CN105463366B - The method for carburizing of automobile gearbox park pawl - Google Patents
The method for carburizing of automobile gearbox park pawl Download PDFInfo
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- CN105463366B CN105463366B CN201410448515.8A CN201410448515A CN105463366B CN 105463366 B CN105463366 B CN 105463366B CN 201410448515 A CN201410448515 A CN 201410448515A CN 105463366 B CN105463366 B CN 105463366B
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- carburizing
- park pawl
- automobile gearbox
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Abstract
The present invention provides a kind of method for carburizing of automobile gearbox park pawl, comprises the following steps：1) workpiece is made under 910 DEG C of temperature T=890,0.6%C carbon potential environment, samming is handled 10 minutes；2) carbon potential is risen to 1.05%C；3) under 1.05%C carbon potential environment, strong carburizing 150 210 minutes is carried out to workpiece；4) carbon drop gesture is to 0.75%C；5) under the carbon potential environment of 0.75%C, carburizing is diffused to workpiece 90 minutes；6) under the carbon potential environment of 0.75%C, workpiece is cooled to 840 DEG C；7) 840 DEG C of constant temperature, 0.75%C carbon potential environment under, to workpiece keep the temperature 60 minutes.The method for carburizing of the automobile gearbox park pawl of the present invention takes the carburizing and quenching process of automobile gearbox park pawl, and short, heat treatment efficiency is high；Also make that the surface quality of automobile gearbox park pawl is good, intensity is high, wear-resisting property is good.
Description
Technical field
The present invention relates to the technical field of heat treatment of steel workpiece, more particularly to a kind of automobile gearbox park pawl
Method for carburizing.
Background technology
As shown in Figure 1, automobile gearbox park pawl 1, is the important part for protecting automotive safety to park, when automobile stagnation of movement
When, the part is locked the transmission parts of automobile by operation handle, reliably parked so as to fulfill automotive safety.Therefore, vapour
Car gearbox park pawl 1 should have enough intensity and wear-resisting property, and consider from financial cost, automobile gearbox parking spine
After machine-shaping, it is resistance to improve intensity and surface often using mild steel as raw material by carburizing and quenching technical for pawl 1
Grind performance.
According to the situation of actual use, the case hardness of automobile gearbox park pawl 1 should be preferably maintained at 78.5-
81HRA, core hardness are preferably kept in 25-45HRC, and carburized (case) depth is preferably controlled in 0.7mm-1.2mm；Surface metallographic structure
Preferably 1-3 grade of martensite, 1-3 grade of retained austenite.
The carburization process of the automobile gearbox park pawl of the prior art, species is more, temperature, carbon potential, the value area of time
Between it is all very big, cause the intensity of automobile gearbox park pawl, wear-resisting property after carburizing and quenching technical very different, by oozing
The surface quality of the automobile gearbox park pawl of carbon quenching does not often reach requirement, for example carburized layer is too thin or too thick, deformation
Amount is too big, and case hardness is too high or too low, and surface metallographic structure is poor.Also some carburization process make automobile gearbox parking spine
The surface quality of pawl is good, but carburization process take it is too long so that the heat treatment efficiency of automobile gearbox park pawl is too low, raw
It is low to produce efficiency.
The content of the invention
In view of the foregoing deficiencies of prior art, the technical problem to be solved in the present invention is to provide a kind of heat treatment effect
The method for carburizing for the automobile gearbox park pawl that rate is high, surface quality is high, to overcome the drawbacks described above of the prior art.
In order to solve the above technical problem, the present invention provides a kind of method for carburizing of automobile gearbox park pawl, including
Following steps：
1) workpiece is carried out samming processing in the case where temperature is the carbon potential environment of T, 0.6%C, kept for 10 minutes；Wherein, T=
890-910℃；
2) keep temperature-resistant, rise carbon potential to 1.05%C；
3) under the carbon potential environment of 1.05%C, workpiece is carried out carburizing 150-210 minutes strong；
4) temperature-resistant, carbon drop gesture to 0.75%C is kept；
5) under the carbon potential environment of 0.75%C, carburizing is diffused to workpiece 90 minutes；
6) under the carbon potential environment of 0.75%C, workpiece is cooled to 840 DEG C；
7) under the carbon potential environment of the constant temperature at 840 DEG C, 0.75%C, 60 minutes are kept the temperature to workpiece.
Preferably, step 1)~5) in T=900 DEG C of temperature, time of strong carburizing is carried out in step 3) to workpiece
For 180 minutes.
Alternatively, step 1)~5) in T=890 DEG C of temperature, time of strong carburizing is carried out in step 3) to workpiece
For 210 minutes.
Alternatively, step 1)~5) in T=910 DEG C of temperature, time of strong carburizing is carried out in step 3) to workpiece
For 150 minutes.
