KR101522785B1 - Method and apparatus for cold rolling of titanium plate - Google Patents

Abstract

A method and apparatus for cold rolling a titanium sheet material. The disclosed method for cold rolling a titanium sheet material comprises the steps of: joining a leading end of a preceding first sheet to a trailing second sheet, wherein at least one of the first sheet and the second sheet is a titanium sheet; Supplying the bonded first and second plates to a continuous rolling mill having a plurality of stands sequentially aligned; And first continuously rolling the supplied sheet material by the continuous rolling mill. According to the present invention, excellent surface quality and high productivity can be satisfied at the same time. Further, according to the present invention, there is an advantage that a cold-rolled steel sheet of titanium surface can be continuously produced with excellent surface quality without generating heatstreaks even under low-pressure and high-speed rolling conditions.

Description

[0001] METHOD AND APPARATUS FOR COLD ROLLING OF TITANIUM PLATE [0002]

The present invention relates to a method and apparatus for cold rolling a titanium sheet material, and more particularly to a method and apparatus for cold rolling a titanium sheet material that simultaneously satisfies excellent surface quality and high productivity.

Generally, cold rolling of a titanium plate having large deformation resistance and high activity is a multi-pass reversible rolling with a small diameter multi-roll rolling machine having a diameter of 50 to 100 mm, which is represented by Zenjimmy Mill, and a low pressure rate of less than 15% per pass and a rolling speed of 150 mpm Lt; / RTI >

The multi-pass reversing rolling method using such a small-diameter rolling mill is a method generally used for rolling stainless steels, electric steel sheets, high carbon steels, non-ferrous metal materials such as titanium or aluminum and copper with high deformation strength. In particular, , The number of passes is remarkably increased as compared with the rolling of other steel types, so that the rolling productivity is remarkably low.

Conventionally, in order to increase the productivity in cold rolling of such a titanium plate, a cold rolling method using a tandem rolling system having a large diameter roll of carbon steel cold rolling has been proposed. However, the total rolling reduction obtained by one tandem rolling is limited, There is no tandem mill actually operated due to a problem that requires further processing of the property tax or re-annealing with the secondary rolling due to quality defects such as micro cracks on the rolled plate.

In the carbon steel continuous cold rolling method using such a large diameter roll, high-speed rolling of the emulsion lubrication system is required in order to increase the productivity. As a result, the temperature rise in the roll bite and the development of the surface hardened layer, It is inevitable that rolling conditions such as rolling speed and rolling reduction are limited, and it is difficult to exhibit the effect of tandem rolling.

In order to solve the problems of the prior art as described above, the present invention proposes a cold rolling method and apparatus for a titanium plate material satisfying both excellent surface quality and high productivity.

Other objects of the invention will be apparent to those skilled in the art from the following examples.

According to a preferred embodiment of the present invention, at least one of the first plate and the second plate is formed by joining a front end of a preceding first plate and a front end of a following second plate, Titanium plate -; Supplying the bonded first and second plates to a continuous rolling mill having a plurality of stands sequentially aligned; And continuously subjecting the supplied sheet to continuous rolling with the continuous rolling mill.

And secondarily continuously rolling the first continuously rolled plate with the continuous rolling mill.

The continuous rolling mill includes four to six stands which are sequentially aligned, and each of the four to six stands includes at least one operating roll, and the diameter of the operating roll may range from 130 mm to 150 mm.

The four to six stands may be Z-Hi mills.

The rolling oil is injected into the inlet and outlet of each of the plurality of stands, and the first continuous rolling step and the second continuous rolling step may be performed using the rolling oil.

The rolling oil is a mineral oil-based rolling oil having a viscosity of 15 to 25 cSt (at 40 DEG C), a saponification degree of 40 mgKOH / mg or more, and a flash point of 250 DEG C or more.

The plurality of stands may each be a sendzimir mill.

And then reversibly rolling the primary continuously rolled plate to a reversible rolling machine connected to the continuous rolling mill.

The reversible rolling mill may be Zen zimmermill.

