KR101485642B1 - Hot rolling apparatus and method for titanium plate - Google Patents

Abstract

The present invention relates to a hot rolling apparatus and a hot rolling method for a titanium plate material, which comprises a heating unit for heating a titanium plate material, a rough rolling unit for roughly rolling the titanium plate material, and a step for transferring the titanium plate material from the heating unit to the rough rolling unit Wherein the titanium plate material supported by the skid of the heating section is formed with a skid cooling section and the transfer section includes a heating stand for heating the skid cooling section of the titanium plate material, A hot rolling apparatus and a hot rolling method of a titanium plate material for improving the surface quality of a titanium plate material by preventing the curving phenomenon of the titanium plate material by heating the portion.

Description

Technical Field [0001] The present invention relates to a hot rolling apparatus and a hot rolling apparatus for a titanium plate,

The present invention relates to a hot rolling apparatus and a hot rolling method for a titanium plate material, and more particularly, to a hot rolling apparatus and a hot rolling method of a titanium plate material for preventing scratches on the surface of a titanium plate material and improving surface quality.

Titanium has been widely used in aerospace, space, and marine fields due to its light weight, high strength and non-elasticity, and excellent corrosion resistance, and its use is increasing with the development of aviation and space industry. Recently, it is used not only for light weight but also for military and civil aircraft requiring extreme durability and corrosion resistance, satellite launch rocket and high speed ship which can not cope with aluminum, but also used in automobile, food, refinery, chemical, medical field The use of titanium is expanding.

In order to produce such a titanium plate material, a plurality of unit processes must be performed, and such a unit process includes a step of hot-rolling the titanium plate material. At this time, if the temperature deviation of the titanium plate material is severe, the titanium plate material may be curved in the rough rolling step, and thus the surface quality may be defective. Therefore, in order to solve such a problem, studies have been made to improve the surface quality of the titanium plate material.

The present invention is to provide a hot rolling apparatus and a hot rolling method of a titanium plate material for preventing surface curvature of a titanium plate material and improving surface quality.

A hot rolling apparatus for a titanium plate material according to an embodiment of the present invention includes a heating unit for heating a titanium plate material, a rough rolling unit for roughly rolling the titanium plate material, and a transfer unit for transferring the titanium plate material from the heating unit to the rough rolling unit Wherein the titanium plate material supported by the skid of the heating section is formed with a skid cooling section and the transfer section may include a heating table for heating the skid cooling section of the titanium plate material.

Here, the skid of the heating portion can be cooled by the cooling water.

In addition, the heating unit may include a heating furnace for heating the titanium plate material, the skid for supporting the titanium plate material, and a working beam for transporting the titanium plate material.

Further, the heating unit can maintain the upper surface temperature of the titanium plate material higher than the lower surface temperature.

In addition, the difference between the upper surface temperature and the lower surface temperature of the titanium plate may be 10 ° C or less.

Further, the heating stand of the conveyance unit may be a high frequency induction heating coil.

In addition, the heating stand may heat the skid cooling portion of the titanium plate so that the temperature deviation between the lower surface and the center portion of the titanium plate material on which the skid cooling portion is formed is 50 ° C or less.

The rough rolling section may include a feed roll portion provided on the input / output side for feeding the titanium plate material, a work roll portion rolling the titanium plate material supplied by the feed roll portion, and a work roll portion provided between the feed roll portion and the work roll portion, And a guide portion for guiding the titanium plate material.

A method for hot rolling a titanium plate material according to an embodiment of the present invention includes the steps of moving a titanium plate material to a heating furnace while heating the titanium plate material while supporting the titanium plate material with a skid in the heating furnace, A step of transferring the titanium plate material discharged from the heating furnace to the rough rolling section, heating the skid cooling section formed on the titanium plate material supported by the skid, and rough rolling the titanium plate material in the rough rolling section can do.

At this time, in the step of moving the titanium plate material, the upper surface of the titanium plate material can be maintained at a higher temperature than the lower surface.

In addition, the upper surface of the titanium plate material can be maintained at a temperature of 10 DEG C or less higher than the lower surface.

In the step of heating the skid cooling part, the skid cooling part of the titanium plate may be heated so that a temperature deviation between the lower surface and the center part of the titanium plate material on which the skid cooling part is formed is 50 ° C or less.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to this, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may appropriately define the concept of a term in order to best describe its invention The present invention should be construed in accordance with the spirit and scope of the present invention.

