JPH0679792B2 - Composite pressure welding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of use" The present invention relates to a method for pressure welding a composite material in which a first strip and a second strip are pressure-welded.

"Prior Art" Conventionally, pressure contact is generally performed by inserting a pair of strips between a pair of pressure contact rolls that rotate in opposite directions at the same peripheral speed with a pair of strips superposed on each other. Both strips are joined together. However, in this pressing method, the rolling reduction ratio of each strip is primarily determined by the diameter of each pressing roll, that is, by the load per unit area of each strip, so the rolling reduction ratio of each strip is adjusted. In order to change the diameter ratio of the pressure roll,
The work was complicated.

Therefore, the inventor of the present invention has found that Japanese Patent Application Laid-Open Nos. 59-76686 and 59
No. 215286, the peripheral speeds of a pair of pressure contact rolls rotating in opposite directions are different from each other, and the first and second strips are inserted into the gaps of the pair of pressure contact rolls for pressure contact. We proposed a pressure welding method for composite materials.

According to such a pressure welding method, the rolling reduction of each strip in the composite material can be controlled by appropriately changing the peripheral speed of the pressure welding roll without changing the diameter ratio of the pressure welding roll. Therefore, there is an advantage that a required rolling reduction can be easily obtained. Further, according to this pressure welding method, it has been confirmed that a bonding strength equal to or higher than the bonding strength of each strip obtained by the conventional general pressure welding method can be obtained, and in particular, the ratio of the peripheral speeds of the pair of pressure welding rolls is increased. It has been confirmed that the joining strength increases.

[Problems to be solved by the invention] However, in such a pressure welding method, one strip is joined to the other strip in a stretched state, so that a large residual stress is generated inside the strip. As described above, it was found that the residual stress lowers the joint strength of both strips, although the joint strength tends to be larger than that of the conventional pressure welding method as described above.

"Means for Solving the Problems" In view of such circumstances, the present invention arranges rolling rolls rotating in opposite directions to each other on the downstream side of the pressure contact roll, and the pressure contact roll in the gap of the rolling roll. The composite material press-contacted with is inserted, and the composite material is subjected to skin pass rolling continuously to the press-contacting so as to remove the residual stress during the press-contacting.

"Function" When the composite material pressed by the pressing roller rotated at different peripheral speeds is further subjected to skin pass rolling, the large residual stress remaining inside the strip can be removed. Can be further increased.

[Embodiment] The present invention will be described below with reference to the illustrated embodiment. In FIG. 1, reference numerals 1 and 2 denote a first strip and a second strip drawn from the supply reels 3 and 4, respectively. After being wound around the roll 5, the pressure is applied to the gap between the pair of pressure contact rolls 5, 6,
The strip 2 is supplied from the supply reel 4 directly to the gap between the pair of pressure contact rolls 5 and 6.

The first strip 1 and the second strip 2 are pressed against each other by a pair of pressure rolls 5 and 6 to form a composite material 7. The composite material 7 is then inserted between a pair of rolling rolls 8 and the rolling rolls 8 are used. After the skin pass rolling, it is wound on the winding reel 9.

In the illustrated embodiment, the pair of pressure contact rolls 5 and 6 are provided with respect to the second strip 2 with respect to the pressure contact roll 5 on the first strip 1 side.
The pressure roller 6 on the side is set to have a large diameter, and the same driving source 10 can be forcibly driven in opposite directions at the same rotation speed. Thus, when the diameter of one of the pressure contact rolls 6 is increased, the peripheral speed of both pressure contact rolls 5 and 6 can be made different even if the rotational speeds of both pressure contact rolls 5 and 6 are the same. Roll 6
The peripheral speed on the side is higher than the peripheral speed on the side of the first pressure contact roll 5.

Further, of the pair of rolling rolls 8, one rolling roll 8 is interlocked with the driving source 10 or another driving source (not shown), and the feeding speed of the composite material 7 fed from the pair of pressure contact rolls 5 and 6 is fed. It is designed to rotate at a faster peripheral speed. On the other hand, the other rolling roll 8 is simply rotatably supported and rotated by the frictional force with the composite material 7.

By the way, a tension is applied to the first strip 1, the second strip 2 and the composite material 7 by an appropriate tension applying means (not shown) so that the pressure contact rolls 5 and 6 and the first strip 1 and the second strip 2 are connected to each other. It is desirable that substantially no slippage occurs, and in the above-described embodiment, since the first strip 1 is wound around the pressure contact roll 5, particularly, the first strip 1 and the pressure contact roll 5 are not wound. It becomes easy to prevent slippage between them.

On the other hand, the second strip 2 can be supplied to the take-up reel 9 without being substantially wound around the pressure contact roll 6, that is, conveyed from the supply reel 4 to the take-up reel 9 in a substantially straight line. With such a configuration, even if the second strip 2 has a large thickness and is difficult to bend like the first strip 1, it can be easily used for pressure welding. There are advantages. On the other hand, however, preventing substantial slippage between the second strip 2 and the pressure contact roll 6 is relatively large compared to the case where the first strip 1 is wound around the pressure contact roll 5. In order to prevent slippage, it is necessary to apply a relatively large forward tension to the composite material 7 sent out from the pressure rolls 5, 6.

