JPH0698429B2 - Manufacturing method of modified strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention has steps having different thicknesses in the width direction used for manufacturing terminals for electric and electronic parts, lead frames for power transistors, relay sections for relays, etc. It relates to a method for manufacturing a modified strip.

[Conventional technology]

In general, the modified strips shown in FIG. 6 (a), (b),
The modified strips having the cross-sectional shapes shown in (C) and (D) are often used, and are usually manufactured by a cutting method, a modified groove rolling method, an extrusion method, a drawing method, or the like. The cutting method is a method in which a thin portion is scraped off and a large yield of cutting chips is generated, and the yield is low. The irregular groove rolling method is a method in which a desired cross-sectional shape is obtained by sequentially rolling with a large number of rolls provided with gradually changing grooves. When processed into a complicated shape in one rolling, the processing strain is balanced. First of all, it requires a lot of machining from the point of causing unnecessary waviness. Therefore, it is difficult to design not only a large number of rolls but also a groove that gradually changes, and the manufacturing cost becomes high. In the extrusion method, a billet is extruded into a desired cross-sectional shape through a die, and a profiled strip can be easily manufactured. However, this method is not only inferior in dimensional accuracy, but also becomes short in nature, which is a method that violates the current demand for lengthening. In the drawing method, the wire is drawn through a die, and the profile processing can be performed relatively easily. However, this method is not suitable for the processing of wide materials because it is not possible to obtain a high processing rate but is mainly used for processing wire materials.

In recent years, a special reciprocating rolling method using a triangular die has been proposed for the processing of wide profile strips. In this method, the strip is rolled in the longitudinal direction and expanded in the width direction at the corners of the triangular die.However, the amount of width expansion in one reciprocating rolling is small, and multiple processing operations are required. It was inferior in productivity.

On the other hand, there is known a method in which a wire or strip is rolled at right angles to the longitudinal direction, that is, in the width direction to obtain a width expansion several times larger than the material width that cannot be obtained by ordinary rolling. This method uses a rolling roll that reciprocally rolls on a flat plate, press-fits a wire rod or strip in the roll axial direction between the flat plate and the rolling roll, and rolls the rolling roll to roll the wire rod or strip in the width direction. Is.

[Problems to be solved by the invention]

Each of the above-mentioned methods for producing a profiled strip has advantages and disadvantages, and it has been impossible to efficiently produce a long profiled strip having excellent dimensional accuracy. For example, even in the special reciprocating rolling method using a triangular die, in the width direction expanding process as described above, the width expanding amount by one reciprocating rolling is not so large, and a large number of processing operations are required to manufacture the profiled strip. The processing speed is slow and the productivity is inferior.

[Means for solving problems]

As a result of various studies in view of this, the present invention has developed a method for manufacturing a deformed strip capable of efficiently rolling a strip in the width direction and accurately forming a step having a different thickness in the width direction, An axial groove is formed on the surface of a rolling roll that reciprocally rolls on a flat plate, and a groove corresponding to the side of the groove is formed in the longitudinal direction of the surface in the roll axial direction between the flat plate and the rolling roll. Is intermittently inserted, and the strip is rolled in the width direction except the groove to form a step in the width direction of the strip.

That is, according to the present invention, as shown in FIGS. 1 (a) and 1 (b), a groove (4) in the roll axial direction is formed on the surface of a rolling roll (3) that reciprocally rolls on a flat plate (2). , The axis of the reduction roll (3) is inclined with respect to the flat plate (2) to gradually narrow the gap between the flat plate (2) and the reduction roll (3) in the axial direction of the roll, and thus the flat plate (2) and the reduction roll (3). A strip (4) having a groove corresponding to the side of the concave groove (4) in the longitudinal direction of the roll axial direction is intermittently inserted by applying tension in the longitudinal direction to form a strip (1). Is rolled in the width direction other than the concave groove (4) to form a step in the width direction of the raw strip (1).

The flat plate (2) and the reduction roll (3) are provided in the housing (6) to support the flat plate (2), and the reduction roll (3)
The backup roll (5) is mounted on the upper side, and the backup roll (5) is backed up by the support plate (7) provided on the upper side of the housing (6). In this way, the reduction roll (3) and the backup roll (5) are rolled in the direction perpendicular to the roll axis by, for example, a power transmission device such as a crank mechanism, and are indicated by dotted lines (3a), (5a) to (3b). ),
Rolling to the left and right as in (5b) is repeated to roll the strip (1) in the width direction other than the groove (4), and the reduction roll (3) is shown in the figure (3a) or (3b). When the rolling roll (3) does not bite the strip (1),
A raw strip (1) having a groove corresponding to the side of the concave groove (4) in the longitudinal direction of the surface is applied with tension in the longitudinal direction and is intermittently inserted by a certain length to be rolled.

In order to apply tension in the longitudinal direction of the strip (1), the strip (1) to be inserted is provided by inserting a caterpillar capstan in the front and rear in the axial direction of the reduction roll (3), or as shown in FIG. As shown, holding a pair of upper and lower rolls (8) and (9) such as pinch rolls, and holding the strip (1) to be inserted,
The front roll (8) or capstan is braked and the rear roll (9) or capstan is driven intermittently.

