阅读说明：本技术 一种大型电池极片轧机工作辊及其制备方法 (Large-scale battery pole piece rolling mill working roll and preparation method thereof ) 是由 刘娣 杨昱东 王春祥 曹文娟 吉建旭 李立新 孙满臣 刘士峰 任晓光 于 2019-09-25 设计创作，主要内容包括：本发明涉及一种大型电池极片轧机工作辊及其制备方法,极片辊直径750-1200mm,辊面长度800-1500mm,其材质中的成分及重量百分含量为C:0.75-0.90%,Si:0.40-1.00%,Mn:0.40-1.00%,Cr3.00-5.00%,Mo:0.10-0.80%,P≤0.015%,S≤0.015%,V≤0.20%,其余为Fe和不可避免的杂质。制备方法为：①制备辊坯；②辊坯粗车；③预备热处理,冷却后高温回火；④感应淬火加热；⑤回火保温；⑥精加工制得成品辊。采用本方法生产的极片辊,具有良好的工作层组织,较高的内部和工作层探伤合格率,同时各项性能满足使用要求。(The invention relates to a large-scale battery pole piece rolling mill working roll and a preparation method thereof, wherein the diameter of the pole piece rolling mill working roll is 750-0.90 mm, the length of the roll surface is 800-1500mm, the components and the weight percentage of the material are 0.75-0.90% of C, 0.40-1.00% of Si, 0.40-1.00% of Mn, 0.00-5.00% of Cr3, 0.10-0.80% of Mo, less than or equal to 0.015% of P, less than or equal to 0.015% of S, less than or equal to 0.20% of V, and the balance of Fe and inevitable impurities.)

1. The utility model provides a large-scale battery pole piece rolling mill work roll which characterized in that: the pole piece roller comprises the following chemical components in percentage by weight: c:0.75-0.90%, Si:0.40-1.00%, Mn:0.40-1.00%, Cr: 3.00-5.00%, Mo:0.10 to 0.80 percent of Fe, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.20 percent of V, and the balance of Fe and inevitable impurities.

2. The large battery pole piece rolling mill work roll of claim 1, wherein: the pole piece roller comprises the following chemical components in percentage by weight: c: 0.80-0.85%, Si: 0.50-0.95%, Mn: 0.62-0.850%, Cr: 3.80-4.60%, Mo: 0.25 to 0.750 percent, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.18 percent of V, and the balance of Fe and inevitable impurities.

3. The large battery pole piece rolling mill work roll of claim 1, wherein: the diameter of the pole piece roller is 750-1200mm, and the length of the roller surface is 800-1500 mm.

4. A preparation method of a large-scale battery pole piece rolling mill working roll according to any one of claims 1 to 3, characterized by comprising the following steps: the preparation method of the pole piece roller comprises the following steps:

step 1: preparing a roller blank by a conventional production process according to the chemical components and the weight percentage of the pole piece roller;

step 2: roughly turning the roller blank;

and step 3: performing preliminary heat treatment, wherein the heating temperature is 870-970 ℃, and after cooling, performing high-temperature tempering at 600-700 ℃;

and 4, step 4: induction quenching heat treatment, wherein the heating temperature is 880-980 ℃;

and 5: tempering, wherein the heat preservation temperature is 80-180 ℃;

step 6: and finishing to obtain the finished roller.

5. The method for preparing the working roll of the large-scale battery pole piece rolling mill according to claim 4, wherein the method comprises the following steps: in the step 3, the heating temperature is 870-970 ℃, and the heat preservation time is 30-50 hours.

6. The method for preparing the working roll of the large-scale battery pole piece rolling mill according to claim 4, wherein the method comprises the following steps: the cooling mode in the step 3 is water cooling.

7. The method for preparing the working roll of the large-scale battery pole piece rolling mill according to claim 4, wherein the method comprises the following steps: and the cooling mode in the step 3 is air cooling.

8. The method for preparing the working roll of the large-scale battery pole piece rolling mill according to claim 4, wherein the method comprises the following steps: and 3, tempering at the high temperature of 600-700 ℃ in the step 3, and keeping the temperature for 30-40 hours.

9. The method for preparing the working roll of the large-scale battery pole piece rolling mill according to claim 4, wherein the method comprises the following steps: and 5, tempering treatment, wherein the heat preservation temperature is 80-180 ℃, and the heat preservation time is 80-150 h.

10. The preparation method of the working roll of the large-scale battery pole piece rolling mill according to any one of claims 5 to 9, characterized by comprising the following steps: the surface hardness of the prepared finished roller is 66-68HRC, the uniformity is less than or equal to +/-0.5 HRC, the roughness reaches Ra0.2, the roundness reaches 0.002, the cylindricity reaches 0.002, the straightness reaches 0.002, the tolerance of a roller neck is 0.01-0.02 mm, and the paired pole piece roller has no light transmission.

