JP2010005709A - Metal-foil roll-forming apparatus, metal-foil roll-forming method, and coiled metal foil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roll forming system which facilitates machining, can reduce machining cost, forms fine holes in metal foil at a prescribed pattern and an aperture ratio, and removes dust, machining waste, and fines resulting from an environment or a machining process itself during machining. <P>SOLUTION: The roll forming system performs continuous machining such as hole forming on the metal foil with a thickness of 50 μm or smaller by using a metallic forming roll with fine projections formed on its surface and elastic body receiving rolls each facing the forming roll with the metal foil interposed therebetween. In addition, the roll forming system brushes off machining waste and fines embedded in the elastic body of the first receiving roll immediately after machining by actions of a plurality of elastic fiber brush rolls rotating at high speed. Ahead of the forming roll in its rotation direction, a plurality of receiving rolls are disposed and a plurality of elastic fiber brush rolls are further disposed to cope with half-cutting and to remove machining waste, fines adhering to a foil surface, and dust. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a roll forming apparatus and a forming method for a metal foil used as a collector electrode foil used in batteries, capacitors and the like as electric energy for electric vehicles and home appliances in place of conventional fossil energy.

  Furthermore, the present invention is a metal foil used as a collector electrode foil used in a battery, a capacitor, etc., wherein a long metal foil wound in a coil shape is rewound and the long metal foil is received as a forming roll. The present invention relates to a flat and coiled metal foil in which foreign matters are removed by forming a large number of fine holes in a metal foil by being sandwiched between rolls, and then winding the long metal foil after the fine hole formation again.

  In recent years, with the rapid development of multimedia technology, the use of secondary batteries as an alternative energy on a global scale, including electric vehicles that are used in portable electronic devices and are changing at an accelerated pace here. There is a need for a smaller, lighter and higher performance without waiting.

  In lithium batteries, the development of electrode active materials has been energetically performed mainly for the purpose of improving energy density and reducing costs. Each of these positive and negative active materials is a positive electrode aluminum foil and a negative electrode that are current collectors. Has a problem in that the adhesion to the copper foil surface is poor and a local peeling phenomenon is likely to occur, and the hole communicating with the metal current collector in Patent Document 1 (Japanese Patent Publication No. 7-70327) is caused by this peeling phenomenon. The electrode performance is significantly reduced.

  Moreover, as a manufacturing method of perforated foil, conventionally, a method of forming a hole by pressing using a concavo-convex mold (punching metal) or a method in which a part of the material of the foil is melted by a chemical treatment such as etching is used. The method of forming is used.

  For example, in Patent Document 2 (Japanese Patent No. 3666558), a metal foil is sandwiched between a die having a punched hole and an elastic body and passed between rolls, whereby the elastic body is pressed to apply the metal foil. A method of forming a hole in a metal foil by deforming into a punching hole of a mold, wherein the mold and the elastic body are each formed of an annular body having a length sufficiently larger than the outer peripheral length of the roll. A method for producing a perforated foil for rotational movement is disclosed.

  Further, in Patent Document 3 (Japanese Patent Laid-Open No. 2001-79795), processing is easy, the processing cost can be reduced, burrs can be prevented from being generated or broken during processing, and a strong porous metal. This is a method of manufacturing a foil sheet, in which a metal foil sheet with a thickness of 50 μm or less is laminated with an ultraviolet curable adhesive, heat-peelable adhesive or water-soluble adhesive tape, and then punched into the ultraviolet curable adhesive tape and the metal foil sheet by punching. A method for forming a porous metal foil sheet comprising uniformly punching a large number of small holes having a rate of 25% or more, and then causing the adhesive tape to lose its adhesive force and peeling the adhesive tape from the metal foil sheet. It is disclosed.

  Furthermore, in patent document 4 (Unexamined-Japanese-Patent No. 2002-216775), the electrode of the secondary battery which can enlarge the aperture ratio of a collector foil and can form many small holes in a thin collector foil A current collector foil molding method and molding apparatus, wherein a non-porous current collector foil is passed over an elastic belt between an embossing roll having a large number of convex portions and a flat roll having no irregularities. And forming a through hole at the location of the current collector foil pressed by the convex portion and embedding a punched residue generated at the time of forming the through hole in the elastic belt. A method and apparatus for forming a foil that is removed from an elastic belt are disclosed.

  Further, in Patent Document 4 (Japanese Patent Application Laid-Open No. 2001-1007), a hole capable of efficiently producing a perforated foil having a high degree of freedom such as the size and pitch of the hole without incurring high costs. It is a manufacturing method of bright foil. When a metal foil is placed on an elastic body on a base plate and a grooved roll is pushed into the elastic body, the elastic body is deformed and the metal foil is pushed into the groove of the roll. The metal foil is sheared by the edge of the groove and the elastic body, and the portion of the metal foil pressed against the elastic body by the protrusion of the roll becomes a punched residue, and a perforated foil in which holes are formed is obtained. A method is disclosed. Similarly, in Patent Document 5 (Japanese Patent Application Laid-Open No. 2002-113535), there is a method for producing a perforated foil that does not cause cracks in the peripheral ribs of the formed quadrangular holes, and one of the roll devices. In the rhombus convex portion formed on the surface of the processing roll constituting the roll of the other, the opposing vertex of one set of the two opposing vertices is arranged along the roll rotation direction, and the other set is opposed. A system is disclosed in which vertices are arranged along the roll axis direction and the interval between one set of vertices is set longer than the interval between the other set of vertices.