As described above, the method for carburizing of the automobile gearbox park pawl of the present invention, has the advantages that：
Make automobile gearbox park pawl carburizing and quenching process take it is short so that heat treatment efficiency is high；Make automobile variable speed
After carburizing and quenching, carburized (case) depth can be maintained between 0.65mm -1.03mm case park pawl, surface metallographic structure
Martensite and retained austenite can be maintained at level-one between three-level, deflection is in below 0.12mm, so that automobile
The surface quality of gearbox park pawl is good, intensity is high, and wear-resisting property is good.
Brief description of the drawings
Fig. 1 is shown as the schematic front view of automobile gearbox park pawl.
Component label instructions
1 automobile gearbox park pawl
Embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book understands other advantages and effect of the present invention easily.
Please refer to Fig.1.It should be clear that structure, ratio, size depicted in this specification institute accompanying drawings etc., only coordinating
The revealed content of specification, so that those skilled in the art understands and reads, it is enforceable to be not limited to the present invention
Qualifications, therefore do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size,
Do not influence under the effect of present invention can be generated and the purpose that can reach, should all still fall in disclosed technology contents
Obtain in the range of covering.Meanwhile cited such as " on ", " under ", "left", "right", " centre " and " one " in this specification
Term, be merely convenient to understanding for narration, and be not used to limit the enforceable scope of the present invention, the change of its relativeness or
Adjustment, in the case where changing technology contents without essence, when being also considered as the enforceable category of the present invention.
In view of the carburizing quenching process of the automobile gearbox park pawl of the prior art, species is more, temperature, carbon potential, time
Interval it is all very big, cause the intensity of automobile gearbox park pawl, wear-resisting property after carburizing quenching process very different,
Surface quality by the automobile gearbox park pawl of carburizing and quenching does not often reach requirement, for example carburized layer is too thin or too
Thickness, deflection is too big, and case hardness is too high or too low, and surface metallographic structure is poor；Also some carburizing quenching process make automobile
The surface quality of gearbox park pawl is good, but carburizing quenching process take it is too long so that automobile gearbox park pawl
Heat treatment efficiency is too low, low production efficiency.The present inventor designs the vapour that a kind of heat treatment efficiency is high, surface quality is high
The method for carburizing of the automobile gearbox park pawl of the method for carburizing of car gearbox park pawl.
It will be carried out below by specific embodiment come the method for carburizing of the automobile gearbox park pawl to the present invention detailed
Explanation.
A kind of method for carburizing of automobile gearbox park pawl, comprises the following steps：
1) workpiece is carried out samming processing in the case where temperature is the carbon potential environment of T, 0.6%C, kept for 10 minutes；Wherein, T=
890-910℃；
2) keep temperature-resistant, rise carbon potential to 1.05%C；
3) under the carbon potential environment of 1.05%C, workpiece is carried out carburizing 150-210 minutes strong；
4) temperature-resistant, carbon drop gesture to 0.75%C is kept；
5) under the carbon potential environment of 0.75%C, carburizing is diffused to workpiece 90 minutes；
6) under the carbon potential environment of 0.75%C, workpiece is cooled to 840 DEG C；
7) under the carbon potential environment of the constant temperature at 840 DEG C, 0.75%C, 60 minutes are kept the temperature to workpiece.
Embodiment one
T=890 DEG C is taken, then the step of method for carburizing of automobile gearbox park pawl of the invention is as follows：
First, the temperature of carburizer is adjusted to 890 DEG C, carbon potential is adjusted to 0.6%C；By the automobile gearbox of machine-shaping
Park pawl 1 is put into progress samming processing in carburizer (referring to Fig. 1), is kept for 10 minutes；
2nd, make the automobile gearbox park pawl 1 in the environment of 890 DEG C of constant temperature, a liter carbon potential behaviour is carried out to carburizer
Make, in 20 minutes, by carbon potential stabilization in 1.05%C；
3rd, in the environment of 890 DEG C of constant temperature, carbon potential 1.05%C, automobile gearbox park pawl the last 1 is oozed
Carbon 210 minutes；
4th, in the environment of 890 DEG C of constant temperature, carbon drop gesture operation is carried out to carburizer, it is in 10 minutes, carbon potential is steady
It is scheduled on 0.75%C；
5th, in the environment of 890 DEG C of constant temperature, carbon potential 0.75%C, the automobile gearbox park pawl 1 is diffused
Carburizing 90 minutes；
6th, in the environment of carbon potential 0.75%C, the carburizer is controlled to carry out the automobile gearbox park pawl 1
Cooling, making the automobile gearbox park pawl 1, temperature drops to 840 DEG C in 10 minutes；
7th, under the carbon potential environment of the constant temperature at 840 DEG C, 0.75%C, to the automobile gearbox park pawl 1 insulation 60
Minute, the carburizing process of the automobile gearbox park pawl 1 terminates.
