JP2022172611A - Method and device for manufacturing deformed cross-sectional bar - Google Patents

Abstract

To shorten a device and stably obtain a deformed cross-sectional bar having preferable quality.SOLUTION: A method for manufacturing a deformed cross-sectional bar of which center part in a width direction is formed to be thicker than an outer edge part includes a step of rolling an outer edge part 91 of a bar material 9 to a predetermined thickness by repeatedly reciprocating a pressing body 4 of which pressing surface 40 is provided with a substantially conical shaped recess part 42 in a thickness direction of the bar material 9 while moving the bar material 9 in a longitudinal direction and pressing the outer edge part 91 of the bar material with the pressing surface 40.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a manufacturing method and a manufacturing apparatus for a contoured cross-section strip in which the central portion in the width direction is formed thicker than the outer edge portions.

Long plate-shaped deformed cross-section strips, which are used by being incorporated in other equipment such as lead frames of electronic parts and are formed thicker at the center in the width direction than at the outer edges, are mainly formed by cutting or rolling. . In particular, when the outer edge of the strip is to be made thinner and wider, a method of rolling with rollers is widely used in consideration of material loss and productivity.

However, if one roller is used to form a strip with a profiled cross-section as described above, the difference in processing rate between the thick portion and the thin portion tends to cause molding defects such as cracks, wrinkles, and distortion in the strip. Therefore, conventionally, in order to improve such manufacturing quality problems, a method has been proposed in which a plurality of rollers with different pressing surface widths are used to gradually roll a strip from a small area to a large area (for example, patent References 1 and 2).

The modified cross-section strip manufacturing apparatuses disclosed in Patent Documents 1 and 2 are equipped with a plurality of rolling rolls each composed of a flat roll and a convex roll having two convex portions provided on the outer peripheral surface thereof with a predetermined interval therebetween. ing. In addition, the convex rolls are arranged side by side so that the width of the peripheral surface of the convex portion, which serves as a pressing surface, increases in accordance with the direction in which the rolling progresses. is expanded stepwise outward in the width direction. Thereby, the above molding defects can be suppressed.

JP-A-10-180389 JP-A-55-88943

However, in the manufacturing methods of modified cross-section strips of Patent Documents 1 and 2, it is necessary to arrange a plurality of rolling rolls in parallel in the direction in which rolling progresses, so there is a problem that the manufacturing apparatus becomes large.

On the other hand, if the diameter of the convex portion is reduced, the distance between the rolling rolls can be shortened accordingly, so it is possible to somewhat shorten the manufacturing apparatus. On the other hand, however, since the angle of approach of the peripheral surface of the convex portion to the surface of the strip becomes large, the rolled portion is likely to deform in the lengthwise direction of the strip, and the above-mentioned forming defects cannot be sufficiently suppressed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a method and apparatus for manufacturing profile strips, which is designed to reduce the size of the device and stably obtain profile strips of good quality. for the purpose.

In order to solve the above problems, the manufacturing method and manufacturing apparatus of the modified cross section strip of the present invention take the following technical means.

A method for manufacturing a modified cross-section strip according to the present invention is a method for manufacturing a modified cross-section strip in which the center portion in the width direction is formed thicker than the outer edge portion, and the pressing surface is moved while moving the strip material in the length direction. A pressing body provided with a substantially cone-shaped concave portion is repeatedly reciprocated in the thickness direction of the strip, and the pressing surface presses the outer edge of the strip, so that the outer edge of the strip is pressed by the predetermined pressure. It is characterized by being rolled to thickness.

Preferably, the pressing body is reciprocated at a position where the center of the recess is outside the side end surface of the strip.

An apparatus for manufacturing a modified cross-section strip according to the present invention is a manufacturing apparatus for a modified cross-section strip in which the center portion in the width direction is formed thicker than the outer edge portion, and includes a feed mechanism section for moving the strip material in the length direction. a pressing body that presses the strip; and a pressing mechanism that reciprocates the pressing body in the thickness direction of the strip, wherein the pressing body has a substantially conical concave portion on the pressing surface. , while moving the strip in the length direction, the pressing body is repeatedly reciprocated in the thickness direction, and the pressing surface presses the outer edge of the strip, so that the outer edge is pressed by the pressing surface. It is characterized in that it is configured to be rolled to a thickness.

Preferably, the pressing body is arranged at a position where the center of the recess is outside the side end surface of the strip.

