CN101058887A - Heat treatment process for automobile gear shifting box synchronizer gear sheath - Google Patents
Heat treatment process for automobile gear shifting box synchronizer gear sheath Download PDFInfo
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- CN101058887A CN101058887A CN 200710023417 CN200710023417A CN101058887A CN 101058887 A CN101058887 A CN 101058887A CN 200710023417 CN200710023417 CN 200710023417 CN 200710023417 A CN200710023417 A CN 200710023417A CN 101058887 A CN101058887 A CN 101058887A
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Abstract
The invention discloses a heat disposing technique of gear coat of automobile gear box synchronizer, which comprises the following steps: copenetrating carbon and nitrogen at 780-850 deg. c; quenching; cleaning; annealing; testing; setting the carbon potential at 0. 50-1. 0%, nitrogen adding quantity at 5-12m3/h, carbinon adding quantity at 4-7L/h, propane adding quantity at 0. 5-0. 9m3/h and ammonia gas adding quantity at 0-30L/h.
Description
Technical field
The present invention relates to a kind of thermal treatment process, specifically heat treatment process for automobile gear shifting box synchronizer gear sheath.
Background technology
Synchronizer gear sleeve is extensive use of in the mechanical gear shift formula wheel box of automobile, and its main effect is to make driver's shift control easy to be smooth and easy, and the variator use properties is increased substantially.Because automobile gear shifting box synchronizer gear sheath is very high to the mechanical property and the requirement on machining accuracy of material, it is extremely important that its thermal treatment quality just seems.In the prior art, automobile gear shifting box synchronizer gear sheath adopts low alloy steel mostly after carburizing or carbonitriding quenches, and carries out the thermal treatment process of low-temperaturetempering again.Its main treatment production process is carried out in different ways because of working condition is different, employing multipurpose furnace that has or vacuum oven carry out direct quenching behind the carburizing or carbonitriding, the subject matter that this technology exists is, thermal treatment after strain amount is big, and the part quality of production is not high.At present advanced heat treatment process for automobile gear shifting box synchronizer gear sheath is for pressing the thermal treatment process of quenching, and the main production process of this technology is: carbonitriding, press quench, cleaning, tempering, detection.Through quench automobile gear shifting box synchronizer gear sheath after the thermal treatment of this pressure, metallographic structure is good, and intensity height, wear resistance are good, and dimensional uniformity is good, is out of shape very little.
Because existing this automobile gear shifting box synchronizer gear sheath is pressed the whole technological process of thermal treatment process of quenching to be controlled automatically by computer and finished, it requires very high to the working service of equipment.Characteristic according to this technology is used for seeing with making, in specific implementation process, in equipment, set fix a breakdown the time be limited to 30min, the any fault that promptly requires equipment to take place all needs to get rid of within 30min, as surpassing 30min, press the quality of quenching stove inter-sync device tooth cover, will to produce hardened-depth overproof or metallographic structure is overproof because of overtime carburizing, and be subjected to seriously influencing, even can produce whole stove part and scrap.And in actual production process, 30min often can't finish clearing of a fault in the time limit, and it is long that product hinders servicing time for some reason, causes quality product overproof, causes whole stove product rejection sometimes.Because when equipment failure, part often can't be come out of the stove in the stove, so under the prerequisite that guarantees device security, can only be by carburizing process parameters adjustment being reached the servicing time that prolongation equipment may carry out.
Summary of the invention
Thereby the objective of the invention is to propose a kind ofly can effectively slow down the servicing time that the carbonitriding process prolongation equipment of part in converter may carry out, and reduces the heat treatment process for automobile gear shifting box synchronizer gear sheath of product disqualification rate and scrap rate significantly.
Purpose of the present invention can be achieved through the following technical solutions:
Heat treatment process for automobile gear shifting box synchronizer gear sheath, comprise step: carbonitriding, press quench, cleaning, tempering, detection, when device fails, in the carbonitriding step, carburizing temperature is adjusted into 780～850 ℃, carbon potential (concentration of the interior activated carbon of stove in the cementation process) is 0.50～1.0%, and the nitrogen add-on is 5～12m
3/ h, the methyl alcohol add-on is 4～7L/h, the propane add-on is 0.5～0.9m
3/ h, the ammonia add-on is 0～30L/h.