After carburizing process terminates, the automobile gearbox park pawl 1 is quenched according to traditional process for quenching, it
Afterwards, the surface quality of the automobile gearbox park pawl 1 is detected, it is 0.65mm -0.74mm to measure case depth, metallographic
The martensite of tissue, retained austenite grade be level-one to two level, deflection is between 0.04mm -0.06mm.
Embodiment two
T=900 DEG C is taken, then the step of method for carburizing of automobile gearbox park pawl of the invention is as follows：
First, the temperature of carburizer is adjusted to 900 DEG C, carbon potential is adjusted to 0.6%C；By the automobile gearbox of machine-shaping
Park pawl 1 is put into progress samming processing in carburizer (referring to Fig. 1), is kept for 10 minutes；
2nd, make the automobile gearbox park pawl 1 in the environment of 900 DEG C of constant temperature, a liter carbon potential behaviour is carried out to carburizer
Make, in 20 minutes, by carbon potential stabilization in 1.05%C；
3rd, in the environment of 900 DEG C of constant temperature, carbon potential 1.05%C, automobile gearbox park pawl the last 1 is oozed
Carbon 180 minutes；
4th, in the environment of 900 DEG C of constant temperature, carbon drop gesture operation is carried out to carburizer, it is in 10 minutes, carbon potential is steady
It is scheduled on 0.75%C；
5th, in the environment of 900 DEG C of constant temperature, carbon potential 0.75%C, the automobile gearbox park pawl 1 is diffused
Carburizing 90 minutes；
6th, in the environment of carbon potential 0.75%C, the carburizer is controlled to carry out the automobile gearbox park pawl 1
Cooling, making the automobile gearbox park pawl 1, temperature drops to 840 DEG C in 10 minutes；
7th, under the carbon potential environment of the constant temperature at 840 DEG C, 0.75%C, to the automobile gearbox park pawl 1 insulation 60
Minute, the carburizing process of the automobile gearbox park pawl 1 terminates.
After carburizing process terminates, the automobile gearbox park pawl 1 is quenched according to traditional process for quenching, it
Afterwards, the surface quality of the automobile gearbox park pawl 1 is detected, it is 0.8mm -0.92mm to measure case depth, metallographic
The martensite of tissue, retained austenite grade be level-one to two level, deflection is between 0.04mm -0.07mm.
Embodiment three
T=910 DEG C is taken, then the step of method for carburizing of automobile gearbox park pawl of the invention is as follows：
First, the temperature of carburizer is adjusted to 910 DEG C, carbon potential is adjusted to 0.6%C；By the automobile gearbox of machine-shaping
Park pawl 1 is put into progress samming processing in carburizer (referring to Fig. 1), is kept for 10 minutes；
2nd, make the automobile gearbox park pawl 1 in the environment of 910 DEG C of constant temperature, a liter carbon potential behaviour is carried out to carburizer
Make, in 20 minutes, by carbon potential stabilization in 1.05%C；
3rd, in the environment of 910 DEG C of constant temperature, carbon potential 1.05%C, automobile gearbox park pawl the last 1 is oozed
Carbon 150 minutes；
4th, in the environment of 910 DEG C of constant temperature, carbon drop gesture operation is carried out to carburizer, it is in 10 minutes, carbon potential is steady
It is scheduled on 0.75%C；
5th, in the environment of 910 DEG C of constant temperature, carbon potential 0.75%C, the automobile gearbox park pawl 1 is diffused
Carburizing 90 minutes；
6th, in the environment of carbon potential 0.75%C, the carburizer is controlled to carry out the automobile gearbox park pawl 1
Cooling, making the automobile gearbox park pawl 1, temperature drops to 840 DEG C in 25 minutes；
7th, under the carbon potential environment of the constant temperature at 840 DEG C, 0.75%C, to the automobile gearbox park pawl 1 insulation 60
Minute, the carburizing process of the automobile gearbox park pawl 1 terminates.
After carburizing process terminates, the automobile gearbox park pawl 1 is quenched according to traditional process for quenching, it
Afterwards, the surface quality of the automobile gearbox park pawl 1 is detected, it is 0.9mm -1.03mm to measure case depth, metallographic
The martensite of tissue, retained austenite grade be two level to three-level, deflection is between 0.09mm -0.12mm.