According to another embodiment of the present invention, there is provided a joining portion for joining a leading end portion of a preceding first plate to a trailing second plate portion, wherein at least one of the first plate and the second plate is a titanium plate; A continuous rolling mill having a plurality of stands sequentially aligned; And a supply unit for supplying the bonded first and second plates to the continuous rolling mill, wherein the supplied plate is continuously rolled twice or more by the continuous rolling mill. do.

According to another embodiment of the present invention, there is provided a joining portion for joining a leading end portion of a preceding first plate to a trailing second plate portion, wherein at least one of the first plate and the second plate is a titanium plate; A continuous rolling mill having a plurality of stands sequentially aligned; A reversing mill connected to the continuous mill; And a supply section for supplying the bonded first and second plates to the continuous rolling mill, wherein the supplied plate is subjected to continuous rolling with the continuous rolling mill and then to reverse milling with the reversing mill, A cold rolling apparatus is provided.

According to the present invention, excellent surface quality and high productivity can be satisfied at the same time.

Further, according to the present invention, there is an advantage that a cold-rolled steel sheet of titanium surface can be continuously produced with excellent surface quality without generating heatstreaks even under low-pressure and high-speed rolling conditions.

FIG. 1 is a flowchart showing a cold rolling method of a titanium plate material according to an embodiment of the present invention with time.
2 is a view showing a cold rolling apparatus of a titanium plate material according to an embodiment of the present invention.
3A is a diagram schematically showing a process in which a primary continuously rolled plate is subjected to second continuous rolling through a continuous rolling mill used in a first continuous rolling according to an embodiment of the present invention.
FIG. 3B is a diagram schematically illustrating a process in which a first continuous-rolled plate is reversibly rolled through a reversible rolling mill connected to a continuous rolling mill, according to another embodiment of the present invention. FIG.
Fig. 4 is a view showing the reversible rolling mill in more detail in Fig. 3b.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a flowchart illustrating a cold rolling method for a titanium plate material according to an embodiment of the present invention, according to the flow of time.

2 is a view showing a cold rolling apparatus for a titanium plate according to an embodiment of the present invention.

As shown in FIGS. 1 and 2, the titanium sheet cold rolling method includes a step S110 of bonding a first sheet to a second sheet, a step S120 of supplying the bonded sheet to a continuous rolling mill, (S130), and a second continuous rolling step (S140). The titanium plate cold rolling apparatus 100 includes a pair of prills 110a and 110b, a joint 120, a feeder 130, a continuous rolling mill 140, a rolling oil jetting unit 150, and a coil 160 do.

More specifically, in step S110, the joining portion 120 joins the first plate and the second plate, which are supplied from the pay ropes 110a and 110b, and joins the leading end of the first plate and the trailing second plate As shown in Fig. The joining can be done by welding, for example.

At least one of the first plate and the second plate may be a titanium plate, and both the first plate and the second plate may be a titanium plate. According to another embodiment of the present invention, , And the trailing second plate may be a titanium plate material.

Next, in step S120, the supplying section 130 supplies the bonded first plate and the second plate to a continuous rolling mill. According to an embodiment of the present invention, the supply unit 130 may be a looper.

In the step S130, the continuous rolling mill 140 first continuously rolls the supplied sheet material.

To this end, the continuous rolling mill 140 comprises a plurality of stands 142, 144, 146 and 148 arranged in order, wherein each stand comprises at least one operating roll, the diameter of which is between 130 mm and 150 mm Lt; / RTI >

For example, each stand of the continuous rolling mill 140 may be a Z-Hi mill.

That is, the continuous rolling mill 140 according to an embodiment of the present invention may be one in which the underground mills having the heavy rolls of 130 mm to 150 mm are continuously arranged.

In the present invention, for convenience of description, it is assumed that the continuous rolling mill 140 includes four stands 142, 144, 146 and 148, but the present invention is not limited thereto. 140 may have 4 to 6 stands.

In the case where the number of stands provided in the continuous rolling mill 140 is less than four, it is difficult to satisfy the voltage lowering rate of 67% in the step S130 in which rolling is performed once. In the case where the number of stands is larger than six, It is preferable to provide six stands.

