CN1656583A - Joint terminal for electrolytic capacitor, manufacturing method and manufacturing device thereof - Google Patents

Abstract

Tab terminal manufacturing equipment capable of providing a tab terminal having an aluminum depressed part free from burrs, uniform in thickness, and round at four corners, comprising a slitting blade for nicking a slit line at the extruded part of a depressed aluminum head part by inversing the blade from a forward movement to a backward movement at the abutted position thereof on a punch for depressing the aluminum head part and a removing blade for cutting off the extruded part of the aluminum head part along the slit line by moving in the direction reverse to that of the forward moving slitting blade, wherein a notch part is formed in the slitting cutting blade at the edge portion.

Description

Joint terminal for electrolytic capacitor, manufacturing method and manufacturing device thereof

technical field

The present invention relates to a lead-out wire of an electrolytic capacitor called a joint terminal, a manufacturing method and a manufacturing device thereof.

Background technique

As shown in Fig. 13, the joint terminal is a structure in which the wire a and the aluminum head b are butt-jointed in a straight line and welded. The aluminum head has a circular aluminum wire with a punch Flatten into a flat shape.

This flattened portion f is formed in a rectangular shape by using a cutting edge to cut off a portion overflowing from the punch. As a result, cutting burrs X are likely to be generated on the peripheral edge of the crushed portion f.

An electrolytic capacitor is an electrolytic capacitor in which an aluminum foil is attached to the flattened part f and wound into a roll shape. If this burr X touches an aluminum foil (not shown), it will be damaged, and this will cause the quality deterioration of an electrolytic capacitor.

In order to avoid such a problem, various solutions to the burr problem have been proposed so far. For example, it is disclosed in Japanese Patent Publication No. 59-10743 and Japanese Patent Publication No. 62-52450 that when stamping, the wall thickness of the burr is thinned to make it The height is controlled within the range of the thickness of the flattened part, so as to prevent the burrs from touching the aluminum foil. But in this case, the burr itself is not removed, so there is no guarantee that the aluminum foil will not be damaged.

On the other hand, the method disclosed in JP Miko Sho 6-36574 is to use two upper and lower cutting edges, first lower the upper cutting edge, cut into half of the thickness of the flattened part, and then raise the lower cutting edge to cut off. remaining half the thickness. According to this method, since the lower cutting edge rises to a position beyond the bottom dead center of the upper cutting edge, cutting off burrs are less likely to occur.

However, when the upper cutting edge returns to the rear and upper side of the lowered bottom dead center, since the periphery of the crushed portion hangs on the cutting edge, an upward return burr tends to occur.

This situation will be described using FIGS. 11 and 12 . (In addition, X represents the return burr, 21 represents the punch, 22 represents the receiving platform, and 23 represents the upper cutting edge.)

When the punch 21 is lowered to flatten the aluminum wire of the stand 22 to form the flattened portion f, the upper cutting edge 23 is lowered together with the punch 21, and when the distance between the punch 21 and the stand 22 is H1, the Touch the part overflowing from the punch 21 (refer to FIG. 11A ).

Further lower the punch 21 and stop it when the distance from the receiving table 22 is H2. In the slight descending process from H1 to H2, the aluminum wire sandwiched between the punch 21 and the receiving table 22 will further overflow, and be pressed against the side of the cutting edge 23 as shown by the arrow in FIG. 11A .

When the punch 21 transitions from the position of the interval H2 to rising, the cutting edge 23 also rises at the same time. At this time, since the cutting edge 23 scrapes a part of the aluminum wire rod against its side surface, a return burr X is generated (refer to FIG. 11B ).

In addition to such a return burr X, when cutting the overflowing part with the upper and lower cutting edges, since the thickness of the aluminum part is different when cutting with the upper and lower cutting edges, as shown in Fig. 12 , there is also a problem that the circular arc shape around the flattened part is difficult to be the same circular arc shape.

