阅读说明：本技术 一种缩小超薄冷轧纯镍带“s”弯的方法 (Method for reducing S-bend of ultrathin cold-rolled pure nickel strip ) 是由 武会宾 徐建勋 于 2021-06-11 设计创作，主要内容包括：本发明属于镍材加工技术领域,具体涉及一种缩小超薄冷轧纯镍带“S”弯的方法,包括以下步骤：将原始热轧板放置在四辊可逆轧机上经3～4道次轧制,获得粗冷轧板；将粗冷轧板装入钟罩光亮退火炉中退火,并冷却至80℃以下出炉进行中冷轧,经6道次轧制,得到中冷轧板；将中冷轧板放入连续光亮退火炉中退火,经4道次半精轧,得到半精轧薄板；将半精轧薄板放入连续光亮退火炉中进行退火,经4道次精轧,得到超薄纯镍带。在粗轧到中冷轧间使用四辊可逆轧机,采用凸弧度辊,在轧制过程中逐道调整边缘和中间的厚度差；在半精轧和精轧过程中使用六辊可逆轧机,利用中间辊液压抽辊,确保轧辊的刚性变形和压力平衡,得到的退火带材平直整齐,板形良好。(The invention belongs to the technical field of nickel material processing, and particularly relates to a method for reducing S bend of an ultrathin cold-rolled pure nickel strip, which comprises the following steps: placing the original hot rolled plate on a four-roller reversible rolling mill, and rolling for 3-4 times to obtain a rough cold rolled plate; placing the rough cold-rolled plate into a bell jar bright annealing furnace for annealing, cooling to the temperature below 80 ℃, discharging from the furnace for medium cold rolling, and performing 6-pass rolling to obtain a medium cold-rolled plate; putting the inter-cooled rolled plate into a continuous bright annealing furnace for annealing, and performing semi-finish rolling for 4 times to obtain a semi-finish rolled sheet; and (3) annealing the semi-finish-rolled sheet in a continuous bright annealing furnace, and performing finish rolling for 4 times to obtain the ultrathin pure nickel strip. A four-roller reversible rolling mill is used between rough rolling and inter-cooling rolling, convex radian rollers are adopted, and the thickness difference between the edge and the middle is adjusted step by step in the rolling process; a six-roller reversible rolling mill is used in the semi-finish rolling and finish rolling processes, a middle roller is used for hydraulic roller drawing, the rigid deformation and the pressure balance of the roller are ensured, and the obtained annealed strip is straight and neat and has good plate shape.)

1. A method for reducing S-bend of an ultrathin cold-rolled pure nickel strip is characterized by comprising the following process steps:

step S1, rough cold rolling: placing an original hot rolled plate on a four-roller reversing mill, adding emulsion, and then rolling for 3-4 times with the rolling reduction of 63% -73% to obtain a rough cold rolled plate with the thickness of 1.5-2.0 mm, wherein convex radian rollers are adopted on the four-roller reversing mill;

step S2, cold rolling: placing the rough cold-rolled sheet obtained in the step S1 into a bell jar bright annealing furnace for annealing, setting the temperature in the furnace to be 620-680 ℃, keeping the temperature for 8-10 h, after the heat preservation is finished, air-cooling to 320-370 ℃, then water-cooling to below 80 ℃, discharging from the furnace for cold rolling, rolling for 6 times, and obtaining an inter-cold-rolled sheet with the thickness of 0.35-0.60 mm, wherein the reduction is 70% -77%;

step S3, semi-finish rolling: putting the inter-cold rolled plate obtained in the step S2 into a continuous bright annealing furnace for annealing, wherein the annealing temperature is 830-870 ℃, and the inter-cold rolled plate is subjected to 4-pass semi-finish rolling, and the reduction is 65% -67%, so that a semi-finish rolled sheet with the thickness of 0.12-0.2 mm is obtained;

step S4, finish rolling: and (4) annealing the semi-finish-rolled sheet obtained in the step (S3) in a continuous bright annealing furnace at the annealing temperature of 830-870 ℃, and performing 4-pass finish rolling with the reduction of 41-50% to obtain the finished ultrathin pure nickel strip with the thickness of 0.07-0.10 mm.