According to the hot rolling apparatus and the hot rolling method of the present invention, it is possible to improve the surface quality of the titanium plate by preventing the downward curving of the titanium plate by the heating of the skid cooling unit by using the heating table.

According to the present invention, the surface quality of the titanium plate can be improved by keeping the upper surface temperature of the titanium plate higher than the lower surface temperature by 10 ° C or less to prevent the titanium plate from curving upward in the rough rolling section.

1 is a schematic view of a hot rolling apparatus for a titanium plate according to an embodiment of the present invention.
2 is a view showing a heating unit of the hot rolling apparatus of the titanium plate material shown in FIG.
Fig. 3 is a view showing a transfer section of the hot rolling apparatus of the titanium plate material shown in Fig.
Fig. 4 is a view showing the rough rolling section of the hot rolling apparatus of the titanium plate material shown in Fig. 1. Fig.
5 is a view for comparison with a hot rolling apparatus for a titanium plate according to an embodiment of the present invention.
6 is a flowchart illustrating a hot rolling method of a titanium plate according to an embodiment of the present invention.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and examples taken in conjunction with the accompanying drawings. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 1 is a schematic view of a hot rolling apparatus 100 for a titanium plate according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a heating unit 110 of a hot rolling apparatus 100 of a titanium plate shown in FIG. And FIG. 3 is a view showing a transfer section 120 of the hot rolling apparatus 100 of the titanium plate material shown in FIG. Hereinafter, a hot rolling apparatus 100 for a titanium plate according to the present embodiment will be described with reference to the drawings.

1, a hot rolling apparatus 100 for a titanium plate material according to the present embodiment includes a heating unit 110 for heating a titanium plate material 200, a rough rolling unit for roughly rolling the titanium plate material 200 And a transfer part 120 for transferring the titanium plate material 200 from the heating part 110 to the rough rolling part 130. The titanium plate material 200 formed by the skid 112 of the heating part 110 Can be locally heated to the heating stand 121 of the conveyance unit 120. [0044]

As shown in FIG. 2, the heating unit 110 is a member for heating while moving the titanium plate material 200.

Here, the heating unit 110 may include a heating furnace 111, a skid 112, and a working beam 113. The heating furnace 111 can heat the titanium plate material 200 by positioning the titanium plate material 200 therein while the titanium plate material 200 can be supported by the skid 112. In addition, the working beam 113 can move the titanium plate 200 supported by the skid 112 outwardly, for example, by upward, downward, and backward movement.

On the other hand, it may be important to cool the skid 112 since the skid 112 can be deformed by the weight of the titanium plate 200. Therefore, in the present embodiment, the skid 112 can be cooled with cooling water. For example, the skid 112 may be cooled by forming a flow path inside or outside the skid 112 and passing cooling water through the flow path.

At this time, when the skid 112 is used in a cooled state by the cooling water, the temperature of the region of the titanium plate 200 supported by the skid 112 may be relatively low. That is, the skid cooling part 210 due to the cooling skid 112 may be locally formed in the titanium plate material 200. Here, the skid cooling part 210 may be formed only in the portion of the titanium plate material 200 that is in direct contact with the skid 112, or may be formed to a predetermined distance therefrom.

On the other hand, in the heating furnace 111 in which the upper part is opened, the upper surface temperature of the titanium plate material 200 may be lower than the lower surface temperature due to the convection. In this embodiment, Can be controlled to maintain the upper surface temperature of the substrate 200 higher than the lower surface temperature. At this time, the heating unit 110 can keep the upper surface temperature of the titanium plate 200 higher than the lower surface temperature by 10 ° C or less. If the upper surface temperature of the titanium plate 200 is lower than the lower surface temperature, the titanium plate 200 may be curved upward when the titanium plate 200 is rough-rolled as will be described later.

3, the transfer unit 120 is a member for transferring the titanium plate material 200 from the heating unit 110 to the rough rolling unit 130. As shown in FIG.

Here, the transfer unit 120 may include a plurality of table rolls 122 and a heating table 121. The table roll 122 can transfer the titanium plate 200 from the heating portion 110 to the rough rolling portion 130 by positioning the titanium plate 200 on the upper portion. In addition, the heating table 121 can locally heat the skid cooling unit 210 of the titanium plate material 200 formed by the skid 112 in the heating unit 110.

