JPH05387A - Production of composite metallic plate - Google Patents

Abstract

PURPOSE:To prevent the slippage in the transverse direction of the composite metallic plate which is liable to arise when the materials of metallic plates vary drastically by varying the widths of the metallic plates superposed adjacent to each other as the blank materials for the composite metallic plate from each other. CONSTITUTION:The widths of the metallic plates 1 and 3 and the widths of the metallic plates 2 and 3 vary as well in the case of production of the composite metallic plate by superposing three sheets of the metallic plates 1, 2, 3. The widths of the metallic plates 1, 2 on the front surface in this embodiment are the same and the width of the intermediate metallic plate 3 is narrower than therefrom. The ends B of the metallic plates 1, 2 on the front surface bends and the transverse movement of the intermediate metallic plate is thereby restrained. The meandering of the intermediate metallic plate is substantially prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite metal plate in which a plurality of metal plates are continuously heated by electric heating and continuously pressure-bonded.

[0002]

2. Description of the Related Art The present inventors have previously developed a method for producing a composite metal plate, that is, a clad material by continuously heating a plurality of metal plates in an inert atmosphere with electric current and press-bonding them with a press roll ( Japanese Patent Laid-Open No. 2-307687).

As shown in FIG. 2, this is a metallic plate 1,
2 is provided with energizing rolls 11 and 12, respectively, and a composite metal plate 5 is manufactured by feeding current between the energizing rolls and feeding them between the pressure bonding rolls 4 so that the metal plates of the raw materials overlap each other. The power supply 21 may be a low frequency AC power supply, a DC power supply, or the like. The electric current passes from one energizing roll 11 through the metal plate 1 of one material, through the portion of the pressure bonding roll 4 and through the metal plate 2 of the other material to the other energizing roll 12. That is, the current values of the metal plates 1 and 2 of each material are the same.

Since this method requires only a commercial frequency power source, the cost of electric equipment is significantly lower than that of high frequency heating, and the crimping device has no current-carrying mechanism, so that this part can be easily designed. It has features such as.
Further, a method in which two or more current-carrying rolls are provided on one metal plate developed by the inventors of the present invention and preheating is performed by supplying current also between them can cope with a wide range of plate thicknesses and material combinations. The material and accuracy of the product are excellent, and it is an excellent method for producing a clad material.

[0005]

By the way, a metal plate having a predetermined width is fed to a pressure roll with its edges aligned and pressure-bonded. It must be prevented as much as possible because it causes defects and waste of materials.

In the usual case, if a sufficient tension is applied to the metal plate, particularly large meandering does not occur at the pressure roll. However, it may be extremely difficult to prevent the meandering depending on the combination of the metal materials. In particular, when the materials of the raw metal materials are remarkably different, for example, in the case of joining an Al plate and a steel plate, meandering at the pressure roll is very likely to occur. That is, FIG. 3 shows a state in which the material is caught in the pressure bonding roll 4 in the case of manufacturing a three-layer clad material using the steel plates 1 and 2 on both surfaces and the Al plate 3 in the center. Since the Al plate is softer than the steel plate, if the deviation starts even slightly due to the meandering of the plate, the protruding portion A swells, which becomes an obstacle and it is extremely difficult to return to the original position.

As described above, if it is attempted to increase the tension to prevent the meandering, the Al plate in the vicinity of the pressure joining point rises in temperature due to the heat from the steel plate heated to a high temperature and its strength decreases, which may cause cutting. Is big.

Further, a method using a guide roll for width regulation is also a general means. That is, although FIG. 4 shows a case where a composite metal plate is made of three metal plates as shown in FIG. 3, a guide roll 31 is provided immediately before entering the pressure roll 4 to prevent the raw metal plate from meandering. However, since the strength of the metal plate entering the pressure bonding roll is lowered by heating, when the plate thickness is thin, sufficient pressing force cannot be given even if the metal plate is pushed by the guide roll. Moreover, in this method, since it is difficult to provide a guide roll for each metal plate, the energizing roll 11,
Power source 21 between 13 and power source 22 between energizing rolls 13 and 12
A part of the electric current of 1 is short-circuited before the pressure roll 4. Therefore, general metal rolls cannot be used, and ceramics or the like must be used.

[0009]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, in which one or two metal plates are provided for each metal plate.
In the method for producing a composite metal plate by providing the energizing rolls described above and continuously feeding between the pressure-applying rolls so that the plurality of metal plates are overlapped with each other while passing a current between the energizing rolls, the metal plates that are adjacently overlapped with each other. The method for producing a composite metal plate is characterized in that the widths of the metal sheets are different from each other.