Purpose of the present invention can also further realize by following technical measures:
Aforesaid heat treatment process for automobile gear shifting box synchronizer gear sheath, in the wherein said carbonitriding step, carburizing temperature is 845 ± 5 ℃, and carbon potential is 0.95 ± 0.05%, and the nitrogen add-on is 5～6m
3/ h, the methyl alcohol add-on is 5～7L/h, the propane add-on is 0.8～0.9m
3/ h, the ammonia add-on is 25～30L/h.
Aforesaid heat treatment process for automobile gear shifting box synchronizer gear sheath, in the wherein said carbonitriding step, carburizing temperature is 800 ± 5 ℃, and carbon potential is 0.55 ± 0.05%, and the nitrogen add-on is 9～10m
3/ h, the methyl alcohol add-on is 5～7L/h, the propane add-on is 0.6～0.7m
3/ h, the ammonia add-on is 5～10L/h, and at the high furnace temperature to 870 of the prerequisite of coming out of the stove ℃, carbon potential 1%C, carries out surperficial carbon restoration, can come out of the stove behind the 30min.
Aforesaid heat treatment process for automobile gear shifting box synchronizer gear sheath, in the wherein said carbonitriding step, carburizing temperature is 785 ± 5 ℃, and carbon potential is 0.55 ± 0.05%, and the nitrogen add-on is 10～12m
3/ h, the methyl alcohol add-on is 4～5L/h, the propane add-on is 0.5～0.6m
3/ h, the ammonia add-on is 0～5L/h, and at the high furnace temperature to 870 of the prerequisite of coming out of the stove ℃, carbon potential 1%C, carries out surperficial carbon restoration, can come out of the stove behind the 35min.
Advantage of the present invention is: through the carbonitriding process is controlled, be aided with again to press quenching but with the fit adjustment of drawing process, adopts new processing parameter can guarantee that product long period in pressure is quenched the protective atmosphere of stove is incubated not decarburization of not oxidation of part.When breaking down, can guarantee that the surface hardness of product, hardened layer, metallographic structure still meet technical requirements under the situation that part extends to 10 hours at in-furnace time.Heat treatment process for automobile gear shifting box synchronizer gear sheath of the present invention is quenched the pressure of synchronizer gear sleeve to produce with quality and has been obtained reliable assurance, avoided causing the product rejection phenomenon because of equipment failure, reduce product disqualification rate and scrap rate significantly, disqualification rate drops to below 2% by 8%, and scrap rate drops to below 0.5% by 3%.Can raise labour productivity more than 5% simultaneously.
Embodiment
Embodiment one
Present embodiment is a heat treatment process for automobile gear shifting box synchronizer gear sheath, carries out according to the following steps: carbonitriding, press quench, cleaning, tempering, detection.Before tooth cover part is produced, the water, electricity and gas of production line relevant device is checked, and furnace temperature in the converter and carbon potential are demarcated.In the carbonitriding step, original carburizing temperature is 870 ± 5 ℃, and carbon potential is 1.0 ± 0.1%, and the nitrogen infiltration capacity is 8～10m
3/ h, the methyl alcohol infiltration capacity is 7～9L/h, the propane infiltration capacity is 0.9～1.0m
3/ h, the ammonia infiltration capacity is 50～55L/h.According to different parts and corresponding techniques requirement, the beat of setting automatic production line is 72～84s.When device fails, in the carbonitriding step, regulating carburizing temperature is 845 ± 5 ℃, and carbon potential is 0.95 ± 0.05%, and the nitrogen infiltration capacity is 5～6m
3/ h, the methyl alcohol infiltration capacity is 5～7L/h, the propane infiltration capacity is 0.8～0.9m
3/ h, the ammonia infiltration capacity is 25～30L/h.Adopt new processing parameter can guarantee product long period insulation in pressure is quenched the protective atmosphere of stove, not decarburization of not oxidation of part.After treating that equipment failure is got rid of, revert to original carbonitriding technology parameter immediately, and the automation line productive temp is adjusted into 60s.During tempering, tempering temperature is brought up to 190 ℃ by 170 ℃.
