JPS60187488A - Press-welding device of composite material - Google Patents

Abstract

PURPOSE:To permit easy adjusting operation by making the respective diameters of a pair of work rolls different and enabling control of the draft in each slip simply by changing the peripheral speed thereof without of roll change. CONSTITUTION:A titled press-welding device for a composite material consists of means 1, 3 for supplying the 1st and 2nd strips 2, 4, a pair of work rolls 6, 5 which press-weld the strips 2, 4 supplied from said means and inserted therebetween in the superposed state and have different diameters and an accepting means 8 which accepts a composite material 7 press-welded by said rolls. The work roll 6 on the 1st strip 2 side is driven at the peripheral speed higher than the peripheral speed of the work roll 5 on the 2nd strip 4 side. The draft of the strip 2 is controlled smaller than the draft of the case in which the strips 2, 4 are press-welded at the same peripheral speed of the rolls 5, 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a composite material press-welding device for press-welding a first strip and a second strip together.

``Prior Art'' A conventional general pressure welding device for composite materials is equipped with a pair of work rolls of the same diameter that are rotated in opposite directions at the same circumferential speed, and a first strip of, for example, an alloy material is inserted between the work rolls. The strip and a second strip, such as a back metal strip, are inserted in an overlapping state, and the two strips are joined together by pressure applied by a pair of work rolls.

This pressure welding device does not have any problems as a general pressure welding device, but it did pose a problem, especially when manufacturing composite materials for bearings, in that the backing metal strip would undergo significant work hardening. .

In other words, in the above-mentioned pressure welding device, since the load per unit area applied to the alloy strip and the back metal strip by the pair of work rolls is equal, the rolling reduction rate of each strip is uniquely determined by the materials of those strips. When the material of the alloy strip for bearings is an aluminum alloy and the material of the back metal strip is a steel plate,
When the required total rolling reduction ratio is obtained, the rolling reduction ratio of the backing steel plate becomes larger than necessary, and a hard composite material is obtained as a whole.

Such hard composite materials not only make machining relatively difficult when manufacturing them as bearings;
It is difficult to obtain high roundness or straightness of the bearing,
Furthermore, the relatively large residual stress that remains inside the bearing after it is manufactured tends to easily deform the bearing, which has a negative effect on the bearing performance.

Conventionally, in order to improve these problems, a composite material was developed in which the diameters of the pair of work rolls were made different, with the work roll on the back metal strip side having a larger diameter and the work roll on the alloy strip side having a smaller diameter. A pressure welding device has been proposed.

According to such a pressure welding device, since there is a difference in the contact area of the work roll in contact with each strip, the load per unit area applied to the backing strip can be made smaller than the load per unit area applied to the alloy strip. ,
Therefore, when the required total rolling reduction is obtained, the rolling reduction of the backing strip can be kept relatively small to keep its work hardening small, thereby making it possible to obtain a soft composite material.

[Problems to be Solved by the Invention] However, in this pressure welding device, the rolling reduction rate of each strip mainly corresponds to the diameter of each work roll. It was necessary to change the diameter ratio, and the changing work was complicated.

"Means for Solving the Problems" In view of these points, the present invention makes the diameters of the pair of work rolls different, and the circumferential speed of the work roll on the second strip side is set to the first strip. The second work roll is driven at a speed greater than the circumferential speed of the work roll on the side.
A drive mechanism is provided for controlling the rolling reduction ratio of the strip to be smaller than the rolling reduction ratio when the first strip and the second strip are brought into pressure contact with the pair of work rolls at the same circumferential speed.

"Function" According to such a configuration, it is possible to control the rolling reduction ratio of each strip simply by changing the circumferential speed without replacing the work roll, which facilitates the adjustment work.

``Embodiment'' The present invention will be described below with reference to the illustrated embodiment. In FIG. 1, l is the back metal strip 2 as the second strip.
The supply reel 3 is a supply reel for the alloy strip 4 as the first strip, and the back metal strip 2 and the alloy strip 4 pulled out from each reel 1 and 3 are stacked on top of each other and placed between a pair of upper and lower work rolls 5.6. The composite material 7 is passed through and pressed by both work rolls 5.6 to form a composite material 7, which is then wound up by a take-up reel 8.

In the illustrated embodiment, the pair of work rolls 5.6 have the diameter of the work roll 6 on the back metal strip 2 side set larger than that of the work roll 5 on the alloy strip 4 side, and
They can be forcibly driven in mutually opposite directions at the same rotation speed by the same drive source 9.

In this way, when the diameter of one of the work rolls 6 is increased, the circumferential speeds of both work rolls 5.6 can be made different even if the number of rotations of both work rolls 5.6 is the same. side work roll 6
The circumferential speed of the work roll 5 on the alloy strip 4 side is made larger than that of the work roll 5 on the alloy strip 4 side.

Further, a backup roll 10 is provided on the back side of the small-diameter work roll 5, and the upper work roll 5 is connected to the lower work roll 6, which is pivotally supported for rotation only, via this backup roll 10 by a rolling down mechanism (not shown). is biased so that they are pressed together. Note that this backup roll IO is rotated by frictional force with the work roll 5.