2. The method for reducing the S-bend of the ultrathin cold-rolled pure nickel strip as claimed in claim 1, wherein the four-high reversible rolling mill is provided with an upper supporting roll, an upper working roll (1), a lower working roll (3) and a lower supporting roll in sequence from top to bottom in step S1, wherein the upper working roll (1) is a convex camber roll.

3. The method for reducing the S-bend of the ultrathin cold-rolled pure nickel strip as claimed in claim 1 or 2, wherein the middle part of the convex arc roller protrudes outwards, and the arc value of the protrusion is 0.08-0.10% of the diameter of the working roller.

4. The method for reducing the S-bend of the ultrathin cold-rolled pure nickel strip is characterized in that the upper working roll (1) or/and the lower working roll (3) is assembled by a roll system assembly, and a connecting transmission shaft or a non-connecting transmission shaft structure is adopted.

5. The method for reducing the S-bend of the ultrathin cold-rolled pure nickel strip as claimed in claim 1, wherein hydrogen is introduced into the continuous bright annealing furnace in steps S3 and S4, and the flow rate of the hydrogen is controlled to be 4-6 m³/h。

6. The method for reducing the S-bend of the ultrathin cold-rolled pure nickel strip as claimed in claim 1, wherein the cold-rolled pure nickel strip (2) is connected with an uncoiling mechanism and a coiling mechanism, and the tension of an S roll is controlled to be 1.2-1.5 tons at a coiling end.

7. The method for reducing the "S" bend of an ultrathin cold-rolled pure nickel strip as claimed in claim 1, wherein the original hot-rolled sheet is a pure nickel N6 hot-rolled slab with a thickness of 5.2-5.8 mm.

8. The method for reducing the "S" bow of the ultra-thin cold-rolled pure nickel strip according to claim 1, wherein the thickness difference between the middle portion and the edge portion of the cold-rolled sheet is controlled by an automatic thickness controller to be 0.1 to 0.15mm in the rough cold-rolled sheet obtained in step S1 and/or the inter-cold-rolled sheet obtained in step S2, and the middle portion is thicker than the edge portion.

Technical Field

The invention belongs to the technical field of nickel material processing, and particularly relates to a method for reducing S-bend of an ultrathin cold-rolled pure nickel strip.

Background

Strip shape control is one of the core control technologies for producing strip material by a cold rolling mill. Common plate shape defects comprise various forms such as waves, sickle S-shaped curves, arcs, unevenness and the like, and are mainly caused by internal stress generated by uneven extension of all parts of a strip material in the rolling process. The ultra-thin pure nickel strap is widely concerned and researched due to the excellent electromagnetic property of the ultra-thin pure nickel strap.

Chinese patent No. CN104998902A discloses a wide pure nickel strip cold rolling process, wherein an annealed pure nickel strip with the thickness of 4-6 mm is rolled by a twenty-roller reversible rolling mill to obtain a pure nickel strip with the thickness of 0.8-2.5 mm, the problems of shape such as S bending and the like are not mentioned, and the thickness of the pure nickel strip is far greater than that of an ultrathin pure nickel strip. Chinese patent No. CN109420682A discloses a method for controlling the shape of a cold-rolled thin strip, which utilizes the relationship between post-tension stress and extension strain to eliminate the differential plastic extension strain generated by the strip steel along the width direction by adjusting the post-tension distribution of the strip steel in real time, thereby improving the shape defect. And no relevant patent is related to the shape control of the ultrathin pure nickel strip at present.

Disclosure of Invention

The invention aims to provide a method for reducing S-bend of an ultrathin cold-rolled pure nickel strip aiming at the defects in the prior art. The preparation method can reduce the S bend of the ultrathin cold-rolled pure nickel strip in the production process of the nickel strip, and improve the qualification rate of products so as to meet the market demand of the high-purity nickel strip at present.