[0010]

FIG. 1 shows an example of the method of the present invention and shows a case where a composite metal plate is manufactured by stacking three metal plates 1, 2 and 3. In this case, the widths of the metal plates adjacent to each other are made different from each other. That is, the widths of the metal plates 1 and 3 are different, and similarly, the widths of the metal plates 2 and 3 are also different. In this example, the widths of the metal plates 1 and 2 on the surface are the same, and the width of the intermediate metal plate 3 is narrower than these.

FIG. 1 shows a situation in which the metal plates 1 and 2 on the surface are steel plates and the metal plate 3 in the middle is an Al plate. However, since there is no metal plate at the end, the metal plate 1 on the surface is shown. The end B of No. 2 is bent, thereby restraining the widthwise movement of the intermediate metal plate. When three metal plates are pressure-bonded, the intermediate plate does not work due to the frictional force with the pressure-bonding rolls and is very easy to meander. However, by doing so, the middle plate is hardly meandered.

In this example, there is a soft plate in the middle and the width thereof is shortened, but the width of the soft plate is not necessarily made narrower than the width of the hard plate. FIG. 5 shows a situation in which the width of the soft metal plate is made larger than that of the hard metal plate. That is, a hard metal plate 1 and a soft metal plate 3
It shows a case of manufacturing a two-layer composite metal plate with. The end portion C of the soft metal plate 3 becomes thicker at the time of pressure bonding, and the movement of the hard metal plate 1 in the width direction can be restrained. If the widths of the metal plates adjacent to each other are different from each other, the effect of the present invention can be exerted regardless of the properties of the metal plates.

The difference in plate width depends on the difference in hardness of the metal plate of the material, which of the hard material and the soft material is to be widened, and the reduction rate of the pressure roll. However, it is necessary that the difference between the plate widths is 5 mm or more, and if it is less than this, the effect of preventing meandering is small. On the other hand, if the difference in plate width is larger than necessary, this part will reduce the yield and is uneconomical. When the width of the hard material is increased, it is necessary to take a sufficient difference in consideration of the width expansion of the soft material, but 40 mm or less on both sides is sufficient. On the contrary, when the width of the soft material is increased, a smaller difference may be set, for example, within 20 mm on both sides.

[0014]

【Example】

Example 1 In order to manufacture a three-layer composite metal plate having a 0.4 mm-thick steel plate as the surface material and a 0.5-mm-thick Al plate as the central material, the steel plate is 800 ° C. and the Al plate is 300 ° C. when energized. It was heated to ℃ and continuously crimped by a crimping roll.

When the width of all three metal plates was 250 mm, the central Al plate was severely meandered and the tension of the plates was increased to prevent this, but the Al plates were broken. Therefore, as shown in FIG. 1, the steel plates 1 and 2 are 280 mm wide and the Al plate 3 is
When the width was set to 250 mm, there was no meandering and good pressure bonding could be performed without particularly increasing the tension.

Example 2 A steel plate having a thickness of 0.4 mm and an Al plate having a thickness of 0.5 mm were used.
To produce a multi-layer composite metal sheet
The Al plate was heated to 0 ° C. and 300 ° C. and continuously pressure bonded by a pressure bonding roll.

When two metal plates were crimped with a width of 250 mm, the meandering was remarkable. Then, as shown in FIG. 5, when the width of the steel plate 1 was set to 250 mm and the width of the Al plate 3 was set to 270 mm, the meandering disappeared and good pressure bonding was achieved.

[0018]

EFFECTS OF THE INVENTION Since the widths of the adjacent metal plates of the composite metal plate that are adjacent to each other are different from each other, it is possible to prevent the shift in the width direction which is likely to occur when the materials of the metal plates to be combined are significantly different. be able to.

[Brief description of drawings]

FIG. 1 is a diagram showing a state of a material between pressure-bonding rolls in the method of the present invention.

FIG. 2 is a diagram showing a method for manufacturing a composite metal plate to which the present invention is applied.

FIG. 3 is a diagram showing a state of a material between pressure-bonding rolls in a conventional method.

FIG. 4 is a diagram showing a method of preventing meandering of a metal plate by a guide roll.

FIG. 5 is a diagram showing a state of a material between pressure-bonding rolls in the method of the present invention.

Claims (1)

Claim: What is claimed is: 1. A plurality of metal plates are provided with one or more current-carrying rolls, and a current is passed between the current-carrying rolls so that the metal plates overlap each other so that the metal plates overlap each other. The method of manufacturing a composite metal plate by feeding the composite metal plate to each other, the widths of the metal plates adjacent to each other being different from each other.