In order to improve such a problem, as described above,
The peripheral speed of the rolling roll 8 arranged in front of the pressure contact rolls 5 and 6 is set to be higher than the delivery speed of the composite material 7 delivered from the pressure contact rolls 5 and 6, whereby front tension is applied to the composite material 7. I am trying to do it. Thereby, the tension applying means for applying the forward tension to the composite material 7 is omitted,
Alternatively, the load on the tension applying means can be reduced. And the peripheral speed of the rolling roll 8 is
The neutral point between the pressure contact rolls 5 and 6 and the strips 1 and 2 may be determined within a range that does not deviate from the pressure contact section of the strips 1 and 2 on the pressure contact rolls 5 and 6.

Next, the effects of the present invention will be described based on experimental results. FIG. 2 is obtained when the ratio of the peripheral velocities of the pair of pressure contact rolls 5 and 6 (hereinafter referred to as peripheral velocity ratio) is variously changed, and further the reduction ratio applied by the pair of rolling rollers 8 is variously changed. It shows the result of measuring the bonding strength of each strip 1, 2 in the composite material 7 to be produced.

In this experiment, a strip of industrial pure aluminum (A1100) having a plate thickness of 0.58 mm and a plate width of 50 mm was used as the first strip 1, and a steel plate having a plate thickness of 0.71 mm and a plate width of 50 mm was used as the second strip 2.
SPCC was used. Further, the front tension pulling the composite material 7 to the front side in the moving direction is set to 900 kgf, and the rear tension pulling the first strip 1 to the back side in the moving direction is set to 300 kgf, and the second strip 2 is pressed in the free state. It was supplied between 5 and 6. Further, the diameter of the small-diameter pressing roller 5 is set to 50 mm, and the diameter of the large-diameter pressing roller 6 is set to 300 mm so that they can be driven at the same number of revolutions. Further, as described above, the rolling roll 8 which is interlocked with the drive source is set to be faster than the feeding speed of the composite material 7 within the range where the neutral point does not deviate from the pressure contact section.

In FIG. 2, a curve A shows the joining strength when the skin pass rolling is not performed by the rolling roller 8, and curves B, C and D show the rolling reductions of 0.5%, 1.5% and 2.0, respectively.
It shows the bonding strength when it is defined as%.

In each of the curves A to D in FIG. 2, the joining strength increases as the peripheral speed ratio increases, and therefore the pair of pressure contact rolls 5 and 6 are joined.
It is understood that, when the peripheral speed ratio is different and the pressure welding is performed, a larger bonding strength tends to be obtained as compared with the conventional general pressure welding in which the peripheral speed ratio is 1 even without rolling. In addition to this, by further performing the skin pass rolling by the rolling roller 8, it becomes possible to further increase the bonding strength as compared with the case where the rolling is not performed. In addition, the range of the reduction rate when performing the above-mentioned skin pass rolling is preferably a range of the reduction rate from a small reduction rate to about 5%, and when the reduction rate is too large, the residual stress cannot be removed smoothly, The joint strength cannot be increased.

FIG. 3 shows another embodiment of the present invention. In this embodiment, the composite material 7 pressed by the pair of pressing rollers 5 and 6 is wound around the pressing roller 6, and the pressing roller 6 is further rolled. The composite material 7 is skin-pass-rolled by using this and the rolling roller 8.

With such a configuration as well, the pair of pressing rollers 6 and the rolling roller 8 are attached to the composite material 7 pressed by the pair of pressing rollers 5 and 6.
It is obvious that skin pass rolling can be performed with and.

[Advantages of the Invention] As described above, according to the present invention, it is possible to further increase the bonding strength of each strip in the composite material.

[Brief description of drawings]

FIG. 1 is a schematic overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a graph showing the relationship between the peripheral speed ratio and the bonding strength, and the relationship between the rolling reduction and the bonding strength, and FIG. It is a general | schematic whole block diagram which shows the other Example of this invention. 1 ... First strip, 2 ... Second strip 5,6 ... Pressing roll, 7 ... Composite material 8 ... Rolling roll

Claims (1)

[Claims] 1. A composite material in which the peripheral speeds of a pair of pressure contact rolls rotating in opposite directions are different from each other, and the first strip and the second strip are inserted into the gaps of the pair of pressure contact rolls to press the strips together. In the pressure welding method, the rolling rolls that rotate in mutually opposite directions are arranged on the downstream side of the pressure welding rolls, the composite material pressed by the pressure welding rolls is inserted into the gap of the rolling rolls, and the pressure welding is performed on the composite material. A method for pressure-bonding a composite material, which comprises continuously performing skin pass rolling to remove residual stress during the pressure-bonding.