The mineral oil is supplied as the rolling oil to the inlet and outlet of each stand 142, 144, 146, 148 constituting the continuous rolling mill 140.

The mineral oil-based rolling oil according to one embodiment of the present invention may have a viscosity of 15 to 25 cSt (at 40 DEG C), a saponification degree of 40 mgKOH / mg or more, and a flash point of 250 DEG C or more.

When the viscosity of the rolling oil is less than 15 cSt (@ 40 DEG C), the reduction rate of 67% can not be satisfied when the continuous rolling mill passes once due to the lack of lubricity. When the viscosity exceeds 25 cSt (@ 40 DEG C) , The viscosity of the mineral oil-based rolling oil is preferably in the range of 15 to 25 cSt (@ 40 DEG C).

If the flash point of the rolling oil is lower than 250 占 폚, a fire may occur at a primary maximum rolling speed of 250 mpm. Therefore, the flash point of the mineral oil-based rolling oil is preferably 250 占 폚 or higher.

Further, when the degree of saponification is less than 40 mg KOH / mg, the lubricity may be insufficient in high-speed rolling under high pressure, so that the degree of saponification of the mineral oil-based rolling oil may be 40 mg KOH / mg or more.

2, the titanium plate cold rolling apparatus 100 according to an embodiment of the present invention may include a rolling oil jetting unit 150 for supplying the rolling oil as described above.

More specifically, the rolling oil jetting section 150 includes a rolling oil tank 152 located at the bottom of the continuous rolling mill 140, a rolling oil filtering section 154 for filtering the rolling oil contained in the rolling oil tank, And a rolling oil supply pump 156 for supplying the supplied oil to the nozzles installed at the inlets and outlets of the respective nozzles 142, 144, 146, and 148, respectively.

Meanwhile, according to another embodiment of the present invention, the plurality of stands 142, 144, 146, and 148 constituting the continuous rolling mill 140 may each be a small diameter roll mill sendzimir mill. At this time, the number of stands is four or more so as to satisfy the voltage lowering rate of 67% in the step of performing one rolling, and the number of stands may be six or less so as not to over-install.

Subsequently, in step S140, the continuous rolling mill 140 secondarily continuously rolls the first continuously rolled plate.

According to one embodiment of the present invention, since the primary continuous rolling in the step S130 and the secondary continuous rolling in the step S140 are performed in the same continuous rolling mill 140, The continuously rolled plate can be wound on the coil 160 and then fed to the continuous rolling mill 140 for secondary continuous rolling.

FIG. 3A schematically shows a process in which a first continuous-rolled plate is subjected to second continuous rolling through a continuous rolling mill used in a first continuous rolling according to an embodiment of the present invention.

As shown in FIG. 3A, the titanium sheet material is subjected to the first continuous rolling and the second continuous rolling through the same continuous rolling mill 140, and the first continuous-rolled titanium sheet is subjected to the first continuous rolling The second continuous rolling is performed once again through the frills 110, the joining portion 120, the feeding portion 130, the continuous rolling mill 140, the rolling oil jetting portion 150, and the coiler 160.

3A, the titanium plate material cold rolling apparatus 100 is installed on the left and right sides, but the titanium plate material is rolled through one titanium sheet material cold rolling apparatus 100 twice, As described above.

The following table shows the result of cold rolling a titanium plate by performing only reversible rolling in a conventional method, Zenjimiho Mill.

pass Thickness
Mm Output Thickness
Mm Reduction rate
% Rolling speed
mpm Heat streak Remarks One 3.50 3.16 9.7 50 Comparative Example 2 3.16 2.76 12.6 150 3 2.76 2.40 13.0 150 4 2.40 2.08 13.3 150 5 2.08 1.82 12.5 150 6 1.82 1.58 13.1 150 7 1.58 1.37 13.2 150 8 1.37 1.19 13.1 150 9 1.19 1.04 12.6 150 10 1.04 0.91 12.5 150 11 0.91 0.80 12.1 150 12 0.80 0.70 12.5 150 13 0.70 0.62 11.4 150 14 0.62 0.55 11.2 150 15 0.55 0.5 9.1 100 No

As shown in Table 1 above, when the titanium plate material is subjected to only the reversible rolling in the Zen Jimmy Meat Mill, the low viscosity mineral oil of 7 to 10 cSt (@ 40 DEG C) is used due to the required surface gloss quality problem, , There is a problem that the reduction rate per pass is lowered to 15% or less and the rolling speed is lowered to 150 mpm or less in the cold rolling of titanium in which high lubricity is required, resulting in a decrease in rolling productivity as the number of passes increases.

