JPH09323153A - Device for continuously casting current collecting grid body for lead battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously cast a current collecting grid body having good quality without crack in boundaries by forming a wide width part having the width length of a lower part framed skelton forming groove at longer than the width length in the rotating direction of a foot part forming recessed part and wider width than the groove width at the position where the lower part formed skelton forming groove does not connect with the foot part forming recessed part. SOLUTION: At the time of supplying molten lead into a molten metal supplying part at a prescribed pressure through a tube while rotating a rotary drum mold 1 with a driving device, the molten lead at the prescribed pressure is flowed into the forming grooves 10a-10b in the vertical direction parallel lined in the axial direction of the rotary drum mold 1 corresponding to each sprue through an opening recessed part from each sprue 20a-20b. Thus, the molten lead surely flowed into each forming groove 10a-10b is simultaneously flowed in the forming grooves 10d-10e in the horizontal direction extended in the axial direction of the rotary drum mold 1, ear part forming recessed part 10g and the foot part forming recessed part 10h. In such a way, the molten lead flowed in the whole body of each grid body forming part 10, is cooled on the rotary drum 1 surface and solidified and continuously cast.

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 current collecting grid for a lead battery.

[0002]

2. Description of the Related Art Conventionally, an apparatus for continuously casting a current collecting grid for a lead battery using a rotary drum mold and a molten metal supply unit is known. In the apparatus, the rotary drum mold is formed by engraving a plurality of grid body forming portions for continuously casting a current collecting grid body around the entire outer peripheral surface thereof, while the molten metal supply portion is formed on the inner surface thereof. Is curved so as to match the outer peripheral surface of the rotary drum mold, and a gate is provided at the center of the inner surface of the rotary drum mold to supply the molten lead to the grid body forming part. Is installed in a state in which the curved inner surface of the molten metal supply part is in sliding contact with the rotating drum mold, while at the same time the lead molten metal is rotated from the melt inlet of the molten metal supply part to the outer peripheral surface of the rotating drum mold at a required pressure. Supplying and continuously flowing into each grid body forming section, casting each current collecting grid body between the rotary drum mold and the molten metal supply section, the current collecting grid thus continuously cast As the rotary drum mold rotates, the body is guided from its outer peripheral surface through guide rollers. It is continuously cast as a strip composed of a series of current collector grid away peel. After that, this continuously cast current collecting grid body is filled with an active material paste and cut into a predetermined width to be used as a lead storage battery electrode plate. During operation of this apparatus, the inner peripheral surface of the molten metal supply section is fitted into the respective molding grooves formed in parallel with the outer peripheral surface of the rotary drum mold in the axial direction. The formed ridges serve to prevent the molten lead which has flowed into each forming groove from flowing in the direction opposite to the rotating direction of the rotary drum.

[0003]

However, although each of the ridges arranged in the above-mentioned conventional mold device serves as the above-mentioned preventive action, the upper frame bone molding for casting the upper frame bone of the lattice body is performed. Since the groove is formed by connecting to the outside of the ear molding recess for casting the ear, the molten lead discharged from the sprue flows into the entire surface of the ear molding recess and is cooled and solidified.
Along with the rotation of the rotary drum, it flows into the ear forming recess exposed from the lower surface of the ridge and is cooled and solidified. as a result,
As shown in FIG. 8, the cast current collecting grid body causes a crack K to occur at the boundary between the upper frame bone a of the frame bone A and the root of the ear portion B connected to the upper frame bone a, resulting in product loss. There was an inconvenience. Similar inconvenience may occur when continuously casting each current collecting grid body having a foot portion integrally with the lower frame of each current collecting grid body. That is, the current collecting grid cast by the casting apparatus having the lower frame bone forming groove for casting the lower frame bone and the foot forming concave portion extending outwardly from the lower frame bone has a lower portion as shown in FIG. It may occur at the boundary between the frame bone b and the root of the foot h.

[0004]

