CN111549205A - Novel heat treatment process for cold rolling transmission roller - Google Patents
Novel heat treatment process for cold rolling transmission roller Download PDFInfo
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- CN111549205A CN111549205A CN202010554822.XA CN202010554822A CN111549205A CN 111549205 A CN111549205 A CN 111549205A CN 202010554822 A CN202010554822 A CN 202010554822A CN 111549205 A CN111549205 A CN 111549205A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to the technical field of heat treatment of cold-rolled transmission rollers, and discloses a novel heat treatment process of a cold-rolled transmission roller, which comprises a workpiece and a transmission side end, wherein the transmission side end is positioned at one end of the workpiece, the workpiece and the transmission side end are subjected to preheating treatment firstly and then are subjected to heating, the heated workpiece is subjected to constant-temperature quenching, the quenched workpiece and the transmission side end are cooled, then low-temperature tempering is carried out, the workpiece and the transmission side end are subjected to heating and preheating after the low-temperature tempering, then high-temperature tempering is carried out for two times, preheating is carried out after the high-temperature tempering and cooling of the cold-rolled. According to the novel heat treatment process for the cold-rolled transmission roller, the residual austempered iron can be converted into martensite, after secondary high-temperature tempering, the residual austempered iron amount is about 8-10%, the residual austempered iron is converted into martensite, the wear resistance and the service life of the cold-rolled transmission roller are effectively improved, the problem that a client generates cracks during rolling is effectively solved, and the service life of the roller is prolonged.
Description
Technical Field
The invention relates to the technical field related to heat treatment of cold-rolled transmission rollers, in particular to a novel heat treatment process of a cold-rolled transmission roller.
Background
The cold rolling driving roller is taken as an important component of a cold rolling mill, steel rolling equipment is continuously updated and rapidly developed along with the progress of a steel rolling technology, although domestic roller enterprises are continuously expanded in yield, the quality of a component equipment structure is not completely kept up with the technical progress of a steel industry, the production capacity of a high-end roller is obviously insufficient, the cold rolling driving roller needs to be subjected to a series of heat treatment processes during production, the comprehensive use performance of the cold rolling driving roller is improved, the surface of the cold rolling driving roller needs to bear larger contact stress, alternating stress and friction force during use, but the existing cold rolling driving roller cannot effectively eliminate the internal stress of a workpiece and reduce the residual austenite content during heat treatment, so that the cold rolling driving roller is easy to generate hot cracking, bending deformation and uneven hardness during long-term use, the service life is shortened, and the requirements of customers cannot be met, therefore, the inventor designs a novel heat treatment process for the cold-rolled driving roller, improves the comprehensive use performance of the cold-rolled driving roller and improves the heat treatment quality of workpieces.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a novel heat treatment process for a cold-rolled transmission roller, and solves the problem that the internal stress and the austenitic content of the cold-rolled transmission roller cannot be effectively eliminated during heat treatment.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a novel heat treatment process for a cold-rolled transmission roller comprises a workpiece and a transmission side end, wherein the transmission side end is located at one end of the workpiece, the workpiece and the transmission side end are subjected to preheating treatment firstly, then are heated, the heated workpiece is quenched at constant temperature, the quenched workpiece and the transmission side end are cooled, then are subjected to low-temperature tempering, are heated and preheated after being subjected to low-temperature tempering, are subjected to high-temperature tempering twice, are preheated after being subjected to high-temperature tempering and cooling, are subjected to high-temperature tempering and cooling independently, and finally are subjected to hardness detection on the whole cold-rolled transmission roller.
Preferably, the workpiece and the transmission side end are integrally forged and formed.
Preferably, hardness of the workpiece and the transmission side end is detected by using a Shore hardness tester, the hardness range of the workpiece and the transmission side end in the post-quenching stage is HRC53-56, and the surface hardness range of the workpiece and the transmission side end after heat treatment is HRC 58-60.
Preferably, the preheating treatment of the workpiece and the transmission side end adopts three or more sections of preheating and heat preservation treatment.
Preferably, the workpiece and the transmission side end are subjected to segmented preheating tempering treatment and secondary tempering treatment during low-temperature tempering.
Preferably, the workpiece and the transmission side end adopt constant temperature quenching or constant temperature liquid quenching.
