JP2003031226A - Method of manufacturing lead-acid battery and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a lead-acid battery and its device, preventing the corrosion of an edge part of a cell of a grid by inclining a gap surface 1c between projection parts 1a of a disc cutter 1, and preventing capacity drop and short life of the lead-acid battery. SOLUTION: A rotary type expander disc cutter 1 is formed in such a way that conical projection parts 1a whose top 1b is inclined forward in the rotation direction are projected from a circumferential surface A at distant equal intervals, a gap surface 1c which is a circumferential side surface between the projection parts 1a is formed on a surface where all contact surface coming in contact with the gap surface 1c is inclined toward the center side in more front side than the contact surface coming in contact with the circumferential surface A which becomes the same angle position on the rotation shaft of the disc cutter 1. A slit 2a in which a knotting part 2b is inclined is formed in a lead sheet 2 with the disc cutter 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a lead storage battery for manufacturing a grid of polar plates by a rotary expander.

[0002]

2. Description of the Related Art An electrode plate of a lead-acid battery is a grid of grids made of lead or a lead alloy filled with an active material. In addition to directly forming lead or lead alloy by casting or the like, this lattice body may form a grid by an expander on a lead sheet made of lead or lead alloy. In addition, this expander has a reciprocating system in which each square is formed on the lead sheet in order from the both ends by the top and bottom of the die cutter, and a staggered slit is formed on the lead sheet by rotating the disc cutter, and this lead sheet is placed on both sides. There is a rotary system in which the slits are expanded into a diamond-shaped cell by spreading the slits.

As shown in FIG. 3, the disk cutter 1 of the rotary expander has a large number of chevron-shaped projections 1a projecting toward the outer periphery at equal angular intervals on the peripheral side surface of a thin disk. It is a thing. As shown in FIG. 4, each of the convex portions 1a is formed by protruding in a mountain shape from the circumferential surface A of the disk cutter 1 (shown in a plane in FIG. 4), and the top portion of the mountain shape is formed. 1b is provided with a radius.
Further, in these convex portions 1a, the mountain-shaped top portion 1b is formed so as to be biased toward the front side in the rotation direction (indicated by an arrow in the drawing), so that both slopes sandwiching the top portion 1b project from the circumferential surface A. The angle θ ₁₀ on the front side is the angle θ ₂₀ on the rear side.
It is closer to vertical and steeper. These convex portions 1a
A gap surface 1c is formed along the circumferential surface A of the disc cutter 1 on the circumferential side surface between the two. In FIG. 4, the circumferential surface A is shown as a flat surface in order to make the drawing easier to understand, but since it actually has an arc shape, the gap surface 1c is shown.
Is actually an arc shape. However, this gap surface 1c
May be constituted by a plane connecting the intersecting lines of the circumferential surface A and the slopes of the convex portions 1a on both sides thereof. In this case, in FIG. It will appear.

The disc cutter 1 has recesses 1d formed for every other gap face 1c on both sides of the disc. The recess 1d has the same width as the gap surface 1c (distance between the adjacent protrusions 1a) and has a depth about half the thickness of the gap surface 1c (plate thickness of the disc cutter 1). It is a groove formed on the disc surface of the cutter 1, and is formed so as to open at the gap surface 1c on the outer peripheral side and have a certain length toward the center side. Also, the recess 1d
Every other gap surface 1c forming the is formed so as to be staggered on both sides.

The above-mentioned disc cutter 1 is formed into a roll by arranging a large number of discs on the common rotary shaft at intervals of substantially the same thickness as the disc cutter 1. Then, as shown in FIG. 5, two rolls of a large number of disk cutters 1 are arranged above and below, and a lead sheet 2 is passed between them to form a slit 2a. At this time, as shown in FIG. 6, the upper and lower rolls are set at such a height position that the gap surfaces 1c of the upper and lower disc cutters 1 are slightly overlapped with each other without a gap. Also, each disc cutter 1 on the upper roll
So that each disc cutter 1 of the lower roll is located between
It is arranged with a shift of half a pitch in the axial direction. Further, when the gap surface 1c of the disc cutter 1 of the upper roll reaches the lower end, the gap surface 1c of the disc cutter 1 of the lower roll reaches the upper end, and the convex portion 1a of the disc cutter 1 of the upper roll is reached.
The phase of rotation is also adjusted so that the convex portion 1a of the disc cutter 1 of the lower roll reaches the upper end when reaches the lower end. Moreover, as shown in FIG. 6A, the phase of this rotation is such that when the recess 1d on the front surface side of the disc cutter 1 of the upper roll reaches the lower end, It is also adjusted so that the recess 1d reaches the upper end.