Embodiments herein one, embodiment two, embodiment three are contrasted, it can be seen that the step of embodiment one
Three, it is most long the time required to strong carburizing is carried out to the automobile gearbox park pawl 1, so that time-consuming most long；The step of embodiment three
Rapid three, it is most short the time required to strong carburizing is carried out to the automobile gearbox park pawl 1, but the temperature fall time of its step 6 is than real
15 minutes will be about (the automobile gearbox park pawl 1 drops to 900 DEG C by 910 DEG C by applying the temperature fall time of two step 6 of example
It is about 15 minutes time-consuming), and the temperature of carburizer is adjusted to 910 DEG C in the step of embodiment three one, relative to embodiment two
The step of one in the temperature of carburizer is adjusted to 900 DEG C, take it is also about 10 minutes more so that embodiment three is relative to implementation
Example two, it is time-consuming only to shorten about 5 minutes.Again from the point of view of surface quality, embodiment one formed carburized (case) depth for 0.65mm-
0.74mm, although being substantially conformed to the optimal carburized (case) depth 0.7mm -1.2mm of automobile gearbox park pawl 1, it is apparent that deep
Angle value is less than normal；The martensite for the metallographic structure that embodiment three is formed, retained austenite grade are that two level is to three-level, deflection
0.09mm–0.12mm；And the carburized (case) depth that embodiment two is formed is 0.8mm -0.92mm, martensite, the remnants of metallographic structure
Austenitic grade be level-one to two level, deflection is between 0.04mm -0.07mm；It will be apparent that the surface that embodiment two is formed
Quality meets the most with the optimum surface quality required by automobile gearbox park pawl 1, its metallographic structure and deflection are all excellent
In embodiment three, its carburized (case) depth is better than embodiment one.Reflect, embodiment two has taken into account the efficiency and heat treatment matter of heat treatment
Amount, is the most preferred embodiment of the application.
The method for carburizing of the automobile gearbox park pawl of the application is not only applicable to oozing for automobile gearbox park pawl
Carbon processing, applies also for the Carburization Treatment of other various steel workpiece, being equally reached makes the intensity of steel workpiece improve, is resistance to
Grind the effect that performance improves.
In conclusion the method for carburizing of the automobile gearbox park pawl of the present invention, makes automobile gearbox park pawl
Carburizing and quenching process take it is short so that heat treatment efficiency is high；Make automobile gearbox park pawl in the intensity after carburizing and quenching
Height, wear-resisting property are good.So the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (1)
1. a kind of method for carburizing of automobile gearbox park pawl, it is characterised in that comprise the following steps：
1）Workpiece is carried out samming processing in the case where temperature is the carbon potential environment of T, 0.6%C, kept for 10 minutes；Wherein, T=890-
910℃；
2）Keep temperature-resistant, in 20 minutes, rise carbon potential to 1.05%C；
3）Under the carbon potential environment of 1.05%C, workpiece is carried out carburizing 150-210 minutes strong；
4）Keep temperature-resistant, in 10 minutes, carbon drop gesture to 0.75%C；
5）Under the carbon potential environment of 0.75%C, carburizing is diffused to workpiece 90 minutes；
6）Under the carbon potential environment of 0.75%C, workpiece is cooled to 840 DEG C；
7）Under the carbon potential environment of constant temperature, 0.75%C at 840 DEG C, 60 minutes are kept the temperature to workpiece.
The step 1）~5）In temperature T=900 DEG C, step 3）In to carry out time of strong carburizing to workpiece be 180 minutes.
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| CN201410448515.8A CN105463366B (en) | 2014-09-04 | 2014-09-04 | The method for carburizing of automobile gearbox park pawl |
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| CN201410448515.8A CN105463366B (en) | 2014-09-04 | 2014-09-04 | The method for carburizing of automobile gearbox park pawl |
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| CN105463366B true CN105463366B (en) | 2018-05-15 |
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| CN109234666A (en) * | 2018-10-29 | 2019-01-18 | 汉德车桥(株洲)齿轮有限公司 | A kind of rare-earth carburizer and preparation method thereof, the passive roller gear of commercial axle master and its heat-treating methods |
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| CN101565809A (en) * | 2009-06-09 | 2009-10-28 | 石家庄金刚内燃机零部件集团有限公司 | Well type air seep carbon stove and improvement of process thereof |
| CN102703909A (en) * | 2012-05-24 | 2012-10-03 | 浙江吉利汽车研究院有限公司杭州分公司 | Combined carburizing and quenching process for improving gear performance |
| CN103993154A (en) * | 2014-06-09 | 2014-08-20 | 江西航宇热处理有限公司 | Thermal treatment method of alloy steel gear |
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2014
- 2014-09-04 CN CN201410448515.8A patent/CN105463366B/en active Active
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| CN101565809A (en) * | 2009-06-09 | 2009-10-28 | 石家庄金刚内燃机零部件集团有限公司 | Well type air seep carbon stove and improvement of process thereof |
| CN102703909A (en) * | 2012-05-24 | 2012-10-03 | 浙江吉利汽车研究院有限公司杭州分公司 | Combined carburizing and quenching process for improving gear performance |
| CN103993154A (en) * | 2014-06-09 | 2014-08-20 | 江西航宇热处理有限公司 | Thermal treatment method of alloy steel gear |
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