CN105349737A - Double-frequency triple-effect induction quenching process for cold roll - Google Patents
Double-frequency triple-effect induction quenching process for cold roll Download PDFInfo
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- CN105349737A CN105349737A CN201510782579.6A CN201510782579A CN105349737A CN 105349737 A CN105349737 A CN 105349737A CN 201510782579 A CN201510782579 A CN 201510782579A CN 105349737 A CN105349737 A CN 105349737A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a double-frequency triple-effect induction quenching process for a cold roll. The process includes the following technological steps that (1) the roll is preheated, (2) induction quenching heat treatment is carried out on the roll, and (3) tempering is carried out on the roll. According to the process, through gap adjustment of a quenching inductor and control over the moving speed of the roll, the problem that the depth of a quench-hardened layer and structure properties cannot be considered at the same time is solved effectively, and the depth of the quench-hardened layer of the roll is increased.
Description
Technical field
The present invention relates to roll manufacturing technology field, especially a kind of double frequency triple effect cold roll induction hardening process.
Background technology
Cold roll is the main working parts of cold sheet mill, and it decides the productivity of mill bar quality and milling train.Require down that cold roll has very high intensity, good toughness and wear resistance, require that cold roll has darker quench-hardened case in addition, and depth of hardening zone is realized by quenching technology in working order.
Determine suitable roller quenching technique, under the best use properties prerequisite of guarantee roll, reaching darker depth of hardening zone, is that roll manufactures indispensable key link.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of double frequency triple effect cold roll induction hardening process, to improve the depth of hardening zone of roll.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
Double frequency triple effect cold roll induction hardening process, described induction hardening process comprises following process steps,
1) breaker roll carries out thermal pretreatment;
2) breaker roll carries out induction quenching thermal treatment;
3) breaker roll carries out temper.
The further improvement of technical solution of the present invention is: described step 1) in the detailed process of thermal pretreatment be that adopt car type furnace that roll is preheated to 250 ~ 400 DEG C, warm up time is 10 ~ 20h.
The further improvement of technical solution of the present invention is: described step 2) in the heat treated detailed process of induction quenching be, roll after thermal pretreatment is placed in double frequency triple effect induction hardening equipment according to certain frock position, first adopt the roll of induction heating circle to movement from top to bottom to heat, then adopt water-jet to carry out water-spraying control quenching to the roll after heating.
The further improvement of technical solution of the present invention is: the gap between described induction heating circle and roll is 15 ~ 30mm, and the translational speed of described roll is 0.3 ~ 0.8mm/s.
The further improvement of technical solution of the present invention is: set gradually the first induction heating circle from top to bottom in described double frequency triple effect induction hardening equipment, second induction heating circle, 3rd induction heating circle, the Heating temperature of described first induction heating circle is 850 ~ 940 DEG C, the Heating temperature of the second induction heating circle is 850 ~ 940 DEG C, the Heating temperature of the 3rd induction heating circle is 850 ~ 940 DEG C, distance between described first induction heating circle and the second induction heating circle is 10 ~ 50mm, distance between described second induction heating circle and the 3rd induction heating circle is 40 ~ 80mm.
The further improvement of technical solution of the present invention is: the distance between described water-jet and the 3rd induction heating circle is 10 ~ 60mm, described water-jet is symmetrical arranged several water jets, is spaced apart 5 ~ 30mm between described water jet.
The further improvement of technical solution of the present invention is: the spray flow of described water jet is 4000 ~ 8000ml/min.
The further improvement of technical solution of the present invention is: described step 3) in the detailed process of temper be, after induction quenching thermal treatment, roll is put into tempering stove tempering, tempering temperature is 100 ~ 480 DEG C, and tempering time is 40 ~ 120h.
The further improvement of technical solution of the present invention is: the surface hardness of described roll is 75 ~ 100HSD.
Owing to have employed technique scheme, the technical progress that the present invention obtains is:
The present invention passes through the control to quenching inducer gap adjustment and roll translational speed, the difficult problem that effective solution depth of hardening zone and structure property can not be taken into account.Adopt the cold roll that present invention process method is obtained, have higher depth of hardening zone, prove through production test, depth of hardening zone comparatively common process diametric(al) can improve more than 15mm, meets all working rolls used for cold rolling mill and the service requirements of intermediate roll working lining.Hardened layer of roller hardness is within 75 ~ 100HSD, and the body of roll is organized evenly fine and closely woven, ensures the use propertieies such as the wear resistance of cold roll.