Japanese Patent Publication No. 7-70327 Japanese Patent No. 3666558 JP 2001-79795 A JP 2002-216775 A JP 2002-113535 A

  In the conventional roll forming method, since the receiving roll is an elastic body as compared with the forming roll which is a mold as described above, the shape after the hole processing is burred in the direction in which the processing blade comes off. It was certain that the foil thickness after processing was thick, and there was a possibility of defective dimensions including processing waste.

  The conventional hole forming in roll forming is performed by a pair of a mold roll and a rubber receiving roll. Here, the dimensional variation between the receiving roll and the mold of the forming roll body, and further, the rubber material / hardness and the rubber Due to the variation in density, incomplete machining such as half cut is unavoidable.

  In drilling with the conventional roll forming method, the scraps adhere to the elastic roll surface, which is the receiving roll, due to the construction method, and it is not sufficient to eliminate it with a resin brush and air pressure / suction. There is a situation that cannot be removed during one rotation of the roll. When the next processing is started in such a state, the processing waste adhering to the surface of the receiving roll cannot be excluded, and depending on the attachment position, is sandwiched between fine burrs of “burrs”. More and more, making it difficult to eliminate. In the prior art, it is impossible to completely eliminate the state of these difficult-to-exclude machining scraps.

  In addition, because the receiving roll is an elastic body with a roll-shaped mold having a convex shape, burr-like burrs always occur, and the metal foil thickness after processing becomes thicker than the original foil, so that customer specifications cannot be satisfied Also occurs. In addition, when drilling in roll forming, the metal fine powder floats around and adheres to the foil surface, in addition to relatively large scraps (0.5φ).

  In the above-mentioned conventional technology, although improvement proposals are made for burrs, it is possible to eliminate processing waste, fine powder, and dust that cause a short-circuit phenomenon that becomes a fatal defect of the electrode foil as a product such as a secondary battery. Is hardly touched. However, due to the failure and recovery cases of several major battery manufacturers in recent years, the quality of the electrode foil, along with burrs, has become the most important issue in the future to eliminate processing waste, fine powder, and dust released on the electrode foil. Yes.

  A roll forming system that forms a fine convex shape on the surface of a current metal roll and consists of a receiving roll made of an elastic body facing the metal foil, and performs continuous processing such as drilling on a long metal foil. For example, in the case of punching a foil, the processing part is only a pair of rolls such as a metal roll and rubber, and the processing opportunity is once. Therefore, due to various conditions such as the accuracy of each roll or roll assembly, density variation of rubber rollers, etc., vibration during processing of the machine, etc., the positional relationship between the metal foil and the mold varies and the half-cut punching process is not completed. There is a problem that a state in which a part of the chips is connected to a metal foil as a base material without being removed in the state.

  In addition, it is unavoidable in the past, and scraps stuck to the rubber receiving roll as a concave shape randomly adhere to it, and when the hole is drilled, the scraps are pinched, leaving the anxiety of falling. It will be rolled up as it is.

  The above-mentioned two kinds of scraps cannot be eliminated by the conventional processing / gradual scrap method. In addition to these scraps, in actual processing, it is possible to temporarily cope with fine cuttings that adhere to the base material and rotate the base material surface with an ordinary commercially available adhesive roller. In continuous molding, roll cleaning cannot be performed, and a stable dust removal function cannot be maintained.

  The electrode foil according to the present invention is assembled and packaged in a stacked or wound manner. At that time, the inclusion of metal debris causes the foreign matter to grow by an electric / chemical reaction and penetrate the spacer, causing a failure such as a short circuit. It becomes a fatal defect. In order to be a material for electronic components, it is an important quality factor to prevent foreign matter and dust from adhering to and entraining other than necessary materials. Therefore, the present invention plays an important role in maintaining the quality of the electrodes of these electronic components by means of suppressing and eliminating the generation of processing waste in the formation of electrode foils.

  The metal foil roll forming apparatus of the present invention rewinds a long metal foil wound in a coil shape, and sandwiches the long metal foil between a forming roll and a receiving roll to form a large number of fine holes in the metal foil. A metal foil roll forming device for forming and winding the long metal foil after the micro-hole forming into a coil shape again. The forming roll has many fine convex molds formed on the roll surface, and the receiving roll is A roll made of an elastic body pressed against the forming roll, and a plurality of receiving rolls are provided along the flow of the metal foil.

  Furthermore, the metal foil roll forming apparatus of the present invention is provided with a scraping brush having elastic fibers on the surface in order to scrape processing scraps on the downstream side in the rotational direction from the opposing pressure contact portion with the forming roll of the receiving roll. It is characterized by that.

