KR102374546B1 - Pack for rolling sheet and pack rolling method for sheet - Google Patents

Abstract

A pack for rolling a sheet according to an embodiment of the present invention includes a core material; a cover material for sealing the upper surface, lower surface and side surfaces of the core material; and a corner spacer positioned outside one or more of the corner portions of the core material and interposed between the core material and the cover material. According to an embodiment of the present invention, it is possible to prevent defective shapes of the core material due to rolling and improve the yield by providing an optimal packing method of pack rolling.

Description

Pack for sheet material rolling and method for sheet material pack rolling {PACK FOR ROLLING SHEET AND PACK ROLLING METHOD FOR SHEET}

An embodiment of the present invention relates to a pack for rolling a plate and a method for rolling a pack of a plate. More specifically, an embodiment of the present invention relates to a pack for rolling a sheet material and a method for rolling a sheet material for preventing wrinkles.

Titanium alloy is difficult to manufacture thin plates because the temperature dependence of the deformation resistance is large and the processing load increases due to the temperature decrease during processing.

If the thickness of the titanium alloy is controlled to be less than 2mm, the utilization value of the plate material increases. These materials use pack rolling technology to manufacture thin plates, and pack rolling uses one or several plate materials as a core material, covers the top and bottom and slopes with cover materials, and performs vacuum welding to obtain a thin plate by hot rolling. .

However, systematic research on the pack rolling method has not been conducted, and the dimensions, thickness, and material of the core material and the cover material depend on the intuition of the manufacturer.

For pack rolling, a method for controlling the thickness of a pack rolled material is proposed, which selects a core material in consideration of the ratio of the deformation resistance of the core material and the cover material, and obtains the length of the core material by a change in the rolling load or a change in the output of a gamma-ray thickness meter. became

In addition, a pack rolling method was presented in which the core material and the cover material were selected so that the core material deformation resistance value was less than or equal to the cover material deformation resistance value, and the ratio of the thickness of the core material to the total thickness of the assembly material was adjusted.

However, it was still difficult to completely suppress the occurrence of wrinkles even by the above-described method.

An embodiment of the present invention provides a pack for rolling a plate and a method for rolling a pack of a plate. More specifically, an embodiment of the present invention provides a pack for rolling a plate material and a method for rolling a pack of a plate material to prevent the generation of wrinkles in the core material.

A pack for sheet rolling according to an embodiment of the present invention includes a core material; a cover material for sealing the upper surface, lower surface and side surfaces of the core material; and a corner spacer positioned outside at least one of the corner portions of the core material and interposed between the core material and the cover material.

The core material may be titanium or a titanium alloy.

The core material may be laminated in two or more layers.

The cover material may include an upper surface cover material for covering the upper surface of the core material, a lower surface cover material for covering the lower surface of the core material, and a side cover material connected to edges of the upper surface cover material and the lower surface cover material to cover the side surface of the core material.

The length in the rolling direction of the corner spacer may be 1 to 10% of the length in the rolling direction of the core material.

The width direction length of the corner spacer may be 1 to 10% of the width direction length of the core material.

The thickness of the corner spacer may be 101 to 120% of the total thickness of the core material.

The corner spacer and the cover material may be carbon steel, but the carbon content may be 0.40 to 0.50 wt%.

An empty space may exist between at least a part of the core material and the cover material.

Pack rolling method of a plate material according to an embodiment of the present invention comprises the steps of preparing a core material; manufacturing a pack by sealing the upper surface, lower surface and side surfaces of the core material with a cover material; and rolling the pack.

In the step of manufacturing the pack, a corner spacer may be interposed between the core material and the cover material so as to be located outside at least one of the corner portions of the core material.

The inside of the pack may be in a vacuum state of 10 ^-3 torr or less.

It may further comprise the step of heating the pack to a temperature of 850 to 950 °C before the step of rolling the pack.

In the step of rolling the pack, the rolling start temperature may be 850 to 950 ℃, the rolling end temperature may be 700 to 800 ℃.

In the step of rolling the pack, the reduction ratio per pass may be 10 to 20%.

In the step of rolling the pack, the width spread rate may be 1.1 to 2.0%.