The present invention according to claim 1 provides a continuous casting method of a current collecting grid body for a lead storage battery, which solves the above-mentioned inconvenience caused by the above-mentioned conventional apparatus. A rotary drum mold in which a plurality of grid body molding parts for casting a current collecting grid body are continuously formed, and lead molten metal is in sliding contact with the outer peripheral surface of the rotary drum mold, and is continuous to the grid body molding part. A molten metal supply section for supplying the molten metal to the inner peripheral surface of the casing of the molten metal supply section, and the respective grooves formed in parallel with the outer peripheral surface of the rotary drum mold in the axial direction. In a continuous casting device for a lead-acid battery grid body, which is provided with protruding ridges to be fitted, an upper frame bone molding groove for casting the upper frame bone of the current collecting grid body of each grid body molding portion and an ear portion of the current collecting grid body The width of the upper frame bone molding groove at the connecting position with the ear molding recess for casting And the upper frame ossification groove has a length longer than the width in the direction of rotation of which is characterized in that formed on the wide portion having a width greater than the groove width of the places not concatenated with the ear portion forming the recess. According to a second aspect of the present invention, there is provided a rotary drum mold in which a plurality of grid body forming portions for casting a current collecting grid body are continuously formed on the entire outer peripheral surface, and a lead molten metal is slid on the outer peripheral surface of the rotary drum mold. The molten metal supply part is in contact with and continuously supplies to the grid forming part, and is parallel to the inner peripheral surface of the casing of the molten metal supply part to the outer peripheral surface of the rotary drum mold in the axial direction thereof. In a continuous casting apparatus for lead-acid battery grids, each of which is provided with a protrusion that fits in each of the formed grooves, a lower part for casting the lower frame of the current-collecting grid of each grid-formed part At the connecting position of the frame bone forming groove and the foot forming recess for casting the foot portion of the current collecting grid, the width of the lower frame bone forming groove is set to be longer than the width of the foot forming recess in the rotation direction. A wide width having a lower frame bone forming groove which is wider than a groove width of a portion which is not connected to the foot forming concave portion Continuous casting apparatus of the lead storage battery current collector grid, characterized in that formed on.

[0005]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a rotary casting mold 1 and a molten metal supply unit 2 for supplying a molten lead to the outer peripheral surface of the rotary drum 1 for cutting a part of a continuous casting apparatus for a lead-acid battery current collecting grid of the present invention. A side view is shown, and the outer peripheral surface 1a of the rotary drum mold 1 has a grid body forming portion 10 for continuously casting the current collecting grid body P shown in FIG.
A plurality of sheets are engraved so as to be continuous as shown in FIG. 1b shows a rotation axis.

Specifically, as shown in FIG. 3, each grid body forming portion 10 includes an upper frame bone a and a lower frame bone b which form a part of the outer peripheral frame bone of the current collecting grid body P. , 10a, 10b, 10c, 10 for forming a plurality of horizontal bones c, c, ...
c, ... Are engraved in parallel in the axial direction of the rotary drum mold 1 at a constant interval, and side frame bones d and e on the left and right of the outer peripheral frame bone of the current collecting grid body P, A forming groove 10 for casting a plurality of vertical bones f, f, ...
d, 10e and 10f, 10f, ...
In the circumferential direction, the grooves are formed in parallel at regular intervals, and further, in the molding groove 10a for casting the upper frame bone a, the ears g of the current collecting grid P are connected to the molding groove 10a. Molding groove 1 for engraving the ear molding recess 10g for casting the lower bone b and casting the lower bone b
0b is formed by engraving foot forming recesses 10h, 10h for casting two feet h, h of the current collecting grid P, which are connected to this, respectively. The lattice body forming portions 10, 10, ... Are arranged on the outer peripheral surface 1a of the rotary drum mold 1 over the entire peripheral surface thereof, and the lattice body forming portions 10, 10 adjacent to each other.
The molding grooves 10d and 10e are formed so as to be continuous. In the figure, n indicates an intermediate position between the adjacent lattice body forming portions 10, 10.

As shown in FIGS. 1 and 2, the molten metal supply part 2 is composed of a casing, and its inner surface 2a facing the peripheral surface of the rotary drum mold 1 matches the outer peripheral surface of the rotary drum mold 1. Is curved in an arc shape having a radius of curvature so that it extends in the width direction at the center of the curved inner surface,
That is, a rectangular opening recess 20 extending parallel to the axial direction of the rotary drum mold 1 is provided, and a tube 21 for penetrating the left and right side faces in the width direction of the housing to supply the molten lead is provided. Although not shown, this tube 21 has its both ends connected to a molten lead supply source, and the molten lead is supplied at a predetermined pressure by the operation of a supply pump that intervenes in the tube 21 from one open end. It was circulated so as to pass through 2 and return to the molten metal supply source from the other open end. The opening concave portion 20 and the tube 21 communicate with each other by opening the bottom surface of the opening concave portion 20 and the side surface of the tube 21 that faces the opening concave portion 20, and as shown by a chain line in FIG.
Gates 20a, 20c, 20c, ... 20b are provided at positions corresponding to the respective molding grooves 10a, 10c, 10c, ..., 10b arranged in parallel in the axial direction provided on the rotary drum mold 1. Further, the curved inner surface 2a of the molten metal supply portion 2 is provided in a surface area portion above the position of the opening concave portion 20 of the curved inner surface 2a.
In a state of slidingly contacting the outer peripheral surface of the rotary drum mold 1, they are fitted into the respective molding grooves 10a, 10c, 10c, ..., 10b arranged in parallel in the axial direction of the rotary drum mold 1, Forming grooves 10a, 10c, 10c, ..., 10b
Of the ridges 21a, 21 for preventing the lead molten metal supplied to the inside from solidifying by flowing in the direction opposite to the rotating direction.
21b are provided. The structure of the molten metal supply unit described above is the same as the conventional one.