  Furthermore, the metal foil roll forming apparatus of the present invention is characterized in that a rotating brush having elastic fibers is provided on the downstream side along the flow of the metal foil further than the plurality of receiving rolls against the forming roll. And

  Furthermore, the metal foil roll forming apparatus of the present invention is such that the long metal foil that has been rewound is a forming roll at the opposing pressure contact position between the first receiving roll and the forming roll provided on the upstream side along the flow of the metal foil. The position where the second metal receiving roll and the forming roll which are provided downstream of the first receiving roll along the flow of the metal foil is in contact with the forming roll is in contact with the forming roll. In the vicinity of the intermediate position of the region, the position where the rotating brush is opposed to the forming roll is in the vicinity of the position where the long metal foil after micro-hole forming starts to separate from the forming roll.

  Furthermore, the metal foil roll forming apparatus of the present invention is a burr-like processing return generated by processing of the metal foil in the middle of the metal foil transfer line before the long metal foil after the microhole forming is wound into a coil shape again. In order to finish the sheet by rolling it to near the foil thickness, a rolling roll that rotates in opposition is provided.

  Furthermore, the metal foil roll forming apparatus of the present invention is provided with a substantially sealed space part in the middle of the metal foil transfer line before the long metal foil after microhole forming is wound up in a coil shape, and is transferred therein. It is characterized in that foreign matters such as processing waste, fine powder, and dust accompanying the metal foil are removed by spraying or sucking compressed gas on the metal foil.

  Furthermore, in the metal foil roll forming method of the present invention, a long metal foil wound in a coil shape is rewound, and the long metal foil is sandwiched between a forming roll and a receiving roll so that a large number of fine metal foils are sandwiched between the metal foil. A metal foil roll forming method for forming a hole and winding the long metal foil after forming the microhole into a coil again, wherein the forming roll has a large number of fine convex molds formed on the surface of the roll. The roll is a roll made of an elastic body pressed against the forming roll, and the receiving roll is a first receiving roll and a second receiving roll, which are provided along the flow of the metal foil and have substantially the same function and performance. The metal foil is constituted by a roll, and even if half cut of the metal foil hole occurs in the first receiving roll, the metal foil is formed by the subsequent second receiving roll.

  Furthermore, the metal foil roll forming method of the present invention was generated by processing the metal foil by a rolling roll provided in the middle of the metal foil transfer line before the long metal foil after microhole forming was wound into a coil shape again. It is characterized by rolling a burr-like work return to near the foil thickness and finishing.

  Furthermore, in the metal foil roll forming method of the present invention, a substantially sealed space is provided in the middle of the metal foil transfer line before the long metal foil after microhole forming is wound up in a coil shape, and transferred therein. It is characterized in that foreign matters such as processing waste, fine powder, and dust accompanying the metal foil are removed by spraying or sucking compressed gas on the metal foil.

  Furthermore, the coiled metal foil of the present invention is a rewound long metal foil wound in a coil shape, and the long metal foil is sandwiched between a forming roll and a receiving roll, and a large number of fine holes are formed in the metal foil. A coil-shaped metal foil obtained by rewinding the long metal foil after forming the fine holes, wherein the forming roll has a number of fine convex shapes formed on the roll surface, and the receiving roll is a forming roll. The receiving roll is constituted by a first receiving roll and a second receiving roll having substantially the same function and performance provided along the flow of the metal foil. Even if half cut of the metal foil hole occurs in the first receiving roll, the metal foil is molded by the subsequent second receiving roll, and the long metal foil after forming the fine hole Before being coiled again The rolling roll provided in the middle of the metal foil transfer line is rolled to finish the burr-like processing return generated by processing the metal foil to near the foil thickness, and further, a substantially sealed space is provided, The coil with flat and foreign matter removed after removing the foreign matter such as processing waste, fine powder, and dust accompanying the metal foil by blowing or sucking compressed gas on the transfer metal foil. It is a metal foil.

  The current demand for the current collector metal foil for electronic parts such as secondary batteries and capacitors is to be continuously produced in large quantities at a low cost. To that end, other technologies such as "lass processing" have been established. . According to the present invention, as is clear from the above detailed description, a roll-shaped long current collector is automatically and continuously drilled at a high speed, and a fatal failure of an electronic device using an electrode foil is prevented. A metal foil roll forming apparatus and a metal foil roll forming method that can reliably provide a low-cost current collector foil that is free of processing waste and metal fine powder, which can be prevented and is the most important factor affecting quality of maintaining characteristics It is a suggestion. In addition, the present invention proposes a coiled metal foil as a low-cost current collector foil without processing scraps and fine metal powder.

  In particular, metal scraps and fine powders in electrode foils in lithium secondary batteries, etc., are the cause of major obstacles that will grow internally and become social problems due to aging. The industrial value is remarkable from the trend of the equipment market.

  The present invention has been made in view of the problems of such conventional techniques, and the object of the present invention is to provide a current collector for an electrode that is free from residual or attached residues such as chips and dust continuously and in large quantities. It can be manufactured and can realize a significant cost reduction compared to other conventional methods. That is, the present invention is a proposal of an apparatus and method that eliminates the pinching of scraps between half-cuts and punching burrs that are unavoidable than the method using a metal roll mold and a rubber receiving roll.