In order to solve the defects of the prior art, the embodiment of the invention adopts the following technical scheme: a method for reducing S-bend of an ultrathin cold-rolled pure nickel strip is characterized by comprising the following process steps:

step S1, rough cold rolling: placing an original hot rolled plate on a four-roller reversing mill, adding emulsion, and then rolling for 3-4 times with the rolling reduction of 63% -73% to obtain a rough cold rolled plate with the thickness of 1.5-2.0 mm, wherein convex radian rollers are adopted on the four-roller reversing mill;

step S2, cold rolling: placing the rough cold-rolled sheet obtained in the step S1 into a bell jar bright annealing furnace for annealing, setting the temperature in the furnace to be 620-680 ℃, keeping the temperature for 8-10 h, after the heat preservation is finished, air-cooling to 320-370 ℃, then water-cooling to below 80 ℃, discharging from the furnace for cold rolling, rolling for 6 times, and obtaining an inter-cold-rolled sheet with the thickness of 0.35-0.60 mm, wherein the reduction is 70% -77%;

step S3, semi-finish rolling: putting the inter-cold rolled plate obtained in the step S2 into a continuous bright annealing furnace for annealing, wherein the annealing temperature is 830-870 ℃, and the inter-cold rolled plate is subjected to 4-pass semi-finish rolling, and the reduction is 65% -67%, so that a semi-finish rolled sheet with the thickness of 0.12-0.2 mm is obtained;

step S4, finish rolling: and (4) annealing the semi-finish-rolled sheet obtained in the step (S3) in a continuous bright annealing furnace at the annealing temperature of 830-870 ℃, and performing 4-pass finish rolling with the reduction of 41-50% to obtain the finished ultrathin pure nickel strip with the thickness of 0.07-0.10 mm.

Further, in step S1, the four-high reversible rolling mill is provided with an upper support roll, an upper work roll (1), a lower work roll (3) and a lower support roll in sequence from top to bottom, wherein the upper work roll (1) is a convex camber roll.

Furthermore, the middle part of the convex radian roller protrudes outwards, and the protruding radian value is 0.08-0.10% of the diameter of the working roller.

Furthermore, the upper working roll (1) or/and the lower working roll (3) are assembled by a roll system part and adopt a structure of a connecting transmission shaft or a non-connecting transmission shaft.

Further, hydrogen is introduced into the continuous bright annealing furnace in the steps S3 and S4, and the flow rate of the hydrogen is controlled to be 4-6 m³/h。

Further, the cold-rolled pure nickel strip (2) is connected with an uncoiling mechanism and a coiling mechanism, and the tension of an S roller is controlled to be 1.2-1.5 tons by a coiling end.

Further, the original hot rolled plate is a pure nickel N6 hot rolled plate blank with the thickness of 5.2-5.8 mm.

Further, the thickness difference between the middle part and the edge part of the cold-rolled sheet obtained in the step S1 and/or the cold-rolled sheet obtained in the step S2 is controlled by an automatic thickness controller to be 0.1-0.15 mm, and the middle part is thicker than the edge part.

Compared with the prior art, the invention has the following advantages:

the method reduces the S-bend of the cold-rolled pure nickel strip by roll shape design and heat treatment process adjustment, uses a four-roll reversible rolling mill in the process from rough rolling to intermediate cold rolling, wherein the upper working roll adopts a convex radian roll, and gradually adjusts the thickness difference between the middle and the edge of the cold-rolled sheet in the cold rolling process; a six-roller reversible rolling mill is used in the semi-finish rolling and finish rolling processes, and a middle roller is used for hydraulic roller drawing to ensure the rigid deformation and the balance under pressure of the roller; the heat treatment in each pass adopts continuous bright annealing, the tension of an S-shaped roller is controlled at the winding end, and the obtained annealed strip is straight and tidy and has good plate shape.

Drawings

FIG. 1 is a schematic structural diagram of upper and lower work rolls and a cold-rolled pure nickel strip in an embodiment of the present invention.

