CN109593946B - Method for controlling hardness and hardening layer of intermediate roll body end of HC six-roll mill - Google Patents
Method for controlling hardness and hardening layer of intermediate roll body end of HC six-roll mill Download PDFInfo
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- CN109593946B CN109593946B CN201811630126.1A CN201811630126A CN109593946B CN 109593946 B CN109593946 B CN 109593946B CN 201811630126 A CN201811630126 A CN 201811630126A CN 109593946 B CN109593946 B CN 109593946B
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- quenching
- optimized design
- end part
- roller body
- roll
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
-
- 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
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
- C21D2221/00—Treating localised areas of an article
- C21D2221/01—End parts (e.g. leading, trailing end)
-
- 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
- C21D2221/00—Treating localised areas of an article
- C21D2221/10—Differential treatment of inner with respect to outer regions, e.g. core and periphery, respectively
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geometry (AREA)
- Heat Treatment Of Articles (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The invention discloses a method for controlling hardness of an end part of a middle roller body of an HC six-roller mill and a hardening layer, which comprises the optimized design of the length allowance of the end part of the roller body before quenching and the optimized design of a quenching critical position; the optimized design of the quenching critical position comprises the optimized design of a quenching heating initial position, the optimized design of a quenching water spraying end position and the optimized design of a power-off continuous cooling position. According to the invention, through the optimized design of the length allowance of the end part of the roll body before quenching of the intermediate roll of the HC six-roll mill and the quenching critical position, the cooling strength of the end part of the roll body of a finished product can be increased, the depth of a hardening layer is improved, no hardness steep drop zone is finally ensured when the product is processed to the end of the finished product, and meanwhile, the failure of quenching shoulder drop or ring crack and the like caused by the sharp corner effect of the end part of the roll body during quenching can be avoided, so that the failure problems of ring crack, peeling and the like of the end part and the like caused by the contact fatigue stress borne by the intermediate roll in the use process.
Description
Technical Field
The invention belongs to the technical field of intermediate rolls of HC six-roll mills, and particularly relates to a method for controlling hardness and hardening layer of an end part of an intermediate roll body of an HC six-roll mill.
Background
The HC six-roller mill mainly realizes the control of the plate shape by the modes of a working roller bending roller/middle roller transverse shifting roller, a working roller bending roller, a middle roller bending roller and the like. The roll bending and shifting technology can well solve the problem of plate shape quality control, but the requirement on the comprehensive performance of the roll is high.
Because the contact stress distribution state between the roller systems is always in a dynamic process, and the hardness of the middle roller is lower than that of the working roller, the high-hardness working roller can bear the extrusion of the high-hardness working roller in the rolling process to generate contact fatigue and stress concentration. The edge of the intermediate roll body is subjected to high contact stress, which can lead to the end of the intermediate roll body peeling or ring cracking. The intermediate roll is peeled off or cracked in a ring manner too early, which not only easily causes rolling accidents, but also causes the intermediate roll to be directly scrapped, and has adverse effects on safety and economy.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for controlling hardness and a hardened layer of an end portion of an intermediate roll body of an HC six-high rolling mill, which can avoid stress concentration between roll systems.
The technical scheme for realizing the purpose of the invention is as follows: a method for controlling hardness and a hardening layer of an intermediate roll body end part of an HC six-roll mill comprises the optimized design of the length allowance of the intermediate roll body end part before quenching and the optimized design of a quenching critical position; the optimized design of the quenching critical position comprises the optimized design of a quenching heating initial position, the optimized design of a quenching water spraying termination position and the optimized design of a power-off continuous cooling position.
The optimized design of the length allowance of the end part of the roller body before quenching is to increase the length allowance of the two ends of the roller body by 30-70 mm respectively.
The quenching and heating initial position is optimally designed to be + 30-70 mm of the chamfer angle position of the end part of the roller body.
The quenching water spraying initial position is optimally designed to be that the roller body extends into the water spraying ring by 30-50 mm.
The quenching water spraying end position is optimally designed to be 30-70 mm away from the chamfer angle position of the end part of the roller body; preferably, the distance between the quenching water spray end position and the roll body end chamfering position = the length margin of the increase of the two ends of the roll body.
And the power-off continuous cooling position is optimally designed to be that the ending end sinks quickly.
Through the optimized design, especially the optimized design of the length allowance of the end part of the roller body before quenching and the quenching water spraying end position (which is equivalent to the condition that the quenching water spraying end position is consistent with the position of a finished product processing contour line), the cooling strength of the end part of the roller body of the finished product can be increased, the depth of a hardening layer is improved, a hardness abrupt reduction area is not formed when the product is processed to the end part of the finished product, and meanwhile, the failure of quenching shoulder falling or ring crack and the like caused by the sharp corner effect of the end part of the roller body during quenching can be avoided.
The heat treatment process related in the control method is a conventional heat treatment process of the intermediate roll of the HC six-roll mill, and mainly comprises preheating treatment, quenching heating and tempering treatment.
The preheating treatment is to preheat in an oven at 300 ℃ for more than 30h and then to turn to a double-frequency quenching machine tool.
Quenching and heating adopt power frequency and intermediate frequency; the power frequency heating power is 200kW, and the power frequency outlet temperature is 1000 +/-10 ℃; the medium-frequency heating power is 30kW, and the medium-frequency outlet temperature is 1020 +/-5 ℃. The rotating speed of the workpiece is 60r/min, and the running speed is 0.5 mm/s; the power-off continuous cooling time is phi D multiplied by 0.2 (unit min), and phi D is the diameter (unit mm) of the intermediate roll.
The tempering temperature was 450 ℃ and the tempering time was φ D × 0.08 (unit h), φ D is the intermediate roll diameter (unit mm).