The present invention adopts double frequency induction technique, deepens the degree of depth of surface heating layer and extends the austenitizing time of surface heating layer, thus obtaining darker quench-hardened case.Choosing of induction heating circle is crucial, the present invention is by three induction heating circles, control the gap of roll and inductor block simultaneously well, both ensured to make to be difficult to reach quenching temperature within the scope of the certain depth of top layer because of excessive clearance, thus caused depth of hardening zone not enough; Also hardened layer hardness gradient will be caused bad because of the too small meeting in gap.Under output rating one stable condition, rate of heating is decided by roll translational speed, and the present invention is by controlling the translational speed of roll, and both avoided translational speed too fast, diathermanous layer is shallow, and quench-hardened case does not reach re-set target; Avoid again translational speed too slow, roll top layer is easily overheated, causes the body of roll to organize thick, and the anti-accident performance of roll reduces.
Embodiment
Double frequency triple effect cold roll induction hardening process disclosed by the invention, comprises following process steps,
1) breaker roll carries out thermal pretreatment.
In this step, the detailed process of thermal pretreatment is, adopt car type furnace that roll is preheated to 250 ~ 400 DEG C, warm up time is 10 ~ 20h.
2) breaker roll carries out induction quenching thermal treatment.
In this step, the heat treated detailed process of induction quenching is, roll after thermal pretreatment is placed in double frequency triple effect induction hardening equipment according to certain frock position, first adopt the roll of induction heating circle to movement from top to bottom to heat, then adopt water-jet to carry out water-spraying control quenching to the roll after heating.
Gap in this step between induction heating circle and roll is 15 ~ 30mm, and the translational speed of roll is 0.3 ~ 0.8mm/s.
The first induction heating circle, the second induction heating circle, the 3rd induction heating circle is set gradually in double frequency triple effect induction hardening equipment from top to bottom in this step, the Heating temperature of the first induction heating circle is 850 ~ 940 DEG C, the Heating temperature of the second induction heating circle is 850 ~ 940 DEG C, the Heating temperature of the 3rd induction heating circle is 850 ~ 940 DEG C, distance between first induction heating circle and the second induction heating circle is 10 ~ 50mm, and the distance between the second induction heating circle and the 3rd induction heating circle is 40 ~ 80mm.
Distance in this step between water-jet and the 3rd induction heating circle is 10 ~ 60mm, water-jet is symmetrical arranged several water jets, is spaced apart 5 ~ 30mm between water jet.The spray flow of water jet is 4000 ~ 8000ml/min.
3) breaker roll carries out temper.
In this step, the detailed process of temper is, after induction quenching thermal treatment, roll is put into tempering stove tempering, and tempering temperature is 100 ~ 480 DEG C, and tempering time is 40 ~ 120h.
The surface hardness of the roll that above-mentioned steps obtains is 75 ~ 100HSD.
Below in conjunction with embodiment, the present invention is described in further details:
Embodiment 1
For the cold roll that A factory produces, roll diameter φ 500mm.
Induction hardening process comprises following process steps,
1) breaker roll carries out thermal pretreatment.
Particularly, adopt car type furnace that roll is preheated to 350 DEG C, warm up time is 18h.
2) breaker roll carries out induction quenching thermal treatment.
Particularly, roll after thermal pretreatment is placed in double frequency triple effect induction hardening equipment according to certain frock position, first adopt the roll of induction heating circle to movement from top to bottom to heat, then adopt water-jet to carry out water-spraying control quenching to the roll after heating.The translational speed of roll is 0.5mm/s.
The first induction heating circle, the second induction heating circle, the 3rd induction heating circle is set gradually from top to bottom in double frequency triple effect induction hardening equipment, the diameter of the first induction heating circle is 530mm, Heating temperature is 900 DEG C, the diameter of the second induction heating circle is 554mm, Heating temperature is 900 DEG C, the diameter of the 3rd induction heating circle is 546mm, Heating temperature is 900 DEG C, distance between first induction heating circle and the second induction heating circle is 15mm, and the distance between the second induction heating circle and the 3rd induction heating circle is 50mm.
