part Download PDFInfo
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- CN101629228A CN101629228A CN200810068827A CN200810068827A CN101629228A CN 101629228 A CN101629228 A CN 101629228A CN 200810068827 A CN200810068827 A CN 200810068827A CN 200810068827 A CN200810068827 A CN 200810068827A CN 101629228 A CN101629228 A CN 101629228A
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- elastic part
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Abstract
The invention provides a heat treatment method with simple process, good heat treatment effect, energy conservation and low production cost for an elastic part. By raising the quenching temperature of the elastic part from 860+/-10 DEG C to over 900 DEG C, a metallographic structure of a material becomes lath martensite, the number of dislocated martensite is increased, and further the toughness is improved and the potential of the material is developed. The heat treatment method for the elastic part comprises the following steps: 1, quenching, wherein the quenching temperature is raised, the part is heated in a furnace having a temperature of 900+/-50 DEG C and is subjected to heat preservation for 5 to 10 minutes, and then the part is taken out and cooled in oil of between 40 and 80 DEG C; and 2, tempering, wherein the tempering is performed in a saltpeter groove, and when the temperature of the part is lowered to between 300 and400 DEG C, the heat preservation is performed for 40 to 60 minutes, and then the part is cooled in water of between 20 and 60 DEG C.
Description
Technical field
The invention belongs to the heat treatment technics field, relate to a kind of heat treating method of elastic part.
Background technology
At present, at heat treatment industry, the heat treating method of handling elastic part is the bainite isothermal, 860 ± ℃ quenching, and lower bainite is organized in 340 ± 30 ℃ of tempering.The advantage of this method is: internal stress is low, is out of shape for a short time, and lower notch sensitivity and crack sensitivity are arranged under static load, and lower tired notch sensitivity is arranged under repeated load.But this method production cycle is long, and equipment and technology requires high, causes the waste of a large amount of manpowers and the energy.
Summary of the invention
The present invention be directed to the deficiency of existing working method, it is simple that elastic part has been proposed a kind of technology, and thermal effectiveness is good, save energy, and the heat treating method that production cost is low has solved equipment and technical problem.
The present invention realizes with following technical scheme: the heat treating method of elastic part comprises
1. quench: improve quenching temperature, part was placed in 900 ℃ ± 50 ℃ the stove heat tracing 5～10 minutes; Take out part then, the oil of putting into 40～80 ℃ cools off;
2. tempering: in the nitre groove, carry out, when the part temperature is reduced to 300～400 ℃ of temperature, be incubated 40-60 minute; The water that part is put into 20～60 ℃ cools off.
The processing method that the present invention adopts is characterised in that the quenching temperature that improves elastic part, promptly brings up to more than 900 ℃ from 860 ± 10 ℃.The metallographic structure that obtain this moment is a lath martensite, shows as the tissue of a branch of bundle fine strip shape at microscopically, separate with low-angle boundary between the bar in every bundle and the bar, bundle with restraint between have bigger phasic difference.A large amount of experiments show that martensitic intensity depends mainly on its carbon content and weave construction thereof, and martensitic toughness depends mainly on its substructure.The substructure of lath martensite is mainly dislocation, and under same intensity, dislocation type martensite has high retrospective that manys and good toughness than twin type martensite, the advantages such as transition temperature is low of also enbrittling.When other condition was identical, dislocation type martensite had higher intensity and good toughness, therefore by certain means, under the situation that guarantees sufficient intensity, increasing the quantity of dislocatrion martensite, will be further to improve toughness, the effective way of performance material potentiality.The quenching structure that obtains during 50CrVA steel normal quenching is lath martensite+plate martensite, and heat is quenched, and then can obtain more even almost all is lath martensite.The processing method that we adopt is promptly quenched more than 900 ℃, and what obtain is organized as lath martensite.Non-microcracked generation in the lath martensite tissue, though tempering temperature is in first kind temper brittleness district, but dislocation substructure and brittle transition temperature that lath martensite has are low, make part guarantee to satisfy not occur the temper brittleness phenomenon under the technical request.
Part by the present invention handles has the hardness height, the characteristics of retrospective and good toughness.
Embodiment
Implementation column 1:
According to the method described in the present invention, flexible collar used on the automobile is heat-treated, material therefor is 50CrVA.This kind flexible collar is placed in 940 ℃ of salt stoves heating 6 minutes, in 50 ℃ oil, cools off subsequently; Tempering is put into 350 ℃ nitre groove with part, is incubated 60 minutes, then, cools off in 20～60 ℃ water.The hardness of the flexible collar of Zhi Zaoing like this, technical indicators such as clamping force all reach bainite isothermal heat treatment requirements, satisfy service requirements.Table 1 is the measured hardness of different inner diameters size flexible collar, the clamping force data.
Table 1:
| Internal diameter size | Technical indicator | Hardness HRC | ??F(X) | ??F(Y) | ??ΔF |
| ??φ20 | ??HRc：50～53 ??F(X，Y)：≥100N ??ΔF＜40N | ??50.5～52.5 | ??257～275 | ??243～238 | ??14～37 |
| ??φ27.8 | ??HRc：50～53 ??F(X，Y)：≥150N ??ΔF＜60N | ??50.5～52 | ??271～269 | ??259～242 | ??12～27 |
The heat-treatment technology method of flexible collar of the present invention is simple, is easy to promote, and is suitable for the thermal treatment of elastic part.
Claims (1)
1, a kind of heat treating method of elastic part by improving the quenching temperature of elastic part, improves the metallographic structure of material, and it is characterized in that: heat treatment process is
A. quench: part was placed in 900 ℃ ± 50 ℃ the stove heat tracing 5～10 minutes, and took out part, in 40～80 ℃ oil, cool off;
B. tempering: when the part temperature is reduced to 300～400 ℃ of temperature, is put in the nitre groove and is incubated 40-60 minute, the water of then part being put into 20～60 ℃ cools off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810068827A CN101629228A (en) | 2008-07-15 | 2008-07-15 | Heat treatment method for elastic part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810068827A CN101629228A (en) | 2008-07-15 | 2008-07-15 | Heat treatment method for elastic part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101629228A true CN101629228A (en) | 2010-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810068827A Pending CN101629228A (en) | 2008-07-15 | 2008-07-15 | Heat treatment method for elastic part |
Country Status (1)
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| CN (1) | CN101629228A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103849742A (en) * | 2012-11-29 | 2014-06-11 | 中国航空工业标准件制造有限责任公司 | Heat treatment process for steel elastic part |
| CN109439856A (en) * | 2018-11-16 | 2019-03-08 | 中国航发西安动力控制科技有限公司 | It can be improved the heat treatment process of 50CrVA plunger spring fatigue strength |
| CN115612795A (en) * | 2022-11-02 | 2023-01-17 | 海安东洋弹簧有限公司 | 50CrVA material heat treatment quenching process and application thereof |
-
2008
- 2008-07-15 CN CN200810068827A patent/CN101629228A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103849742A (en) * | 2012-11-29 | 2014-06-11 | 中国航空工业标准件制造有限责任公司 | Heat treatment process for steel elastic part |
| CN109439856A (en) * | 2018-11-16 | 2019-03-08 | 中国航发西安动力控制科技有限公司 | It can be improved the heat treatment process of 50CrVA plunger spring fatigue strength |
| CN115612795A (en) * | 2022-11-02 | 2023-01-17 | 海安东洋弹簧有限公司 | 50CrVA material heat treatment quenching process and application thereof |
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Open date: 20100120 |