JPH06312244A - Device for continuously casting lead battery grid body - Google Patents

Abstract

PURPOSE:To stably provide a grid body having high quality by arranging molten metal pouring holes having the same number as the number of carved cross- pieces in the grid body so that a slit opposite a carved cross-piece having the larger cross sectional area of the carving part is arranged so as to make the distance from the slit to the tip part of a shoe in the rotating direction of a drum longer. CONSTITUTION:The molten metal is continuously supplied into the carving part 3 on the surface of the rotated cylindrical mold (drum) 1 and solidified to form the grid body. Then, the (number of) pouring ports (slits) 630, 631, 632 in the shoe 11 for supplying the molten metal is made the same as the number of carved cross-pieces in the grid body. The slit is arranged so that the slits 631, 632 opposite the carved cross-pieces having the larger cross sectional area of the carving part is arranged so as to make the distance from the slit to the tip part of the shoe 11 in the rotating direction of the drum 1 longer. By this method, the burr and the crack defect are eliminated and the casting velocity is improved, and the grid body having high reliability can be provided with the continuous casting at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for continuously casting a lead storage battery grid body which supplies a grid body of inexpensive and stable quality.

[0002]

2. Description of the Related Art Lead acid battery plate grids for automobiles have been produced for a long time by using a so-called book mold type casting machine. In this method, the molten lead alloy is cast into a mold consisting of two cast iron blocks with engravings that are half the thickness of the lattice. Since it is a type of production system, productivity is not always good. Therefore, an attempt was made to develop a method for producing a lattice with higher productivity, and the expanded method was put to practical use for about 10 years.
According to this method, the plate manufacturing process can be made continuous from the production of the grid to the filling of the power generation material and the drying, and it is expected that not only the productivity but also the plate quality will be greatly improved. However, the expanding method also has a major drawback. That is, the degree of freedom in the lattice design is significantly smaller than that in the casting method. This is a great problem for lead acid batteries for automobiles, which are required to have high performance, but it is extremely difficult to solve because it is due to the essence of the expanding process.

By the way, as a method having a high productivity and a degree of freedom in terms of design, a lattice body manufacturing technique by a continuous casting method has been recently developed. For example, it is disclosed in Japanese Patent Publication No. 58-37057.
That is, as shown in FIG. 2, a rotating drum 1 having an engraving 3 corresponding to the shape of a lattice on its outer peripheral surface 2.
In addition, it is a molten metal supply device and has a structure in which a shoe 4 having a function of preventing the molten metal supplied to the engraving 3 from leaking from the engraving 3 until it solidifies is in contact with the drum 1 and the shoe 4. The grid body 5 formed by continuously solidifying the molten lead alloy is taken out in the form of a belt.

[0004]

The continuous casting method described above is capable of producing a lattice body at a casting speed of, for example, about 30 m / min, and although the productivity is about the same as that of the expanding method, it is produced. There is a considerable problem with the quality of the grid.

That is, the structure of the pouring port 6 for supplying the molten metal to the engraving on the drum surface as shown in Japanese Patent Publication No. 58-37057 is as shown in FIG. Has become.

First, the pouring port 6 is provided with a shoe 4 in order to supply the molten metal in addition to the engraved portion for forming the lattice.
The so-called flash 7 is apt to occur although it is scraped off by. The burr 7 hinders the filling of the paste serving as the power generation material, and a portion where the grid and the paste are difficult to adhere easily occurs.
Further, the generation of the burr 7 causes the weight of the lattice to vary, which makes it difficult to supply a battery of stable quality.

Secondly, the engraving 3 that has progressed directly below the pouring port 6 with the rotation of the drum 1 is filled with the molten metal almost at the same time. At this time, engraving with different cross-sectional areas, for example, as shown in FIG. Frame bones 31, 32 as shown
Since the cross-sections 310, 320, and 300 of the inner transverse bone 30 have different areas, the solidification time is not uniform, and as a result, cracking defects are likely to occur in the final solidified portion. But,
Regarding these problems, the above-mentioned publicly known example does not describe any concrete measures. The problem to be solved by the present invention is to provide a cheap and highly reliable lattice body by continuous casting, which improves burrs, crack defects and casting speed.

[0008]

In order to solve the above-mentioned problems, a shoe of a lead-acid battery lattice continuous casting apparatus according to the present invention has a pouring port (slit) of the shoe for supplying the molten metal.
Is the same number as the number of engraved lattice horizontal bones, and the slits facing the larger engraved cross-sectional area on the left are arranged so that the distance from the slits to the shoe tip in the drum rotation direction becomes longer. Characterize.

