JP2007167907A - Method for producing lead component for lead storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a lead component for a lead storage battery where molten metal supply/solidification/separation/releasing can be performed in a short time, and also, solidification as the air is entangled is hard to occur. <P>SOLUTION: Split molds A to D composed by stacking a plurality of plates, and in which the upper face of each plate is provided with a concave part 33 crossing a product part 32 are used. Further, a molten metal cover 41 composed of a sprue plate 43 having a sprue 42, and a molten metal cover plate 44 consisting of a central hole part 45a and a plurality of circumferential hole parts 45b is used. Then, the molten metal 15 of a lead alloy is supplied to the product part 32 in the lower split mold 31 through the circumferential hole part 45b along the wall face of the sprue 42 using a ladle 16 while being rotated, and is subjected to solidification/cutting/releasing, so as to produce a lead component for a lead storage battery. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a lead component for a lead storage battery.

  Lead-acid batteries are inexpensive and highly reliable batteries, and are used in various applications such as automobile batteries and uninterruptible power supplies. Among these lead storage batteries, control valve type lead storage batteries are characterized by the fact that they do not require refilling water, and therefore demand is increasing for applications such as uninterruptible power supplies.

  Conventionally, a relatively large control valve type lead-acid battery used in general has an internal structure as shown in FIG. And these comparatively large control valve type lead acid batteries are manufactured by group-welding the ears 9 of each electrode plate, inserting them into the battery case 4, and attaching the lid 5 as shown in FIG. (For example, refer to Patent Document 1).

  That is, as shown in FIG. 5, after laminating a plurality of positive plates 1 and negative plates 2 via separators 3 (not shown), the positive plates 1 and 2 are in the form of flat plates, respectively. The ear part 9 is sandwiched between the comb teeth 12.

  Next, in the state where various lead parts called lead part bars 14 and pole pole parts 18 having a substantially rectangular parallelepiped shape are placed on the comb teeth 12, the plasma welding apparatus 13, a burner (not shown), etc. Heat from above using. Then, these parts are melted and solidified, and welded and integrated to manufacture an electrode plate group having the pole column 8 and the strap 6. Here, it is known that when the plasma welding apparatus 13 is used for welding, the heating temperature and the heating position at the time of melting are easily controlled, and high-precision welding is possible.

  Then, as shown in FIG. 6, after the electrode plate group having the strap 6 and the pole column 8 is inserted into the resin battery case 4, a resin lid 5 is attached to the upper part thereof by a welding method or the like and sealed. Control valve type lead-acid batteries were manufactured.

  In addition, various lead parts called the lead part rod 14 and the pole pole part 18 use a pair of split molds 31 by a normal method, and a plurality of products by casting, for example, 3 in FIG. Individual products were manufactured (for example, see Patent Document 2). That is, as shown in FIG. 4, the copper core 11 is placed on the protruding copper core holder 22 of the bottom plate 21. As shown in FIG. 6, this copper core 11 is embedded in the terminal 7 at the tip of the pole 8 after completion of the battery, and is bolted by an external load (not shown) and a crimp terminal. Used to do.

  A pair of split molds 31 are placed on the bottom plate 21 (in FIG. 4, in order to facilitate the explanation of the product part 32, only the back half mold is shown, and the front half mold is omitted. The pair of split molds 31 are closed, and a hot water lid 41 is placed thereon. Then, the cork powder is sprayed in advance on the bottom plate 21, the split mold 31, and the hot water lid 41, and heated to about 250 ° C. with a heater.

  Then, the molten metal 15 of lead alloy heated to about 500 ° C. is poured by using the scissors 16 until the hot water 19 is formed from the gate 42 of the hot water lid 41 to supply hot water. Thereafter, after about 90 seconds have passed and the molten lead 15 has solidified, for example, as shown in FIG. The part with the hot water 19 was mechanically cut and separated, the split mold 31 was opened and released, and the three pole column parts 18 as products were taken out and manufactured. Note that the raw material of the portion of the hot metal 19 is heated and melted again and reused as the molten metal 15.

Japanese Patent Application No. 2004-167947 JP-A-7-132365

  However, when the conventional method for producing a lead component as described above is used, there is a problem in that the product part 32 may be solidified in a state where air is entrained during casting. That is, the molten lead alloy has a relatively high viscosity, needs to be hot-watered and solidified in a short time to shorten the manufacturing time, and the shape of the product part 32 of the split mold 31 is complicated. For this reason, when the molten metal 15 is poured from the firewood 16 to supply hot water, the molten lead alloy has solidified before the entrained air is completely discharged. If the product is solidified while air is entrained in the lead parts, the product has problems such as failure in the subsequent welding process, reduced strength of the product, and breakage due to corrosion. It was.