Therefore, the object of the present invention is to manufacture a joint terminal that does not produce cutting burrs or return burrs that damage the aluminum foil of an electrolytic capacitor or deteriorate its performance, and which are formed at the four corners of the crushed part. While the cross-sectional shape of the part is formed in an arc shape, the thickness of the crushed part is uniformly formed.

In addition, another object of the present invention is to optimize the arc shape of the cross-section and design the planar portion of the crushed portion to be wide, thereby expanding the contact area with the aluminum foil as much as possible and improving the efficiency of the electrolytic capacitor.

Contents of the invention

In order to solve the above-mentioned problems, the electrolytic capacitor joint terminal manufacturing apparatus in the present invention includes a cutting blade for cutting and a cutting blade for cutting, wherein the cutting blade for cutting is used to press the aluminum head at the pressing position of the punch. , reversing from forward motion to return motion and engraving a notch line on the overflow of the flattened aluminum head; the cutting edge for cutting moves in the opposite direction to the The overflow portion of the aluminum head is cut off by wire, and a notch is formed on the edge portion of the cutting edge for cutting.

In addition, as a preferable aspect, the punch for crushing the aluminum head has an edge provided on its periphery so as to be higher than the surface of the punch, and the inner side of the edge is formed in an arc shape.

Furthermore, it is preferable to have a cutting edge reverse position adjusting mechanism for freely adjusting the reverse position of the cutting edge for cutting.

Another method of manufacturing a joint terminal for an electrolytic capacitor according to the present invention includes the steps of: forming the aluminum head in a flat shape with a predetermined thickness using a punch for flattening the aluminum head; The cut-in cutting edge with a notch is formed on the part of the above-mentioned flattened aluminum head protruding from the flattening punch, and the cut-off cutting edge provided at a position opposite to the above-mentioned cut-in cutting edge , cutting the overflow portion formed with the partial cut-in from the opposite side of the cut-in portion.

In addition, when forming a partial cut using the cutting edge for cutting, it is preferable to provide a gap between the overflow portion and the crushed aluminum head.

In addition, it is preferable that an edge is provided around the punch for crushing the aluminum head, and the edge portion is formed in an arc shape.

A joint terminal for an electrolytic capacitor as another aspect of the present invention can be obtained by the manufacturing method described above, and is for an electrolytic capacitor in which the thickness of the crushed part of the aluminum head is the same and the four corners of the cross section of the crushed part are formed in an arc shape. connector terminal.

In addition, when the thickness of the crushed portion is taken as 1, the arc radius of the above-mentioned arc shape is preferably in the range of 0.03 to 0.5. Furthermore, it is preferable that the surface of the above-mentioned crushed part is smooth, and even if a protrusion is formed, its height does not exceed 0.005 mm.

According to the present invention, it is possible to manufacture a joint terminal having the same thickness of the crushed portion while removing cutting burrs and returning burrs, which is extremely beneficial for improving the quality of electrolytic capacitors.

Description of drawings

Fig. 1 is an overall front view of a joint terminal manufacturing apparatus embodying the present invention.

Fig. 2 is an enlarged view showing the cutting device of Fig. 1 in order of steps.

Fig. 3 is an enlarged view showing the cutting device of Fig. 1 in order of steps, and the right half of the cutting device is omitted.

Fig. 4 is an enlarged view showing the cutting device of Fig. 1 in order of steps, and the right half of the cutting device is omitted.

Fig. 5 is an enlarged view showing the cutting device of Fig. 1 in order of steps, and the right half of the cutting device is omitted.

Fig. 6 is an enlarged view showing the cutting device of Fig. 1 in order of steps, and the right half of the cutting device is omitted.

FIG. 7 is a further enlarged view showing the main parts of FIG. 4 in the order of steps.

FIG. 8 is a further enlarged view showing the main parts of FIG. 4 in order of steps.

Fig. 9 is a further enlarged view showing the main parts of Fig. 4 in order of steps.

Fig. 10 is an enlarged sectional view of a punch embodying the present invention.

