CN112695184A - Heat treatment method for working roller of lithium battery pole piece - Google Patents
Heat treatment method for working roller of lithium battery pole piece Download PDFInfo
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- CN112695184A CN112695184A CN202011443045.8A CN202011443045A CN112695184A CN 112695184 A CN112695184 A CN 112695184A CN 202011443045 A CN202011443045 A CN 202011443045A CN 112695184 A CN112695184 A CN 112695184A
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- roller
- quenching
- pole piece
- lithium battery
- treatment
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 23
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 17
- 238000010791 quenching Methods 0.000 claims abstract description 49
- 230000000171 quenching effect Effects 0.000 claims abstract description 49
- 238000005496 tempering Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 230000006698 induction Effects 0.000 claims abstract description 15
- 238000005507 spraying Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 229910000734 martensite Inorganic materials 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 abstract description 3
- 230000014759 maintenance of location Effects 0.000 abstract description 2
- 239000011159 matrix material Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000010080 roll forging Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
- C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/04—Hardening by cooling below 0 degrees Celsius
-
- 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
-
- 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
- C21D2261/00—Machining or cutting being involved
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a heat treatment method of a working roller of a lithium battery pole piece, which comprises the following steps: A. normalizing the roller blank, keeping the temperature for a period of time, and discharging the roller blank from a furnace for air cooling; B. b, carrying out quenching and tempering and semi-finish turning on the roller blank processed in the step A; C. continuous induction quenching treatment: b, adjusting the position of the roller processed in the step B according to the requirement of a quenching process, moving the roller from top to bottom for continuous induction heating quenching, and quenching and cooling the roller in a continuous water spraying manner after moving out of an induction coil; after quenching and heating are finished, continuing spraying water for cooling the roller; D. cryogenic treatment: c, carrying out cryogenic treatment on the roller treated in the step C; E. tempering treatment: d, tempering the roller treated in the step D; F. and finally, processing the working roll to a finished product according to the requirements of a drawing, wherein the matrix strength, the capability of resisting the extrusion deformation of foreign objects, the quenching hardness and the wear resistance of the roll body, the hardness uniformity of the roll body and the roll shape retention capability of the working roll of the lithium battery pole piece are improved.
Description
Technical Field
The invention relates to the technical field of roller manufacturing, in particular to a heat treatment method of a working roller of a lithium battery pole piece.
Background
The pole piece of lithium battery is continuously rolled and compacted by a double-roller machine, in the process, the pole piece coated with particle coatings on two sides is fed into a gap between two rollers, the coatings are compacted under the action of the load of the roller line, all parts of the pole piece are uniform, and the thickness difference is within several micrometers. Therefore, the roller is required to have extremely high hardness, extremely high hardness uniformity and high capability of resisting extrusion deformation of foreign objects. In the actual production process, slight indentation is left on the surface of the roller when the roller continuously rolls and extrudes, particularly when the positive pole piece is continuously extruded by coating particles, and the roller must be replaced when the indentation seriously affects the quality of the pole piece to a certain degree. The roller changing and grinding are very complicated, the cost is higher, and the production efficiency of the rolling mill is directly reduced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a heat treatment method of a working roll of a lithium battery pole piece, which can improve the strength and the hardness uniformity of the working roll body, improve the ability of resisting damage and deformation of foreign objects, solve the problem of prolonging the on-machine retention time of the flatness of the roll surface, and improve the quality of rolled materials and the production efficiency of a rolling mill.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a heat treatment method for a working roller of a lithium battery pole piece comprises the following steps:
A. normalizing the roller blank, keeping the temperature for a period of time, and discharging the roller blank from a furnace for air cooling;
B. b, carrying out quenching and tempering and semi-finish turning on the roller blank processed in the step A;
C. continuous induction quenching treatment: b, adjusting the position of the roller processed in the step B according to the requirement of a quenching process, moving the roller from top to bottom for continuous induction heating quenching, and quenching and cooling the roller in a continuous water spraying manner after moving out of an induction coil; after quenching and heating are finished, continuing spraying water for cooling the roller;
D. cryogenic treatment: c, carrying out cryogenic treatment on the roller treated in the step C;
E. tempering treatment: d, tempering the roller treated in the step D;
F. and finally, processing the blank according to the requirements of a drawing to obtain a finished product.
The technical scheme of the invention is further improved as follows: and in the step A, the normalizing temperature range is 900-980 ℃, and the heat preservation time range is 40-80 h.