Distance between water-jet and the 3rd induction heating circle is 10mm, water-jet is symmetrical arranged several water jets, is spaced apart 5mm between water jet.The spray flow of water jet is 6000ml/min.
3) breaker roll carries out temper.
Particularly, after induction quenching thermal treatment, roll is put into tempering stove tempering, tempering temperature is 140 DEG C, and tempering time is 100h.
The surface hardness of the cold roll that the present embodiment obtains is 92 ~ 94HSD, microstructure martensite 2 grades, depth of hardening zone >=42mm.
Embodiment 2
For the cold roll that B factory produces, roll diameter φ 450mm.
The processing step of the present embodiment is close with embodiment 1, differs shown in other concrete heat treatment parameter arranges see embodiment in table 12 with embodiment 1,
The surface hardness of the cold roll that the present embodiment obtains is 94 ~ 96HSD, microstructure martensite 2 grades, depth of hardening zone >=32mm.
Embodiment 3
For the cold-rolling intermediate roll that C factory produces, roll diameter φ 650mm.
The processing step of the present embodiment is close with embodiment 1, differs shown in other concrete heat treatment parameter arranges see embodiment in table 13 with embodiment 1,
The surface hardness of the cold roll that the present embodiment obtains is 80 ~ 82HSD, is organized as tempered sorbite, depth of hardening zone >=41mm.
Embodiment 4
For the cold-rolling intermediate roll that D factory produces, roll diameter φ 490mm.
The processing step of the present embodiment is close with embodiment 1, differs shown in other concrete heat treatment parameter arranges see embodiment in table 14 with embodiment 1,
The surface hardness of the cold roll that the present embodiment obtains is 80 ~ 82HSD, is organized as tempered sorbite, depth of hardening zone >=35mm.
Table 1 embodiment 1 ~ 4 cold roll heat treatment parameter synopsis
The present invention is used for the quenching process of cold roll, obtains higher depth of hardening zone and good structure property, is easy to control, steady quality.Through applying the inventive method on multiple stage Induction Hardening Machine, producing the cold roll product of multiple different size, constant product quality, using on the machine respond well.
Claims (9)
1. double frequency triple effect cold roll induction hardening process, is characterized in that: described induction hardening process comprises following process steps,
1) breaker roll carries out thermal pretreatment;
2) breaker roll carries out induction quenching thermal treatment;
3) breaker roll carries out temper.
2. double frequency triple effect cold roll induction hardening process according to claim 1, is characterized in that: described step 1) in the detailed process of thermal pretreatment be that adopt car type furnace that roll is preheated to 250 ~ 400 DEG C, warm up time is 10 ~ 20h.
3. double frequency triple effect cold roll induction hardening process according to claim 1, it is characterized in that: described step 2) in the heat treated detailed process of induction quenching be, roll after thermal pretreatment is placed in double frequency triple effect induction hardening equipment according to certain frock position, first adopt the roll of induction heating circle to movement from top to bottom to heat, then adopt water-jet to carry out water-spraying control quenching to the roll after heating.
4. double frequency triple effect cold roll induction hardening process according to claim 3, is characterized in that: the gap between described induction heating circle and roll is 15 ~ 30mm, and the translational speed of described roll is 0.3 ~ 0.8mm/s.
5. double frequency triple effect cold roll induction hardening process according to claim 3, it is characterized in that: in described double frequency triple effect induction hardening equipment, set gradually the first induction heating circle from top to bottom, second induction heating circle, 3rd induction heating circle, the Heating temperature of described first induction heating circle is 850 ~ 940 DEG C, the Heating temperature of the second induction heating circle is 850 ~ 940 DEG C, the Heating temperature of the 3rd induction heating circle is 850 ~ 940 DEG C, distance between described first induction heating circle and the second induction heating circle is 10 ~ 50mm, distance between described second induction heating circle and the 3rd induction heating circle is 40 ~ 80mm.
