KR102225061B1 - Manufacturing method of Fe-Ni alloy thin plate and Fe-Ni alloy thin plate - Google Patents

Abstract

It provides a thin Fe-Ni alloy sheet capable of obtaining good flatness with a small amount of trimming, and a method of manufacturing the same. An intermediate cold-rolling process in which a cold-rolled material using an Fe-Ni-based alloy hot-rolled material is cold-rolled to produce an intermediate cold-rolled material having a thickness of 0.4 mm or less, and the intermediate cold-rolled material is cold-rolled to obtain a thickness of 0.2 mm or less. It includes a finish cold rolling process to make a thin plate, and a shape correction process of performing shape correction on the thin plate, and in the finish cold rolling process, a multistage rolling mill having an intermediate roll shift mechanism is used, and between an intermediate roll end and an intermediate cold rolled material end Cold rolling is performed by adjusting the intermediate roll shift amount, which is a parallel distance of 0 to +9 mm, and in the shape correction step, shape correction with an elongation rate of 0.3 to 0.7 is performed. .

Description

Manufacturing method of Fe-Ni alloy thin plate and Fe-Ni alloy thin plate

The present invention relates to, for example, a thin Fe-Ni alloy plate used for a lead frame or a metal mask, and a method of manufacturing the same.

Fe-Ni-based alloy thin plates used for lead frames or metal masks have been studied variously from the prior art in order to improve performance. Although this thin Fe-Ni alloy plate is thinning in order to meet various demands, there is a concern about an increase in the occurrence of shape defects accompanying it. As a typical example of this shape defect, an edge wave formed at both ends of a thin plate in a rolling direction (hereinafter, also referred to as a width direction) is known. The edge wave is a wave shape generated at both ends of the thin plate in the width direction, and is formed when the length of the end portion of the thin plate in the rolling direction is longer than the length in the rolling direction of the central portion of the thin plate. Excessive edge waves cause problems such as bending or meandering of the plate when winding the thin plate, or cause a decrease in the adhesion between the thin plate and the film when the film is adhered to the thin plate.

In order to reduce such edge waves, various studies have been conducted in the past. As a technique for suppressing edge waves, a multistage rolling mill having an intermediate roll shift function is generally known. Patent Document 1 discloses a method of suppressing edge waves by reducing the pressing pressure of the work roll near the side end of the metal band by displacing the end of the intermediate roll near the side end of the metal band or inward from the side end by the intermediate roll shift function. It is described.

In Patent Document 2, a work roll for rolling, characterized in that it has regular irregularities microscopically, and a macroscopic pattern constituted by the irregularities differs in the axial direction of the roll, is used to prevent the generation of edge waves by roll cross rolling. It describes about the cold rolling method to suppress.

Japanese Patent Laid-Open Publication No. Hei 8-010816 Japanese Patent Laid-Open Publication No. Hei 7-256313

In order to obtain a flat thin plate, it is important to suppress the length of the edge wave generated at both ends of the thin plate in the width direction. If the length of the edge wave in the width direction is large, it is necessary to cut (trim) both ends of the thin plate to a certain degree in order to obtain a flat thin plate, resulting in a decrease in yield. The invention of Patent Literature 1 is useful as a method of suppressing edge waves, but since the roll pressure in the central portion in the width direction of the thin plate increases by reducing the roll pressure at the side end portion, the central elongation (formed in the central portion in the width direction of the thin plate) is increased. There is a high possibility of a separate shape defect, such as a waveform). In addition, although the invention of Patent Document 2 is also an invention that can reduce the steepness of the edge waves at both ends, it is necessary to change the tolerance angle and the type of rolls depending on the type of material or shape defect, so productivity decreases. There is a tendency. In addition, there is no description of reducing the length of the edge wave in the width direction.

An object of the present invention is to provide an Fe-Ni-based alloy thin plate capable of obtaining good flatness with a small amount of trimming by controlling the range of edge wave formation, and a method of manufacturing the same.

