JPH02251301A - Method for rolling thin metallic plate - Google Patents

Abstract

PURPOSE:To easily prevent a plate from camber by making a main adjustment of plate camber with an upper and a lower work roll different from each other in roughness and Young's modulus to adjust the inclined angles of a thin metallic plate on the inlet and outlet sides of a rolling mill to the horizontal surface and to make a fine adjustment of the plate warpage. CONSTITUTION:When the thin metallic plate having difference in roughness between a surface and a back face is rolled, many plates camber to the side of a work roll rough in roll roughness. This is because the elongation on the side large in roll roughness is smaller than the elongation on the side small in roll roughness. The Young's modulus large in roll roughness is made higher than the Young's modulus small in roll roughness to relieve an ununiform plastic deformation in a roll bite in the direction of the plate thickness. The flatteness of the roll by rolling load is larger in the work roll low in Young's modulus than in the work roll high in Young's modulus. When the thin metallic plate is inclined and rolled, for example, the pass line on the outlet side is moved upward, the material is wound upward. Thus, adjustment operation composed of main adjustment and fine adjustment of the plate camber is easy and most of the plate warpage can be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for rolling a thin metal plate, and particularly to a method for rolling a thin metal plate having a difference in roughness between the front and back surfaces without causing warpage.

This invention is utilized for rolling thin metal plates such as stainless steel foils that have roughness differences between the front and back surfaces and are used in products such as automobiles, home appliances, building exteriors, and batteries.

[Prior art] When a thin metal plate used in products such as automobiles, home appliances, building exteriors, and batteries is subjected to treatments such as painting, soldering, and resin bonding, the surface to be subjected to these treatments is Roughness improves adhesion or adhesion of paint, solder, resin, etc.

Therefore, metal plates are manufactured in which the negative side is rougher than the other side. In manufacturing such a thin metal sheet having a difference in roughness between the front and back surfaces, the sheet may warp along the rolling direction depending on the material, dimensions, rolling conditions, etc. of the thin metal sheet.

If the sheet is warped, handling may be required when punching the thin metal sheet, the product may be out of dimension, or it may be out of size during photo-etching. Also, the board warps after resin bonding. Therefore, it is necessary to roll a thin metal sheet flatly without causing the sheet to warp.

By the way, it is reported in the literature (34th Plastic Working Union Lecture (1983) P. 10! that sheet warpage changes depending on the inclination angle (hereinafter simply referred to as inclination angle) of the sheet with respect to the horizontal plane at the entrance and exit sides of the rolling mill. !~112). The document also describes the influence of the diameters of upper and lower work rolls, rolling at different circumferential speeds, and the coefficient of friction under -L on sheet warpage.

[Problems to be solved by the invention] -Using the research results in Document F, it is considered that sheet warpage can be adjusted by changing the inclination angle, upper and lower work roll diameters, different circumferential speed rolling, and upper and lower friction coefficients. It will be done.

However, in the case of a raster rolling mill that rolls thin plates, when the pal line on the input and output sides of the strip is moved up and down significantly to change the inclination angle, the thin plate comes into contact with the housing and attached equipment of the rolling mill. Therefore, the inclination angle cannot be changed too much. Further, by performing rolling at different circumferential speeds, the warpage of the sheet can be adjusted to 5 degrees or less. However, in thin plate rolling, a phenomenon in which the lower work rolls come into contact with each other during rolling (kiss roll) occurs, so there is a limit to the adjustment of plate warpage by rolling at different circumferential speeds. Furthermore, it is also effective to change the roll diameter of the lower work roll, but since cluster rolling mills are driven by intermediate rolls,
Changing the diameters of the upper and lower work rolls basically results in rolling at different circumferential speeds. Therefore, there is a limit to adjusting the plate warpage by changing the diameters of the upper and lower work rolls.

Therefore, the present invention aims to provide a method for rolling a thin metal sheet that can eliminate sheet warpage even when the rolling mill is a cluster rolling mill.

[Means for Solving the Problems] The method of rolling a thin metal plate of the present invention mainly adjusts sheet warpage using upper and lower work rolls having mutually different Young's moduli.
Fine adjustment of sheet warpage is performed by adjusting the angle of inclination of the thin metal sheet with respect to the horizontal plane at the entrance and exit sides of the rolling mill.

To change the Young's modulus between the upper and lower work rolls, work rolls made of different materials are used.

High speed steel (for example, F e , C, C
r, W.

