JP5201376B1 - Method for producing lead alloy sheet for expanded lattice and method for producing expanded lattice for lead-acid battery using the lead alloy sheet - Google Patents

Abstract

A lead alloy sheet having a different alloy composition is overlapped on a base material sheet made of a lead alloy, and both are passed through a gap between a pair of rolling rolls and rolled a plurality of times. When manufacturing a lead alloy sheet for an expanded lattice in which the alloy sheet is integrated, a plurality of through holes penetrating the lead alloy foil in the thickness direction are scattered in the tip end region set near the tip of the lead alloy foil. In addition, the base material sheet and the lead alloy foil are supplied between the rolling rolls that perform the first rolling in a state where the tip end region of the lead alloy foil interspersed with the through holes is overlapped with the tip end portion of the base material sheet. . This makes it possible to reliably integrate the base material sheet and the lead alloy foil without particularly increasing the rolling rate in the first rolling.
[Selection] Figure 1

Description

  The present invention relates to a method for producing a lead alloy sheet used as a material for an expanded lattice for a lead-acid battery electrode plate, and a method for producing an expanded lattice using a lead alloy sheet produced by the production method.

  As an electrode plate for a lead-acid battery, a current collector made of an expanded grid and filled with an active material paste is widely used. The expanded lattice is manufactured by subjecting a lead alloy sheet to an expanding process. Expanded grids used as current collectors for lead-acid battery plates are required to have high adhesion to the active material paste (the property of being bonded to the active material paste) in order to retain the active material without dropping off. The Therefore, when the expanded lattice is formed of a lead alloy having relatively low adhesion to the active material paste, it is preferable to provide a thin layer made of a lead alloy having high adhesion to the active material paste on the surface. . As a material for obtaining an expanded lattice having such a structure, a thin layer of a lead alloy having an alloy composition different from that of the base material sheet is integrated on the surface of the lead alloy base material sheet constituting the main body of the expanded lattice. A composite lead alloy sheet having the above structure is used.

  An expanded lattice in which a thin layer with high adhesiveness to the active material paste is integrated on the surface is a cooling layer of a base material sheet made of a lead alloy and a lead alloy foil having an alloy composition different from that of the base material sheet. The lead alloy sheet having a composite structure in which the lead alloy foil is integrated on the surface of the base material sheet is manufactured by rolling between the base material sheets, and then the lead alloy sheet is expanded. In the expanding process, in the strip-shaped lead alloy sheet, after forming a large number of slits long in the longitudinal direction of the sheet in a zigzag shape, each portion of the lead alloy sheet in which the slits are formed is expanded in the width direction. Widen the slits into a mesh.

  When manufacturing a composite lead alloy sheet by cold rolling the laminate of the base material sheet and the lead alloy foil, devise to ensure the integration of the base material sheet and the lead alloy foil. There is a need. Rolling of the laminate of the base material sheet and the lead alloy foil is performed by gradually reducing the thickness of the laminate using a multi-stage rolling mill, but the base material sheet and the lead alloy foil are integrated. In order to perform reliably, it is important to reliably integrate the base material sheet and the lead alloy foil when the first rolling process is performed by passing the laminate between the first-stage rolling rollers. If the integration of the base material sheet and the lead alloy foil is not successful in the initial rolling process, the lead alloy foil peels off from the base material sheet and warps when the tip of the laminate passes through the gap between the rolling rolls, Since it becomes impossible to let a laminated body pass through the gap | interval between a subsequent rolling roll, rolling of a laminated body fails. In order to prevent such a problem from occurring, a method of manufacturing a lead alloy sheet for an expanding lattice as disclosed in Patent Document 1 and Patent Document 2 has been proposed.

  In the method shown in Patent Document 1, as shown in FIG. 4, the lead alloy foil 3 guided and fed by the guide roller 2 is superposed on the surface of the base material sheet 1 which is continuously cast and transferred. After the superposed base material sheet 1 and the lead alloy foil 3 are passed between a pair of guide rollers 4 and 4 ′ which are disposed to face each other, between the pair of caulking rollers 5 and the pressing roller 6. To supply to the multi-high mill 7.

  A large number of conical protrusions 5 a are formed on the outer periphery of the caulking roller 5. When the superposed base material sheet 1 and the lead alloy foil 3 are supplied between the caulking roller 5 and the pressing roller 6, the lead alloy foil 3 is formed when the protrusion 5 a provided on the caulking roller 5 penetrates the lead alloy foil 3. Part of the lead bites into the base material sheet, so that the lead alloy foil 3 is caulked and joined to the base material sheet 1.