[0009]

It is possible to provide a grid body with minute flash and cracks by high-speed continuous casting, and to supply a highly reliable lead storage battery.

[0010]

EXAMPLES Next, examples of the present invention will be described. Figure 1
The structure of the shoe and the mold for continuous casting of the lead storage battery grid of the present invention is shown in FIG. The outer diameter of the drum is 413 mm and the width is 220
mm, the material is FCD350, and the surface is engraved with a lattice shape as shown in FIG. The cross-sectional areas of the cross-section 320 are 2.1 mm ² and the cross-section 300 is 0.
7 mm ² and the cross section 310 is 2.9 mm ² . The outer shape of the shoe 11 is made of aluminum bronze whose contact portion with the drum has a length of 120 mm in the circumferential direction. Each of the pouring ports provided on the shoe 11 has a pouring port 631 facing the frame bone 31 with a width of 2.0 mm and a length of 10 mm, and a pouring port 632 facing the frame bone 32 with a width of 1.5 mm and a length of 10 mm. The pouring port 630 facing the inner transverse bone 30 other than the frame bone has a width of 1.0 mm,
Each of them has a length of 10 mm and is almost rectangular. The position of each pouring spout on the circumference of the drum is
31 is 70 mm from the tip of the shoe, pouring port 632 is 60 mm from the tip of the shoe, pouring port 630 is 45 from the tip of the shoe.
mm. On the other hand, FIG. 3 and FIG. 5 show the structures of a conventional lead-acid battery grid continuous casting shoe and mold. The outer diameter and the like of the drum are the same as those of FIG. 1 in both cases, but the pouring ports 630, 631, 632 provided in the shoe 11 of FIG.
All positions on the drum circumference are 70m from the tip of the shoe.
m, the pouring port 6 provided on the shoe 11 of FIG. 3 has a width of 1
The shape is nearly rectangular with a length of 15 mm and a length of 10 mm, and is located 70 mm from the tip of the shoe.

A lattice body was cast under the conditions of a molten metal temperature of 480 ° C., a mold temperature of 130 ° C., a mold rotation speed of 25 rpm, and a molten alloy composition of Pb-1.3Sb, using a lattice continuous casting apparatus using the above shoe. As a result, in the continuous casting apparatus using the shoe having the conventional structure shown in FIG. 3, burrs as shown in FIG. 3 were found in all the lattice bodies, and crack defects were recognized in about 15% of the lattice bodies. Was given. Further, in the case of the continuous casting apparatus using the shoe having the structure shown in FIG. 5, the occurrence of burrs was suppressed, but the crack defects could not be suppressed. On the other hand, in the continuous casting apparatus using the shoe having the structure according to the present invention shown in FIG. 1, there was no occurrence of flash, and the occurrence rate of crack defects was as small as 0.5% or less.

[0012]

As described above, the lead-acid battery grid continuous casting apparatus according to the present invention can supply a stable grid of high quality, and the effect is industrially great.

[Brief description of drawings]

FIG. 1 is an explanatory view of a shoe and a mold for a lead-acid battery grid continuous casting apparatus according to the present invention.

FIG. 2 is an explanatory view of a conventional lead storage battery grid continuous casting machine.

FIG. 3 is an explanatory view of a shoe for a conventional lead storage battery grid continuous casting device and a casting defect.

FIG. 4 is a supplementary explanatory diagram of the present embodiment.

FIG. 5 is a supplementary explanatory diagram of the present embodiment.

[Explanation of symbols]

1 is a drum, 3 is an engraved lattice, 11 is a shoe, 63
0 is the pouring spout, 631 is the pouring spout, and 632 is the pouring spout

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshio Uchida 832-2 Horiguchi, Katsuta-shi, Ibaraki Hitachi, Ltd. Hitachi Research Laboratory Ltd. (72) Toshinori Dozono 832-2, Horiguchi, Katsuta-shi, Ibaraki Hitachi Ltd. Hitachi Research Laboratory

Claims (1)

[Claims] 1. A casting apparatus for forming a lattice by continuously supplying molten metal to the engraving of the surface of a rotating cylindrical mold (drum) and solidifying the molten metal, and using the molten metal. Supply pouring spout (slit)
Is the same number as the number of engraved lattice horizontal bones, and the slits facing the larger engraved cross-sectional area on the left are arranged so that the distance from the slits to the shoe tip in the drum rotation direction becomes longer. Characteristic Lead-acid battery grid continuous casting equipment.