JP2003285112A - Method for cold rolling of titanium plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for rolling by which a titanium thin plate having small edge drops is produced with a conventional multistage rolling mill. <P>SOLUTION: Taper amount (ε) obtained by the following formula at a point (β) of a taper portion of intermediate rolls (2a, 2b) which corresponds to a passing position of the end of the titanium thin plate during rolling is adjusted to 0.15-3 mm, and a distance (EZ) from a position on a pass line which corresponds to a boundary between the taper portion of the intermediate rolls (2a, 2b) and a parallel part (8) of the roll to the edge of the titanium plate during rolling is adjusted to 70-120 mm, and then cold rolling is carried out with the multistage rolling mill. ε=(D-d)/2...(1) Wherein D: a diameter (mm) of the parallel portion of the intermediate roll d: a diameter (mm) of the taper portion of the intermediate roll which corresponds to a passing position of the end of the titanium plate during rolling. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention
Cold rolling of titanium sheet to produce small titanium sheet
About the method. [0002] BACKGROUND OF THE INVENTION Metal strips produced by cold rolling
The edge of the metal strip (width
At the edge in the direction)
You. Metal plate with edge drop
Cracks occurred during processing due to the effect of the reduced thickness
In some cases, defective product shape may occur. these
In order to avoid the occurrence of defects, some users
A plate that is strict in the thickness in the longitudinal direction and even in the width direction
Thickness tolerance is required. In order to meet this demand, after cold rolling,
Edge drop after processing such as continuous annealing and pickling
Edge trimming has been implemented to remove
The situation is worse now. For manufacturing titanium plate
Titanium is a very expensive material,
The reduction has led to higher costs. [0004] The edge drop which has the above-mentioned adverse effects
Is the conventional cold rolling method that can prevent
And various proposals have been made. Patent No. 304
In the invention disclosed in Japanese Patent No. 3186, the edge draw
As a method of preventing the occurrence of the
The elongated shape is a moderately elongated shape with a steepness of 1% or more and 3% or less.
A control method is disclosed. [0005] However, in order to carry out the present invention, during rolling,
It is essential to install a shape detector to detect the shape.
For rolling mills that do not have this method, this method can be applied.
No versatility. JP-A-11-179411, JP-A-11-179411
-179412 and JP-A-11-221605
In this case, a taper is applied to one end of the roll.
A mechanism to shift the crawl in the axial direction and a work roll
Edge of a plate using a rolling mill equipped with a crossing mechanism.
A di-drop control method is disclosed. These methods
Is the cross angle, shift amount and edge drop improvement effect
And the cross angle and shift amount with the plate shape
Based on the relationship, both edge drop and plate shape
How to control. However, each of these publications describes
The method includes a mechanism for shifting a work roll in an axial direction,
A rolling mill equipped with a mechanism for crossing work rolls
It can't be realized without it. In addition to the existing rolling mill,
Remodeling with the above mechanism requires significant capital investment
Becomes Also, a taper is provided at one end of the roll.
When cold rolling is performed with
The surface pressure on the steel plate at the boundary with the row part increases.
This has the adverse effect of transferring the pattern to the steel sheet surface. In Japanese Patent Application Laid-Open No. Hei 10-277614,
Rolls metal strips that require uniform thickness in the width direction
As a method, a cemented carbide with a thickness of 3% or more of the roll radius
Three (containing 50 to 88% by mass of tungsten carbide)
Discloses a method of rolling using a roll having a shaft fitted around a shaft core
Have been. However, this method also uses the roll itself.
This is very expensive and increases the production cost. JP-A-2-
No. 59104, in a 20-high rolling mill,
At least one set of upper and lower ends of the inter-roll is tapered,
Shift device for shifting the second intermediate roll in the axial direction
And profile control with bending equipment
A rolling mill is disclosed. However, in this rolling mill, a second intermediate roll is used.
A shift mechanism and a bending mechanism are provided. Existing
For the 20-high rolling mill, shift to the second intermediate roll and
Adding a vending mechanism requires a significant capital investment.
It will be inevitable. Thus, the conventional edge drop is prevented.
At present, it is necessary to modify the rolling mill
You. Here, even in the past, shape control was performed during rolling.
In this case, the shape is
The elongation rate of the part becomes a problem, and the wave height / wavelength of the surface of the rolled material
Is evaluated by the maximum steepness obtained based on
The edge drop to be controlled by the present invention
Is phenomenally different. [0012] SUMMARY OF THE INVENTION
The problem is that the conventional multi-high rolling mill can be
Titanium sheet with small edge drop when used as is
To provide a rolling method capable of producing
You. [0013] The present inventor has solved the above-mentioned problems.
