JPH0318307B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously manufacturing an expanded lattice for lead-acid batteries, and is particularly intended to improve the productivity and yield of the lattice and reduce manufacturing costs.

Conventionally, in mass production of expanded grid bodies for lead-acid batteries, as shown in Fig. 1, lead or lead alloy molten metal a is continuously transferred from a melting furnace or holding furnace 1 to a tundish 2, and the molten metal a is held in the tundish 2. Then, the molten metal is poured from the tundish 2 through a nozzle 3 between a pair of forcibly cooled metal rolls 4a and 4b that rotate smoothly in the direction of the arrow, and the molten metal a is cooled and solidified on the outer peripheral surfaces of the rolls 4a and 4b, and then rolled. to continuously form strips or plates b of a predetermined size.

This is successively passed through a slitter 5 and a shaping machine 6 to slit the strips or plates b to a required width to form thin strips and improve the flatness, which is then wound around a coiler 7a. Next, as shown in FIG. 2, the wound coil is attached to an uncoiler 7b to be uncoiled, passed through an expander 8 and processed into an expanded lattice body, which is then cut into a predetermined length by a cutter 9. In the figure, numeral 10 indicates a conveyor for transporting the lattice body, and numeral 11 indicates a guide roll.

In such a continuous manufacturing method, a strip or plate is continuously slitted to improve its flatness and then wound around a coiler.
The grid is then processed at room temperature in order to be attached to an uncoiler and passed through an expander. As a result, the strips had poor toughness, and therefore the lattice spacing was likely to be irregular, resulting in a high rate of defective products.
Therefore, in the past, there was a problem that the manufacturing yield of the lattice body was poor. In addition, since the coil is wound on a coiler, transferred, and attached to an uncoiler, the manufacturing process is complicated, which causes an increase in manufacturing costs.

In view of this, as a result of various studies, the present invention has found that the workability of the lattice body is improved by warm expanding processing, which improves the manufacturing yield, and that the strips can be continuously expanded without being wound up on a coiler. It was discovered that warm processing of the lattice body can be facilitated by passing it through an expander, and the number of manufacturing steps can be reduced.As a result of further study, the productivity and yield of the lattice body can be improved, and the manufacturing cost can be reduced. As shown in Figure 3, this method has developed a method for continuous casting of expanded grid bodies for lead-acid batteries that can reduce the amount of lead-acid batteries. The tundish 2 has a nozzle 3, and the molten metal a is then transferred from the nozzle 3 to a pair of metal rolls 4.
The metal rolls 4a, 4b are poured by pouring the metal between the metal rolls 4a, 4b.
The strip or plate b is then cooled and solidified and rolled into a high-temperature strip or plate b.The strip or plate b is then formed into a plurality of strips by a slitter 5b, which is equipped with a shaping machine, and then naturally cooled. Alternatively, the strip is brought to a predetermined temperature by forced cooling or heating, then warm-processed by an expander 8 to form a continuous expanded lattice body, and then the continuous expanded lattice body is cut into a predetermined size by a cutting machine 9. That is.

That is, as shown in FIG. 3, the present invention transfers lead or lead alloy molten metal a from a melting furnace or holding furnace 1 to a tundish 2, holds the molten metal a in the tundish 2, and passes it through a nozzle 3 of the tundish 2 in the direction of the arrow. The molten metal a is poured between a pair of forcedly cooled metal rolls 4a and 4b that rotate smoothly.
It is cooled and solidified on the outer peripheral surfaces of a and 4b and rolled to continuously form a strip or plate b of a predetermined size.
This is passed through a slitter 5a to cut both sides of the strip or plate b to finish it into a predetermined width, then passed through a shaping machine 6 to be reshaped, and then passed through a slitter 5b again to be slitted into multiple strips of a predetermined width. . Each of these is passed through an expander 8 to be warm-processed into an expanded lattice body, and then this lattice body is cut into a predetermined length by a cutting machine 9. In the figure, numeral 10 indicates a conveyor for transporting the lattice body, and numeral 11 indicates a guide roll.

The present invention continuously manufactures an expanded lattice body for lead-acid batteries through the above-described manufacturing process, in which it is directly formed into strips or plates from molten metal online, and is then continuously slitted, shaped, etc.
The reason why the expanded lattice body is processed by sequentially performing the expander process or the shaping process, slitting process, and expanding process is to economically produce the expanded lattice body by warm working. That is, although the temperature of the rolled strip or plate decreases as the strip or plate is cooled by the metal rolls 4a and 4b, it is still relatively high, and the temperature increases when the strip or plate passes through the expander. is also maintained. Therefore, the strip or plate is processed into an expanded lattice body by an expander in a temperature state where the toughness is high, and the lattice spacing is uniformly expanded, so that shape defects are significantly reduced. In addition, since the process is carried out online, winding and uncoiling of the strips is omitted, simplifying the manufacturing process and improving productivity, which makes it possible to reduce manufacturing costs as well as improve the yield.

