CN1861812A - Heat treatment method of high speed steel cold rolling roller end - Google Patents
Heat treatment method of high speed steel cold rolling roller end Download PDFInfo
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- CN1861812A CN1861812A CN 200610012855 CN200610012855A CN1861812A CN 1861812 A CN1861812 A CN 1861812A CN 200610012855 CN200610012855 CN 200610012855 CN 200610012855 A CN200610012855 A CN 200610012855A CN 1861812 A CN1861812 A CN 1861812A
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- speed steel
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Abstract
A heat-treating method relates to the end of quick-cutting steel's cold roll, it includes the processes as follows: a. putting the quick-cutting steel's cold roll into the salt-bath furnace with 1160+-5 deg.C and heating 16-24 min, b. taking it out ,putting in the nitrate furnace with 240-280 deg.C and cooling 25-35 min at this temperature, c. taking it out and then putting the end of it into the salt-bath furnace at 800-850 deg.C and heating 5-10 min, d. taking it out from the salt-bath furnace and holding in the nitrate furnace at 240-280 deg.C for 20-40min, e. taking it out and cooling at 50-80 deg.C with air, f. putting the end of quick-cutting steel's cold roll into nitrate furnace at 560-570 deg.C and heating longer than 60min, g. then taking it out and cooling at room-temperature, h. reduplicating processes of f and g twice. This heat-treating method can not make the end of the cold roll cracked and hold the degree of hardness no lower than 60HRC, it don't affect the hardness of roller at the same time.
Description
Technical field
The present invention relates to a kind of heat treatment method of high speed steel cold rolling roller end.
Background technology
Rapid steel work cold roll is when quenching, and principal character is to quench in the whole body, and tissue is based on martensite, and its specific volume is bigger than tissue before quenching, and behind the roller quenching volumetric expansion can take place.Because in the quench cooled process, the martensitic stucture transformation hysteresis in the roll forms roll central tissue's pressurized and the stress distribution of surface structure tension in the surface of roll.When the roller surface tensile stress surpasses the tensile strength of steel, then crack.If the roughness R of roller surface
aWhen wedge angle appearred in big or geometrical dimension, as the screw thread of working roll end central hole, stress can focus on sharp corner, germinates formation of crack like this.In the high-speed steel roll production process, find,, carry out the conventional high-temperature tempering process of continuous several times immediately, still can not avoid the appearance of roll end crackle even after employing can alleviate the nitrate furnace isothermal quenching technique of roll stress concentration.Though improve the appearance that tempering temperature can be avoided roll end crackle, roller body hardness does not reach technical requirements.So, the end of rapid steel work cold roll has only employing to be higher than the localized tempering technology of conventional temperature, at present, this is the unique method that solves roll end thermal treatment generation crackle, but how the case heat treating method of cold rolling roller end is cut in the complete processing of cold roll, how to select correct the localized tempering temperature and time and the type of cooling, to guarantee that cold roll cold rolling roller end when the thermal treatment does not ftracture and end hardness is not less than 60HR
CDo not influence simultaneously the hardness of roller body, also do not have the precedent of success.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing heat treatment method of high speed steel cold rolling roller end, the invention provides a kind of end rimose heat treatment method of high speed steel cold rolling roller end of avoiding.
Heat treating method of the present invention is in nitrate furnace (240 ℃～280 ℃) isothermal cooling phase-change process in the point of penetration of high speed steel cold roller complete processing, at isothermal after for some time, after rapid steel work cold roll temporarily shifted out nitrate furnace, rapid heating in 800 ℃-850 ℃ the salt bath furnace is inserted in the end that need handle cold roll, promptly at high speed steel cold roller A
C1Carry out local fast heating near the point, behind the insulation 5-15min, again work roll is inserted and carry out the isothermal cooling in the former nitrate furnace, shift out the nitrate furnace air cooling after cooling time again to room temperature, carry out the promptly about 560 ℃ of tempering process of conventional high temperature of continuous several times then immediately up to the isothermal of finishing regulation.
