JPH04274165A - Continuous casting apparatus for grid for lead-acid battery - Google Patents

Abstract

PURPOSE:To prevent a gate for molten metal supply from being choked up by solidifying substances of the molten metal to increase the number of cast products by forming a recessed part in the reverse direction side to the rotary direction of a rotary casting mold relative to the gate for molten metal supply. CONSTITUTION:A rotary casting mold 10 rotates in the direction of an arrow F around a driving shaft 11 as a center by a driving motor. A recessed part 7 is formed in the bottom wall part 20e of a molten metal supplying part 20 in the reverse direction to the rotary direction F of the casting mold 10 relative to a gate 50. The recessed part 7 is so formed as to open to a contacting surface 20f along the gate 50. The molten metal enters the recessed part 7 and solidifies inside and the recessed part prevents solidified substances 60 from moving. The solidified substances 60 are not conveyed to the gate 50 side and remain near the recessed part 7 even when the casting mold 10 rotates continuously. Consequently, molten lead alloy is prevented from flowing in the grooved part 10c which is in the reverse direction to the rotary direction F of the casting mold 10.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting apparatus for grid bodies for lead-acid batteries.

0002

2. Description of the Related Art A conventional continuous casting apparatus for lattice bodies for lead-acid batteries continuously manufactures lattice bodies using, for example, a rotary mold 1 and a molten metal supply section 2 shown in FIG. The rotary mold 1 includes a cylindrical or cylindrical mold body 1a that rotates around an axis (not shown) in the direction of the arrow F shown in the figure.
A carved portion 1c is formed on the outer circumferential surface 1b of a. Molten metal is supplied to this carved portion 1c from a molten metal supply section 2.

The molten metal supply section 2 includes a supply section main body 2a and a cover plate section 2b, and a molten metal supply path 3 is formed inside the supply section main body 2a closed by the cover plate section 2b. The supply section main body 2a extends along the outer peripheral surface of the rotary mold 1 and in the axial direction of the rotary mold 1, and a through hole is formed in each of the pair of side walls 2c and 2d of the supply section main body 2a. Molten metal supply pipes 4a and 4b connected to a molten metal supply source (not shown) are connected to the holes. The bottom wall portion 2e of the supply section main body 2a is provided with a curved contact surface 2f so as to come into contact with the outer circumferential surface 1b of the rotary mold 1, and the bottom wall portion 2e has a molten metal supply path that opens to the contact surface 2f. A molten metal supply sprue 5 (hereinafter referred to as sprue) communicating with molten metal 3 is formed. The sprue 5 extends along the axial direction of the rotary mold 1. One molten metal supply pipe 4 from a molten metal supply source (not shown)
The lead alloy molten metal supplied through b is filled into the molten metal supply path 3 constituting the molten metal reservoir. The molten metal is poured into sprue 5
The molten metal is continuously supplied to the carved part 1c of the rotary mold 1 at a predetermined pressure through the molten metal supply pipe 4a, and is returned to the molten metal supply source through the molten metal supply pipe 4a. A casting space is formed between the contact surface 3f of the molten metal supply part 2 and the bottom of the carved part 1c of the rotary mold 1, and the molten metal supplied to this casting space solidifies while the rotary mold 1 rotates. As a result, grid bodies are continuously cast.

0004

However, in the conventional continuous casting apparatus, a predetermined pressure is applied to the molten metal to form the molten metal from the sprue 5 between the contact surface 2f and the bottom of the carved part 1c of the rotating mold 1. In order to supply the lead alloy to the casting space, the molten lead alloy also flows into the casting space on the side opposite to the rotational direction of the rotary mold 1 (direction of arrow F) under the pressure. In order to continuously manufacture the lattice body, the carved portion 1c formed on the surface of the rotary mold 1 must include a carved portion that extends continuously in the circumferential direction of the rotary mold 1. Therefore, in the portion corresponding to the carved portion extending continuously in the circumferential direction, the molten lead alloy flowing in the opposite direction solidifies and eventually becomes the solidified material 6. As the solidified material 6 becomes larger, the contact resistance with the rotary mold 1 increases, and the solidified material 6 is gradually carried to the sprue 5 by the rotation of the rotary mold 1. As shown in FIG. 5, when the coagulated material 6 is transported to the sprue 5, it remains near the sprue 5 so as to block the sprue 5. Therefore, the supply of molten lead alloy from the sprue 5 to the carved portion 1c is partially obstructed by the solidified material 6, and it becomes necessary to remove the solidified material 6 at a relatively early stage, which reduces the number of lattice bodies that can be continuously cast. I couldn't increase it.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus that can solve the above problems and increase the number of grid bodies that can be continuously cast.

