JPS6368284A - Manufacture of stripe clad strip - Google Patents

Abstract

PURPOSE:To obtain a stripe clad strip of high accuracy by sticking an adhesive tape on the surface of the base metal strip to be transferred from the above of the clad bar overlapped by holding the width directional position in a high accuracy and press-fitting it by rolling together with the adhesive tape. CONSTITUTION:The Al clad bar 4 fed out of a reel 5 is delivered from a guide body 6 onto the surface of the Ni steel base metal strip 2 which is delivered from a reel 1, and an adhesive tape 12 is pressed by a roller 13 by overlapping the clad bar 4 at the prescribed width position of the base metal strip 2. The clad bar 4 is thus press-fitted with its rolling by a rolling roll 7 with the adhesive tape 12 after fixing it unmovably on the surface of the base metal strip 2. The adhesive tape 12 is separated by being wound on the reel 14 thereafter and the clad strip 8 is wound through a rolling roll 16 once again. The strip clad strip of high accuracy and high quality can thus be manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention mainly relates to a method for manufacturing a striped clad band that is used as a molding material for IC lead frames.

[Prior art and problems] A co-stripe clad strip is made by rolling one or several narrow clad strips made of thin aluminum onto one or both sides of a base material strip of a constant width such as a nickel-based alloy. As is well known, when this is processed into a lead frame, conductive wires to the IC chip are bonded to the aluminum cladding portion, so the cladding strips are required to have extremely high dimensional accuracy. The conventional manufacturing method will be explained with reference to FIG. 5. 1 is a rewinding reel, 2
is the base material strip that is unwound from the unwinding reel.

3 is a wire brush for polishing the surface of the base material band to be crimped. On the other hand, reference numeral 4 denotes a clad strip drawn out from the unwinding reel 5, and the clad strip is guided into the groove of the guide body 6 and overlapped at a predetermined width position on the surface of the base material band 2. The cross section is shown in FIG. In the figure, there are three cladding strips 4.
The width direction positions MW1 to W4 are determined by the grooves 6' of the guide body 6. In this way, the cladding strip 4 is fed into the rolling roll 7 in a superimposed state on the surface of the base material strip 2, where it is rolled and crimped, and the integrated striped cladding strip 8 is wound up on the winding roll 9.

However, cladding strip positioning using the lever groove guide method has a problem in that its dimensional accuracy is unstable.

That is, in the groove guide method, the thickness of the guide body 6 is generally required to be approximately 5 mm or more for strength reasons, and therefore the tip end 6 of the guide body
It is difficult to make the distance between the rollers 1 and 2 very close to the center line 10 of the biting roll 7, and generally this distance is between 40 and 80 degrees. For this reason, due to vibrations during rolling and other factors, the cladding strip once positioned at the tip 6'' of the guide body often shifts in the width direction while traveling a distance, making it impossible to maintain accuracy.Alternatively, to prevent this, the guide body If the guide body 6 is placed too close to the rolling roll 7, there is a problem that the guide body 6 will be caught in the rolling roll 7 and damaged.

Furthermore, in conventional crimping rolling, if a rolling lubricating oil is used, the lubricating oil will enter the interface between the cladding strip and the base metal strip on the roll entry side and impede crimping, making it impossible to use rolling lubricating oil. As a result, friction seizure and the like of the rolling rolls are likely to occur. To avoid this, the rolling reduction ratio must be set small, or, for example, forged steel rolls cannot be used as rolling roll materials because they tend to seize, and cemented carbide rolls must be used. There was a problem that there were restrictions and the equipment costs were high.

[Means for Solving the Problems] The method for manufacturing a striped clad strip of the present invention is intended to solve the above problems, and involves guiding clad strips of a constant width on the surface of a base material strip that is conveyed in the longitudinal direction. The clad strip is fed out from the body and continuously polymerized while maintaining high accuracy in the width direction position, and an adhesive tape is applied from above to immovably fix the clad strip to the surface of the base material strip. It is characterized by being rolled and crimped together. Note that the adhesive tape in the present invention also includes a film-like adhesive tape.

[Function] The adhesive tape allows the cladding strips to be positioned on the surface of the base material strip with high dimensional accuracy without deviation in the width direction, making it possible to manufacture a striped cladding strip with high precision and high quality.

[Example code] Next, an embodiment of the present invention will be described with reference to FIG.

A 42% Ni steel strip with a plate thickness of 0.4 mm and a width of 72.5 mm is used as the base material strip 2 unwound from the unwinding reel 1.

As the cladding strip 4 unwound from the unwinding reel 5, an aluminum strip having a thickness of 12 μm, a width of 5, and 0 m+o is used. The cladding strip 4 is guided by a guide body 6 and the base material strip 2
are superimposed at a predetermined width position. A second adhesive tape 12, which has been unwound from the unwinding reel 11, is held down by an adhesive roller 13 at a portion very close to the tip of the guide body 6 at a distance L1, so that the adhesive tape 12 is placed on the base material strip 2 side. As shown in the cross-sectional view of the figure, this clad strip 4 is immovably fixed with an adhesive tape 12. As the adhesive tape 12, a commercially available sheet for protecting the surface of a metal plate, such as polyethylene, can be used. In this case, a transparent or translucent tape is preferable so that the fixed state of the clad strip can be visually confirmed from the outside. Here, the rolling roll 7 is provided at a distance L2 sufficiently away from the adhesive roller 13, and the base material strip 2 formed by fixing the clad strip 4 in position with adhesive tape as described above is rolled by the rolling roll 7. Then, the clad strip 4 is crimped and integrated into the base material band 2. Reference numeral 14 denotes a take-up reel for winding only the adhesive tape 12 after this rolling bonding.