Specifically, the heating table 121 is implemented, for example, by a high frequency induction heating coil, so that the skid cooling unit 210 can be locally heated. At this time, since the titanium plate 200 is moved by the table roll 122, the heating table 121 does not necessarily correspond to the number of the skid cooling units 210. For example, The heating table 121 may be operated only when the heater 210 is positioned on the heating table 121 to heat the plurality of the skid cooling units 210 locally. Of course, it is also possible to implement a plurality of heating tables 121.

On the other hand, when the heating table 121 locally heats the skid cooling part 210 of the titanium plate material 200, the downward movement of the titanium plate material 200 by the skid cooling part 210 The curvature phenomenon can be prevented. At this time, the heating table 121 locally heats the skid cooling unit 210 to control the temperature deviation between the lower surface and the central part of the titanium plate material 200 in which the skid cooling unit 210 is formed to be 50 ° C or less.

FIG. 4 is a view showing the rough rolling part 130 of the hot rolling device 100 of the titanium plate material shown in FIG. 1, FIG. 5 is a view showing the rough rolling part 130 of the hot rolling device 100 of the titanium plate material according to the embodiment of the present invention, Fig.

As shown in FIG. 4, the rough rolling section 130 is a member for rough rolling the titanium plate material 200.

The rough rolling section 130 may include a work roll section 132, a feed roll section 131, and a guide section 133. Specifically, the work roll 132 is a member for directly rolling the titanium plate member 200, and a pair of the titanium plate members 200 may be arranged in the vertical direction. The feed roll portion 131 is a member for supplying the titanium plate member 200 to the work roll portion 132 and may be disposed in a pair in a direction parallel to the titanium plate member 200 with the work roll portion 132 interposed therebetween . That is, the feed roll portion 131 may be provided in the radial direction of the rough rolling portion 130. The guide portion 133 is a member for guiding the titanium plate 200 so that the titanium plate 200 does not enter between the work roll portion 132 and the feed roll portion 131. The guide portion 133 includes a work roll portion 132 and a feed roll portion 131 ) Can be arranged in a pair. At this time, a pair of the feed roll 131 and the guide 133 are arranged in a direction parallel to the titanium plate 200 with the work roll 132 therebetween. In the rough rolling 130, .

In the case of the hot rolling apparatus 100 for a titanium plate according to the present embodiment, since the heating unit 110 keeps the upper surface temperature of the titanium plate 200 higher than the lower surface temperature, It is possible to prevent the plate member 200 from curving upward after passing through the work roll portion 132. The heating plate 121 locally heats the skid cooling part 210 of the titanium plate 200 so that the titanium plate material 200 having passed through the work roll part 132 is cooled by the skid cooling part 210, Can be prevented.

However, when the upper surface temperature of the titanium plate material 20 is not kept higher than the lower surface temperature as shown in FIG. 5, the upper surface of the titanium plate material 20 has a larger heat emission due to the convection than the lower surface, Can have a low temperature. In this case, when the titanium plate material 20 passes through the rough rolling section 10, the tip of the titanium plate material 20 through the work roll portion 12 can be curved upward due to a temperature difference between the upper surface and the lower surface. In addition, when the temperature of the skid cooling portion is relatively low without heating the skid cooling portion of the titanium plate 20, the upwardly curved titanium plate 20 can be curved downward extremely near the skid cooling portion. Therefore, as shown in FIG. 5, the tip of the titanium plate material 20 causes contact friction with the guide portion 13, thereby causing abrasive scratches on the surface of the titanium plate material 20, resulting in poor surface quality have. In addition, if an oxide scale remains on the surface of the titanium plate material 20, abrasion scratches may be generated in which the oxide scale is pressed into the surface of the titanium plate 20 when the scratches are scratched. In the case of scratches on the surface of the oxide scale, the oxide scale is relatively deeply formed. Therefore, the oxide scale must be removed by polishing or the tip of the titanium plate 20 is cut. In particular, when the reverse rolling is performed, the tip of the upwardly curved and downwardly curved titanium plate 20 becomes the rear end, causing a vertical pivot movement when the work is pulled out from the work roll 12, It is possible to make a stronger collision contact with the portion 13.