[0006]

[Means for Solving the Problems] The present invention will be described based on the embodiment shown in FIG. 1. The present invention includes a rotary mold 10 having a carved portion 10c extending continuously in the circumferential direction;
a contact surface 20f that contacts the outer circumferential surface 10b of the rotary mold 10;
A lead-acid battery comprising a molten metal supply gate 50 that opens to the contact surface and a molten metal supply section 20 that continuously supplies molten metal to the rotary mold 10 by having a molten metal supply path 30 that supplies molten metal to the molten metal supply gate 50. In order to improve the continuous casting apparatus for lattice bodies, in the present invention, a recess 7 is formed in the molten metal supply section 20 along the molten metal supply sprue 50 and opens to the contact surface 20f. This recess 7 is provided at a position opposite to the rotational direction of the rotary mold with respect to the molten metal supply sprue 50.

[0007]

[Operation] Molten metal is supplied to the recessed portion 7 provided at a position opposite to the rotating direction of the rotary mold 10 with respect to the sprue 50 for supplying the molten metal to the carved portion 10c continuous in the circumferential direction.
The molten metal that has flowed into the portion in the direction opposite to the rotational direction F of . Since the molten metal that has entered the recess 7 solidifies while entering the recess 7 , the solidified material 60 that has flowed into the position opposite to the rotational direction of the rotary mold 10 and solidified is caught in the recess 7 . Become. Therefore, the solidified material 60 remains near the recess 7 without being carried to the sprue 50 side, and does not block the molten metal supply sprue 50. In addition, the coagulated material 60
By remaining in the vicinity of the recess 7, the molten metal can be prevented from flowing in the direction opposite to the rotation direction F of the rotary mold 10 in the carved portion 10c that extends continuously in the circumferential direction.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view schematically showing the main parts of the continuous casting apparatus of the present invention, and FIG. 2 is an enlarged sectional view of the vicinity of the molten metal supply section of the continuous casting apparatus of the present invention. For the same parts as the conventional device shown in Fig. 4, the numbers shown in Fig. 4 are changed to 1
A sign indicating that the value has been multiplied by 0 is given. Reference numeral 10 denotes a temperature-adjustable rotary mold made of stainless steel, and this rotary mold 10 is rotated in the direction of arrow F around a drive shaft 11 by a drive motor (not shown). A carved portion forming a lattice is formed on the outer circumferential surface 10b of the rotary mold 10, and this carved portion includes at least one carved portion 10c continuous in the circumferential direction. The molten metal supply section 20 is equipped with an appropriate heating means (not shown) that can heat the molten lead alloy as needed, in order to facilitate circulation of the molten lead alloy. Further, the molten metal supply section 20 is disposed directly above the rotary mold 10, and is urged against the rotary mold 10 using a spring means (not shown) so as to come into close contact with the rotary mold 10. Molten metal supply section 2
The rotary mold 10 is placed on the bottom wall portion 20e of
A recess 7 is formed in a portion opposite to the rotation direction. This recess 7 is formed along the sprue 50 so as to open to the contact surface 20f. Although the recess 7 in this embodiment extends continuously along the sprue 50, it is sufficient that the recess 7 is provided corresponding to at least the carved portion 10c that extends continuously in the circumferential direction. Further, the shape of the recess 7 may be arbitrary as long as the molten metal can enter and solidify inside and prevent the solidified material 60 from moving. 12 is a scraper for stripping off the molded lattice body 13 from the rotary mold 10. During continuous casting, when molten lead alloy flows into the part of the carved part 10c on the side opposite to the rotational direction F of the rotary mold 10, this molten lead alloy flows into the recess 7 provided in the molten metal supply part 20. flow inside. When the molten lead alloy solidifies in this state, the solidified material 60 shown in FIG.
A part of the molten lead alloy solidifies in the recess 7 as shown in FIG. The solidified material 60 thus solidified remains near the recess 7 without being carried toward the sprue 50 even when the rotary mold 10 rotates continuously. Further, since the solidified material 6 remains near the recess 7, it is also possible to prevent the molten lead alloy from flowing into the carved portion 10c on the side opposite to the rotation direction F of the rotary mold 10.