According to the present invention, since the strips supplied to the expander are manufactured by a direct rolling method, the strips have a uniform recrystallized structure and are high in toughness, and almost no cracks or the like occur due to the expanding process. Therefore, it is desirable that the warm working temperature be between 60 and 140°C; temperatures below 60°C may result in insufficient toughness and uneven lattice spacing.
If the temperature exceeds ℃, the rotary module inside the expander machine may seize. Generally, the temperature of strips or plates formed directly from molten metal is 160 to 100℃.
and 10 to 30 by the time you reach the expander
A temperature drop of ℃ is observed. Therefore, in order to maintain the strip passing through the expander at the desired temperature,
It is preferable to provide a cooling device as a pre-process of the expander, and in some cases, a heating device.

The present invention will be described below with reference to Examples.

Example 1 In the method of the present invention shown in Fig. 3, water-cooled copper rolls with a diameter of 800 mm are used as a pair of rotating metal rolls, and an S bridle is used as a shaping machine, and a width of 340 mm is formed by a pair of metal rolls. 0.7mm thick Pb−
A 0.1% Ca-0.5% Sn alloy strip was produced at a speed of 40 m/min, 10 mm of both sides of the strip were removed using a slitter, and then straightened using an S bridle. Next, use a slitter to divide it into four strips with a width of 80 mm.
This was sent to four expanders and continuously processed into an expanded lattice body, which was cut into lengths of 190 mm using a cutter and transported by a conveyor.

The temperature of the strips inside the expander is 80℃, there is no seizure of the rotary module, the lattice spacing is uniformly expanded, and the yield rate is 99%.
It was hot. This method has a much better yield than the conventional method shown in Figures 1 and 2, which has a good product rate of 94%, and also eliminates the need for two coilers and one uncoiler, compared to the conventional method. Two operating personnel were sufficient, compared to the three operating personnel of the conventional method.

Example 2 In the method of the present invention shown in FIG.
The slitter at the rear of the bridle is omitted, and the slitter at the front of the S bridle doubles as the slitter on both sides and the dividing slitter, and a Pb-2.3%Sb alloy strip with a width of 340 mm and a thickness of 0.7 mm is produced using a pair of metal rolls. was produced at a speed of 55 m/min, and 10 mm on both sides of the strip was removed using a slitter, and the strip was divided into four strips with a width of 80 mm. This was straightened using an S bridle and sent to four expanders, where it was continuously processed into an expanded lattice body, which was then cut into lengths of 190 mm using a cutter and transported by a conveyor.

The temperature of the strips inside the expander is 110℃.
No seizure was observed on the rotary module.
The lattice spacing is uniformly expanded, and the yield rate is 99%.
It was %. This method has a much better yield than the conventional method shown in Figures 1 and 2, which has a good product rate of 94%, and also eliminates the need for two coilers and one uncoiler compared to the conventional method. In contrast to the three operating personnel required in the conventional method, two operating personnel were sufficient.

As described above, the present invention improves the productivity and yield of expanded grid bodies for lead-acid batteries, such as improving the workability of expanding and simplifying the manufacturing process by omitting the winding and uncoiling of strips. ,
This has effects such as reducing manufacturing costs.

[Brief explanation of the drawing]

Figures 1 and 2 show an example of the conventional method. Figure 1 is an explanatory diagram showing the manufacturing process of strips, Figure 2 is an explanatory diagram showing the manufacturing process of expanded lattice bodies, and Figure 3 is an explanatory diagram showing the manufacturing process of expanded lattice bodies. FIG. 2 is an explanatory diagram showing an embodiment of the method of the present invention. a...molten metal, b...strip or plate, 1...holding furnace,
2... Tandaishi, 3... Nozzle, 4a, 4
b... Metal roll, 5, 5a, 5b... Slitter, 6... Shaping machine, 7a... Coiler, 7b...
...Uncoiler, 8...Expander, 9...
Cutting machine, 10... conveyor, 11... guide roll.

Claims (1)

[Claims] 1. Lead or lead alloy molten water a in the melting furnace or holding furnace 1
The tundish 2 is equipped with a nozzle 3, and the molten metal a is poured from the nozzle 3 between a pair of metal rolls 4a and 4b to form the metal. roll 4
A and 4b are cooled and solidified and rolled into a high-temperature strip or plate b, and then the strip or plate b is formed into a plurality of strips by a slitter 5b, and the slitter 5b
is equipped with a shaping machine, and then the strips, which have been brought to a predetermined temperature by natural cooling or forced cooling or heating, are warm-processed by an expander 8 to form a continuous expanded lattice body, and then a continuous expanded lattice body. A continuous manufacturing method for an expanded lattice body for a lead-acid battery, characterized in that the expanded lattice body is cut into predetermined dimensions by a cutting machine 9. 2. The continuous manufacturing method of expanded lattice bodies for lead-acid batteries according to claim 1, characterized in that the temperature of the strips during warm processing with an expander is 60 to 140°C.