  The base material sheet 1 and the lead alloy foil 3 thus bonded to each other are supplied to the multi-high rolling mill 7 and rolled. The multi-stage rolling mill 7 has a structure in which a plurality of rolling stages each having a pair of rolling rolls 8 and 8 'arranged to face each other with a predetermined gap are arranged in a column. A pair of rolling rolls 8 and 8 'provided in a series of rolling stages are provided such that the gap between them becomes smaller in steps. The laminate of the base material sheet and the lead alloy foil supplied to the rolling mill 7 is reduced in thickness every time it is rolled at each rolling stage, and finally has a composite structure lead alloy having a predetermined thickness. The sheet 9 is processed.

  In the method disclosed in Patent Document 2, as shown in FIG. 5, a lead alloy foil 3 containing at least one of Sn, Sb, and Ag is stacked on a base material sheet 1 of a Pb—Ca-based lead alloy. When rolling the laminated body of the base material sheet 1 and the lead alloy foil 3 with a multi-stage rolling mill, the rolling rate when rolling with the rolling rolls 8 and 8 'of the first rolling stage is set to a large value. In the first rolling stage, the bonding between the base material sheet 1 and the lead alloy foil 3 is ensured, and then the rolling in the subsequent rolling stage is performed. In the method disclosed in Patent Document 2, the thickness of the base material sheet 1 before rolling is a, the thickness of the lead alloy foil 3 before rolling is t, and the base material sheet after being rolled by the first rolling rolls 8 and 8 '. When the thickness of the laminate of 1 and the lead alloy foil 3 is b, the condition of (a + t) /b≧1.3 is established, and the base material sheet 1 and the lead alloy foil 3 and the first rolling stage are rolled. The length of the part in contact with the peripheral surfaces of the rolls 8 and 8 'is set to 10 mm or more.

Japanese Patent No. 4774297 WO2004 / 084331

  In the case of the method disclosed in Patent Document 1, the traces of a large number of holes formed when a large number of protrusions 5a provided on the outer periphery of the caulking roller 5 penetrate the lead alloy foil 3 were produced. It remains over the entire length of the surface of the lead alloy sheet. Since the alloy composition of the trace portion is not the alloy composition of the lead alloy foil 2 but the alloy composition of the base material sheet 1, the surface of the base material sheet has a thin alloy composition different from that of the base material sheet. The significance of forming the layer is diminished.

  In the case of the method shown in Patent Document 2, the rolling ratio of the rolling performed in the first rolling stage is large among the series of rolling processes performed in stages in the multi-high rolling mill. A large load is always applied to the rolling roll. Therefore, it is inevitable that the service life of the rolling mill in the first rolling stage is shortened and the maintenance of the rolling mill becomes troublesome.

  The object of the present invention is to increase the rolling rate in the first rolling in a multi-stage rolling mill without leaving traces of numerous holes penetrating the lead alloy foil over the entire length of the produced lead alloy sheet. The object is to provide a method for producing a lead alloy sheet for an expanded lattice by reliably integrating a lead alloy foil into a base material sheet.

  Another object of the present invention is to provide a method for producing an expanded lattice for a lead storage battery using the lead alloy sheet produced by the above method.

  The present invention is directed to a method for producing a lead alloy sheet for an expanded lattice by integrating a band-shaped lead alloy foil having a different alloy composition from the surface of a belt-shaped base material sheet made of a lead alloy. . In the manufacturing method targeted by the present invention, one surface of the strip-shaped lead alloy foil in the thickness direction is formed on the surface of the strip-shaped base material sheet, and the width direction of the lead alloy foil is matched with the width direction of the base material sheet. The rolling process of laminating the base material sheet and the lead alloy foil in a stacked state and rolling the laminate of the base material sheet and the lead alloy foil between a pair of rolling rolls is performed at a plurality of rolling stages. Thus, a rolling process is performed in which the thickness of the laminate of the base material sheet and the lead alloy foil is gradually reduced.

  In the present invention, a plurality of through holes penetrating the lead alloy foil in the thickness direction are interspersed only at the tip region set near the tip of the strip-shaped lead alloy foil, and the tip region of the lead alloy foil is The sheet is fed between a pair of rolling rolls that perform the rolling process in the first stage of the rolling process in a state of being superimposed on the base material sheet.

  It is preferable to form burrs protruding from one surface of the lead alloy foil on the peripheral edge portion of the open end directed to the base material sheet side of each through hole provided in the tip end region of the lead alloy foil. When the lead alloy foil is stacked on the surface of the base material sheet, one surface of the lead alloy foil from which the burrs protrude is stacked on the surface of the base material sheet.