One embodiment of the present invention is an intermediate cold rolling step of performing cold rolling on a cold rolling material using an Fe-Ni alloy hot rolled material to produce an intermediate cold rolled material having a thickness of 0.4 mm or less,

A finish cold-rolling step of cold-rolling the intermediate cold-rolled material to form a thin plate having a thickness of 0.2 mm or less;

Including a shape correction step of performing shape correction on the thin plate,

In the finish cold rolling process, a multistage rolling mill having an intermediate roll shift mechanism is used, and cold rolling is performed by adjusting the intermediate roll shift amount, which is a parallel distance between the intermediate roll end and the intermediate cold rolled material end, to 0 to +9 mm,

In the shape correction step, it is a method of manufacturing an Fe-Ni-based alloy thin plate, characterized in that shape correction of an elongation rate of 0.3 to 0.7 is performed.

Preferably, the cold rolling rate in the finish cold rolling step is 15 to 50%.

Preferably, the plate width of the thin plate is 500 to 1200 mm.

Another embodiment of the present invention is an Fe-Ni alloy thin plate having a thickness of 0.2 mm or less,

The thin plate has an edge wave at both ends of the thin plate in the rolling right angle direction, wherein the maximum length in the rolling right angle direction is within 10% of the width of the thin plate,

The edge wave is an Fe-Ni-based alloy thin plate that is formed in each of 10 or more at both ends of the thin plate in the rolling direction per 800 mm of the length in the rolling direction of the thin plate.

Preferably, the edge waves having a maximum width exceeding 10% of the width of the thin plate are 3 or less per 800 mm at both ends of the thin plate in the rolling direction.

Preferably, the plate width of the thin plate is 500 to 1200 mm.

(Effects of the Invention)

According to the present invention, by intentionally forming minute edge waves on both ends of a thin plate, it is possible to suppress the occurrence of excessive edge waves or central elongation. Accordingly, it is possible to obtain a thin Fe-Ni alloy sheet having good flatness with a small amount of trimming.

1 is a schematic diagram for explaining the shape of the thin Fe-Ni alloy plate of the present invention. Fig. 1(a) is a top view, and Fig. 1(b) is a perspective view near the end.
2 is a schematic top view for explaining the shape of a thin Fe-Ni alloy plate of a comparative example.
3 is a schematic diagram of a finish rolling mill used in this embodiment.
4 is a graph showing the steepness of the thin plates of Inventive Example 1 and Comparative Example 11.
5 is a graph showing the steepness of the thin plates of Inventive Example 2 and Comparative Examples 12 and 13. FIG.

First, one embodiment will be described with respect to the method of manufacturing the thin Fe-Ni alloy plate of the present invention.

<Composition of hot rolled material>

In this embodiment, for example, in terms of mass%, Ni + Co: 35.0 to 43.0% (however, Co is 0 to 6.0%), Si: 0.5% or less, Mn: 1.0% or less, and the balance is composed of Fe and impurities. It can be applied to hot-rolled materials having. By having the above composition, an Fe-Ni-based alloy thin plate having low thermal expansion property can be obtained.

[Ni+Co: 35.0~43.0% (however, Co is 0~6.0%)]

Ni and Co are preferably adjusted in the range of 35.0 to 43.0% in order to obtain low thermal expansion. In addition, Co does not necessarily need to be added, but since Co has a function of making an Fe-Ni-based alloy high strength, especially in a thin plate thickness that requires severe handling properties, a part of Ni is converted to Co in the range of up to 6.0%. Can be substituted.

[Si: 0.5% or less, Mn: 1.0% or less]

Si and Mn are usually contained in a small amount for the purpose of deoxidation in the Fe-Ni alloy, but when contained excessively, segregation is liable to occur. Therefore, it is preferable that Si is 0.5% or less and Mn is 1.0% or less. In addition, the lower limit of Si and Mn is not particularly limited, but as described above, 0.05% of Si and 0.05% of Mn remain in a small amount because they are added as deoxidation elements.

[The balance is Fe and impurities]

In addition to the above elements, Fe may be substantially used, but impurities that are unavoidable for manufacturing are included. C is an impurity element that needs to be particularly limited. For example, if it is used for etching, the upper limit may be set to 0.05%.

Further, in the case of improving press punchability, a free-machining element such as S may be contained in an amount of 0.020% or less. An element such as B, which seems to improve hot workability, may be contained in an amount of 0.0050% or less.

<Material for cold rolling>

In the present invention, the above-described hot-rolled material can be used as a material for cold-rolling. Since an oxide layer is formed on the hot-rolled material, it is preferable to remove the oxide layer mechanically or chemically, for example. Further, the edge may be trimmed so that defects such as cracking from the edge of the cold rolled material during cold rolling do not occur. Such processing can be performed to obtain a cold rolling material.

