JP2009028778A - Method of and device for producing stepped copper strip with deformed cross-section - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid continual occurrence of defective products in the production line of stepped copper strips with deformed cross-section by promptly detecting and grasping point by point in real time the occurrence of thickness defects caused by ruffling phenomenon, blushing or the like generated when rolling. <P>SOLUTION: A device for producing stepped copper strips with deformed cross-section includes a rolling mill and a laser displacement gauge 20 which is a thickness-measuring apparatus and is disposed in line with the rolling mill. After forming the stepped copper strip 12, the thickness of at least one among the thin and thick plate parts 9 and 10 of the strip 12 is continuously measured in line. At that time, adherence of oil mists such as those of a metal processing oil to the light-emitting or incident plane of laser light in the laser displacement gauge 20 is avoided by emitting a jet of air 25 from the tips of air nozzles 24 and 28. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a manufacturing method and a manufacturing apparatus for a stepped irregular cross-section copper strip used for, for example, a lead frame for a semiconductor package or a tape carrier.

Conventionally, a manufacturing method for manufacturing a stepped copper strip having a deformed cross section having a different thickness in the width direction and linearly continuous in the longitudinal direction by processing this type of flat copper strip, and a manufacture used for the same In the apparatus, a process for processing a flat copper strip into a stepped shape, an annealing process, finish stepped rolling, and the like are performed as main processes.
As a method of processing a flat copper strip to form a stepped irregular cross section having a thin plate portion and a thick plate portion, in general, a method of grinding and removing a predetermined portion, a groove roll and a flat roll alternately There are a rolling method and a special rolling method using a flat plate-shaped V-shaped die provided with V-shaped protrusions. Recently, for example, Patent No. 3520770 (Patent Document 1) and Patent No. 2756402 (Patent) Document 2) proposes a manufacturing method and apparatus by rolling using a flat plate-shaped V-shaped die, and it has become possible to manufacture a stepped irregular cross-section copper strip with high productivity.

  FIG. 10 is a view showing such a conventional flat plate-like V-shaped die. The flat plate-like V-shaped die (die) 100 includes V-shaped protrusions 200a and 200b that have a V-shaped divergent shape from the tip, and a groove portion 300 that is provided so as to penetrate substantially the central portion thereof. , Formed on the base 400. Flat base surfaces 500a and 500b are provided on both sides of the V-shaped projections 200a and 200b. The flat plate-like V-shaped die 100 is generally manufactured by a manufacturing method including a step of grinding a metal block material for producing a mold.

A flat copper strip material (not shown) to be processed is arranged on the surface of the flat plate-shaped V-shaped die 100 on which the V-shaped projection 200 is formed, and reciprocates on the flat copper strip material. By applying a pressing force with a moving pressing roll (not shown) or the like, the flat copper strip is pressed into a mold. Then, after the press-pressing process, a drawing process is performed in which the flat copper strip material is moved from the V-shaped tip of the mold to the rearwardly widened end (indicated by an arrow 700 in FIG. 6). By repeating this operation for each predetermined length, a portion of the flat copper strip that has passed through the groove 300 of the flat plate-shaped V-shaped die 100 is formed as a thick plate portion, and the flat plate-shaped V-shaped die is formed. A stepped irregular cross-section copper strip having a stepped irregular cross-sectional shape that is substantially linearly continuous over the entire length in the longitudinal direction is formed by forming a portion rolled through 100 V-shaped projections 200 as a thin plate portion. It is formed. In the processing process of the stepped irregular cross-sectional shape, the flat copper strip material to be processed is rolled along the V-shaped projection 200 from the front end of the V-shape toward the rear, so that the flat copper sheet is rolled. Of the strip material, the portion that passes through the V-shaped protrusion 200 (that is, the left and right side portions of the flat copper strip) is a thin plate portion. On the other hand, in the groove portion 300 of the flat plate-shaped V-shaped die 100, the V-shaped projection 200 is not provided, and the bottom surface is a flat surface continuous with the flat base surfaces 500a and 500b. The portion of the plate-shaped copper strip that has passed through passes through the flat plate-shaped V-shaped die 100 with the rolling amount being smaller than that of the V-shaped projection 200. Therefore, this portion becomes a thick plate portion.
In this way, a stepped deformed cross-section copper strip formed by mixing a thick plate portion and a thin plate portion in the width direction is manufactured with high productivity.

By the way, in recent years, particularly when manufacturing a stepped irregular cross-section copper strip used for a lead frame or a tape carrier for a semiconductor package, it is possible to further increase the width of the thin plate portion and further reduce the thickness thereof. It has come to be requested. This is because the lead parts such as lead frames and tape carriers must be further thinned in order to cope with further increase in the number of pins of the semiconductor package and further reduction in the pitch of the leads. In addition to this, since fine leads and the like must be produced with accurate dimensions, further improvement in the dimensional accuracy of the thickness of the thin plate portion is required.
In order to respond to such technical trends, the thickness of the stepped deformed cross section copper strip formed by rolling, particularly the thickness of the thin plate portion and the thickness of the thick plate portion, such as a thickness measurement check, etc. There is a strong demand for accurate checking and control by introducing such quality control processes. Therefore, it is necessary to accurately measure the thickness of the thin plate portion and the thickness of the thick plate portion in the step-shaped deformed cross-section copper strip manufactured by rolling as described above.

Here, as a general technique for measuring the thickness of a flat plate, a technique of measuring the thickness of a flat strip using a laser rangefinder is disclosed in, for example, Japanese Patent Application Laid-Open No. 2001-91213 (Patent Document 3). ). FIG. 9 is a diagram showing the main part of the apparatus configuration for measuring the thickness of a flat strip using such a conventional laser rangefinder.
Improved laser rangefinders 801a and 801b are arranged at both ends of a frame 800 having a substantially C-shaped outer shape (or “K” shape of Katakana). Each of the laser rangefinders 801a and 801b includes laser emitting units 802a and 802b and laser incident units 803a and 803b, and laser beams (also referred to as laser beams) emitted from the laser emitting units 802a and 802b; Similarly, 804a and 804b are set so as to be reflected by the surface of the measurement target flat strip 805 and to enter the laser incident portions 803a and 803b. Since the traveling path of the laser beams 804a and 804b changes corresponding to the thickness of the flat strip 805 to be measured, the thickness of the flat strip 805 is measured based on the change.