Description of reference numerals: 1-upper working roll; 2-cold rolling a pure nickel strip; 3-lower working roll.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

A method for reducing S-bend of an ultrathin cold-rolled pure nickel strip comprises the following steps:

step S1, rough cold rolling: placing an N6 pure nickel hot-rolled plate blank with the thickness of 5.5mm on a four-roller reversing mill, wherein an upper supporting roller, an upper working roller 1, a lower working roller 3 and a lower supporting roller are sequentially arranged on the four-roller reversing mill from top to bottom, the upper working roller 1 is a convex arc roller, the lower working roller 3 is a flat roller, adding emulsion (namely metal cutting coolant) and then rolling for 3 times, the reduction is 63.6%, so as to obtain a rough cold-rolled plate with the thickness of 2.0 mm, controlling the thickness of the cold-rolled plate by an automatic thickness controller in the rolling process, wherein the thickness difference between the middle part and the edge of the prepared rough cold-rolled plate is 0.12 mm, and the thickness of the middle part is larger;

step S2, cold rolling: placing the rough cold-rolled sheet into a bell jar bright annealing furnace for annealing, setting the temperature in the furnace to be 650 ℃, keeping the temperature for 9 h, after the heat preservation is finished, air-cooling to below 350 ℃, then water-cooling to below 80 ℃, discharging for medium cold rolling, rolling for 6 times, wherein the reduction is 70%, so as to obtain a medium cold-rolled sheet with the thickness of 0.60mm, controlling the thickness of the cold-rolled sheet by an automatic thickness controller in the rolling process, wherein the thickness difference between the middle part and the edge of the prepared rough cold-rolled sheet is 0.12 mm, and the thickness of the middle part is larger;

step S3, semi-finish rolling: putting the inter-cold rolled plate into a continuous bright annealing furnace for annealing, wherein the annealing temperature is 850 ℃, and the hydrogen flow in the continuous bright annealing furnace is controlled to be 4-6 m³The cold-rolled pure nickel strip is connected with an uncoiling mechanism and a coiling mechanism, the tension of an S roller at a coiling end is controlled to be 1.35 tons, and a semi-finish rolling is carried out for 4 times, wherein the reduction is 66.7 percent, so that a semi-finish rolling sheet with the thickness of 0.2mm is obtained;

step S4, finish rolling: putting the semi-finished sheet into a continuous bright annealing furnace for annealing, wherein the annealing temperature is 850 ℃, and the hydrogen flow in the continuous bright annealing furnace is controlled to be 4-6 m³And h, performing finish rolling for 4 times, wherein the rolling reduction is 50%, so as to obtain a finished product ultrathin pure nickel strip with the thickness of 0.10mm, wherein the surface of the finished product ultrathin pure nickel strip is flat and bright, and the finished product ultrathin pure nickel strip has no obvious defects of wrinkles, S bends and the like.

Example 2

A method for reducing S-bend of an ultrathin cold-rolled pure nickel strip comprises the following steps:

step S1, rough cold rolling: placing an N6 pure nickel hot-rolled plate blank with the thickness of 5.5mm on a four-roller reversing mill, wherein an upper supporting roller, an upper working roller 1, a lower working roller 3 and a lower supporting roller are sequentially arranged on the four-roller reversing mill from top to bottom, the upper working roller 1 is a convex arc roller, the lower working roller 3 is a flat roller, after emulsion is added, rolling is carried out for 4 times, the reduction is 72.7%, a rough cold-rolled plate with the thickness of 1.5 mm is obtained, the thickness of the cold-rolled plate is controlled by an automatic thickness controller in the rolling process, the thickness difference between the middle part and the edge of the prepared rough cold-rolled plate is 0.12 mm, and the thickness of the middle part is larger;

step S2, cold rolling: placing the rough cold-rolled sheet into a bell jar bright annealing furnace for annealing, setting the temperature in the furnace to be 680 ℃, keeping the temperature for 8 h, after the heat preservation is finished, air-cooling to be below 320 ℃, then water-cooling to be below 80 ℃, discharging from the furnace for carrying out cold rolling, carrying out 6-pass rolling, wherein the reduction is 76.7%, obtaining an inter-cold-rolled sheet with the thickness of 0.35 mm, controlling the thickness of the cold-rolled sheet by an automatic thickness controller in the rolling process, and controlling the thickness difference between the middle part and the edge of the prepared rough cold-rolled sheet to be 0.12 mm, wherein the thickness of the middle part is larger;