The technical scheme of the invention is further improved as follows: and C, the quenching temperature range in the step C is 900-980 ℃.
The technical scheme of the invention is further improved as follows: and D, adopting liquid nitrogen cryogenic treatment in the cryogenic treatment mode in the step D, wherein the temperature range of the liquid nitrogen cryogenic treatment is-120 to-180 ℃.
The technical scheme of the invention is further improved as follows: the hardness range of the roller subjected to deep cooling treatment in the step D is as follows: HSD is more than or equal to 98 and less than or equal to 101, hardness uniformity HSD is less than or equal to 2, and martensite structure is more than or equal to 1 grade and less than or equal to 2.5 grade.
The technical scheme of the invention is further improved as follows: and E, tempering at a temperature of 80-150 ℃.
Due to the adoption of the technical scheme, the invention has the technical progress that:
1. according to the invention, the normalizing treatment is added during the preliminary heat treatment, the normalizing temperature range is 900-980 ℃, the heat preservation time range is 40-80 h, the grain size of the roller blank after the normalizing treatment is finer, the carbide particles are finer and distributed more dispersedly, and the uniformity of components and tissues is better; the quenching temperature range is controlled to be 900-980 ℃, the quenching hardness of the roller is improved by increasing the quenching temperature, so that the uniformity of the hardness and the performance of the roller surface and the good capability of resisting the extrusion deformation of foreign objects are improved;
2. the invention carries out liquid nitrogen subzero treatment on the roller after quenching treatment, the subzero treatment temperature range is-120 to-180 ℃, more austenite is converted into martensite, the quenching hardness is higher, the uniformity of the surface hardness and the performance of the roller is better, and the hardness range of the roller after subzero treatment is as follows: HSD is more than or equal to 98 and less than or equal to 101, hardness uniformity HSD is less than or equal to 2, and martensite structure is more than or equal to 1 grade and less than or equal to 2.5 grade.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
a heat treatment method for a working roller of a lithium battery pole piece comprises the following steps:
A. normalizing the roller blank, wherein the heating temperature range is 900-980 ℃, the heat preservation time range is 40-80 h, and discharging and air cooling are carried out after heating and heat preservation are finished; (ii) a
B. B, carrying out quenching and tempering and semi-finish turning on the roller blank processed in the step A;
C. continuous induction quenching treatment: b, adjusting the position of the roller processed in the step B according to the requirement of a quenching process, moving the roller from top to bottom to perform continuous induction quenching at the quenching temperature of 900-980 ℃, and quenching and cooling the roller in a continuous water spraying manner after moving out of an induction coil; after quenching and heating are finished, continuing spraying water for cooling the roller;
D. cryogenic treatment: c, performing cryogenic treatment on the roller treated in the step C, wherein liquid nitrogen cryogenic treatment is adopted in a cryogenic treatment mode, and the temperature range of the liquid nitrogen cryogenic treatment is-120 to-180 ℃; the hardness range of the roller after the deep cooling treatment is as follows: HSD is more than or equal to 98 and less than or equal to 101, hardness uniformity HSD is less than or equal to 2, and martensite structure is more than or equal to 1 grade and less than or equal to 2.5 grade;
E. tempering treatment: d, tempering the roller treated in the step D, wherein the tempering temperature range is 80-150 ℃;
F. and finally, processing the blank according to the requirements of a drawing to obtain a finished product.
Example 1
The requirements for the work roll are as follows:
and (3) specification of the roller: phi 800 × 800 × 2027, single weight: 3.5 tons;
the hardness requirement of the roller body is as follows: HSD is more than or equal to 96;
the thickness requirement of the working layer is as follows: not less than 20 mm;
roller material: the 9Cr3Mo forged steel is prepared by adopting electric furnace smelting, ladle refining and electroslag remelting, and a steel ingot is heated and forged according to the process requirements to prepare a roll forging stock.