  According to the present invention, a plurality of through-holes penetrating the lead alloy foil in the thickness direction are scattered in the tip end region set near the tip of the lead alloy foil, and the tip end region of the lead alloy foil is Since the laminated body of the base material sheet and the lead alloy foil is passed between a pair of rolling rolls that perform rolling at the first rolling stage of the rolling process in a state of being superimposed on the surface of the base material sheet, the first rolling is performed. When performing, a part of the lead alloy constituting the base material sheet is bitten into the through hole of the lead alloy foil, so that the base material sheet and the tip end region of the lead alloy foil can be securely bonded, When passing through the rolling roller of the first rolling stage, it is possible to prevent the lead alloy foil from peeling off and warping from the base material sheet. Therefore, when rolling is performed in the second and subsequent rolling stages, the laminate of the base material sheet and the lead alloy foil can be reliably supplied to the gap between the rolling rolls to perform the rolling. It is possible to obtain an expanded lattice lead alloy sheet in which the lead alloy foil is reliably integrated on the surface.

  In addition, the trace of the through hole provided in the tip region of the lead alloy foil remains only in the tip portion of the manufactured lead alloy sheet, and the trace of the through hole extends over the entire longitudinal region of the lead alloy sheet. Therefore, by removing the portion where the trace of the through hole remains, an expanded lattice having no trace of the through hole can be obtained.

  Further, a fray is formed at the peripheral edge of the opening end of each through hole provided in the tip end region of the lead alloy foil that faces the base material sheet side, and one surface of the lead alloy foil from which the burr protrudes is formed on the base material sheet. When it is made to overlap with the surface of the metal, the apparent thickness of the laminate of the base material sheet and the lead alloy foil is increased at the portion where the burrs are formed, and the laminate of the base material sheet and the lead alloy foil is formed. On the other hand, the rolling rate of the lead alloy foil can be increased at the portion where the burrs are formed when the first rolling is performed. Therefore, the bond strength between the base material sheet obtained by the first rolling and the lead alloy foil can be increased, the peeling of the lead alloy foil can be surely prevented, and the laminate of both can be more reliably rolled. it can. Since the burrs can be easily crushed during the first rolling, it is possible to prevent the rolling roll from being overwhelmed, and the overall rolling rate of the laminate of the base material sheet and the lead alloy foil is increased. As in the case of the conventional technique, it is possible to prevent the life of the rolling roll from being shortened.

In one embodiment of the present invention, a lead alloy foil having a different alloy composition from the base material sheet is stacked on a strip-shaped base material sheet made of a lead alloy, and these laminates are used for the first rolling stage of the multi-high rolling mill. It is the perspective view which showed the state just before starting the process of rolling through between rolls. In one embodiment of the present invention, the state after rolling a laminated body of a strip-shaped base material sheet made of a lead alloy and a lead alloy foil through the rolling rollers of the first rolling stage of the multi-high rolling mill is schematically shown. It is sectional drawing shown. (A) And (B) is sectional drawing which showed the example from which the shape of the through-hole scattered in the front-end | tip part area | region of lead alloy foil differs in one Embodiment of this invention, respectively. It is the side view which showed the state which is rolling the laminated body of a base material sheet and lead alloy foil in the manufacturing method of the conventional lead alloy sheet for expanded lattices. In the conventional manufacturing method of the other lead alloy sheet for expanded lattices, it is the side view which showed the state at the time of giving the first rolling to the laminated body of a base material sheet and lead alloy foil.

An embodiment of the present invention will be described below with reference to FIGS.
In the method for producing a lead alloy sheet for an expanded lattice according to the present invention, the surface of a strip-shaped base material sheet made of a lead alloy has one of the thickness directions of the strip-shaped lead alloy foil having a different alloy composition from the base material sheet. The base material sheet and the lead alloy foil are laminated with the surfaces overlapped with the width direction of the lead alloy foil aligned with the width direction of the base material sheet. By repeatedly performing the rolling process of rolling the laminate of the base material sheet and the lead alloy foil between a pair of rolling rolls at a plurality of rolling stages, the thickness of the laminate of the base material sheet and the lead alloy foil A lead alloy sheet for an expanding lattice is manufactured by integrating a lead alloy foil on the surface of the base material sheet by performing a rolling process that gradually reduces.

  In producing a lead alloy sheet for an expanded lattice by the production method according to the present invention, it is preferable to use a Pb—Ca—Sn alloy as the base material sheet. It is preferable to use a Pb—Ca—Sn alloy containing 0.03 to 0.1% by mass of Ca and 0.8 to 1.8% by mass of Sn. The thickness of the base material sheet is preferably about 10 to 20 mm.

