JP4092817B2 - Method for producing expanded grid for lead-acid battery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an expanded lattice used for a lead storage battery.
[0002]
[Prior art]
Generally, there are a casting method and an expanding method as a method for manufacturing a lead-acid battery grid. Recently, a grid made of a lead-calcium alloy developed in response to a maintenance-free requirement of a lead storage battery tends to be produced by an expanding process with high productivity. As this expanding process, a method of forming a lattice network by forming slits in a rolled sheet of lead alloy using a die blade that moves reciprocally and expanding the slit portions is widely used. Here, the die blade slits the rolled sheet and develops the lattice mesh in the direction perpendicular to the rolled sheet surface. The lattice mesh portion thus formed is flattened by a roller or a flat press.
[0003]
[Problems to be solved by the invention]
As described above, in the process of flattening the lattice mesh portion, the lattice bones constituting the lattice mesh portion are deformed. When using a roller or flat press to press the lattice bone perpendicular to the lattice plane, the deformation of the lattice bone is not only in the direction perpendicular to the lattice plane, but also in the width direction of the lattice (in the rolling sheet length direction). Equivalent) and the height direction (corresponding to the rolling sheet width direction). In such a case, an accurate developed dimension of the lattice mesh cannot be obtained. Such an inaccurate grid mesh development size actually acts to increase the variation in the height dimension of the electrode plates, and causes problems in the assembly process of the electrode plate group, which is a subsequent process. It was.
[0004]
The present invention relates to a method for manufacturing an expanded lattice used in a lead-acid battery as described above, and reduces the variation in the development size of the grid network and reduces the variation in the electrode plate size, thereby causing a problem in the electrode group assembly process. It aims at suppressing generation | occurrence | production of this.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention forms a plurality of slits parallel to each other in a lead alloy sheet in a staggered manner, and a line portion formed by the plurality of slits is formed on the lead alloy sheet surface. A lead-acid battery expanding grid body that expands and expands in one of the vertical directions, and a distance in the width direction of the lead alloy sheet from the vicinity of the non-expanded portion in contact with the expanded portion where the plurality of slits are formed The width of the linear portion is made smaller as the gap is separated, and the unfolded portion is passed through a pair of rollers having a gap that is at least larger than the thickness of the lead alloy sheet. While flattening, the lead alloy sheet can be developed in the width direction with even smaller variations.
[0006]
According to a second aspect of the present invention, in the expanded portion that passes between the rollers in the method for producing an expanded lattice body according to the first aspect, at least an intersection portion between the linear portions adjacent to the non-expanded portion is While contacting with the roller, a part of the intersection of the linear portions separated by a distance in the width direction of the lead alloy sheet of the linear portions does not contact the roller.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described.
[0008]
FIG. 1 is a view showing a state in which slits are sequentially formed by a die blade 2 in which a rolled sheet 1 of lead alloy moves up and down. During the vertical movement of the die blade 2, the rolled sheet 1 is intermittently moved in the direction A shown in FIG. The die blade 2 forms slits on the surface of the rolled sheet, and the lattice bone 3 (corresponding to the linear portion) is developed along the die blade surface 2a in the vertically downward direction of the surface of the rolled sheet 1 to form the lattice network 4. The As shown in FIG. 2, the lattice mesh 4 is formed on both the left and right sides of the rolled sheet 1, leaving the non-mesh portion 5 at the center of the rolled sheet 1. As for the non-mesh part 5, a lattice ear part (not shown) is formed by press work.
[0009]
As shown in FIG. 3, the rolled sheet 1 on which the lattice network 4 is formed is flattened by passing between a pair of rollers 6 and 6 'having a space therebetween, and the lattice network 4 is rolled into the rolled sheet. Expanding in the width direction is adjusted to a predetermined dimension of the grid mesh. FIG. 4 is a view showing a cross section in the thickness direction of the lattice mesh 4 before passing through the rollers 6 and 6 ′. Here, the lattice mesh 4 has a slit width (dimension B in FIG. 4) that increases as it approaches the non-mesh portion 5. Therefore, the thickness dimension of the intersecting portion 7 of the lattice bone 3 in the lattice mesh 4 increases as it approaches the non-mesh portion 5.
[0010]