The thickness measuring apparatus as described above employs a so-called non-contact type measuring method. For example, although not shown, like the invention disclosed in Japanese Patent No. 1968435 (Patent Document 4). In addition, the thickness of the strip is measured based on the distance between the two rotating bodies that change according to the plate thickness by sandwiching the strip to be measured between the rotating bodies such as two rollers. Some have adopted a contact-type measurement method.
Alternatively, there is a drawback that the entire apparatus configuration becomes large, but there is also a technique of accurately measuring the thickness by irradiation of radiation (not shown).

Japanese Patent No. 3520770 Japanese Patent No. 2756402 JP 2001-91213 A Patent No. 1968435

However, in the conventional technology as described above, the thickness of the thin plate portion and the thickness of the thick plate portion in the stepped deformed cross-section copper strip for the semiconductor package, which is formed by the rolling process as described above, is in-line. There has been virtually no consideration for accurate checking and control. Alternatively, by simply diverting the conventional technology as described above, it is possible to accurately check the thickness of the thin plate portion and the thickness of the thick plate portion in-line in the stepped deformed cross-section copper strip for semiconductor packages. It was difficult.
That is, stepped irregular cross-section copper strips for semiconductor packages are generally manufactured by the so-called roll-to-roll method, so if a thickness defect occurs during rolling, it is immediately and real-time. If it cannot be detected and dealt with, then one lot of (in other words, one continuous strip) stepped profile copper strip material being manufactured at that time will be almost completely wasted (lost) as a defective product. There is a problem that it ends up. And in order to cope with such a problem, even if it is going to divert the conventional non-contact-type thickness measurement technique as proposed, for example in Unexamined-Japanese-Patent No. 2001-91213 as it is, an apparatus and measurement object will remain as it is. The size of the part is too large to be used in practice, so that it can appropriately handle minute width dimensions such as stepped irregular cross-section copper strip for semiconductor packages and thickness of thin plate parts. In addition, a technique capable of measuring the thickness in-line with the rolling process has not been proposed. The same was true for the same non-contact type radiation measuring method thickness measuring apparatus.

  In particular, in the manufacturing method of stepped irregular cross-section copper strips for semiconductor packages, so-called metalworking oil is applied in order to improve the flowability of the material during rolling. The oil mist easily adheres to the laser emitting surface and laser incident surface of the laser displacement meter, which becomes a fatal disturbance and causes a significant measurement error that cannot be ignored. There was a problem of being disturbed. For example, in the case of the laser rangefinder described above, if an oil film or oil droplet of metal processing oil is present on the surface of the measurement target part, the thickness of the oil film or oil drop is also the true thickness at that time. It will be measured as the thickness of the step-shaped irregular cross-section copper strip to be measured.

  In addition, in the rolling process employed in the method for manufacturing a stepped deformed cross-section copper strip for a semiconductor package as described above, generally, an intermittent drawing operation of a flat copper strip material is performed as described above. The entire continuous flat copper strip that is being processed vibrates greatly. For this reason, for example, when a contact-type measuring device using a roll as proposed in the above-mentioned Japanese Patent No. 1968435 is used, the surface of the stepped deformed section copper strip after contacting the roll is used. There is a problem that wrinkles such as streaks or dents remain, and the quality of the stepped irregular cross-section copper strip as a product is significantly impaired.

  The present invention has been made in view of such problems, and the object of the present invention is to first grasp in real time the occurrence of a thickness defect caused by a wavy phenomenon or fog generated during rolling. Stepped profile that can immediately detect the occurrence of such a thickness defect and avoid the occurrence of continuous defective products in the production line of the stepped profiled copper strip It is providing the manufacturing method and manufacturing apparatus of a cross-section copper strip.

  Second, it is possible to avoid the oil mist of the metal working oil from adhering to the laser beam emission surface and the incident surface of the laser displacement meter, and to realize accurate thickness measurement using the laser displacement meter. It is providing the manufacturing method and manufacturing apparatus of the step-shaped irregular cross-section copper strip which make it possible.

  Thirdly, the thickness of the thick plate portion and the thin plate portion of the stepped irregular cross-section copper strip by rolling is accurately adjusted so as to always fall within the desired tolerance range, and the stepped irregular cross section An object of the present invention is to provide a manufacturing method and a manufacturing apparatus for a step-shaped modified cross-section copper strip capable of manufacturing a copper strip.

  Fourth, the thickness of the stepped irregular cross-section copper strip is sandwiched between the treads of the two rolls without leaving a streak-like or dent-like crease on the surface of the step-shaped irregular cross-section copper strip. It is providing the manufacturing method and manufacturing apparatus of the step-shaped irregular cross-section copper strip which enable it to measure easily and correctly.

According to the first method of manufacturing a stepped irregular cross-section copper strip of the present invention, a V-shaped protrusion having a V-shaped diverging shape from the tip is formed on a flat base surface, and a tip of the V-shaped protrusion. The V-shaped protrusion of the flat plate-shaped V-shaped die was formed using a flat plate-shaped V-shaped die having a groove provided so as to pass through substantially the center of the V-shaped protrusion. After pressing the flat copper strip material to be processed against the surface and performing the press press processing, the flat copper strip material is moved from the V-shaped tip of the mold toward the rear end of the die. By performing a drawing process, a portion of the flat copper strip that has passed through the groove portion of the flat plate-shaped V-shaped die is formed as a thick plate portion, and the V-shaped protrusion of the flat plate-shaped V-shaped die is formed. A step including a rolling step in which a stepped deformed cross-section copper strip material is formed by forming a portion passing through a thin plate portion. A method of manufacturing a deformed cross-section copper strip material, wherein after forming the step-shaped cross-section copper strip material, the thickness of at least one of a thin plate portion or a thick plate portion of the step-shaped cross-section copper strip material The method further includes a measuring step of continuously measuring in-line after the rolling step.