A heat treatment method for a working roller of a lithium battery pole piece comprises the following steps:
A. normalizing the roller blank, heating at 930 ℃ for 60h, and discharging and air cooling after heating and heat preservation; (ii) a
B. B, carrying out quenching and tempering and semi-finish turning on the roller blank processed in the step A;
C. continuous induction quenching treatment: b, adjusting the position of the roller processed in the step B according to the requirement of a quenching process, moving the roller from top to bottom to perform continuous induction heating quenching, wherein the quenching temperature is 920 ℃, and quenching and cooling the roller in a continuous water spraying mode after moving out of an induction coil; after quenching and heating are finished, continuing spraying water for cooling the roller;
D. cryogenic treatment: c, performing subzero treatment on the roller treated in the step C, wherein liquid nitrogen subzero treatment is adopted in the subzero treatment mode, and the temperature range of the liquid nitrogen subzero treatment is-150 ℃;
E. tempering treatment: d, tempering the roller treated in the step D, wherein the tempering temperature range is 120 ℃;
F. and finally, processing the blank according to the requirements of a drawing to obtain a finished product.
Example 2:
the difference between this example and example 1 is: and C, heating and preserving the heat of the roller for 40 hours in the step A.
Example 3:
the difference between this example and example 1 is: and (4) heating and insulating the roller for 80h in the step A.
Example 4:
the difference between this example and example 1 is: and the quenching temperature of the roller in the step C is 900 ℃.
Example 5:
the difference between this example and example 1 is: the quenching temperature of the roller in the step C is 930 ℃.
Example 6:
the difference between this example and example 1 is: and D, the cryogenic temperature of the roller in the step D is-120 ℃.
Example 7:
the difference between this example and example 1 is: and D, the cryogenic temperature of the roller in the step D is-180 ℃.
Control run 1: the difference between this example and example 1 is: without normalizing treatment, the roll body quenching treatment is carried out at the conventional quenching temperature.
Control run 2:
the difference between this example and example 1 is: the cryogenic treatment of step D is not performed.
Control run 3:
the difference between this example and example 1 is: the quenching temperature in step C was adjusted to 880 ℃.
To illustrate the advantages of the present invention, after the final heat treatment of the products of examples 1 to 7 and comparative tests 1 to 3, a test ring with a radial 60mm depth of the roll body was taken for hardness and residual austenite detection. The results are shown in Table 1.
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Control 1 | Control 2 | Control 3 | |
| Hardness (HSD) | 99 | 99 | 99 | 97 | 98 | 98 | 101 | 96 | 95 | 93 |
| Hardness uniformity (HS) | ≤2 | ≤2 | ≤2 | ≤2 | ≤2 | ≤2 | ≤2 | ≤3 | ≤3 | ≤2 |
| Martensite (grade) | 1.5 | 1.5 | 1.5 | 1 | 2.5 | 1.5 | 1.5 | 3 | 2 | 1 |
It can be seen from table 1 that the lithium battery pole piece working roll prepared in embodiments 1 to 7 of the present invention has better hardness uniformity, and the roll hardness range is as follows: HSD is more than or equal to 98 and less than or equal to 101, hardness uniformity HSD is more than or equal to 2, martensite structure is more than or equal to 1 and less than or equal to 2.5, quenching hardness of the roller processed by adopting a conventional heat treatment process mode is relatively low (HSD is less than or equal to 96), hardness uniformity is relatively poor (HSD is less than or equal to 3), and if the quenching temperature is not within the quenching temperature range of 900-980 ℃, the quenching hardness of the roller is relatively low (HSD is less than or equal to 93).