A novel heat treatment process for a cold rolling transmission roller comprises the following heat treatment processing steps:
s1, carrying out heat treatment on the cold rolling transmission roller by adopting a segmented preheating method, preheating in heating equipment, and sequentially carrying out 400 ℃ preheating → 600 ℃ preheating → 800 ℃ preheating, wherein the 400 ℃ preheating time is 7-10 hours, the 600 ℃ preheating time is 4-6 hours, and the 800 ℃ preheating time is 2-4 hours;
s2, after preheating the cold rolling transmission roller, heating up at 995 and 1140 ℃ by heating equipment for 90-120 min;
s3, after high-temperature heating, air cooling the cold rolling transmission roller to 70-90 ℃, and then placing the cold rolling transmission roller into quenching equipment for constant-temperature quenching treatment, wherein the constant-temperature quenching temperature range is 150-;
s4, leading the cold-rolled driving roller after constant temperature quenching out of the quenching equipment, carrying out air cooling, and carrying out low-temperature tempering when the cooling temperature of the cold-rolled driving roller reaches 70-90 ℃;
s5, firstly carrying out low-temperature tempering at 200 ℃ for 160-plus-one, wherein the time range of the low-temperature tempering treatment at this stage is 8-12h, carrying out preheating treatment at 360 ℃ after the low-temperature tempering, the time range of the preheating treatment is 7-10h, carrying out high-temperature tempering at 550 ℃ for 500-plus-one after the preheating treatment is carried out on the cold-rolled transmission roller, the time range of the high-temperature tempering treatment is 8-12h, then carrying out air cooling, and carrying out secondary high-temperature tempering treatment, wherein the temperature range of the secondary high-temperature tempering treatment is 500-plus-one 550 ℃, and the time range of the high-temperature tempering treatment is 8-12 h;
s6, air cooling the cold rolling driving roller after high temperature tempering to 70-90 ℃, then carrying out preheating treatment on the cold rolling driving roller at 360 ℃ for 7-10h,
s7, after preheating the cold rolling transmission roller, performing single high-temperature tempering on the transmission side end, wherein the high-temperature tempering temperature range is 650-695 ℃, and the high-temperature tempering time range is 5-8 h;
s8, naturally cooling air after the high-temperature tempering of the transmission side end of the cold rolling transmission roller is finished;
and S9, carrying out hardness detection on the cold-rolled driving roller subjected to heat treatment by using a Shore HS (high hardness) tester, wherein the surface hardness range of the cold-rolled driving roller is HRC 58-60.
(III) advantageous effects
The invention provides a novel heat treatment process for a cold rolling transmission roller. The method has the following beneficial effects:
(1) this novel cold rolling driving roller heat treatment process, preheat through carrying out 400 ℃→ 600 ℃ -800 ℃ segmentation to the cold rolling driving roller, the effectual temperature difference that reduces the cold rolling driving roller in each heat treatment stage, keep warm in every heat treatment stage and make work piece inlayer and skin all the same reach the temperature that sets for after up temperature removes again, make the inside and outside of cold rolling driving roller keep the same metallic state, guarantee the uniformity of the interior outer processing of cold rolling driving roller, guarantee work piece heat treatment quality, make work piece intensity and hardness improve significantly.
(2) According to the novel heat treatment process of the cold-rolled transmission roller, the cold-rolled transmission roller is subjected to temperature rise heating at 995-1140 ℃ before constant temperature quenching, so that the cold-rolled transmission roller is different in size, and is hung for air cooling after reaching the same temperature, so that the deformation, bending and even cracking of the roller can be reduced, and the purpose is to ensure that the surface and the core of the roller reach the same temperature.
(3) The novel heat treatment process of the cold rolling transmission roller aims at reducing or even eliminating partial residual austempered iron content so that the residual austempered iron can be converted into martensite iron, after secondary high-temperature tempering, the residual amount of the austempered iron is about 8-10 percent, the residual austempered iron is converted into the martensite, on one hand, the hardness of the martensite can be improved, on the other hand, the deformation of the martensite caused by temperature rise in use can be reduced, the hardness rise after high-temperature tempering is also called secondary hardening, the deformation amount of the cold-rolling driving roller is effectively reduced, the cold-rolling driving roller is prevented from being out of round after being used for a long time, the hardness after heat treatment can reach HRC58-60, the wear resistance and the service life of the cold-rolling driving roller are effectively improved, the problem of cracks generated during client rolling is effectively solved, and the service life of the roller is prolonged.
(4) This novel cold rolling driving roller heat treatment process carries out independent high temperature tempering to the transmission side, and effectual transmission side end part to cold rolling driving roller softens, reduces the hardening degree, and the subsequent flat surface facing of milling of the cold rolling driving roller of being convenient for guarantees the stability of the follow-up processing of cold rolling driving roller.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a diagram of a phi 200 x 2728 cold rolling drive roll inspection table according to the present invention;
FIG. 3 is another diagram of a phi 200 x 2728 cold roll drive of the present invention.
