JP2006244890A - Manufacturing method of lead-acid battery, and terminal welding device of the lead-acid battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method suppressing generation of burrs, when forming the terminal of a lead-acid battery by inserting a post into a bushing and welding both. <P>SOLUTION: When the tip of the bushing 23 and the tip of the post 25 are welded by flame emitted from a nozzle 28a of a first burner 28, the nozzle 28a of the first burner is moved rotatively on a first circular orbit 31, positioned on the vicinity of the outer periphery of the post and having the center axis of the post as the rotation axis, and the nozzle 30a of a second burner 30, emitting flame from the nozzle, is made to move rotatively on a second circular orbit, positioned on the vicinity of the inner periphery of an insertion hole 24 of a die 27 and having the center axis of the post as the rotation axis at an angular velocity that is the same as the first burner. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a manufacturing method for terminal welding of a lead storage battery and a terminal welding apparatus for the lead storage battery.

  Lead-acid batteries are used in various applications, but especially in lead-acid batteries for start-up, the tip of the terminal pole column that is integrally molded on the lid as the battery exterior and led out from the electrode plate group to the bushing with the insertion hole Mostly, a tapered terminal is formed by welding the bushing tip and the tip of the terminal pole column with a burner flame.

  Since the starting lead-acid battery drives the cell motor when the engine is started, it is discharged with a large current such as hundreds to hundreds of A, or is subjected to vibration impact during vehicle running. Therefore, it is necessary to secure the welding depth between the bushing and the pole column so that abnormal heat generation does not occur in the terminal portion even with a large current discharge, and deformation or breakage does not occur in the terminal portion due to vibration shock. .

  As a method for forming a lead storage battery terminal by welding a bushing and a pole column as described above, for example, a method disclosed in Patent Document 1 is known. In Patent Document 1, the pole column is inserted into the insertion hole provided in the bushing, and the tip of the burner (crater) is set within the inner periphery of the bushing insertion hole when the bushing and the pole column are welded with the burner flame. It is shown to rotate around the circumference.

In such a terminal welding method shown in Patent Document 1, the welding flame can be concentrated on the outer periphery of the bushing insertion hole-the outer periphery of the pole column without variation, thereby ensuring the welding depth and suppressing the variation in the welding depth. It has the advantage of being able to.
JP 2004-146178 A

  However, although such a terminal welding method has the above-mentioned advantages, the molten metal surface of the molten lead that is generated when the bushing and the pole column are melted easily rotates to rotate the burner crater. As a result, as shown in FIG. 1, burrs 14 are easily generated at the boundary between the top surface 12 and the side surface 13 of the terminal 11.

  When the burr | flash 14 arises in the terminal 11, when a lead acid battery is mounted in a vehicle and a vehicle side harness and the terminal 11 are connected, an operator's finger may be damaged. Further, since the metal mold 15 for molding the terminal shape is disposed on the side surface of the terminal 11 during welding, there is a problem that it becomes difficult to remove the metal mold 15 from the terminal 11 when the burr 14 is generated. In addition, when burrs are generated, a reworking operation is performed in which the burrs are burned with a burner flame and melted and removed, which has been a factor in reducing productivity.

  An object of the present invention is to suppress the generation of burrs generated in a terminal in a lead storage battery terminal obtained by welding a bushing and a pole column inserted therethrough as described above.

  In order to solve the above-described problems, the invention according to claim 1 of the present invention is such that a cylindrical pole column is inserted into a circular insertion hole provided in a bushing made of lead or lead alloy insert-molded in a battery exterior. Then, by inserting the bushing into a through hole provided in the mold, the inner wall of the through hole and the side surface of the bushing are arranged to face each other, and the tip of the bushing and the tip of the pole column are welded. A lead-acid battery manufacturing method for forming a lead-acid battery terminal, comprising a taper portion opened upward at a portion corresponding to the vicinity of the tip of the bushing of the mold, the tip of the bushing and the pole column When welding the tip part with a flame emitted from the crater of the first burner, the crater of the first burner is located on the vicinity of the outer periphery of the pole column, and the central axis of the pole column is a rotation axis On the first circular orbit A second burner that rolls and emits a flame from a crater, the crater of the second burner is located on the inner periphery of the through hole of the mold, and the center of the pole column The lead-acid battery manufacturing method is characterized in that it is rotationally moved on a second circular orbit having an axis as a rotation axis at the same angular velocity as that of the first burner.