In contrast, the table below shows the results of applying the continuously rolling type titanium plate cold rolling method according to an embodiment of the present invention to 3.5t * 1290mm * coils of hot-rolled annealed titanium plate.

Primary rolling pass Thickness
Mm Output Thickness
mm Reduction rate
% Rolling speed
mpm Heat streak Remarks One 3.50 2.50 28.5 119 No Honor 2 2.50 1.87 25.2 159 No 3 1.87 1.45 22.4 205 No 4 1.45 1.19 17.9 250 No Secondary rolling pass Thickness
mm Output Thickness
mm Reduction rate
% Rolling speed
mpm Heat streak Remarks One 1.19 0.90 24.4 222 No Honor 2 2.50 0.72 20.0 278 No 3 1.87 0.59 18.1 339 No 4 1.45 0.50 15.2 400 No

As shown in Table 2, in the four stages of the underground mill having the titanium sheet cold rolling method according to one embodiment of the present invention, that is, the operation roll having a diameter of 130 mm to 150 mm, the viscosity was 15-25 cSt Deg.] C, a saponification degree of 40 mgKOH / mg or more, and a titanium sheet material subjected to primary and secondary cold rolling through a mineral oil-based rolling oil having a flash point of 250 DEG C or higher, It is possible to satisfy the excellent surface quality and the high rolling productivity.

Meanwhile, according to another embodiment of the present invention, the second continuous rolling step (S140) may be replaced with a reversible rolling step (S140 '). That is, after the steps S110 to S130 are performed, the first continuously rolled plate may be supplied to the reversing rolling mill 170, not the continuous rolling mill 140, and may be reversibly rolled.

For this purpose, the reversible rolling mill 170 is connected to the continuous rolling mill 140 and may be, for example, Zenji mill.

FIG. 3B schematically shows a process in which a first continuous-rolled plate is reversibly rolled through a reversing mill connected to a continuous rolling mill, according to another embodiment of the present invention.

As shown in FIG. 3B, the titanium sheet material is subjected to the first continuous rolling through the continuous rolling mill 140, and the first continuously rolled titanium sheet is subjected to the reversible rolling process through the reversing rolling mill connected to the continuous rolling mill.

4, the reversible rolling mill 170 also includes a rolling oil tank 172 located at the lower portion of the rolling mill, a rolling oil tank 172 located at the bottom of the rolling mill, A rolling oil filtration unit 174 for filtering the received rolling oil, and a rolling oil supply pump 176 for supplying the filtered rolling oil to the nozzles installed at the entrance and exit of the operating roll.

The following table shows the results of cold rolling of 3.5t * 1290mm * coils of a hot-rolled annealed sheet steel of titanium plate to which a reversible rolling step (S140 ') is applied in place of the second continuous rolling step (S140) according to another embodiment of the present invention .

Primary rolling pass Thickness
Mm Output Thickness
Mm Reduction rate
% Rolling speed
mpm Heat streak Remarks One 3.50 2.50 28.5 119 No Honor 2 2.50 1.87 25.2 159 No 3 1.87 1.45 22.4 205 No 4 1.45 1.19 17.9 250 No Secondary rolling pass Thickness
mm Output Thickness
Mm Reduction rate
% Rolling speed
mpm Heat streak Remarks One 1.19 1.04 12.6 150 No Honor 2 1.04 0.91 12.5 150 No 3 0.91 0.80 12.1 150 No 4 0.80 0.70 12.5 150 No 5 0.70 0.62 11.4 150 No 6 0.62 0.55 11.2 150 No 7 0.55 0.5 9.0 100 No

As shown in Table 3 above, even when the reversible rolling step (S140 ') is performed in place of the step (S140) in the secondary rolling, the number of rolling passes is relatively reduced as compared with Table 1, It is possible to obtain a titanium cold-rolled sheet excellent in surface quality.