In the figure: 1 workpiece and 2 transmission side end.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides a technical solution: a novel cold rolling transmission roller heat treatment process comprises a workpiece 1 and a transmission side end 2, wherein the transmission side end 2 is positioned at one end of the workpiece 1, the workpiece 1 and the transmission side end 2 are integrally forged and formed, the workpiece 1 and the transmission side end 2 are firstly subjected to preheating treatment, the preheating treatment of the workpiece 1 and the transmission side end 2 adopts three or more sections of preheating and heat preservation treatment, then heating and heating are carried out, the heated workpiece is quenched at constant temperature, the workpiece 1 and the transmission side end 2 both adopt constant temperature quenching or constant temperature liquid quenching, the quenched workpiece 1 and the transmission side end 2 are cooled, then low-temperature tempering is carried out, heating and preheating are carried out after low-temperature tempering, then high-temperature tempering is carried out for two times, the workpiece 1 and the transmission side end 2 are subjected to segmented preheating and secondary tempering treatment during low-temperature tempering, preheating is carried out after high-temperature tempering cooling of a cold rolling transmission roller, and finally, carrying out hardness detection on the whole cold-rolling transmission roller, wherein hardness detection is carried out on the workpiece 1 and the transmission side end 2 by adopting a Shore hardness tester, the hardness range of the workpiece 1 and the transmission side end 2 at the post-quenching stage is HRC53-56, and the surface hardness range of the workpiece 1 and the transmission side end 2 after heat treatment is finished is HRC 58-60.
Example one
As shown in fig. 2-3, the heat treatment process of phi 200 x 2728 cold rolling driving roller is taken as an example:
a novel heat treatment process for a cold rolling transmission roller comprises the following heat treatment processing steps:
s1, carrying out heat treatment on the cold rolling transmission roller by adopting a segmented preheating method, preheating in heating equipment, and sequentially carrying out 400 ℃ preheating → 600 ℃ preheating → 800 ℃ preheating, wherein the 400 ℃ preheating time is 9 hours, the 600 ℃ preheating time is 6 hours, and the 800 ℃ preheating time is 3 hours;
s2, after preheating the cold rolling transmission roller, heating up at 995 and 1140 ℃ by heating equipment for 100 min;
s3, after high-temperature heating, air cooling the cold rolling transmission roller to 70-90 ℃, and then placing the cold rolling transmission roller into quenching equipment for constant-temperature quenching treatment, wherein the constant-temperature quenching temperature range is 150-;
s4, leading the cold-rolled driving roller after constant temperature quenching out of the quenching equipment, carrying out air cooling, and carrying out low-temperature tempering when the cooling temperature of the cold-rolled driving roller reaches 70-90 ℃;
s5, firstly carrying out low-temperature tempering at 200 ℃ in 160-;
s6, air cooling the cold rolling driving roller after high temperature tempering to 70-90 ℃, then carrying out preheating treatment on the cold rolling driving roller at 360 ℃ for 8h,
s7, after the cold rolling transmission roller is preheated, carrying out independent high-temperature tempering on the transmission side end 2, wherein the high-temperature tempering temperature range is 650-695 ℃, and the high-temperature tempering time range is 8 h;
s8, naturally cooling air after the high-temperature tempering of the transmission side end 2 of the cold rolling transmission roller is finished;
and S9, carrying out hardness detection on the cold-rolled driving roller subjected to heat treatment by using a Shore HS (high hardness) tester, wherein the surface hardness range of the cold-rolled driving roller is HRC 58-60.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a reference structure" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a novel cold rolling driving roller heat treatment process, includes work piece and transmission side, and the transmission side is located the one end of work piece, its characterized in that: the method comprises the steps of preheating a workpiece and a transmission side end, heating, quenching at constant temperature after heating, cooling the quenched workpiece and the transmission side end, tempering at low temperature, heating and preheating after low-temperature tempering, tempering at high temperature twice, preheating after high-temperature tempering and cooling of a cold-rolled transmission roller, tempering at high temperature and cooling the transmission side end independently, and finally detecting the hardness of the whole cold-rolled transmission roller.
2. The novel heat treatment process for the cold-rolled transmission roller according to claim 1, is characterized in that: the workpiece and the transmission side end are integrally forged and formed.
3. The novel heat treatment process for the cold-rolled transmission roller according to claim 1, is characterized in that: hardness detection is carried out on the workpiece and the transmission side end by adopting a Shore hardness tester, the hardness range of the workpiece and the transmission side end in the post-quenching stage is HRC53-56, and the surface hardness range of the workpiece and the transmission side end after heat treatment is HRC 58-60.
4. The novel heat treatment process for the cold-rolled transmission roller according to claim 1, is characterized in that: the preheating treatment of the workpiece and the transmission side end adopts three or more sections of preheating and heat preservation treatment.
5. The novel heat treatment process for the cold-rolled transmission roller according to claim 1, is characterized in that: and carrying out sectional preheating tempering treatment and secondary tempering treatment on the workpiece and the transmission side end during low-temperature tempering.
6. The novel heat treatment process for the cold-rolled transmission roller according to claim 1, is characterized in that: and the workpiece and the transmission side end are quenched by constant temperature or constant temperature liquid.