In an embodiment of the present invention, by providing an optimal packing method of pack rolling, it is possible to prevent the occurrence of shape defects due to the rolling of the core material and improve the yield.

1 is a plan view schematically showing a pack for rolling a plate according to an embodiment of the present invention.
Figure 2 is a perspective view schematically showing a corner portion of the pack for rolling a plate according to an embodiment of the present invention.
3 is a cross-sectional view schematically showing a pack for rolling a plate according to an embodiment of the present invention.
4 is a plan view schematically showing a pack for rolling a plate according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail. However, this is provided as an example, and the present invention is not limited thereto, and the present invention is only defined by the scope of the claims to be described later.

As a method for manufacturing a thin plate of titanium or titanium alloy, which has a high temperature dependence of deformation resistance, it can be divided into a method of pack rolling at 980 ° C or lower or a method of obtaining a thin plate by reheating during rolling to remove the surface oxide layer. In the case of pack rolling, equipment investment for pack rolling may occur, and when rolling without a pack, a decrease in product error rate may occur due to the surface oxide layer.

1 to 3 schematically show a pack 100 for rolling a plate according to an embodiment of the present invention. The structure of the pack 100 for rolling a sheet material of FIGS. 1 to 3 is only for illustrating the present invention, and the present invention is not limited thereto. Accordingly, the pack 100 for rolling the plate material of FIG. 1 may be deformed in various forms.

1 to 3, the pack 100 for rolling a sheet is a core material 10; a cover material 20 for sealing the upper surface, the lower surface and the side surface of the core material 10; and a corner spacer 30 positioned outside one or more of the corners of the core material 10 and interposed between the core material 10 and the cover material 20 . In addition, other components may be included as needed.

As in FIGS. 1 to 3 , since the corner spacer 30 is interposed between the core material 10 and the cover material 20 , there is an empty space 40 between the core material 10 and the cover material 20 at least in part. ) may exist. Specifically, an empty space 40 may exist in a portion of the edge portion of the core material 10 that the corner spacer 30 does not contact. In addition, an empty space 40 may exist between the upper and lower surfaces of the core material 10 and the cover material 20 .

In one embodiment of the present invention, a continuous hot rolling facility for steel manufacturing is used to obtain a thin plate without reheating during rolling, and wrinkles in the width direction (y direction) or longitudinal direction (x direction) of the core material 10 are generated. In order to suppress the slab, a corner spacer 30 forming a right angle is installed at the four corners inside the pack slab and rolled.

Since the corner spacers 30 exist, it is possible to secure a space for widening the core material 10 during rolling.

The type of the core material 10 is not particularly limited, but may be titanium or a titanium alloy having a high temperature dependence of deformation resistance.

As shown in FIG. 2 , the core material 10 may be laminated in two or more layers for efficiency of rolling. At this time, the release material may be applied to the surface of the core material 10 to prevent fusion between the core materials 10 at a high temperature.

The cover material 20 seals the upper surface, the lower surface, and the side surface of the core material 10 . At this time, sealing means separating the inner and outer spaces to prevent outside air from entering the inside of the pack.

The cover material 20 includes an upper cover material for covering the upper surface of the core material 10, a lower surface cover material for covering the lower surface of the core material, and a side cover material connected to the edges of the upper surface cover material and the lower surface cover material to cover the side surface of the core material. can After laminating the top cover material and the bottom cover material on the top and bottom of the corner spacer 30, the side cover material is sealed by welding the top cover material and the bottom cover material to surround the side surface of the core material 10. can

The cover material 20 may be made of a material that is easy to roll, such as carbon steel. More specifically, the carbon content may be 0.40 to 0.50 wt%.

The corner spacer 30 is positioned outside one or more of the corners of the core material 10 . When the corner spacer 30 is positioned outside the edge of the core material 10 rather than the corner, there may be a problem in that the core material 10 is rolled non-uniformly.

1 shows an example in which the corner spacers 30 are positioned at all four corners of the core material 10 , but the present invention is not limited thereto. For example, it is also possible to position two diagonally.