  The lead alloy foil integrated with the surface of the base material sheet in order to improve the adhesion between the expanded lattice and the active material is made of a lead alloy containing at least one selected from the group consisting of Sn, Sb and Ag. Preferably it is. Here, the Sn content is preferably 1 to 10% by mass, and the Sb content is preferably 1 to 10% by mass. Moreover, it is preferable that content of Ag is 0.05-1 mass%. The thickness of the lead alloy foil is about 0.05 to 0.3 mm.

  In the present embodiment, the laminate formed by superimposing the base material sheet and the lead alloy foil is supplied to a multi-stage rolling mill having a plurality of rolling stages having a pair of rolling rolls, and is performed at each rolling stage. By expanding the thickness of the laminated body by cold rolling step by step, a lead alloy foil having a different alloy composition from that of the base material sheet is integrated on the surface of the base material sheet. Manufacture lead alloy sheets for lattices. The final thickness of the manufactured lead alloy sheet is appropriately determined according to the design of the lead storage battery, but is usually about 0.5 to 1.5 mm.

  When producing an expanded lattice for a lead storage battery using the lead alloy sheet for an expanded lattice produced as described above, first, in the region where the lead alloy foil of the lead alloy sheet for the expanded lattice is integrated, An expanding process is performed in which a large number of slits extending in the longitudinal direction of the lead alloy sheet and penetrating the lead alloy sheet in the thickness direction are formed in a staggered manner, and the lead alloy sheet in which the slits are formed is expanded in the width direction. As a result, each slit is expanded to form a mesh, and an expanded grid for a lead storage battery having a structure in which a large number of meshes are arranged vertically and horizontally is manufactured.

  FIG. 1 shows an embodiment of the present invention in which a lead alloy foil is stacked on a strip-shaped base material sheet made of a lead alloy, and these laminates are passed between rolling rollers of the first rolling stage of a multi-stage rolling mill. The state immediately before starting the rolling process is shown. In the figure, 1 is a base material sheet made of a lead alloy, and this base material sheet is made by a method such as letting a molten Pb—Ca-based lead alloy flow out from a nozzle having a slit of a predetermined dimension formed at the tip. It is continuously cast and fed in the longitudinal direction.

  Reference numeral 3 denotes a strip-shaped lead alloy foil made of a lead alloy having an alloy composition different from that of the lead alloy constituting the base material sheet. This lead alloy foil 3 is unwound from a roll (not shown), and its width direction is made to coincide with the width direction of the strip-shaped base material sheet 1 and is positioned at a predetermined position with respect to the width direction of the base material sheet 1. In this state, it is fed in the same direction as the base material sheet 1 that is continuously cast and fed, and is superposed on the base material sheet 1.

  In the illustrated example, after the lead alloy foil 3 is integrated with the base material sheet 1 to form a lead alloy sheet for an expanded lattice, a constant width region at the center in the width direction and a constant width near both ends in the width direction. Expanding is applied to two regions having a constant width excluding the region. In FIG. 1, W1 and W2 indicate two regions of the base material sheet on which the expansion processing is performed after the lead alloy sheet is formed, and Wo indicates a central region where the expansion processing is not performed. In addition, We1 and We2 indicate regions near one end and the other end in the width direction where the base material sheet 1 is not expanded.

  In the illustrated example, two lead alloy foils 3 and 3 arranged in parallel in regions W1 and W2 of the surface of the base material sheet 1 which are subjected to the expansion process in the subsequent expansion process are respectively arranged in the width direction. Are aligned with the width direction of the base material sheet 1 and are positioned so as to be accurately positioned on the areas W1 and W2 of the base material sheet 1 where the expanding process is performed. By laminating, a laminated body of the base material sheet 1 and the lead alloy foils 3 and 3 is configured. And this laminated body is rolled by passing the gap | interval between a pair of rolling rolls 8 and 8 'of the first rolling stage of a multi-high rolling mill, and lead alloy foils 3 and 3 are formed on the surface of the base material sheet 1. Join.

