JPH01150317A - Sealing method for electronic component - Google Patents

Abstract

PURPOSE:To make the speed of a machine high and to reduce cost, by attaching a roller to a head, which is rotated on a rotary shaft as a center, at an angle inclined from the rotary shaft, attaching a sealing body, compressing the roller to the edge of the opening of a case, and performing curling work. CONSTITUTION:An element, in which a sealing terminal 1 is fixed to an electrolytic capacitor element 3, is accommodated in an Al case 2. The sealing terminal plate 1 is loaded in the opening part of the case. A head 11 is rotated as a unitary body with a spindle 10. A roller 12 is inclined from the rotary shaft of the head 11 by 3-15 deg.. The roller 12 is built in a machining means. The roller 12 is compressed to the edge of the opening end of the case by using the machining means. Then curling work is performed. The tip of the case 2 is made to cut into the elastic body of the sealing terminal plate for sealing. Bearings 13 hold the roller 12 so that the roller is freely rotated. Since the bearings 13 do not extrude out of the side surface of the case 2, the entire side surface of the case 2 other than the part to be curled is chucked, and the curling work can be performed. A device, whose total length is extremely short can be manufactured. The speed of the machine can be made high, and the productivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This description relates to a method of sealing electronic components such as electrolytic capacitors.

Conventional technology Conventional electrolytic capacitors are made by roughening high-purity aluminum foil, winding an anode foil and a cathode foil with a dielectric oxide film together with a separator, impregnating them with electrolyte to form an electrolytic capacitor element, and then sealing the foil. The electrolytic capacitor body obtained by combining the bodies is housed in a bottomed cylindrical aluminum case,
The open end was sealed to create a finished product.

The conventional manufacturing method for sealing the case and sealing body of an electrolytic capacitor is as follows.

First, as shown in Figure 2, the case 2 to be used already has a protrusion formed inwardly over the entire circumference near the open end, and the case 2 has a three-metal electrolytic capacitor element with a sealed terminal plate 1. Insert the sealed terminal plate 1't- into the protrusion.
Lock it. Next, as shown in FIG. 2B, the peripheral edge of the open end of the case 2 is curled inward by a roller 6 that intersects at right angles to the rotation axis of a head 60 that rotates together with the spindle 4, and its tip is bent by the elastic force of the sealed terminal plate 1. It was sealed by digging into the body.

The problem that the invention seeks to solve However, the conventional manufacturing method has the following problems.

In the conventional method as shown in FIG. 2, the bearing 7 of the roller 6 protrudes from the curled portion to the case 2 side, so in the case of a product with a short overall length, the case 2t - the chuck 8 to be fixed
could not be manufactured because the dimensions could not be secured. In addition, due to the need to secure chuck dimensions, the outer diameter of the bearing 7 was small, and the load capacity was small, resulting in a short lifespan.In addition, in order to maintain a constant curl shape, the rounded portion of the roller 6 must be accurately aligned with the case. In order to accurately set the position of the roller 6, it was necessary to adjust the thickness of the shim 9 when replacing the roller, and also to eliminate play in the thrust direction. Further, since the diameter of the roller 6 is small, the radius of curvature of the contact portion with the case 2 is small and the contact condition is poor, so that when the speed of the machine is increased, abnormal deformation occurs in the curled portion. However, due to the slow speed of the machine and low production efficiency, it was not possible to reduce production costs.In addition, with this method, the roller 6 presses the case 2 from the axial direction and forcibly curls it inward, so it is difficult to curl it. There were large variations in shape, and the quality of sealing was unstable.

The present invention solves these problems and makes it possible to manufacture a product with a particularly short overall length, and also reduces production costs by increasing the speed of the machine, thereby providing an inexpensive product.

Means for Solving the Problem In order to solve this problem, the present invention constitutes a processing means by attaching a roller that can freely rotate at an angle with respect to the rotation axis to a head that rotates around a rotation axis. death,
After the sealing body is inserted into the opening of the case housing the component elements, the rollers of the processing means are pressed against the periphery of the opening end of the case to apply a curling force.

With this configuration, the bearing of the roller of the processing means does not protrude to the side of the case during curling, so all sides of the case other than the curled part can be chucked and curled, and even products with short overall length can be manufactured easily. becomes possible.