The shape of the corner spacer 30 is not particularly limited as long as it is in contact with the corner of the core material 10 and can be interposed between the core material 10 and the cover material 20 . As an example, as shown in FIG. 4 , it may be in the form of an 'L' curved at an angle of 90 degrees.

The length in the rolling direction (S _R ) of the corner spacer 30 may be 1 to 10% of the length in the rolling direction ( _CR ) of the core material 10 . If the length (S _R ) in the rolling direction of the corner spacer 30 is too short, it may be difficult to achieve the purpose of preventing the occurrence of wrinkles. If the length (S _R ) in the rolling direction of the corner spacer 30 is too long, the thickness may be non-uniformly rolled at the edge of the core material 10 . More specifically, the length in the rolling direction (S _R ) of the corner spacer 30 may be 1.5 to 5% of the length ( _CR ) in the rolling direction of the core material 10 .

The width direction length (S _W ) of the corner spacer 30 may be 1 to 10% of the width direction length (C _W ) of the core material 10 . If the width direction length (S _W ) of the corner spacer 30 is too short, it may be difficult to achieve the purpose of preventing wrinkles. If the width direction length (S _W ) of the corner spacer 30 is too long, the thickness may be unevenly rolled at the edge of the core material 10 . More specifically, the width direction length (S _W ) of the corner spacer 30 may be 1.5 to 5% of the width direction length (C _W ) of the core material 10 .

The thickness (S _T ) of the corner spacer 30 may be 101 to 120% of the total thickness ( _CT ) of the core material (10). If the thickness (S _T ) of the corner spacer 30 is too thin, it may be difficult to achieve the purpose of preventing wrinkles. If the thickness (S _T ) of the corner spacer 30 is too thick, the thickness may be non-uniformly rolled at the edge of the core material 10 . More specifically, the thickness (S _T ) of the corner spacer 30 of the corner spacer 30 may be 102 to 110% of the total thickness ( _CT ) of the core material 10 . At this time, the total thickness (C _T ) of the core material 10 means the sum of the thicknesses of the laminated core material 10 .

The corner spacer 30 may be made of a material that is easy to roll, such as carbon steel. More specifically, the carbon content may be 0.40 to 0.50 wt%. The corner spacer 30 may be made of the same material as the cover material 20 .

Pack rolling method of a plate material according to an embodiment of the present invention comprises the steps of preparing a core material; manufacturing a pack by sealing the upper surface, lower surface and side surfaces of the core material with a cover material; and rolling the pack.

In the step of manufacturing the pack, a corner spacer may be interposed between the core material and the cover material so as to be located outside one or more of the corner portions of the core material.

Since the core material, the cover material, and the corner spacer have been described in detail in the description of the above-described sheet material rolling pack, the overlapping description will be omitted.

The inside of the pack may be in a vacuum state of 10 ^-3 torr or less. When outside air flows into the pack, the core material is oxidized and the yield may decrease.

It may further comprise the step of heating the pack to a temperature of 850 to 950 °C before the step of rolling the pack. By heating the pack to an appropriate temperature, the core material can be easily rolled.

In the step of rolling the pack, the rolling start temperature may be 850 to 950 ℃, the rolling end temperature may be 700 to 800 ℃. By heating the pack to an appropriate temperature, the core material can be easily rolled.

In the step of rolling the pack, the reduction ratio per pass may be 10 to 20%. If the reduction ratio is too high or low, it is difficult to roll the core material to an appropriate thickness.

In the step of rolling the pack, the width spread rate may be 1.1 to 2.0%. It can be expressed as width spread rate W = WCore(initial/final) / WCover(initial/final) × 100. When the width spread ratio is 1.0, the core material and the cover material have the same elongation during rolling, so that wrinkles do not occur in the core material. In one embodiment of the present invention, although the width spread ratio is 1.1% or more, by interposing the corner spacers, it is possible to secure a space for the width spread of the core material generated during rolling to improve the surface properties. Specifically, the roughness of the rolled core material may be 0.1 to 3.0㎛.

Hereinafter, preferred examples and comparative examples of the present invention will be described. However, the following examples are only preferred examples of the present invention, and the present invention is not limited thereto.