The invention has the following positive effects: according to the invention, through the optimized design of the length allowance of the end part of the roll body before quenching of the intermediate roll of the HC six-roll mill and the quenching critical position, the cooling strength of the end part of the roll body of a finished product can be increased, the depth of a hardening layer is improved, no hardness steep drop zone is finally ensured when the product is processed to the end of the finished product, and meanwhile, the failure of quenching shoulder drop or ring crack and the like caused by the sharp corner effect of the end part of the roll body during quenching can be avoided, so that the failure problems of ring crack, peeling and the like of the end part and the like caused by the contact fatigue stress borne by the intermediate roll in the use process.
Detailed Description
(example 1)
The method for controlling the hardness and the hardening layer of the end part of the intermediate roll body of the HC six-roll mill comprises the following steps:
s1: and optimally designing the length allowance of the end part of the roller body before quenching.
Specifically, the length margins of the two ends of the roller body are respectively increased by 50 mm.
S2: and (6) preheating treatment.
Preheating for more than 30h in an oven at 300 ℃, and then turning to a double-frequency quenching machine tool.
S3: and (5) quenching treatment.
S31: and (4) optimally designing the quenching heating initial position.
Particularly, the quenching heating initial position is optimally designed to be +50mm of the chamfer angle position of the end part of the roller body.
S32: and (6) quenching and heating.
The power frequency heating power is 200kW, and the power frequency outlet temperature is 1000 +/-10 ℃.
The medium-frequency heating power is 30kW, and the medium-frequency outlet temperature is 1020 +/-5 ℃.
The rotating speed of the workpiece is 60r/min, and the line speed is 0.5 mm/s.
S33: and optimally designing the initial position of quenching water spraying.
Particularly, the quenching water spraying initial position is optimally designed to be 40mm of a roller body extending into a water spraying ring.
S34: and optimally designing the quenching water spray end position.
Particularly, the quenching water spraying end position is optimally designed to be 50mm away from the chamfer angle position of the end part of the roller body.
S35: and (5) power failure and continuous cooling.
And optimally designing the power failure continuous cooling position as that the ending end quickly sinks.
The power-off continuous cooling time is phi D multiplied by 0.2 (unit min), and phi D is the diameter (unit mm) of the intermediate roll.
S4: and (6) tempering.
The tempering temperature is 450 ℃ and the tempering time is phi D multiplied by 0.08 (unit h), phi D being the diameter of the intermediate roll (unit mm).
(application example)
Two batches of HC six-high mill intermediate rolls (roll number: RBM064-496-02, see tables 1 and 2, respectively) of the company are respectively subjected to quenching treatment control by adopting the method of example 1, and the results are respectively shown in tables 1 and 2.
The technical requirements are as follows: the depth of the hardening layer is required to be more than or equal to 40mm, and the hardness is required to be 78-83 HSD.
TABLE 1
TABLE 2
Claims (2)
1. A method for controlling hardness and hardening layer of the end part of a middle roller body of an HC six-roller mill is characterized by comprising the following steps: the method comprises the optimized design of the length allowance of the end part of the roll body before quenching and the optimized design of the quenching critical position; the optimized design of the quenching critical position comprises the optimized design of a quenching heating initial position, the optimized design of a quenching water spraying termination position and the optimized design of a power-off continuous cooling position;
the optimized design of the length allowance of the end part of the roller body before quenching is specifically to increase the length allowance of the two ends of the roller body by 30-70 mm respectively;
the quenching heating initial position is optimally designed to be the chamfer angle position + 30-70 mm at the end part of the roller body;
the quenching water spraying initial position is optimally designed to be that the roller body extends into the water spraying ring by 30-50 mm;
the quenching water spraying end position is optimally designed to be 30-70 mm away from the chamfer angle position of the end part of the roller body;
and the power-off continuous cooling position is optimally designed to be that the ending end sinks quickly.
2. The method for controlling hardness and hardening layer of intermediate roll body end of HC six-high rolling mill according to claim 1, wherein: the distance between the quenching water spray end position and the chamfering position of the end part of the roller body is equal to the length allowance increased at the two ends of the roller body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811630126.1A CN109593946B (en) | 2018-12-29 | 2018-12-29 | Method for controlling hardness and hardening layer of intermediate roll body end of HC six-roll mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811630126.1A CN109593946B (en) | 2018-12-29 | 2018-12-29 | Method for controlling hardness and hardening layer of intermediate roll body end of HC six-roll mill |
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| Publication Number | Publication Date |
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| CN109593946A CN109593946A (en) | 2019-04-09 |
| CN109593946B true CN109593946B (en) | 2020-06-16 |
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| CN201811630126.1A Active CN109593946B (en) | 2018-12-29 | 2018-12-29 | Method for controlling hardness and hardening layer of intermediate roll body end of HC six-roll mill |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS523521A (en) * | 1975-06-27 | 1977-01-12 | Hitachi Ltd | Heat treating method of rolls for rolling mill |
| 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 |
| KR20110113461A (en) * | 2010-04-09 | 2011-10-17 | 주식회사 포스코 | Method for manufacturing scalebreaker roll |
| CN102766753A (en) * | 2012-08-08 | 2012-11-07 | 耿震宇 | Forged steel cold roll induction quenching cooling method |
-
2018
- 2018-12-29 CN CN201811630126.1A patent/CN109593946B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS523521A (en) * | 1975-06-27 | 1977-01-12 | Hitachi Ltd | Heat treating method of rolls for rolling mill |
| 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 |
| KR20110113461A (en) * | 2010-04-09 | 2011-10-17 | 주식회사 포스코 | Method for manufacturing scalebreaker roll |
| CN102766753A (en) * | 2012-08-08 | 2012-11-07 | 耿震宇 | Forged steel cold roll induction quenching cooling method |
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