  The manufacturing method of the 2nd step-shaped irregular cross-section copper strip of this invention is the manufacturing method of the said 1st step-shaped abnormal cross-section copper strip, The said flat copper used as the process object of the said rolling in the said rolling process. Metal processing oil is applied to the surface of the strip material, and in the measurement step, a laser displacement meter is used, and at least the laser displacement meter of the laser displacement meter is likely to fly to the incident surface and the incident surface. A step-shaped deformed cross-section copper strip that is subject to measurement of the thickness while injecting an air stream from an air injection nozzle so as to exclude oil mist of the metal working oil in a direction not adhering to the exit surface and the entrance surface The thickness is measured while jetting an air flow from an air jet nozzle so as to exclude the metal working oil remaining on the surface of the material from the portion to be measured for the thickness.

  According to the third method for producing a stepped irregular cross-section copper strip of the present invention, in the first or second stepped variant cross-section copper strip, the flat plate-like V-shaped die in the rolling step is provided. The pressing force for pressing the flat copper strip to be processed against the surface on which the V-shaped projections are formed is feedback-controlled corresponding to the measured value of the thickness.

  The fourth method for producing a stepped irregular cross-section copper strip of the present invention is the method for producing a stepped irregular cross-section copper strip of any one of the first to third aspects, wherein, in the measurement step, the diameter is 20 mm or more. The tire contour of the roll has a chamfered shape with a curvature radius of 4 mm or more at the tire shoulder, or a substantially linear tread surface with a radius of 0 mm to 2 mm. Using two rolls, the gap between the rolls displaced by sandwiching the stepped deformed cross-section copper strip material that is the object of the thickness measurement between the tread surfaces of the two rolls. Based on this, the thickness is measured.

  The first stepped modified cross-section copper strip manufacturing apparatus according to the present invention includes a V-shaped protrusion having a V-shaped diverging shape from the tip on a flat base surface, and a tip of the V-shaped protrusion. The V-shaped projection of the flat plate-shaped V-shaped die was formed using a flat plate-shaped V-shaped die having a groove portion provided so as to pass through substantially the central portion of the V-shaped projection. After pressing the flat copper strip material to be processed against the surface and performing the press press processing, the flat copper strip material is moved from the V-shaped tip of the mold toward the rear end of the die. By performing the drawing process, a portion of the flat plate-shaped copper strip that has passed through the groove portion of the flat plate-shaped V-shaped die is formed as a thick plate portion, and the V-shaped protrusion of the flat plate-shaped V-shaped die is formed. Stepped with a rolling device that forms a stepped deformed cross-section copper strip by forming the routed part as a thin plate part An apparatus for manufacturing an irregular cross-section copper strip, after the step-shaped irregular cross-section copper strip is formed, the thickness of at least one of the thin plate portion or the thick plate portion of the step-shaped irregular cross-section copper strip Is further provided with a measuring device arranged in-line with the rolling device on the downstream side of the rolling device so as to continuously measure in-line after the rolling process.

The manufacturing apparatus of the 2nd stepped irregular cross-section copper strip of this invention is a manufacturing apparatus of the said 1st stepped irregular cross-section copper strip, In the said rolling apparatus, the said flat copper strip used as the object of the said rolling Metal working oil is applied to the surface of the material, and the measuring device uses a laser displacement meter, and at least the laser displacement meter is configured to fly toward the laser light emission surface and the incident surface. An air injection nozzle that injects an air flow so as to eliminate oil mist of metal working oil in a direction not adhering to the exit surface and the entrance surface, and a stepped deformed cross-section copper strip that is a target of the thickness measurement An air injection nozzle for injecting an air flow so as to exclude metal processing oil remaining on the surface from the portion to be measured for the thickness, and measuring the thickness while injecting the air flow from the air injection nozzle Featured to do It is.

  The third stepped irregular cross-section copper strip manufacturing apparatus of the present invention is the above-described first or second stepped irregular cross-section copper strip manufacturing apparatus, wherein the flat plate-like V-shaped die in the rolling apparatus is the same. Feedback control is performed on the pressing force for pressing the flat copper strip to be processed against the surface on which the V-shaped protrusions are formed, corresponding to the measured value of the thickness measured by the measuring device. It is characterized by.

  According to the fourth aspect of the present invention, there is provided the manufacturing apparatus for the stepped irregular cross-section copper strip material according to any one of the first to third steps, wherein the measuring device has a diameter of 20 mm or more. The tire contour of the roll has a chamfered shape with a curvature radius of 4 mm or more at the tire shoulder, or a substantially linear tread surface with a radius of 0 mm to 2 mm. The distance between the rolls that is displaced by sandwiching the stepped deformed cross-section copper strip material that is the object of the thickness measurement between the tread surfaces of the two rolls using at least two rolls that are Based on the above, the thickness is measured.

  According to the present invention, after forming the stepped irregular cross-section copper strip, the thickness of at least one of the thin plate portion or the thick plate portion of the stepped irregular cross-section copper strip is continuously applied after rolling. Since the measurement is performed in-line, it is possible to grasp in real time the occurrence of a thickness defect caused by a wavy phenomenon or fogging that occurs during rolling. As a result, it is possible to immediately detect the occurrence of a thickness defect and to avoid the occurrence of a continuous (and therefore a large amount) of defective products in the production of a stepped profile copper strip.

  In particular, in the rolling process described above, metal working oil is applied to the surface of the flat copper strip to be rolled, and a laser displacement meter is used in the measurement process, and at least the laser in the laser displacement meter is used. In order to eliminate the oil mist of metal working oil that is going to fly from the surface of the stepped irregular cross-section copper strip with respect to the light exit surface and the entrance surface, so as not to adhere to the exit surface and the entrance surface, Air injection from the air injection nozzle so that the metal working oil remaining on the surface of the stepped deformed cross-section copper strip that is the target of thickness measurement is excluded from the part that is the target of thickness measurement. Since the thickness is measured while jetting the airflow from the nozzle, it is possible to avoid the oil mist of the metal working oil from adhering to the laser beam emission surface and the incident surface of the laser displacement meter. Thickness measurement It is possible to realize the real-time rolling and in-line. Further, depending on the setting of the injection direction, the injection amount, etc., it is possible to obtain an advantage that the heat generated by the laser displacement meter can be cooled by air.