  In the present invention, as shown in FIG. 1, a constant length dimension S is provided in the longitudinal direction of each of the lead alloy foils 3 and 3 stacked on the belt-shaped base material sheet 1 near each tip. The front end regions 3A and 3A are set, and a plurality of through holes 3a penetrating in the thickness direction are scattered only in the front end region of each of the lead alloy foils 3 and 3. Then, the lead alloy foils 3, 3 are positioned in the width direction of the base material sheet 1 as described above, and the tip regions 3 A, 3 A of the lead alloy foils 3, 3 are overlapped on the surface of the base material sheet 1. A laminated body of the base material sheet 1 and the lead alloy foils 3 and 3 is formed, and this laminated body is supplied between the rolling rolls 8 and 8 'of the first rolling stage and rolled cold.

  As described above, a plurality of through holes 3a penetrating the lead alloy foil in the thickness direction are scattered in the tip region 3A set near the tip of the lead alloy foil 3, and the tip of the lead alloy foil 3 A laminated body of the base material sheet 1 and the lead alloy foil 3 is formed by overlapping the region on the surface of the base material sheet 1, and this laminated body is formed between a pair of rolling rolls 8 and 8 'that perform the first rolling in the rolling process. 2, as shown in FIG. 2, when the first rolling is performed, a part 1 a of the lead alloy constituting the base material sheet 1 is bitten into the through hole 3 a of the lead alloy foil 3. Thus, the base material sheet 1 and the tip end region 3A of the lead alloy foil 3 can be mechanically reliably bonded. If the tip region 3A of the lead alloy foil 3 is securely bonded to the base material sheet 1, the tip of the laminate of the base material sheet 1 and the lead alloy foil 3 is the gap between the rolling rolls of the first rolling stage. Since the lead alloy foils 3 and 3 can be prevented from peeling off from the base material sheet 1 and warping when passing, the laminate can be reliably supplied between the rolling rolls of the second rolling stage. it can. Accordingly, even in the second and subsequent rolling stages, the laminate of the base material sheet 1 and the lead alloy foils 3 and 3 can be reliably rolled, and the lead alloy foil is firmly integrated with the surface of the base material sheet. The obtained lead alloy sheet can be obtained.

  The laminated body of the base material sheet 1 and the lead alloy foils 3 and 3 rolled by the rolling rolls 8 and 8 'of the first rolling stage is further rolled by the rolling rolls of the second and subsequent rolling stages. The laminate of the base material sheet 1 and the lead alloy foils 3 and 3 is more firmly integrated while gradually reducing the thickness in the process of being rolled by a plurality of rolling rolls, and rolling by a rolling roll at the final stage, It is processed into an expanded lattice lead alloy sheet having a final thickness.

  According to the method of the present invention, the trace of the through hole 3a remains at the tip of the produced lead lattice sheet for the expanded lattice, but the trace of the through hole 3a remains only at the tip of the lead alloy sheet. There are no traces of through-holes in the most part of the obtained lead alloy sheet, so cut and remove the part where the traces of through-holes near the tip of the manufactured lead alloy sheet remain Thus, the trace of the through hole can be prevented from remaining in the expanded lattice manufactured in a later step. The work of removing the portion of the expanded grid lead alloy sheet where the trace of the through hole remains may be performed before the expansion process, and after the expansion process, the trace of the through hole of the expanded grid remains. You may carry out by excising the part which exists.

  The longer the length dimension S (the dimension measured in the longitudinal direction of the lead alloy foil 3) S of the lead alloy foil 3 in which the plurality of through holes 3a are scattered, the longer the base sheet 1 and the lead. Although the bonding of the alloy foil 3 can be ensured, it is preferable not to make the length dimension S of the tip region 3A of the lead alloy foil 3 longer than necessary in order to reduce wasted material. As a result of the experiment, the length dimension S measured in the longitudinal direction of the lead alloy foil 3 from the tip of the lead alloy foil 3 in the tip region 3A of the lead alloy foil 3 interspersed with the plurality of through holes 3a is set to 30 mm. It has been clarified that, if set, the lead alloy foil can be reliably prevented from peeling from the base material sheet when passing through the first rolling stage. Therefore, the length S of the tip region 3A of the lead alloy foil is preferably set to a length that is 30 mm or more and is not too long.

The through hole 3a can be a circular hole having a diameter of 1 mm or more. The plurality of through holes 3a are preferably interspersed in the tip end region of the lead alloy foil 3 at a density at which one or more through holes exist per 1 cm ² . When the inner diameter of the through-hole 3a is increased, the base material sheet 1 is formed when the leading end of the lead alloy foil 3 is overlapped on the surface of the base material sheet 1 and both are fed between the rolling rollers of the first rolling stage and rolled. It is possible to make it easier for the lead alloy to enter into the through hole 3a.

  3A and 3B show examples in which the cross-sectional shapes of the through holes provided in the tip region of the lead alloy foil 3 are different. In the example shown in FIG. 3 (A), an example is shown in which the through hole 3a is formed by shear punching into a clean shape free of burrs.

