JP2868338B2 - Composite metal sheet manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art The present inventors have previously developed a method of manufacturing a composite metal plate, that is, a clad material by continuously heating a plurality of metal plates in an inert atmosphere and pressing them by a pressing roll ( JP-A-2-307687).

[0003] As shown in FIG.
The composite metal plate 5 is manufactured by providing current-carrying rolls 11 and 12 on each of the rolls 2 and feeding the material metal plates between the pressure-bonding rolls 4 so that the metal plates overlap each other while passing a current between the current-carrying rolls. As the power supply 21, any of a low-frequency AC power supply and a DC power supply can be used. The current passes from one energizing roll 11 through the metal plate 1 of one material, passes through the portion of the pressure roll 4, passes through the metal plate 2 of the other material, and reaches the other energizing roll 12. That is, the current values of the metal plates 1 and 2 of each material are the same.

In this method, since the power supply only needs to be of a commercial frequency, the cost of electric equipment is remarkably lower than high-frequency heating and the like, and since the crimping device does not have an energizing mechanism, the design of this part is easy. Etc.
In addition, a method in which two or more current-carrying rolls are provided on one metal plate developed by the present inventors and preheating is performed by energizing the metal-rolls during this time can also cope with a wide range of combinations of plate thicknesses and materials. The material and accuracy of the product are also excellent, and it is an excellent method for producing a clad material.

[0005]

However, depending on the combination of materials to be joined and joining conditions, ear waves may be generated, and the present inventors have pursued the cause. As a result, it was found that at both ends of the plate, the temperature drop due to the contact with the pressing roll was large, so that the deformation resistance at the time of pressing was non-uniform within the width of the plate and the shape was deteriorated.

Further investigations have revealed that the temperature of the material has been increased excessively due to the heat loss caused by the pressure rolls, even if the shape is not defective. That is, in order to perform the pressure bonding well, it is necessary to heat the material to a certain temperature or higher in accordance with the kind of the material, but it is necessary to heat the material to a temperature higher than the originally required temperature. In this method of manufacturing a composite metal plate, heating is performed only before the press roll enters the press roll, and there is a problem of heat transfer from the time the metal plate of the material comes into contact with the press roll to the end of press bonding.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been described in the art.
One or more energizing rolls provided, and energizing rolls
Crimping in which the plurality of metal plates coming out of the stack are sent in an overlapping manner
Roll and a heating power supply connected between the energizing rolls.
A composite metal sheet manufacturing apparatus, wherein at least one metal
Change the pass line between the energizing roll and pressure roll of the plate.
A composite metal sheet manufacturing apparatus characterized in that
You.

[0008]

In order to prevent heat from being taken away by the pressure roll before the pressure bonding is actually performed, there is a method of increasing the line speed as much as possible so as not to allow time for heat transfer. There is also a problem with abilities such as heating time, so there is naturally a limit. Therefore, the present inventors have considered a method in which the metal plate of the material does not contact the pressing roll as much as possible before being pressed by the pressing roll.

[0009] When the thickness of the composite metal sheet of the product is smaller than the total thickness of the material, that is, when the pressing is performed by the pressing roll, the material is pressed without first touching the pressing roll. Angles exist theoretically.

FIG . 3 is a view showing the limit angle, and the thickness T
_1, two material metal plates 1 of T ₂ is the composite metal plate 5 having a thickness t ₃ is crimped by crimping rolls 4. The point A between the pressure rolls, where the sheet thickness of the material is still maintained, is the pressure start point. As will be described later, since θ is extremely small, the material thickness t ₁ + t ₂ in the vertical direction here is actually Is substantially equal to the total thickness of the material, T ₁ + T ₂ . At this time, the relationship between the material entry angle θ and the angle with respect to the pressure roll pass line B holds as shown in FIG. Therefore, if the entry angle of the metal plate of the material is equal to or smaller than θ, the metal plate of the material does not touch the pressure roll until the moment of pressing.

[0011]

(Equation 1)

[0012] By the way and will be calculated by applying to the case of the actual the above conditions, the radius r of the roll is 70mm, _T 1 each plate thickness of the material metal plate, _{T 2,} ie, _t 1, _{t 2} is 0.5m
m, the thickness _{t 3} of the composite metal plate 0.9 mm, that is, θ when a reduction ratio of 10% by a press roll becomes only 2.2 degrees.

The present inventors have conducted experiments on the influence of the angle of entry of the material metal plate into the pressure roll under various conditions. However, it is not necessary to reduce the angle of entry so far. It has been found that remarkable effects such as improvement of the plate shape of the product can be obtained in the following manner.

If the angle is too small,
The position of the contact point between the metal plates of the material is not stable, and sparks are generated by slight plate vibration. For this reason, the joint surface becomes rough,
In the case of a metal having a low melting point such as Al, a hole was even formed, which proved to be a problem. Therefore, the angle with the other metal plate should be 3 degrees or more.

By the way, the reason why the angle of entry of the metal plate of the material into the pressure roll is set to 20 degrees or less depends on the equipment shown in FIG.
It is difficult to realize with the conventional one as shown in FIG. FIG.
Is the material entry angle α in the conventional composite metal sheet manufacturing equipment.
Is 15 degrees. That is, the apparatus is a device for making a double-sided clad material by combining three metal plates 1, 2, and 3. A heating power source 21, 2 is provided between each of the energizing rolls 11 and 13, and similarly between 12 and 13.
2 are connected. In this case, the intervals l ₁ and l ₂ of the pass lines of the respective metal materials are set to 1 due to the maintenance space and the like.
m is required. Then, the horizontal distance m between the energizing rolls 11 and 12 and the pressure roll 4 needs to be 3.7 m. With such a long length, the risk of occurrence of sparks due to the vibration of the plate described above increases, and the equipment of a gas shield for preventing oxidation of the plate becomes large.