According to the present invention, in the above continuous casting apparatus, in each grid body forming portion 10 engraved on the outer peripheral surface of the rotary drum mold 1, as shown in FIGS. Upper frame bone forming groove 10 for casting the upper frame bone a of the body P
a has a length L which is longer than the width W in the rotating direction of the rotary drum mold 1 of the ear forming recess 10g, that is, in the vertical direction in the drawing, at a position where it is connected to each ear forming recess 10g. In addition, it is characterized in that it is formed in a wide portion 10a 'having a width D wider than the groove width d of a portion of the upper frame bone forming groove 10a which is not connected to the ear portion forming recess 10g.

When the rotary drum mold 1 is rotated in the direction shown by the arrow in FIG. 1 by a driving device (not shown), and the lead molten metal is supplied to the molten metal supply portion 2 through the tube 21 at a predetermined pressure, the predetermined The pressure of the molten lead is 20a, 20c, 2
0b from 0c, ..., 20b into the molding grooves 10a, 10c, 10c, ..., 10b in the vertical direction, which are arranged in parallel with each other in the axial direction of the rotary drum mold 1 through the opening recesses 20, respectively. At this time, the inflowing lead melt is melted by the respective protrusions 21a, 21c, 21c, ... 21b.
Backflow is prevented. Thus, the lead molten metal that surely flows into the respective molding grooves 10a, 10c, 10c, ... 10b simultaneously forms lateral molding grooves 10d, 10f, 10f, ... 1 extending in the axial direction of the rotary drum mold 1.
0e and the ear forming recess 10g and the foot forming recess 10h, and thus the lead molten metal that has flowed into the whole of the lattice forming parts 10 is cooled by the surface of the rotary drum 1 and solidifies to be continuous. Is cast into.

Thus, according to the present invention, the wide portion 10
Since the length L of the a'is formed to be longer than the width w of the ear forming recess 10g, the lead molten metal discharged from the sprue 20a, as shown by the arrow in FIG. Prior to flowing in, the ridge 21a is heated while flowing into the wide portion 10a '. Thereafter, the lead molten metal is exposed from the lower surface of the ridge 21a as the rotary drum mold 1 rotates, and the upper frame bone forming recess 10a and the ear forming recess 10 are exposed.
However, since the ridge 21a is in a temperature rising state,
The lead molten metal that has flowed into the ear molding recess 10g is
Even if it comes into contact with 1a, it does not rapidly cool and solidify, but delays its solidification. Therefore, since the lead molten metal flowing into the upper frame bone forming recess 10a appearing from the lower surface of the ridge 21a comes into contact with the gradually solidified portion of the lead molten metal in the vicinity of the contact portion to cool and solidify these, A mutual fusion of the contacting boundaries is obtained. As a result, the upper frame bone a and the ear part g are cast without a crack, that is, a boundary line due to a difference in solidification time, and a favorable current collecting grid P shown in FIG. 5 is obtained. In this way, the rotation grid mold 1 is rotated and the lead melt is continuously supplied from the melt supply unit 2, whereby the current collecting grid body P is continuously and continuously cast.
Although not shown in the drawings, the outer peripheral surface is pulled and peeled off by a pulling device through a guide roller, and is continuously manufactured in a belt shape. After that, the band-shaped material is filled with the active material paste, and then cut along each cutting line n shown in FIG. 3 so that the current collecting grid P shown in FIG. 5 (the filled paste is not shown) is obtained. Many sheets are continuously manufactured. In the figure, a'is
A wide portion cast corresponding to the wide portion 10a 'is shown.

FIG. 6 is a development view of a main part of a rotary drum mold 1 similar to that shown in FIG. 3 of a continuous casting apparatus for a lead-acid battery current collecting grid according to another embodiment of the present invention. In this embodiment, on the peripheral surface of the rotary drum mold 1, the lower frame bone molding groove 10b is provided continuously with the foot molding concave portions 10h, and the foot molding concave portion 10g of the rotary drum mold 1 is provided. It has a length L'which is longer than the width W'in the rotational direction, that is, the vertical direction in the drawing, and is wider than the groove width d'of the lower frame bone forming groove 10 which is not connected to the foot forming recess 10h. The wide portion 10b 'having the wide width D is formed. By using this continuous casting apparatus, it is possible to obtain the heating effect of the lead melt flowing into the wide portion 10b 'by heating the projection 21b by the same action as in the previous embodiment. The ridge 21b is heated when the temperature of the lead molten metal that has flowed into the inside is increased.
Even if it contacts with, the rapid solidification is prevented and the gradual solidification occurs, and the lead molten metal which flows into the lower frame forming groove 10b appearing from the lower part of the ridge 21b and the gradual solidification portion near the contact portion is solidified. Since the solidified portion on the foot forming concave portion 10b side is fused with each other, as shown in FIG.
A current collecting grid body P having no cracks at the boundary between the foot portion h cast corresponding to 0b and the wide portion of the lower frame bone b'cast corresponding to the wide portion 10b 'is obtained.

