JPH03270119A - Lead wire welding of metallized plastic film capacitor and device therefor - Google Patents

Abstract

PURPOSE:To perform high speed welding of lead wires with constant intervals even in the case of an uneven electrode surface, by holding the lead wires unshakably by means of a clamp mechanism which also functions as a sub electrode and pressing them on the connection spots at both ends of a capacitor to be welded. CONSTITUTION:A capacitor main body 21 to be thrown in a prescribed position is held by means of a clip 24. Clamp mechanisms 27, 28 also function as sub electrodes are them moved toward the main body 21 by an air cylinder 31 until they collide against stoppers 36. At the time of collision with the stoppers 36, the lead wires 22, 23 held between the receiving seats 33, 34 are pressed on the connection spots 25, 26 of the body 21. The main electrode transfer mechanisms 39, 40 are moved by an air cylinder 43 to press the end parts of the lead wires 22, 23 by the main electrodes 37, 38. When impulse power is supplied from the power supply transformer 33, 46 between the receiving seats 33, 34 and the main electrodes 37, 38, a solder metal thermal spraying layers at the connection spots 25, 26 are melted to weld the lead wires 22, 23 to the connection spots 25, 26.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lead wire welding method and apparatus for metallized plastic film capacitors.

[Conventional technology]

-C, this type of metallized plastic film capacitor (hereinafter simply referred to as a capacitor) has electrodes 2.3 formed at both ends of the capacitor body l, and lead wires connected to the electrodes 2.3, as shown in FIG. 4 and 5 are to be welded. That is, a zinc layer 6 that is electrically conductive with the internal metal vapor deposited film is deposited on both ends of the capacitor body l, and a solder metallicon layer (metal spraying) 7 is further formed.
The lead wires 4 and 5 are welded to. Conventionally, the lead wires 4 and 5 were welded to the electrodes 2 and 3 after applying the base ends of the lead wires 4 and 5 to the electrodes 2 and 3, respectively, as shown in FIG. A pair of pressurizing electrodes 8 to 11 made of chromium copper or the like are pressurized at a constant pressure, and a welding power source 12.13 is connected via a transformer 14.15 between the pair of pressurizing electrodes 8 to 11. The lead wire 4.5 and the solder metallicon layer 7 are welded together by Joule heat generated between the pressure electrode 8.9 and the pair of pressure electrodes 11.12.

[Problem to be solved by the invention]

However, in the conventional method and apparatus described above, the electrode 2,
If the surface of the lead wires 4 and 5 is uneven, or the thickness of the solder metallicon layer 7 is uneven, the distance between the lead wires 4 and 5 is not constant, and as shown by the two-dot chain line in FIG. 4.5 was being expanded inadvertently.

Moreover, since the pair of pressurizing electrodes 8 to 11 pressurize the leads 4114.5 using separate and independent pressurizing mechanisms, it is not easy to set the respective pressurizing forces to be constant, and The configuration of the pressure mechanism is also complicated, and even if the solder metal layer 7 can be aligned uniformly, if the solder metal layer 7 is uneven or its thickness is uneven, the contact resistance of each layer will vary, making it difficult to weld. The condition is not constant, and a situation occurs in which the lead wire 4.5 expands inadvertently as shown by the two-dot chain line in FIG. Moreover, if the welding condition is not constant and uneven as described above, and the melting depth of the solder metallicon layer 7 is particularly deep, there is a risk of damaging the metal vapor deposited film inside the capacitor body 1. There is a problem in that a double structure must be formed in which a zinc layer 6 with a difference in metal melting temperature is interposed between the solder metal layer 7 and the zinc layer 6 as a stopper to prevent this damage.

Therefore, in view of the above circumstances, the present invention has been devised so that even if the surface of the electrode, which is the connection point of the metallized plastic film capacitor body, is uneven, the welding condition of the lead wire is always constant and no unevenness occurs, and the metallized plastic film capacitor An object of the present invention is to provide a lead wire welding method for a metallized plastic film capacitor, which is extremely convenient in use because the interval between the lead wires welded to both ends of the capacitor body is constant, and high-speed welding is also possible, and an apparatus therefor. purpose.