  Further, the invention according to claim 2 of the present invention is the method for producing a lead-acid battery according to claim 1, wherein the second storage device has a predetermined phase angle delay with respect to the rotational movement of the crater of the first burner. The crater of the burner is rotated and moved.

  Furthermore, the invention according to claim 3 of the present invention welds a bushing made of lead or lead alloy insert-molded on the battery exterior and a cylindrical pole column inserted through a circular insertion hole provided in the bushing. A lead-acid battery terminal welding apparatus for forming a lead-acid battery terminal, having a mold having a through-hole, and inserting the bushing into the through-hole so that the inner wall of the through-hole and the side surface of the bushing are A die having a taper portion opened upward at a portion corresponding to the tip portion of the bushing of the die is welded to the tip portion of the bushing and the tip portion of the polar column. A first burner is provided, and the crater of the first burner is positioned on the vicinity of the outer periphery of the pole column, and is rotated on a first circular orbit with the central axis of the pole column as a rotation axis. Burner crater movement A second burner that includes a step and emits a flame from a crater, and the crater of the second burner is positioned on the vicinity of the inner periphery of the insertion hole of the mold by the burner crater moving means; And a lead-acid battery terminal welding apparatus, wherein the lead-acid battery terminal welding apparatus is configured to rotate and move on the second circular orbit having the central axis of the pole column as a rotation axis at the same angular velocity as that of the rotation of the first burner crater. It is shown.

  And the invention which concerns on Claim 4 of this invention is a lead storage battery terminal welding apparatus of Claim 3, It has a delay of a predetermined phase angle with respect to the rotational movement of the crater of the said 1st burner, and said 2nd The crater of the burner is rotated and moved.

  According to the lead storage battery manufacturing method or the lead storage battery terminal welding apparatus of the present invention described above, the generation of burrs at the lead storage battery terminal can be suppressed.

  A lead storage battery manufacturing method and a lead storage battery terminal welding apparatus according to embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 is a diagram showing a terminal welding device 21 for a lead storage battery according to the present invention, and FIG. 3 is a diagram showing a main part of the terminal welding device 21.

  The lead storage battery 22 has a bushing 23 made of lead or lead alloy insert-molded on its exterior. The bushing 23 is provided with an insertion hole 24, and a cylindrical pole column 25 is inserted into the insertion hole 24. In order to insert the cylindrical pole column 25, the insertion hole 24 has a circular cross section, and the inner diameter of the insertion hole is larger than the diameter of the pole column 25.

  Note that an electrode plate group (not shown) composed of a positive electrode plate, a negative electrode plate, and a separator is connected to the electrode pole 25.

  The terminal welding device 21 has a mold 27 that is attached to the side surface of the bushing 23 and has a tapered portion 26 that opens upward at a portion corresponding to the tip portion of the bushing 23. The mold 27 has a through-hole 27a for inserting the bushing 23. After the lead welding battery 22 is attached to the terminal welding device 21, the mold 27 is lowered or the lead storage battery 22 is mounted. The bushing 23 is inserted into the through hole 27a.

  In this state, the inner wall of the through-hole 27a and the side surface of the bushing 23 are arranged to face each other, so that heat during welding is radiated from the bushing 23 to the mold 27.

  The terminal welding device 21 of the present invention has a first burner 28 for welding the tip of the bushing 23 and the tip of the pole column 25. Then, as shown in FIG. 2 or FIG. 3, the first circle with the crater 28a of the first burner 28 located on the vicinity of the outer periphery of the pole column 25 and the central axis L of the pole column 25 as the rotation axis 29a. Burner crater moving means 29 for rotating the track 31 is provided.

  FIG. 2 shows an example in which the burner crater moving means 29 is composed of a rotating shaft 29a, a motor 29b for rotating the rotating shaft 29a as a shaft, and a gear box 29c for transmitting driving force to the rotating shaft 29a. However, what is necessary is just to have the function to rotate and move the crater 28a, and it is not limited to the example of FIG.