  First, the cause of the half-cut (incompletely removed state) is that, conventionally, the metal foil is perforated in a molding process by one sandwiching operation between the roll mold and the receiving roll. In the present invention, a metal foil pass line is secured in a state of keeping contact with the periphery of the roll mold, and the convex mold of the roll mold is formed even after the molding process with the first receiving roll. It is in a state where it is still in the through-molding hole of the metal foil, and a plurality of rolls are made by performing a punching operation by pressure contact with the roll mold again by the receiving roll arranged next in this state. The processing state with the blade is allowed to elapse, and the incomplete punching state / half-cutting is made into a complete punching state. In this method, by increasing the number of receiving rolls, it is possible to increase the number of molding steps and obtain a more complete drawing state. In the present specification, an embodiment provided with three or more receiving rolls is not particularly described, but this can be easily implemented by those skilled in the art by applying the idea of the present invention. .

  Next, a description will be given of countermeasures against “missing burrs” that occur extremely rarely due to “residual scraps” on the receiving roll. This is “scraps” in a state where “residual scraps” are sandwiched as “scraps” in the holes after molding. With regard to this “cutting burrs”, a rotating brush with resin elastic fibers planted on the surface is placed opposite to the molding roll mold, and the fine mold of the molding roll is still in the through hole of the metal foil. In the state, the processing scraps accompanying the metal foil are eliminated by rotating the glass foil at a high speed of about 1000 rpm facing the metal foil.

  The rotating brush is rotated at a high speed by using a solid cam (groove cam) or a biaxial motor drive. Thus, by simultaneously moving and swinging in the axial direction at the same time, a force to eliminate the stuck scraps in all directions acts, and it can be expected that the function of removing the scraps will be enhanced. Such an exclusion function increases the number of times of contact of the rotating brush with the metal foil surface (specifically, the number of rotations or the number of oscillating resin brushes), thereby improving the accuracy of removing the target scraps. Is obvious.

  Moreover, this invention is comprised so that dust may be removed by pressurization and attraction | suction in the container close | similar to airtight considering dust collection efficiency in the middle of the transfer line after the process of metal foil. At that time, by installing a rectangular brush in a plane on the part where the metal foil of the container passes, contact it continuously when moving the metal foil, and remove dust etc. Easy to suck. Processing dust, dust, etc. removed by circulating a suction air fluid having a predetermined pressure in the container are collected by a dust collector.

  In the present invention, with respect to fine dust other than relatively large waste generated by processing such as scraps, a dust removing roller having a commercially available dry cleaning function at a position immediately before winding of the metal foil after processing. It is useful to place By increasing the number of times of dust removal by the dust removal roller (the number of dust removal rollers arranged), the accuracy of removing the target fine dust is improved.

  In the present invention, it is possible to finish the burr-like burrs generated by processing to a thickness close to the foil thickness by a rolling function that is sandwiched between a pair of flat metal rolls.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The metal foil roll forming apparatus of the present invention is a device for geometrically squeezing and arranging a large number of fine holes in a metal foil as a current collector for an electrode of an electronic component such as a secondary battery. A metal forming roll 10 in which a large number of fine protrusions 11 (300 to 600 μmφ) formed geometrically are arranged at equal intervals, and a rubber receiving roll 30 that rotates in synchronization therewith. Fine holes are made in the metal foil 20 such as aluminum or copper. At this time, the rubber receiving roll 30 is pressed and rolled against the metal forming roll 10 with a predetermined pressing force.

  As a result, fine holes are formed in the metal foil 20, and at this time, scraps 21 having a thickness of 300 to 600 μmφ and a thickness of 10 to 100 μm are generated. Most of the scraps 21 are separated from the metal foil 20 along with the rubber roll that is the receiving roll 30, but the scraps 21 that are partly accompanied by the metal foil 20 are arranged on the downstream side of the receiving roll 30. The brush roll 50 is scraped off. In this way, the scraps 21 and the fine metal powder are separated by the rubber roll as the roll 30, and the scraps 21 and the like that cannot be separated are separated from the biaxial motor drive mechanism 501 and the like on the circumference of the forming roll 10. It can be scraped off by being additionally arranged. The two-axis motor drive mechanism 501 has a punching action that is caught in a hole after processing by a rotating operation by a high-speed rotating motor 502 and a high-speed moving / swinging operation of the forming roll 10 in the axial direction by a rotating motor 503 and a cam 504. It can be expected that a force to exclude the scrap 21 in all directions acts and the function of removing the processed scrap 21 is enhanced. Further, in order to eliminate dust and the like attached to the fine protrusions 11 of the forming roll 10, the brush roll 56 is provided on the upstream side in the rotational direction from the introduction portion of the metal foil 20 of the forming roll 10, thereby Dust can be directly scraped off from the fine protrusions 11.

  Furthermore, the metal foil roll forming device of the present invention is a metal piece entirely by a pressure / suction container with a brush and a dust removal roll with a dry cleaning function in the middle of the movement of the foil to the winding part of the metal foil after forming, A coil-shaped metal foil is obtained by winding as a current collector having fine pores of a regular array over a wide range without metal powder or the like.

