JPH02197384A - Production of vibration control steel plate - Google Patents

Abstract

PURPOSE:To continuously produce the non-resin type vibration control steel sheet having an excellent vibration control characteristic and joint strength by scanning steel sheets in the transverse direction thereof by an impulsive high-energy density beam in a nonoxidative atmosphere to intermittently melt the steel sheets and press- welding the steel sheets by a rolling roll in succession thereto. CONSTITUTION:While two sheets of the steel sheets 1, 1 are rolled down in the thickness direction by the rolling roll 4 on a table, the one steel sheet 1 is opened along the peripheral surface of the roll 4 on the inlet side of the roll to form a V-shaped aperture between the two steel sheets 1 and 1. The tangent of the two steel sheets 1, 1 deep in the V-shaped aperture is irradiated thereupon with the high energy density beam 5 from the open side while the part near the tangent is shielded by gas, such as Ar or He. A beam source 6 is capable of irradiating the range from one sheet end on the tangent to the other sheet end repeatedly back and forth with the impulsive beams of the prescribed periods. The vibration control steel sheet interspersed with welded parts 7 on the zigzag lines is produced if the steel sheets are successively rolled down in the thickness direction by the roll 4 while the steel sheets are intermittently melted by the impulsive beams generated from the beam source 6.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a non-resin-type vibration damping steel plate, and more specifically, to a method for manufacturing a non-resin-type vibration damping steel plate, and more specifically, it relates to a method for manufacturing a non-resin-type vibration damping steel plate, and more specifically, a continuous manufacturing method using a combination of irradiation with a high energy density beam such as a laser beam and rolling. Regarding the manufacturing method.

[Conventional technology]

In recent years, the introduction of vibration-damping steel plates has been considered in automobiles, home appliances, and the like to prevent noise and vibration. The damping rope plate that is currently the mainstream in development is a resin sandwich type in which a thin resin film 2 is sandwiched between the rope plates 1 and 1 as shown in Figure 5(a), and some of them are already in use. Now, practical application has begun. The damping principle is that the resin film 2 undergoes shear deformation during vibration and absorbs vibration energy.

This resin sandwich type vibration damping steel plate has excellent vibration damping properties, but since its properties are controlled by the physical properties (viscoelasticity) of the resin film 2, it is highly temperature dependent, and the resin must be changed depending on the usage environment temperature. There is a problem that cannot be solved. Further, the use of the resin film 2 results in a decrease in heat resistance and a lack of weldability.

A vibration-damping steel plate developed against the background of such problems is, for example, a powder composite type vibration-damping steel plate disclosed in [Tetsu to Hagane Lecture Summary Collection' 87-51500 J. As shown in FIG. 5(c), this damping steel plate is a non-resin damping steel plate in which metal powder 3 such as copper is sandwiched between steel plate 1.1 and metal powder 3. and are integrated by diffusion bonding. This vibration-damping steel plate, which does not use resin, naturally has low temperature dependence, excellent heat resistance and weldability, and also absorbs vibration energy by abrasion of free interfaces other than metal powder joints, making it suitable for resin sandwich inches. Shows vibration damping properties similar to mold vibration damping steel plates.

[Problems to be Solved by the Invention] However, conventional powder composite vibration damping steel plates are made by sandwiching metal powder 3 in a predetermined distribution between steel plates 1.1 cut out to a predetermined size, and then pressurizing the It is manufactured using a batch method in which it is inserted into a heating furnace. Therefore, the manufacturing cost is extremely high compared to the resin sandwich type damping #l plate for which a continuous manufacturing method has already been developed. Moreover, even if continuous production is performed, it is difficult to control the distribution of the metal powder 3, and even if continuous production is possible, the process will be complicated and a large cost reduction cannot be expected.

The present invention was developed in view of this situation, and it is an object of the present invention to continuously manufacture non-resin-type vibration-damping steel plates in a simple process, and to impart excellent vibration-damping properties to the manufactured non-resin-type vibration-damping steel plates. The purpose of the present invention is to provide a method for manufacturing a non-resin-type damping steel plate.