This rapid steel work roll end heat treating method comprises following successively step:
A. high speed steel cold roller is inserted 1160 ℃ ± 5 ℃ salt bath furnace heating 16-24 minute, then high speed steel cold roller is taken out salt bath furnace;
B. again high speed steel cold roller is inserted in 240 ℃～280 ℃ nitrate furnaces and cooled off 25-35 minute, make high speed steel cold roller be cooled to isothermal temperature, then high speed steel cold roller is taken out nitrate furnace;
C. high speed steel cold rolling roller end was inserted in 800 ℃ of-850 ℃ of salt bath furnaces heating after 5-10 minute, high speed steel cold rolling roller end is taken out salt bath furnace;
D. again high speed steel cold roller was inserted in 240 ℃～280 ℃ nitrate furnaces isothermal 20-40 minute, be generally 30 minutes, take out nitrate furnace;
E. high speed steel cold roller is cooled to 50 ℃～80 ℃ in air;
F. high speed steel cold roller being inserted 560 ℃～570 ℃ nitrate furnace heating cooled off air from the nitrate furnace taking-up after 60-80 minute;
G. high speed steel cold roller cool to room temperature in air, promptly the envrionment temperature of job shop all can for-30 ℃～60 ℃;
H. again high speed steel cold roller is inserted 560 ℃～570 ℃ nitrate furnace heating after and take out from nitrate furnace after 60-80 minute, cool to room temperature in air repeats step f and step g twice so more then.
J. it is better step f and step g to be repeated primary effect again.
In existing high speed steel cold roller machining process, inserting the end before nitrate furnace cooling back and nitrate furnace tempering changes the salt bath furnace rapid heating over to and inserts the nitrate furnace heat treating method of cool to room temperature then, guarantee that do not ftracture in roll roll end when thermal treatment and end hardness is not less than 60HRC, do not influence simultaneously the hardness of roller body, method is simple, and the technology cost is low.
Description of drawings
Fig. 1 is a rapid steel work roll structure iron.
Among the above-mentioned figure:
1, centre hole 2, end 3, end partial heat treatment district
4, roller body 5, roller neck
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment and accompanying drawing thereof, but the specific embodiment of the present invention is not limited to following embodiment.
What present embodiment was handled is ZR22B-52 type milling train rapid steel work cold roll.The material of high speed steel cold roller is high speed steel W 6 Mo5Cr4V2, and the physical dimension of high speed steel cold roller is Φ 63.5 * 1444mm.
The high speed steel cold roller heat treating method step of present embodiment is as follows:
A. high speed steel cold roller is inserted 1160 ℃ ± 5 ℃ salt bath furnace heating 20 minutes, then high speed steel cold roller is taken out salt bath furnace;
B. again high speed steel cold roller is inserted in 260 ℃ of nitrate furnaces and cooled off 30 minutes, then high speed steel cold roller is taken out nitrate furnace;
C. heating was inserted in 830 ℃ of salt bath furnaces after 5-10 minute by the partial heat treatment district, end 3 of high speed steel cold rolling roller end 2, high speed steel cold rolling roller end 2 is taken out salt bath furnaces;
D. again high speed steel cold roller is inserted in 260 ℃ of nitrate furnaces isothermal 30 minutes, take out nitrate furnace;
E. high speed steel cold roller is as cold as 60 ℃ in air;
F. high speed steel cold roller being inserted 565 ℃ of nitrate furnace heating cooled off air from the nitrate furnace taking-up after 60 minutes;
G. high speed steel cold roller is cooled to the temperature in work workshop in air;
H. again high speed steel cold roller is inserted 560 ℃ of nitrate furnace heating after and take out from nitrate furnace after 60 minutes, in air, be as cold as room temperature then, like this step f and step g are repeated twice again.
Through after the above-mentioned processing, the hardness in the end face of rapid steel work cold roll and end partial heat treatment district 3 reaches 60HRC, and hardness of roll body reaches 62～64HRc, and the whole high speed steel cold roller body of roll 4 do not have crackle, and the high speed steel cold roller overall performance is unaffected.
1, the physical dimension of rapid steel work cold roll is Φ 63.5
± 0.06* 1444mm.
2, body of roll cylindricity 0.007mm, surface roughness Ra are 0.2.
3, working roll, hardness of roll body 62～64HRc, end heating position 60～62HRc, body of roll linearity≤1mm after the tempering of quenching.
4, roll carries out ultrasonic wave+magnetic-particle inspection: roller surface, inside do not have crackle and tissue defects.
