JPH05104262A - Apparatus for manufacturing laminated sheet - Google Patents

Abstract

PURPOSE:To restrain the expansion of a center part of the width of a roll by arranging cooling water passages in the inner part of the roll and cooling with gas-liquid two phases. CONSTITUTION:Plural cylindrical hollow parts 41 for heating medium having length to almost the whole width of the roll are arranged at near the surface of the roll 40 and the water as the heating medium 42 is filled and sealed. On the other hand, in the center part of the roll 40, the hollow part 43 for water cooling is arranged and by a rotary joint 44, supply/discharge of the cooling water is executed. The inner parts of the hollow parts 41 for heating medium come to upside or downside, but the gas phase and the liquid phase always coexist and the uniform heating of the roll can be obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a composite metal plate, in which a plurality of metal plates are continuously heated by a heating means and continuously fed between pressure-bonding rolls for bonding.

[0002]

2. Description of the Related Art There are various methods of manufacturing a composite metal sheet in principle, and one of them is called a lap rolling method. In this method, metal sheets are superposed and sent to a rolling mill to apply strong reduction to join them. This method is generally carried out without heating the material, or with a relatively low heating temperature, so-called warm. On the other hand, the present inventors have developed a new device centering on the heating means, and by heating it to a much higher temperature than in the past, it is possible to perform pressure bonding with a small reduction rate, and a composite material having excellent characteristics. It has been found that a metal plate can be manufactured (Japanese Patent Laid-Open No. 2-3076).
87).

As shown in FIG. 3, 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 current flows 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. For this reason, since the metal having the lower electric resistance generates less heat, when the heating is insufficient, the energizing roll 14 for auxiliary heating is provided and the current is supplied from the power source 23 to replenish the heat. The pressure bonding roll 4 is the work roll 4 in FIG.
A four-stage roll having two rolls A and two backup rolls 4B is shown, but the present invention is not limited to this, and may be two-stage or multi-stage having four or more stages.

FIG. 4 shows an apparatus for manufacturing a composite metal plate 5 from three metal plates 1, 2 and 3 according to the same principle as described above.
The energizing rolls 11, 12, 13 and the metal plate 1 are further provided with an energizing roll 16 for auxiliary heating.
5 are connected to each other. As a result, each metal plate 1,
2 and 3 are sent to the pressure bonding roll 4 while being heated.

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 does not have a current-carrying mechanism, which facilitates the design of this portion. It has features such as.
Further, since this apparatus has good uniformity of the heating temperature in the plate width direction and the temperature can be easily adjusted, it can be heated to a sufficiently high temperature for bonding if a gas shield means for preventing oxidation is provided.

[0006]

However, in the above-described apparatus for manufacturing a composite metal plate by electric heating, there is a problem that the pressure-bonding roll is deformed due to heat during operation and a thermal crown is generated in which the center of the roll width expands. .. For this reason, the central portion of the width of the pressure-bonded metal plate is subjected to a greater amount of compression than the end portions, and intermediate elongation occurs.

This is a problem caused by heating the above apparatus to a higher temperature than the conventional lap rolling method.
Furthermore, the part of the roll is charged by the heating power supply,
Since water leakage may occur, it cannot be cooled with water as is done in general hot rolling. Furthermore, there is a problem peculiar to this apparatus in that the use of water around the roll or the generation of water vapor itself raises the dew point of the gas shield atmosphere and adversely affects the oxidation prevention.

[0008]

Means for Solving the Problems The present invention is to solve the above-mentioned problems and comprises a heating means provided on a plurality of metal plates, and a pressure roll for continuously feeding the plurality of metal plates in an overlapping manner. In the manufacturing apparatus of the composite metal plate having
It is characterized by providing a pressure roll having a gas-liquid two-phase heat medium enclosed in one or more hollow portions having a length over the entire roll width and a cooling water passage for supplying and circulating water from the outside. is there. Further, the heating means comprises one or two or more energizing rolls provided on each of the plurality of metal plates, and a heating power source connected between the energizing rolls.