Fig. 11 is an enlarged view of main parts of a prior art example.

Fig. 12 is an enlarged cross-sectional view of a crushed portion of a joint terminal manufactured by a prior art device.

Fig. 13 is an overall perspective view of the joint terminal of Fig. 12 .

Fig. 14 is an enlarged cross-sectional view of a crushed portion of the joint terminal in the present invention.

Detailed ways

Figure 1 shows an overall front view of the device of the present invention.

The receiving table 1 is fixed on the foundation 2, and a punch 3 is arranged above it, and the two sides are arranged in an opposite manner.

A cutting device 4 is provided between the receiving platform 1 and the punch 3 , and the lifting platform 5 slides freely through the pillar 6 erected on the foundation 2 . The punch 3 passes through the vertical through hole 7 provided on the lifting platform 5 .

The punch elevating table 8 is slidably inserted through the pillar 6 in the same manner as the elevating table 5 .

Lifting rod 9, its lower end is connected on the punch elevating platform 8, and its upper end is connected on the driving source (not shown). The elevating rod 9 moves up and down so that the punch 3 and the punch elevating table 8 move up and down simultaneously.

The cam 10 is in contact with the roller 12 of the screw rod 11 whose length can be adjusted freely, and the screw rod 11 is connected on the lifting table 5, thereby constituting the cutting edge reverse position adjustment mechanism.

As shown in the detailed view of FIG. 2 , the cutting device 4 is integrally mounted on the left and right sides of the punch 3 and the receiving table 1 so that the cutting blades are vertically close to each other. .

As shown in the enlarged view of FIG. 7 , the cutting edge 13 for cutting has a notch P on the edge thereof.

Next, if the lifting rod 9 is driven to lower the punch lifting table 8, the punch 3 will drop onto the aluminum head b placed on the receiving table 1, and the aluminum head b will be crushed to form a flat shape with a predetermined thickness. (image 3).

Next, by lowering the cutting device 4 by the cam 10, the cutting edge 13 for cutting is cut into a part of the part overflowing from the punch 3 of the aluminum head b, and a cutting line is engraved on the overflow part (FIG. 4) .

Then, only the cutting device 4 is reversed and raised, and while the cutting edge 13 for cutting is upwardly separated, the cutting edge 14 for cutting below is moved above the front end of the punch 3, and the aluminum head b is cut away from the cutting line. overflow, thereby cutting it off (Figure 5). The excised aluminum slag is blown away by air.

Next, the punch 3 is raised to open the top of the receiving table 1 to obtain a joint terminal of the product ( FIG. 6 ).

By adjusting the length of the screw 11, the mutual timing and stroke of the punch 3 and the cutting device 4 can be controlled. In FIGS. 7 to 9 , the positional relationship between the punch 3 and the cutting edge 13 for cutting is shown enlarged in a state where the timing and the stroke are adjusted.

The method of manufacturing the joint terminal in the present invention will be described in more detail with reference to FIGS. 7 to 9 . The punch 3 descends to flatten the aluminum head to a predetermined thickness, and a part of the aluminum head b overflows from the punch 3 . Next, the cutting edge 13 for cutting is lowered, and it becomes the state from FIG. 7 to FIG. 8 .

In FIG. 7 , the cutting edge 13 for cutting hits the overflow portion, and presses down the overflow portion as shown in FIG. 8 . The vicinity of the boundary between the portion sandwiched between the punch 3 and the receiving table 1 and the overflowing portion is stretched by this pressing. When the punch 3 is lowered only from the position shown in FIG. 7 by the depth of the notch P of the edge, the overflow portion is cut off from the edge at one end of the notch P.

Next, as shown in FIG. 9, when the cutting edge 13 is further lowered and moved to a position about half the thickness of the flattened aluminum head b, the stretched part is broken, and the part is pulled back. To the punch 3 side, resulting in the so-called rebound phenomenon. Due to this phenomenon, a gap t is generated between the cutting edge 13 and the crushed portion.