In order to make the peripheral speeds of the pair of work rolls 5.6 different, each work roll 5.6 may be driven by an independent and separate drive source, or each work roll 5.6 may be driven at different speeds. Appropriate means can be used, such as providing a gear mechanism or the like in the system to make the rotation speeds of the two different, but in this embodiment, it is necessary to increase the circumferential speed of the work roll 6 on the side of the back metal strip 2. Both work rolls 5.6 are necessary and also to maintain the quality of the composite material 7.
It is desirable to maintain a constant circumferential velocity difference between.

Next, the effects of the present invention will be explained based on experimental results. Figure 2 shows four types of diameter ratios (hereinafter referred to as roll ratios) of a pair of work rolls 5.6 selected, and various peripheral speed ratios (hereinafter referred to as peripheral speed ratios) for each set of work rolls. Figure 3 shows the results of measuring the rolling reduction ratios of the alloy strip and the back metal strip in the composite material 7 obtained at different times. This is what is shown. In this experiment, a cold-rolled copper strip (5 pcc-s) with a thickness of 1.38+++ m was used as the backing strip 2, and 1
．． An aluminum alloy with a thickness of 40 mm was used. The composition of this aluminum alloy is, in weight percent, 20% Sn, 1% Cu, and the balance A1.

In Figure 2, the X mark indicates a roll ratio of 1.0, that is, the same diameter, the 0 mark indicates a roll ratio of 2.0, and the Δ and 0 marks indicate a roll ratio of 8.0 and 1O16. The work roll 6 on the back metal side has a larger diameter. Furthermore, Figure 2 shows the total reduction rate obtained by pressure welding by 40
It shows the rolling reduction ratio of each strip when converted to %, with the rolling reduction ratio of 40% being the boundary, the lower part is the rolling reduction ratio on the backing metal side, and the upper part is the rolling reduction ratio on the alloy side.

As can be understood from the experimental results shown in Figures 2 and 3, even if the roll ratio is constant, increasing the circumferential speed ratio lowers the rolling reduction on the backing metal side, thus reducing the degree of work hardening. can be done. Also, from the results of this experiment,
It is confirmed that when the roll ratio is increased with the circumferential speed ratio set to 1.0, the rolling reduction ratio on the backing metal side decreases. It is understood that when the circumferential speed ratio is increased for a steel sheet with a high thickness, the degree of reduction in the rolling reduction on the back metal side becomes remarkable, and a synergistic effect between the two can be obtained.

In the above embodiment, the supply reels 1 and 3 are used as supply means for supplying the back metal strip 2 and the alloy strip 4, respectively. For example, after each strip is rolled by a rolling machine, it is directly transferred to a pair of work rolls 5.
Of course, in the case where the rolling device is inserted between 6 and 6, the rolling device constitutes the feeding means. Similarly, in the above embodiment, the take-up reel 8 is used as a receiving means for receiving the composite material 7 pressed by the work rolls 5.6, but the composite material 7 is directly supplied to the bearing forming device. In this case, the bearing forming device constitutes the receiving means.

Furthermore, in the above examples, it is clear that if the roll ratio is less than 1, the opposite results to those described above will be obtained. Also,"
- In the above embodiment, two sheets of strips and strips are pressed together, but the invention is not limited to this, and the above experimental results also show good results in terms of improved adhesion strength.

"Effects of the Invention" As described above, according to the present invention, each rolling reduction ratio of the composite material can be controlled simply by changing the circumferential speed of a pair of work rolls. The adjustment work is easier than with conventional equipment, and since the diameters of the pair of work rolls are different,
The effect of being able to effectively control the rolling reduction ratio is obtained.

[Brief explanation of the drawing]

Fig. 1 is a schematic overall configuration diagram showing one embodiment of the present invention, Fig. 2 is a graph showing the relationship between the circumferential speed ratio and the rolling reduction rate, and Fig. 3 is a graph showing the relationship between the circumferential speed ratio and the hardness of the backing metal. It is a graph. l, 3... Supply reel 2... Back metal strip 4.
... Alloy strip 5.6 ... Work roll 0 7 ... Composite material 8 ... Take-up reel 9 ... Drive source t

Claims (1)

[Claims] A supply means for supplying a first strip, a supply means for supplying a second strip, and a first strip supplied from each supply means.
In the composite material pressure welding apparatus described above, the device includes a pair of work rolls for inserting a strip and a second strip in an overlapping state and pressing them together, and a receiving means for receiving the composite material pressure welded by the work rolls. By making the diameters of the pair of work rolls different and driving the circumferential speed of the work roll on the second strip side at a higher speed than the circumferential speed of the work roll on the first strip side, the second strip is rolled down. A composite device characterized in that it is provided with a drive mechanism that controls the rolling reduction rate to be smaller than the rolling reduction rate when the first slip I-slip and the second strip are brought into pressure contact with the pair of work rolls at the same circumferential speed. Material pressure welding device.