Further, the hollow portion is characterized by a cylindrical shape in which a plurality of hollow portions are arranged in the circumferential direction of the pressure-bonding roll with a certain distance from the surface of the pressure-bonding roll. Here, the length of the thinnest portion between the cylindrical hollow portion and the surface of the pressure roll is d (mm), and the rolling pressure to be applied to the pressure roll is P (kg / square millimeter). When this is done, the condition of Equation 2 is satisfied.

[0010]

[Equation 2]

[0011]

In the present invention, the problem of thermal deformation of the roll is solved by providing cooling means inside the pressure bonding roll.
In this case, in the rolling mill having the backup roll 4B such as the four-high rolling mill as shown in FIGS. 3 and 4, only the work roll 4A that is in direct contact with the heated metal plate may be the target of such countermeasures.

As means for cooling the inside of the roll with water, it is conceivable to provide a cavity inside the roll to feed water from the outside to cool the cavity. However, this is sufficient if the purpose is only to protect the roll itself from heat, but it is difficult to keep the degree of cooling in the roll width direction constant by this method. Therefore, it was found that the present invention is insufficient for the purpose of stabilizing the surface shape of the roll, which is the subject of the present invention.

On the other hand, as a technique paying attention to making the temperature distribution in the width direction of the roll uniform, there is one disclosed in JP-A-57-164931. This relates to the rolls used in the continuous annealing furnace for thin plates, but the inside is made hollow and the molten salt or heat transfer oil is enclosed in it to allow natural circulation or forcibly circulate by providing a rotary blade inside. Is. Although this roll serves the purpose of making the temperature distribution in the width direction uniform, cooling of the roll itself is not considered at all.

In the manufacturing process of the composite metal plate of the present invention, most of the heat of the material metal plate generated by electric heating is carried to the pressure-bonding roll. Therefore, unless some kind of cooling means is provided in the pressure bonding roll, the temperature rises remarkably and the durability of the roll becomes a problem, and it becomes necessary to provide another cooling means for the product after pressure bonding. Therefore, the above-mentioned JP-A-57-164931 is used.
The technology of the publication is not applicable.

As a result of various studies on suitable cooling means for the pressure-bonded rolls, the temperature distribution in the roll width direction is made uniform by circulating the gas-liquid two-phase heat medium enclosed in the rolls. It has been found that it is preferable to use a pressure bonding roll having a cooling water passage inside the roll.

In this pressure-bonding roll, a hollow portion is provided near the roll surface over the length of the roll body, and a heating medium such as water is enclosed therein under a pressure condition such that when the roll is heated, it becomes a gas-liquid two phase. To do. Further, a cooling water passage is provided inside the roll to circulate water through a rotary joint at the end of the roll.

When heat enters from the surface of the roll, the heat medium vigorously evaporates in the portion where the heat input is large, and the heat medium is converted into latent heat and the vapor easily moves to other portions. If the vapor moves to a portion having a relatively low temperature, it returns to the liquid phase and releases heat, so that the temperature distribution is equalized. On the other hand, in the portion near the center of the roll, water is also cooled by the supply of water from the outside, so that the temperature rise of the roll as a whole is suppressed.

The hollow portion for enclosing the heat medium may have various forms, but as a particularly preferable one, a cylindrical hollow portion having a length over the entire roll width is placed at a certain distance from the surface of the pressure-bonding roll. There are a plurality of pressure bonding rolls arranged in the circumferential direction. By providing a plurality of elongated hollow portions in this way, the reduction in the strength of the roll can be lessened than by providing a large annular hollow portion over the entire circumference of the roll. Therefore, the hollow portion can be provided relatively close to the roll surface, and the soaking effect can be increased.

FIG. 5 shows a part of a cross section of the pressure roll at right angles to the roll axis. As shown in FIG.
1 and the surface of the pressure-bonding roll 40, the rolling pressure P (kg
/ Square millimeter), the deformation is Δd (μm). Deformation of the roll causes deterioration of the plate shape, but it is about 3
Up to μm is allowed. The present inventors have found that the diameter of the hollow portion is about 12
As a result of analysis by the finite element method in mm, it was found that the deformation of the roll was within the above-mentioned allowable range if the expression 3 was satisfied. Therefore, the soaking effect of the rolling roll can be increased by reducing the dimension d as much as possible based on the rolling pressure applied to the pressure roll. For example P
Is 20 kg / square millimeter, d is 7 mm or more,
When P is 40 kg / square millimeter or more, d is 10 m
It means that the allowable range is m or more.