As shown in FIG. 5, when the lead sheet 2 is passed between the rolls of the disc cutter 1, slits 2a are formed in the lead sheet 2 by the protrusions 1a of the disc cutters 1 of the upper and lower rolls. Elongated fence-shaped portions between the slits 2a formed in the lead sheet 2 are pushed by the upper and lower convex portions 1a and alternately protrude upward and downward in a mountain shape. Further, in the gap surface 1c of the disc cutters 1 of the upper and lower rolls, the lead sheet 2 is cut and the slit 2a is continuously formed in the portion where the concave portions 1d are back to back (cutting portion B in FIG. 6). , Recess 1
In the portion where d is opposed to each other (non-cutting portion C in FIG. 6), the lead sheet 2 is not cut, and the slit 2a is interrupted to form the knot portion 2b. Therefore, the slits 2a formed on the lead sheet 2 are formed by the lengths of two mountain-shaped peaks pressed by the convex portions 1a, and are continuously formed in the transfer direction while being interrupted midway through the knot portions 2b. It
Further, the adjacent slits 2a are similarly continuously formed at positions where the knot portions 2b are deviated by a half pitch and have a zigzag shape.

Here, the reason why each convex portion 1a of the disk cutter 1 is not formed in the shape of an isosceles triangular shape but the top portion 1b is formed in the shape of an isosceles triangle formed to be biased toward the front side in the rotational direction will be described. The disc cutter 1 forms slits 2a in the lead sheet 2 while rotating, and pushes the fence-shaped portion between the slits 2a by the convex portions 1a to project in a mountain shape. Therefore, when the convex portion 1a has an isosceles triangular mountain shape, the front half of the fence-shaped portion between the slits 2a is gradually extended by the top portion 1b of the convex portion 1a and protrudes in the mountain shape. On the other hand, the rear half is only pushed by the inclined surface rearward of the top portion 1b of the convex portion 1a.
Therefore, in the fence-shaped portion between the slits 2a protruding in a mountain shape, the front half is extended more and the plate thickness is thinned. There was a drawback that the thickness was uneven. However, when the top portion 1b of the convex portion 1a is biased toward the front side,
First, the fence-like front part between the slits 2a is pushed out relatively early by being pushed by almost the entire slope that has risen at a steep angle θ ₁₀ in front, and the rear part is gradually projected along with this rotation. Therefore, the entire fence-like shape is uniformly stretched and the plate thickness is also equalized. For this reason, conventionally, in the rotary expander, as the disc cutter 1, the one in which the tops 1b of the respective convex portions 1a are formed deviated to the front side in the rotational direction is used (Japanese Patent Publication No. 59-59). 3569
(See Japanese Patent Publication No. 4).

The lead sheet 2 having a large number of slits 2a formed as described above is spread out on both sides in the width direction in a later step, so that each slit 2a spreads out in a rhombus-shaped grid, and the electrode plate is formed. The lattice body of is formed.

[0009]

However, in the above-mentioned conventional disk cutter 1, the angle at which both slopes sandwiching the top 1b of each convex portion 1a contact the gap surface 1c is the angle θ ₁₀ on the front side is the rear side. Since the angle is steeper than the angle θ ₂₀ of the lead sheet 2, as shown in FIG. 7, even if the fence-shaped portion between the slits 2a of the lead sheet 2 protrudes in a mountain shape, the bending angle θ on the front side is increased.
₁₁ is steeper than the bending angle θ ₂₁ on the rear side. Therefore, when the lead sheet 2 is expanded and the slits 2a are expanded in a grid pattern, the fence-like portion of the slit 2a sharply bends, and the notch in the knot 2b becomes large or the strength becomes weak. In addition, as shown in FIG. 8, there is a possibility that the length of the knot 2b may be shortened or a crack may occur at the edge portion (edge portion D in FIG. 8).

