CN102230151A - Heat treatment process of metal workpiece - Google Patents
Heat treatment process of metal workpiece Download PDFInfo
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- CN102230151A CN102230151A CN2011102034371A CN201110203437A CN102230151A CN 102230151 A CN102230151 A CN 102230151A CN 2011102034371 A CN2011102034371 A CN 2011102034371A CN 201110203437 A CN201110203437 A CN 201110203437A CN 102230151 A CN102230151 A CN 102230151A
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Abstract
The invention provides a heat treatment process of a metal workpiece. The heat treatment process comprises the following steps: firstly preheating the workpiece to be treated in the presence of shielding gas; heating for carbonitriding; quenching; and tempering and cooling. The heat-treated workpiece has the advantages of high strength and good wear resistance; and a durability test and a main physiochemical performance test show that the workpiece meets technological requirements.
Description
Technical field
The present invention relates to a kind of metal works thermal treatment process, relate in particular to a kind of thermal treatment process that improves workpiece antifatigue spot corrosion wearing and tearing.
Background technology
The general work principle that 125 man styles straddle motorcycle engine is to be contractd by the mixed pressure of mixing air and fuel (normally gasoline) to light the back and forms blast in cylinder, and the drive crankshaft operation provides power, i.e. the process of conversion of heat into kinetic energy; Then bent axle by primary pinion power the different speed ratios of the different gears by main shaft/countershaft again, with the slow speed of revolution to high rotating speed with transmission of power output gear initiatively to the countershaft, and then, reach the purpose of motorcycle walking by the running of chain drive trailing wheel.Be exactly the vitals that transmits high rotating speed power as five grades of gears on master/countershaft gearing mechanism main shaft so, this gear is in the operational process of transferring power and change speed, existing rolling between the pair of meshing flank of tooth, slip is arranged again, and tooth root portion also will be pulsed or the effect of alternate flexural stress, and these stress mainly contain three kinds: frictional force, contact stress and stress in bending.
High rotating speed, superpower load, multiple stress state are on active service down owing to be everlasting, so gear very easily produces tired spot corrosion wearing and tearing, in this field, because the incidence of the engine abnormal noise that causes of this fault is than higher.So straddle in the car motorcycle engine check to comply with the national standard requirements after must be through engine pedestal durable in man style and just can be used as salable product and go on the market.Especially some 125 man style straddles car when exploitation, owing to have than general 125 man styles and straddle the characteristics that car power height (8.5KW), five grades of general 125 man styles of gear ratio straddle the width little (little 1mm) of five grades of wheel teeth of car, unit load on the gear and stress are very big like this, this just causes gear more to be easy to generate durable spot corrosion wearing and tearing, tired spot corrosion wear problems occurs so just occurred the durable back of engine pedestal on stream.
Summary of the invention
The purpose of this invention is to provide a kind of metal works thermal treatment process, by improve preheating, ooze by force, diffusion and quenching technology, thereby improve gear spot corrosion wearing and tearing.Problem to be solved by this invention is the deficiency that the prior art middle gear is prone to tired spot corrosion wearing and tearing.
Metal works thermal treatment process of the present invention, step comprises:
Step 1 is with preheating under 770 ± 5 ℃ of pending workpiece and the protection gas existence condition;
Step 2 is warming up to 870 ± 5 ℃ and carries out carbonitriding, and wherein, oozing the stage carbon-potential control by force is 1.15% ~ 1.25%, and the diffusion phase carbon-potential control is 1.05% ~ 1.15%; Be cooled to 830 ± 5 ℃ then and be incubated, holding stage finishes carbon-potential control 0.90% ~ 1.05%;
Step 3 is quenched under 120 ± 5 ℃ of conditions;
Step 4 is carried out tempering under 180 ± 10 ℃ of conditions, cooling.
In the above-mentioned thermal treatment process of the present invention, each flow process required time changes according to different depth of penetration, and the present invention is preferably the following time:
The above-mentioned thermal treatment process of the present invention, in the step 1, be 25 ± 5 minutes warm up time.
The above-mentioned thermal treatment process of the present invention, in the step 2, oozing the time in stage by force is 130 ± 5 minutes; The diffusion phase time is 45 ± 5 minutes; The holding stage time is 30 ± 5 minutes.