5, thoroughly solve roll in the use and concentrate, cause roll rimose problem because of end stress.
Temperature adopts (KNO in the nitrate furnace of present embodiment
350+NaNO
350) fusing point; 218 ℃, working temperature; 230～550 ℃.
High temperature adopts (KNO
3100) fusing point; 337 ℃, working temperature; 350～600 ℃.
Specific volume in the present specification: the specific volume of unit surface.
Claims (1)
1, a kind of heat treatment method of high speed steel cold rolling roller end comprises following successively step:
A. high speed steel cold roller is inserted 1160 ℃ ± 5 ℃ salt bath furnace heating 16-24 minute, then high speed steel cold roller is taken out salt bath furnace;
B. again high speed steel cold roller is inserted in 240 ℃～280 ℃ nitrate furnaces and cooled off 25-35 minute, make high speed steel cold roller be cooled to isothermal temperature, then high speed steel cold roller is taken out nitrate furnace;
C. high speed steel cold rolling roller end was inserted in 800 ℃ of-850 ℃ of salt bath furnaces heating after 5-10 minute, high speed steel cold rolling roller end is taken out salt bath furnace;
D. again high speed steel cold roller was inserted in 240 ℃～280 ℃ nitrate furnaces isothermal 20-40 minute, take out nitrate furnace;
E. high speed steel cold roller is cooled to 50 ℃～80 ℃ in air;
F. high speed steel cold roller being inserted 560 ℃～570 ℃ nitrate furnace heating cooled off air from the nitrate furnace taking-up after 60-80 minute;
G. high speed steel cold roller is cooled to-30 ℃～60 ℃ in air;
H. again high speed steel cold roller is inserted 560 ℃～570 ℃ nitrate furnace heating after and take out from nitrate furnace after 60-80 minute, in air, be cooled to-30 ℃～60 ℃ then, like this step f and step g are repeated twice again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100128551A CN100427616C (en) | 2006-06-15 | 2006-06-15 | Heat treatment method of high speed steel cold rolling roller end |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100128551A CN100427616C (en) | 2006-06-15 | 2006-06-15 | Heat treatment method of high speed steel cold rolling roller end |
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| Publication Number | Publication Date |
|---|---|
| CN1861812A true CN1861812A (en) | 2006-11-15 |
| CN100427616C CN100427616C (en) | 2008-10-22 |
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|---|---|---|---|
| CNB2006100128551A Expired - Fee Related CN100427616C (en) | 2006-06-15 | 2006-06-15 | Heat treatment method of high speed steel cold rolling roller end |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100455378C (en) * | 2006-12-21 | 2009-01-28 | 安徽省安工机械制造有限公司 | Method for manufacturing high chromium white wear-resistant cast iron |
| CN103849748A (en) * | 2012-11-28 | 2014-06-11 | 大连圣特金属新材料研发有限公司 | Heat treatment method of high speed steel tool used for military |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1211626A (en) * | 1997-09-18 | 1999-03-24 | 杨平生 | Quench hardening technique and device for cold-rolling roll |
| JP2000017341A (en) * | 1998-07-02 | 2000-01-18 | Nippon Steel Corp | Method for quenching work roll for cold rolling |
-
2006
- 2006-06-15 CN CNB2006100128551A patent/CN100427616C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100455378C (en) * | 2006-12-21 | 2009-01-28 | 安徽省安工机械制造有限公司 | Method for manufacturing high chromium white wear-resistant cast iron |
| CN103849748A (en) * | 2012-11-28 | 2014-06-11 | 大连圣特金属新材料研发有限公司 | Heat treatment method of high speed steel tool used for military |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100427616C (en) | 2008-10-22 |
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Owner name: SHANXI TAIGANG STAINLESS STEEL CO., LTD. Free format text: FORMER OWNER: TAIYUAN IRON AND STEEL (GROUP) CO LTD Effective date: 20070713 |
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Effective date of registration: 20070713 Address after: 030003 No. 2, sharp lawn, Taiyuan City, Shanxi Province Applicant after: Shanxi Taigang Stainless Steel Co., Ltd. Address before: 030003 No. 2, sharp lawn, Taiyuan City, Shanxi Province Applicant before: Taiyuan Iron & Steel (Group) Co., Ltd. |
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Granted publication date: 20081022 Termination date: 20170615 |