JPH0626882B2 - Method of manufacturing conductivity-imparting composite metal plate - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to the production of a conductivity-providing composite metal plate, and more specifically, by laminating a conductivity-providing adhesive resin in the middle of two metal plates. And a method for producing a composite metal plate having excellent conductivity.

(Prior Art and Problems to Be Solved) In recent years, as awareness of noise has increased, various measures have been taken in order to prevent noise generated from various machine tools or other members.

In such a situation, it is known that a vibration-damping composite steel plate in which a damping resin having vibration damping performance is arranged in an intermediate layer is effective for a portion where the steel plate is used.

On the other hand, the vibration-damping composite steel sheet has a major drawback that resistance welding such as spot welding cannot be performed because the vibration-damping resin of the intermediate layer is an electric insulator. Therefore, as a method of imparting conductivity to the vibration-damping composite steel sheet, a mixture of a conductive filler (fibrous or granular metals) in a gel or liquid resin or a resin film is supplied to one side of two steel sheets. Or temporary bonding, and then main bonding is performed by a thermocompression bonding roll (main bonding roll) and laminated.

However, in order to ensure stable spot weldability as the conductive composite steel sheet, the filler mixed in the resin or the resin film must be evenly dispersed in the laminated area after lamination. However, the above-mentioned lamination method has a problem that the distribution becomes non-uniform and the weldability becomes unstable.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks of the prior art and to provide a method for producing a conductivity-providing composite metal plate having excellent conductivity and stable weldability and adhesive strength.

(Means for Solving the Problems) As described above, the instability of the weldability in the conventional laminating method is due to the following causes.

First, when continuously manufacturing a composite steel plate composed of a conductive resin and two steel plates, the resin and the two steel plates are firmly bonded, and the desirable function of the resin is combined. It is important to be exerted on the steel plate.

Since the joint strength between the resin and the steel sheet and the characteristics of the resin itself are largely controlled by the heat history received during the production of the composite steel sheet, the pre-bonding, the main bonding, and further the slow cooling after the main bonding during the manufacturing. It is necessary to set and manage the heat history strictly. In addition, at the time of main bonding, it is necessary to press the resin and the two steel plates between the two main bonding rolls with an appropriate pressure.

In particular, inflow of air into the steel sheet during the main bonding must be absolutely avoided in order to produce a sound composite steel sheet, and for that purpose, an appropriate amount of resin pool (hereinafter referred to as "resin" It is necessary to generate a bank).

However, the temperature of the steel sheet and the resin at the time of the main adhesion are, as viewed from the resin side, above the glass transition point and under the condition of having sufficient fluidity. The resin is transferred. In this respect, in the conventional laminating method, since there is no constraint, it is unavoidable that the resin bank flows nonuniformly in the width direction, and therefore a large amount of filler is gathered on the surface of the molten resin bank. As a result, the filler density in the stack is biased, especially the density on both sides of the stack width is reduced, and the weldability becomes unstable.

FIG. 1 shows a situation in which the resin banks are non-uniformly formed in this way. Two steel plates 3 and 4 are continuously supplied between a pair of main bonding rolls 1 and 2, and at the same time, Steel plate 3
The composite resin sheet 8 is manufactured by continuously adhering the electroconductivity-imparting adhesive resin film 5 to the main adhesive while continuously supplying it through the front bonding roll 6, and the resin bank 8 generated flows in the width direction as shown in the drawing. , Both sides are greatly eccentric in the width direction.

For this reason, the present inventor has conducted intensive studies on measures for stabilizing the flow of the resin bank, and as a result, when supplying the conductivity-imparting adhesive resin to the main adhesive roll, a plurality of threads or strips are supplied. The present invention is based on the finding that the resin bank can be stably generated in the width direction by supplying the air flow.

That is, the present invention is to provide a conductivity-imparting composite metal by continuously supplying a film-like, gel-like or liquid conductivity-imparting adhesive resin between upper and lower two metal plates, and thermocompressing and laminating with a heat roll. When manufacturing a board, by laminating two or more yarns or strips on the front surface of the heat roll or main adhering while replenishing an air flow, it is possible to stabilize the flow of the resin bank generated during the main adhering and stack them. The gist is a method for producing a composite metal plate having conductivity.

The present invention will be described in more detail below.

(Function) In the thermocompression bonding with the main bonding in the continuous manufacturing process of the composite steel sheet, as shown in FIG. 1, the resin bank has an unstable central part and large both sides, which easily flow and flow out. Therefore, the filler flows out, making the spot weldability unstable.

On the other hand, the present invention is to take measures to suppress the flow behavior of the resin bank generated at the time of the main bonding as much as possible in the process of manufacturing the conductive composite metal plate to which stable conductivity is imparted.

That is, the first means is a method of replenishing and inserting a plurality of threads or strips into the steel plate on the opposite side or the same side into the main bonding roll portion, and the second means is a method of supplying an air flow.

First, the first means will be described.

