JPH04255346A - Preparation of composite steel plate - Google Patents

Abstract

PURPOSE:To obtain a wide and thin composite steel plate having high peel strength and generating no release or wrinkles at the time of press processing by rolling respective superposed steel plates being skin materials to bond the same through the synthetic resin films provided to the contact surfaces thereof. CONSTITUTION:Two single coils 1, 2 are provided to payoff reels to be paid off and superposed one upon another to be taken up as a double coil 3. Next, this double coil 3 is subjected to cold rolling by a tandem stand to form a double coil 4 having predetermined thickness. Subsequently, the double coil 4 is separated to form two single coils and crystal particles with a particle size of about several 10-100mum mutually lodge in the mutual contact surfaces of the separated single coils 1, 2 to form rough surfaces. Next, the coils 1, 2 are annealed and plated if necessary and delivered so that the surfaces mutually brought to a contact state at the time of rolling in a superposed state are opposed to each other and subjected to degreasing treatment and chromate treatment and coated with a resin film to be dried to remove a solvent and bonded under pressure.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a composite steel sheet that has high peel strength and also enables the formation of thin and wide skin materials, which is difficult to do with current steel sheet manufacturing equipment.

0002

[Prior Art] Generally, in order to manufacture composite steel plates such as lightweight steel plates and vibration-damping steel plates, firstly, to produce the skin material which is the material for lamination, the skin materials are cold-rolled into predetermined shapes. The method used is to make a composite steel sheet by adjusting the thickness of the steel sheet, and then bonding the skin material, which has been annealed or annealed and plated as necessary, with a synthetic resin. However, in order to increase the peel strength after lamination, a method is also used in which the surface of the rolling roll is given an appropriate roughness and the roughness of the roll is transferred to the laminated surface of the skin material.

0003

[Problems to be Solved by the Invention] It is well known that the greater the surface roughness of a skin steel plate (skin material) that adheres to a resin, the higher its peel strength. However, the normal surface roughness as described above is a center line average roughness Ra of about 1 μm to about 2 to 3 μm. If you try to increase this roughness even further in order to improve the press working of products, you will inevitably need to increase the surface roughness of the rolling roll, but the roll surface roughness will wear out in a short time. For example, even if an attempt is made to roll several thousand tons with one roll, the actual productivity will be about 1/10 of that amount, which is a practical limit. In other words, the conventional method has a problem in that a composite steel plate with particularly high peel strength cannot be obtained.

[0004] The present invention has been made in view of the above-mentioned conventional problems, and aims to solve the above-mentioned problems by overlapping rolling of materials for skin materials.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides skin materials that are cold-rolled to a predetermined thickness and annealed or annealed and plated as required. In a method for producing a composite steel plate in which a skin material is attached via a synthetic resin film, each steel plate that is the material for the skin material is rolled in layers during cold rolling, and the overlap-rolled steel plates are rolled together in bonding. This is a method for manufacturing a composite steel plate in which the contact surfaces are adhered via a synthetic resin film.

[0006]

[Operation] In order to cold-roll the material for the skin material as described above, for example, by rolling two sheets on top of one another, the crystal grains of both steel sheets are mutually aligned on the surface where the steel sheets are in contact with each other. By sinking into the surface of the other steel plate, irregularities corresponding to the size of the crystal grains are formed on the rolling contact surfaces of both steel plates. The size of these crystal grains is usually several tens of micrometers to 100 micrometers.
Since the size is about μm, after over-rolling, the rolling contact surface of each separated steel plate has a size of about several μm to several tens of μm.
In other words, a roughness several times greater than that of the conventional method is formed. Therefore, if this rolling contact surface is adhered via a resin film, a composite steel plate with high peel strength and suitable for difficult forming processes can be obtained. Furthermore, since two steel sheets are stacked and rolled as one sheet, for example, as shown in Figure 3, which shows the relationship between sheet thickness and sheet width using current steel sheet manufacturing equipment, the thickness of the sheet can be rolled to 0.4 mm.
In terms of thickness, the maximum plate width is 1000 mm, but if two sheets are stacked and rolled to 0.8 mm, it is possible to separate them and obtain a plate with a thickness of 0.4 mm and a width of 1500 mm. This makes it possible to manufacture thin and wide composite steel sheets.

[0007]

EXAMPLES The present invention will be explained below with reference to the drawings and Table 1. FIG. 1 shows the steps (A) to (D) from cold rolling to annealing in the manufacturing method of the present invention, and FIG. 2 shows the next adhesion step.