  The terminal welding device 21 of the present invention includes a second burner 30 in addition to the first burner 28. The crater 30a of the second burner 30 is positioned on the vicinity of the inner periphery of the through hole 27a of the mold 27 by the burner crater moving means 29, and the central axis L of the pole column 25 is the rotation axis 29a. The circular orbit 32 is rotationally moved at the same angular velocity as the angular velocity when the crater 28a of the first burner 28 is rotated. It should be noted that the first burner 28 and the second burner 30 are mechanically coupled to each other so that they can be rotated at the same angular velocity by the same rotating shaft 29a.

  The operation of the first burner 28 and the second burner 30 will be described in detail with reference to FIG. FIG. 4 is an overhead view of the mold 27, the bushing 23, and the pole column 25, and these members and the trajectories of the crater 28 of the first burner 28 and the crater 30a of the second burner 30 (respectively The relative positions of the first circular orbit 31 and the second circular orbit 32) are shown.

  In FIG. 4, point A indicates the position of the crater center axis 28 b of the first burner 28, and point B indicates the position of the crater center axis 30 b of the second burner 30.

  The crater 28a of the first burner 28 rotates and moves on the first circular orbit 31 having the central axis L of the pole column 25 as the rotation axis (29a). Since the first burner 28 is used to weld the tip of the pole column 25 and the tip of the bushing 23, it is preferable to set the first circular track 31 in the vicinity of the inner periphery of the insertion hole 24.

  The first circular orbit 31 can be set by the difference in height between the bushing 23 and the tip of the pole column 25. For example, as shown in FIG. 3, when the tip of the pole column 25 is above the tip of the bushing 23, the tip of the pole column 25 is mainly melted and welded. It is preferable to set one circular orbit 31 so as to pass through a point A set in the vicinity of the inner periphery of the insertion hole 24 and on the pole column 25 side.

  On the contrary, when the tip of the bushing 23 is positioned on the tip of the pole column 25, the tip of the bushing 23 is mainly melted and welded, so that the crater center shaft 28b is located near the inner periphery of the insertion hole 24 and on the bushing 23 side. It is preferable to set the first circular orbit 31 so as to pass through the point A ″ set to.

  Further, when the tip of the bushing 23 and the tip of the pole column 25 are substantially at the same height, the tip of the pole column 25 and the tip of the bushing 23 are evenly melted and welded. It is preferable to set the first circular orbit 31 so as to pass through the point A ′ set at the boundary with

  Since the crater 28a of the first burner 28 emits a burner flame and rotates on the first circular orbit set as described above, the welding depth between the bushing 23 and the pole column 25 is uniform and uniform. Can be. During this time, the crater 30a is rotated on the second circular orbit 32 at the same angular velocity as the crater 28a while releasing the flame from the crater 30a of the second burner 30.

  While the bushing 23 and the pole column 25 are welded by the first burner 28, the crater 28a of the first burner 28 rotates on the first circular track 31, so that the ends of the bushing 23 and the pole column 25 are melted. The molten metal generated as a result flows on the taper portion 26 of the mold 27.

  Conventionally, the molten metal that has flowed through the tapered portion 26 is cooled and solidified by the mold 27, so that a burr 14 as shown in FIG. 1 has occurred.

  In the present invention, since the tapered portion 26 is heated by the second burner 30, the cooling of the molten metal flowing through this portion is suppressed, so that the molten metal falls along the tapered portion 26, and the bushing 23 -the pole column 25 Returning to the weld, the generation of burrs is suppressed. At the same time, heat is supplied from the second burner 30 to the side surface and the top surface of the bushing 23 to delay the cooling rate. During this time, the R portion is formed by the interfacial tension of the molten metal, and the generation of burrs is further suppressed. Is done.

  In the present invention, the second burner 30 mainly obtains a burr suppressing effect by heating the tapered portion 26. At the same time, in order to supply heat to the side surface and the top surface of the bushing 23, the crater 30a of the second burner 30 is located in the vicinity of the inner periphery of the through hole 27a of the mold 27. It passes through the point B ′ and rotates on the second circular orbit 32 having the central axis (L) of the pole column 25 as the rotation axis (29a).