Wherein, be equal thermophase in preceding 30 ± 5 minutes that ooze the stage by force, back 95 ± 5 minutes for formally oozing the stage by force.
The above-mentioned thermal treatment process of the present invention, in the step 3, the time in stage of quenching is 30 ± 5 minutes.
The above-mentioned thermal treatment process of the present invention, in the step 4, tempering time is 180 ± 5 minutes.
According to a kind of preferred implementation of thermal treatment process of the present invention, in the step 2, nitrogenous source is provided by ammonia, and carbon source is provided by methyl alcohol and propane.
More preferably, described methyl alcohol fed in the preheating initial stage, stopped when holding stage finishes; Described ammonia fed in strong stage flushing beginning, stopped when being cooled to holding stage.
The above-mentioned thermal treatment process of the present invention, wherein, the methyl alcohol flow is 2 ~ 3.8L/min; And by the carbon potential in the propane adjusting heat treatment environment.
The contriver also finds, in the above-mentioned thermal treatment process of the present invention, the ammonia flow difference, workpiece anti-fatigue intensity is also different, the present invention is preferably being oozed the stage by force, and ammonia flow is 1.5 ~ 3L/min, in diffusion phase and diffusion back temperature-fall period flow is 1.5 ~ 2.5L/min, obstructed ammonia of all the other stages.
The above-mentioned thermal treatment process of the present invention in the step 3, is carried out drop oil after quenching is finished, and the time is 20 ± 5 minutes, and temperature can be normal temperature or room temperature.
Metal works thermal treatment process of the present invention, 500 ℃ of preoxidation processes in the existing thermal treatment process technology have been cancelled, and increased the pre-heating stage under the protective atmosphere, and ooze by controlling by force, the carbon potential of diffusion and holding stage, thereby make the five grades of strengths of gear teeth of main shaft after the processing higher, through durable test, no spot corrosion situation occurs; Illustrate that heat treating method of the present invention has well solved the durable spot corrosion wear problems of five grades of gears of main shaft.Thermal treatment process of the present invention can also be used for the thermal treatment of workpiece such as other metal gear simultaneously, to improve intensity.
Description of drawings
Fig. 1 is heat treatment cycle curve figure of the present invention.
Embodiment
Metal works thermal treatment process of the present invention, step comprises:
Step 1 is with preheating under 770 ± 5 ℃ of pending workpiece and the protection gas existence condition;
Step 2 is warming up to 870 ± 5 ℃ and carries out carbonitriding, and wherein, oozing the stage carbon-potential control by force is 1.20 ± 0.05%, and the diffusion phase carbon-potential control is 1.10 ± 0.05%; Be cooled to 830 ± 5 ℃ then and be incubated, the holding stage carbon-potential control is 0.90% ~ 1.05%;
Step 3,120 ± 5 ℃ of quenchings;
Step 4,180 ± 10 ℃ of tempering, cooling.
Metal works thermal treatment process equipment used of the present invention can adopt the known equipment of prior art, can be multipurpose furnaces such as business-like well formula multipurpose furnace, controlled atmosphere sealed-box type multipurpose furnace, as rich eastern multipurpose furnace.
Below by specific embodiment metal works thermal treatment process of the present invention is described in detail and describes, so that better understand the present invention, but following embodiment does not limit the scope of the invention.
Embodiment 1
Under the protective atmosphere, gear is carried out preheating at 770 ± 5 ℃, be 25 ± 5 minutes warm up time, feeds methyl alcohol in the time of preheating, and the methyl alcohol flow is 3.8L/min.
With utmost dispatch temperature is risen to 870 ± 5 ℃ after the preheating, feed ammonia under this temperature, ammonia flow is 2.5L/min.Feed methane carbon potential is adjusted to 1.23%, carry out oozing the stage by force of carbonitriding.
Enter diffusion phase after 135 minutes, nitrogen flow is adjusted to 1.5L/min, and carbon potential is adjusted to 1.07%.
After 50 minutes, as early as possible with near 830 ± 5 ℃ of temperature, and be incubated under this temperature, stop the feeding of ammonia simultaneously, carbon potential is adjusted to 0.95%.