  FIG. 3B shows one surface of the lead alloy foil 2 on the peripheral edge of the end portion of the through hole 3a located on the one surface of the lead alloy foil 2 (the surface superimposed on the surface of the base material sheet) 3s. This is an example in which the burrs 3b protruding from 3s are formed. In this case, rolling is performed in a state where one surface 3 s of the lead alloy foil 3 from which the burrs 3 b protrude is overlapped on the surface of the base material sheet 1. The burrs 3b can be formed by piercing a lead-shaped alloy foil 2 with a pointed conical tool.

  As described above, the burrs 3b projecting from one surface of the lead alloy foil are formed on the peripheral edge of the open end of the through hole 3a provided in the tip region 3A of the lead alloy foil 3 facing the base material sheet 1 side. When one surface 3s of the lead alloy foil from which the burrs 3b protrude is overlaid on the surface of the base material sheet 1, the laminate of the base material sheet 1 and the lead alloy foil 3 is formed at the portion where the burrs 3b are formed. The apparent thickness can be increased. Therefore, when the first rolling is performed on the laminate of the base material sheet 1 and the lead alloy foil 3, the rolling rate of the lead alloy foil is increased at the portion where the burrs 3b are formed, and is obtained by the first rolling. The bond strength between the base material sheet and the lead alloy foil can be increased, and the laminate of both can be rolled more reliably.

  In this case, the rolling rate is increased only in the portion of the burrs formed at the peripheral edge of the opening end of the through hole of the lead alloy foil, and the portion of the burrs 3 can be easily crushed during rolling. It is possible to prevent a large burden from being applied to the rolling roll of the first rolling stage. Therefore, the life of the rolling roll is shortened as in the case of the method shown in Patent Document 2 in which the overall rolling rate of the laminate of the base material sheet 1 and the lead alloy foil 3 is increased. Can be prevented.

  It is preferable that the protrusion height from the one surface 3s of the lead alloy foil 3 of the burrs 3b provided at the peripheral edge of the through hole 3a provided in the tip region 3A of the lead alloy foil 3 is set to 0.05 mm or more. When the protrusion height of the burrs 3b is set in this way, the effect obtained by providing the burrs 3b appears remarkably.

  In the expanded grating manufacturing method for manufacturing an expanded grid for a lead storage battery using the lead alloy sheet manufactured by the manufacturing method of the above embodiment, the lead alloy foil of the expanded grid lead alloy sheet manufactured as described above is used. A large number of slits extending in the longitudinal direction of the lead alloy sheet are formed in a zigzag shape by making a large number of cuts in the region where 3 and 3 are integrated, and the lead alloy sheet in which the slit is formed is formed in the width direction. The expanding process is performed. In the process of developing the lead alloy sheet in the width direction, an expanded lattice for a lead storage battery is manufactured by expanding each slit into a mesh shape.

  Expanded grids are formed in the regions W1 and W2 on both sides of the central region Wo in the width direction of the lead alloy sheet. In a later step, a long expanded grid is punched out to form a large number of current collectors for the electrode plates. A constant width region (region corresponding to Wo in FIG. 1) in the center in the width direction of the expanded lattice that is not subjected to the expansion process is formed by punching the expanded lattice to form a large number of current collectors. Molded to the shape of the ear. After punching out the expanded lattice to form a current collector, the current collector is filled with a paste-like active material to produce an electrode plate.

  In the above description, a current collector is formed by punching out a long expanded lattice, and then the active material paste is filled into the current collector to produce an electrode plate. It is possible to take a method of manufacturing a large number of electrode plates by punching out the portions constituting each electrode plate after filling. Thus, when taking a method of punching each electrode plate after filling a long expanded lattice with an active material, punching out a constant width region in the center of the width direction of the expanded lattice, the ear of each current collector The step of forming may be performed before the step of filling the active material. Various methods are known as a method for producing an electrode plate for a lead storage battery using a long expanded grid, but the long expanded grid obtained by the method of the present invention can be obtained by any method. The present invention can also be applied when manufacturing.

  Examples of the present invention will be described below. In this example, the base material sheet 1 made of a lead alloy was made of a lead alloy having an alloy composition of Pb-0.07 mass% Ca-1.2 mass% Sn. The thickness of the base material sheet 1 before rolling is 11 mm. Moreover, as the lead alloy foil 3, a lead alloy foil having a Pb-5.0 mass% Sn-5.0 mass% Sb alloy composition was used. The thickness of the lead alloy foil 3 was 0.2 mm. The final thickness of the lead alloy sheet was set to 1.1 mm by superimposing the lead alloy foils 3 and 3 on the base material sheet by the method described based on FIG. In any rolling process of the rolling process, as the pair of rolling rolls 8 and 8 ', rolls having the same diameter of 155 mm were used.