  Since the first burner 28 supplies the heat amount for welding the bushing 23 and the pole column 25, the amount of fuel gas corresponding to the desired welding depth is necessary, but the second burner 30 is made of molten metal. Since it is for delaying the cooling, a smaller amount of fuel gas than the first burner 28 may be set. When excessive fuel gas is supplied to the second burner 30, the molten metal surface fluctuates vigorously due to the momentum of the release flame, and the molten metal jumps to lead balls and fume (lead oxide powder becomes smoke-like and into the atmosphere. To be dissipated). Therefore, although it is necessary to limit the amount of fuel gas to the second burner 30 to a certain extent or less, the amount of fuel gas may be set individually according to conditions such as the bushing and the shape of the pole pole.

  In the present invention, preferably, the crater 30a of the second burner 30 is rotationally moved with a delay of a predetermined phase angle with respect to the rotational movement of the crater 28a of the first burner 28. In FIG. 4, when the crater center axis 28b of the first burner 28 is at the point A and the crater 28a rotates clockwise, the crater center axis 30b of the second burner 30 is set to the position of the point B- Sets the phase delay of angle β. As a result, compared to the case of the same phase (point A-point B) and the case where the crater center axis 30b of the second burner 30 is advanced by the phase angle α with respect to the crater center axis 28b of the first burner 28. Thus, the R portion is more easily formed.

  The setting of the angle β differs depending on the rotational angular velocity (ω) of the crater 28a of the first burner 28 and the crater 30a of the second burner 30. For example, when ω is 360 ° / min, the angle β is 15-30. Can be set in the range of °.

  In the lead-acid battery terminal welding device 21 according to the present invention, FIG. 2 does not show a mechanism for moving the mold 27 up and down, a combustion gas supply function, a gas flow rate control function, a welding time control function, etc. The function required for the terminal welding apparatus may be the same as that of the conventional one.

  Hereinafter, the effects of the present invention will be described with reference to examples.

(Example A)
In the above-described embodiment of the present invention, when the crater 28a of the first burner 28 is at the point A, the crater 30a of the second burner 30 is set to the point B +, and the lead-acid battery terminal is created. This is designated as Example A. The phase angle deviation α is 20 °, and the crater 28 a of the first burner 28 is delayed with respect to the crater 30 a of the second burner 30.

(Example B)
In the above-described embodiment of the present invention, when the crater 28a of the first burner 28 is at the point A, the crater 30a of the second burner 30 is set at the point B, and a lead-acid battery terminal was created. This is designated as Example B. The crater 28a of the first burner 28 and the crater 30a of the second burner 30 rotate and move in the same phase.

(Example C)
In the above-described embodiment of the present invention, when the crater 28a of the first burner 28 is at the point A, the crater 30a of the second burner 30 is set to the point B-, and a lead-acid battery terminal was created. This is referred to as Example C. The phase angle shift β is 20 °, and the crater 30a of the second burner 30 is delayed with respect to the crater 28a of the first burner 28.

(Comparative example)
From the above-described embodiment of the present invention, the fuel gas was not supplied to the second burner 30, the second burner was put into a fire extinguisher, and welding was performed using only the first burner.

A taper terminal T ₂ of a positive electrode shown in JIS D5301 (starting lead storage battery) under the above-described conditions is created (the cross-sectional shape is a trapezoid having an upper base of 17.6 mm, a lower low of 19.5 mm, and a height of 17.0 mm). The incidence of burrs on the terminals was measured. Other test conditions in Examples A to C and Comparative Examples are as follows.

  In Examples A to C and Comparative Examples, the bushing 23 and the pole column 25 are made of Pb-3.0 mass% Sb alloy, the inner diameter of the insertion hole 24 of the bushing 23 is 11.0 mm, and the outer diameter of the pole column 25. Was 10.5 mm. Further, when the pole column 25 was inserted into the insertion hole 24, the tip of the pole column 25 was exposed from the tip of the bushing 23.

  In Examples A to C and the comparative example, the distance between the crater center axis 28b of the first burner 28 and the rotation axis 29a (the distance between the points A to L) is 4.7 mm, and the crater 28a of the first burner 28 is The rotational angular velocity was 360 ° / min. The diameter of the crater 28 of the first burner 28 was 1.7 mm, and LPG as fuel gas was supplied at a flow rate of 5.2 l / min and oxygen gas at a flow rate of 17.9 l / min.