For this reason, when the grid body of the electrode plate is manufactured by using the disk cutter 1 of the conventional rotary expander, especially when this grid body is used as the positive electrode plate, the knot portions 2b of the frame of the grid and There has been a problem that the edge portion D is eroded and broken by the electrolytic solution from a crack or the like as a starting point and the capacity and life of the lead storage battery are reduced.

The present invention has been made in order to cope with such a situation, and by inclining the gap surface between the convex portions of the disk cutter, it is possible to prevent the edge portion of the grid of the lattice body from being eroded. It is an object of the present invention to provide a method of manufacturing a lead storage battery and an apparatus thereof that can prevent the reduction of the capacity and the shortening of the life of the lead storage battery.

[0012]

According to a first aspect of the present invention, there is provided a method for manufacturing a lead storage battery, wherein a mountain-shaped convex portion whose top is biased toward the front side in the rotational direction at equal angular intervals spaced on a disk-shaped circumferential surface. Parts are projected toward the outer peripheral direction at multiple locations, and the gap surface that becomes the peripheral side surface between each of these convex parts is a circle where all the contact surfaces in contact with this gap surface are at the same angular position about the rotation axis center. Formed on the surface inclined toward the center side toward the front side of the contact surface in contact with the surface,
A rotary expander having grooves formed on both sides of a disk shape at equal angular intervals, and having recesses that are open on alternate surfaces of each gap surface and on alternate surfaces of both surfaces. A disc cutter is used to form a slit in which the knot portion is inclined on the lead sheet.

According to the first aspect of the present invention, since the gap surface between the convex portions of the disk cutter used in the rotary expander is inclined toward the center side toward the front side in the rotation direction, the protrusion adjacent to the rear side is provided. The bending angle between the steep slope of the convex portion and the gentle slope of the convex portion adjacent to the front side is made steep. For this reason,
Since the gap between the gaps between the protrusions and the slopes of the protrusions adjacent to these two sides can be made small, when the slits are formed on the lead sheet, the knots are inclined, There is no need to bend the fence-shaped part between the rear side at a steep angle, and by averaging the bending angles of the rear side and the front side, this edge part is easily eroded by the electrolytic solution. Will be able to prevent. If the gap surface is formed by inclining the circumferential surface, the angle formed between the contact surfaces with the circumferential surface can be made constant at all times. However, this gap surface is
It can also be formed by an inclined flat surface or another curved surface.

According to a second aspect of the present invention, mountain-shaped convex portions whose tops are biased toward the front side in the direction of rotation are projected at a plurality of points toward the outer peripheral direction at equal angular intervals spaced on the disk-shaped circumferential surface. Grooves that are provided and are formed at equal angular intervals on the peripheral portions of both sides of the disk, and are spaced apart from each other by the gap surfaces that are the peripheral side surfaces between the convex portions, and are staggered on both sides. In the lead-acid battery manufacturing apparatus for manufacturing the grid plate of the electrode plate by the rotary expander forming the slits on the lead sheet by using the disk cutter, in which the concave portion opened on the surface is formed,
Make each gap surface of the disk cutter inclined toward the center toward the front side of all the contact surfaces that are in contact with the clearance surface and are in contact with the circumferential surface that has the same angular position at the center of the rotation axis of the disk cutter. It is characterized by being formed.

According to the second aspect of the present invention, since the gap surface between the convex portions of the disk cutter is inclined toward the center side toward the front side in the rotation direction, a steep slope of the convex portions adjacent to the rear side is formed. The bending angle between the two is moderated, and the bending angle between the convex slope adjacent to the front side and the gentle slope is steep. For this reason, it is possible to reduce the difference in angle formed between the gaps between the protrusions and the slopes of the protrusions adjacent to both sides, so that the fence-shaped portion between the slits of the lead sheet has a steep angle only on the rear side. It is possible to prevent the edge portion from being easily eroded by the electrolytic solution by averaging the bending angles of the rear side and the front side. If the gap surface is formed by inclining the circumferential surface, the angle formed between the contact surfaces with the circumferential surface can be made constant at all times. However, the gap surface may be formed by an inclined flat surface or another curved surface.