  Furthermore, the metal foil roll forming apparatus of this invention is demonstrated along an accompanying drawing. The metal foil roll forming apparatus as the first embodiment is shown in detail in FIG. 1 in which a forming process part is formed by the forming roll 10 and the receiving roll 30, and FIG. 3 shows the overall apparatus configuration.

  The first and second receiving rolls 30 and 40 are pressed and rotated with respect to the forming roll 10 having an outer diameter of 100 mmφ with the metal foil 20 to be processed interposed therebetween. The first and second receiving rolls 30 and 40 roll while being pressed against the forming roll 10 with a predetermined pressure. Around the forming roll 10, a brush roll 50 having a wire length of 16 mm and a resin wire having an outer diameter of 80 mmφ and 0.25 φmm is disposed on the downstream side of the flow of the metal foil 20. The brush roll 50 is rotated by a high-speed rotating motor 52 so as to face the moving direction of the metal foil 20 to be processed (the direction opposite to the rotating direction of the forming roll 10), and the scraps 21 accompanying the metal foil 20 are made of metal. Exclude from foil 20.

  The forming process of the metal foil 20 to be processed is performed such that the metal foil 20 to be processed having a width of 260 mm is rewound from the feed roller 25 and transferred in the direction of the arrow, and is sandwiched between the forming roll 10 and the receiving roll 30. By being sandwiched in the vicinity and pressed with a pressure of 8 (15 Mpa), the fine convex cutting edge mold 11 on the forming roll 10 comes into contact with the surface of the metal foil 20, and the elasticity of the rubber of the receiving roll 30 is increased. Micro-hole drilling is performed by the resistance within the elastic limit surpassing the breaking force of the metal foil 20 to be processed. Immediately after, the resistance disappears instantaneously, and the rubber that has deformed the receiving roll 30 due to elasticity is the original shape. Return to.

The pressure between the mold 11 and the receiving roll 30 of the forming roll 10 varies slightly depending on the thickness and width of the foil material 20 to be processed, the arrangement of the geometric holes, etc. Table 1 is shown as an example.

  The metal foil 20 to be processed remains in a state in which the fine mold 11 remains pressed and perforated with respect to the forming roll 10 even after the forming process. The convex fine cutting edge 11 having a diameter of 5 mm and a height of 0.3 mm is inserted and transferred to the vicinity of the separation position C. Thereafter, the direction-changing roller 66 having a diameter of 30 mm is arranged to direct the direction toward the most downstream winding roller 26. Thereby, as for the metal foil 20, the state of pressurization and hole processing is continued with respect to the forming roll 10 in the region from the sandwiching position A to immediately before the separation position C.

  In the region of the pressurization / hole processing state from the sandwiching position A of the metal foil 20 to immediately before the separation position C, the metal foil 20 to be processed is subjected to the pressurization of 15 MPa after the forming process by the receiving roll 30 is finished. It passes between the forming roll 10 and the second receiving roll 40. At that time, the pressing force is applied again to the metal foil 20 to be processed, and the same micro-hole processing as in the first processing is performed, so that the half-cut (incomplete punching) portion is made a through-hole state. be able to.

  The installation range of the first receiving roll 30 and the second receiving roll 40 provided facing the forming roll 10 is within a forming region (180 ° to 270 °) from the vicinity of the sandwiching position A to the vicinity of the separation position C. Thus, it can be set as appropriate within a range of about 90 ° to 180 ° from the vicinity of the sandwiching position A to the vicinity of the second forming position B. In the present invention, as described above, the third and subsequent receiving rolls (not shown) can be installed on the downstream side along the circumference of the forming roll 10. For this purpose, it is necessary to take a wide molding region from the vicinity of the sandwiching position A to the vicinity of the separation position C. By doing this, or by increasing the outer diameter of the forming roll 10 as much as possible, the arrangement position and quantity of the receiving rolls increase, and the purpose of eliminating the half-cut (incomplete punching) as much as possible is achieved. Correspondence becomes possible.

  In the embodiment shown in FIG. 2, a first brush roll 50, a second brush roll 55, and a third brush roll 56 are provided further downstream of the first receiving roll 30 and the second receiving roll 40. Is.

  The brush roll 50 and the scraping roll 90 applied to the metal foil roll forming apparatus of the present invention have substantially the same structure. The brush roll 50 and the brush-off brush roll 90 are resin-made conductive and elastic brushes, and are sandwiched and fixed between “burrs” of a burr-like minute height in hole processing, which are difficult to eliminate. It has a hardness and a density that are effective in eliminating the residual debris 21. The dimensions of these brush rolls 50 and 90 may be set arbitrarily depending on the relationship with the installation space. However, it is necessary to have hardness and a density that are effective for removing the scrap 21 remaining in the processing hole. The material of the brush rolls 50 and 90 of this embodiment is mainly carbon fiber, and nylon fiber can be used in combination as required. The rotation direction of the brush rolls 50 and 90 of the present embodiment is the direction opposite to the direction of rotation of the metal foil 20 to be processed, the rotation speed is around 800 rpm, and the roll mold rotation speed is 8 to 10 rpm. It is. Further, in order to eliminate dust and the like attached to the fine protrusions 11 of the forming roll 10, the brush roll 56 is provided on the upstream side in the rotational direction from the introduction portion of the metal foil 20 of the forming roll 10, thereby Dust can be directly scraped off from the fine protrusions 11.