[Means to solve the problem]

The present invention has been made to achieve the above object, and in claim (1), the sub-electrode clamping mechanism holds the lead wire
By holding the lead wires between the plastic capacitors and constantly moving them to a fixed position, press the above lead wires to the connection points on both ends of the metallized plastic film capacitor's body, and then press them to the connection points on both ends of the metalized plastic film capacitor's body. A lead wire welding method for a metallized plastic film capacitor, in which a main electrode is pressed against each lead wire while the lead wires are pressed together, and a welding current is supplied between the secondary electrode clamp mechanism and the main electrode. It is characterized by: Claim (2) provides a clamping mechanism that also serves as an auxiliary electrode, which clamps the lead wire in an unoscillating manner and always moves it to a fixed position toward the connection point at both ends of the main body of a fixed metallized plastic film capacitor, and a metallized plastic film capacitor. Consists of a main electrode that is pressed against each lead wire that is pressed against the connection point at both ends of the capacitor body, and a welding power supply circuit that supplies welding current between the secondary electrode clamp mechanism and the main electrode. It features lead wire welding equipment for metallized plastic film capacitors.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the lead wire welding method and apparatus for a metallized plastic film capacitor according to the present invention will be described below with reference to the drawings. First, a description will be given of an apparatus for performing a lead wire welding method for a metallized plastic film capacitor. In FIG. 1, 21 is a capacitor body, 22.
23 is a lead wire. The capacitor body 21 is inserted into and chucked by a clip 24 installed in advance. At this time, the capacitor body 21 is chunked by the crimp 24 so that it is always in a fixed position. Both ends of the capacitor body 210 have connection points 25 and 26 that are electrically connected to the metal vapor deposited film inside. For the connection points 25 and 26, only a solder metal layer without a zinc layer is sufficient, unlike the conventional method. Each of the above lead wires 22.23 is attached to a clamp mechanism 27.2 which also serves as an auxiliary electrode.
8, the connection point 25. of the capacitor body 21.
It is set to move towards the 26th. Since the sub-electrode dual-purpose clamp mechanisms 27 and 28 have the same configuration on both the left and right sides, the one on the left side is attached to the base 29 so that the movable table 30 can be freely moved back and forth toward the capacitor body 21. It is. An air cylinder 31 as a driving source for movement is connected to the moving table 30. Of course, in addition to the air cylinder 31, a hydraulic cylinder or a cam mechanism can be used as the drive source.

Mounted on the movable table 30 is a clamper 32 which is shaped like scissors and which also serves as an auxiliary electrode and can be opened and closed by an opening and closing mechanism 47. The clamper 32 which also serves as an auxiliary electrode is a seat 3 made of a conductive material such as copper, which securely clamps the lead wire 22 without swinging when opened and closed.
It has 3,34.

The seats 33 and 34 are designed to have a length and a clamping pressure so that the lead wire 22 can be reliably clamped without being able to swing or shift. The seats 33 and 34 are connected to one end of the secondary winding of the power transformer 35. The moving table 30 is adapted to collide with a stopper 36 for regulating the fixed point position of movement so as to always stop at a fixed position with respect to the capacitor body 21. As shown in FIG.
It is designed to be pressurized towards 6.

The main electrodes 37, 38 are moved by main electrode moving mechanisms 39, 40 for the above-mentioned pressurization.

Since the main electrode moving mechanisms 39 and 40 have the same configuration on both the left and right sides, the one on the left side will move the moving platform 42 on the base 41 toward the capacitor body 21, as shown in FIG. You can wear it freely. The moving table 42 is connected to an air cylinder 43 as a driving source for its movement. A pressing rod 44 elastically biased by a spring 44 is attached to the movable table 42. The main electrode 37 is fixedly attached to the tip of the pressing rod 45. The pressing force of the main electrode 37 at the tip of the pressing rod 45 against the lead wire 22 can be adjusted as desired by adjusting the compression force of the spring 44. The main electrode 37 is connected to the other end of the secondary winding of the power transformer 35. Needless to say, the seats 33 and 34 of the other main electrode 38 and sub-electrode clamping mechanism 28 are connected to the secondary winding of the electrode transformer 46, as shown in FIG. The primary winding of each power transformer 35.46 is
Connect to a well-known welding power supply circuit that supplies impulse power as welding output.