Next, the dimensions of each part in the specific example used in the test will be explained.

[0011] In the test, a rotary mold with dimensions of 300 mm in diameter and 91 mm in width was used, and the outer peripheral surface of the rotary mold 10 had a length of 1
An engraved portion is formed that can produce eight lattice bodies each measuring 22 mm in width, 56 mm in width, 10 mm in ear length, and 10 mm in ear width. The sprue 50 has dimensions of 8 mm in length in the circumferential direction and 60 mm in width in the axial direction. The length is 60 mm. The recess 7 has a circumferential length of 5 mm, an axial width of 60 mm, and a depth of 5 m.
5 m in the circumferential direction from the sprue 50.
They are provided at intervals of m.

FIG. 4 shows the device of this embodiment and the structure in which the recess 7 is not formed.
Pb-1.5Sb alloy was cast for 10 minutes under the conditions of hot water supply temperature of 550°C, mold temperature of 120°C, and mold rotation speed of 20 rpm using the conventional equipment shown in were investigated respectively. With conventional equipment, hot water ran out (sprue blockage) occurred during casting, and only about 150 lattice bodies could be obtained. On the other hand, when the apparatus of the present invention was used, about 1,600 grids could be obtained without running out of hot water (sprue blockage) even once.

[0013]

[Effects of the Invention] According to the continuous casting apparatus of the present invention, since the recess is provided at a position opposite to the rotational direction of the rotary mold with respect to the molten metal supply sprue, the concave portion is provided at a position opposite to the rotational direction of the rotary mold. The solidified material that has flowed into the position on the direction side can be caught and fixed in this recess, thereby preventing movement of the solidified material and preventing the sprue from being blocked by the solidified material. Furthermore, since the solidified material remains near the recess, it is possible to prevent the molten metal from flowing into the carved part that extends continuously in the circumferential direction in the direction opposite to the rotation direction of the rotary mold.

[Brief explanation of the drawing]

FIG. 1 is a sectional view schematically showing a continuous casting apparatus of the present invention.

FIG. 2 is an enlarged partial sectional view of the vicinity of the molten metal supply section of the continuous casting apparatus of the present invention.

FIG. 3 is a partial cross-sectional view showing how solidified matter remains in the vicinity of the recess.

FIG. 4 is a partial cross-sectional view showing a structure near a molten metal supply section of a conventional continuous casting apparatus.

FIG. 5 is a partial cross-sectional view showing solidified matter remaining near the sprue of a conventional continuous casting apparatus.

[Explanation of symbols]

1,10 Rotary mold 1b, 10b outer peripheral surface 1c, 10c carved part 2,20 Molten metal supply section 2f, 20f Contact surface 3,30 Molten metal supply path 5,50 Sprue 6,60　　　　　Coagulate 7　　　　　　　　　　Concavity

Claims (1)

[Claims] 1. A rotary mold having a carved part continuous in the circumferential direction, a contact surface that contacts the outer circumferential surface of the rotary mold, a molten metal supply sprue that opens in the contact surface, and a molten metal supply sprue that supplies the molten metal to the molten metal supply sprue. and a molten metal supply section that continuously supplies molten metal to the rotary mold, the molten metal supply section having a molten metal supply channel connected to the molten metal supply gate. A recessed portion opening to the contact surface along the line is formed, and the recessed portion is provided at a position opposite to the rotational direction of the rotary mold with respect to the molten metal supply gate. Continuous casting equipment for lattice bodies.