(components include Mo, V, etc.), ceramics (for example, Si, N4, Y2O3, Al2O3, etc.), cemented carbide (for example, VIC, Go, N
(with i etc. as a component) etc. are used. The direction and magnitude of sheet warp (radius of curvature) vary depending on the rolling conditions, so it cannot be stated unconditionally, but the rolling conditions (for example, the sheet thickness is about 50 μm, the rolling reduction is about In, the tension is about 5
0 to 60 kgf/mn+2) Therefore, the plate often warps toward the work roll, which has a rougher roll roughness. This is because the material undergoes non-uniform plastic deformation in the thickness direction within the roll bite, and the elongation on the side with greater roll roughness is smaller than the elongation on the side with smaller roll roughness. . Therefore, in such cases, by making the Young's modulus of the roll with larger roughness higher than the Young's modulus of the roll with smaller roll roughness, uneven plasticity within the roll bite in the thickness direction can be avoided. Deformation is alleviated. However, since the direction of sheet warpage differs depending on the rolling conditions, it is not necessarily necessary to use a roll material with a coarser roll roughness as one with a higher Young's modulus. It may be determined whether the Young's modulus of one of the roll materials of the lower work rolls should be increased by checking the warpage of the plate after rolling.

To fine-tune sheet warpage by adjusting the inclination angle, for example, if a rolled thin sheet warps concavely downward, increase the inlet side inclination angle, the exit side inclination angle, or both; move upwards. If it is concave on the upper side, move the thin plate downward on the entry or exit side.

[Function] A work roll with a low Young's modulus has greater roll flattening due to rolling load than a work roll with a high Young's modulus. Therefore, when considering plastic deformation in the plate Jff direction within the roll bite, the material on the work roll side having a high Young's modulus stretches more than the material on the work roll side having a low Young's modulus. As a result, the material warps toward the roll, which has a lower Young's modulus.

Furthermore, when a thin metal sheet is rolled at an angle, for example, if the pass line on the exit side is moved upward, the rolled material will be wound around the upper roll to some extent. At this time, since the exit speed of the plate is faster than the speed of the work roll, the material is subjected to compressive force in the wound portion.

Therefore, considering the plastic deformation within the roll bite, the material on the upper side has less elongation than the material on the lower side, so the material warps upward.

[Example] Stainless steel (S
us 3o4) The foil s was rolled. Cluster rolling mill 1
is composed of a work roll 2, an intermediate roll 3 and a backup roll 4.5.

The main specifications of the roll are as follows.

Work roll diameter: 35IiIl Material: High speed steel (E = 21000kgf/+++m'
) Ceramics (E = ioooookgf/m1I
l') Cemented carbide (E = 59000kgf/+nm2
) Roughness: Upper roll 2μtm R.

Troll 0, IJJIII Ra Side backup roll diameter: 170 mm Central backup roll diameter: 80 mm Intermediate roll diameter: 75 ous Roll body length: 400 mm The rolling conditions are as follows.

Rolling speed: lOa+-nin-' Back stretch 50kgf-Ilff+-2 Front stretch
60Jf-n+m-2 Inlet side plate thickness: 55um Outlet side plate thickness: 50μm Plate width: :]OO11a+ Lubrication: Neat Δ of mineral 1v1 lubricating oil? The inclination angle was adjusted by raising and lowering guide rolls 6 and 7 placed behind the face of the single-sliding cluster rolling mill 1.

Figure 2 shows the nail pressing results. Note that the entrance side inclination angle is 0, and the exit side inclination angle λ is indicated by the pass line height h at a position 1 m from the center of the cluster rolling mill 1.

2nd [As is clear from Z, it was not possible to prevent board warping in the conventional example in which the upper and lower work rolls were both made of the same material 11 of high speed steel.

On the other hand, in the case of the present invention, the warpage of the sheet could be largely adjusted by mutually changing the Young's modulus of the upper and lower work rolls. That is, when the upper work roll is made of ceramics and the lower work roll is made of high-speed steel, board warping can be prevented by setting the exit pass line height to about 0 mm. Further, when the upper work roll was made of cemented carbide and the lower work roll was made of high speed steel, sheet warping could be prevented by setting the exit side pass line height to about 15 mm.

[Effects of the Invention] According to the present invention, board warpage can be greatly adjusted by mutually changing the Young's modulus of the upper and lower work rolls. Therefore, even under pressure conditions that would cause a large warp of the board, warping of the board can be prevented. As a result, the present invention can be applied to a wide range of rolling conditions, and even if the rolling mill is a cluster rolling mill, sheet warpage can be eliminated. Further, in this invention, since the adjustment of the board warp consists of the main adjustment and the m31 adjustment, the work of adjusting the board warp is easy and the board warp can be almost eliminated.

[Brief explanation of drawings]

Fig. 1 shows an example of a rolling mill that implements the method of the present invention, and Fig. 2 is a schematic diagram of a cluster rolling mill, and Fig. 2 shows an example of the relationship between the inclination angle and sheet warpage using the work roll Young's modulus as a parameter. This is the line threshold shown. 1...Cluster rolling mill, 2...Work roll, 3
... intermediate roll, 4.5... backup roll,
6... Inlet guide roll, 7... Outlet guide roll.

Claims (1)

[Claims] 1. In a method of rolling a thin metal sheet using upper and lower work rolls with different roughnesses, main adjustment of sheet warpage is performed using upper and lower work rolls with different Young's moduli, and the horizontal plane of the metal thin sheet at the entrance and exit sides of the rolling machine is A method for rolling a thin metal sheet, characterized by finely adjusting the warp of the sheet by adjusting the angle of inclination.