JP3632238B2 - Method for manufacturing grid for lead-acid battery - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an improvement in a method for manufacturing a lead-acid battery grid.
[0002]
[Prior art]
In recent years, high performance and high electronics of automobiles are rapidly progressing, and as such a power source, a light-weight and long-life lead storage battery having excellent liquid reduction characteristics is desired. In order to satisfy these points, batteries using low antimony-based or calcium-based lead alloy grids are currently on the market. There are a casting method and an expanding method as a manufacturing method of these lattices. Generally, a calcium-based lead alloy lattice is produced by an expanding process with good productivity and low cost. And in order to use as a lattice body, this is shaped in the sheet | seat state.
[0003]
A typical method for forming (forming) the expanded lattice will be described below.
[0004]
Repeat the cutting operation of a lead alloy belt-like sheet with different blade edge shapes and a multi-blade cutter, and cut the lead alloy sheet from one side (upper surface) to the specified width sequentially from the outside to the inside of the sheet. Expand the lever part. Then, excluding the unprocessed portion of the expanded portion left for forming the ear portion at the center of the sheet, the expanded portion was shaped with a roller having a uniform diameter, and the width dimension was adjusted.
[0005]
[Problems to be solved by the invention]
However, when the Sn content in the lead alloy sheet was increased in order to improve the lattice strength and the corrosion resistance, the width dimension variation in the expanded portion after forming increased.
[0006]
As a result of examining the cause in detail, because the tensile strength of the lead alloy sheet increased, it took a lot of force when rolling the lattice bone intersection part of the mesh part so that the expanded part was subjected to the forming process with a shaping roller. It became clear that the direction became non-uniform and the mesh shape portion was kinked.
[0007]
The present invention is intended to solve the conventional problems described above, the width of the sheet by the time of the forming process of the expansion work sheet, rolling the expanding process portion to successively rolling degree outward decreases from the sheet central portion The purpose is to reduce the variation of
[0008]
[Means for Solving the Problems]
In order to achieve this object, the method of the present invention reduces the diameter sequentially from the center toward the end in the width direction, except for the unprocessed portion of the center portion where the shape of the forming roller used for forming processing is expanded . A forming process is performed using a workpiece .
[0009]
[Action]
By such a forming roller, rolling of the expanded sheet is performed sequentially or stepwise from near the center to the outer edge of the expanded sheet, thereby changing the degree of rolling at the lattice bone intersection in the sheet development portion, thereby causing variations in the width direction. Can be reduced to stabilize the quality.
[0010]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
In FIG. 1, 1 is an expanded lead alloy sheet substrate, 2 is a forming roller, and 3 is a table for shaping.
[0012]
The Pb-Ca alloy sheet containing Ca 0.07% and Sn 1.0% by weight ratio is expanded by a conventional method, and then subjected to forming with three rollers A, B, and C, and an expanded lattice of 10,000 m each. The body was manufactured. A is the maximum diameter in order to suppress the center unprocessed part in the expanding process, and the other parts are gradually reduced in diameter from the vicinity of the center of the roller toward both ends. B is the same as A, but with the roller diameters successively reduced in a conical shape rather than stepwise. C is a conventional forming roller in which the roller diameter is increased only in the central portion and the other portions have the same diameter in order to suppress the center unprocessed portion in the expanding process. After forming with each roller, the width of the molded product in the direction perpendicular to the direction of travel of the processed sheet was measured. When processed with the forming roller A of the present invention, the conventional product In comparison with FIG. 2, it is possible to reduce the variation as shown in FIG. B also showed almost the same variation as A.
[0013]
In addition, when several types of rollers were combined as a modification of A, and the expanded sheet was partially rolled only in its processed part, the width dimension variation after processing could be further reduced as shown in FIG. .
[0014]
Further, in order to improve the corrosion resistance and strength of the positive electrode grid, the amount of Sn in the lead alloy forming the sheet is increased. In particular, when the amount of Sn in the sheet alloy is 1.0% or more, As shown in FIG. 4, a remarkable effect of reducing the variation in sheet width was observed.
[0015]
【The invention's effect】
As described above, the present invention aims to stabilize the quality by reducing the width dimension variation of the expanded lattice, and has a great industrial value.
[Brief description of the drawings]
FIG. 1 is a diagram showing a sheet forming method after expansion processing. FIG. 2 is a diagram showing measurement results of width dimensions after forming with a conventional roller and a roller according to the present invention. Fig. 4 shows the measurement results of the width dimension after forming several stages in combination with various types of rollers. Fig. 4 shows the variation in the sheet width dimension due to the alloy composition of the lead sheet.
1 Sheet base material 2 Forming rollers 3

Claims (3)

The lead alloy sheet is expanded from the widthwise end portion toward the center portion, and the grid is manufactured. A method for producing a grid for a lead storage battery, wherein the sheet is rolled with a roller having a diameter that is gradually reduced toward an end in the width direction of the sheet. The method for producing a grid for a lead storage battery according to claim 1, wherein rolling is performed stepwise by a combination of several types of rollers . The lead-acid battery grid body according to claim 1 or 2, wherein the lead alloy sheet is a Pb-Ca-Sn-based alloy, and the Sn content is 1.0 wt% or more. Method.

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