Be incubated 35 minutes, oil quenchinng, quenching temperature is 120 ± 5 ℃, the time is 30 minutes.
Quenching finishes, and carries out tempering process, and tempering temperature is 180 ± 10 ℃, and the time is 180 minutes; Described thermal treatment process is finished in the cooling back.
Embodiment 2
Under the protective atmosphere, gear is carried out preheating at 770 ± 5 ℃, be 25 minutes warm up time, feeds methyl alcohol in the time of preheating, and the methyl alcohol flow is 3.8L/min.
With utmost dispatch temperature is risen to 870 ± 5 ℃ after the preheating, feed ammonia under this temperature, ammonia flow is 2.5L/min.Feed methane carbon potential is adjusted to 1.18%, carry out oozing the stage by force of carbonitriding.
Enter diffusion phase after 125 minutes, nitrogen flow is adjusted to 1.5L/min, and carbon potential is adjusted to 1.08%.
After 45 minutes, as early as possible with near 830 ± 5 ℃ of temperature, and be incubated under this temperature, stop the feeding of ammonia simultaneously, carbon potential is adjusted to 1.02%.
Be incubated 45 minutes, oil quenchinng, quenching temperature is 120 ± 5 ℃, the time is 30 minutes.
Quenching finishes, and carries out tempering process, and tempering temperature is 180 ± 10 ℃, and the time is 180 minutes; Described thermal treatment process is finished in the cooling back.
Embodiment 3
Under the protective atmosphere, gear is carried out preheating at 770 ± 5 ℃, be 25 minutes warm up time, feeds methyl alcohol in the time of preheating, and the methyl alcohol flow is 3.8L/min.
With utmost dispatch temperature is risen to 870 ± 5 ℃ after the preheating, make temperature-stable through the end time (as 35min), feed ammonia under this temperature, ammonia flow is 2.5L/min.Feed methane carbon potential is adjusted to 1.20%, carry out oozing the stage by force of carbonitriding.
Enter diffusion phase after 130 minutes, nitrogen flow is adjusted to 1.5L/min, and carbon potential is adjusted to 1.10%.
After 45 minutes, as early as possible with near 830 ± 5 ℃ of temperature, and be incubated under this temperature, stop the feeding of ammonia simultaneously, carbon potential is adjusted to 0.98%.
Be incubated 45 minutes, oil quenchinng, quenching temperature is 120 ± 5 ℃, the time is 30 minutes.
Quenching finishes, and carries out tempering process, and tempering temperature is 180 ± 10 ℃, and the time is 180 minutes; Described thermal treatment process is finished in the cooling back.
The heat treated gear of the above embodiment of the present invention carries out the endurance quality test, and test condition is: fourth gear 140H+ third gear 60H, 7500r/min, acknowledging time: on 03 03rd, 2011 on 03 14th, 1 2011.Test result shows that the spot corrosion situation does not appear in the heat treated gear of the above embodiment of the present invention.
The physics and chemistry detected result shows that the heat treated gear of the above embodiment of the present invention meets processing requirement, and concrete detected result sees Table 1.
Table 1, embodiment of the invention thermal treatment gear metallographic examination result
More than specific embodiments of the invention are described in detail, but it is just as example, the present invention is not restricted to specific embodiment described above.To those skilled in the art, any equivalent modifications that the present invention is carried out and substituting also all among category of the present invention.Therefore, not breaking away from impartial conversion and the modification of being done under the spirit and scope of the present invention, all should contain within the scope of the invention.
Claims (9)
1. metal works thermal treatment process is characterized in that step comprises:
Step 1 is with preheating under 770 ± 5 ℃ of pending workpiece and the protection gas existence condition;
Step 2 is warming up to 870 ± 5 ℃ and carries out carbonitriding, and wherein, oozing the stage carbon-potential control by force is 1.20 ± 0.05%, and the diffusion phase carbon-potential control is 1.10 ± 0.05%; Be cooled to 830 ± 5 ℃ then and be incubated, the holding stage carbon-potential control is 0.90% ~ 1.05%;
Step 3 is quenched under 120 ± 5 ℃ of conditions;
Step 4 is carried out tempering under 180 ± 10 ℃ of conditions, cooling.