Further, between the flat plate (2) and the reduction roll (3), as shown in FIG. 3, a groove (1a) corresponding to the side of the concave groove portion in the surface longitudinal direction.
In order to insert and roll the raw strip (1) having the groove formed therein, the groove (4) provided in the axial direction of the surface of the reduction roll (3) is gradually deepened in the axial direction, and the side of the groove (4) is striped. The thin side (1b) of the bare strip (1) without contacting the thick side step (1c) of (1)
Rolling in the width direction. Groove (1a) in the longitudinal direction of the raw strip (1)
To form the groove, a groove corresponding to the side of the concave groove portion is formed in the longitudinal direction through a pre-groove roll, or as shown in FIG. 4 instead of the front roll (8) shown in FIG. A flat roll (10) and a grooving roll (11) are used for the above, and the rear roll of the reduction roll is intermittently driven without driving them to form a groove (1a) in the longitudinal direction of the raw strip (1). To do.
At this time, the thick-walled step portion (1c) is formed to have an accurate dimension.

[Action]

According to the present invention, a thin strip portion corresponding to a thin portion is gradually processed in the width direction according to the present invention, so that the thin portion does not have an unprocessable corrugation, and a single feed amount is about several tens mm. There's no reason why. In addition, since the cross section gradually deforms and the material is tensioned, the material is kept in a fixed position, bending can be reduced during rolling in the width direction, and deviation from the groove of the reduction roll occurs during each rolling. There is no. Also, by forming a groove corresponding to a desired step in the longitudinal direction of the surface of the strip, even if there is little or no tension, it is not affected by the bending during rolling in the width direction, and the product quality is stable. The stepped portion can be formed accurately. If tension is applied to this, the shape of the step will be
The dimensions are more accurate.

The manufacture of the modified strip shown in FIG. 6 (a) has been described above, but the present invention is not limited to this, and FIG. 6 (b) and (c)
Of course, (d) can be easily manufactured by processing the deformed strip shown in FIG. 6 (a) and then inverting and processing it. Furthermore, if a finishing roll having a deformed strip as shown in FIG. 5 is used as a roll for holding the raw strip processed after the reduction roll, the shape and dimensions of the deformed strip can be finished more accurately.

〔Example〕

(1) 3m thick by the method shown in Fig. 1 (a) and (b)
Using a copper strip having a width of 50 mm and a width of 50 mm, a profile strip having a sectional shape shown in Fig. 6 (a) was manufactured. First, a groove with a width of 16 mm and a width of 3 mm and a depth of 2 mm is formed on the surface of a copper strip by rolling, a unit tension of 10 kg / mm ² is added to this, and it is rolled at a feed of 30 mm, and the thickness is 3 mm and the thickness is thin. A profiled strip with a thickness of 1 mm was used. The obtained profiled strip had some bending, but the shape of the step portion was the rolling groove, which was extremely good.

〔The invention's effect〕

According to the present invention, since the thick portion is not rolled during rolling in the width direction of various profiled strips, the groove width of the pressing roll hardly changes, only the depth needs to be changed, and the manufacturing cost of the pressing roll is low. If the tension is applied, the quality of the product will be further improved. By arranging the braking roll and the driving roll before and after the reduction roll, tandem processing is possible, and the manufacturing cost is reduced and the production cost of the deformed strip is reduced.
It is suitable for high-mix low-volume production of electronic parts and has a remarkable industrial effect.

[Brief description of drawings]

1 (a) and 1 (b) show an example of the manufacturing method of the present invention, in which (a) is a front view, (b) is a side view, and FIG. 2 is a raw strip in the manufacturing method shown in FIG. Fig. 3 is a side view showing an example of the tension applying method of Fig. 3, Fig. 3 is a plan view showing an example of the deformed state of the raw strip in the manufacturing method shown in Fig. 1, and Fig. 4 is a front view showing an example of a grooved roll. Fig. 5 is a front view showing an example of a modified strip finish rolling roll, Figs. 6 (a), (b), (c),
(D) shows the cross-sectional shapes of different profiled strips. 1 ... Raw strip, 2 ... Flat plate, 3 ... Reduction roll, 4 ... Groove, 5 ... Backup roll, 6 ... Housing, 8 ... Front roll, 9 ... Rear roll

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Kazuhiro Ozawa 500 Kiyotaki Town, Nikko City, Tochigi Prefecture Furukawa Electric Co., Ltd. Nikko Denki Copper Works (56) References Japanese Patent Publication 1-50502 (JP, B2)

Claims (2)

[Claims] 1. An axially concave groove is formed on the surface of a pressing roll that reciprocally rolls on a flat plate, and corresponds to the side of the concave groove in the longitudinal direction of the surface in the axial direction of the roll between the flat plate and the pressing roll. A method for producing a deformed strip, characterized in that a strip formed with grooves is intermittently inserted, and the strip is rolled in a width direction other than the concave groove to form a step in the width direction of the strip. 2. A flat plate and a pressing roll, in which a groove corresponding to the side of the groove is formed in the surface longitudinal direction of the strip by a grooved roll in front of the stripping roll and the strip is sandwiched by the roll at the rear. The method for producing a profiled strip according to claim 1, wherein the irregularly shaped strip is inserted intermittently between them.