  The object of the present invention is to solve the above-described problems, and can enable hot water supply, solidification, separation, and mold release in a short time, and for lead-acid batteries that are less prone to solidification with air entrained during casting. It is providing the manufacturing method of lead parts.

  In order to solve the above-described problems, the present invention uses a split mold having a shape and a lid, and improves a method for supplying molten lead alloy to a gate of the lid.

That is, according to the first aspect of the present invention, a split mold having a product part and a water lid having a pouring gate are sequentially placed on the bottom plate, and a molten lead alloy is poured into the product part below from the pouring gate to supply the molten metal. In the manufacturing method for lead-acid battery lead parts manufactured by molding,
The split mold is configured by stacking a plurality of plates in the vertical direction, and has a recess crossing the product portion on one or both of the upper surface and the bottom surface of the plate, Hot water is supplied to the lower product part while rotating along the wall surface of the gate.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the cup is composed of a gate plate having a gate and a cup plate having a plurality of holes. .

  According to a third aspect of the present invention, in the first and second aspects of the present invention, the hole portion includes a central hole portion and a plurality of peripheral hole portions, and the molten metal is formed from the peripheral hole portion. Hot water is supplied to the product portion, and air is discharged upward from the central hole portion.

  By using the manufacturing method according to the present invention, it is possible to provide a method for manufacturing a lead-acid battery lead component that can enable hot water supply, solidification, separation, and mold release in a short time, and that does not easily solidify while being entrained with air. .

The method for producing a lead-acid battery lead component according to the present invention uses a split mold 31 and a water lid 41 that are characteristic in shape, as described later, and supplies hot water to the spout 42 of the water lid 41 of the molten lead 15 of the lead alloy. It is an improvement of the method. In the following, a method of manufacturing the pole column component 18 having a relatively complicated shape among the various lead components shown in FIG. 5 will be described in detail.
1. FIG. 1 shows a schematic diagram of a half mold structure of a split mold 31 according to the present invention. That is, the split mold 31 according to the present invention has a substantially rectangular parallelepiped shape, and is in a state in which a total of four plates of the split mold A31a to the split mold D31d that form the product portion 32 are stacked in the vertical direction, The bolts are not shown and are fixed to each other (FIG. 1 (a)). As shown in FIGS. 1 (a) and 1 (b), one or both of the upper surface or the bottom surface of each of the split molds A31a to D31d has a recess 33 for the purpose of venting air so as to cross the product section 32. Is provided. And even if they are stacked, the structure allows the air from the product part 32 to easily flow outside through the recess 33.

  For example, as shown in the split mold B31b (FIG. 1B), the upper surface of each split mold A31a to split mold D31d having a substantially rectangular parallelepiped shape is ventilated so as to cross the three product parts 32. The recess 33 having a target depth of about 0.07 mm is provided in the horizontal and vertical directions. As shown in FIG. 1B, on the upper surface of the split mold B31b having a substantially rectangular parallelepiped shape so as to cross the product portion 32, that is, in the horizontal direction (long side direction) and the vertical direction (perpendicular to the long side direction). In this direction, a recess 33 having a depth of about 0.07 mm, specifically 0.04 to 0.08 mm, is continuously provided. By narrowing the recess 33 to about 0.07 mm, the molten lead 15 does not ooze out of the split molds A31a to D31d when the hot water is supplied.

  As described above, the recesses 33 are formed on the upper surfaces of the split molds A31a to D31d, and even when they are stacked, a gap is formed by the recesses 33 of the split molds A31a to D31d. A part is formed. Through this gap, air can easily flow out from the product part 32 inside the split mold 31 toward the outside. As a result, as will be described later, when the molten metal 15 is supplied, air is easily discharged, and as a result, it is possible to provide a lead component for a lead storage battery that does not solidify while entraining the air.

As shown in FIG. 3, by adding a hot cycle of heated molten lead alloy 15 and heat cycles such as solidification / separation / release, split mold 31 composed of split mold A31a to split mold D31d. It became clear that "warping" occurred in Therefore, as shown in FIG. 3, the split mold 31 is fixed by using a bolt 34 and a pair of straightening plates 35 so that a force in the direction of the arrow is always applied so that the warp 31 does not warp. The structure was
2. 2 is a schematic view of the structure of the water lid 41 according to the present invention. That is, the cup 41 according to the present invention has a substantially rectangular parallelepiped shape, and is a state in which two pieces of a gate plate 43 having a burred 42 and a cup plate 44 having a plurality of holes 45 are stacked. And is fixed by using a bolt (not shown) (FIG. 2A).