  Further, in particular, in the above rolling process, the pressing force that presses the flat copper strip to be processed against the surface on which the V-shaped projections of the flat plate-shaped V-shaped die are formed is a measured value of the thickness. Since the feedback control was performed correspondingly, the thickness of the thick plate and thin plate of the stepped irregular cross-section copper strip by the above rolling process was adjusted accurately so that it would always fall within the desired tolerance range. However, it becomes possible to manufacture the stepped irregular cross-section copper strip.

  In particular, in the above thickness measurement, the outer shape is a substantially tire-shaped roll having a diameter of 20 mm or more, and the tire contour of the roll has a chamfered shape with a curvature radius of 4 mm or more on the tire shoulder. Two rolls having a shape having a substantially linear tread surface of 0 mm or more and 2 mm or less together with it, and a stepped irregular cross-section copper strip to be measured between the tread surfaces of the two rolls By sandwiching the material, the thickness of the part to be measured is measured based on the distance between the rolls that are displaced corresponding to the thickness of the stepped deformed cross-section copper strip of the part sandwiched. Since it did in this way, it becomes possible to measure the thickness of the site | part of measurement object simply and correctly, without leaving a streak-like wrinkle etc. on the surface of the step-shaped irregular cross-section copper strip of measurement object.

Hereinafter, the manufacturing method and manufacturing apparatus of the step-shaped irregular cross-section copper strip which concern on embodiment of this invention are demonstrated with reference to drawings.
FIG. 1 is a view showing a part of a measuring device, particularly a part of a measuring device, in the step-shaped modified cross-section copper strip manufacturing apparatus according to the first embodiment of the present invention, and FIG. FIG. 3 is an extracted view, and FIG. 3 is a view specifically showing a portion of the measuring device in the stepped irregular cross-section copper strip manufacturing apparatus according to the second embodiment of the present invention. FIG. FIG. 5 shows a tire-like roller used, and FIG. 5 is a flat plate-like V-shape used in the method for manufacturing a stepped irregular cross-section copper strip according to the first embodiment and the second embodiment of the present invention. FIGS. 6 and 7 are a side view and a plan view, respectively, schematically showing a rolling process performed using the flat plate-like V-shaped die shown in FIG. 5.

<First Embodiment>
As shown in FIGS. 1 (a) and 1 (b), the measuring device used in the stepped irregular cross-section copper strip manufacturing apparatus according to the first embodiment includes a laser displacement meter 20 and a case. 21, air chambers 22 and 26, air supply ducts 23 and 27, and air nozzles 24 and 28 are provided as main parts. This measuring device is installed in-line with the rolling device as a device for performing a thickness measuring step, which is a later process than the rolling device as shown in FIG.
Here, Fig.1 (a) is the side view seen from the direction orthogonal to the line advancing direction (shown by the arrow 7; the same applies hereafter) of the stepped irregular cross-section copper strip material 12, b) is a front view seen from the direction facing the traveling direction. In addition, this measuring device is provided symmetrically on both the front and back (upper and lower) surfaces with the stepped irregular cross-section copper strip 12 as a symmetric surface, so that each part on the upper surface side has 20a, 21a, 22a. . . In this way, all the reference numerals are indicated by a, and each part on the lower surface side has 20b, 21b, 22b. . . In this way, all numerals are denoted by b.

  The laser displacement meter 20 is accommodated in the case 21. The laser displacement meter 20 accurately measures the thickness of a predetermined portion such as a thin plate portion or a thick plate portion in a step-shaped modified cross-section copper strip 12 having a narrow strip width such as a semiconductor package lead frame or carrier tape. The measuring operation itself may be the same as that of a laser displacement meter that measures the thickness in a non-contact manner using a general laser beam.

The case 21 is a sealed container made of, for example, a transparent acrylic member, and the laser displacement meter 20 is hermetically accommodated therein.
Air chambers 22 and 26 are attached to the outer surface of the case 21. Air supply ducts 23 and 27 and air nozzles 24 and 28 are attached to the air chambers 22 and 26, respectively.
Air (airflow) 25 sent from an air supply source (not shown) at a predetermined pressure is temporarily stored in the air chamber 22 via the air supply duct 23. Further, the air is pushed out of the air chamber 22 and is ejected from the tip through the air nozzle 24. Similarly, the air (airflow) 25 is temporarily stored in the air chamber 26 via the air supply duct 27. Further, the air is pushed out from the air chamber 26 and is ejected from the tip through the air nozzle 28.

The air 25 ejected from the air nozzle 24 can remove the metal working oil remaining on the surface of the stepped deformed cross-section copper strip 12 that is the target of thickness measurement from the portion that is the target of thickness measurement. It is injected as an air flow set at an appropriate flow velocity and direction as possible. In this embodiment, the direction is set so as to be jetted in a direction reverse to the line traveling direction of the step-shaped modified cross-section copper strip 12 at a predetermined angle.
However, if the air 25 to be injected from the air nozzle 24 is made too strong (or a high flow rate or a high speed), the metal working oil remaining on the surface of the stepped deformed cross section copper strip 12 may be blown off as fine droplets. If the oil mist becomes trapped in the measurement environment, it becomes a disturbance factor of the thickness measurement by the laser beam, which may have an adverse effect. Therefore, the air 25 ejected from the air nozzle 24 can exclude the metal working oil remaining on the surface of the stepped irregular cross-section copper strip 12 from the position irradiated with the laser beam for measurement to the periphery thereof. It is desirable to set the air flow as weak as possible within a range that can secure a certain degree of force.

  The air 25 ejected from the air nozzle 28 rises from the surface of the stepped deformed cross-section copper strip 12 with respect to the laser beam emission surface and the incident surface of the laser displacement meter 20, and is a metal working oil that is about to fly. The oil mist is not attached to the laser light emitting surface and the incident surface of the laser displacement meter 20 in a direction parallel to the line traveling direction of the stepped irregular cross-section copper strip 12 (in other words, the laser in the laser displacement meter 20). It is ejected as an air flow set at an appropriate flow velocity and direction so that it can be blown away in a direction parallel to the light exit surface and the light entrance surface.