When manufacturing the composite steel sheet, as shown in FIG. 2, first, of the two steel sheets 3 and 4, the conductivity imparting adhesive resin film 5 is pre-bonded (temporarily bonded) to the steel sheet 3 on one side.
At this time, the steel plate needs to be heated to a temperature at which it is attached to the steel plate by suppressing the resin with the front bonding roll 6. The one steel plate 3 to which the resin is pre-bonded advances to the main bonding rolls 1 and 2, and is joined with the other steel plate 4. At the time of main bonding, the resin 5 receives a pressing force via the steel plates by the two main bonding rolls 1 and 2 facing each other set at a predetermined roll determined from the resin film thickness of the composite steel plate,
The temperature is raised to the set main bonding temperature. At that time, as described above, in order to avoid the inflow of air into the steel plate during the main bonding, an appropriate amount of resin bank must be present on the front surface of the main bonding roll, but if there is no restraint, it will pass through the main bonding roll. At times, the resin bank 8 moves in the plate width direction.

To control the movement of such a resin bank,
In the present invention, as a first means, the yarn or the strip 9 is replenished by the feeder 10 from the front bonding roll portion or the main bonding roll portion in the vicinity of the resin film. In Figure 2,
The supply line shown by the solid line is a mode in which the yarn or the strip 9 is directly supplied from the main bonding roll portion, and the supply line shown by a dotted line is a mode in which the line or the strip 9 is supplied through the front bonding roll 6. Of course, it is also possible to supply the thread or the strip 5 from the opposite steel plate 4 side.

The thread or strip 5 to be supplied may be of any material or property having a melting point or glass transition temperature higher than the use temperature and being easily flattened under pressure during the main bonding, such as glass wool or carbon. Examples thereof include fibers, born fibers, heat-resistant resin fibers, strips thereof, metal fibers, and twisted yarns. As a matter of course, as the thread of the conductivity-imparting adhesive resin to be permanently adhered, a film or a band can be used.

As a result, the flow behavior of the molten resin bank 8 can be easily controlled, so that the flow of the resin bank 8 to both sides is stopped, the outflow is prevented, and the entire surface is uniformly generated and stabilized. Therefore, the deviation of the filler is also caused. Instead, it can be uniformly distributed and stabilized.

It should be noted that the yarns or strips to be supplied may be appropriately determined in position, interval, number, etc. according to the generation status of the resin bank, and may be supplied. It is preferable to replenish.

Next, the second means will be described.

Instead of replenishing the thread or the strip as in the first means described above, as shown in FIG. 3, a gas supply device 11 is used to supply an air flow from the front of the main adhesive rolls 1 and 2 to the vicinity of the resin film. Also by doing so, the movement of the resin bank 8 in the plate width direction can be suppressed. In this case, compressed air or the like can be used as the gas, and the gas supply position, direction, pressure, etc. are appropriately determined according to the generation state of the resin bank, but the vicinity of the resin film edge is preferable.

It is needless to say that the metal plate, the conductivity-imparting adhesive resin, and the conductive filler are not particularly limited in terms of material, size, etc., and other thermocompression bonding conditions are not particularly limited.

(Example) Next, the Example of this invention is shown.

Example 1 When passing a coiled steel plate having a thickness of 0.4 mm and a width of 914 mm between thermocompression-bonding rolls, 0.07 mm thickness and 800 mm thickness were applied to the upper steel plate.
Conductive adhesion adhesive resin film of mm width is temporarily adhered and inserted, and the same resin film of 50 mm width is temporarily adhered to the lower steel plate at 200 mm intervals in the central part to be replenished and inserted. Then, it was thermocompression bonded (mainly bonded).

The replenishment position was adjusted to the left and right positions and intervals depending on the generation status of the resin bank to be generated, and the temperature condition during the main adhesion was set to an appropriate temperature of the melting temperature of the resin used.

As a result, the molten resin bank was uniformly formed on the entire surface, and was very stable without flow or outflow.

Example 2 A 0.47 mm thick × 1219 mm wide steel plate was inserted with a 0.07 mm thick conductivity imparting adhesive resin film × 1100 mm wide from the upper steel plate side, and a resin strip having a width of 30 mm was formed from the lower steel plate side. The film was replenished and inserted into the central part at intervals of 150 mm and thermocompression bonded. Similar to Example 1, the main adhesion conditions were set to the optimum temperature for the resin, and a stable and uniform resin bank was generated only by slightly adjusting the pressure applied to the main adhesion roll, and the resin bank did not flow.

Furthermore, filler (metal powder) inside the area of the conductive composite steel sheet
Fig. 4 shows the result of examination of the distribution situation of. From the figure, it can be seen that in the case of the present invention example, the metal powder is uniformly distributed in the width direction. On the other hand, in the case of the comparative example, the metal powder is unevenly distributed on both sides in the width direction and unevenly distributed.

Further, FIG. 5 shows the results of examining the adhesive strength in the plate width direction by carrying out a shear tensile test. The invention example has high strength and is stable in the plate width direction, while the comparative example has a high strength. It is low and varies in the width direction.