  The spout plate 43 has a funnel shape with an inverted conical shape, and is formed with three spouts 42 with a digging to receive the molten lead 15 (FIG. 2B). Then, the molten lead 15 of the lead alloy is supplied from the outlet part of the gate 42 to the product part 32 of the split mold 31 in the downward direction through the lid plate 44. In the method of manufacturing a lead component according to the present invention, the molten lead 15 in the bowl 16 is moved along the wall surface of the gate 42 to the downward lid plate 44 while rotating as seen in a cyclone or the like. Hot water was supplied (FIG. 2B).

  On the other hand, in the lower lid plate 44, a plurality of holes 45 are formed at a position below the outlet of the gate 42 (FIG. 2 (c)). Then, as the hole 45, a central hole 45a and a plurality of peripheral holes 45b are formed so as to surround the hole 45a almost directly below the center of the outlet of the gate (FIG. 2 (c)). . That is, by providing a plurality of holes 45 in the hot water lid plate 44, the cross-sectional area of the runner is reduced.

  The molten lead alloy 15, which is heated while rotating along the side wall of the gate 42, is located below the gate 42, passes through the hole 45 in the lid plate 44 serving as a runner, and is split. Hot water is supplied to 31 product parts 32. Here, the lead alloy molten metal 15 supplied while rotating along the side wall surface of the gate 42 is a peripheral hole portion mainly as a runner among the plurality of hole portions 45 of the lid plate 44. Hot water is supplied from 45b to the product part 32 of the split mold 31. Then, the air entrained when the molten metal 15 is supplied to the product part 32 of the split mold 31 is made to be able to escape mainly from the central hole part 45a among the plurality of holes of the hole part 45.

  That is, by providing the central hole 45a in the hot water lid plate 44 and a plurality of peripheral hole parts 45b so as to surround it, the air entrained during the hot water supply of the molten metal 15 is easily upward from the central hole 45a. Can be discharged. Further, as described above, each of the split molds A31a to D31d is provided with the recess 33 for the purpose of venting air, and the air in the product part 32 is directed outward from the recess 33. Since it has a structure capable of flowing out, it is possible to discharge air entrained during hot water supply in a short time.

Further, the depth of the same shape as the above-mentioned split molds A to D31a-d on the bottom surface of the hot water lid plate 44, that is, the surface in contact with the split mold A31a is about 0.07 mm, more specifically 0.04 to A 0.08 mm recess 33 can also be provided continuously. Then, even when the recess 33 is not formed on the upper surface of the split mold A31a, it is possible to further facilitate the discharge of the air entrained when the molten metal 15 is supplied.
3. Method for Producing Lead-acid Battery Lead Component Among the various lead-acid battery lead components, a method for producing the pole pole component 18 will be described in detail with reference to FIGS. Various lead parts for lead-acid batteries are manufactured by a so-called gravity casting method.

  As shown in FIG. 4, a copper core 11 having a nut shape is put on a copper core stand 22 having a protruding shape of a bottom plate 21 in advance. As shown in FIG. 6, the copper core 11 is embedded in the terminal 7 after the battery is completed, and is used for bolt connection with an external load (not shown) and a crimp terminal. .

  A pair of split molds 31 each having a recess 33 are placed on the upper surface of the plate, which is composed of the four plates according to the present invention described above (the description of the shape of the product part 32 is easy). In order to do this, only the back half mold is shown, and the near half mold is omitted.). Next, the split mold 31 is closed, and a hot water lid 41 composed of the above-described gate plate 43 and the hot water lid plate 44 according to the present invention is placed thereon. Note that cork powder is sprayed on the steel base plate 21, split mold 31, and hot water lid 41 for the purpose of improving heat insulation and facilitating mold release work. Then, these bottom plate 21, split mold 31, and hot water lid 41 are heated in advance to about 250 ° C. with a heater.

  Then, the molten lead 15 heated to about 500 ° C. using the jar 16 is transferred from the gate 42 of the lid 41 to the lower lid plate 44 and the product portion 32 of the split mold 31 to the portion of the gate 42. It is poured and supplied until the feeder 19 is formed. Here, when the molten lead 15 of the lead alloy is supplied to the gate 42 of the lid 41, the molten lead 15 poured is rotated so that it can be seen along the wall surface of the gate 42 with a cyclone or the like. Then, hot water was supplied to the lower lid plate 44 (FIG. 2B).