  In the present embodiment, further, the air chambers 22 and 26 attached to the outer surface of the case 21 are continuously sent from the outside by the air 25 and the laser displacement meter 20 inside the case 21 through the entire case 21. It also has the function of air-cooling.

As described above, in the measuring apparatus according to the present embodiment, the metal working oil remaining on the surface of the stepped deformed cross-section copper strip 12 to be measured for the thickness is measured by the air 25 injected from the air nozzle 24. It can be excluded from the portion that is the target of thickness measurement. Further, the oil mist of the metal working oil that rises from the surface of the stepped deformed cross section copper strip 12 by the air 25 ejected from the air nozzle 28 is emitted from the laser displacement meter 20. It can be blown away so as not to adhere to the surface and the incident surface. As a result, it is possible to eliminate the occurrence of thickness measurement errors caused by the oil mist adhering to the laser light exit surface and the incident surface of the laser displacement meter 20 and the presence of oil mist embedded in the measurement environment. It becomes possible to realize accurate measurement of the thickness of the thin plate portion 9 and the thick plate portion 10 in the cross-section copper strip 12.
In addition, since the laser displacement meter 20 that is likely to cause malfunction or failure due to heat generation or heat storage because it is generally used continuously in a production line, it can be air-cooled with the supply of air 25, As a result, the long-term durability (or so-called life) of the laser displacement meter 20 can be further improved, and the occurrence of malfunction caused by heat of the laser displacement meter 20 can be eliminated.

Here, the rolling process performed with the rolling apparatus in the manufacturing apparatus of the step-shaped irregular cross-section copper strip which concerns on this Embodiment is demonstrated.
As shown in FIG. 5, the flat plate-shaped V-shaped die 1 has V-shaped protrusions 2a and 2b that have a V-shaped divergent shape from the tip, and a groove provided so as to penetrate substantially the center thereof. 3 is provided on the flat upper surface of the base 4.
As shown in FIG. 5, the planar shape of the V-shaped protrusions 2 a and 2 b is V-shaped from the sharp tip to the end, and the groove 3 is provided so as to penetrate the center. Yes. The slopes 11a and 11b constituting the V-shaped outer shape of the V-shaped protrusions 2a and 2b are moderate so that the flat copper strip material to be processed can be smoothly rolled. A tilt angle is given.
Flat base surfaces 5a and 5b are exposed on both sides of the V-shaped projections 2a and 2b. The base surfaces 5a and 5b and the bottom surface of the groove 3 are continuous as the same plane. In other words, the base surfaces 5a, 5
b and the bottom surface of the groove portion 3 have the same height.
The flat plate-like V-shaped die 1 is produced by grinding a metal block material for producing a mold, for example.

As shown in FIG. 6, the flat copper strip 6 to be processed is pressed against the surface of the flat V-shaped die 1 on which the V-shaped projection 2 is formed by the pressing roll 8. A predetermined pressing pressure is applied to perform so-called press pressing with the V-shaped protrusion 2. At this time, the pressing roll 8 applies a pressing force to press the flat copper strip 6 against the flat V-shaped die 1 while reciprocating along the longitudinal direction of the flat copper strip 6. ing. Subsequently, in conjunction with the movement of the pressing roll 8, the flat copper strip 6 is moved backward from the V-shaped tip of the V-shaped protrusion 2 to the rear end along the longitudinal direction (FIGS. 1 and 2). 3 in the direction indicated by the arrow 7 in FIG.
Then, by passing through the V-shaped protrusion 2 of the flat plate-shaped V-shaped die 1 in the flat-plate-shaped copper strip 6, the width direction of the flat copper strip 6 along the shape of the end of the V-shaped protrusion 2 is widened. And the part thinned by extending (rolling) in the longitudinal direction of the flat copper strip 6 becomes thin plate part 9a, 9b. On the other hand, the portion of the flat copper strip 6 that has passed through the groove 3 of the flat plate-shaped V-shaped die 1 passes through the flat plate-shaped V-shaped die 1 with a much smaller rolling amount than the V-shaped projection 2. Therefore, this portion becomes the thick plate portion 10.
In this way, a stepped deformed cross-section copper strip formed by mixing the thin plate portions 9a and 9b and the thick plate portion 10 in the width direction is manufactured.

In this stepped irregular cross-section processing process, as shown in FIG. 7, the flat copper strip 6 to be processed passes along the V-shaped protrusion 2 from the tip of the V-shape through the inclined surface 11 and thereafter. By rolling toward the end, the portions of the flat copper strip 6 that have passed through the V-shaped projections 2 become thin plate portions 9a and 9b.
In such a rolling process, the thickness of the thin plate portion 9 and the thick plate portion 10 of the finished step-shaped deformed cross-section copper strip 12 changes depending on the so-called pressing amount. In other words, by performing feedback control of the thickness with the amount of pushing as the manipulated variable, the variation (error) in the thickness of the stepped deformed cross-section copper strip 12 is suppressed within an allowable range, and the thickness is always accurate. It is possible to manufacture the step-shaped irregular cross-section copper strip 12.
That is, the thickness of the thin plate portion 9 and the thick plate portion 10 of the stepped irregular cross-section copper strip 12 is measured by the measuring device as described above, and the flat plate-like V-shaped die 1 is pushed in based on the measured value. By performing feedback control of the amount, an accurate rolling process in which the thickness error (variation) is always within a predetermined allowable error range is realized.