EXAMPLE Hereinafter, an example of the present invention will be explained with reference to the drawings. An example of the present invention is shown in Figure 1 and B. As shown in Figure 1, high-purity aluminum foil was The anode foil and the cathode foil, which have been electrochemically roughened to form a dielectric oxide film, are wound together with a separator and impregnated with an electrolytic solution to form the electrolytic capacitor element 3. An electrolytic capacitor element body formed by combining a capacitor and a sealed terminal plate 1 made by laminating an insulator such as a 7enol plate is housed in a cylindrical aluminum case 2 with a bottom.
A sealed terminal plate 1 is inserted into the opening.

Next, as shown in FIG. 1B, a roller 12f that is rotatable at an angle of 3° to 16° with respect to the rotation axis of the head 11 is attached to the head 11 that rotates integrally with the spindle 1o.
Using the built-in processing means, the roller 12 of this processing means is pressed against the periphery of the open end of the case 2 for curling processing, and the tip of the case 2 is sealed with the sealed terminal plate 1.
The finished product is sealed by biting into the elastic body.

Note that 13 is a bearing that rotatably holds the roller 12, and 14 is a snap spring.

As described above, according to the sealing method according to the present invention, as shown in FIG. 1, the bearings 13 of the rollers 12 do not come out on the sides of the case 2 during curling, so all sides of the case 2 other than the curled portion are chucked. Can be curled. That is, it becomes possible to easily manufacture even products with short overall lengths.

Furthermore, since there is no limit to the outer diameter of the bearing 13, by using a bearing with a large load capacity, its life can be significantly extended.

In addition, in order to maintain a constant curl shape, it is necessary for the rounded portion of the roller 12 to accurately contact the case 2, but in the processing method according to the present invention, the roller 12 is always in one direction from the case 2. It is subjected to a thrust load, and even if there is some play in the thrust direction, the curl shape is always constant.

In other words, there is no need to adjust the play of the bearing 13,
Also, as shown in Fig. 1, the roller 1 can be moved only by the snap spring 14.
2 can be retained, and conversion can be done simply by replacement, which can significantly shorten the replacement time.

In addition, since the diameter of the roller 12 is large, the radius of curvature of the contact portion with the case 2 is large, and the contact state is difficult.
Abnormal curl deformation does not occur even if the processing speed is increased. In other words, it is possible to increase the speed of the machine and significantly reduce production costs.

In addition, in this method, since the roller 12 is inclined from the axial center, the roller 12 is pressed from the outside of the case 2 ft while curling it inward, compared to the conventional method of pressing from the axial direction of the case 2. As a result, variations in curl shape can be reduced and the quality of sealing can be completely stabilized.

Of course, it goes without saying that a sealing body made of only an elastic body such as rubber can be used in the same manner instead of the sealing terminal plate.

Effects of the Invention As described above, according to the present invention, the curling process is performed by tilting the roller with respect to the rotation axis of the head so that it can rotate, and chucks all sides of the aluminum case other than the curled part. Since it can be curled, even products with short overall length can be manufactured easily. That is,
It will also be possible to manufacture products with extremely short overall lengths (case outer diameter > total length), which has not been possible until now.

In addition, the lifespan of the roller bearings has been significantly extended, which reduces the time required for machine repairs.In addition, by adopting a method of holding the rollers using snap springs, the time required to replace and adjust the rollers can be significantly reduced. It becomes possible to speed up the process, improve productivity, and as a result of the above effects, it is possible to significantly reduce production costs.

Further, by employing this method, variations in curl shape can be reduced and the quality of sealing can be stabilized.

As described above, the present invention greatly contributes to the production of short-sized electronic components such as electrolytic capacitors, stabilization of quality, and cost reduction.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views showing steps in a sealing method according to an embodiment of the present invention, and Figures 2 and 2 are cross-sectional views showing steps in a conventional electrolytic capacitor sealing method. ... Sealing terminal board, 2 ... Case, 3
...... Electrolytic capacitor element, 11... Head, 12... Roller, 13... Bearing. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
11-Head 2-Case 12-Roller 3-Electrolytic Container Toko 13°-Head Assong (β) Fig. 1

Claims (2)

[Claims] (1) A processing means is constructed by attaching a rotatable roller inclined with respect to the rotation axis to a head that rotates around the rotation axis, and a sealing body is inserted into the opening of the case containing the component element. After that, a roller of the processing means is pressed against the peripheral edge of the opening end of the case to perform a curling process. (2) Adjust the inclination angle of the roller to the rotation axis from 3° to 15°.
A method for sealing an electronic component according to claim 1.