Means for Solving Problem C] In recent years, a method using a high energy density beam such as a laser beam has been developed as a method for joining steel plates.

For example, documents such as "38th Plastic Working Union Lecture (1987) Summary Collection P137-14o" disclose a method for manufacturing clad steel sheets that combines this beam irradiation and rolling. This steel plate joining method, as shown in Figure 6,
When cold rolling a steel plate 1.1 with rolling rolls 4, 4, the steel plates 1, 1 are opened in a ■ shape in front of the rolling rolls 4, 4, and the contact part at the back is rolled into a high energy density beam from the open side. It is heated at 5. The heated part is immediately heated by the rolling roll 4.4
is crimped.

In the joining method disclosed in the literature, the beam 5 is only irradiated linearly in the rolling direction, but if the beam 5 is moved back and forth in the sheet width direction at this time, the steel sheet 1.
The movements in the rolling direction are synergized, and the steel plates 1, 1 are seamed in a so-called zigzag shape.

At this time, when the beam is further irradiated intermittently, the steel 11.1 is partially welded with a constant density distribution as shown in FIG.

Steel plates joined in this way 1. When viewed as a damping steel plate, the steel plate 1.1 is integrated by partial joining, similar to the powder composite damping steel plate shown in ) in Fig. 5, and the damping properties of the steel plates 1 and 1 are are directly joined without the intervening metal powder 3, and the steel plates 1.1 are in direct contact with each other in the non-bonded portions, so it can be expected that it will have better properties than the powder composite damping steel plate.

That is, in the case of a non-resin damping steel plate, as mentioned above, the damping effect is obtained by absorbing vibration energy due to the friction of the free interface other than the joint, but in the case of a powder composite damping steel plate, the steel plate 1. Since the metal powder 3 is present between the steel plates 1 and 1, the adhesion between the steel plates 1 and 1 cannot be said to be good at the non-bonded portions.

On the other hand, if the steel plates 1 and 1 are directly joined by partial welding by a combination of beam irradiation and rolling, the steel plates l
.

Since there are no inclusions between the steel plates 1.1, the adhesion of the steel plates 1.1 in the non-joined areas is essentially high, and this adhesion is further enhanced by rolling with the rolling rolls 4.4, resulting in excellent vibration damping. The characteristics can be expected.

The manufacturing method of the present invention is a damping steel plate manufacturing method having the above-mentioned characteristics, and when rolling a plurality of steel plates with a rolling roll, the steel plate is opened in a V-shape in front of the rolling roll, and the steel plate is opened in a V-shape in front of the rolling roll. The method is characterized in that the tangential line is scanned in the width direction of the steel plate in a non-oxidizing atmosphere with a pulsed high energy density beam to intermittently melt the steel plate, and the molten portion is subsequently crimped with the above-mentioned rolling rolls. .

(Function) In the manufacturing method of this example, vibration-damping steel plates are continuously manufactured as rolling progresses. Since the steel plate is rolled down, the adhesion of the steel plate in the non-bonded parts is good, and it exhibits excellent vibration damping properties.

FIG. 1 is a perspective view illustrating an embodiment of the manufacturing method of the present invention, and FIGS. 2(a) and 2(b) are plan views of a damping steel plate manufactured by the method.

In the manufacturing method of the present invention, two steel plates 1.1 are rolled down in the thickness direction by a roll 4 on a table, while one steel plate 1 is rolled along the circumferential surface of the roll 1 on the roll entry side. is opened, and a ■-shaped opening is formed between the two rope plates 1.1. Then, the two steel plates 1 at the back of the V-shaped opening. l
A high energy density beam 5 is irradiated on the tangent line from the open side while shielding the vicinity with a gas such as Ar or He.

The beam source 6 is configured to be able to reciprocate and irradiate a range from one plate end to the other plate end on the above-mentioned tangent line with a pulsed beam having a predetermined period.