Example

A pack was prepared by interposing corner spacers at the four corners as shown in FIG. 1 and sealing it with a cover material. In this case, Examples 1 to 3 interposed the corner spacer, but Comparative Examples 1 to 2 did not interpose the corner spacer, and the cover material was sealed without an empty space.

The pack was heated to the reheating temperature summarized in Table 1 below, and rolled at a reduction ratio of 10%. The cover material was peeled off, and the width spread ratio, the roughness of the rolled core material, and whether wrinkles occurred are summarized in Table 1.

division corner
spacer reheat
Temperature (℃) reduction rate
(%) Wide spread rate (%) illuminance
(μm) note
(wrinkle) Comparative Example 1 × 950 10 1.2 18.6 Occur Comparative Example 2 × 940 10 1.2 4.7 Occur Example 1 O 950 10 1.6 1.1 non-occurring Example 2 O 940 10 1.6 0.7 non-occurring Example 3 O 920 10 1.6 0.6 non-occurring

As shown in Table 1, the width spread ratio of the Example was the same as 1.6, but the roughness was higher as the reheating temperature was higher, and no surface wrinkles were generated at the roughness of 1.1 or less. That is, it can be confirmed that the reason that wrinkles in the width direction did not occur even when the width spread ratio is 1.0 or more is because the space for the width spread of the core material generated during rolling is secured by the corner spacer.

On the other hand, in Comparative Examples 1 and 2, the width spread rate was lower than that of the Example, but it was confirmed that the roughness was high and wrinkles were generated.

The present invention is not limited to the above embodiments, but can be manufactured in various different forms, and those of ordinary skill in the art to which the present invention pertains can take other specific forms without changing the technical spirit or essential features of the present invention. It will be understood that it can be implemented as Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

100: a pack for sheet material rolling, 10: a core material,
20: cover material, 30: corner spacer
40: empty space

Claims (15)

core material;
a cover material sealing the upper surface, lower surface and side surfaces of the core material; and
A pack for rolling a sheet material located outside one or more of the corner portions of the core material, and comprising a corner spacer interposed between the core material and the cover material. According to claim 1,
The core material is a titanium or titanium alloy pack for rolling a titanium plate. According to claim 1,
The core material is a pack for rolling a sheet material laminated in two or more layers. According to claim 1,
The cover material includes an upper cover material for covering the upper surface of the core material, a lower surface cover material for covering the lower surface of the core material, and a side cover material connected to edges of the upper surface cover material and the lower surface cover material to cover the side surface of the core material. dragon pack. According to claim 1,
The length in the rolling direction of the corner spacer is 1 to 10% of the length in the rolling direction of the core material. According to claim 1,
The width direction length of the corner spacer is 1 to 10% of the width direction length of the core material. According to claim 1,
The thickness of the corner spacer is 101 to 120% of the total thickness of the core material for rolling a sheet material. According to claim 1,
The corner spacer and the cover material are carbon steel, a carbon content of 0.40 to 0.50 wt% of a sheet rolling pack. According to claim 1,
A sheet material rolling pack having an empty space between at least a portion of the core material and the cover material. preparing a core material;
manufacturing a pack by sealing the upper surface, lower surface and side surfaces of the core material with a cover material; and
rolling the pack;
including,
In the step of manufacturing the pack, a method for rolling a pack of a sheet material by interposing a corner spacer between the core material and the cover material so as to be located outside at least one of the corner portions of the core material. 11. The method of claim 10,
The pack rolling method of the plate material in a vacuum state of 10 ^-3 torr or less inside the pack. 11. The method of claim 10,
Pack rolling method of the sheet material further comprising the step of heating the pack to a temperature of 850 to 950 ℃ before the step of rolling the pack. 11. The method of claim 10,
In the step of rolling the pack, the rolling start temperature is 850 to 950 ℃, the rolling end temperature is 700 to 800 ℃ pack rolling method of the sheet material. 11. The method of claim 10,
In the step of rolling the pack, a pack rolling method of a sheet material having a reduction ratio of 10 to 20% per pass. 11. The method of claim 10,
In the step of rolling the pack, a pack rolling method of a sheet material having a width spread ratio of 1.1 to 2.0%.

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