Next, the cold rolling process is demonstrated in detail.

<Intermediate cold rolling>

In the intermediate cold rolling process in this embodiment, cold rolling is performed on the cold rolling material to produce an intermediate cold rolled material having a thickness of 0.4 mm or less. When the thickness of the intermediate cold-rolled material exceeds 0.4 mm, the reduction ratio of the finish cold rolling to be described later becomes too high, so that excessive edge waves or central elongation tend to occur in the thin plate after the finish cold rolling. In this intermediate cold rolling step, cold rolling can be performed once or more, and the reduction ratio can also be appropriately set according to the purpose. In order to have a lower cost and to improve mechanical properties, it is preferable to set it as an intermediate cold rolling step in which cold rolling is performed only once with a reduction ratio of 85% or more. The upper limit of the reduction ratio is not particularly determined, but if the reduction ratio exceeds 99%, the upper limit can be set to 99% because there is a possibility that an increase in cost due to an excessive rolling time may be caused. In addition, when setting the reduction ratio to 85% or more, it is preferable to set the thickness of the above-described hot-rolled material to 2 mm or more. In addition, if the hot-rolled material is too thick, the number of passes during the cold-rolling process may increase or it may become difficult to adjust the shape of the Fe-Ni-based alloy during rolling. Therefore, it is recommended that the upper limit of the thickness of the hot-rolled material to be used is 5 mm. desirable.

<Softening annealing>

In the present embodiment, softening annealing may be performed in order to soften the intermediate cold-rolled material obtained by work-hardening in the above-described intermediate cold rolling to remove deformation. Accordingly, in the finish cold rolling described later, it tends to be easy to adjust to the desired sheet thickness. When performing cold rolling a plurality of times in the intermediate cold rolling step, softening annealing may be performed between the cold rolling. In this embodiment, it is preferable to perform softening annealing at a temperature of 800°C or higher in order to obtain the shape of the crystal grains of the thin plate. In addition, if the temperature is too high, there is a possibility that the desired characteristics may not be obtained, so it is preferable to set the upper limit to 1100°C. Further, this softening annealing can be performed by continuously passing an intermediate cold-rolled material through a heating furnace set at a desired temperature. For example, it can be carried out by a method in which an intermediate cold-rolled material is taken out from a rolled state, passed through a heating furnace, and wound in a coil shape.

<Finish cold rolling>

In the manufacturing method of this embodiment, finish cold rolling is performed on the intermediate cold-rolled material after the above-described intermediate cold rolling step or after the above-described softening annealing. A multistage rolling mill having an intermediate roll shift mechanism as shown in Fig. 3 is used as a rolling mill used in the finish cold rolling step, and the intermediate roll shift amount is adjusted to be 0 to +9 mm. By adjusting in this way, it is possible to concentrate the load on the edge of the thin plate so that an edge wave (hereinafter, also referred to as a minute edge wave) having a maximum width direction length of 10% or less of the width of the thin plate can be purposely concentrated and formed at the end of the thin plate. When the intermediate roll shift amount is less than 0 mm (minus value), the length of the edge wave formed on the thin plate in the width direction tends to be excessive, or a wave shape (central elongation) tends to occur at the center portion in the width direction, which is not preferable. When the intermediate roll shift amount exceeds +9 mm, the load applied to the end portion of the thin plate becomes too large, which tends to cause an extreme decrease in the thickness of the end plate or cracking at the end. The upper limit of the more preferable intermediate roll shift amount is +6 mm. In addition, as shown in FIG. 3, the intermediate roll shift amount in this embodiment is the distance D1, the distance between the end portions (tapered ends) Q1 and Q2 of the intermediate roll and the end portions P1 and P2 of the intermediate cold-rolled material 10, as shown in FIG. D2) is shown. When the intermediate roll shift amount is ``+'', it means that the tapered ends (Q1, Q2) of the intermediate roll are located outside the roll axis direction than the ends of the thin plate (P1, P2), and when the intermediate roll shift amount is ``-'', the intermediate roll The tapered ends (Q1, Q2) of the thin plate are located inside the roll axis direction than the ends (P1, P2) of the thin plate (Q1 is located in the left direction in Fig. 3 from P1, or Q2 is located in the left direction in Fig. 3 than P2). To the right).