  In the metal foil roll forming method of the present invention, the convex cutting blade mold 11 on the surface of the forming roll 10 is synchronized with the moving direction and moving speed of the metal foil 20 in order to perform processing in the trajectory of the forming roll 10 rotating. Then, the metal foil 20 approaches while moving in the rotation direction of the forming roll 10. The metal foil 20 to be processed is sandwiched in the vicinity of the sandwiching position A by the convex cutting die 11 on the surface of the forming roll 10 and the receiving roll 30. The rubber on the surface of the receiving roll 30 starts to be deformed by the pressing force from the convex cutting edge mold 11 on the surface of the forming roll 10 and starts to cut the sandwiched metal foil 20. As the rotation of the forming roll 10 proceeds, the penetration of the convex cutting edge mold 11 on the surface of the forming roll 10 into the rubber on the surface of the receiving roll 30 proceeds, and as the convex cutting edge mold 11 approaches the end of its deformation, The scrap 21 is cut from the workpiece metal foil 20, and the scrap 21 is left in the rubber on the surface of the receiving roll 30 and separated from the metal foil 20.

  However, since the surface rubber pressure of the receiving roll 30 that is a cutting reaction force with respect to the convex cutting edge mold 11 is unstable, incomplete machining is likely to occur. Therefore, in the metal foil roll forming method of the present invention, a wide forming region from the vicinity of the sandwiching position A to the vicinity of the separation position C is taken on the circumference of the forming roll 10, and the metal foil 20 is placed on the forming roll 10 in that region. In the meantime, the plurality of receiving rolls 30 and 40 allow the metal foil 20 to reliably contact at the maximum rubber deformation position (maximum reaction force position) on the receiving roll surface, thereby enabling reliable processing.

  Furthermore, in the present invention, incomplete machining, which is expected to occur due to the above-described instability of the reaction force when only the plurality of receiving rolls 30 and 40 are rotated, that is, half-cut or burr-like “burr” “burr”. Since it may be difficult to remove the scraps 21 sandwiched and fixed between them, countermeasures are also taken. That is, as shown in FIG. 3, a two-axis drive mechanism is employed in which the rotating brush roll 50 is oscillated at a stroke length of 2 mm and 100 spm in the axial direction.

  In the metal foil roll forming apparatus of the present invention, the outer diameter of the forming roll 10 is increased so that a plurality of brush rolls 51, 52, 53, 54 can be installed along the circumference of the forming roll 10, By selecting as much as possible within the range allowed by various conditions such as installation space and roll mold production, it is possible to increase the number of brush rolls that rotate and swing. As a result, it is possible to eliminate the difficult-to-remove residual scrap 21 that is sandwiched and fixed between “burrs” having a small burr shape after molding. Further, in order to eliminate dust and the like attached to the fine protrusions 11 of the forming roll 10, the brush roll 56 is provided on the upstream side in the rotational direction from the introduction portion of the metal foil 20 of the forming roll 10, thereby Dust can be directly scraped off from the fine protrusions 11.

  In the metal foil roll forming method of the present invention, the removal operation of the residual scrap 21 and the like that are sandwiched and fixed between “burrs” having a minute burr shape after forming is achieved. This removal operation is performed in an atmosphere in which air with a static pressure of 2.5 Kpa is sucked in the enclosed space. Although not shown in detail in these configurations, each brush roll 50 is covered by covering a molding processing region from the vicinity of the sandwiching position A to the vicinity of the separation position C with a space enclosed and sucking air in the space. The extracted dust and fine powder soared in the space surrounded by etc. are securely stored by a dust collector (not shown).

  Furthermore, the metal foil roll-forming apparatus of the present invention will be described with reference to FIG. In this entire process, in the roll forming process of the metal foil 20 or the like of the reel-shaped material including the contents described in the above embodiments, the processing waste and dust do not remain on the reel-shaped metal foil 26 wound as a product. A metal foil roll forming apparatus and a metal foil roll forming method are proposed.

  Since all the processes of the metal foil roll forming apparatus shown in FIG. 5 have the same configuration, the “forming roll unit” 10, 30, 40 and the “scrap removal unit” 50 described above will not be described in detail. In the metal foil roll forming apparatus of FIG. 5, the long metal foil 20 is fed out from the reel-shaped metal foil 25 in the direction of the arrow, and is sandwiched between the forming roll 10 and the first receiving roll 30 by the introduction roll 31. Micropores are formed by the convex cutting edge mold 11 on the surface of the forming roll 10. The scraps 21 are captured in the rubber on the surface of the first receiving roll 30, and are separated from the metal foil 20 after forming the micro holes by the rotation of the first receiving roll 30. The scraps 21 adhering to the rubber on the surface of the first receiving roll 30 are wiped off by the brush-off brush rolls 39, 39 provided downstream. Even after the first forming operation between the forming roll 10 and the first receiving roll 30, the metal foil 20 is rotated and transferred while being wound around the forming roll 10. The molding processing operation is received. Here, incompletely processed parts that are not completely removed by the first molding process operation, that is, half cuts, scraps 21 and the like that are sandwiched and fixed between “burrs” having a minute height of burrs, etc. The second molding process is completely processed. Also in the second molding operation region, the scrap 21 extracted from the metal foil 20 adheres to the rubber on the surface of the second receiving roll 40 and is wiped off by the brushing brush roll 49 provided downstream.