Embodiment two
Present embodiment is a heat treatment process for automobile gear shifting box synchronizer gear sheath, carries out according to the following steps: carbonitriding, press quench, cleaning, tempering, detection.Before tooth cover part is produced, the water, electricity and gas of production line relevant device is checked, and furnace temperature in the converter and carbon potential are demarcated.In the carbonitriding step, original carburizing temperature is 870 ± 5 ℃, and carbon potential is 1.0 ± 0.1%, and the nitrogen infiltration capacity is 8～10m
3/ h, the methyl alcohol infiltration capacity is 7～9L/h, the propane infiltration capacity is 0.9～1.0m
3/ h, the ammonia infiltration capacity is 50～55L/h.When device fails, in the carbonitriding step, carburizing temperature is 800 ± 5 ℃, and carbon potential is 0.55 ± 0.05%, and the nitrogen infiltration capacity is 9～10m
3/ h, the methyl alcohol infiltration capacity is 5～7L/h, the propane infiltration capacity is 0.6～0.7m
3/ h, the ammonia infiltration capacity is 5～10L/h.At the high furnace temperature to 870 of the prerequisite of coming out of the stove ℃, carbon potential 1%C, carry out surperficial carbon restoration, can come out of the stove behind the 30min.Simultaneously the automation line productive temp is adjusted into 60s.Be aided with a small amount of raising tempering temperature again, promptly tempering temperature brought up to 190 ℃ by 170 ℃.Adopt new processing parameter can guarantee that product long period in pressure is quenched the protective atmosphere of stove stops, not decarburization of not oxidation of part, and metallographic structure and effective case depth can be seriously not overproof.
Embodiment three
Present embodiment is a heat treatment process for automobile gear shifting box synchronizer gear sheath, carry out according to the following steps: carbonitriding, press quench, cleaning, tempering, detection, before tooth cover part is produced, the water, electricity and gas of production line relevant device is checked, and furnace temperature in the converter and carbon potential are demarcated.In the carbonitriding step, original carburizing temperature is 870 ± 5 ℃, and carbon potential is 1.0 ± 0.1%, and the nitrogen infiltration capacity is 8～10m
3/ h, the methyl alcohol infiltration capacity is 7～9L/h, the propane infiltration capacity is 0.9～1.0m
3/ h, the ammonia infiltration capacity is 50～55L/h.When device fails, in the carbonitriding step, carburizing temperature is 785 ± 5 ℃, and carbon potential is 0.55 ± 0.05%, and the nitrogen infiltration capacity is 10～12m
3/ h, the methyl alcohol infiltration capacity is 4～5L/h, the propane infiltration capacity is 0.5～0.6m
3/ h, the ammonia infiltration capacity is 0～5L/h.Be aided with quench fit adjustment with tempering step of pressure again, at the high furnace temperature to 870 of the prerequisite of coming out of the stove ℃, carbon potential 1%C, carry out surperficial carbon restoration, stop to add ammonia this moment, can come out of the stove behind carbon restoration 35～40min in stove.Simultaneously the automation line productive temp is adjusted into 60s.Be aided with a small amount of raising tempering temperature again, promptly tempering temperature brought up to 190 ℃ by 170 ℃.Adopt new processing parameter can guarantee product long period insulation in pressure is quenched the protective atmosphere of stove, not decarburization of not oxidation of part.And metallographic structure and effective case depth can be seriously not overproof.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (4)
1. heat treatment process for automobile gear shifting box synchronizer gear sheath, comprise step: carbonitriding, press quench, cleaning, tempering, detection, it is characterized in that: when device fails, in the described carbonitriding step, carburizing temperature is adjusted into 780～850 ℃, carbon potential is 0.50～1.0%, and the nitrogen add-on is 5～12m
3/ h, the methyl alcohol add-on is 4～7L/h, the propane add-on is 0.5～0.9m
3/ h, the ammonia add-on is 0～30L/h.
2. heat treatment process for automobile gear shifting box synchronizer gear sheath as claimed in claim 1 is characterized in that: in the described carbonitriding step, carburizing temperature is 845 ± 5 ℃, and carbon potential is 0.95 ± 0.05%, and the nitrogen add-on is 5～6m
3/ h, the methyl alcohol add-on is 5～7L/h, the propane add-on is 0.8～0.9m
3/ h, the ammonia add-on is 25～30L/h.