[0012]

As described above, according to the present invention, the ear frame forming recess is connected to the upper frame bone forming groove of each of the plurality of lattice body forming parts continuously formed on the outer peripheral surface of the rotary drum mold. At the position where the upper frame bone and the lower frame bone are formed, or at the position where the lower frame bone forming groove is connected to the foot forming concave portion, the wide portions are respectively engraved. A good-quality current collector grid with no cracks at the boundary can be reliably continuously cast without manufacturing loss.

[Brief description of drawings]

FIG. 1 is a side view in which a part of a continuous casting apparatus for a current-collecting grid for a lead-acid battery according to one embodiment of the present invention is cut off.

FIG. 2 is a perspective view of a molten metal supply section.

FIG. 3 is a partial development view of an outer peripheral surface of a rotary drum mold.

FIG. 4 is an enlarged view of a main part of a current collecting grid body forming unit.

FIG. 5 is a front view of a current collecting grid body cast according to one example of the present invention.

FIG. 6 is a partial development view of an outer peripheral surface of a rotary drum mold of a continuous casting apparatus for a lead-acid battery current collecting grid according to another embodiment of the present invention.

FIG. 7 is a front view of a collector grid body cast according to another example of the present invention.

FIG. 8 is a front view of an example of a current collecting grid body manufactured by a conventional continuous casting apparatus.

[Explanation of symbols]

1 rotating drum mold 2 molten metal supply unit 1
0 Lattice body forming part 10a, 10b, 10c, 10d, 10e, 10f Forming groove 10a 'Wide part 10b' Wide part 1
0g Ear forming recess 21a, 21b, 21c Ridge D Wide width D'Wide width d d Groove width of other part of upper frame bone forming groove d'Groove width of other part of lower frame bone forming groove L Length of upper frame bone forming groove L'Length of lower frame bone forming groove W Width of ear forming concave portion in rotational direction W'Width of foot forming concave portion in rotational direction P P Current collector grid for lead acid battery

Claims (2)

[Claims] 1. A rotary drum mold having a plurality of grid body forming parts for casting a current collecting grid body continuous all around the outer peripheral surface, and lead molten metal is brought into sliding contact with the outer peripheral surface of the rotary drum mold, In addition, the molten metal supply unit continuously supplies to the grid forming unit, and is formed on the inner peripheral surface of the casing of the molten metal supply unit in parallel with the outer peripheral surface of the rotary drum mold in the axial direction. In a continuous casting apparatus for lead-acid battery grids, each of which is provided with a protrusion that fits into each of the formed grooves, upper frame bone molding for casting the upper frame bones of the current collecting grid body of each grid body forming part At the connecting position of the groove and the ear-forming concave portion for casting the ear of the current collecting grid,
The width of the upper frame bone forming groove is longer than the width of the ear part forming recess in the rotation direction, and is wider than the groove width at a portion where the upper frame bone forming groove is not connected to the ear part forming recess. A continuous casting apparatus for a current collecting grid body for a lead storage battery, characterized in that it is formed in a wide portion having 2. A rotary drum mold in which a plurality of grid body forming portions for casting a current collecting grid body are continuously engraved on the entire outer peripheral surface, and lead molten metal is brought into sliding contact with the outer peripheral surface of the rotary drum mold, In addition, the molten metal supply unit continuously supplies to the grid forming unit, and is formed on the inner peripheral surface of the casing of the molten metal supply unit in parallel with the outer peripheral surface of the rotary drum mold in the axial direction. In a continuous casting device for a lead-acid battery grid body, which comprises ridges to be fitted into the formed molding grooves, respectively, lower frame bone molding for casting the lower frame bone of the current collecting grid body of each grid body molding part At the connection position between the groove and the foot-forming recess for casting the foot of the current-collecting grid,
The width of the lower frame bone forming groove is longer than the width of the foot forming concave portion in the rotation direction, and is wider than the groove width at a portion where the lower frame bone forming groove is not connected to the foot forming concave portion. A continuous casting apparatus for a current collecting grid body for a lead storage battery, characterized in that it is formed in a wide portion having