According to a third aspect of the present invention, the center of the gap surface is closer to the front side than the contact surface that is in contact with the circumferential surface where all the contact surfaces in contact with the gap surface are at the same angular position at the center of the rotation axis of the disk cutter. It is characterized in that it is formed on a surface inclined by 1 ° or more to the side.

According to the third aspect of the present invention, since the inclination of the gap surface between the respective convex portions of the disk cutter is 1 ° or more, the bending angle between the steep inclined surface of the convex portion adjacent to the rear side is set to be small. It will certainly be possible to alleviate.

According to a fourth aspect of the present invention, only the surface of the gap surface excluding the front end is in contact with the circumferential surface having the same angular position at the center of the rotation axis of the disk cutter. It is characterized in that it is formed on a surface inclined toward the center side toward the front side of the contact surface.

The gap surface between the respective convex portions of the disk cutter may be constituted by, for example, an inclined flat surface instead of the inclined surface of the circumferential surface. When the inclination angle of such a plane is small, the contact surface of the circumferential surface may be inclined toward the center toward the front side in the vicinity of the portion adjacent to the convex portion on the front side. In addition, a radius may be formed or a small slope having an intermediate inclination angle may be interposed between the gap surface and the front convex portion. Further, such a contact surface such as a rounded surface or a small slope may be tilted outward more than a contact surface of a circumferential surface at the same angular position. However, according to the invention of claim 4, since the contact surface of the gap surface between the respective convex portions of the disk cutter excluding the front end portion is inclined toward the center side toward the front side, at least the convex portions adjacent to the rear side are adjacent. The bending angle between the steep slope of the portion can be reliably relaxed. In addition, there are cases in which a radius is formed in the adjacent portion between the gap surface and the convex portion on the rear side or a small slope having an intermediate inclination angle is interposed, but the contact surfaces such as the round surface and the small slope are It is always inclined toward the center side with respect to the contact surface of the circumferential surfaces at the same angular position.

According to a fifth aspect of the present invention, the circumferential surface that serves as a reference for the inclination of the gap surface is a flat surface that connects the intersecting lines of the circumferential surface and the slopes of the convex portions on both sides. .

The conventional gap surface is not limited to the surface along the circumferential surface, but may be a flat surface. In such a plane, the rear half is a surface slightly inclined toward the center side toward the front side from the contact surface contacting the circumferential surface at the same angular position, but the front half is at the same angular position. The surface is slightly inclined toward the center toward the rear side of the contact surface contacting the circumferential surface. However, due to this, the angle of the convex portion with respect to the slope is slight, and there is almost no difference from the case where the convex portion is formed on the surface along the circumferential surface. On the other hand, according to the invention of claim 5, since the gap surface between the respective convex portions is further inclined than this plane, the bending angle between at least the steep slope of the convex portions adjacent to the rear side is bent. Will certainly be able to ease.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a partially enlarged front view showing an inclined gap surface of a disk cutter, and FIG. 2 is a slit projecting in a chevron shape in a lead sheet. It is a partial expanded longitudinal cross-section front view which shows the fence-shaped part in between. The constituent members having the same functions as those of the conventional example shown in FIGS. 3 to 8 are designated by the same reference numerals.

In this embodiment, a disk cutter 1 of a rotary expander similar to the conventional example shown in FIG. 3 will be described. The disc cutter 1 is a blade in which a large number of protrusions 1a are provided on the peripheral side surface of a thin disc-shaped steel plate. Each convex portion 1a
Are projected on the peripheral side surface of the disc cutter 1 at a constant angular interval, and adjacent ones are also arranged at a constant interval. As shown in FIG. 1 in which a circumferential surface A having the same radius from the central axis of the disk cutter is developed into a flat surface, each of the convex portions 1a is formed so as to project in a chevron shape from the circumferential surface A, and the chevron shape is formed. Is provided on the top 1b of the.
Further, in each of the convex portions 1a, the top portion 1b is formed so as to be biased toward the front side in the rotation direction, and therefore the angle at which both slopes sandwiching the top portion 1b project from the circumferential surface A is as shown in the conventional example. In addition, the angle θ ₁₀ on the front side is closer to the vertical and steeper than the angle θ ₂₀ on the rear side (hereinafter, for each convex portion 1a, the angle θ ₁₀ side on the front side is “high angle side”, The angle θ ₂₀ side is called the "low angle side").