As shown in FIG. 2, the flat plate-shaped V-shaped die 1 is set so as to be attached to the upper surface of the mold mounting base 31. Slide guide angle members 32 and 33 are provided at the four corners of the mold mounting base 31 for smooth movement of the mold mounting base 31 in the vertical direction. The slide guide angle members 32 and 33 are fixed to the base 34. A vertical movement actuator 35 is connected to the lower surface of the mold mounting base 31. The mold mounting base 31 is set to move in parallel in a vertical direction to a predetermined position when the vertical movement actuator 35 moves up and down. Feedback control of adjusting the vertical position of the flat plate-shaped V-shaped die 1 to an appropriate position by moving the vertical actuator 35 up and down based on the thickness value measured by the measuring device. I do. As a more specific qualitative control rule for the feedback control, when the measured thickness is smaller (thin) than a predetermined target value, the vertical movement actuator 35 is moved downward by an appropriate distance. The distance between the flat plate-shaped V-shaped die 1 and the roll 8 is set to be larger by being moved over the distance. On the other hand, when the measured thickness is larger (thick) than a predetermined target value, the vertical movement actuator 35 is moved upwardly over an appropriate distance, so that a flat plate-like V shape is obtained. The distance between the die 1 and the roll 8 is made smaller. Here, it goes without saying that various quantitative settings in the feedback control system can conform to the settings of a general feedback group system.

  Thus, the pressing force that presses the flat copper strip 6 to be processed against the surface on which the V-shaped projection 2 of the flat plate-shaped V-shaped die 1 is formed in the rolling process is used as a measurement value of the thickness. By correspondingly performing feedback control, an error in the thickness of the thin plate portion 9 and the thick plate portion 10 of the stepped deformed cross-section copper strip 12 formed by rolling is always within a predetermined allowable error range, It becomes possible to realize the production of the step-shaped deformed cross-section copper strip 12 having the thin plate portion 9 and the thick plate portion 10 having a constant thickness.

<Second Embodiment>
As shown in FIG. 3, the measuring device used in the manufacturing apparatus for the stepped irregular cross-section copper strip according to the second embodiment includes a pair of rolls 40a and 40b and arms 41a and 41b. A spring 42, a support member 43, a reflection plate 44, and a laser displacement meter 45 are provided as main parts.

  The laser displacement meter 45 is fixedly attached to the arm 41a. The arm 41 a is pivotally supported by the support member 43. A hard roll 40a made of a metal having a substantially outer shape is pivotally supported at the tip of the arm 41a so as to be rotatable. Similarly, the arm 41 b is pivotally supported by the support member 43. A hard roll 40b made of a metal having a substantially outer shape is pivotally supported at the tip of the arm 41b so as to be rotatable. A reflecting plate 44 is fixedly attached to the arm 41b. A spring 42 is suspended between the arm 41a and the arm 41b so that the arms 40a and 40b are pressed against each other with a predetermined pressing force by the arms 41a and 41b pulling each other. Has been.

  By sandwiching the stepped deformed cross-section copper strip 12 to be measured between the roll 40a and the roll 40b that are respectively supported by the tip of the arm 41a and the tip of the arm 41b, the step of the sandwiched portion The distance between the roll 40a and the roll 40b changes in accordance with the thickness of the attached irregular cross-section copper strip 12. Along with this change, the overall posture of the laser displacement meter 45 fixed to the arm 41a and the reflection plate 44 fixed to the arm 41b changes. The path of the laser beam 46 that is reflected and returns to the laser displacement meter 45 again changes. Corresponding to the change, the thickness of the stepped deformed cross-section copper strip 12 at the portion sandwiched between the roll 40a and the roll 40b is measured as the measurement target at that time.

  More specifically, the roll 40 is made of a substantially tire-like metal having a diameter 49 of 20 mm or more, and has a tire contour (tire-like cross-sectional shape) as shown in FIG. That is, the shoulder portion of the tire contour has an arc-shaped chamfered shape with a curvature radius 48 of 4 mm or more. A substantially linear (flat) tread 47 is provided between the arcs of the shoulders over a length of 0 mm to 2 mm.

  If the outer shape of the rolls 40a and 40b is small, the distance between the axes of the rolls 40a and 40b becomes small, and there is a problem that the edge of the stepped deformed cross-section copper strip 12 contacts the vicinity of the ends of the arms 41a and 41b. There is a risk that it is likely to occur. Further, since the stepped irregular cross-section copper strip 12 is intermittently pulled out in the rolling process, any vibration is always generated from the leading end to the rear end of the continuous stepped irregular cross-section copper strip 12. It is often transmitted. Therefore, if the mechanical rigidity of the attachment portions (shaft support portions) of the rolls 40a and 40b is weak, there is a risk that measurement errors will increase due to bending caused mainly by vibrations associated with the rolling process. In order to avoid the occurrence of such a measurement error, it is desirable that the diameters of the rolls 40a and 40b be 20 mm or more.

  Moreover, in order not to wrinkle the surface of the step-shaped irregular cross-section copper strip 12 in contact with the rolls 40a, 40b, the shoulder chamfered shape in the tire-like cross-sectional shape of the rolls 40a, 40b is used. It is desirable that the radius of curvature 48 be 4 mm or more. On the contrary, if the shoulder portion is sharpened without providing a chamfered shape having a radius of curvature 48, or if the radius of curvature 48 is less than 4 mm, the surface of the stepped irregular cross-section copper strip 12 is likely to be wrinkled. Because it becomes.

In addition, by providing a tread 47 having a linear cross-sectional shape with a length between both shoulders, the area where the tread 47 comes into contact with the surface of the stepped deformed cross-section copper strip 12 increases, so the rolls 40a and 40b are pushed. The surface pressure at the time of contact is dispersed, and it becomes possible to more reliably avoid the wrinkling of the surface of the stepped irregular cross-section copper strip 12. Therefore, theoretically, it is desirable that the length of the tread surface 47 is as large as possible.
However, if this length becomes larger than 2 mm, it becomes easy to pick up an error in the thickness within the range over the length, and there is a significant increase in the possibility that the error will be mixed into the measured value. Since it was confirmed, it is desirable that the length of the straight line portion is 2 mm or less. Here, the lower limit value of the length of the straight portion varies depending on various conditions such as the hardness of the surfaces of the rolls 40a and 40b and the stepped deformed cross-section copper strip 12 and the coefficient of friction between the two. Therefore, in practice, for example, it is desirable to confirm the minimum value by an experiment or the like in advance before entering the production line. Alternatively, if the width of the rolls 40a and 40b is so narrow that there is no room for providing the straight line portion, the tread surface 47 may be formed into a curved surface having a radius of curvature of 4 mm or more, such as the shoulder portion. Good.