When the steel plates 1, 1 are rolled down in the thickness direction by the rolling rolls 4 while intermittently melting the tangential lines of the steel plates 1, 1 with pulsed beams from such a beam source 6, as shown in FIG. )
As shown in (b), a damping steel plate with welded parts 7 scattered on a zigzag line is manufactured.

Pitch of zigzag line in manufactured damping steel plate 11.
2□ and the pitch l of the welded portion 7 on the zigzag line, which is the plate width, is determined by the rolling speed VI, the frequency F of the pulsed beam, and the scanning speed v2 of the beam, and the relationship therebetween is as follows.

1+ = V+ x2L/Vg! □ - Determined by the stopping time of the beam oscillation at the plate edge. For example, if the stopping time is 1°, V and Xt are obtained (including 0).

L = V2/F Therefore, by selecting v, , v, F according to the plate width, lI, 27. I! , can be determined.

The important factors in the damping steel plate produced by the method of the present invention are the weld area A per weld and the ratio B of the area occupied by all the welds on the steel plate surface where the weld 7 is present. . These control the damping characteristics and bonding strength of the damping steel plate, both of which are mentioned above. +, lt, ls and the beam power. The preferred ranges of these factors are as follows.

The upper limit of welding area A is not particularly specified except as specified in B above. As for the lower limit, 0.1m" or more is desirable.
If the welded area A is less than this, there is a risk of peeling during rolling.

Area ratio B occupied by all welded parts: From the viewpoint of vibration damping properties, the smaller the better, but if the ratio is too small, satisfactory adhesive strength will not be obtained. A preferable range from the viewpoint of both vibration damping properties and adhesive strength is 0.5 to 20%.

The material and thickness of the steel plate are selected as appropriate and are not particularly stipulated.

〔Example〕

Next, the results of the present invention will be explained in comparison with the results of comparative examples.

Two cold-rolled steel plates with a thickness of ll1llll and a width of 900 om were joined by the method shown in Figure 1 under the conditions shown in Table 1,
A damping steel plate with a thickness of 2 mm was manufactured with a weld area A of 0.5+am' and an area ratio of 86.6% occupied by all welds.

A test piece with a width of 20 meters and a length of 220 meters was cut out from the manufactured damping steel plate, and its vibration energy loss coefficient and joint strength were investigated. The investigation results are shown in Table 2 along with the weld area A and the area ratio B occupied by the total weld area. In addition, 0.5aa between two thick cold rolled steel plates (veneer) and 1 inch thick cold rolled steel plates.
Table 2 also shows the investigation results for a powder composite damping steel plate in which copper powder of φ was interposed at a density of 2 g/m''.

In the figure, 1: steel plate, 4: rolling roll, 5: high energy density beam, 6: beam source, 7: welded part.

As is clear from Table 2, according to the method of the present invention, a damping steel plate can be manufactured continuously, and a damping steel plate having sufficient damping properties and adhesive strength can be obtained.

In addition, in the method of the present invention, as shown in FIG.
It is also possible to manufacture a non-resin damping steel plate made by laminating more than one steel plate.

〔Effect of the invention〕

As is clear from the above description, the method of the present invention can continuously produce non-resin-type vibration damping steel plates with excellent vibration damping properties and bonding strength through a simple process, thereby reducing the cost of this type of steel plate. It is highly effective.

[Brief explanation of the drawing]

Figures 1 and 3 are explanatory diagrams of embodiments of the present invention, Figures 2 and 4 are structural diagrams of damping rope plates manufactured by the method of the present invention, and Figure 5 is a conventional divided steel plate. Structure explanatory diagram, No. 6
The figure is an explanatory diagram of a steel plate joining method using a combination of high energy density beam irradiation and rolling. C) to

Claims (1)

[Claims] 1. When rolling multiple steel plates with a rolling roll, the steel plate is opened in a V shape in front of the rolling roll, and a pulsed high energy density beam is used to roll the steel plate width on the back tangent line in a non-oxidizing atmosphere. A method for manufacturing a vibration damping steel plate, characterized by scanning in a direction and intermittently melting the steel plate, and subsequently pressing the melted portion with the above-mentioned rolling roll.