In the production method of the present embodiment, it is preferable to adjust the rolling front tension at the time of finish cold rolling to 20 to 40 kgf/mm 2 and the rolling load to 80 to 120 tons. Accordingly, there is a tendency that it becomes easier to form the above-described minute edge wave. When the rolling front tension and the rolling load are outside the above ranges, shape defects such as excessive edge waves tend to occur, which is not preferable. In addition, the reduction ratio at the time of finish cold rolling can be set to 50% or less. When it exceeds 50%, a large load is liable to be applied to the central portion in the width direction of the thin plate, so that the central elongation defect tends to be liable to occur. The upper limit of the preferable reduction ratio is 45%, more preferably 40%. In addition, the lower limit of the reduction ratio is not particularly limited, but if the reduction ratio is too small, there is a possibility that a desired fine edge wave cannot be formed, and thus it can be set to 15%. The lower limit of the preferable reduction ratio is 20%. In addition, in finish cold rolling, it is preferable to roll in one pass in order to roll at low cost while suppressing flaws on the surface of the thin plate.

In order to optimally exhibit the rolling form of this embodiment, the thickness after finish cold rolling is set to 0.2 mm or less. Preferably it is 0.15 mm or less. In addition, the lower limit is not particularly limited, but it can be set to 0.02 mm because a change in shape tends to occur when the material is too thin. The Fe-Ni alloy thin plate of the present invention is preferably applied to a wide thin plate, and specifically, it is preferable that the plate width is 500 to 1200 mm. A more preferable lower limit of the plate width is 600 mm, and a more preferable lower limit of the plate width is 700 mm. Moreover, the upper limit of a preferable board width is 1100 mm, More preferably, it is 1000 mm.

<Shape correction process>

In the manufacturing method of this embodiment, shape correction is performed on the thin plate after finish cold rolling. This makes it possible to correct edge waves and central elongation remaining in the thin plate, and to significantly improve the flatness. As an apparatus used for this shape correction, a shape correction apparatus conventionally used, such as a roller leveler or a tension leveler, can be used (a tension leveler is used in this embodiment). Here, the shape correction sets the elongation to 0.3~0.7. If the elongation exceeds 0.7, it is not desirable because new center elongation or edge waves may occur in the sheet. Further, when the elongation is less than 0.3, it is not preferable because there is a possibility that the entire waveform image cannot be corrected. The lower limit of the preferable elongation rate is 0.4, and the upper limit of the preferable elongation rate is 0.6. The Fe-Ni-based thin plate obtained by the production method of the present embodiment can be wound up in a coil shape by a winder and supplied to the next step as a thin plate coil.

The thin plate obtained by the manufacturing method of the present embodiment is suppressed from generation of excessive edge waves and central elongation and has good flatness, and thus can be used without trimming in order to reduce the cost. However, when it is desired to further improve the flatness, it is preferable to trim both ends in the width direction of the thin plate after shape correction. Since the thin plate obtained by the manufacturing method of the present embodiment can remove most of the minute edge waves with less trimming than the conventional one, it is possible to obtain a thin plate having very high flatness (low sharpness). For example, in this embodiment, by trimming both ends of the thin plate after shape correction by 1 to 9% of the width of the thin plate, it is possible to obtain a thin plate with high flatness with a maximum steepness of 0.5% or less while suppressing a decrease in the yield by suppressing the amount of trimming. Do. The lower limit of the more preferable trimming amount is 4%. In addition, when the improvement of the flatness is emphasized, both ends of the thin plate are trimmed by 10 to 20% (more preferably, 10 to 16%) of the width of the thin plate. Accordingly, it becomes possible to make the maximum steepness of the obtained thin plate to 0.3% or less.