step S3, semi-finish rolling: annealing the cold rolled plate in a continuous bright annealing furnace, setting the annealing temperature to be 830 ℃, and controlling the hydrogen flow in the continuous bright annealing furnace to be 4-6 m³The cold-rolled pure nickel strip is connected with an uncoiling mechanism and a coiling mechanism, the tension of an S roller at a coiling end is controlled to be 1.2 tons, and a semi-finish rolling sheet with the thickness of 0.12 mm is obtained after 4 times of semi-finish rolling and the reduction of 65.7 percent;

step S4, finish rolling: annealing the semi-finished sheet in a continuous bright annealing furnace at 830 ℃, wherein the hydrogen flow in the continuous bright annealing furnace is controlled to be 4-6 m³And (3) carrying out finish rolling for 4 times, wherein the rolling reduction is 41.7%, so as to obtain a finished product ultrathin pure nickel strip with the thickness of 0.07mm, wherein the surface of the finished product ultrathin pure nickel strip is flat and bright, and the finished product ultrathin pure nickel strip has no obvious defects of wrinkles, S bends and the like.

Example 3

A method for reducing S-bend of an ultrathin cold-rolled pure nickel strip comprises the following steps:

step S1, rough cold rolling: placing an N6 pure nickel hot-rolled plate blank with the thickness of 5.5mm on a four-roller reversing mill, wherein an upper supporting roller, an upper working roller 1, a lower working roller 3 and a lower supporting roller are sequentially arranged on the four-roller reversing mill from top to bottom, the upper working roller 1 is a convex arc roller, the lower working roller 3 is a flat roller, after emulsion is added, rolling is carried out for 4 times, the reduction is 68%, a rough cold-rolled plate with the thickness of 1.8 mm is obtained, the thickness of the cold-rolled plate is controlled by an automatic thickness controller in the rolling process, the thickness difference between the middle part and the edge of the prepared rough cold-rolled plate is 0.15mm, and the thickness of the middle part is larger;

step S2, cold rolling: placing the rough cold-rolled sheet into a bell jar bright annealing furnace for annealing, setting the temperature in the furnace to be 650 ℃, keeping the temperature for 9 h, after the heat preservation is finished, carrying out air cooling to below 370 ℃, then carrying out water cooling to below 80 ℃, discharging and carrying out medium cold rolling, carrying out 6-pass rolling, wherein the reduction is 73%, obtaining a medium cold-rolled sheet with the thickness of 0.50 mm, controlling the thickness of the cold-rolled sheet by an automatic thickness controller in the rolling process, and the thickness difference between the middle part and the edge of the prepared rough cold-rolled sheet is 0.12 mm, wherein the thickness of the middle part is larger;

step S3, semi-finish rolling: putting the inter-cold rolled plate into a continuous bright annealing furnace for annealing, wherein the annealing temperature is set to 870 ℃, and the hydrogen flow in the continuous bright annealing furnace is controlled to be 4-6 m³The cold-rolled pure nickel strip is connected with an uncoiling mechanism and a coiling mechanism, the tension of an S roller at a coiling end is controlled to be 1.5 tons, and a semi-finish rolling sheet with the thickness of 0.12 mm is obtained after 4 times of semi-finish rolling and the reduction is 65%;

step S4, finish rolling: putting the semi-finished sheet into a continuous bright annealing furnace for annealing, wherein the annealing temperature is 870 ℃, and the hydrogen flow in the continuous bright annealing furnace is controlled to be 4-6 m³And (3) carrying out finish rolling for 4 times, wherein the rolling reduction is 45.7%, so as to obtain a finished product ultrathin pure nickel strip with the thickness of 0.07mm, and the finished product ultrathin pure nickel strip has a smooth and bright surface and does not have obvious defects of wrinkles, S bends and the like.

The N6 pure nickel hot-rolled slab in the embodiment of the application comprises the following components in percentage by mass: more than or equal to 99.5 percent of Ni, 0.002-0.01 percent of C, 0.02-0.1 percent of Si, 0.01-0.05 percent of Mn, 0.01-0.03 percent of Mg, 0.01-0.1 percent of Ti, 0.01-0.1 percent of Al, less than or equal to 0.005 percent of S, less than or equal to 0.002 percent of P and 0.01-0.1 percent of Fe.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.