  Also by the above, the scraps 21 and dust accompanying the metal foil 20 after the forming process are removed by the scrap removing unit 50. The metal foil 20 from which the scraps 21, dusts, and the like have been removed is changed in direction by the outlet roll 60 after exiting the forming process region, and after the change of direction, the “fogging” generated in the metal foil 20 by the punching process at the horizontal movement position. Is rolled by a rolling unit 80 to bring the foil thickness to a level close to the original foil thickness before roll forming.

  As shown in FIG. 6, the rolling unit 80 is provided with a pair of 80 mmφ metal rolls 81 and 82 on the upper and lower sides, 120 mmφ reinforcing rollers 83 and 84 as backups, and guide rolls 85 and 86 on both sides thereof. It is arranged. The guide rolls 85 and 86 arranged on both sides are commonly called “zebra rolls” and have a function of spreading the metal foil 20 in the width direction. In addition, about pressurization, the thickness after pressurization is managed by giving a roll structure sufficient intensity | strength and controlling the clearance gap between rolls. Further, the lower roll 82 of 80 mmφ is rotated in synchronization with the winding speed of the metal foil 20 by a motor (not shown) to feed the foil. When deformation of the upper and lower rolls 81 and 82 cannot be ignored due to conditions such as the thickness of the metal foil 20 to be processed, it is effective to install the reinforcing rolls 83 and 84.

The metal foil roll forming apparatus shown in FIG. 5 is equipped with an air dust removal unit 90 and a cleaning function for the purpose of eliminating punching fine powder that accompanies the metal foil 20 just before the “rolling” of the finished foil. A dust removing roller unit 100 is provided. As shown in FIGS. 7A, 7B, and 7C, the air dust removing unit 90 is ideally formed with air ejection holes 121, 121, 121, 121, 121, 121, 121, 121, 121, 121, Is a unit in which the metal foil 20 after micro-hole processing moves between a plate 124 having 121... And a plate 125 having air suction holes 122, 122, 122. is there. In addition, a soft brush 123 surrounded by a rectangle is disposed at a position where the metal foil 20 moves on the plate so as to come into contact with the foil surface, and has a function of peeling the fine powder from the surface of the metal foil 20. The fine powder is exfoliated and fluttered up so that air can be collected. The jet air pressure is ² to 3 kg / cm ² , and the suction is 2.5 Kpa at the dust collector static pressure. The required number of air passage holes for dust removal are installed in the upper and lower plates having an area of width 100 × length 300 as long diagonal holes having a width of 1 mm.

  As described above, according to the forming apparatus and forming method of a perforated metal foil that excludes processing waste, fine powder, and dust according to the present invention, a metal mold hole is formed by pressing a simple mold against an elastic body. Because it is a roll molding method, it is a continuous processing method, and the trend for current collector electrodes using the metal foil in the future is “micro-hole processing into thin foil”. In contrast, it is possible to provide the market with ideal metal foil that is stable and highly productive, does not contain processing waste, fine powder, and dust, and that has reduced thickness of processing burrs etc. become.

  Accordingly, the present invention allows a metal foil having a thickness of 50 μm or less to be elongated with a metal forming roll having a fine convex shape formed on the surface thereof and a receiving roll made of an elastic body facing the metal foil. It is a roll forming system that performs continuous processing such as drilling on metal foil. At the same time, one or more processing scraps and fine powders embedded in the elastic body of the first receiving roll immediately after processing are operated by a plurality of elastic fiber brush rolls rotating at high speed and in the direction of rotation of the forming roll. The second and third receiving rolls (having the same function and performance as the first receiving roll) are disposed, and the metal foil is fitted on the convex portion of the forming roll and is mechanically stable. While being transferred, the processing waste and the like are removed by the high-speed rotation operation of the plurality of elastic fiber brush rolls. Furthermore, just before winding up the metal foil, an adhesive rubber roll that has its own cleaning function is arranged to provide a roll forming system that can handle half cuts and eliminate processing dust, foil surface adhering fine powder, and dust. is there. As a result, processing waste, foil surface adhering fine powder, and dust that are unavoidable due to vibrations in processing equipment in the apparatus, accumulation of assembly tolerances, and the like are to be eliminated.

The arrangement | positioning figure which shows the forming roll unit of the metal foil roll forming apparatus of this invention, and a waste removal unit. The arrangement | positioning figure which shows the forming roll unit in another Example of the metal foil roll forming apparatus of this invention, and a waste removal unit. The perspective view which shows the drive mechanism of a waste removal unit. The arrangement | positioning figure which shows the forming roll unit in another Example of the metal foil roll shaping | molding apparatus of this invention, and a waste removal unit. BRIEF DESCRIPTION OF THE DRAWINGS The whole block diagram of the metal foil roll forming apparatus of this invention. Detailed view of the rolling mechanism of the perforated metal foil. A, B, C Detailed view of the dust removing device of the metal foil roll forming device of the present invention. A and B Explanatory drawing of shaping | molding process operation | movement of the metal foil roll shaping | molding method of this invention.