First, two single coils 1 and 2 are prepared,
As shown in step (A), this is fed out onto a payoff reel and is rolled up as a double coil 3 by passing through each roll and overlapping on the way. Next, as shown in step (B), this double coil 3 is cold rolled using a tandem stand (three stands in the figure) to form a double coil 4 having a predetermined thickness. Next, in step (C), step (A)
By reversing the payoff reel and take-up reel in principle, the cold rolled double coil 4 is separated into two cold rolled single coils. This separated 1
In the process (B) of the heavy coils 1 and 2, the crystal grains of each steel sheet that are in contact with each other, each having a size of several tens of micrometers to 100 micrometers, sink into the surface of the other, resulting in crystal grains that are several times larger than before. A large roughness surface is formed. Next, in step (D), the coils 1 and 2, which have been annealed or successively annealed and plated as required, are each
o. 1 payoff reel and no. For example, coil 1 is placed on the top and coil 2 is placed on the bottom so that the surfaces with large surface roughness of each coil (the surfaces where the materials come into contact with each other during over-rolling...indicated by black triangle marks) are facing each other. Coil 1 is No. 1. 1 line, coil 2 is No.
．． After being degreased in a degreasing tank 5, chromate treated in a chromate treatment tank 6, and coated with a resin film in a coater in two lines, the solvent is dried in a drying oven 8, and then sent to a pressurized cooling device 11. No. 1 line and no. The two lines are combined here to form one line, and after the coil 1 and coil 2 are bonded and pressurized via resin, the exit side looper 12 and shear 13
After that, it is coated with anti-rust oil by an oiler 14 and wound onto a tension reel 15 to become a product. In the figure, reference numeral 9 denotes a resin film supply device, which supplies the pressurized cooling device 1 via the laminating device 10 when the coater 7 does not apply the resin.
1 is a method in which both coils are attached.

[0009]

[Table 1] Table 1 shows the manufacturing method according to the present invention and examples other than the present invention using specific implementation data. In the table, the invention in each example is an example of the present invention, the comparison is a comparative example other than the invention, the roughness of the bonded surface is the rough surface where the materials were in contact with each other during lap rolling, the light type is a lightweight steel plate, and the damper is a damping steel plate. shows. From this table, it is clear that the surface properties of composite steel sheets obtained by the method of the present invention are good. In addition, the TPS value is preferably 25 kg/mm or more for lightweight steel plates from the viewpoint of peeling during press forming, and desirably 15 kg/25 mm or more for damping steel plates from the viewpoint of wrinkles during pressing. . As the raw material before rolling, a low carbon steel hot rolled coil for JIS deep drawing mild steel plate SPCE and an unannealed coil obtained by cold rolling the same to an intermediate plate thickness were used.

Furthermore, in the present invention, two steel plates are stacked and cold-rolled as one sheet, so for example, only one sheet is rolled as shown in FIG. If it is rolled to a thickness of 0.4mm, the width of the plate is 1000m.
m is the limit, but if you stack two sheets and roll them to 0.8 mm, you can separate them and each sheet will have a thickness of 0.4 mm and a sheet width of 150 mm.
This means that one with a diameter of 0 mm will be obtained. In this example, 0
．． Even with a finished plate thickness of less than 4 mm, a wide material of 1100 mm or more was obtained in good condition.

[0011]

[Effects of the Invention] As explained above, according to the present invention,
Peel strength has increased, eliminating problems such as peeling and wrinkles caused by press forming, and it has become possible to manufacture thinner and wider composite steel sheets, making them suitable for use in difficult-to-form parts such as automobile panels, and railways. It can now be applied to large-sized parts such as vehicles. Furthermore, noise reduction and weight reduction have been achieved, making it possible to significantly expand the range of applications.

[Brief explanation of the drawing]

FIG. 1 shows the order of steps in the manufacturing method according to the present invention (A) to (
It is a figure shown by D).

FIG. 2 is a line configuration diagram for pasting a skin material cold-rolled by the method of the present invention.

FIG. 3 is a diagram showing the possible manufacturing range of the thickness and width of a damping steel plate.

[Explanation of symbols]

1. Material for skin material 2 Material for skin material 15 Composite steel plate

Claims (1)

[Claims] Claim 1: Manufacture of a composite steel plate in which skin materials are cold-rolled to a predetermined thickness, and skin materials that have been annealed or annealed and plated as required are attached via a synthetic resin film. The method is characterized in that during cold rolling, the steel plates serving as the material for the skin material are rolled in layers, and in bonding, the surfaces of the stacked steel plates in contact with each other are bonded via a synthetic resin film. A method for manufacturing a composite steel plate.