  A lead alloy sheet having a thickness of 1.1 mm was manufactured, and then an expansion process was performed on a region where the lead alloy foils 3 and 3 of the obtained lead alloy sheet were integrated to manufacture a long expanded lattice. After this long expanded lattice was filled with the paste-like active material, the portions constituting each electrode plate were punched out to produce a large number of current collectors for the electrode plates.

Hereinafter, the embodiment of the present invention will be specifically described in comparison with the conventional example, focusing on the features of the present invention.
[Example 1]
A region having a length of 30 mm from the tip of the lead alloy foil 3 was defined as a tip region 3A, and through-holes 3a having a substantially circular outline in cross section were dotted in the tip region 3A. The through holes 3a had a diameter of 2 mm and were scattered at a density of ² per 1 cm ² . The through hole 3a was provided by shear punching. The through hole 3a provided in the present embodiment is as shown in FIG. 3A, and no burrs are provided at the peripheral edge of the end portion. The value calculated by the formula (a + t) / b described with reference to FIG. 5 before and after passing the laminate of the base material sheet 1 and the lead alloy foil through the gap between the rolling rolls of the first rolling stage of the multi-high rolling mill. Was 1.17. In order to set the thickness of the finally obtained lead alloy sheet to a desired thickness (1.1 mm), the number of subsequent rolling stages and the pressure applied to each rolling roll for rolling are appropriately set. In this example, ten rolling stages including the first rolling stage were provided, and rolling was performed to reduce the thickness of the laminated body stepwise.

[Example 2]
As described based on FIG. 3B, the burrs 3 b that protrude outward (from the base material sheet side) from the one surface 3 s of the lead alloy foil 3 were formed on the periphery of the through hole 3 a. The length S of the tip end region 3A interspersed with the through holes 3a was 30 mm. The through-hole 3a was tapered so that the diameter decreased toward the one surface 3s side of the lead alloy foil 3, and the maximum diameter was 2 mm. The through holes 3a were scattered at a density of ² per 1 cm ² . The through hole 3a was formed by piercing a conical protrusion in the tip end partial region 3A. The burrs 3b formed at the peripheral edge of the through hole 3a protrude from the one surface 3s of the lead alloy foil 3 with a height of 0.5 to 1.5 mm.
The value calculated by the formula (a + t) / b described with reference to FIG. 5 before and after passing the laminate of the base material sheet 1 and the lead alloy foil through the gap between the rolling rolls of the first rolling stage of the multi-high rolling mill. Was 1.14. Also in this example, ten rolling stages including the first rolling stage were provided, and rolling was performed to reduce the thickness of the laminated body stepwise.

[Conventional example]
A lead alloy foil 3 not provided with a through hole 3a in the tip region 3A was placed on the surface of the base material sheet 1 and both were rolled. Before and after passing the laminate of the base material sheet and the lead alloy foil through the first roll gap, the value calculated by the formula (a + t) / b was 1.6. In this example, six-stage rolling rolls including the first rolling roll were provided, and rolling was performed to reduce the thickness step by step. In this example, the rolling rate at the time of rolling with the first rolling roll is increased, and the value calculated by the formula (a + t) / b is made larger than that in Example 1 and Example 2, so that the rolling as a whole is performed. The number of stages is smaller than that in the first and second embodiments.

In any of the above-described Example 1, Example 2, and the conventional example, the lead alloy sheet 4 in which the lead alloy foil 2 is reliably integrated with the base material sheet 1 can be manufactured, and the characteristic as an expanded lattice is also achieved. There was no difference.
However, in Example 1 and Example 2 of the present invention, before and after passing the base material sheet and the lead alloy foil between the first rolling rolls, the value calculated by the formula (a + t) / b is set small. Nevertheless, the lead alloy foil 2 could be reliably integrated with the base material sheet 1 by rolling. From this, according to the present invention, it was clarified that the load applied to the first pair of rolling rolls can be reduced, so that the rolling roll can be prevented from being damaged and its life can be extended.