2. thermal treatment process according to claim 1 is characterized in that, be 25 ± 5 minutes warm up time described in the step 1.
3. thermal treatment process according to claim 1 is characterized in that, in the step 2, described to ooze the time in stage by force be 130 ± 5 minutes; The described diffusion phase time is 45 ± 5 minutes; The described holding stage time is 30 ± 5 minutes.
4. thermal treatment process according to claim 1 is characterized in that, in the described step 3, the time in stage of quenching is 30 ± 5 minutes.
5. thermal treatment process according to claim 1 is characterized in that, in the described step 4, tempering time is 180 ± 5 minutes.
6. thermal treatment process according to claim 1 is characterized in that, in the described carbonitriding technology of step 2, nitrogenous source is an ammonia, and carbon source is methyl alcohol and propane.
7. thermal treatment process according to claim 6 is characterized in that, described methyl alcohol fed in the preheating initial stage, stopped when holding stage finishes; Described ammonia feeds when carbonitriding begins, and stops when being cooled to holding stage.
8. according to claim 6 or 7 described thermal treatment process, it is characterized in that oozing the stage by force, ammonia flow is 1.5 ~ 3L/min, is 1.5 ~ 2.5L/min in diffusion phase and diffusion back temperature-fall period flow, obstructed ammonia of all the other stages.
9. according to claim 6 or 7 described thermal treatment process, it is characterized in that the methyl alcohol flow is 2 ~ 3.8L/min; And by the carbon potential in the propane adjusting heat treatment environment.
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534465A (en) * | 2012-02-02 | 2012-07-04 | 山东常林机械集团股份有限公司 | Heat treatment process for surface hardening and carbonitriding of hydraulic parts |
| 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 |
| CN104213070A (en) * | 2014-07-30 | 2014-12-17 | 珠海市钧兴机电有限公司 | Control process for carburized layer of sewing machine gear |
| CN104789923A (en) * | 2014-01-20 | 2015-07-22 | 广东柳菱宏通实业有限公司 | Application method of rare earth in pre-oxidation and soft nitriding technology |
| CN104831293A (en) * | 2015-05-26 | 2015-08-12 | 重庆银雁科技有限公司 | Technology for carburizing and quenching screws |
| CN104975298A (en) * | 2015-07-10 | 2015-10-14 | 重庆银雁科技有限公司 | Multi-purpose furnace quenching process for bevel gears |
| CN105200201A (en) * | 2015-11-12 | 2015-12-30 | 佳兴紧固件工业（苏州）有限公司 | Method for carbonitriding heat treatment of screws |
| CN106435462A (en) * | 2016-07-01 | 2017-02-22 | 兴化东华齿轮有限公司 | Energy-saving composite type thermal treatment process |
| CN107201494A (en) * | 2017-06-20 | 2017-09-26 | 合肥博创机械制造有限公司 | A kind of alloy carburizing steel gear heat treatment technique |
| CN109182958A (en) * | 2018-11-22 | 2019-01-11 | 福泉市发隆钢构有限公司 | A kind of steel structure surface processing method |
| CN109266999A (en) * | 2018-11-23 | 2019-01-25 | 福泉市发隆钢构有限公司 | A kind of steel structure surface processing method |
| CN109487203A (en) * | 2018-12-31 | 2019-03-19 | 安徽银龙泵阀股份有限公司 | Valve plate surface carbo-nitriding processing method |
| CN109504935A (en) * | 2018-12-18 | 2019-03-22 | 上海嘉恒热处理有限公司 | A kind of thin sheet of metal part heat treatment process |
| CN109778109A (en) * | 2019-03-26 | 2019-05-21 | 成都天马精密机械有限公司 | A method of it is off quality to solve carbo-nitriding |
| CN110241378A (en) * | 2012-08-21 | 2019-09-17 | Skf公司 | The method and steel member of heat- treated steel component |