The present inventors have found that a pass line changing roll may be provided between the energizing roll and the pressure roll as a means for solving this problem. FIG. 1 is a diagram showing an example of this, and shows an apparatus for manufacturing a composite metal plate from three metal plates as in the case of FIG. Are provided with pass line changing rolls 31 and 32, respectively. By doing so, the distance between the energizing rolls 11 and 12 and the pressure roll 4 can be reduced while keeping the metal plate entrance angles α ₁ and α ₂ small.

For example, in the case of FIG. 1, it is assumed that, as in FIG. 4, l ₁ and l ₂ are 1 m, and the pass line changing roll is located at the center of the horizontal distance between the energizing roll and the pressure roll. The angle of entry α ₁ , α ₂ of the metal plate into the pressure roll is 15
Degrees, angles β ₁ and β formed by the metal plate at the exit of the energizing roll and the horizontal
_{When 2 is set} to 40 degrees, the horizontal distance n between the energizing rolls 11 and 12 and the pressing roll 4 is about 1.8 m (an error due to the contact position of the metal plate with the roll is ignored). That is, it can be reduced to about half of 3.7 m in the case without the conventional pass line changing roll shown in FIG. Moreover, since the pass line changing rolls 31 and 32 are located between them, the vibration of the metal plate is extremely reduced.

By the way, if the pass line changing roll is provided between the energizing roll and the pressure roll, the problem of heat loss caused by the roll may be considered. However, there is no problem because the temperature of the plate is still low at the position of the pass line changing roll, and since the pass line changing roll does not require mechanical strength unlike the pressure bonding roll, a material having good heat insulating properties can be used. That is, the pass line changing roll can improve heat insulation by using ceramics as a material.

In the above case , it is only necessary that the angle is within 20 degrees of the square of the at least one metal plate and the pressure roll line. For example, when a composite metal plate is formed by combining two Al plates and a steel plate, since the heating temperature of Al is as low as 300 ° C., the temperature drop due to the pressure roll does not cause much problem. Therefore, the above condition only needs to be satisfied with respect to the entry angle of the steel sheet. Therefore, the manufacturing apparatus of the present invention
Between at least one energizing roll and pressure roll
If you provide a pass line change roll in the combination of material metal plate
May be sufficient.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The surface material 1 is used in the composite metal sheet manufacturing apparatus shown in FIG.
2 is a 0.4 mm steel plate, and 3 is 0.5 mm
A three-layer clad material having a width of 250 mm was produced from the Al plate. The diameter of the pressure roll is 140 mm, and the pressure is reduced by about 10% during pressure bonding.

The steel sheet of the surface material 1 and 2 by energizing heating 80
At 0 ° C., the center Al plate was heated to 200 ° C. so as to enter the pressure bonding roll 4. The results of manufacturing composite metal plates by changing the angle of entry of the surface materials 1 and 2 into the pressure rolls (the same angle between the metal plates) from 29 degrees to 2 degrees using the pass line changing rolls 31 and 32. Are shown in Table 1.

[0022]

[Table 1]

At a temperature of 29 ° C., in addition to a defective shape due to cooling at the end of the width of the sheet, a poor bonding strength due to insufficient temperature occurred. On the other hand, at a small angle of 2 degrees, sparks were generated due to instability of the contact position between the material metal plates, and surface flaws were generated. 15 approach angle
Good bonding was achieved at a temperature of 7 degrees.

[0024]

According to the present invention, the electric current is applied between the energizing rolls.
A composite metal plate that feeds a material metal plate to a pressure roll while heating
Between the energizing roll and the pressure roll
By providing a pass line change roll, the pressure of each metal plate
Since the angle of entry into the forming roll can be made smaller than before, it is possible to prevent or reduce the cooling of the material metal plate by contacting the pressing roll before the pressing start point. As a result, defective shape of the product and insufficient bonding strength can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a composite metal sheet manufacturing apparatus according to the present invention.

FIG. 2 is an explanatory view of a conventional composite metal plate manufacturing apparatus.

FIG. 3 is a diagram showing a positional relationship between a pressure roll and a material metal plate.

FIG. 4 is an explanatory view of a positional relationship between an energizing roll and a pressure roll when the method of the present invention is performed by a conventional device.

[Explanation of symbols]

 1, 2, 3 Metal plate 4 Crimping roll 11, 12, 13 Electricity roll 21, 22 Heating power supply 31, 32 Pass line changing roll

──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Toshifumi Miki 1 in Fujimachi, Hirohata-ku, Himeji-shi, Hyogo Nippon Steel Corporation Hirohata Works (56) References JP-A-61-137690 (JP, A JP-A-4-361882 (JP, A) JP-A-61-195789 (JP, A) JP-A-63-174791 (JP, A) JP-A-2-307687 (JP, A) JP-A-2- 200383 (JP, A) JP-A-60-177793 (JP, A) JP-A-57-25205 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23K 20/00-20 / 26

Claims (1)

(57) [Claims] 1. A method according to claim 1 , wherein one or two or more energizing rolls are provided on each of the plurality of metal plate passing paths, a pressing roll into which the plurality of metal plates coming out of the energizing rolls are fed in an overlapping manner, and an energizing roll. A composite metal plate manufacturing apparatus having a connected heating power supply, wherein a pass line changing roll is provided between at least one metal plate energizing roll and a pressing roll.