Between the respective convex portions 1a, a gap surface 1c whose front side is inclined toward the center side with respect to the circumferential surface A of the disk cutter 1 is provided.
Are formed. The gap surface 1c is a surface obtained by rotating the curved surface along the circumferential surface A so that the front side inclines toward the center side with the intersection line with the slope on the high angle side of the rear side convex portion 1a as the central axis. Composed by. Therefore, the gap surface 1c
Means that all the contact surfaces in contact with the gap surface 1c are inclined to the center side by a certain angle toward the front side with respect to the contact surface in contact with the circumferential surface A at the same angular position about the rotation axis of the disk cutter 1. It becomes a face. At this time, the inclination angle of the gap surface 1c is 1 °.
The above is preferable. Since the circumferential surface A is shown as a flat surface in FIG. 1, the gap surface 1c is also expressed as a flat surface inclined at a constant angle with respect to the circumferential surface A. When the gap surface 1c is inclined in this way, the bending angle θ ₃₀ between the convex portion 1a adjacent to the rear side and the high-angle side inclined surface is larger than the angle θ ₁₀ with the circumferential surface A. Get loose. Further, the bending angle θ ₄₀ between the convex portion 1a adjacent to the front side and the slope on the low angle side is smaller than the angle θ ₂₀ with the circumferential surface A and becomes steep. However, since the angle θ ₁₀ with the circumferential surface A is steeper and substantially perpendicular to the angle θ ₂₀ , the angle θ ₄₀ with the gap surface 1c is closer to the angle θ ₃₀ and the difference is small.

The disc cutter 1 has a recess 1 similar to that of the conventional example for every other gap surface 1c on both sides of the disc.
d is formed. Further, the disc cutter 1 configured in this way is made into a roll shape by mounting a large number of discs on the rotating shaft alternately at intervals as in the conventional example shown in FIGS. 5 and 6. Two roll-shaped disc cutters 1 are arranged one above the other. At this time, the arrangement of the rolls of the upper and lower disc cutters 1 is similar to that of the conventional example shown in FIG. 6, but in the case of the present embodiment, at least the gap surface 1c is inclined because the gap surface 1c is inclined. The height position is set such that the surfaces of 1c closest to the center side slightly overlap each other without a gap.

The rotary expander of this embodiment is
A slit 2a is formed in the lead sheet 2 by passing the lead sheet 2 between the upper and lower roll-shaped disk cutters 1. As shown in FIG. 2, in the lead sheet 2, the fence-shaped portion between the slits 2a is pushed by the convex portions 1a of the upper and lower disc cutters 1 and protrudes in a mountain shape. At this time, the nodule portion 2b, in which the slit 2a is interrupted, has the inclined gap surface 1c of the disk cutter 1.
Is formed diagonally, and the bending angle θ ₃₁ with the oblique side on the high angle side of the mountain-shaped protrusion on the rear side is relaxed,
The bending angle θ ₄₁ with respect to the hypotenuse of the low-angle side of the mountain-shaped protrusion on the front side becomes steep, and the difference between these angles becomes small. In the fence-shaped portion between the slits 2a, adjacent ones are vertically divided and protrude in a mountain shape, so that the knotted portion 2b itself has the fence-shaped portions on both sides inclined in the opposite directions. It will be twisted.

Therefore, according to the present embodiment, the lead sheet 2
It is not necessary to bend the fence-shaped portion between the slits 2a of only the high angle side at a steep angle, and it is possible to average the bending angles θ ₃₁ and θ ₄₁ on the high angle side and the low angle side. Therefore, when the lead sheet 2 is expanded and each slit 2a is expanded in a grid pattern, the fence-shaped portion of the slit 2a has a large cut only at the end on the high angle side, and the knot shown in FIG. Since the length of the portion 2b is not shortened or the strength is weakened and cracks are not generated, it is possible to prevent the edge portion of the grid from being easily eroded by the electrolytic solution.