Next, an embodiment of the thin Fe-Ni alloy plate of the present invention will be described. Fig. 1 shows a waveform image of a thin plate according to an embodiment of the present invention. Fig. 2 shows a schematic diagram of a thin plate of the present invention of a comparative example (the length L in the rolling direction assumes 800 mm). The Fe-Ni-based alloy thin plate of the present invention (before trimming) manufactured by the above-described manufacturing method is an edge having a maximum length (Wm) of 10% or less of the width of the thin plate at both ends of the sheet in the rolling right angle direction (width direction). It is characterized in that a wave 2 (micro edge wave) is formed, and 10 or more micro edge waves in 800 mm length in the rolling direction of the said thin plate are respectively formed at both ends of the thin plate. In general, when the rolling rate is the same, the amount of edge wave and center elongation is in a trade-off relationship. In this embodiment, by intentionally forming a large number of edge waves (micro edge waves) having a short maximum length in the width direction in a narrow area of the edge of the thin plate, the maximum length in the width direction exceeds 10% of the width of the thin plate (excessive edge wave) or It can inhibit the development of the central kidney. Due to this effect, it is possible to obtain a thin plate having good flatness without requiring large trimming for both ends of the thin plate. The maximum length (Wm) in the width direction of the preferred edge wave is 8% or less of the width of the thin plate. When this minute edge wave is not formed, there is a tendency that excessive edge wave or central elongation tends to be formed. Therefore, in order to obtain a thin plate with good flatness, both ends of the thin plate must be trimmed to remove edge waves, leading to a decrease in yield. Further, the smaller the maximum length in the width direction of the minute edge wave is, the more preferable it is, but since it is difficult for manufacturing to be 0%, 1% of the width of the thin plate may be set as the lower limit. Further, when the maximum lifting height of the minute edge wave of the present embodiment is too large, the maximum length in the width direction of the edge wave tends to increase, and therefore, it is preferable that it is 1.0 mm or less. A more preferable height is 0.7 mm or less. The smaller the value of the lifting height is, the more preferable, but the lower limit of 0 mm may be set to 0.01 mm because of difficulty in manufacturing. This lifting height can be measured by placing a sample on a horizontal surface and using a laser displacement meter (three-dimensional shape measuring device) or the like.

As described above, the number of minute edge waves in the present embodiment is required to form 10 or more at both ends in the width direction in a thin plate having a length of 800 mm. When the number of minute edge waves is less than 10, excessive edge waves such as the maximum length of the edge wave in the width direction exceeding 10% of the width of the thin plate are liable to occur. As the number of fine edge waves increases, the formation of excessive edge waves is suppressed and the flatness of the thin plate tends to improve. Therefore, the preferable lower limit of the number of fine edge waves can be set to 12. The upper limit of the number is not particularly set, but considering the ease of manufacture, the upper limit of the number of edge waves may be set to 30. On the other hand, the excessive edge wave exceeding 10% of the width of the thin plate is preferably three or less at both ends in the width direction of the thin plate. Accordingly, it is possible to further improve the flatness of the thin plate. Here, the number of edge waves in this embodiment can be measured by cutting a thin plate into a length of 800 mm, for example, and placing it on a horizontal surface plate, and using a laser displacement meter (three-dimensional shape measuring device) device. At that time, in this embodiment, as shown in Fig. 1(b), a portion having a convex shape toward the upper surface of the thin plate and having a height of 0.2 mm or more is set as an edge wave, and the number of edge waves 2a is measured (toward the lower surface of the thin plate. The convex edge wave 2b is not measured). In addition to this, edge waves may be measured visually using an existing measuring device such as an optical microscope. In addition, as shown in FIG. 1(a), the width direction maximum length represents the edge wave maximum length Wm in the direction perpendicular|vertical to the plate width from the edge part of a thin plate. The portion indicated by the dotted line in Fig. 1(a) is a portion having a lift of 0.2 mm or more at both ends of the thin plate, and the length in the width direction is referred to as the edge wave maximum length (Wm).