  In particular, as in Example 2, when the burrs 3b are formed on the peripheral edge of the end portion on the base material sheet side of the through holes 3a scattered in the tip region of the lead alloy foil 3, the portion where the burrs 3b exist As the apparent thickness of the lead alloy foil 3 is increased, the rolling rate of the lead alloy foil 2 is increased in the portion where the burrs 3a are present when the lead alloy foil 3 is rolled by the first rolling roll. 1 can be easily integrated. Therefore, the integration of the lead alloy foil and the base material sheet in the initial stage of rolling can be made more reliable, and the lead alloy foil that has passed through the rolling roller of the first rolling stage peels from the base material sheet, It is possible to reliably prevent a situation in which rolling at the second and subsequent rolling stages is not performed well. Since the burrs are locally provided and thin, they can be easily crushed without particularly increasing the load applied to the rolling roll of the first rolling stage. Therefore, even if burrs are provided on the peripheral edge of the opening end of the through hole provided in the tip region of the lead alloy foil, the burden on the first stage rolling roll does not increase, and the life of each roll is shortened. There is no.

[Reference example]
In the conventional example, the value calculated by the formula (a + t) / b is 1.2. When the lead alloy foil 3 is overlapped on the base material sheet 1 and the both are passed between the rolling rolls of the first rolling stage, the lead alloy foil 3 is wound around the peripheral surface of the upper roll of the pair of rolling rolls. As a result, the lead alloy foil could not be integrated into the base material sheet.

  According to the present invention, traces of a large number of holes penetrating the lead alloy foil remain over the entire length of the manufactured lead alloy sheet, or it is necessary to increase the rolling rate in the first rolling performed in a multi-stage rolling mill. Therefore, the lead alloy foil for the expanded lattice is securely integrated with the base material sheet by rolling without causing the problems of the prior art that the burden on the rolling mill becomes excessive. Since it can be manufactured, the applicability in the field of lead-acid batteries using an expanded grid as a current collector is great.

DESCRIPTION OF SYMBOLS 1 Lead alloy base material sheet | seat 3 Lead alloy foil 3a Through-hole 3b Frog 5 Caulking roll 5a Protrusion 8,8 'A pair of rolling roll 9 Lead alloy sheet for expanded lattices

Claims (6)

On the surface of the strip-shaped base material sheet made of a lead alloy, one surface in the thickness direction of the strip-shaped lead alloy foil having an alloy composition different from that of the base material sheet is set, and the width direction of the lead alloy foil is set on the surface of the base material sheet. A rolling process in which the base material sheet and the lead alloy foil are laminated in a state of being aligned in the width direction, and the laminate of the base material sheet and the lead alloy foil is rolled between a pair of rolling rolls. An expand in which the lead alloy foil is integrated with the base material sheet by performing a rolling process in which the thickness of the laminate of the base material sheet and the lead alloy foil is reduced stepwise by performing at a plurality of rolling stages. A method for producing an expanded lattice lead alloy sheet for producing a lattice lead alloy sheet,
A plurality of through holes penetrating the lead alloy foil in the thickness direction only in the tip region set near the tip of the strip-shaped lead alloy foil,
Supplying between a pair of rolling rolls that perform the first rolling process of the rolling process in a state where the tip region of the lead alloy foil is overlaid on the base material sheet;
A method for producing a lead alloy sheet for an expandable grid.   The lead alloy sheet for an expandable lattice according to claim 1, wherein the length dimension of the tip end region of the lead alloy foil measured from the tip end of the lead alloy foil to the rear side in the longitudinal direction is set to 30 mm or more. Manufacturing method. The through hole has a diameter of 1 mm or more, and the plurality of through holes are scattered at a tip region of the lead alloy foil at a density of 1 or more per 1 cm ^2. A method for producing a lead alloy sheet for an expanded lattice as described in 1 or 2.   The burrs protruding from the one surface of the lead alloy foil are formed on the peripheral edge of the open end of the through-hole provided in the lead alloy foil toward the base material sheet side. Item 4. A method for producing a lead alloy sheet for an expanded lattice according to any one of Items 1 to 3.   The method for producing a lead alloy sheet for an expanded lattice according to claim 4, wherein a protrusion height of the burrs from one surface of the lead alloy foil is 0.05 mm or more.   An area where the lead alloy foil of the lead alloy sheet for an expanded lattice manufactured by the manufacturing method according to any one of claims 1 to 5 is integrated, penetrates the lead alloy sheet in the thickness direction, and Expanding a lead alloy battery by forming a plurality of slits extending in the longitudinal direction of the lead alloy sheet in a zigzag manner and performing an expanding process to expand the lead alloy sheet in which the slits are formed in the width direction. The manufacturing method of the expanded grating | lattice for lead acid batteries characterized by manufacturing a grating | lattice.

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