CN104480282A - Crankshaft thermal refining method - Google Patents
Crankshaft thermal refining method Download PDFInfo
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- CN104480282A CN104480282A CN201410648845.1A CN201410648845A CN104480282A CN 104480282 A CN104480282 A CN 104480282A CN 201410648845 A CN201410648845 A CN 201410648845A CN 104480282 A CN104480282 A CN 104480282A
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- crankshaft casting
- automatic modeling
- tempering
- crankshaft
- casting
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Abstract
The invention discloses a crankshaft thermal refining method, which belongs to the technical field of machinery manufacturing, and comprises the following steps: (1) putting a crankshaft casting in to a heating furnace, heating to 400-430 DEG C, then holding for 1-2h, and taking out; (2) heating the crankshaft casting which is rapidly pre heated by the step (1) to 850-900 DEG C, holding for 3-4h; (3) putting the crankshaft casting with a matrix fully austenitized by the step (2) into oil for quenching; (4) tempering the crankshaft casting processed by the step (3) at the tempering temperature of 550 to 600 DEG C, and after tempering, cooling in air. The crankshaft thermal refining method solves the problems of short service life caused by long time effect of alternating stress in the work process of a crankshaft made of spheroidal graphite cast iron in the prior art, and the method has the advantages of simple method, low cost, and easy processing.
Description
Technical field
The invention belongs to machinery manufacturing technology field, more particularly, relate to a kind of hardening and tempering method improving bent axle mechanical property.
Background technology
Spheroidal graphite cast iron is obtained by nodularization and inoculation, effectively improves the mechanical property of cast iron, in particular improve plasticity and toughness, thus obtain the intensity also higher than carbon steel.Spheroidal graphite cast iron is a kind of meehanite cast iron material grown up the 1950's, and its over-all properties, close to steel, just based on the performance of its excellence, has been successfully used to cast some stressed complexity, and intensity, toughness, wear resistance require higher part.
Bent axle is the important parts on engine, and after loading onto connecting rod, pumping of connecting rod can be changed into rotary motion by it, and it is generally be made up of spheroidal graphite cast iron.Bent axle has two significant points---and main journal and connecting rod neck, because it needs the effect of bearing continuous repeated stress, have higher requirement for mechanical property, and its profile relative complex, therefore becomes a bottleneck key element of crankshaft designs the work-ing life of bent axle simultaneously.
Summary of the invention
For the existing bent axle utilizing spheroidal graphite cast iron to manufacture in the course of the work, because being subject to the effect of repeated stress for a long time, and the problem causing its work-ing life of short duration, the invention provides a kind of hardening and tempering method of bent axle, by adopting specific modifier treatment to automatic modeling crankshaft casting, acquisition take tempered sorbite as the spheroidal graphite casting of matrix, reaches the object improving its mechanical property, increase its work-ing life.
For solving the problem, the present invention adopts following technical scheme.
A hardening and tempering method for bent axle, comprises the following steps:
(1) automatic modeling crankshaft casting is put in process furnace, be heated to 400-430 DEG C, be then incubated 1-2
hrear taking-up, completes the thermal pretreatment to automatic modeling crankshaft casting;
(2) automatic modeling crankshaft casting after step (1) thermal pretreatment is heated to 850-900 DEG C rapidly, insulation 3-4
h, make the whole austenitizing of matrix;
(3) automatic modeling crankshaft casting of the whole austenitizing of matrix will be made after step (2), and put into oil quenching, obtain fine platy martensitic matrix and spherical graphite;
(4) automatic modeling crankshaft casting through step (3) is carried out temper, tempering temperature is 550-600 DEG C, air cooling after tempering, makes automatic modeling crankshaft casting be converted into tempered sorbite matrix.
Preferably, in described step (1), automatic modeling crankshaft casting is heated to 420 DEG C, is then incubated 1.5
hrear taking-up.
Preferably, in described step (2), automatic modeling crankshaft casting is heated to 880 DEG C, insulation 3.5
h.
Preferably, in described step (4), tempering temperature is 580 DEG C.
Compared to prior art, beneficial effect of the present invention is:
(1) the present invention is by adopting specific modifier treatment to automatic modeling crankshaft casting, and obtaining with tempered sorbite is the spheroidal graphite casting of matrix, its mechanical property is significantly improved, meets the job requirement of bent axle.
(2) the inventive method is simple, and cost is low, handling ease.
Embodiment
Describe the present invention below in conjunction with embodiment.
embodiment 1
A hardening and tempering method for bent axle, comprises the following steps:
(1) automatic modeling crankshaft casting is put in process furnace, be heated to 400 DEG C, be then incubated 1
hrear taking-up, completes the thermal pretreatment to automatic modeling crankshaft casting;
(2) automatic modeling crankshaft casting after step (1) thermal pretreatment is heated to rapidly 850 DEG C, insulation 3
h, make the whole austenitizing of matrix;
(3) automatic modeling crankshaft casting of the whole austenitizing of matrix will be made after step (2), and put into oil quenching, obtain fine platy martensitic matrix and spherical graphite;
(4) automatic modeling crankshaft casting through step (3) is carried out temper, tempering temperature is 550 DEG C, air cooling after tempering, makes automatic modeling crankshaft casting be converted into tempered sorbite matrix.
embodiment 2
A hardening and tempering method for bent axle, comprises the following steps:
(1) automatic modeling crankshaft casting is put in process furnace, be heated to 430 DEG C, be then incubated 2
hrear taking-up, completes the thermal pretreatment to automatic modeling crankshaft casting;
(2) automatic modeling crankshaft casting after step (1) thermal pretreatment is heated to rapidly 900 DEG C, insulation 4
h, make the whole austenitizing of matrix;
(3) automatic modeling crankshaft casting of the whole austenitizing of matrix will be made after step (2), and put into oil quenching, obtain fine platy martensitic matrix and spherical graphite;
(4) automatic modeling crankshaft casting through step (3) is carried out temper, tempering temperature is 600 DEG C, air cooling after tempering, makes automatic modeling crankshaft casting be converted into tempered sorbite matrix.