Example

The Fe-Ni alloy having the composition of Table 1 was hot pressed and hot rolled to prepare a hot rolled material having a thickness of 3.0 mm. The above-described hot-rolled material is chemically polished and mechanically polished to remove the oxide layer on the surface of the hot-rolled material, and in trim processing, the cracks during hot-rolling at both ends of the material width direction are removed to prepare a material for cold rolling with a thickness of 1.55 mm. did. In addition, two types of cold rolling material widths of 850 mm and 730 mm were prepared. Next, the above-described cold-rolling material was divided into an example of the present invention and a comparative example, and intermediate cold-rolling, softening annealing, and finish cold-rolling were performed to obtain an Fe-Ni-based alloy thin plate. In the intermediate cold rolling of the present invention example and the comparative example, an intermediate cold-rolled material having a thickness of 0.125 mm was prepared by using the above-described cold rolling material with a rolling reduction ratio of 85% and the number of passes as 10 passes. Thereafter, softening annealing was performed in both the present invention examples and the comparative examples at a temperature of 900°C and a storage holding time of 0.36 minutes to prepare samples of the present invention examples and comparative examples. Samples of Inventive Example No. 1 and Comparative Example No. 11 had a thin plate width of 850 mm, and samples of Inventive Example No. 2 and Comparative Examples No. 12 and No. 13 had a thin plate width of 730 mm. Invention Example No. 1 performs finish cold rolling under conditions of a rolling front tension of 35 kgf/mm 2, a rolling load of 100 to 115 tons, and an intermediate roll shift amount of +5 mm, and Inventive Example 2 is a rolling front tension of 36 kgf/mm 2 and a rolling load. Finish cold rolling was performed under conditions of 80 to 95 tons and intermediate roll shift +2 mm. In Comparative Example No. 11, the intermediate roll shift amount was changed to +10 mm, and the rolling front tension and the rolling load were the same conditions as in Example 1 of the present invention. In Comparative Examples No. 12 and No. 13, the intermediate roll shift amount was set to +10 mm, and the rolling front tension and the rolling load were the same conditions as in Example 2 of the present invention. The reduction ratio at the time of finish cold rolling was 36% for both the present invention examples and the comparative examples, and the number of passes was 1 pass to obtain a thin plate having a thickness of 0.08 mm. Thereafter, shape correction by a tension leveler is performed under the conditions of an elongation of 0.6 and a tension (unit tension) of 60 kgf/mm 2 after finish cold rolling in both of the present invention examples and comparative examples. Heat treatment was not performed after finish cold rolling. For the thin plate after shape correction, the length direction is the rolling direction, and it is cut into 800 mm in length to produce a test piece of 800 mm in length, 850 mm in width or 730 mm in thickness, and 0.08 mm in thickness. Within 10% of the width), the number of excessive edge waves (the maximum length in the width direction exceeds 10% of the width of the thin plate), and the maximum steepness were measured. The number of edge waves at this time was measured with a three-dimensional shape measuring machine, and the steepness was also derived from the lift height in a state where the test piece was placed on a horizontal surface plate using a three-dimensional shape measuring machine. The results are shown in Table 2. In addition, the maximum steepness (total) in Table 2 is the maximum value of the steepness in the entire sheet, and the maximum steepness (excluding 4%) and the maximum steepness (excluding 10%) are the width of the sheet from the end of the sheet. The value of the maximum steepness excluding the steepness to the position of 4% of the sheet and the maximum steepness excluding the steepness from the end of the sheet to the position of 10% of the width of the sheet are shown.

As shown in Table 2 (in Table 2, one end is referred to as an end a and the other end is referred to as an end b), Sample No. 1 of the present invention has an edge wave having a widthwise length of 85 mm (10% of the width of the sheet) or less ( About 15 micro-edge waves) are formed at both ends, and Sample No. 2 of the present invention has about 11 edge waves (micro edge waves) with a width direction length of 73 mm (10% of the width of a thin plate) or less at both ends. It confirmed that it was formed. In Sample No. 1, only one excessive edge wave in which the maximum length in the width direction exceeded 10% of the width of the thin plate was confirmed on the end b side, and in Sample No. 2, only one was confirmed on both ends. The maximum steepness at the end is 0.3% for No. 1 and 0.6% for No. 2, and the value of the steepness excluding the range from the end to the width of 4% is 0.3% for both No. 1 and No. 2, and As for the value of the steepness degree excluding the range from the end to the width of 10%, the maximum steepness value in both No. 1 and No. 2 was 0.1%, showing a very good value. The reason why No. 1 had a better steepness value than No. 2 is that No. 1 has a larger number of fine edge waves, so it is thought that the lifting height per minute edge wave is decreasing. On the other hand, in Comparative Examples No. 11 to No. 13, the number of minute edge waves is small, and excessive edge waves are also formed more than in the examples of the present invention. Therefore, it was confirmed that the maximum steepness was a value worse than that of the example of the present invention. As shown in FIGS. 4 and 5, in order to make the maximum steepness of the comparative example 0.1 or less, it is necessary to trim both ends of the comparative example 11 about 200 mm, the comparative example 12 about 120 mm, and the comparative example 13 about 230 mm. Can be confirmed. For this reason, the sample of the comparative example is concerned about a significant decrease in yield.