Technical Field

The invention relates to the technical field of materials and heat treatment, in particular to a large-scale battery pole piece rolling mill working roll and a preparation method thereof.

Background

The working roll of the battery pole piece rolling mill is an important part on the battery pole piece rolling mill, in recent years, with the vigorous advocation and popularization of new energy policies of green, environmental protection, energy conservation and emission reduction in China, with the rapid development of electric vehicles and electric automobiles, the yield of new energy lithium batteries serving as high and new technology industries in China is greatly improved, and a large production scale of the battery pole piece rolling mill is formed in regions such as Guangdong, Hebei, Hunan and the like in China at present.

The new energy lithium battery has the advantages that the demand is greatly improved, the output of the battery pole piece rolling mill and the pole piece roller is improved, the product structure is adjusted quickly, and the quality requirement is higher and higher. The hardness of the original battery pole piece roller with small specification below phi 600mm is required to be low, the roller body diameter is gradually developed to 1200mm from 750 plus 800mm along with the continuous development of the rolling mill design to wide width, high hardness and high quality, the roller body length is also gradually increased to 1050mm from 500mm, the roller body hardness is improved to HRC66-68 from HRC64-66, the hardness uniformity is less than or equal to +/-0.5 HRC, higher requirements are provided for the roller surface, the roughness reaches Ra0.2, the precision requirement roundness is 0.002, the cylindricity is 0.002 and the straightness reaches 0.002, the tolerance of the roller neck is 0.01-0.02 mm, and the paired pole piece roller can achieve no light transmission to the gap.

Therefore, the battery pole piece rolling mill is developing towards the direction of large diameter, wide breadth and high precision, and in order to meet the development requirements of the battery pole piece rolling mill and improve the market competitiveness, the research and development of working rolls of large-scale battery pole piece rolling mills are imperative.

Disclosure of Invention

The invention aims to overcome the problems and provides a large-scale battery pole piece rolling mill working roll and a preparation method thereof, in particular to a material and a heat treatment process of a pole piece roll.

In order to meet the performance requirements, the technical scheme adopted by the invention is as follows:

a large-scale battery pole piece rolling mill working roll comprises the following chemical components in percentage by weight: c:0.75-0.90%, Si:0.40-1.00%, Mn:0.40-1.00%, Cr: 3.00-5.00%, Mo:0.10-0.80 percent, and less than or equal to 0.015 percent of P; s is less than or equal to 0.015 percent, and V is less than or equal to 0.20 percent; the balance of Fe and inevitable impurities.

The technical scheme of the invention is further improved as follows: the pole piece roller comprises the following chemical components in percentage by weight: c: 0.80-0.85%, Si: 0.50-0.95%, Mn: 0.62-0.850%, Cr: 3.80-4.60%, Mo: 0.25 to 0.750 percent, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.18 percent of V, and the balance of Fe and inevitable impurities.

The technical scheme of the invention is further improved as follows: the diameter of the pole piece roller is 750-1200mm, and the length of the roller surface is 800-1500 mm.

The technical scheme of the invention is further improved as follows: a preparation method of a large-scale battery pole piece rolling mill working roll is carried out according to the following steps:

step 1: preparing a roller blank by a conventional production process according to the chemical components and the weight percentage of the pole piece roller;

step 2: roughly turning the roller blank;

and step 3: performing preliminary heat treatment, wherein the heating temperature is 870-970 ℃, and after cooling, performing high-temperature tempering at 600-700 ℃;

and 4, step 4: induction quenching heat treatment, wherein the heating temperature is 880-980 ℃;

and 5: tempering, wherein the heat preservation temperature is 80-180 ℃;

step 6: and finishing to obtain the finished roller.

The technical scheme of the invention is further improved as follows: in the step 3, the mixture is heated to 870-970 ℃ and the heat preservation time is 30-50 hours.

The technical scheme of the invention is further improved as follows: the cooling mode in the step 3 is water cooling.

The technical scheme of the invention is further improved as follows: and the cooling mode in the step 3 is air cooling.

The technical scheme of the invention is further improved as follows: and 3, tempering at the high temperature of 600-700 ℃ in the step 3, and keeping the temperature for 30-40 hours.

The technical scheme of the invention is further improved as follows: and 5, tempering treatment, wherein the heat preservation temperature is 80-180 ℃, and the heat preservation time is 80-150 h.

The technical scheme of the invention is further improved as follows: according to the preparation method of the working roll of the large-scale battery pole piece rolling mill, the surface hardness of the prepared finished roll is 66-68HRC, the uniformity is less than or equal to +/-0.5 HRC, the roughness reaches Ra0.2, the roundness reaches 0.002, the cylindricity reaches 0.002, the straightness reaches 0.002, the tolerance of a roll neck is 0.01-0.02 mm, and the butt joint of the matched pole piece roll can achieve no light transmission.