On the other hand, in the case of using the hot rolling apparatus 100 for a titanium plate according to the present embodiment, the upper surface of the titanium plate 200 is maintained at a higher temperature than the lower surface and the skid cooling unit 210 is heated The titanium plate material 200 is not curved upward and curved downward in the bar and rough rolling section 130 and thus the surface of the titanium plate material 200 may not be scratched. In addition, since scratch marks are not generated on the surface of the titanium plate material 200, the surface quality of the titanium plate material 200 can be improved and the rate of water loss can be improved.

6 is a flowchart illustrating a hot rolling method for a titanium plate material 200 according to an embodiment of the present invention. Hereinafter, the hot rolling method of the titanium plate material 200 according to the present embodiment will be described with reference to the drawings.

First, the titanium plate material 200 is heated while moving (S110). At this time, the titanium plate material 200 can be heated while moving the titanium plate material 200 using the working beam 113 by positioning the titanium plate material 200 in the heating furnace 111 of the heating part 110 as shown in FIG. Also, in this step, the upper surface temperature of the titanium plate material 200 can be maintained at 10 ° C or less higher than the lower surface temperature.

Next, the titanium plate material 200 is transferred from the heating furnace 111 to the rough rolling section 130 (S120). At this time, the skid cooling unit 210 of the titanium plate material 200 formed by the skid 112 of the heating unit 110 can be heated by the heating stand 121 while the titanium plate material 200 is being transported. In this step, the skid cooling part 210 may be heated such that the temperature deviation between the lower surface and the center part of the titanium plate 200 on which the skid cooling part 210 is formed is 50 ° C or less.

Next, the titanium plate material 200 is rough-rolled in the rough rolling section 130 (S130). Since the upper surface temperature of the titanium plate material 200 is kept higher than the lower surface temperature and the skid cooling portion 210 is heated, the titanium plate material 200 may not be curved upward or downward.

Example

The inventor of the present invention conducted an experiment to examine the effects of the hot rolling apparatus 100 and the hot rolling method of the titanium plate material 200 as described above. The target titanium sheet 200 is made of ASTM Grade 2 material having a thickness of 210 mm, but the present invention is not limited to ASTM Grades 1 to 3 and may include Ti-6Al-4V alloy. The difference in height between the lower surface of the titanium plate 200 and the apex of the feed roll 131 was adjusted to be 35 +/- 5 mm by adjusting the position of the upper end of the work roll 132 and the front and rear feed rolls 131. The titanium sheet material 200 having a thickness of 210 mm in ASTM Grade 2 material was heated to 870 to 880 캜 and rolled up to a thickness of 28 mm in 8 passes at the rough rolling section 130. Thereafter, A 3.5 mm hot-rolled sheet was produced, and pickling was performed to examine the scratch-surface flaws generated on the lower surface of the hot-rolled titanium sheet material 200.

At this time, in the embodiment, the temperature deviation between the upper surface and the lower surface of the titanium plate material 200 is controlled to be 10 ° C or lower, and the lower part of the titanium plate material 200 in which the skid cooling part 210 is formed is heated by heating the skid cooling part 210 The temperature deviation between the surface and the center was controlled to be 50 캜 or less. In the case of the comparative example, the temperature deviation between the upper surface and the lower surface of the titanium plate 200 is controlled to 10 ° C or less, while the temperature deviation of the skid cooling portion 210 is controlled to be higher than 50 ° C (Comparative Examples 1 and 2) The temperature deviation of the skid cooling unit 210 was controlled to 50 캜 or lower, but the temperature deviation between the upper surface and the lower surface of the titanium plate 200 was controlled to exceed 10 캜 (Comparative Examples 3 to 5).

division
Temperature of titanium sheet (℃) The temperature of the skid cooling part (° C) Surface groove
Prevention level Upper surface Bottom surface Deviation center Bottom surface Deviation Example 1 880 875 5 877 850 27 ○ Example 2 880 873 7 875 840 35 ○ Example 3 880 870 10 874 840 34 ○ Example 4 880 870 10 875 825 50 ○ Example 5 870 860 10 865 815 50 ○ Comparative Example 1 870 862 8 866 810 56 X Comparative Example 2 880 870 10 875 820 55 △ Comparative Example 3 880 865 15 870 840 30 △ Comparative Example 4 880 865 15 870 820 50 X Comparative Example 5 870 850 20 860 820 40 X