Preferably, the pressing body is provided with a planar portion capable of surface-contacting the strip member along the outer periphery of the recess on the pressing surface.

According to the manufacturing method and manufacturing apparatus for a modified cross-section strip of the present invention, the outer edge of the strip can be rolled along the length direction by a single pressing body, so that the size of the entire apparatus can be reduced. is possible. Moreover, during the rolling, the outer edge of the strip is deformed toward the center along the inner inclined surface of the recess provided in the pressing surface of the pressing body, so that it is difficult to deform in the longitudinal direction. As a result, it is possible to stabilize the manufacturing quality.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a rolling mill capable of executing a method for manufacturing a contour strip according to an embodiment; FIG. 4 is a schematic perspective view showing the vicinity of the pressed portion of the strip; It is a schematic sectional drawing which shows the pressed part periphery of a strip|stripe material. FIG. 4 is a diagram showing a process in which a strip is rolled by a pressing body; FIG. 4 is a schematic configuration diagram showing another form 1 of the rolling mill; FIG. 11 is a schematic configuration diagram showing another form 2 of the rolling mill; It is a schematic diagram showing another form 1 of the pressing body. It is a schematic diagram showing another form 2 of the pressing body. It is a schematic diagram showing another form 3 of the pressing body.

BEST MODE FOR CARRYING OUT THE INVENTION A method for manufacturing a contour strip according to an embodiment of the present invention and a manufacturing apparatus capable of executing the method will be described below with reference to the drawings. It should be noted that the embodiment described below is an example of the present invention, and the specific example does not limit the configuration of the present invention.

As shown in FIG. 1, a modified cross-section strip manufacturing apparatus (hereinafter referred to as "rolling apparatus") 1 according to the present embodiment includes a long flat plate-shaped strip 9 having a center portion 93 between the left and right sides thereof as an outer edge portion. Rolled to be thicker than 91 to form a modified cross-section strip, comprising a pedestal 2 for supporting the strip 9, a feed mechanism 3 for moving the strip 9 in the length direction, and a strip. A pressing die 4 as a pressing body that presses the strip 9 from the thickness direction, a pressing mechanism section 5 that reciprocates the pressing die 4 in the thickness direction of the strip 9, and the feeding mechanism section 3 and the pressing mechanism section 5. and a control circuit (not shown) for controlling the operation of.

In this embodiment, the length direction of the strip 9 placed on the pedestal 2 in the working direction is the front-rear direction of the rolling mill 1, the width direction of the strip 9 is the left-right direction of the rolling mill 1, Let the thickness direction of the strip 9 be the vertical direction of the rolling mill 1 .

The pedestal 2 is provided in front of the feed mechanism 3 and at a position facing the lower side of the pressing die 4 , and the strip member 9 is placed in the gap between the upper surface 20 of the pedestal 2 and the lower end surface 40 of the pressing die 4 . , is fed out by the feeding mechanism 3 from the rear.

The pedestal 2 may be fixed at a predetermined position of the rolling mill 1, or may be manually or electrically adjustable to an arbitrary height or to the front, rear, left, or right. Further, the horizontal position of the strip 9 when the strip 9 is sent to the upper surface 20 of the base 2 may be arbitrarily adjusted by a strip position adjusting mechanism (not shown) provided in the base 2 or the feed mechanism section 3. However, it may be held at a specific position by a guide mechanism (not shown) provided on the pedestal 2 or the feed mechanism section 3 .

The pressing die 4 is formed in a substantially columnar shape, the lower end surface 40 serves as a pressing surface for pressing the strip member 9 , and the upper end surface 41 is connected to and supported by the pressing mechanism portion 5 . More specifically, the pressing die 4 is connected to and supported by the pressing mechanism 5, and can press the strip 9 to a predetermined thickness by the lower end surface 40 at an upper position where the lower end surface 40 does not contact the strip 9. It is configured to be able to reciprocate up and down between the lower position.

As shown in FIGS. 2 and 3, the pressing die 4 is positioned such that the center axis L1 is outside the side end surface 92 of the strip 9, that is, the center is outside the side end surface 92 of the strip 9 when viewed from above. It is arranged in an offset position. Therefore, when the pressing die 4 is moved downward, it presses the outer edge portion 91 of the strip 9 within a range of half or less of the lower end surface 40 .

The lateral positional relationship between the pressing die 4 and the strip 9 may be maintained by adjusting the lateral position of the strip 9 as described above. The left and right positions may be held by arbitrarily adjusting the die position adjusting section (not shown) of the pressing mechanism section 5 .