Claims (4)
1. a hardening and tempering method for bent axle, is characterized in that following steps:
(1) automatic modeling crankshaft casting is put in process furnace, be heated to 400-430 DEG C, be then incubated 1-2
hrear taking-up, completes the thermal pretreatment to automatic modeling crankshaft casting;
(2) automatic modeling crankshaft casting after step (1) thermal pretreatment is heated to 850-900 DEG C rapidly, insulation 3-4
h, make the whole austenitizing of matrix;
(3) automatic modeling crankshaft casting of the whole austenitizing of matrix will be made after step (2), and put into oil quenching, obtain fine platy martensitic matrix and spherical graphite;
(4) automatic modeling crankshaft casting through step (3) is carried out temper, tempering temperature is 550-600 DEG C, air cooling after tempering, makes automatic modeling crankshaft casting be converted into tempered sorbite matrix.
2. the hardening and tempering method of a kind of bent axle according to claim 1, is characterized in that, in described step (1), automatic modeling crankshaft casting is heated to 420 DEG C, is then incubated 1.5
hrear taking-up.
3. the hardening and tempering method of a kind of bent axle according to claim 1, is characterized in that, in described step (2), automatic modeling crankshaft casting is heated to 880 DEG C, insulation 3.5
h.
4. the hardening and tempering method of a kind of bent axle according to claim 1, is characterized in that, in described step (4), tempering temperature is 580 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410648845.1A CN104480282A (en) | 2014-11-17 | 2014-11-17 | Crankshaft thermal refining method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410648845.1A CN104480282A (en) | 2014-11-17 | 2014-11-17 | Crankshaft thermal refining method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104480282A true CN104480282A (en) | 2015-04-01 |
Family
ID=52754884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410648845.1A Pending CN104480282A (en) | 2014-11-17 | 2014-11-17 | Crankshaft thermal refining method |
Country Status (1)
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| CN (1) | CN104480282A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831050A (en) * | 2015-05-13 | 2015-08-12 | 广西梧州运龙港船机械制造有限公司 | Hardening and tempering process of marine nodular cast iron crankshaft |
| CN105331874A (en) * | 2015-09-26 | 2016-02-17 | 山东惠宇精密机械有限公司 | Spheroidal graphite cast iron cast gear and machining process thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62260014A (en) * | 1986-05-02 | 1987-11-12 | Nissan Motor Co Ltd | Production of wear resistant cast iron member |
| CN101445867A (en) * | 2008-12-25 | 2009-06-03 | 中国北车集团大连机车车辆有限公司 | Heat treatment method for high-power locomotive diesel engine crankshafts |
| CN101724741A (en) * | 2008-10-20 | 2010-06-09 | 乐金电子(天津)电器有限公司 | Method for manufacturing compressor crankshaft |
| CN102329943A (en) * | 2010-07-12 | 2012-01-25 | 中国有色（沈阳）冶金机械有限公司 | Thermal treatment method for large electroslag smelting cast 42CrMo steel crankshaft |
-
2014
- 2014-11-17 CN CN201410648845.1A patent/CN104480282A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62260014A (en) * | 1986-05-02 | 1987-11-12 | Nissan Motor Co Ltd | Production of wear resistant cast iron member |
| CN101724741A (en) * | 2008-10-20 | 2010-06-09 | 乐金电子(天津)电器有限公司 | Method for manufacturing compressor crankshaft |
| CN101445867A (en) * | 2008-12-25 | 2009-06-03 | 中国北车集团大连机车车辆有限公司 | Heat treatment method for high-power locomotive diesel engine crankshafts |
| CN102329943A (en) * | 2010-07-12 | 2012-01-25 | 中国有色（沈阳）冶金机械有限公司 | Thermal treatment method for large electroslag smelting cast 42CrMo steel crankshaft |
Non-Patent Citations (2)
| Title |
|---|
| 支道光主编: "《实用热处理工艺守则》", 31 May 2013 * |
| 陈友伟等主编: "《金属材料与热处理》", 31 January 2014 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831050A (en) * | 2015-05-13 | 2015-08-12 | 广西梧州运龙港船机械制造有限公司 | Hardening and tempering process of marine nodular cast iron crankshaft |
| CN105331874A (en) * | 2015-09-26 | 2016-02-17 | 山东惠宇精密机械有限公司 | Spheroidal graphite cast iron cast gear and machining process thereof |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 241000, Wuhu economic and Technological Development Zone, Hengshan Road, No. 35, electronic Pioneer Park, room 605-606 Applicant after: Wuhu Force Precision Mold Co., Ltd. Address before: 241000 No. 215 Changjiang Road, Anhui, Wuhu Applicant before: Wuhu Force Precision Mold Co., Ltd. |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: No. 215, Changjiang Road, Wuhu, Anhui, Anhui Applicant after: Wuhu Force Precision Mold Co., Ltd. Address before: 241000 Anhui Wuhu economic and Technological Development Zone, Hengshan Road 35 electronic Pioneer Park 605-606. Applicant before: Wuhu Force Precision Mold Co., Ltd. |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150401 |