From the above point of view, according to the present invention, very good flatness can be imparted even if the thickness is widened in a thin Fe-Ni alloy thin plate having a thickness of 0.2 mm or less. Therefore, adhesion and etching properties are also good, and it can be applied to various uses.

Subsequently, the condition of the tension leveler in shape correction was changed, and the influence was confirmed. First, a material for cold rolling having a width of 730 mm was prepared, and a thin Fe-Ni alloy sheet was produced under the same conditions as in Example 2 of the present invention until finish cold rolling. Subsequently, the conditions of the elongation rate were changed to the sample after finish cold rolling, and the sample of this invention example and the sample of a comparative example were produced. Here, the elongation rate of the sample of Inventive Example 3 was 0.5, the elongation rate of the sample of Comparative Example 14 was 0.2, and the elongation rate of the sample of Comparative Example 15 was 0.8. As for the tension (unit tension), shape correction was performed under the conditions of 60 kgf/mm<2> in both of this invention example and a comparative example. In addition, as in Example 1, no heat treatment was performed after cold rolling.

As shown in Table 3, in the example of the present invention having an elongation of 0.5, a large number of fine edge waves were formed, and a value having a small number of excessive edge waves was shown. On the other hand, Comparative Example 14 had a small number of fine edge waves, and the steepness was also higher than that of the Example of the present invention. On the other hand, in Comparative Example 15, although the number and steepness of the fine edge waves were about the same, an irregular shape was generated in the center portion in the width direction of the sample, and the result was inferior in shape to the present invention. In addition, since the shape correction conditions of Comparative Example 15 were too high in the elongation rate, it was also confirmed that there were samples that were broken when the samples were corrected in multiple shapes under the same conditions.

1: lamination 2: edge wave
2a: Convex edge wave toward the upper surface of the thin plate
2b: Concave edge wave toward the upper surface of the thin plate
11a, 11b: work roll 12a, 12b: intermediate roll
13a, 13b: backup roll D1, D2: intermediate roll shift amount
L: rolling direction length P1, P2: thin plate end
Q1, Q2: Middle roll end (tapered end) W: Sheet width
Wm: the maximum length of the edge wave in the direction perpendicular to the rolling direction

Claims (6)

An intermediate cold rolling process in which an intermediate cold rolled material with a thickness of 0.4 mm or less is produced by performing cold rolling on a cold rolling material using an Fe-Ni alloy hot rolled material, and
A finish cold rolling step of cold rolling the intermediate cold-rolled material to obtain a thin plate having a thickness of 0.2 mm or less;
Including a shape correction step of performing shape correction on the thin plate,
In the finish cold rolling process, a multistage rolling mill having an intermediate roll shift mechanism is used, and cold rolling is performed by adjusting the intermediate roll shift amount, which is a parallel distance between the intermediate roll end and the intermediate cold rolled material end, to 0 to +9 mm,
In the shape correction step, a method of manufacturing an Fe-Ni-based alloy thin plate, characterized in that shape correction of an elongation rate of 0.3 to 0.7 is performed. The method of claim 1,
The cold rolling rate in the finish cold rolling process is a method of manufacturing an Fe-Ni-based alloy thin plate, characterized in that 15 to 50%. The method according to claim 1 or 2,
A method of manufacturing an Fe-Ni-based alloy thin plate, characterized in that the plate width of the thin plate is 500 to 1200 mm. In the Fe-Ni alloy thin plate having a thickness of 0.2 mm or less,
The thin plate has edge waves at both ends of the thin plate in the rolling right angle direction, wherein the maximum length in the rolling right angle direction is within 10% of the width of the thin plate,
The Fe-Ni alloy thin plate, characterized in that 10 or more edge waves are formed at both ends of the thin plate in the rolling direction per 800 mm of the length of the thin plate in the rolling direction. The method of claim 4,
Fe-Ni-based alloy thin plate, characterized in that the edge wave having a maximum width exceeding 10% of the width of the thin plate is not more than 3 per 800 mm at both ends of the thin plate in the rolling direction. The method according to claim 4 or 5,
Fe-Ni-based alloy thin plate, characterized in that the plate width of the thin plate is 500 ~ 1200㎜.

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