A lower end surface 40 of the pressing die 4 is formed with a conical concave portion 42 that is recessed upward. The concave portion 42 is arranged at a position where a concave center line L2 passing through the top thereof coincides with the central axis line L1 of the pressing die 4 . Also, the diameter of the recess 42 is formed to be substantially the same as the diameter of the lower end surface 40 . Thus, the recess 42 is provided on the concentric circle of the lower end surface 40 and its outer peripheral edge substantially coincides with the lower end outer peripheral edge 43 of the pressing die 4 . That is, the lower end surface 40 of the pressing die 4 is formed to be conically recessed as a whole. Therefore, when the pressing die 4 is moved downward, the edge portion of the lower outer peripheral edge 43 is first brought into pressure contact with the outer edge portion 91 of the strip 9, and then the inner inclined surface of the recess 42 (hereinafter referred to as the "recess 44 is pressed against the outer edge 91 .

The inclination angle of the peripheral surface 44 of the concave portion is relatively gentle (for example, a 5-degree gradient). Therefore, when the pressing die 4 is moved downward, the outer edge portion 91 of the strip 9 is pressed downward by the recess peripheral surface 44 as shown in FIGS. pressed towards. That is, the strip 9 is pressed downward and slightly obliquely outward. As a result, the outer edges 91 are deformed so as to be pushed outward (in the width direction).

Although not shown, the control circuit includes a feeding operation adjusting section for adjusting the length (feeding amount), speed, timing, etc., of advancing the strip 9 by the feeding mechanism section 3, and a pressing mechanism section 5 for moving the pressing die 4 up and down. It has a circuit configuration such as a pressing operation adjusting unit that adjusts the distance (pressing depth), speed, and timing of movement, and controls the operations of the feed mechanism unit 3 and the pressing mechanism unit 5 by, for example, the following method. In addition, the central portion 93 between the left and right sides forms a profiled cross-sectional strip thicker than the outer edge portion 91 .

When the strip 9 is properly placed on the pedestal 2 and an instruction to start rolling is given by the operation unit (not shown) of the rolling mill 1, the feed mechanism 3 feeds the strip 9 to a predetermined length at predetermined intervals. The operation of moving forward by A1 and stopping is started. That is, as shown in (1) to (4) of FIG. 4, a feeding operation is executed to intermittently move the strip 9 forward by a predetermined length A1 at regular intervals.

On the other hand, the pressing mechanism part 5 lowers the pressing die 4 to a predetermined position (lower position) and starts the operation of returning the pressing die 4 to the upper position at each predetermined time. That is, in accordance with the feeding operation of the strip 9, the pressing operation is executed to reciprocate the pressing die 4 between the upper position and the lower position. This pressing operation is performed at the timing when the lower end face 40 of the pressing die 4 is pressed against the outer edge portion 91 of the strip 9 while the strip 9 is stopped.

In this manner, the rolling mill 1 intermittently moves the strip 9 forward by a predetermined length A1 at regular intervals, and reciprocates the pressing die 4 repeatedly up and down in accordance with the timing. As a result, the outer edge portion 91 of the strip 9 is repeatedly deformed by a predetermined length A1 so as to be pushed out toward the center, that is, toward the outside (width direction) of the strip 9 by the recess peripheral surface 44 of the pressing die 4. be done. As a result, as shown in FIG. 4(5), the outer edges 91 are rolled along the longitudinal direction and formed thinner than the central portion 93 .

When the outer edge portion 91 of the pressing die 4 is first pressed against the outer edge portion 91 of the strip 9 by the above-described pressing operation, the portion to be pressed of the outer edge portion 91 has, as shown in FIG. Then, a wedge-shaped indentation F is formed along the peripheral surface 44 of the recess. It is stretched so as to be scraped out, smoothed, and finally flattened.

When the other outer edge portion 91 of the strip 9 is to be rolled in the same manner, the strip 9 that has been rolled as described above is reversed, placed on the base 2, and pressed. As a result, the left and right outer edge portions 91 are thinner than the central portion 93 to form a modified cross-sectional strip.

According to the above method, since the outer edge portion 91 of the strip 9 can be rolled along the length direction with one pressing die 4, it is possible to shorten the entire rolling mill 1. be. Moreover, during rolling, the outer edge portion 91 of the strip 9 is deformed toward the center by the recess peripheral surface 44 of the pressing die 4, and is difficult to deform in the longitudinal direction or toward the central portion 93, so that the portion to be pressed is not deformed. Forming defects such as cracks, wrinkles, and distortion are unlikely to occur around the Therefore, it is possible to stabilize the manufacturing quality.

Moreover, as described above, the pressing die 4 is reciprocated up and down at a position where the center (the center of the concave portion 42) is outside the side end surface 92 of the strip 9, and the strip is pressed in a range of half or less of the lower end surface 40. Since the outer edge portion 91 of the strip member 9 is more reliably pushed outward by the recessed peripheral surface 44 of the lower end surface 40, the molding defects described above are less likely to occur, and the manufacturing quality is improved. Further stabilization can be achieved.

Further, in this device, an edge portion that can be fitted into the strip 9 is provided on at least a part of the outer peripheral edge 43 of the lower end of the pressing die 4 , and the edge portion continues toward the center of the pressing die 4 . Since the inclined portion is provided, when the pressing die 4 is pressed against the strip 9, the outer edge portion 91 of the strip 9 is less likely to be pushed toward the central portion 93, thereby improving the manufacturing quality. can be stabilized.

It should be noted that if a sufficient pressurizing force is obtained to plastically deform the strip 9 with a desired dimensional accuracy, the above-described pressing operation moves the pressing die 4 up and down at a relatively high speed to press the strip 9. Alternatively, the pressing die 4 may be moved up and down at a relatively low speed, and the pressing die 4 may be moved slowly and slightly against the strip 9 from above. You may make it press one by one. Alternatively, when the pressing die 4 is lowered, the pressing die 4 may be finely moved up and down at high speed, and the strip 9 may be pressed by the high-frequency vibration.

Further, in the present embodiment, one pressing die 4 is used to roll one outer edge 91 of the strip 9, but as shown in FIG. , and the outer edge portions 91 on both the left and right sides of the strip 9 may be rolled simultaneously by these two pressing dies 4 . As a result, the manufacturing efficiency of the profile strip is significantly improved. In addition, since a plurality of pressing dies 4 are not arranged side by side in the longitudinal direction of the strip 9, the problem of lengthening the entire rolling mill 1 hardly occurs.

If the rolling mill 1 is permitted to be elongated, a plurality of pressing dies 4 are arranged along one outer edge 91 of the strip 9 , and the strip 9 is rolled by these pressing dies 4 . One of the outer edges 91 may be continuously rolled, or the two pressing dies 4 arranged side by side on the left and right sides of the strip 9 as described above may be further arranged in a plurality of rows in front and behind, The outer edge portions 91 on both the left and right sides of the strip 9 may be continuously rolled by these pressing dies 4 . By doing so, the production efficiency of the profile strip is further improved.

Further, in this embodiment, the pedestal 2 is provided up to a position facing the pressing die 4 below, and the pedestal 2 and the pressing die 4 sandwich and press the outer edge 91 of the strip 9 from above and below. As shown in FIG. 6, a support mold 6 abuts on the outer edge 91 of the strip 9 from below at the side of the pedestal 2 and at a position opposed to the lower side of the pressing mold 4 . may be provided so that the outer edge portion 91 is sandwiched between the lower end surface 40 of the pressing mold 4 and the upper end surface 60 of the supporting mold 6 and pressed. Also in this case, the same effects as those of the above-described embodiment can be obtained.

In this case, the support die 6 may be fixed at a predetermined position of the rolling mill 1, similarly to the pedestal 2, or may be manually or electrically adjustable to an arbitrary height and to the front, rear, left, and right. Also, like the pressing die 4, it may be connected to and supported by a pressing mechanism (not shown) so as to be capable of reciprocating up and down.

Further, the support mold 6 may have a substantially conical concave portion which is recessed downward vertically symmetrically with the lower end surface 40 of the pressing mold 4 on the upper end surface 60 . With this device, the outer edges 91 of the strip 9 can be pushed outward from both the upper and lower surfaces, so that the manufacturing efficiency of the strip with modified cross-section is greatly improved.

In this embodiment, the lower end surface 40 of the pressing die 4 is formed with a conical recess 42 that is recessed upward, but the outer edge 91 of the strip 9 is pushed out. The concave portion 42 is not limited to a conical shape as long as it can be pressed appropriately, and may be formed in a cone shape with an elliptical or oval bottom, or a truncated cone with a flat top. It may be formed as a solid, or may be formed in a multi-pyramidal shape such as a triangular pyramid shape, a quadrangular pyramid shape, or a hexagonal pyramid shape.