6. double frequency triple effect cold roll induction hardening process according to claim 5, it is characterized in that: the distance between described water-jet and the 3rd induction heating circle is 10 ~ 60mm, described water-jet is symmetrical arranged several water jets, between described water jet, is spaced apart 5 ~ 30mm.
7. double frequency triple effect cold roll induction hardening process according to claim 6, is characterized in that: the spray flow of described water jet is 4000 ~ 8000ml/min.
8. double frequency triple effect cold roll induction hardening process according to claim 1, it is characterized in that: described step 3) in the detailed process of temper be, after induction quenching thermal treatment, roll is put into tempering stove tempering, tempering temperature is 100 ~ 480 DEG C, and tempering time is 40 ~ 120h.
9. the double frequency triple effect cold roll induction hardening process according to any one of claim 1 ~ 8, is characterized in that: the surface hardness of described roll is 75 ~ 100HSD.
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| CN201510782579.6A CN105349737A (en) | 2015-11-16 | 2015-11-16 | Double-frequency triple-effect induction quenching process for cold roll |
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| CN201510782579.6A CN105349737A (en) | 2015-11-16 | 2015-11-16 | Double-frequency triple-effect induction quenching process for cold roll |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106868267A (en) * | 2017-03-21 | 2017-06-20 | 中聚信海洋工程装备有限公司 | A kind of D2Steel roll double frequency heat treatment quenching process and device |
| CN107058683A (en) * | 2017-04-21 | 2017-08-18 | 圣智（福建）热处理有限公司 | A kind of dandy roll mould surface induction hardening process |
| CN108130403A (en) * | 2017-12-25 | 2018-06-08 | 中钢集团邢台机械轧辊有限公司 | A kind of impewdance matching processing method of Cr12 rolls |
| CN108251604A (en) * | 2018-02-05 | 2018-07-06 | 绵阳华晨瑞安汽车零部件有限公司 | The cam bit induction hardening process of casting camshaft |
| CN109609728A (en) * | 2018-10-30 | 2019-04-12 | 河南中原特钢装备制造有限公司 | A kind of support roll surface heat treatment process |
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| CN1840714A (en) * | 2005-03-29 | 2006-10-04 | 宝钢集团常州轧辊制造公司 | Method for making quench hardening layer of cold roll barrel |
| CN101215628A (en) * | 2008-01-11 | 2008-07-09 | 北京工业大学 | High speed steel composite roller heat treatment method |
| JP2013002496A (en) * | 2011-06-14 | 2013-01-07 | Ntn Corp | Heat treatment method, outside joint member, and tripod-type constant velocity universal joint |
| CN104561505A (en) * | 2014-12-30 | 2015-04-29 | 中钢集团邢台机械轧辊有限公司 | Large-size roller sheath surface induction quenching method |
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2015
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Patent Citations (4)
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| JP2013002496A (en) * | 2011-06-14 | 2013-01-07 | Ntn Corp | Heat treatment method, outside joint member, and tripod-type constant velocity universal joint |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106868267A (en) * | 2017-03-21 | 2017-06-20 | 中聚信海洋工程装备有限公司 | A kind of D2Steel roll double frequency heat treatment quenching process and device |
| CN106868267B (en) * | 2017-03-21 | 2018-04-06 | 中聚信海洋工程装备有限公司 | A kind of D2Steel roll double frequency heat treatment quenching process and device |
| CN107058683A (en) * | 2017-04-21 | 2017-08-18 | 圣智（福建）热处理有限公司 | A kind of dandy roll mould surface induction hardening process |
| CN108130403A (en) * | 2017-12-25 | 2018-06-08 | 中钢集团邢台机械轧辊有限公司 | A kind of impewdance matching processing method of Cr12 rolls |
| CN108130403B (en) * | 2017-12-25 | 2020-09-15 | 中钢集团邢台机械轧辊有限公司 | Induction quenching processing method of Cr12 roller |
| CN108251604A (en) * | 2018-02-05 | 2018-07-06 | 绵阳华晨瑞安汽车零部件有限公司 | The cam bit induction hardening process of casting camshaft |
| CN109609728A (en) * | 2018-10-30 | 2019-04-12 | 河南中原特钢装备制造有限公司 | A kind of support roll surface heat treatment process |
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Application publication date: 20160224 |