In the above embodiment, the gap surface 1c is
The case where the curved surface along the circumferential surface A is constituted by the rotationally moved surface has been described, but all the contact surfaces in contact with the gap surface 1c are closer to the front side than the contact surface in contact with the circumferential surface A at the same angular position. It may be any surface as long as it is a surface inclined to the center side, and may be a curved surface or a flat surface other than the surface along the circumferential surface A. However, for example, when the gap surface 1c is a flat surface inclined at a slight angle, only the front end portion may be inclined toward the outer peripheral side toward the front side with respect to the contact surface of the circumferential surface A at the same angular position. However, even in such a case, the effect of making the bending angle between the convex portion 1a adjacent to the rear side and the slope on the high angle side gentle is obtained. In addition, a rounded surface or a small slope having an intermediate inclination angle may be interposed between the gap surface 1c and the low-angle slope of the convex portion 1a adjacent to the front side. In this case, not only is the bending angle between the low-angle side slope of the convex portion 1a adjacent to the front side further gentle, but also the bend angle between the rear-side convex portion 1a and the high-angle side slope. The effect of softening is also obtained. That is, at least the front end portion of the gap surface 1c is excluded because the contact surface in contact with the gap surface 1c is a surface inclined toward the center side toward the front side of the contact surface in contact with the circumferential surface A at the same angular position. Any face will do.

In the above embodiment, the gap surface 1c is
The contact surface contacting the gap surface 1c is the circumferential surface A at the same angular position.
The case has been described in which the front surface is inclined toward the center side toward the front side with respect to the contact surface contacting with. The contact surface contacting with the gap surface 1c is the circumferential surface A and the slopes of the convex portions 1a on both sides. It can also be configured by a surface inclined toward the center side toward the front side with respect to the plane connecting the intersection lines. In this case, even if the gap surface 1c is a flat surface inclined at a slight angle, it is a surface that is surely inclined up to the front end portion.

[0031]

EXAMPLE A disk cutter 1 according to the present embodiment in which a slit 2a is formed on a lead sheet 2 and developed by using a conventional disk cutter 1 in which the clearance surface 1c is not inclined and in which the clearance surface 1c is inclined. Table 1 shows the results of comparison with the case where the slits 2a were formed on the lead sheet 2 by using and were developed.

[Table 1] In Table 1, the breaking rate on the high angle side is shown for the conventional example in which the inclination angle of the gap surface 1c is 0 ° and for each example in which the inclination angle is 1 °, 3 °, 5 °, 8 ° and 10 °. The fracture rate on the low angle side and the life performance of lead acid batteries were compared. That is, the lead sheet 2 is processed into a grid using a rotary expander using the respective disc cutters 1, and the grid is filled with an active material, and then aged and dried to form a positive electrode plate. A lead storage battery for an automobile was prepared by combining a negative electrode plate manufactured by a conventional method and a separator mainly composed of microporous polyethylene with the positive electrode plate. Then, a light load life test according to JIS standard (D5301) was carried out on this lead acid battery in the gas phase at 75 ° C, and after the end of this life test, the battery was disassembled and the high angle side of the knotted portion 2b in the lattice body. And the ratio of the breakage points on the low angle side was investigated.

From the comparison results shown in Table 1, in the conventional example, the fracture rate on the high angle side is high, whereas in the example, the fracture rate on the low angle side is somewhat high as the inclination angle is increased. It was found that the rupture rate on the high angle side decreases rapidly, so that the rupture rates of both decrease with increasing inclination angle. It was also found that, along with this, the 75 ° CSAE life performance was also improved as the tilt angle increased until the tilt angle reached a certain size.