| CN110541139A (en) * | 2019-10-18 | 2019-12-06 | 洪新阳 | carburizing and quenching method and carburizing and quenching equipment for internal spline of half axle gear |
| CN114032493A (en) * | 2021-09-28 | 2022-02-11 | 上海热处理厂有限公司 | Method for modifying high hardness of surface of low-carbon alloy steel |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534465A (en) * | 2012-02-02 | 2012-07-04 | 山东常林机械集团股份有限公司 | Heat treatment process for surface hardening and carbonitriding of hydraulic parts |
| CN102534465B (en) * | 2012-02-02 | 2013-07-17 | 山东常林机械集团股份有限公司 | Heat treatment process for surface hardening and carbonitriding of hydraulic parts |
| CN110241378A (en) * | 2012-08-21 | 2019-09-17 | Skf公司 | The method and steel member of heat- treated steel component |
| CN104789923A (en) * | 2014-01-20 | 2015-07-22 | 广东柳菱宏通实业有限公司 | Application method of rare earth in pre-oxidation and soft nitriding technology |
| 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 |
| CN104213070A (en) * | 2014-07-30 | 2014-12-17 | 珠海市钧兴机电有限公司 | Control process for carburized layer of sewing machine gear |
| CN104213070B (en) * | 2014-07-30 | 2018-12-11 | 珠海市钧兴机电有限公司 | Sewing machine gear wheel carburization layer control technique |
| CN104831293B (en) * | 2015-05-26 | 2017-06-20 | 重庆银雁科技有限公司 | Screw carburizing quenching process |
| CN104831293A (en) * | 2015-05-26 | 2015-08-12 | 重庆银雁科技有限公司 | Technology for carburizing and quenching screws |
| CN104975298A (en) * | 2015-07-10 | 2015-10-14 | 重庆银雁科技有限公司 | Multi-purpose furnace quenching process for bevel gears |
| CN105200201B (en) * | 2015-11-12 | 2017-03-15 | 佳兴紧固件工业（苏州）有限公司 | A kind of carbo-nitriding heat-treating methods for screw |
| CN105200201A (en) * | 2015-11-12 | 2015-12-30 | 佳兴紧固件工业（苏州）有限公司 | Method for carbonitriding heat treatment of screws |
| CN106435462A (en) * | 2016-07-01 | 2017-02-22 | 兴化东华齿轮有限公司 | Energy-saving composite type thermal treatment process |
| CN107201494A (en) * | 2017-06-20 | 2017-09-26 | 合肥博创机械制造有限公司 | A kind of alloy carburizing steel gear heat treatment technique |
| CN109182958A (en) * | 2018-11-22 | 2019-01-11 | 福泉市发隆钢构有限公司 | A kind of steel structure surface processing method |
| CN109266999A (en) * | 2018-11-23 | 2019-01-25 | 福泉市发隆钢构有限公司 | A kind of steel structure surface processing method |
| CN109504935A (en) * | 2018-12-18 | 2019-03-22 | 上海嘉恒热处理有限公司 | A kind of thin sheet of metal part heat treatment process |
| CN109487203A (en) * | 2018-12-31 | 2019-03-19 | 安徽银龙泵阀股份有限公司 | Valve plate surface carbo-nitriding processing method |
| CN109778109A (en) * | 2019-03-26 | 2019-05-21 | 成都天马精密机械有限公司 | A method of it is off quality to solve carbo-nitriding |
| CN109778109B (en) * | 2019-03-26 | 2020-12-08 | 成都天马精密机械有限公司 | Method for solving problem of unqualified carbonitriding quality |
| CN110541139A (en) * | 2019-10-18 | 2019-12-06 | 洪新阳 | carburizing and quenching method and carburizing and quenching equipment for internal spline of half axle gear |
| CN114032493A (en) * | 2021-09-28 | 2022-02-11 | 上海热处理厂有限公司 | Method for modifying high hardness of surface of low-carbon alloy steel |
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Effective date of registration: 20190429 Address after: No. 36, East Guangzhou Road, 215000 Taicang High-tech Industrial Development Zone, Jiangsu Province Patentee after: New Dazhou Honda Motorcycle (Suzhou) Co., Ltd. Address before: 201708 No. 188 Jiasong Middle Road, Huaxin Town, Qingpu District, Shanghai Patentee before: Sundiro Honda Motorcycle Co., Ltd. |