Next, as shown in FIG. 5, the rolled sheet 1 on which such a lattice network 4 is formed is passed through rollers 6, 6 '. As for the gap dimension (C dimension in FIG. 5) of the rollers 6 and 6 ′, the one close to the non-mesh part 5 of the intersection 7 is pressed and deformed by the rollers 6 and 6 ′ in the thickness direction of the lattice mesh 4. Here, the intersection portion 7 ′ distant from the non-mesh portion 5 in the intersection portion 7 has a smaller degree of deformation received by the rollers 6, 6 ′ than the deformation received by the other intersection portions 7. Therefore, a part of the deformation received by the intersection 7 appears as a deformation in the lattice height direction (D direction in FIG. 5). In this way, the deformation received by the intersection portion 7 is always the deformation in the lattice height direction, so that the variation in the adjustment of the development dimension of the mesh portion can be reduced. Furthermore, it is of course possible that the intersection 7 ′ that is closest to the portion of the lattice mesh 4 that is farthest from the non-mesh 5 is in contact with the rollers 6 and 6 ′.
[0011]
【Example】
An expanded lattice body according to the above-described embodiment of the present invention was created. As the rolled sheet, a rolled body of lead-tin-calcium alloy containing 1.0% by mass of tin and 0.06% by mass of calcium was used. The sheet thickness is 1.1 mm. The width dimension of the lattice bone was 1.40 mm at the part in contact with the non-mesh part, and was gradually reduced in increments of 0.1 mm, and 0.90 mm at the part farthest from the non-mesh part. Such a lattice mesh was passed through a roller having a gap of 1.9 mm, and flattening and width dimension adjustment were performed. In this case, the intersection point close to the non-mesh part is pressed by the roller, but the intersection point away from the non-mesh part does not contact the roller. Such a lattice network according to this embodiment is defined as a lattice network A. Next, a lattice network B according to this example was created with a roller gap of 1.5 mm.
[0012]
As the lattice mesh C of the conventional example, the width dimension of the lattice bone was fixed to 1.2 mm, and it was passed between rollers with a gap of 1.9 mm. The state of contact between the intersection of the lattice mesh C and the roller in this conventional example is constant regardless of the distance from the non-mesh portion of the intersection. The developed dimensions of the mesh portions of the lattice meshes A and B of the present embodiment and the lattice mesh C of the conventional example thus created were measured. The result is shown in FIG. From the results shown in FIG. 6, it can be seen that according to the configuration of the present invention, the variation in the development dimension of the lattice mesh portion can be reduced as compared with the conventional configuration.
[0013]
【The invention's effect】
As described above, according to the present invention, in the expanded lattice body used for the lead storage battery, variation in the development size of the lattice network is reduced, and an electrode plate with high dimensional accuracy can be easily obtained, which is extremely useful industrially.
[Brief description of the drawings]
FIG. 1 is a diagram showing a state where slits are formed in a general expanding process. FIG. 2 is a diagram showing a rolled sheet on which a lattice network is formed according to the present embodiment. FIG. FIG. 4 is a diagram showing a cross section in the thickness direction of the lattice mesh portion according to the present embodiment. FIG. 5 is a diagram showing a contact state between the lattice mesh portion and the roller according to the embodiment. 6 is a diagram showing variation in the development dimension of the lattice mesh portion according to the present embodiment and the conventional example.
DESCRIPTION OF SYMBOLS 1 Rolled sheet 2 Die blade 2a Die blade surface 3 Lattice bone 4 Lattice mesh 5 Non-mesh part 6, 6 'Roller (pair)
7, 7 'intersection

Claims (2)

A method of manufacturing an expanded grid for a lead-acid battery, wherein a plurality of slits parallel to each other are formed in a staggered pattern on a lead alloy sheet, and the slits are expanded and extended in the vertical direction of the slits. At least one side of the formed developed part is provided with a non-developed part, a linear part is provided between the slits, and the width dimension of the linear part is increased from the non-developed part toward the slit developed direction. And at least between a pair of rollers having a gap that is larger than the thickness of the lead alloy sheet and that is smaller than the thickness of the intersection portion of the linear portion on the non-deployed portion side of the developed portion. A method for producing an expanded lattice for a lead-acid battery, wherein the development part is passed. The developing part that passes between the rollers, at least the intersection part of the linear part adjacent to the non-developing part is in contact with the roller, and at least the intersection part of the linear part furthest away from the non-developing part is not in contact with the roller The manufacturing method of the expanded lattice body for lead acid batteries of Claim 1 characterized by the above-mentioned.

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