According to the manufacturing apparatus for a stepped irregular cross-section copper strip material according to this embodiment and the method for manufacturing a stepped irregular cross-section copper strip material executed using the same, the roll 40a and the roll 40b are respectively measured. Since the thickness of the stepped deformed cross-section copper strip 12 is measured by bringing it into contact with the front and back of the subject stepped deformed cross-section copper strip 12, metal processing oil or the like remains on the front and back of the stepped deformed cross section copper strip However, there is no possibility of measurement errors due to the presence of the oil film or oil mist of the metal processing oil. For this reason, in the manufacturing apparatus and the manufacturing method according to the present embodiment, the oil mist removing nozzle and the oil film removing nozzle, air injection, and the like can be omitted at all, and an accurate thickness can be obtained by an extremely simple apparatus configuration. Measurement can be realized.
Moreover, the thickness of the region to be measured can be accurately measured without leaving a streak or the like on the surface of the stepped irregular cross-section copper strip 12 to be measured.
In this embodiment, the case where the groove portion 3 of the flat plate-shaped V-shaped die 1 is provided so as to divide right and left through the center of the V-shaped protrusion 2 has been described. In addition, it is possible to provide two or more. That is, the V-shaped protrusion 2 is divided into three or more, and two or more thick plate portions 10 and three or more thin plate portions 9 are provided in the width direction of the single flat copper strip 6. It is also possible to do so.

<First embodiment>
A manufacturing apparatus for a stepped irregular cross-section copper strip provided with a rolling apparatus and a measuring apparatus as described in the first embodiment is experimentally manufactured, and a flat copper strip is processed using the apparatus. Then, a stepped irregular cross-section copper strip was manufactured.
FIG. 8 is a diagram collectively showing the error rate of the thickness of the stepped irregular cross-section copper strip manufactured in the first example.

The air nozzle 24 was a pipe having an inner diameter of 1.5 mm. The distance between the air outlet at the tip of the air nozzle 24 and the surface of the stepped irregular cross-section copper strip 12 was about 20 mm. The supply pressure of the air 25 to the air nozzle 24 was about 0.2 MPa.
The air nozzle 28 was a rectangular duct having an elongated cross section having an air outlet having a width of 8 mm and a length of 0.8 mm. The supply pressure of the air 25 to the air nozzle 28 was about 0.4 MPa.
As the laser displacement meter, LK-G35 (product name) of Keyence Corporation (name of company) was used.

A sample is taken at the beginning and end of rolling of the step-shaped irregular cross-section copper strip 12 manufactured in-line, and a high-precision micrometer is provided separately from the real-time thickness measurement by the measuring apparatus according to this embodiment. The thickness of the thin plate portion 9 of the step-shaped irregular cross-section copper strip 12 was measured, and the measured value was regarded as a true value, and the error rate of the thickness measurement by the measuring apparatus according to the present embodiment was calculated. . This error rate is the absolute value of the difference between the measurement value obtained by the high-precision micrometer and the measurement value obtained by the measurement device according to this embodiment, expressed as a percentage based on the measurement value obtained by the high-precision micrometer. Calculated as:
Error rate (%) = (Measured value with high-precision micrometer-Measured value with measuring device) x 100 / Measured value with high-precision micrometer

Such an error rate experiment was conducted over a total of three days (three times).
As a result, as shown in FIG. 8, the error rate is 0.94 at the end of the first day at the maximum, and both are less than 1%, realizing sufficiently practical and highly accurate thickness measurement. It was confirmed that it was possible.

<Second Embodiment>
A manufacturing apparatus for a stepped deformed cross-section copper strip having a measuring apparatus as described in the second embodiment and a rolling apparatus similar to that of the first example was experimentally manufactured. A flat copper strip was processed to produce a stepped irregular cross-section copper strip.

The diameter 49 of the roll 40 was 30 mm. The radius of curvature 48 of the chamfered shape was 4 mm. The roll thickness was 8 mm. That is, in the present embodiment, the tread surface 47 having a linear cross-sectional shape is not provided, and instead the tread surface has a curved shape with a curvature radius of 4 mm.
As a result, it was confirmed that an accurate thickness measurement can be easily realized without leaving any streak-like wrinkles or the like on the surface of the stepped deformed section copper strip 12.

It is a figure which extracts and shows especially the part of a measuring device in the manufacturing apparatus of the step-shaped irregular cross-section copper strip which concerns on the 1st Embodiment of this invention. It is a figure which extracts and shows especially the part of the rolling apparatus in the manufacturing apparatus of the step-shaped irregular cross-section copper strip which concerns on the 1st Embodiment of this invention. It is a figure which extracts and shows especially the part of a measuring device in the manufacturing apparatus of the step-shaped irregular cross-section copper strip which concerns on the 2nd Embodiment of this invention. It is a figure which shows the tire-shaped roller used for the measuring apparatus shown in FIG. It is a figure which shows the flat disk-shaped V type | mold die used for the manufacturing method of the step-shaped odd-shaped cross-section copper strip which concerns on the 1st Embodiment of this invention and the 2nd Embodiment. It is a side view which shows typically the rolling process performed using the flat disk-shaped V type | mold die shown in FIG. It is a top view which shows typically the rolling process performed using the flat disk-shaped V type | mold die shown in FIG. It is a figure which shows collectively the error rate of the thickness of the stepped irregular cross-section copper strip manufactured in the 1st Example. It is a figure which shows the principal part of the apparatus structure which measures the thickness of a flat strip using the conventional laser rangefinder. It is a figure which shows the conventional flat disk-shaped V type | mold die.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flat plate-shaped die | dye 2 V-shaped protrusion 3 Groove part 4 Base 5 Base surface 6 Flat copper strip 8 Pressing roll 9 Thin plate part 10 Thick plate part 11 Slope 20 Laser displacement meter 21 Cases 22, 26 Air chamber 23, 27 Air supply duct 27
24, 28 Air nozzle 25 Air 31 Mold mounting base 32, 33 Slide guide angle member 34 Base 35 Vertical movement actuator 40 Roll 41 Arm 42 Spring 43 Support member 44 Reflector plate 45 Laser displacement meter