* Prevention level of surface grooves: ○ (good), Δ (poor), X (bad)

Referring to Table 1, the upward curvature and the downward curvature of the titanium plate material 200 were not generated in the case of the embodiment, so that a good hot-rolled plate free of scratches on the surface of the titanium plate material 200 was produced. However, in the case of the comparative example, abrasive scratches were generated on the lower surface of the hot-rolled sheet, and in particular, as the temperature deviation between the upper surface and the lower surface of the titanium plate 200 and the temperature deviation of the skid cooling part 210 became larger, Resulting in poor surface quality.

That is, when the temperature of the upper surface of the titanium plate material 200 is maintained at 10 ° C or lower than the surface temperature of the lower surface and the temperature variation of the skid cooling part 210 is maintained at 50 ° C or lower, the surface quality of the titanium plate material 200 is improved .

Although the present invention has been described in detail with reference to the preferred embodiments thereof, it is to be understood that the present invention is not limited thereto, and the hot rolling apparatus and the hot rolling method of the titanium plate according to the present invention are not limited thereto. It will be apparent to those skilled in the art that modifications and improvements can be made thereto by those skilled in the art.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

110: heating section 111: heating furnace
112: Skid 113: Working beam
120: transfer part 121:
130: rough rolling section 131: feed roll section
132: work roll 133: guide part
200: titanium plate material 210: skid cooling part

Claims (12)

A heating unit for heating the titanium plate material;
A rough rolling section for rough rolling the titanium plate material; And
A transfer unit for transferring the titanium plate from the heating unit to the rough rolling unit;
Lt; / RTI >
Wherein the titanium plate material supported by the skid of the heating section is formed with a skid cooling section and the feed section includes a heating stand for heating the skid cooling section of the titanium plate material,
Wherein the rough rolling section includes a feed roll portion provided on the input / output side for feeding the titanium plate material, a work roll portion rolling the titanium plate material supplied by the feed roll portion, and a work roll portion disposed between the feed roll portion and the work roll portion, And a guide portion for guiding the hot rolled steel sheet. The method according to claim 1,
Wherein the skid of the heating portion is cooled by cooling water. The method according to claim 1,
The heating unit includes:
A heating furnace for heating the titanium plate material;
The skid supporting the titanium plate material; And
A working beam for transferring the titanium plate material;
And a hot rolling device for hot rolling the titanium plate material. The method according to claim 1,
Wherein the heating unit keeps the upper surface temperature of the titanium plate higher than the lower surface temperature. 5. The method of claim 4,
Wherein the difference between the upper surface temperature and the lower surface temperature of the titanium plate material is 10 占 폚 or less. The method according to claim 1,
And the heating zone of the conveyance unit is a high frequency induction heating coil. The method according to claim 1,
Wherein the heating block heats the skid cooling portion of the titanium plate material so that a temperature deviation between the lower surface and the center portion of the titanium plate material on which the skid cooling portion is formed is 50 ° C or less. delete Moving the titanium plate material by a working beam while supporting the titanium plate material by a skid in the heating furnace by heating a titanium plate material in a heating furnace;
Heating the skid cooling unit formed on the titanium plate supported by the skid to transfer the titanium plate material discharged from the heating furnace to the rough rolling unit; And
Rolling the titanium sheet material in the rough rolling section;
Lt; / RTI >
Wherein the rough rolling section includes a feed roll portion provided on the input / output side for feeding the titanium plate material, a work roll portion rolling the titanium plate material supplied by the feed roll portion, and a work roll portion disposed between the feed roll portion and the work roll portion, And a guide portion for guiding the hot rolled steel sheet. 10. The method of claim 9,
In the step of moving the titanium plate material,
Wherein the upper surface of the titanium sheet material is maintained at a temperature higher than the lower surface thereof. 11. The method of claim 10,
Wherein the upper surface of the titanium plate material is maintained at a temperature higher than < RTI ID = 0.0 > 10 C < / RTI > below the lower surface. 10. The method of claim 9,
In the step of heating the skid cooling part,
Wherein the skid cooling portion of the titanium plate material is heated so that a temperature deviation between the lower surface and the center portion of the titanium plate material on which the skid cooling portion is formed is 50 ° C or less.

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