JP3163925B2 - Manufacturing method of metal clad material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a clad material in which metal strips of different materials are heated and overlapped, and roll-joined by a rolling mill.

[0002]

2. Description of the Related Art A clad material in which different kinds of metal plates are joined together exhibits characteristics that cannot be obtained from a single metal plate, and thus has been used in various fields and its demand is increasing. For example, a clad material of aluminum, which is excellent in heat conductivity and lightweight, and stainless steel, which is excellent in corrosion resistance, is suitable for a cooker and the like.

As a method of producing a clad material suitable for mass production, there is a method in which two metal strips of different materials are heated, and they are continuously overlapped and roll-joined.

FIG. 2 is a diagram showing a production line for a clad material of aluminum and stainless steel which is generally used conventionally.

The aluminum strip 13 unwound from the uncoiler 16 and the stainless steel strip 14 rewound from the decoiler 17 are heated by a heating furnace 15 and roll-bonded by a rolling mill 11 to form a clad material. Examples of the heating means include heating by an electric furnace and induction heating. In such a production line, meandering occurs in the metal strip at the start of rolling joining or during rolling joining. When meandering occurs, meandering is corrected by tilting the coil reels 16 and 17 and the guide roll 18 immediately before the rolling mill, and centering during rolling is maintained.

[0006]

However, if meandering occurs at the start of rolling joining or during rolling joining, the above-mentioned coil reel type meandering correction method has a slow correction response, and the stripping in the heating device at the time of correction. Due to the non-uniform heating, a large temperature deviation occurs in the metal strip in the sheet width direction, and the temperature deviation caused by the heating continues until the time of rolling joining. In other words, when the meandering is controlled by the coil reel, when the meandering occurs, the metal strip travels slightly off the uniform heating zone in the heating device, and if the correction response is slow, a temperature deviation occurs in the metal strip. In addition, when the meandering is controlled by the guide roll immediately before the rolling mill, a temperature drop of the strip occurs due to heat removal by the guide roll, and a temperature necessary for joining may not be obtained,
Poor bonding results in different elongation rates between the bonded and non-bonded portions, resulting in further meandering, resulting in a temperature deviation of the strip and constriction. In this case, it is sufficient to increase the heating temperature in anticipation of heat removal by the guide rolls. When two types of metal strips having such a temperature deviation are roll-joined, the balance of the rolling pressure in the width direction of the roll in the roll gap becomes extremely non-uniform due to the temperature deviation, so that the high temperature portion of the metal plate is higher than the low temperature portion. This also causes a so-called drawing, in which the rolling load becomes large and the elongation percentage in the high temperature portion becomes large.

[0007] Therefore, if there is a time lag between the heating operation and the meandering adjustment operation, the length of the time during which the squeezing occurs during the rolling joining becomes long, which may result in breakage, resulting in a problem that the productivity is remarkably reduced. Even if it does not break, if the joining temperature is not uniform in the strip width direction, the peel strength of the product will not be constant, and the yield will decrease.

[0008]

The inventor of the present invention has conducted various experiments and studies to solve the above-mentioned problems. As a result, simultaneous heating and meandering correction minimized the temperature deviation in the sheet width direction caused by meandering. It has been found that as a result, the occurrence of drawing can be prevented, and a clad material having excellent peel strength can be obtained.

The present invention has been made based on the above findings.
The point of the gist is that `` in a method of heating metal strips of different materials and rolling and joining them with a rolling mill, the metal strips are wound around a heating roll at the entry side of the rolling mill and heated,
Detect the meandering of the metal strip and rotate the heating roll horizontally and / or
Others in to prevent the meandering of the metal strip roll-bonding method of a metal band and symptoms that roll joining "by tilting in the vertical direction.

[0010]

Next, the reason why the present invention is limited as described above and the operation thereof will be described.

FIG. 1 is an overall view of a rolling joining apparatus for carrying out the method of the present invention. A case of manufacturing a clad material of aluminum and stainless steel will be described.

A heating roll 5 having a meandering adjusting function for performing meandering adjustment and heating of the rolling mill 1, the clad material aluminum strip 3 and the stainless steel strip 4,
An aluminum uncoiler 6, a stainless uncoiler 7, which feeds an aluminum strip and a stainless steel strip at a predetermined speed, a clad coiler 9 for winding a clad material 8 at a predetermined speed, and a meandering detector 10
It has.

FIG. 3 is a longitudinal sectional view showing an example of an induction heating type roll used for carrying out the method of the present invention.