Claims (8)

On a flat base surface, a V-shaped protrusion having a V-shaped divergent shape from the tip and a substantially central portion of the V-shaped protrusion from the tip of the V-shaped protrusion to the rear are provided. Pressing press processing of pressing a flat copper strip material to be processed against the surface on which the V-shaped projections of the flat plate-shaped V-shaped die are formed using a flat plate-shaped V-shaped die having a groove portion formed And performing the press-pressing process, and then performing a drawing process to move the flat copper strip material from the V-shaped tip of the mold to the rearwardly spreading rear end, thereby the flat plate of the flat copper strip material. A stepped deformed cross-section copper strip is formed by forming a portion passing through the groove portion of the V-shaped die as a thick plate portion and forming a portion passing through the V-shaped projection of the flat plate-shaped V die as a thin plate portion. A method for producing a stepped irregular cross-section copper strip including a rolling step to form
After forming the stepped irregular cross-section copper strip, the thickness of at least one of the thin plate portion or the thick plate portion of the stepped irregular cross-section copper strip is continuously measured in-line after the rolling step. The manufacturing method of the step-shaped irregular cross-section copper strip characterized by further including a measurement process. In the manufacturing method of the step-shaped irregular cross-section copper strip of claim 1,
In the rolling step, metal working oil is applied to the surface of the flat copper strip material to be processed in the rolling,
In the measurement step, a laser displacement meter is used, and at least the oil mist of the metal working oil that is about to fly to the emission surface and the incident surface of the laser beam in the laser displacement meter is used as the emission surface and the incident surface. In addition to injecting an air flow from the air injection nozzle so as to eliminate it in a direction not adhering to the metal, the metal working oil remaining on the surface of the stepped deformed cross-section copper strip to be measured for the thickness is measured. A method of manufacturing a stepped irregular cross-section copper strip, wherein the thickness is measured while jetting an air flow from an air jet nozzle so as to be excluded from a target portion. In the manufacturing method of the step-shaped irregular cross-section copper strip of Claim 1 or 2,
In the rolling process, the pressing force that presses the flat copper strip material to be processed against the surface on which the V-shaped projection of the flat plate-shaped V-shaped die is formed corresponds to the measured value of the thickness. And a step-shaped modified cross-section copper strip material manufacturing method. In the manufacturing method of the step-shaped irregular cross-section copper strip of any one of Claims 1 thru | or 3,
In the measurement step, the roll is a substantially tire-shaped roll having a diameter of 20 mm or more, and the tire contour of the roll has a chamfered shape having a curvature radius of 4 mm or more on the tire shoulder, or 0 mm or more and 2 mm or less together therewith. Using two rolls having a substantially linear tread surface, and sandwiching a stepped irregular cross-section copper strip that is the object of thickness measurement between the tread surfaces of the two rolls. The thickness is measured based on the interval between the rolls that are displaced at a step. Provided on a flat base surface so as to penetrate through a V-shaped projection having a V-shaped diverging shape from the tip, and through substantially the center of the V-shaped projection from the tip of the V-shaped projection to the rear. Pressing press processing of pressing a flat copper strip material to be processed against the surface on which the V-shaped projections of the flat plate-shaped V-shaped die are formed using a flat plate-shaped V-shaped die having a groove portion formed And performing the press-pressing process, and then performing a drawing process to move the flat copper strip material from the V-shaped tip of the mold to the rearwardly widened portion, thereby the flat plate of the flat copper strip material. A stepped irregular cross-section copper strip is formed by forming a portion passing through the groove portion of the V-shaped die as a thick plate portion and a portion passing through the V-shaped projection of the flat plate-shaped V die as a thin plate portion. An apparatus for manufacturing a stepped irregular cross-section copper strip with a rolling device to be formed,
After the stepped deformed cross section copper strip is formed, the thickness of at least one of the thin plate portion and the thick plate portion of the stepped deformed cross section copper strip is continuously measured in-line after the rolling process. Thus, the manufacturing apparatus of the step-shaped irregular cross-section copper strip characterized by further providing the measuring device arrange | positioned in-line with the said rolling mill in the said line downstream of the said rolling mill. In the manufacturing apparatus of the step-shaped irregular cross-section copper strip of claim 5,
In the rolling apparatus, metal working oil is applied to the surface of the flat copper strip material to be rolled,
The measuring device uses a laser displacement meter, and at least the oil mist of the metal working oil that is about to fly to the emission surface and the incident surface of the laser beam in the laser displacement meter. An air injection nozzle that injects an air flow so as to exclude it in a direction not adhering to the surface, and a metal processing oil remaining on the surface of the stepped deformed cross-section copper strip that is the object of the thickness measurement. A stepwise deformed cross-section copper strip material, comprising: an air injection nozzle that injects an air flow so as to be excluded from a portion to be, and measuring the thickness while injecting the air flow from the air injection nozzle Manufacturing equipment. In the manufacturing apparatus of the step-shaped irregular cross-section copper strip of claim 5 or 6,
In the rolling device, the pressing force that presses the flat copper strip to be processed against the surface on which the V-shaped projections of the flat plate-shaped V-shaped die are formed is measured by the measuring device. An apparatus for manufacturing a stepped irregular cross-section copper strip, wherein feedback control is performed corresponding to a measured value of thickness. In the manufacturing apparatus of the step-shaped irregular cross-section copper strip of any one of Claims 5 to 7,
The measuring device is a substantially tire-shaped roll having a diameter of 20 mm or more, and the tire contour of the roll has a chamfered shape with a radius of curvature of 4 mm or more on the tire shoulder, or together with it, 0 mm or more to 2 mm or less. At least two rolls having a shape having a substantially linear tread surface are used, and the stepped irregular cross-section copper strip material to be measured for the thickness is sandwiched between the tread surfaces of the two rolls. The manufacturing apparatus of the step-shaped irregular cross-section copper strip characterized by measuring the said thickness based on the space | interval of the said rolls displaced by this.