Explanation of symbols

10 forming rolls, 11 convex cutting edge mold,
20 metal foil (working foil), 21 convex cutting edge type,
30 first receiving roll, 39 brush-off brush roll,
40 second receiving roll, 49 brush-off brush roll,
50 brush rolls,
80 Rolling unit, 90 Rolling unit, 100 Dust removal roller unit

Claims (10)

  A long metal foil wound in a coil shape is rewound, and the long metal foil is sandwiched between a forming roll and a receiving roll to form a large number of fine holes in the metal foil. This is a metal foil roll forming device for winding a metal foil again into a coil shape, wherein the forming roll has a large number of fine convex shapes formed on the surface of the roll, and the receiving roll is pressed against the forming roll. A metal foil roll forming apparatus, characterized in that a plurality of the receiving rolls are provided along the flow of the metal foil.   The scraping brush which has the elastic fiber on the surface in order to scrape a processing waste in the downstream in the rotation direction rather than the opposing pressure-contact part with the said forming roll of the said receiving roll was provided, The surface of Claim 1 characterized by the above-mentioned. Metal foil roll forming equipment.   3. A rotating brush having elastic fibers is provided on the downstream side along the flow of the metal foil more than the plurality of receiving rolls against the forming roll. The metal foil roll forming apparatus as described.   The opposing pressure contact position between the first receiving roll and the forming roll provided on the upstream side along the flow of the metal foil is in the vicinity of the position where the unwound long metal foil starts to contact the forming roll, The opposing pressure-contact position between the second receiving roll provided on the downstream side along the flow of the metal foil from the first receiving roll and the forming roll is in a region where the long metal foil is in contact with the forming roll. 4. The installation position of the rotating brush that is in the vicinity of the intermediate position and that opposes the forming roll is in the vicinity of a position where the long metal foil after forming the fine holes starts to separate from the forming roll. Metal foil roll forming equipment.   In the middle of the metal foil transfer line before the long metal foil after forming the microholes is coiled again, the burr-like processing return generated by the processing of the metal foil is rolled to near the foil thickness and finished. Therefore, a metal roll forming apparatus according to one of the preceding claims, wherein a rolling roll that rotates in opposition is provided.   A substantially sealed space is provided in the middle of the metal foil transfer line before the long metal foil after the micro-hole forming is wound into a coil again, and compressed gas is blown or sucked into the transferred metal foil therein. The metal foil roll forming apparatus according to claim 1, wherein foreign substances such as processing waste, fine powder, and dust accompanying the metal foil are removed.   A long metal foil wound in a coil shape is rewound, and the long metal foil is sandwiched between a forming roll and a receiving roll to form a large number of fine holes in the metal foil. A metal foil roll forming method in which a metal foil is wound again into a coil shape, wherein the forming roll has a large number of fine convex shapes formed on the surface of the roll, and the receiving roll is pressed against the forming roll. A roll made of an elastic body, and the receiving roll is constituted by a first receiving roll and a second receiving roll having substantially the same function and performance provided along the flow of the metal foil, A metal foil roll forming method characterized in that, even when a half cut of a metal foil hole occurs in the first receiving roll, the metal foil is formed by a subsequent second receiving roll.   By the rolling roll provided in the middle of the metal foil transfer line before the long metal foil after the microhole forming is wound into a coil shape again, the burr-like processing return generated by the processing of the metal foil is reduced to near the foil thickness. The metal foil roll forming method according to claim 7, wherein the metal foil roll is finished by rolling.   A substantially sealed space is provided in the middle of the metal foil transfer line before the long metal foil after the micro-hole forming is wound into a coil again, and compressed gas is blown or sucked into the transferred metal foil therein. The metal foil roll forming method according to claim 7 or 8, wherein foreign matters such as processing waste, fine powder, and dust accompanying the metal foil are removed.   A long metal foil wound in a coil shape is rewound, and the long metal foil is sandwiched between a forming roll and a receiving roll to form a large number of fine holes in the metal foil. Coiled metal foil obtained by rewinding the scale metal foil, wherein the forming roll has a large number of fine convex shapes formed on the roll surface, and the receiving roll is elastically pressed against the forming roll. A roll comprising a body, and the receiving roll is constituted by a first receiving roll and a second receiving roll having substantially the same function and performance provided along the flow of the metal foil. Even if half cut of the metal foil hole occurs in the receiving roll, the metal foil is formed by the subsequent second receiving roll, and the long metal foil after the fine hole forming is wound into a coil shape again. Metal foil transfer la The burr-like processing return generated by the processing of the metal foil is rolled and finished to near the foil thickness by a rolling roll provided in the middle, and further, a substantially sealed space is provided and transferred therein. Coiled metal from which flat foreign matter has been removed after being wound up again after removing foreign matter such as processing waste, fine powder, and dust accompanying the metal foil by blowing or sucking compressed gas to the metal foil Foil.

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