[0033]

As is apparent from the above description, according to the lead-acid battery manufacturing method and apparatus of the present invention, the gap surface between the convex portions of the disk cutter is inclined toward the center toward the front side. Therefore, the bending angle between the steep slope of the convex portion adjacent to the rear side can be increased and eased. Therefore, when the slits are formed in the lead sheet, the knots are inclined, and the steep rising angle at which the fence-shaped portions between the slits project in a mountain shape can be made gentle. It becomes possible to prevent susceptibility to erosion by the liquid, and to prevent reduction in capacity and shortening of life of the lead storage battery.

[Brief description of drawings]

FIG. 1 is a partial enlarged front view showing an inclined gap surface of a disk cutter according to an embodiment of the present invention.

FIG. 2 shows an embodiment of the present invention, and is a partially enlarged vertical sectional front view showing a fence-shaped portion between slits protruding in a chevron shape in the lead sheet.

FIG. 3 shows a conventional example and is a front view showing a disc cutter.

FIG. 4 is a partially enlarged front view showing a conventional example and showing a convex portion and a gap surface of a disk cutter.

FIG. 5 is a front view showing a conventional example and showing a step of forming a slit in a lead sheet by a disk cutter in a rotary expander.

FIG. 6 is a partially enlarged vertical cross-sectional side view showing an arrangement of rolls of a disc cutter in a rotary expander, showing a conventional example.

FIG. 7 shows a conventional example, and is a partially enlarged vertical sectional front view showing a fence-shaped portion between slits projecting in a mountain shape in a lead sheet.

FIG. 8 shows a conventional example and is a partially enlarged plan view of a lattice body formed by expanding slits of a lead sheet into squares.

[Explanation of symbols]

1 disk cutter 1a convex part 1b top 1c Gap surface 2 Lead sheet 2a slit

Claims (5)

[Claims] 1. A plurality of chevron-shaped projections whose tops are biased toward the front side in the direction of rotation at equal angular intervals spaced apart on a disk-shaped circumferential surface are provided so as to project toward the outer circumferential direction. The gap surface, which is the peripheral side surface between each convex portion, is inclined toward the center side toward the front side with respect to the contact surface that is in contact with the circumferential surface where all the contact surfaces in contact with this clearance surface have the same angular position at the center of the rotation axis. The grooves are formed on the surface and are formed at equal angular intervals on the peripheral portions of the disk-shaped both surfaces, and recesses are formed on every other gap surface and on both surfaces which are staggered. A method of manufacturing a lead storage battery, comprising forming a slit in which a knot portion is inclined on a lead sheet using a disk cutter of a rotary expander. 2. A plurality of chevron-shaped projections whose tops are biased toward the front side in the direction of rotation at equal angular intervals spaced apart on a disk-shaped circumferential surface are provided so as to project toward the outer peripheral direction, and Concave grooves that are formed in the peripheral portions of both disk-shaped surfaces at equal angular intervals, and that are open at alternate gap surfaces that are the peripheral side surfaces between the convex portions and that are staggered on both sides. In a lead-acid battery manufacturing device that manufactures a grid plate of polar plates by a rotary expander that forms a slit in a lead sheet using a disk cutter, each gap surface of the disk cutter is in contact with this gap surface. A lead-acid battery manufacturing apparatus, wherein all the contact surfaces are formed so as to be inclined toward the center side toward the front side with respect to the contact surface contacting the circumferential surface at the same angular position at the center of the rotation axis of the disk cutter. 3. The gap surface is closer to the center side by 1 ° or more toward the front side than the contact surface in which all the contact surfaces in contact with the clearance surface are in the same angular position at the center of the rotation axis of the disk cutter. It is formed in the inclined surface, The 1 or 2 characterized by the above-mentioned.
A method of manufacturing a lead storage battery or a device thereof. 4. A surface of the gap surface excluding the front end is more forward than a contact surface contacting a circumferential surface in which all contact surfaces contacting this surface are at the same angular position at the rotation axis center of the disk cutter. The lead storage battery manufacturing method or apparatus according to claim 1, wherein the lead storage battery is formed so as to be inclined toward the center toward the side. 5. A circumferential surface that serves as a reference for the inclination of the gap surface is a flat surface that connects between the intersecting lines of the circumferential surface and the slopes of the convex portions on both sides. , 3 or 4, the method of manufacturing a lead acid battery or the apparatus thereof.