Outer roll shaft 22a and inner roll shaft 22b
The outer shell 21
Is rotatable. An induction coil 26 is provided at a portion of the inner shell 25 facing the outer shell 21,
The outer shell generates heat, the inside of the inner shell is hollow, and air is introduced from an air pipe 24 provided at the center of the roll shaft 22b to cool the inner shell.

FIG. 4 is a plan view of a heating roll provided with a meandering preventing device. The heating roll 21 is a generally used hydraulic cylinder 20 for preventing the metal band from meandering.
A mechanism for tilting in the horizontal direction is provided. In the figure,
The dotted line shows a state where the camera is tilted in the horizontal direction. In addition,
To prevent meandering, the roll may be tilted vertically, or may be tilted both horizontally and vertically.

The meandering is preferably detected at the entrance of the rolling mill, and can be detected by, for example, the photoelectric tube 10 or the like.

The reason why the metal band is wound around the heating roll as shown in FIG. 1 is to increase the contact area between the metal surface and the roll surface and improve the heating efficiency.

Next, the meandering is controlled by the heating roll at the same time that the metal strip is heated by the heating roll. When the metal strip meanders before or during rolling, the correction response is quick without a temperature drop by the guide roll. This is because the meandering adjustment can be performed so that the temperature in the width direction of the metal band does not become uneven. Also,
The meandering until the correction does not cause uneven heating because the strip meanders within the width of the heating roll.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments.

[0020] The rolling joining apparatus shown in FIG.
m A1100 aluminum strip with 500 mm width and 0.6 mm thickness SUS 304 with 500 mm width
450 and 480 ° C with stainless steel strip respectively
, And roll-joined by the rolling mill 1. During rolling joining, meandering was detected by the photoelectric tube 10, and meandering correction was performed by a commonly used control device (not shown), whereby rolling joining substantially free of meandering could be performed.

As a comparative example, aluminum and stainless steel having the above dimensions were joined by the apparatus shown in FIG. An electric furnace was used as a heating means, and the meandering correction was performed by a coil method without a temperature drop.

At the time of joining, a point 10 mm from the edge of the stainless steel strip and 25 m from that point on the entry side of the rolling mill.
The temperature was measured at five points at m intervals, and the temperature distribution in the plate width direction was examined.

FIG . 5 shows the results of temperature measurement.
You.

The measured value is a value measured immediately after the meandering occurs and the meandering adjustment is started.

FIG . 6 shows the peel strength of the joined clad material.
It is a diagram showing the result of the examination .

The peel strength test was conducted according to JIS Z 224.
7 was performed. When the peel strength is 20 N / mm or more
Is rated as good, it is not peelable (strong enough not to peel
The degree is large), and the bondability is sufficiently high.

As shown in FIG . 5, in the comparative example, the width
The temperature deviation is the same for both aluminum and stainless steel.
It is larger than the clear example. As shown in FIG. 6, the edge of the comparative example
The peel strengths at the two measurement positions on the sides are the same as those of the present invention.
Does not satisfy 20 N / mm or more, which is evaluated as good.
This is because, as shown in FIG.
The temperature deviation at the position is
Is also larger .

That is, it is shown that a uniform clad material can be manufactured in the width direction when the temperature deviation in the width direction is reduced.

[0029]

As is clear from the above description, by simultaneously heating the strip and suppressing the meandering,
A clad material having a uniform bonding strength in the width direction can be stably manufactured.

[Brief description of the drawings]

FIG. 1 is a diagram of a rolling joining apparatus for carrying out the present invention. FIG. 2 is a diagram of a conventional rolling joining apparatus. FIG. 3 is a view showing a longitudinal section of a processing roll. FIG. 4 is a diagram showing a meandering correction roll. FIG. 5 is a diagram showing a temperature distribution in the width direction of stainless steel and aluminum. FIG. 6 is a view showing a width direction peel strength distribution of a clad material.

[Explanation of symbols]

 1,11 Rolling device 2,18 Guide roll 3,13 Aluminum strip 4,14 Stainless steel strip 5, Heating roll 15 Heating device 6,16 Aluminum uncoiler 7,17 Stainless steel uncoiler 8 Clad material 9,12 Clad coiler 10 Meandering Detector

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-174791 (JP, A) JP-A-63-63519 (JP, A) JP-A-55-77927 (JP, A) JP-A-4- 187314 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 20/04 B21B 39/14 B21B 45/00

Claims (1)

(57) [Claims] In a method of heating and joining a metal strip of a different material by a rolling mill, the metal strip is wound around a heating roll on the entry side of the rolling mill, heated and meandering of the metal strip. A method of manufacturing a metal clad material, comprising detecting and tilting a heating roll in a horizontal direction and / or a vertical direction to prevent meandering of a metal band and perform rolling joining.