As a result of repeated experiments to solve the problem, the following findings were obtained.
I came to. That is, the cooling of the titanium plate by the multi-high rolling mill
In cold rolling, it is provided in contact with the back of the work roll
One end of the roll as a middle roll is tapered
It is better to use a roll of
Position at the tapered portion of the intermediate roll that corresponds to the passing position of the
And the taper of the intermediate roll and the roll flat
Rolling from the position on the pass line corresponding to the boundary with the row
The distance to the edge of the titanium plate at the time is the edge drop
This has a great effect on the occurrence of The present invention has been made based on such findings.
The gist is as follows. "On the pass line
Two work rolls orthogonally and symmetrically arranged
And a work roll provided in contact with the back of each work roll.
And two intermediate rolls per roll.
Are axially shiftable and taper at their one end.
Tapered, and from the pass line
Roll end and pathr with upper intermediate roll taper
Roll end with intermediate roll taper below in
And the taper is opposite in the direction orthogonal to the pass line
Cold rolling on titanium plate by multi-stage rolling mill arranged
A method of performing rolling, in which the edge of a titanium plate is passed during rolling.
Over-position of at least one intermediate roll
The taper amount (ε) at the position at the part determined by the following equation
Is in the range of 0.15 to 0.3 mm.
Corresponds to the boundary between the tapered part of the inter-roll and the parallel part of the roll
From the position on the pass line to the edge of the titanium plate during rolling
Is adjusted so that the distance at
Cold rolling of titanium plate characterized by cold rolling
Rolling method. Ε = (D−d) / 2 (1) Here, D: diameter of the intermediate roll parallel portion (mm) d: Intermediate position corresponding to the passing position of the titanium plate edge during rolling
The diameter (mm) of the roll taper portion. " In the present invention, the titanium plate means pure titanium and titanium
An alloy plate shall be indicated. [0017] Embodiments of the present invention will be described below.
This will be described in detail. Rolling used in the cold rolling method of the present invention
The machine has an intermediate roll behind the work roll.
Any rolling mill may be used, and a typical rolling mill is 12-high rolling mill.
There are rolling mills and 20-high rolling mills. The most suitable 20 stage pressure below
A description will be given based on the rolling mill. FIG. 1 shows the arrangement of rolls of a 20-high rolling mill.
FIG. FIG. 2 is a sectional view of a 20-high rolling mill.
You. As shown in FIG. 1, the rolling mill
Two work rolls 1a, 1b arranged orthogonally and symmetrically
And the work provided in contact with these work rolls
Two intermediate rolls per crawl (hereinafter referred to as first intermediate
Rolls) 2a and 2b, each of the first intermediate rolls
Are provided with tapered tapers 6a and 6b at one end.
ing. As shown in FIG. 2, the titanium plate 7 (pass line
5) The end provided with the taper 6a of the upper intermediate roll 2a
Portion and taper 6b of intermediate roll 2b below titanium plate 7
Is opposite in the direction perpendicular to the pass line
It is arranged so that it becomes. Behind the first intermediate rolls 2a, 2b,
2 Intermediate rolls 3a and 3b are arranged, and furthermore
Behind them are backup rolls 4a, 4b
ing. This backup roll has a crown adjustment mechanism
The bearing shaft 4 has a plurality of bearings as shown in FIG.
Rings 4a1, 4b1 are fitted. Arranged behind the work rolls 1a, 1b
Intermediate rolls 2a and 2b can be shifted in the axial direction.
At a suitable position in consideration of the width of the material to be rolled.
You can shift. The present invention has been used in the prior art as described above.
Rolling mill can be used as it is. The present invention
In the cold rolling method, the taper amount (ε) is set to 0.15 to
0.3mm, taper part of intermediate roll and roll parallel part
During rolling from the position on the pass line corresponding to the boundary with
Limit the distance to the edge of the titanium plate to 70-120mm
The reason for this will be described. Such a limitation is all given its symmetry.
It is desirable to specify the intermediate roll of
At least one of them satisfies such a limitation
As far as possible, a certain effect is exhibited. Therefore, the book
The invention defines "at least one" intermediate roll. The taper amount is, as shown in FIG.
The surface of the intermediate roll corresponding to the passing position of the titanium plate edge 9
Is the taper amount (ε) at the position β in the
This is a quantity determined by equation (1). Ε = (D−d) / 2 (1) Here, D is the diameter (mm) of the intermediate roll parallel portion 8.
D corresponds to the passing position of the titanium plate edge 9 during rolling.
Diameter (mm) at the position β of the tapered portion of the intermediate roll.