  In Examples A to C, the distance between the crater center axis 30b of the second burner 30 and the rotation axis 29a (the distance between points B to L, the distance between points B + to L, and the distance between points B− to L) is 11. The rotational angular velocity of the crater 30a of the second burner 30 was 360 ° / min. The diameter of the crater 30 of the second burner 30 was 3.0 mm, and LPG as fuel gas was supplied at a flow rate of 0.5 l / min and oxygen gas at a flow rate of 2.0 l / min. Since the radius of the tip of the bushing 23 is 8.8 mm, the crater central axis 30 b of the second burner 30 is positioned at a position 2.5 mm (tapered portion 26) outward from the through hole 27 a of the mold 27. It was.

  Terminal welding was performed under the above conditions with a welding time of 3.0 seconds, and the occurrence rate of burrs on the terminals was measured. The results are shown in Table 1.

  From the results shown in Table 1, it can be seen that according to the present invention, the burr generation rate during terminal welding can be remarkably suppressed. In particular, in the present invention, the burring rate (%) is set to 0 in this embodiment by delaying the crater 30a of the second burner 30 with respect to the crater 28a of the first burner 28 (Example C). I was able to.

  As described above, according to the present invention, the life characteristics of the control valve type lead storage battery can be remarkably improved, and it is suitable for various control valve type lead storage batteries including backup applications.

Diagram showing burrs on lead-acid battery terminals Diagram showing terminal welding equipment The figure which shows the principal part of a terminal welding device The figure which shows the relative positional relationship of a bushing, a terminal, and a metal mold | die, and a 1st circular track and a 2nd circular track.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Terminal 12 Top surface 13 Side surface 14 Burr 15 Mold 21 Terminal welding apparatus 22 Lead storage battery 23 Bushing 24 Insertion hole 25 Polar pole 26 Taper part 27 Mold 27a Through-hole 28 1st burner 28a (1st burner) crater 28b crater central axis 29 (of the first burner) 29 burner crater moving means 29a rotating shaft 29b motor 29c gear box 30 second burner 30a crater central axis 31 of (second burner) crater central axis 31 First circular orbit 32 Second circular orbit

Claims (4)

By inserting a cylindrical pole column into a circular insertion hole provided in a bushing made of lead or lead alloy insert-molded on the battery exterior, and inserting the bushing into a through hole provided in the mold, the penetration A method of manufacturing a lead storage battery in which a hole inner wall and a side surface of the bushing are arranged opposite to each other, and a lead storage battery terminal is formed by welding the tip of the bushing and the tip of the pole pole,
A taper portion opened upward at a portion corresponding to the vicinity of the tip of the bushing of the mold,
When the tip of the bushing and the tip of the pole column are welded with a flame emitted from the crater of the first burner, the crater of the first burner is positioned near the outer periphery of the pole column, and While rotating on a first circular orbit with the central axis of the pole column as a rotation axis,
Having a second burner emitting a flame from the crater;
A crater of the second burner is positioned on the inner periphery of the insertion hole of the mold and on a second circular orbit with the central axis of the pole column as a rotation axis, the first burner A method for producing a lead-acid battery, characterized in that it is rotated at the same angular velocity. The lead-acid battery manufacturing method according to claim 1, wherein the crater of the second burner is rotationally moved with a delay of a predetermined phase angle with respect to the rotational movement of the crater of the first burner. . A lead storage battery terminal welding device for forming a lead storage battery terminal by welding a bushing made of lead or lead alloy insert-molded on a battery exterior and a cylindrical pole post inserted into a circular insertion hole provided in the bushing Because
By having a mold having a through hole and inserting the bushing into the through hole, the inner wall of the through hole and the side surface of the bushing are arranged to face each other and correspond to the tip of the bushing of the mold A mold having a taper portion opened upward in a portion to be
A first burner for welding the tip of the bushing and the tip of the pole column;
A burner crater moving means for rotating the crater of the first burner on a first circular orbit with the central axis of the pole column as a rotation axis located near the outer periphery of the pole column;
Having a second burner emitting a flame from the crater;
By the burner crater moving means, the crater of the second burner is positioned in the vicinity of the inner periphery of the through hole of the mold, and on a second circular orbit with the central axis of the pole column as the rotation axis Is rotated at the same angular velocity as the angular velocity at the time of rotation of the first burner crater. 4. The lead-acid battery terminal welding apparatus according to claim 3, wherein the crater of the second burner is rotationally moved with a delay of a predetermined phase angle with respect to the rotational movement of the crater of the first burner. .

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