3. heat treatment process for automobile gear shifting box synchronizer gear sheath as claimed in claim 1 is characterized in that: in the described carbonitriding step, carburizing temperature is 800 ± 5 ℃, and carbon potential is 0.55 ± 0.05%, and the nitrogen add-on is 9～10m
3/ h, the methyl alcohol add-on is 5～7L/h, the propane add-on is 0.6～0.7m
3/ h, the ammonia add-on is 5～10L/h.
4. heat treatment process for automobile gear shifting box synchronizer gear sheath as claimed in claim 1 is characterized in that: in the described carbonitriding step, carburizing temperature is 785 ± 5 ℃, and carbon potential is 0.55 ± 0.05%, and the nitrogen add-on is 10～12m
3/ h, the methyl alcohol add-on is 4～5L/h, the propane add-on is 0.5～0.6m
3/ h, the ammonia add-on is 0～5L/h.
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| CNB200710023417XA CN100513646C (en) | 2007-06-01 | 2007-06-01 | Heat treatment process for automobile gear shifting box synchronizer gear sheath |
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| CNB200710023417XA CN100513646C (en) | 2007-06-01 | 2007-06-01 | Heat treatment process for automobile gear shifting box synchronizer gear sheath |
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| CN100513646C CN100513646C (en) | 2009-07-15 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101851735A (en) * | 2010-04-19 | 2010-10-06 | 东风汽车有限公司 | Strengthening process of nodular cast iron and finished product thereof |
| CN102181614A (en) * | 2011-04-08 | 2011-09-14 | 常州克劳诺斯特种轴承制造有限公司 | Quenching process for heat treatment color finished products |
| CN105154815A (en) * | 2015-09-28 | 2015-12-16 | 江苏双环齿轮有限公司 | Carburizing heat treatment method for obtaining high-quality metallographic phase by means of double-row carburizing furnace |
| CN105907935A (en) * | 2016-06-03 | 2016-08-31 | 太仓市沪太热处理厂 | Thermal processing process for metal workpiece |
| CN106637060A (en) * | 2016-10-20 | 2017-05-10 | 洛阳Lyc轴承有限公司 | Carbonitriding heat treatment technique under new atmosphere |
| CN110257761A (en) * | 2019-06-14 | 2019-09-20 | 武汉汇九厨具科技有限公司 | A kind of not viscous iron pan of method of no-coating abrasion-proof antirust and its manufacturing process |
-
2007
- 2007-06-01 CN CNB200710023417XA patent/CN100513646C/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101851735A (en) * | 2010-04-19 | 2010-10-06 | 东风汽车有限公司 | Strengthening process of nodular cast iron and finished product thereof |
| CN101851735B (en) * | 2010-04-19 | 2011-09-07 | 东风汽车有限公司 | Strengthening process of nodular cast iron and finished product thereof |
| CN102181614A (en) * | 2011-04-08 | 2011-09-14 | 常州克劳诺斯特种轴承制造有限公司 | Quenching process for heat treatment color finished products |
| CN102181614B (en) * | 2011-04-08 | 2012-11-28 | 常州克劳诺斯特种轴承制造有限公司 | Quenching process for heat treatment color finished products |
| CN105154815A (en) * | 2015-09-28 | 2015-12-16 | 江苏双环齿轮有限公司 | Carburizing heat treatment method for obtaining high-quality metallographic phase by means of double-row carburizing furnace |
| CN105154815B (en) * | 2015-09-28 | 2017-07-04 | 江苏双环齿轮有限公司 | A kind of carburizing heat treatment method that high-quality metallographic is obtained using double carburizer |
| CN105907935A (en) * | 2016-06-03 | 2016-08-31 | 太仓市沪太热处理厂 | Thermal processing process for metal workpiece |
| CN106637060A (en) * | 2016-10-20 | 2017-05-10 | 洛阳Lyc轴承有限公司 | Carbonitriding heat treatment technique under new atmosphere |
| CN106637060B (en) * | 2016-10-20 | 2019-02-05 | 洛阳Lyc轴承有限公司 | A kind of carbo-nitriding heat-treatment technology method |
| CN110257761A (en) * | 2019-06-14 | 2019-09-20 | 武汉汇九厨具科技有限公司 | A kind of not viscous iron pan of method of no-coating abrasion-proof antirust and its manufacturing process |
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|---|---|
| CN100513646C (en) | 2009-07-15 |
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