You. The tapered portion of the intermediate roll is parallel to the roll.
Rolling from the position on the pass line corresponding to the boundary with the part
The distance to the edge of the titanium plate is as shown in FIG.
Corresponds to the boundary α between the tapered part of the intermediate roll and the parallel part of the roll
Between the position on the pass line and the titanium plate edge 9
Distance EZ. From the essence of the present invention, at least
It is sufficient if one satisfies the present invention.
Since the cross-sectional shape of the plate is symmetric, ε and EZ are four
It is preferable that all of the first intermediate rolls are the same.
In the following, the first intermediate roll 2a will be described.
However, other intermediate rolls are similarly specified.
It is assumed that The present inventor used the above-mentioned 20-high rolling mill to
To investigate the effect of taper amount on edge drop,
Prepare intermediate rolls with various taper amounts ε and perform rolling.
I got this. The reduction rate is fixed at 12.5%, and the distance shown in FIG.
Release EZ is fixed at 100 mm, and each first intermediate roll is fixed.
And rolled. FIG. 3 shows the taper amount ε obtained by this experiment.
It is a figure which shows the relationship between C25 (%). Here, C2
5 is the central thickness in the width direction of the steel sheet after cold rolling
(T) and the plate thickness (t at a position 25 mm from both edges)₁,
t_Two) As the percentage of the value obtained by dividing the difference from the average
is there. That is, it is obtained by the following equation. C25 (%) = [(T-TE) / T] × 100 Here, TE = (t₁+ T_Two) / 2. It is clear from the figure
As described above, when the taper amount ε is small, C25 increases.
In other words, it indicates that the edge drop increases.
You. If the taper amount ε is large,
Indicates that the edge is raised and the plate thickness is increased.
You. This is because the taper amount ε, ie, the taper
By selecting the appropriate taper amount, the edge drop
This shows that a thin titanium plate can be obtained.
In addition, C25, that is, from the plate edge,
The change in plate thickness at the position of 25 mm is large.
Has high anisotropy and three-dimensional deformation at the edge
Probably because it is big. Ratio of anisotropy Δr of steel and titanium
The comparison is as follows. Note that △ r is Δr =
｛(R₀+ R₉₀) / 2｝ -r₄₅Where r₀, R ₉₀, R₄₅Is
Runs at 0 °, 90 ° and 45 ° to rolling direction respectively
Represents the Kford value. [0031] Here, Δr of steel: −0.3 to 0.3 Δr of titanium: −0.5 to −0.6 Next, the distance EZ shown in FIG.
Tested for effect on edge drop
Was. In this test, the taper amount was fixed at 0.20 mm.
Then, cold rolling was performed at a rolling reduction of 12.5%. FIG. 4 shows the distance EZ obtained from the test and the sharpness.
This shows the relationship with the steepness (%). Here, the steepness is defined as
Measure the generated wave on the surface plate and divide the wave height by the wave pitch.
These values are expressed as percentages. As apparent from FIG. 4, when EZ is small,
And when EZ is large, the steepness is 1% or less.
It was on the upper side and became very unstable during cold rolling. This
When the EZ is changed, the deflection of the intermediate roll is different.
Therefore, it is necessary to select an appropriate value.
It turns out that 0 mm is a preferable range. [0034] EXAMPLES The effects of the present invention will be described based on examples.
You. The rolling mill used in this embodiment is shown in FIGS.
This is a conventional 20-high rolling mill. In this example, one portion of the coil after rolling is
At the tapered portion of the intermediate roll
At the position β was determined. Place of this example
In this case, each intermediate roll is symmetrically arranged, and
Measurement and calculation are not performed, but the same applies to other intermediate rolls.
The relationship is established. (Example 1) Sheet thickness 5 mm, sheet width 1560 mm
Of pure titanium hot rolled steel after annealing to remove oxide scale
And cold rolled in 6 passes to a thickness of 2.5mm
Was. The taper amount and the distance EZ during rolling are defined by the present invention.
Within the range. Table 1 shows the pass schedule for cold rolling,
Inlet side tension and exit side loaded during rolling for each pass
And the distance EZ are shown. After rolling, 25 m from the center and the edge in the width direction
The plate thickness at the position of m was measured, and C25 was obtained. The result
Table 2 shows the sheet thickness before rolling. [0038] [Table 1] [0039] [Table 2] As is clear from Table 2, the width after cold rolling
Thickness T at the center in the direction and the average of the position 25 mm from the edge
Difference from board thickness TE, T-TE is 0.012mm, C25 is
Obtain a very small edge-drop thin plate of 0.48%
I was able to. (Embodiment 2) 5 mm thick and 1560 mm wide
Of pure titanium hot rolled steel after annealing to remove oxide scale
And cold rolled in 6 passes to a thickness of 2.5mm
Was. The taper amount and the distance EZ during rolling are defined by the present invention.