Claims (6)
1. A heat treatment method of a working roller of a lithium battery pole piece is characterized by comprising the following steps: the method comprises the following steps:
A. normalizing the roller blank, keeping the temperature for a period of time, and discharging the roller blank from a furnace for air cooling;
B. b, carrying out quenching and tempering and semi-finish turning on the roller blank processed in the step A;
C. continuous induction quenching treatment: b, adjusting the position of the roller processed in the step B according to the requirement of a quenching process, moving the roller from top to bottom for continuous induction heating quenching, and quenching and cooling the roller in a continuous water spraying manner after moving out of an induction coil; after quenching and heating are finished, continuing spraying water for cooling the roller;
D. cryogenic treatment: c, carrying out cryogenic treatment on the roller treated in the step C;
E. tempering treatment: d, tempering the roller treated in the step D;
F. and finally, processing the blank according to the requirements of a drawing to obtain a finished product.
2. The heat treatment method of the working roll of the lithium battery pole piece, according to claim 1, is characterized in that: and in the step A, the normalizing temperature range is 900-980 ℃, and the heat preservation time range is 40-80 h.
3. The heat treatment method of the working roll of the lithium battery pole piece, according to claim 1, is characterized in that: and C, the quenching temperature range in the step C is 900-980 ℃.
4. The heat treatment method of the working roll of the lithium battery pole piece, according to claim 1, is characterized in that: and D, adopting liquid nitrogen cryogenic treatment in the cryogenic treatment mode in the step D, wherein the temperature range of the liquid nitrogen cryogenic treatment is-120 to-180 ℃.
5. The heat treatment method for the working roll of the lithium battery pole piece, as recited in claim 4, is characterized in that: the hardness range of the roller subjected to deep cooling treatment in the step D is as follows: HSD is more than or equal to 98 and less than or equal to 101, hardness uniformity HSD is less than or equal to 2, and martensite structure is more than or equal to 1 grade and less than or equal to 2.5 grade.
6. The heat treatment method of the working roll of the lithium battery pole piece, according to claim 1, is characterized in that: and E, tempering at a temperature of 80-150 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011443045.8A CN112695184A (en) | 2020-12-08 | 2020-12-08 | Heat treatment method for working roller of lithium battery pole piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011443045.8A CN112695184A (en) | 2020-12-08 | 2020-12-08 | Heat treatment method for working roller of lithium battery pole piece |
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| Publication Number | Publication Date |
|---|---|
| CN112695184A true CN112695184A (en) | 2021-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011443045.8A Pending CN112695184A (en) | 2020-12-08 | 2020-12-08 | Heat treatment method for working roller of lithium battery pole piece |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959202A (en) * | 2022-04-25 | 2022-08-30 | 中钢集团邢台机械轧辊有限公司 | Heat treatment method of rolling mill supporting roll |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11310825A (en) * | 1998-04-28 | 1999-11-09 | Nippon Steel Corp | Manufacture of work roll for cold rolling |
| CN103397267A (en) * | 2013-07-12 | 2013-11-20 | 中钢集团邢台机械轧辊有限公司 | Cold roll for rolling lithium battery guard plate and manufacturing method thereof |
| CN108103302A (en) * | 2018-01-09 | 2018-06-01 | 常州艾柯轧辊有限公司 | A kind of cold roll whole heat treatment process |
-
2020
- 2020-12-08 CN CN202011443045.8A patent/CN112695184A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11310825A (en) * | 1998-04-28 | 1999-11-09 | Nippon Steel Corp | Manufacture of work roll for cold rolling |
| CN103397267A (en) * | 2013-07-12 | 2013-11-20 | 中钢集团邢台机械轧辊有限公司 | Cold roll for rolling lithium battery guard plate and manufacturing method thereof |
| CN108103302A (en) * | 2018-01-09 | 2018-06-01 | 常州艾柯轧辊有限公司 | A kind of cold roll whole heat treatment process |
Non-Patent Citations (1)
| Title |
|---|
| 康大韬等主编: "《大型锻件材料及热处理》", 30 April 1998, 新世纪印刷厂印刷 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959202A (en) * | 2022-04-25 | 2022-08-30 | 中钢集团邢台机械轧辊有限公司 | Heat treatment method of rolling mill supporting roll |
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Application publication date: 20210423 |