7. The novel cold-rolled transmission roller heat treatment process is characterized by comprising the following heat treatment processing steps of:
s1, carrying out heat treatment on the cold rolling transmission roller by adopting a segmented preheating method, preheating in heating equipment, and sequentially carrying out 400 ℃ preheating → 600 ℃ preheating → 800 ℃ preheating, wherein the 400 ℃ preheating time is 7-10 hours, the 600 ℃ preheating time is 4-6 hours, and the 800 ℃ preheating time is 2-4 hours;
s2, after preheating the cold rolling transmission roller, heating up at 995 and 1140 ℃ by heating equipment for 90-120 min;
s3, after high-temperature heating, air cooling the cold rolling transmission roller to 70-90 ℃, and then placing the cold rolling transmission roller into quenching equipment for constant-temperature quenching treatment, wherein the constant-temperature quenching temperature range is 150-;
s4, leading the cold-rolled driving roller after constant temperature quenching out of the quenching equipment, carrying out air cooling, and carrying out low-temperature tempering when the cooling temperature of the cold-rolled driving roller reaches 70-90 ℃;
s5, firstly carrying out low-temperature tempering at 200 ℃ for 160-plus-one, wherein the time range of the low-temperature tempering treatment at this stage is 8-12h, carrying out preheating treatment at 360 ℃ after the low-temperature tempering, the time range of the preheating treatment is 7-10h, carrying out high-temperature tempering at 550 ℃ for 500-plus-one after the preheating treatment is carried out on the cold-rolled transmission roller, the time range of the high-temperature tempering treatment is 8-12h, then carrying out air cooling, and carrying out secondary high-temperature tempering treatment, wherein the temperature range of the secondary high-temperature tempering treatment is 500-plus-one 550 ℃, and the time range of the high-temperature tempering treatment is 8-12 h;
s6, air cooling the cold rolling driving roller after high temperature tempering to 70-90 ℃, then carrying out preheating treatment on the cold rolling driving roller at 360 ℃ for 7-10h,
s7, after preheating the cold rolling transmission roller, performing single high-temperature tempering on the transmission side end, wherein the high-temperature tempering temperature range is 650-695 ℃, and the high-temperature tempering time range is 5-8 h;
s8, naturally cooling air after the high-temperature tempering of the transmission side end of the cold rolling transmission roller is finished;
and S9, carrying out hardness detection on the cold-rolled driving roller subjected to heat treatment by using a Shore HS (high hardness) tester, wherein the surface hardness range of the cold-rolled driving roller is HRC 58-60.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112981084A (en) * | 2021-02-20 | 2021-06-18 | 无锡亿宝机械设备有限公司 | Heat treatment method of full-hardened working roll |
| CN113005279A (en) * | 2021-02-20 | 2021-06-22 | 无锡亿宝机械设备有限公司 | Processing method of full-hardened intermediate roll |
| CN114622082A (en) * | 2022-03-21 | 2022-06-14 | 无锡亿宝机械设备有限公司 | Efficient heat treatment method for full-hardened No. 1 intermediate roller made of D2 material |
| WO2024010232A1 (en) * | 2022-07-07 | 2024-01-11 | 정상석 | Differential heat treatment method for forming roller |
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| CN111020127A (en) * | 2020-01-08 | 2020-04-17 | 无锡亿宝机械设备有限公司 | Novel heat treatment process for full-hardened cold-rolled working roll |
| CN111136127A (en) * | 2020-01-06 | 2020-05-12 | 无锡亿宝机械设备有限公司 | Tension leveler tension leveling roller and heat treatment process |
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| JPH11310825A (en) * | 1998-04-28 | 1999-11-09 | Nippon Steel Corp | Manufacture of work roll for cold rolling |
| JP2011000603A (en) * | 2009-06-17 | 2011-01-06 | Kobe Steel Ltd | Method of manufacturing forged steel roll for cold rolling |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112981084A (en) * | 2021-02-20 | 2021-06-18 | 无锡亿宝机械设备有限公司 | Heat treatment method of full-hardened working roll |
| CN113005279A (en) * | 2021-02-20 | 2021-06-22 | 无锡亿宝机械设备有限公司 | Processing method of full-hardened intermediate roll |
| CN113005279B (en) * | 2021-02-20 | 2024-04-26 | 无锡亿宝机械设备有限公司 | Processing method of fully hardened intermediate roller |
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| CN114622082A (en) * | 2022-03-21 | 2022-06-14 | 无锡亿宝机械设备有限公司 | Efficient heat treatment method for full-hardened No. 1 intermediate roller made of D2 material |
| WO2024010232A1 (en) * | 2022-07-07 | 2024-01-11 | 정상석 | Differential heat treatment method for forming roller |
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