Within the range. Table 3 shows the pass schedule for cold rolling,
The tension on the entrance side of the rolling mill and the exit side applied during rolling for each pass
And the distance EZ are shown. After rolling, 25 m from the center and edge in the width direction
The plate thickness at the position of m was measured, and C25 was obtained. The result
Table 4 shows the thickness before rolling. [0043] [Table 3] [0044] [Table 4] As is clear from Table 4, the width after cold rolling
Thickness T at the center in the direction and the average of the position 25 mm from the edge
Difference from plate thickness TE, T-TE is 0mm, C25 is 0%
A thin plate without edge drop was obtained. FIG. 5 shows the results obtained in Example 1 and Example 2.
Based on the measured thickness in the width direction of a thin titanium sheet
It is a figure showing a profile. Comparative example Annealed pure titanium hot rolled material with a thickness of 6 mm and a width of 1560 mm
Afterwards, it is pickled to remove the oxide scale and has a thickness of 3.24 mm.
Cold rolling was performed in 6 passes until the rolling was completed. Taper amount and distance EZ
Was rolled so as to be larger than the upper limit specified in the present invention.
Table 5 shows the pass schedule for cold rolling and rolling for each pass.
The tension on the entrance and exit on the rolling mill
And the distance EZ. After rolling, 25 m from the center and edge in the width direction
The plate thickness at the position of m was measured, and C25 was determined. as a result
Are shown in Table 6 together with the sheet thickness before rolling. [0048] [Table 5] [0049] [Table 6] As is clear from Table 6, the width of the base material
Between the center thickness T and the thickness TE at a position 25 mm from the edge
Difference, T-TE is 0.095mm, C25 is 1.63%
The resulting crown had a T-TE of -0.03 after cold rolling.
5mm, C25 is down to -1.09 and minus crown
changed. FIG. 6 shows the titanium sheet obtained in the comparative example.
Figure showing the profile based on the measured thickness in the width direction
It can be seen that the sheet is an edge-up thin plate. [0052] According to the method of the present invention, the conventional 20-stage pressure
No modification is required as it is as a rolling machine, and there is no effect on the steel sheet surface
Titanium sheet with small edge drop without giving
Can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic explanatory view showing the arrangement of rolls of a 20-high rolling mill. FIG. 2 is a sectional view of a 20-high rolling mill. FIG. 3 shows the taper amount ε and C25 (%) obtained by an experiment.
6 is a graph showing a relationship with the graph. FIG. 4 shows distance EZ and steepness (%) obtained as a result of the test.
6 is a graph showing a relationship with the graph. FIG. 5 is a graph showing a titanium sheet profile before and after rolling in an example of the present invention, wherein FIG.
(c) shows the profiles after rolling in Examples 1 and 2, respectively. 6 is a graph showing a titanium sheet profile before and after rolling in a comparative example. FIG. 6 (a) shows a profile before rolling, and FIG. 6 (b) shows a profile after rolling. [Description of Signs] 1a, 1b: work rolls 2a, 2b: first intermediate rolls 3a, 3b: second intermediate rolls 4a, 4b: backup rolls 5: pass lines 6a, 6b: taper ε: taper amount α: taper portion And the boundary of the parallel part

Claims (1)

Claims: 1. Two work rolls arranged orthogonally and symmetrically to a pass line, and two work rolls are provided for each work roll provided in contact with each work roll. A roll end provided with an intermediate roll, the intermediate roll being axially shiftable, having a tapered taper at one end thereof, and a tapered intermediate roll above the pass line; The roll end with the taper of the intermediate roll below the pass line, the cold rolling on the titanium plate by a multi-stage rolling mill arranged so that the taper is reversed in the direction perpendicular to the pass line. So,
The taper amount (ε) determined by the following equation at the position of the tapered portion of at least one intermediate roll, which corresponds to the passing position of the titanium plate edge during rolling, is in the range of 0.15 to 0.3 mm, and The distance from the position on the pass line corresponding to the boundary between the tapered portion and the roll parallel portion of the intermediate roll to the edge of the titanium plate during rolling is 70 to 120 m.
a cold rolling method for a titanium plate, wherein the cold rolling is performed while adjusting to be within a range of m. ε = (D−d) / 2 (1) where D: diameter of the intermediate roll parallel portion (mm) d: diameter of the intermediate roll taper portion corresponding to the passing position of the edge of the titanium plate during rolling ( mm).