Next, the operation of the metallized plastic film capacitor glue-1-wire welding method and apparatus having the above structure will be explained. First, as shown in FIG. 1, the capacitor main body 21, which is inserted into a predetermined position, is held by the clips 24. When the capacitor body 21 is held by the clip 24, the center of the capacitor body 21 is always held so that the position held by the clip 24 does not change each time the capacitor body 21 is held. Next, the sub-electrode clamping mechanism 27, 28 is placed in a recessed position with respect to the capacitor body 21 held by the clip 24, and the catch plate 33, 34
is opened by the opening/closing mechanism 47, and the Riet wire 22.
After receiving the lead wires 22.
23 is securely held so that it cannot swing. Thereafter, the air cylinder 31 moves each sub-electrode clamping mechanism 27, 28 toward the capacitor body 21 until it abuts against the stopper 36. When the auxiliary electrode clamping mechanisms 27 and 28 collide with the stopper 36, the lead wires 22 and 23 held between the seats 33 and 34 are pressed against the connection points 25 and 26 of the capacitor body 21.

In other words, the position where the sub-electrode clamp mechanism 27, 28 collides with the stopper 36 is located further inside the connection points 25, 26 than the position where the lead vA2223 contacts the surface of the connection points 25, 26 of the capacitor body 21. It is set in position. At this time, the main electrodes 37, 38 and the catch 33
, 34, the connection point of the capacitor body 21 is not in a molten state.
8 and the connection point 25 of the capacitor body 21
．． Lead wire 22 by a value commensurate with the distance between it and the surface of 26.
．． 23, a pressing force acts on the connection points 25 and 26 of the capacitor body 21. After that, air cylinder 43
The main electrode moving mechanism 39, 40 is moved to the capacitor body 21 by
Connecting point 2 of the capacitor body 21
The end of the lead wire 22.23, which is in the pressed state at 526, is pressed by the main electrode 37.38. This pressing force can be set arbitrarily by adjusting the elastic force of the spring 44.
In order to apply a pressing force to the lead wires 22 and 23 against the connection points 25 and 26 of the capacitor body 21,
In addition, there is no need to apply a large amount of pressure, and the lead wire 2223 can be connected to the connection point 25.26 of the capacitor body 2I.
It is sufficient to press it down. Next, impulse power as welding power is supplied from the power transformer 35.46 between the seats 33, 34 and the main electrode 3'7.38.

When impulse power is applied between the strike plate 33.34 and the main electrode 37.38, the strike force 33.34 and the main electrode 37.38
Joule heat is generated in the lead wires 22 and 23 between the capacitor body 21 and the solder metal layer at the connection points 25 and 26 of the capacitor body 21 melts, and as a result, the lead wires 22 and 23 are connected to the capacitor body 21 Welded at points 25 and 26. At this time, the leet cotton 22.23 is attached to the connection point 2 of the capacitor body 21 that was applied when the sub-electrode clamp mechanism 27.28 and the striker 36 were initially brought into contact.
5.26, the lead wire 2223 digs into the connection point 25.26 of the capacitor body 21, as shown in FIGS. 3 and 4.

This biting amount is 27.28
This corresponds to the pressing force that is applied when the stopper 36 and the stopper 36 initially collide. The stopper 36, as shown in FIG.
The lead wires 22 and 23 collide with the sub-electrode clamping mechanism 2728 so that they are always located at a certain distance O from the center of the capacitor body 21. Therefore, lead wire 2
2.23 are welded to the welding points 25.26 of the capacitor body 21, the pitch P between the lead wires 22.23 is the position where each sub-electrode clamping mechanism 27.28 collides with the stopper 36 and stops. It is always constant because it is equal to the mutual spacing in . Moreover, even if there is some imbalance in the pressing force of the main electrodes 37, 38 against the lead wires 22, 23, or even if there are irregularities in the connection points 25, 26,
Mainly secondary electrode clamp mechanism 27, 28 and stopper 3
6 is regulated by the pressing force of the lead wire 22.23 to the connection point 25.26 that is applied during the collision before welding with the lead wire 22.23, and the lead wire 22.23 is not allowed to swing at the seat 33.34. By firmly holding the wires without any problem, there is no problem such as the lead wires being welded in an oblique manner as in the conventional example shown in FIG. In addition, the above welding method is
Impul gives Sumi power and leads with Joule heat lol
Connect A22 and 23 to the connection point 25.2 of the capacitor body 21
Since welding is performed by instantaneous heating on the capacitor 6, it is possible to obtain a constant welding state at high speed and at all times, and the electrical characteristics of the capacitor body 21 are not heated to such a degree that tS occurs due to the high speed welding. .