  In this way, when the molten lead 15 of the lead alloy is heated while rotating along the wall surface of the gate 42, the molten metal 15 is mainly a peripheral hole 45b as a runner among the plurality of holes 45 of the lid plate 44. Can be poured into the product part 32 of the split mold 31 in the downward direction. The air entrained when the molten metal 15 is supplied to the product part 32 of the split mold 31 can be easily discharged upward from the central hole 45a among the plurality of holes 45. (Fig. 2 (c)). In addition, as described above, the recess 33 is provided in each of the split molds A31a to D31d. That is, since the structure is such that the air in the inner product portion 32 can flow out from the recess 33, the air entrained when the molten metal 15 is supplied can be easily discharged.

  Therefore, it is possible to provide a method for producing a lead component for a lead-acid battery that is less likely to coagulate while air is entrained during casting. Then, if the hot water supply of the molten lead alloy 15 continues, the product part 32 and the hole part 45 are filled in this order, and finally the molten lead 15 of the lead alloy rises also in a part of the sprue 42 as a hot water. .

  Then, after about 90 seconds have passed, the molten lead 15 is cooled and solidified, and for example, as shown in FIG. The pole part 18 formed by the portion 32 and the feeder 19 formed by the hot water lid plate 44 are mechanically cut and separated at a hole 45 portion as a runner.

  Here, the hot water lid 41 according to the present invention has a hot water lid plate 44, and since the plurality of holes 45 are formed in the hot water lid plate 44, the sectional area of the cut portion is increased. Can be small. As a result, mechanical separation between the pole column part 18 and the feeder 19 in the product part 32 can be easily performed in a short time. In the above-described embodiment, the portion of the hot water lid 41 is shifted to the right, but the portion can be cut and separated by a method such as twisting.

  After cutting between the parts of the pole column part 18 and the feeder 19, the split mold 31 is mechanically opened to release the pole part 18 as a product and take it out to produce a lead part. Note that the lead alloy material in the portion of the hot metal 19 formed at the gate 42 of the hot water lid 41 is heated and melted again and reused as the molten metal 15.

  In the best mode for carrying out the invention described above, the method of manufacturing the pole pole part 18 has been described in detail. However, the lead for other lead storage batteries such as the lead part bar 14 having a simpler shape is used. It can be used in the same manner for the manufacturing method of parts.

  INDUSTRIAL APPLICABILITY The present invention can be used for manufacturing lead parts for lead storage batteries that are used when welding electrode plates when manufacturing lead storage batteries.

It is the schematic of the split type | mold concerning this invention. It is the schematic of the hot water lid concerning this invention. It is the schematic of the split type correction structure concerning this invention. It is the schematic of the manufacturing method of polar pole components. It is the schematic of the welding method of the electrode group of a lead acid battery. It is a notch section perspective view of a control valve type lead acid battery.

Explanation of symbols

1: positive electrode plate, 2: negative electrode plate, 3: separator, 4: battery case, 5: lid, 6: strap,
7: Terminal, 8: Polar pole, 9: Ear part, 10: Safety valve part, 11: Copper core, 12: Comb teeth,
13: Plasma welding apparatus, 14: Lead component bar, 15: Molten metal, 16: Fence, 18: Polar pole component,
19: Pressing hot water, 21: Bottom plate, 22: Copper core stand, 31: Split mold, 31a: Split mold A,
31b: Split mold B, 31c: Split mold C, 31d: Split mold D, 32: Product part, 33: Recessed part,
34: Bolt, 35: Correction plate, 41: Cup, 42: Gate, 43: Gate plate,
44: Bath lid plate, 45: Hole, 45a: Center hole, 45b: Peripheral hole

Claims (3)

For lead-acid batteries that are manufactured by placing a split mold with a product part on the bottom plate and a cup with a sprue in turn, pouring molten lead alloy from the spout into the product part below, solidifying and releasing. In the lead component manufacturing method,
The split mold is configured by stacking a plurality of plates in the vertical direction, and has a recess crossing the product portion on one or both of the upper surface and the bottom surface of the plate, A method for producing a lead component for a lead-acid battery, wherein hot water is supplied to the lower product portion while rotating along the wall surface of the gate. 2. The method of manufacturing a lead component for a lead-acid battery according to claim 1, wherein the cup includes a gate plate having a gate and a cup plate having a plurality of holes. The hole portion includes a central hole portion and a plurality of peripheral hole portions. The molten metal is supplied from the peripheral hole portion to the product portion, and air is discharged upward from the central hole portion. A method for producing a lead component for a lead-acid battery according to claim 1 or 2, wherein

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