Due to the adoption of the technical scheme, the invention has the following technical effects:

1. the invention not only optimizes the chemical component proportion but also reduces certain production cost on the whole by canceling the Ni element and adjusting the contents of Si, Mn and Mo elements.

2. The invention can further refine the structure and improve the material performance by reducing the content of P and S elements.

3. According to the invention, by reducing the content of the V element, the structure crystal material can be further refined, and the strength and toughness of the material are improved.

4. By carrying out the heat treatment method on the material, the invention not only reduces certain production cost, but also improves material performance, so that the surface hardness of the prepared finished roller is 66-68HRC, the uniformity is less than or equal to +/-0.5 HRC, the roughness reaches Ra0.2, the roundness reaches 0.002, the cylindricity reaches 0.002, the straightness reaches 0.002, the tolerance of the roller neck is 0.01-0.02 mm, the butt joint of the paired roller reaches no light transmission, and the use requirement is met

5. The large-scale battery pole piece rolling mill working roll obtained by the material and the preparation method has the advantages that the metallographic structure on the surface of the roll body is uniform, the grain size reaches 12 grades, the metallographic structure at the depth of 30mm of the roll body is uniform, the grain size reaches 11 grades, the surface quenching hardness reaches 97HSD, and the use requirements of the pole piece rolling mill on wear resistance, thermal shock, roughness maintenance, hardening layer depth and the like are met.

6. According to the invention, the chemical components and the weight percentage of the material are adjusted, and the heat treatment method is adopted, so that the specification of the conventional pole piece roller is large, the diameter of the conventional pole piece roller is 600mm, and the surface length of the roller is 600 mm; the diameter of the large pole piece roller is 750-1200mm, and the length of the roller surface is 800-1500 mm.

7. The heat treatment method comprises the heat treatment processes of pre-heat treatment and induction quenching and tempering, and can obviously improve the carbide particles and quantity and make the structure uniform through reasonable parameter design; the depth, the wear resistance, the roughness retention capability and the thermal shock performance of the hardening layer can meet the design requirements.

Drawings

FIG. 1 is a metallographic structure of the surface (a) and 30mm depth (b) of a work roll of a large-scale battery pole piece rolling mill according to the present invention;

FIG. 2 is a hardening layer curve of the large-scale battery pole piece rolling mill working roll of the invention.

Detailed Description

The invention relates to a large-scale battery pole piece rolling mill working roll and a preparation method thereof, in particular to a special working roll for rolling a battery pole piece. The invention is realized by reasonably designing the chemical components and the weight percentage of the working roll and reasonably heat treatment process.

A large-scale battery pole piece rolling mill working roll comprises the following chemical components in percentage by weight: c:0.75-0.90%, Si:0.40-1.00%, Mn:0.40-1.00%, Cr: 3.00-5.00%, Mo:0.10-0.80 percent, and less than or equal to 0.015 percent of P; s is less than or equal to 0.015 percent, and V is less than or equal to 0.20 percent; the balance of Fe and inevitable impurities.

The pole piece roller further comprises the following chemical components in percentage by weight: c: 0.80-0.85%, Si: 0.50-0.95%, Mn: 0.62-0.850%, Cr: 3.80-4.60%, Mo: 0.25 to 0.750 percent, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.18 percent of V, and the balance of Fe and inevitable impurities.

A large-scale battery pole piece rolling mill working roll has the diameter of a pole piece roll of 750-1200mm and the length of a roll surface of 800-1500 mm.

A preparation method of a large-scale battery pole piece rolling mill working roll is carried out according to the following steps:

step 1: preparing a roller blank by a conventional production process according to the chemical components and the weight percentage of the pole piece roller;

step 2: roughly turning the roller blank;

and step 3: performing preliminary heat treatment, wherein the heating temperature is 870-970 ℃, the heat preservation time is 30-50 hours, and the high-temperature tempering is performed at 600-700 ℃ after water cooling or air cooling, and the heat preservation time is 30-40 hours;

and 4, step 4: induction quenching heat treatment, wherein the heating temperature is 880-980 ℃;

and 5: tempering, wherein the heat preservation temperature is 80-180 ℃, and the heat preservation time is 80-150 h;

step 6: and finishing to obtain the finished roller.

According to the preparation method of the working roll of the large-scale battery pole piece rolling mill, the surface hardness of the prepared finished roll is 66-68HRC, the uniformity is less than or equal to +/-0.5 HRC, the roughness reaches Ra0.2, the roundness reaches 0.002, the cylindricity reaches 0.002, the straightness reaches 0.002, the tolerance of a roll neck is 0.01-0.02 mm, and the butt joint of the matched pole piece roll can achieve no light transmission.

The present invention will be described in further detail with reference to the following examples: