JP2011000609A - Method and apparatus for manufacturing bar having irregular cross section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing bars having an irregular cross section, wherein the bars having the irregular cross section are manufactured accurately by filling a material in thicker sections sufficiently and at that time, the lowering of yield due to the loss of the material and the increase of the cost of equipment are not brought about.SOLUTION: The method manufactures the bars 8 having the irregular cross section, with a plurality of thick parts 7 and thin parts 6 arrayed in the width direction, by rolling the planar base stock 5 between a stepped roll 1 on which a plurality of large-diameter parts 3 and small-diameter parts 4 is alternately lined up and a flat roll 2 arranged in parallel to the stepped roll 1. When rolling the planar base stock 5 between the stepped roll 1 and the flat roll 2, at least a part of the end edge parts of the thick parts 7 is pressed inward in the width direction by projected line parts 12 projected from the small-diameter parts 4 while forming the thick parts 7 by the small-diameter parts 4 of the stepped roll 1, in both end parts in the width direction of the planar base stock 5.

Description

  The present invention relates to a method for manufacturing a deformed cross section formed with a thick portion and a thin portion aligned in the width direction, and a manufacturing apparatus therefor.

As is well known, for example, a deformed cross section made of a metal such as a copper alloy is used for a lead frame such as an LED or a power transistor. When manufacturing this modified cross-section strip, one set of rolls is a stepped roll in which a plurality of large-diameter portions and small-diameter portions are alternately arranged, and the other is a flat roll. By feeding and rolling, a deformed section having a thin part formed by the large diameter part and a thick part formed by the small diameter part is manufactured.
In forming such a modified cross-section strip, both side surfaces of the large-diameter portion are appropriately inclined surfaces. In this case, it is necessary to sufficiently fill the corner portion between the inclined surface and the surface of the small-diameter portion. However, at both end portions in the width direction (both side portions of the strip), the material has a free end. Because it is easy to flow, the thick part near the edge does not match the shape formed by the surface of the small diameter part of the roll and the inclined surface of the large diameter part, compared with the thick part of the central part in the width direction. There is a problem in that the corners are likely to have a bent shape.

In order to solve such a problem, there are technologies described in Patent Document 1 and Patent Document 2.
The technique described in Patent Document 1 is a stepped roll in which a plurality of large-diameter portions are arranged in the same cross-sectional shape, and at the most end positions in the width direction, between the thick portion at the center and the thin portions on both sides thereof. By forming an end-side thick part that continues from the thin part on the inclined surface at the same angle as the inclined surface, the end-side thick part becomes insufficiently filled with material, but the center part that becomes the product The thick-walled portion can be sufficiently filled with the material.
Moreover, in the technique described in Patent Document 2, in order to restrict the metal flow of the material at both ends in the width direction of the roll, the cross-sectional area of the thick part on the end side is changed to the cross-sectional area of the thick part on the center part. A metal flow restricting ridge that is higher than the ridge for forming the thin portion (large diameter portion), and a recess corresponding to the metal flow restricting ridge. By disposing, the rolling is not performed between the metal flow regulating ridges and the ridges, so that no material flows in.

JP-A-6-328153 JP-A-7-39979

  However, in the technique described in Patent Document 1, the end-side thick portion is a portion that cannot be used because the material is not sufficiently filled, and accordingly, a loss occurs in the material and the yield is poor. Further, in the technique described in Patent Document 2, since the portion formed by the metal flow regulating ridges and the ridges is not a part to be used, material loss is similar to the technique described in Patent Document 1. Therefore, it is difficult to form the metal flow so as not to reduce the yield, and high processing accuracy is required. Moreover, since both rolls have a stepped shape, there is a problem that equipment costs are increased.

  The present invention has been made in view of the above-described circumstances, and is capable of producing a deformed cross-section with sufficient accuracy by sufficiently filling the thick-walled portion with a reduction in yield and equipment costs due to material loss. It is an object of the present invention to provide a method and an apparatus for manufacturing an irregular cross-section without causing an increase or the like.

In the above prior art, an end-side thick part having the same shape as the product part is added to the outside of the product part (Patent Document 1), or a part formed by the metal flow regulating convex part and concave part. (Patent Document 2) is added to prevent the product part from generating an insufficiently filled part, and since there is a part to add other than the product part, the occurrence of material loss is inevitable. .
The thick part becomes insufficiently filled because the metal flows so that the material escapes in both ends in the width direction, and in order to solve this, the material is reversed on both ends in accordance with the amount of escape. It was thought that the dripping of the thick part could be prevented if it was made to flow so as to approach the thick part.

  That is, the method for producing a modified cross-section strip according to the present invention includes a flat plate material between a stepped roll in which a plurality of large-diameter portions and small-diameter portions are alternately arranged and a flat roll arranged in parallel with the stepped roll. In which a plurality of thick portions and thin portions are arranged in the width direction, and the flat plate material is rolled between the stepped roll and the flat roll. Further, at least one of the edge portions of the thick portion is formed by the protruding portion protruding from the small diameter portion while forming the thick portion by the small diameter portion of the stepped roll at both ends in the width direction of the flat plate material. It is characterized by pressing the portion toward the inside in the width direction.

  In this deformed cross section, in the step portion between the thick portion located at both ends in the width direction and the thin portion adjacent to the inside, the corner portion between the upper surface and the side surface of the thick portion (the thick portion) The end of the strip in the width direction on the inner side) tends to be thin. Therefore, at least a part of the edge portion of the thick portion is pressed toward the inner side in the width direction, and the material is brought from the end edge portion of the thick portion toward the corner portion on the inner side in the width direction. In this way, by causing the metal flow, the lack of the portion is prevented.

In the method for producing a modified cross-section strip of the present invention, an inclined surface that is inclined in a direction gradually approaching the side surface of the large-diameter portion is formed on the convex strip portion as it goes radially inward from the outer peripheral end thereof, The edge portion of the thick wall portion may be pressed by the inclined surface.
By pressing with the inclined surface, a metal flow is generated inward in the width direction.

In the method for manufacturing a modified cross-section strip according to the present invention, the depth of the edge groove formed by pressing the edge of the thick portion is set to 0. When the thickness of the thick portion is T. It is good to set in the range of 2 * T-0.9 * T.
By pressing the edge part of the thick wall part, a groove part is formed in that part. By setting the size of the edge groove part in the above range, the material of the part is directed to the corner part. Can flow effectively.

  The manufacturing apparatus for a modified cross-section strip of the present invention rolls a flat plate material between a stepped roll in which a plurality of large diameter portions and small diameter portions are alternately arranged and a flat roll arranged in parallel with the stepped roll. An apparatus for producing a deformed cross-section in which a plurality of thick portions and thin portions are arranged in the width direction, and thick at both ends of the flat plate material at both ends of the stepped roll. A small-diameter portion forming a portion is disposed, and the small-diameter portion has a larger diameter than the small-diameter portion, and a protruding strip portion that presses the edge portion of the thick-walled portion is adjacent to the small-diameter portion. The inclined surface is formed with a space from the side surface of the large-diameter portion, and is inclined on the ridge portion so as to gradually approach the side surface of the large-diameter portion as it goes radially inward from the outer peripheral end thereof. It is characterized by.

  By pressing the edge portion with the convex portion of the small diameter portion, a metal flow is generated toward the inner side in the width direction by the inclined surface, and the material is applied to the end portion on the inner side in the width direction of the thick portion. It is possible to prevent lack of meat.

  According to the present invention, since the metal flow is generated so that the edge portion of the thick portion is pressed to bring the material toward the corner portion on the inner side in the width direction, it is positioned at both ends in the width direction. In the thick-walled part, the material is brought close to the inner corner where thinning is likely to occur, preventing the lacking of the wall, and it is possible to manufacture the irregular section with sufficient accuracy by fully filling the material, and pressing the edge part. Since it is only processed, it is economical without causing a decrease in yield due to material loss and an increase in equipment cost.

It is a perspective view which shows the state which is rolling the flat raw material between the step roll and flat roll used in one Embodiment of the manufacturing method of the irregular cross-section strip which concerns on this invention. It is a longitudinal cross-sectional view which shows the rolling part of the stepped roll and flat roll of FIG. It is a front view of the stepped roll of FIG. It is a longitudinal cross-sectional view of the irregular cross-section manufactured by the method of one Embodiment, (a) is the state after rolling, (b) shows the state which cut off the both-ends edge part after rolling. It is a fragmentary sectional view which shows the modification about the protruding item | line part of a stepped roll.

Embodiments of the present invention will be described below with reference to the drawings.
First, an embodiment of an apparatus for manufacturing an irregular cross-section strip will be described.
As shown in FIG. 1, the manufacturing apparatus includes a step roll 1 and a flat roll 2. The step roll 1 has a shape in which a plurality of large diameter portions 3 having a radius R1 and a plurality of small diameter portions 4 having a radius R2 are alternately arranged in the width direction. By setting the uniform radius R3, the outer circumferential surface is a flat circumferential surface without irregularities. The two rolls 1 and 2 are arranged with a gap therebetween and the axes P1 and P2 being parallel to each other, and are configured to be rotationally driven by a drive mechanism (not shown). Then, by passing the flat plate material 5 between the stepped roll 1 and the flat roll 2, the thin portion 6 and the thick portion correspond to the large diameter portion 3 and the small diameter portion 4 of the stepped roll 1. 7 is formed.

  In the illustrated example, the stepped roll 1 includes three large-diameter portions 3 arranged in the width direction via small-diameter portions 4, and both end portions are small-diameter portions 4. Each large-diameter portion 3 has an outer peripheral surface formed in parallel to the direction of the axis P1, and as shown in FIGS. 2 and 3, the width of the large-diameter portion 3 gradually increases as both side surfaces 11 go radially inward. Thus, the inclined surface is inclined at a predetermined angle θ1 with respect to the radial direction, and the outer peripheral surface of the small diameter portion 4 is formed in parallel to the direction of the axis P1. Therefore, the angle formed by the corner portion between the outer peripheral surface of the small diameter portion 4 and the side surface 11 of the large diameter portion 3 is larger than 90 °, and the corner portion between the outer peripheral surface of the large diameter portion 3 and the side surface 11. Is formed to be larger than 90 °, and the large-diameter portion 3 is formed to have a trapezoidal cross section. Further, the outer peripheral surface of the large diameter portion 3 and the side surface 11 are chamfered with a radius of curvature r1 of, for example, 0.1 to 0.2 mm.

The small diameter portions 4 at both ends of the stepped roll 1 have a radius R4 that is smaller than the radius R1 of the large diameter portion 3 but larger than the radius R2 of the small diameter portion 4, and is slightly higher than the small diameter portion 4. A protruding ridge portion 12 is formed. The ridges 12 press the edge portions of the thick portions 7 formed at both ends in the width direction of the flat plate-like material 5.
In this case, the ridge portion 12 is configured to press the flat plate material 5 at the side edge portion located inward in the width direction of the stepped roll 1, and the side surface 13 of the portion is inward in the radial direction. The inclined surface is inclined at a predetermined angle θ2 with respect to the radial direction so as to approach the side surface 11 of the adjacent large-diameter portion 3 as it goes to the angle, and the angle between the side surface 13 and the outer peripheral surface is more than 90 °. Is also formed large. Further, chamfering is performed between the inclined surface 13 and the outer peripheral surface with a curvature radius r2 of 0.1 to 0.2 mm.
The angle θ1 of the side surface 11 of the large-diameter portion 3 and the angle θ2 of the side surface 13 of the ridge portion 12 are not particularly limited, but are preferably 5 to 60 °, and within the angle range, both The same angle may be set, or different angles may be set.

Next, a method for manufacturing the modified cross-section strip 8 from the flat plate material 5 by the manufacturing apparatus configured as described above will be described.
As shown in FIG. 1, when the flat plate material 5 is passed between the step roll 1 and the flat roll 2 and rolled, a thin portion 6 is formed by the large diameter portion 3 of the step roll 1, and the small diameter portion 4. Thus, the thick-walled portion 7 is formed, and the deformed cross-section strip 8 in which the thin-walled portions 6 and the thick-walled portions 7 are alternately arranged in the width direction is formed.

  In this case, as shown in FIG. 2, when the flat plate material 5 is compressed on the flat roll 2 by the large diameter portion 3 of the stepped roll 1, the flat plate material 5 is deformed into a deformed section strip 8. In the process, a metal flow is generated at the portion pressed by the large diameter portion 3 as indicated by a broken line arrow. Among these, in the part pressed by the outer peripheral surface of the large diameter part 3, from the thin part between the outer peripheral surface of this large diameter part 3 and the flat roll 2, between the adjacent small diameter part 4 and the flat roll 2 is provided. The material flows so as to wrap around the thick portion, and in the portion pressed by the side surface 11 of the large diameter portion 3, since the side surface 11 is an inclined surface, the large diameter portion 3 is interposed through the small diameter portion 4. The material flows toward the other adjacent large diameter portion 3. In such a metal flow, in the portion where the large diameter portion 3 is arranged on both sides of the small diameter portion 4, for example, the right half portion in FIG. Since the materials are pressed against each other toward the other large-diameter portion 3, the material is tightly filled in the groove-like portion formed between the large-diameter portion 3 and the small-diameter portion 4, so that the thickness is high. The part 7 can be formed.

  On the other hand, since the material is pressed by the side surface 11 of the large-diameter portion 3 on the inside of the small-diameter portion 4 (the left half portion in FIG. 2) located at both ends of the stepped roll 1, the ridge portion 12. If there is no material, the material will escape to the outside, and a thinned portion A as shown by a chain line will be formed between the large diameter portion 3 and the small diameter portion 4. By pressing the edge portion, as shown by the solid line arrow in FIG. 2, the material wraps between the small diameter portion 4 and the flat roll 2 between the outer peripheral surface of the ridge portion 12 and the flat roll 2. In addition, since the inner side surface 13 of the ridge portion 12 is an inclined surface, the side surface 13 presses the material toward the adjacent large diameter portion 3 via the small diameter portion 4.

Therefore, at both end portions in the width direction, the corner portion formed between the side surface 11 of the large diameter portion 3 of the stepped roll 1 and the outer peripheral surface of the small diameter portion 4 is also closely filled with the material, as described above. It is possible to reliably prevent the occurrence of the thin part A and to form the thick part 7 with high accuracy.
In addition, the edge groove part 14 slightly depressed as shown in FIG. 4A is formed at the edge part of the thick part 7 at both ends in the width direction by pressing with the protruding line part 12. However, the edge groove portion 14 may be cut off as shown in FIG. 4B or may be left in the range of 0 to 3 mm. In the case of leaving it, it is possible to position it with a processing machine or the like using this groove portion 14 in post-processing.

Thus, according to this manufacturing method, the edge part of the thick part 7 formed in the width direction both ends of the irregular cross-section strip 8 is pressed with the convex strip part 12, and it processes so that a material may be brought inside. Therefore, the corners on the inner side of the thick portion 7 are closely filled with the material, so that the highly accurate deformed cross section 8 can be manufactured.
In this case, as the modified cross-section strip 8, for example, the thickness of the thin portion 6 is 0.1 to 1 mm, the width is 0.3 to 30 mm, the thickness of the thick portion 7 is 0.3 to 3 mm, and the width is 0. .5-5 mm can be applied. Further, the processing of the edge portions at both end portions in the width direction is such that the thickness of the thick portion 7 is T, and the remaining thickness of the groove-like portion 14 at the edge portion is t. By setting it to the range of 9, the filling of the material to the corners of the thick part 7 can be improved. The width of the edge groove portion 14 may vary depending on the width of the thick portion 7, but may be set in the range of 1 to 10 mm.

The manufacturing method of the embodiment of the present invention has been described above, but the present invention is not limited to this embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the said embodiment, the side surface 13 used as an inclined surface was formed in the protruding item | line part 12, and the corner | angular part between the side surface 13 and an outer peripheral surface was chamfered with some curvature radius r2, but it shows in FIG. Like the convex strip 22 of the stepped roll 21, the radius of curvature r3 is further increased, and the entire area from the edge of the outer peripheral surface of the small diameter portion 4 to the edge of the outer peripheral surface of the convex strip 22 is a convex arc. It is good also as the side 23 used as a surface.
In short, the shape of the ridge portion is such that the side surface facing the inner side in the width direction of the stepped roll is inclined in a direction gradually approaching the side surface of the adjacent large diameter portion from the outer peripheral end toward the inner side in the radial direction. Any of a flat surface and a convex arc surface may be used.
Further, the number and dimensions of the thick and thin portions are not limited to the illustrated example, and the thickness and width of the plurality of thick portions may be set to the same size. These may be set to different dimensions.

DESCRIPTION OF SYMBOLS 1 Step roll 2 Flat roll 3 Large diameter part 4 Small diameter part 5 Flat material 6 Thin part 7 Thick part 8 Deformed cross section 11 Side surface (inclined surface)
12 ridges 13 side surface (inclined surface)
14 Grooved portion 21 Stepped roll 22 Convex portion 23 Side surface (inclined surface)

Claims (4)

  A plate-shaped material is rolled between a stepped roll in which a plurality of large-diameter portions and small-diameter portions are alternately arranged, and a flat roll arranged in parallel with the stepped roll, so that a plurality of thick portions and thin portions Is a method of manufacturing a deformed cross-section aligned in the width direction, when rolling the flat plate material between the stepped roll and the flat roll, at both ends in the width direction of the flat plate material, While forming the thick wall portion by the small diameter portion of the stepped roll, at least a part of the edge portion of the thick wall portion is pressed inward in the width direction by the protruding ridge portion protruding from the small diameter portion. The manufacturing method of the irregular cross-section strip characterized by the above-mentioned.   An inclined surface that is inclined in a direction gradually approaching the side surface of the large-diameter portion as it goes inward in the radial direction from the outer peripheral end thereof is formed on the protruding line portion, and the edge of the thick-walled portion is formed by the inclined surface. The method for producing a deformed section strip according to claim 1, wherein the portion is pressed.   The depth of the edge groove formed by pressing the edge of the thick portion is in the range of 0.2 × T to 0.9 × T, where T is the thickness of the thick portion. The method for producing a deformed cross-section according to claim 1 or 2, wherein   A plate-shaped material is rolled between a stepped roll in which a plurality of large-diameter portions and small-diameter portions are alternately arranged, and a flat roll arranged in parallel with the stepped roll, so that a plurality of thick portions and thin portions Is a device for producing irregular cross-sections arranged in the width direction, and a small diameter portion that forms a thick portion at both width direction ends of the flat plate material is disposed at both ends of the stepped roll. The small diameter portion has a larger diameter than the small diameter portion, and a protruding strip portion that presses the edge of the thick portion is spaced from the side surface of the large diameter portion adjacent to the small diameter portion. An irregularly-shaped cross section characterized in that an inclined surface is formed on the ridge portion and is inclined in a direction gradually approaching the side surface of the large diameter portion as it goes radially inward from the outer peripheral end thereof. Manufacturing equipment.

Images