〔Effect of the invention〕

As described above, according to the metallized plastic film capacitor glue single line welding method and apparatus according to the present invention,
Even if the surface of the electrode, which is the connection point of the metallized plastic film capacitor body, is uneven, the welding condition of the lead wire is always constant and no unevenness occurs, and because only the main electrode is pressed against the lead wire, It is sufficient to perform maintenance such as cleaning only the main electrode, and the spacing between the lead wires welded to both ends of the metallized plastic film capacitor body is constant, which not only allows for stable quality, but also automatic loading. This is extremely convenient when mounting on a printed wiring board using a device. Furthermore, unlike conventional methods, the connection point of the capacitor body where the lead wire is welded can be instantaneously heated with constant, stable welding of the lead wire, making it possible to achieve a sufficiently high quality welding condition with only a solder metallic layer without a zinc layer. Obtainable. It is also possible to speed up the welding of lead wires to the metallized plastic film capacitor body, which is of similar utility.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the lead wire welding method and device for a metallized plastic film capacitor according to the present invention, Fig. 2 is a configuration diagram of main parts of a clamping mechanism that also serves as an auxiliary electrode and a main electrode, and Fig. 3 The figure is an explanatory diagram showing the state of the lead wires positioned by the stopper, Figure 4 is an explanatory diagram showing the pitch of the lead wires positioned by the stopper, and Figure 5 is an explanatory diagram showing the pitch of the lead wires positioned by the stopper. A perspective view, FIG. 6 is a circuit diagram of an apparatus for carrying out a conventional lead wire welding method, and FIG. 7 is an explanatory diagram showing a malfunction that occurs during conventional lead wire welding. 21... Capacitor body, 22.23... Lead wire, 24... Clip, 25.26... Connection point, 27.28... Clamp mechanism that also serves as sub-electrode, 36...
・Stopper 37.38...Main electrode. Figure 3 Figure 4 Procedural amendment (spontaneous) April 16, 1991 Mr. Commissioner of the Japan Patent Office 1° Indication of case Patent application No. 69962 Name of invention Metallized plastic film capacitor glue wire welding method and device 3゜Relationship with the case of the person making the amendment

Claims (2)

[Claims] (1) The sub-electrode clamping mechanism clamps the lead wires in an unoscillating manner and then moves to a fixed position at all times to press the lead wires against the connection points at both ends of the metallized plastic film capacitor body and metallize them. With the lead wires pressed against the connection points at both ends of the body of the plastic film capacitor, each lead wire is pressed against the main electrode, and a welding current is applied between the above-mentioned sub-electrode-cum-clamping mechanism and the main electrode. A lead wire welding method for a metallized plastic film capacitor, characterized in that: (2) A clamping mechanism that also serves as an auxiliary electrode, which clamps the lead wire in a non-swingable manner and constantly moves it to a fixed position towards the connection point at both ends of the fixed metallized plastic film capacitor body, and a clamp mechanism that also serves as an auxiliary electrode, and which clamps the lead wire without swinging and constantly moves it to a fixed position at both ends of the metalized plastic film capacitor body. The welding power supply circuit is characterized by comprising a main electrode that is pressed against each lead wire that is pressed against the connection point of the main electrode, and a welding power supply circuit that supplies welding current between the secondary electrode-cum-clamping mechanism and the main electrode. Lead wire welding equipment for metallized plastic film capacitors.