Since the gap t is thus formed, the cutting edge 13 does not scrape the periphery of the crushed portion when the cutting edge 13 shifts to rise. As a result, no return flash occurs.

Here, as shown in FIG. 10, an edge higher than the punch surface is erected on the periphery of the punch 3, and the inner side of the edge is formed into a circular arc 15, thereby, as shown in FIG. 14, A joint terminal in which the thickness of the flattened part of the aluminum head is uniform and the four corner arcs of the cross section have the same arc shape can be obtained.

The joint terminal of such an aluminum head has no front-to-back direction, and does not damage the extremely thin aluminum foil, so that a high-quality electrolytic capacitor can be obtained.

When the thickness of the crushed portion is 1, the arc radius of the arc shape of the four corner arcs is preferably in the range of 0.03 to 0.05. If it is less than 0.03, the four corner arcs will be angular and the aluminum foil may be damaged. On the other hand, if it exceeds 0.50, discontinuous corner lines may be generated at the boundary between the arc portion and the portion, and the aluminum foil may be damaged.

In addition, it is preferable that the surface of the crushed part is smooth, and even if a protrusion is formed, its height must not exceed 0.005 mm.

In addition, in the embodiments of the present invention shown in the drawings, although only the form in which the punch and the cutting device are moved up and down is exemplified, even if they move to the left and right, the gist of the present invention will not be changed.

Claims (9)

1. A joint terminal manufacturing device for electrolytic capacitors, comprising: a cutting edge for cutting and a cutting edge for cutting, wherein the cutting edge for cutting is used to move from the forward movement to the pressing position of the punch for aluminum head flattening Reversing for return motion to engrave notch line on the overflow of the flattened aluminum head; the cutting edge for cutting moves in the opposite direction to the cutting edge for cutting in the forward motion above, and cuts the aluminum head along the above line of cutting The overflow portion is formed with a notch on the edge portion of the above-mentioned cutting edge for cutting. 2. The electrolytic capacitor joint terminal manufacturing apparatus according to claim 1, wherein the punch for crushing the aluminum head is provided with an edge higher than the surface of the punch on its periphery, and the inner side of the edge is formed as arc shape. 3. The apparatus for manufacturing tab terminals for electrolytic capacitors according to claim 1, further comprising a cutting edge reverse position adjusting mechanism for freely adjusting the reverse position of the cutting cutting blade. 4. A method of manufacturing a joint terminal for an electrolytic capacitor, which is characterized in that it includes the following steps: using a punch for flattening the aluminum head, forming the aluminum head into a flat shape, and making it a predetermined thickness, and using it on the edge The cutting edge provided with a notch is partially cut into the part of the above-mentioned flattened aluminum head that protrudes from the aluminum head flattening punch, and is provided at a position opposite to the above-mentioned cutting edge. The cutting edge for cutting cuts off the above-mentioned overflow portion formed with the partial cut-in from the opposite side of the above-mentioned cut-in portion. 5 . The manufacturing method according to claim 4 , wherein a gap is provided between the overflow portion and the crushed aluminum head when the partial cut is formed by the cutting edge for the cut. 5 . 6. The manufacturing method according to claim 4, wherein an edge is provided on the periphery of the punch for crushing the aluminum head, and the edge portion is formed in an arc shape. 7. A joint terminal for an electrolytic capacitor, which is a joint terminal for an electrolytic capacitor obtained by using the manufacturing method described in any one of claims 4 to 6, the thickness of the flattened part of the aluminum head is the same, and the flattened part The four corners of the cross section are formed in an arc shape. 8 . The joint terminal for an electrolytic capacitor according to claim 7 , wherein when the thickness of the crushed portion is 1, the arc radius of the arc shape is in the range of 0.03 to 0.50. 9. The joint terminal for an electrolytic capacitor according to claim 7 or 8, wherein the surface of the crushed part is smooth, and even if a protrusion is formed, the height thereof does not exceed 0.005 mm.

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