15 is its guide roller. In this way, adhesive tape 1
The transferred cladding zone 8 that has left the rolling roll 2 is transferred to the rolling roll 1 again.
6, the clad strip 4 is further completely crimped onto the base material strip 2, and then wound onto a take-up reel 9.

In the embodiment shown in FIG. 1, the adhesive tape application and rolling are performed in one continuous line, but this may be done in discontinuous lines. That is, as shown in FIG. 3, after pasting the adhesive tape 12, it is wound onto a take-up reel 9, and then the tape is fed out from the take-up reel 9 onto a rolling roll to form a cladding. The strips may be rolled and crimped. By processing in discontinuous lines in this way, the transport speeds of the bands on both lines can be optimized. That is, in the case of a continuous line as shown in FIG. 1, for example, even if the rolling rolls and rolling capacity are 100 to 400 m/min when the plate thickness is approximately 21111 or less, the transfer speed is 10 to 400 m/min due to the polishing capacity of the wire brush 3. There have been cases where the speed has been limited to 20 m/min, which has prevented productivity from increasing, but by processing each on a separate line, such problems are eliminated and productivity is improved.

Figure 4 shows the deviation in the position of the clad strip in the width direction of the clad strip manufactured by the conventional method, the clad strip manufactured by the continuous line of the present invention, and the clad strip manufactured by the discontinuous line of the present invention. is expressed with the distance from the tip of the cladding zone as the horizontal axis. In addition, in the conventional method, the distance in Fig. 5 is 401, and the plate thickness is 0 by the rolling machine.
．． After rolling and crimping 4mm at a speed of 12rn/min without lubrication, further using lubricating oil at a speed of 100+w/win 2
Clad strip 4 rolled to a plate thickness of 0.25 mflll
was used as a sample.

In addition, the method of the present invention (continuous line) reduces the distance L1 in Fig. 1 to 1
0mm and the adhesive tape is made of polyester and has a thickness of 40mm.
Using a μm2 width of 72.5 mm, speed of 12 feet/wi
It was rolled and crimped to a plate thickness of 0.35+am at n. In this case, seizure did not occur even if the rolling reduction ratio was increased slightly due to the lubrication ability of the adhesive tape itself. This adhesive tape was peeled off on the exit side of the rolling roll and then wound up and removed. Then, the clad zone is further coated with lubricating oil to increase the speed Loom/mi.
The plate was finish rolled to a thickness of 0.25 mm.

In addition, the method of the present invention (discontinuous line) is shown in Figure 3.
5++n and polyethylene adhesive tape with a thickness of 8
After pasting a piece with a width of 0 μm and a width of 72.5 mm, it was wound into a coil. This is then processed using a rolling roll on another line using lubricating oil at a speed of Loom/ll1 inch to a plate thickness of 0°30.
It was rolled and crimped to +nm. In this case as well, the adhesive tape was peeled off and removed on the exit side of the rolling roll. Using lubricating oil, this cladding band was further coated at a speed of 150m/ll1n with a thickness of 0.
It was finish rolled to 25m+a.

As can be seen from Figure 4, the cladding strip manufactured by the method of the present invention has significantly higher positional accuracy for both continuous lines and discontinuous lines than the cladding strip manufactured by the conventional method in terms of A, B, and 0 strips. It was recognized that the results had improved. Note that the distance between the holes in FIGS. 1 and 3 is desirably short, and preferably shorter than 30 mm.

[Effects of R-light] As explained in the embodiments above, according to the present invention,
Since the cladding strips are fixed to the base material band with adhesive tape after being superposed, the crimping position can be maintained with extremely high precision without being affected by vibrations of rolling rolls or the like or displacement during running. Furthermore, since the adhesive tape prevents lubricating oil from entering the interface between the cladding strip and the base material band, even if lubricating oil is used, the pressure bonding properties will not be impaired. Therefore, lubricating oil can be used with confidence, there is no need to reduce the rolling reduction, etc., and there are significant effects such as improved productivity and lower equipment costs.

[Brief explanation of drawings]

FIG. 1 is a side view of a continuous line showing an embodiment of the manufacturing method according to the present invention, FIG. 2 is a sectional view taken along line X-X, FIG. 3 is a side view of a discontinuous line, and FIG. A line diagram showing the accuracy in the width direction of the cladding band, FIG. 5 is a side view of the line of the conventional manufacturing method, and FIG. 6 is a cross-sectional view of the guide body of FIG. 5. 2...Base material band, 4...Clad strip, 6...
Guide body, 7... Rolling roll, 12... Adhesive tape.

Claims (1)

[Claims] A cladding strip of a certain width is fed out from a guide body onto the surface of a base material strip that is conveyed in the longitudinal direction, and is continuously polymerized while maintaining a high precision in the widthwise position, and an adhesive tape is pasted on top of the cladding strip. A method for manufacturing a striped clad strip, characterized in that the strips are immovably fixed on the surface of the base material strip, and then rolled and crimped together with adhesive tape.