As described above, according to the present invention, it is advantageous to continuously produce a cold-rolled steel sheet of titanium surface with excellent surface quality without generating heatstreaks even under low-pressure and high-speed rolling conditions.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

100: Titanium plate cold rolling apparatus 110:
120: junction 130:
140: Continuous rolling mill 150: Rolling oil jetting section
160: Coiler 170: Reversible rolling mill

Claims (14)

Joining the leading end of the preceding first plate to the leading end of the following second plate, at least one of the first plate and the second plate being a titanium plate;
Supplying the bonded first and second plates to a continuous rolling mill having a plurality of stands sequentially aligned; And
And first continuously rolling the supplied sheet material to the continuous rolling mill,
Further comprising the step of second continuous rolling the primary continuously rolled plate with the continuous rolling mill,
Wherein each of the four to six stands comprises at least one actuating roll, and the diameter of the actuating roll ranges from 130 mm to 150 mm. Cold rolling method. delete delete The method according to claim 1,
Wherein the four to six stands are each a Z-Hi mill. The method according to claim 1,
Rolling oil is injected into the mouth and the outlet of each of the plurality of stands,
Wherein the first continuous rolling step and the second continuous rolling step are performed using the rolling oil. 6. The method of claim 5,
Wherein the rolling oil is a mineral oil-based rolling oil having a viscosity of 15 to 25 cSt (at 40 DEG C), a saponification degree of 40 mgKOH / mg or more, and a flash point of 250 DEG C or more. The method according to claim 1,
Wherein the plurality of stands are each a sendzimir mill. Joining the leading end of the preceding first plate to the leading end of the following second plate, at least one of the first plate and the second plate being a titanium plate;
Supplying the bonded first and second plates to a continuous rolling mill having a plurality of stands sequentially aligned; And
And first continuously rolling the supplied sheet material to the continuous rolling mill,
Further comprising: reversibly rolling the first continuously rolled plate to a reversible rolling machine connected to the continuous rolling mill,
Wherein each of the four to six stands comprises at least one actuating roll, and the diameter of the actuating roll ranges from 130 mm to 150 mm. Cold rolling method. 9. The method of claim 8,
Wherein the reversible rolling mill is a Zen zimmy mill. A joining portion joining the leading end of the preceding first plate and the leading end of the succeeding second plate, at least one of the first plate and the second plate being a titanium plate;
A continuous rolling mill having a plurality of stands sequentially aligned; And
And a supply unit for supplying the bonded first and second plates to the continuous rolling mill,
The supplied sheet material is continuously rolled by the continuous rolling mill at least two times,
Wherein each of the four to six stands comprises at least one actuating roll, and the diameter of the actuating roll ranges from 130 mm to 150 mm. Sheet Cold Rolling Apparatus. delete 11. The method of claim 10,
And a rolling oil spraying part for spraying the rolling oil to the sides and outlets of each of the plurality of stands,
Wherein the continuous rolling mill is continuously rolling using the rolling oil. 13. The method of claim 12,
Wherein the rolling oil is a mineral oil-based rolling oil having a viscosity of 15 to 25 cSt (at 40 DEG C), a saponification degree of 40 mgKOH / mg or more, and a flash point of 250 DEG C or more. A joining portion joining the leading end of the preceding first plate and the leading end of the succeeding second plate, at least one of the first plate and the second plate being a titanium plate;
A continuous rolling mill having a plurality of stands sequentially aligned;
A reversing mill connected to the continuous mill; And
And a supply unit for supplying the bonded first and second plates to the continuous rolling mill,
The supplied plate material is continuously rolled in the continuous rolling mill and then reversibly rolled into the reversible rolling mill,
Wherein each of the four to six stands comprises at least one actuating roll, and the diameter of the actuating roll ranges from 130 mm to 150 mm. Sheet Cold Rolling Apparatus.

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