In addition, the recess peripheral surface 44 is not limited to having a constant inclination angle (gradient) over the entire surface as long as it can appropriately press the outer edge 91 of the strip 9 to the outside. For example, it may be formed into a convex curved surface whose inclination gradually becomes gentler from the center side toward the outer peripheral side, or it may be formed into a concave curved surface shape whose inclination gradually becomes steeper from the center side toward the outer peripheral side. It may be formed in

In the case where the bottom portion of the concave portion 42 is formed in an elliptical or oval shape, if the pressing die 4 is arranged so that the major axis direction thereof is parallel to the length direction of the strip 9, the strip 9 can be formed. The outer edge 91 can be deformed so as to be more reliably pushed out. That is, it is possible to more reliably prevent the outer edge portion 91 from being pushed toward the central portion 93 side. As a result, the manufacturing quality can be further stabilized.

Further, in this embodiment, the outer peripheral edge of the recess 42 of the lower end surface 40 of the pressing die 4 is configured to substantially match the lower outer peripheral edge 43 of the pressing die 4, that is, the lower outer peripheral edge 43 is an edge. However, as shown in FIG. 7, the concave portion 42 may have a smaller diameter than the lower end surface 40 and a flat portion may be provided along the outer peripheral edge 43 of the lower end. In this case, while the pressing die 4 is reciprocating up and down, the indentation F is planarly pressed by the flat portion of the lower outer peripheral edge 43, so that the surface of the outer edge 91 can be rolled more smoothly. can.

Further, in the present embodiment, the depression 42 is provided concentrically on the lower end surface 40 of the pressing die 4, but as shown in FIG. It may be provided eccentrically toward the central portion 93 of the strip 9 so as to be in contact with the outer peripheral edge 43 . In this case, the edge portion of the outer peripheral edge of the recess 42 on the side of the central portion 93 substantially coincides with the outer peripheral edge 43 of the lower end and is formed in an edge shape, so that the outer edge portion 91 is pushed toward the central portion 93 side. can be suppressed more reliably.

Further, the pressing die 4 is not limited to a columnar shape, but is formed in a 1/3 columnar shape as shown in FIG. It may be formed in a 1/4 columnar shape. Further, if the pressing die 4 is formed in an elliptical columnar shape or an elliptical columnar shape, by arranging the major diameter direction thereof to be parallel to the length direction of the strip 9, the pressing operation can be performed once. Since the outer edge portion 91 of the strip 9 can be pressed over a wider range, the manufacturing efficiency of the strip with modified cross section is further improved.

1 Rolling equipment (manufacturing equipment for contour strips)
2 pedestal 3 feed mechanism part 4 pressing die (pressing body)
5 pressing mechanism portion 9 strip 40 lower end surface (pressing surface)
41 upper end surface 42 recess 43 lower end outer peripheral edge 44 recess peripheral surface 91 outer edge portion 92 side end surface 93 central portion

Claims (5)

A method for manufacturing a profile strip in which the center portion in the width direction is formed thicker than the outer edge portions,
While moving the strip in the longitudinal direction, a pressing body having a substantially conical concave portion on the pressing surface is repeatedly reciprocated in the thickness direction of the strip, so that the outer edge of the strip is pressed by the pressing surface. is pressed to roll the outer edge to a predetermined thickness. 2. The method of manufacturing a profile strip according to claim 1, wherein the pressing body is reciprocated at a position where the center of the recess is outside the side end surface of the strip. An apparatus for manufacturing a contoured cross-section strip in which the center portion in the width direction is formed thicker than the outer edge portion,
a feeding mechanism that moves the strip in the length direction;
a pressing body that presses the strip;
a pressing mechanism that reciprocates the pressing body in the thickness direction of the strip,
The pressing body is provided with a substantially conical concave portion on the pressing surface,
While moving the strip in the length direction, the pressing body is repeatedly reciprocated in the thickness direction, and the outer edge of the strip is pressed by the pressing surface, so that the outer edge of the strip is moved to a predetermined position. A device for manufacturing contoured cross-section strips, which is configured to roll to a thickness. 4. The apparatus for manufacturing a contour strip according to claim 3, wherein said pressing body is disposed at a position where the center of said recess is outside the side end face of said strip. 5. The apparatus for manufacturing a modified cross-section strip according to claim 3, wherein said pressing body has a planar portion capable of making surface contact with said strip material along the outer periphery of said recessed portion on said pressing surface.

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