Example 3 As in the case of Example 1, when a 0.4 mm thick × 914 mm wide coil-shaped steel plate was passed between the thermocompression rolls, a 0.07 mm thick × 800 mm wide conductivity imparting adhesive resin was applied to the upper steel plate. The film is temporarily bonded and inserted, and at the same time, the heat-resistant resin fiber is temporarily bonded and inserted into the upper steel plate via the front bonding roll so that it is positioned at the edge of the resin film, and then thermocompression bonding (main bonding is performed with the main bonding roll. )did. The melting temperature of the resin used for the temperature condition during the main adhesion was set to an appropriate temperature.

For comparison, the heat-resisting resin fibers were not replenished, and they were similarly thermocompression-bonded by a main bonding roll.

When the resin bank at the time of main adhesion was observed, in the case of the comparative example, as shown in FIG. 6, the resin bank 8 flowed in the plate width direction and was wider than the resin film width. In this case, as shown in FIG. 7, the resin bank 8 was formed uniformly in the plate width direction with the same width as the resin film width.

Further, with respect to the obtained conductive composite steel sheet, as a result of examining the T-peel strength in the vicinity of the plate end, in the case of the comparative example, the strength of the plate end was decreased as shown in FIG. In the case of the example of the present invention, as shown in FIG. 9, no decrease in strength was observed even at the plate end.

Furthermore, as a result of examining the filler (metal powder) distribution in the vicinity of the plate edge, in the case of the comparative example, the filler was deviated to the plate edge as shown in FIG. 11
It was uniformly distributed as shown in the figure.

Example 4 In Example 3, instead of replenishing the yarn, an air stream was supplied in the vicinity of the resin film edge according to the procedure shown in FIG.
Compressed air was used as the gas, and the gas supply pressure was 3 kg / cm ² .

As a result, as in the case of Example 3, the resin bank was uniformly distributed in the plate width direction, the adhesive strength was also uniform in the plate width direction, and the filler distribution was also uniform.

In the above description, the case where the conductivity-imparting adhesive resin is in the form of a film has been described, but it goes without saying that the same effect can be obtained even in the case of a liquid or a gel.

(Effects of the Invention) As described in detail above, according to the present invention, a conductivity-providing composite metal plate having excellent conductivity and stable high adhesive strength and weldability without being affected by the offset of the filler is provided. Can be manufactured.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a mode of laminating conductivity-imparting composite steel sheets by the present adhesive roll and a state of a resin bank formed by a conventional method, and FIG. 2 is a yarn or band according to the present invention for the main adhesive roll portion. FIG. 3 is a diagram for explaining a mode of supplying air to the main bonding roll portion according to the present invention, and FIG. 4 is a plate width of the filler in the conductive steel plate obtained in Example 2. FIG. 5 is a diagram showing the distribution state in the direction, FIG. 5 is a diagram showing the shear adhesive force in the plate width direction of the conductive steel sheet obtained in Example 2, and FIGS. 6 and 7 are the generation of resin banks in Example 3. FIG. 6 shows the situation, FIG. 6 shows the case of the comparative example, FIG. 7 shows the case of the example of the present invention, and FIGS. 8 and 9 show the plate end portions of the conductive steel sheets obtained in Example 3. FIG. 8 is a diagram showing a T-peel strength distribution in the vicinity. FIG. 8 shows the case of the comparative example and FIG. 9 shows the case of the present invention. FIG. 10 and FIG. 11 are diagrams showing the filler distribution in the vicinity of the plate edge of the conductive steel sheet obtained in Example 3, FIG. 10 showing the case of the comparative example, and FIG. 11 showing the example of the present invention. The case is shown. 1, 2 ... Thermocompression bonding (main bonding) roll, 3, 4 ... Steel plate, 5 ... Conductivity imparting adhesive resin film, 6 ... Front bonding roll, 7 ... Conductive composite steel plate, 8 ... Resin bank,
9 ... yarn or band, 10 ... yarn or band feeder, 11 ...
… Gas feeder.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location B29K 105: 16 105: 22 B29L 9:00 4F (72) Inventor Yuichi Fujimura Amida Town, Takasago City, Hyogo Prefecture Uohashi 287-18 (72) Inventor Takahide Takada 6-10-21 Tadera, Himeji City, Hyogo Prefecture

Claims (3)

[Claims] 1. A film-like, gel-like or liquid conductivity-providing adhesive resin is continuously supplied between two upper and lower metal plates,
When manufacturing a composite metal sheet with conductivity imparted by thermocompression bonding (main adhesion) with a heat roll and laminating the layers, by supplying two or more threads or strips to the front surface of the heat roll and performing main adhesion, A method of manufacturing a composite metal plate having conductivity, comprising laminating while stabilizing a flow of a resin bank generated. 2. The yarn or strip has a melting point or glass transition temperature which is equal to or higher than a use temperature, and is made of a material and having a property that is easily flattened under pressure during main bonding. Method. 3. A film-like, gel-like or liquid conductivity-providing adhesive resin is continuously supplied between two upper and lower metal plates,
When manufacturing a composite metal plate with conductivity imparted by thermocompression bonding with a heat roll, by performing main bonding while supplying airflow to the front of the heat roll, while stabilizing the flow of the resin bank that occurs during main bonding A method of manufacturing a composite metal plate having conductivity, comprising laminating.