[0020]

[Equation 3]

When the pressure-bonding roll is applied to the above-mentioned apparatus for manufacturing a composite metal plate by electric heating, which cannot be cooled by being flooded with water due to the risk of electric leakage, the benefit is particularly large, but the heating means such as induction heating is different. Of course, it can be used in any case.

[0022]

1 and 2 show an embodiment of a crimping roll in an apparatus for producing a composite metal sheet according to the present invention. FIG. 1 shows a sectional view parallel to the roll axis, and FIG. 2 shows a sectional view perpendicular to the roll axis. ing.

In the vicinity of the surface of the roll 40, there are provided a plurality of cylindrical hollow portions 41 for the heat medium having a length substantially over the entire width of the roll 40. There is. On the other hand, a water cooling hollow portion 43 is also provided in the central portion of the roll 40, and a cooling water supply port 45 and a drain port 46 are connected by a rotary joint 44.

In this example, a plurality of heat medium hollow portions 41 are provided so as to be respectively sealed, so that the gas phase and the liquid phase are made to coexist in the same manner regardless of whether they are located at the upper part or the lower part by the rotation of the roll. be able to. Therefore, the uniform heat distribution of the roll can be similarly achieved in the lower roll having the heat source to the upper roll and the upper roll in the lower roll.

When this roll was used as a work roll of a four-high pressure rolling mill, there was no elongation (medium elongation) in the width center portion of the product composite metal as compared with the case where a mere internal water-cooled roll was used. The shape is very good.

[0026]

According to the apparatus of the present invention, in a device for feeding a metal plate heated to a high temperature by heating to a pressure bonding roll and performing pressure bonding, a gas-liquid two-layer heating medium is enclosed in a hollow portion having a length over the entire roll width. Since the roll is used, the heat can be made uniform over the entire width direction of the roll by the heat of vaporization of the heat medium and the circulation and condensation of the generated steam. Further, since the inside of the roll is water-cooled by supplying water from the outside, the whole roll can be cooled to an appropriate temperature. As a result, it is possible to suppress the generation of thermal crown, improve the shape of the product, control the cooling of the pressure-bonded composite metal plate while properly maintaining the roll temperature, and manufacture a product having good material characteristics.

[Brief description of drawings]

FIG. 1 is a cross-sectional view parallel to a roll axis of an embodiment of a pressure bonding roll in an apparatus of the present invention.

FIG. 2 is a cross-sectional view perpendicular to the roll axis of the embodiment of the pressure bonding roll in the apparatus of the present invention.

FIG. 3 is an explanatory view showing an example of an apparatus for manufacturing a composite metal plate of the present invention.

FIG. 4 is an explanatory view showing an example of an apparatus for manufacturing a composite metal plate of the present invention.

FIG. 5 is a partial cross-sectional view perpendicular to the roll axis for explaining the amount of deformation of the pressure roll in the apparatus of the present invention.

Claims (4)

[Claims] 1. A heating means provided on a plurality of metal plates,
In a manufacturing apparatus for a composite metal plate having a pressure roll in which the plurality of metal plates are continuously fed in an overlapping manner, a gas-liquid two-phase heat medium enclosed in one or more hollow portions having a length over the entire roll width. An apparatus for manufacturing a composite metal plate, comprising: a pressure roll having a cooling water passage for supplying and circulating water from the outside. 2. The composite according to claim 1, wherein the heating means comprises one or two or more energizing rolls provided on each of the plurality of metal plates and a heating power source connected between the energizing rolls. Metal plate manufacturing equipment. 3. The production of a composite metal plate according to claim 1, wherein the hollow part has a cylindrical shape in which a plurality of hollow parts are arranged in the circumferential direction of the pressure-bonding roll with a certain distance from the surface of the pressure-bonding roll. apparatus. 4. The length of the thinnest portion between the cylindrical hollow portion and the surface of the pressure roll is d (mm), and the rolling pressure to be applied to the pressure roll is P (kg / square millimeter). The composite metal plate manufacturing apparatus according to claim 3, wherein the condition of the expression 1 is satisfied. [Equation 1]