JP2595589B2 - Electronic component sealing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for 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 on which a dielectric oxide film has been formed together with a separator, impregnating with an electrolytic solution, and forming an electrolytic capacitor element. The electrolytic capacitor body obtained by combining the bodies was housed in a bottomed cylindrical aluminum case, and the opening end was sealed to obtain a completed product.

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

First, as shown in FIG. 2A, the case 2 to be used already has a protruding portion formed to protrude inward over the entire circumference in the vicinity of the open end, and the electrolytic capacitor element 3 with the sealing terminal plate 1 is mounted on the case 2. Then, the sealing terminal plate 1 is locked to the protrusion. 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 the head 5 that rotates together with the spindle 4, and the tip is sealed at the sealing terminal plate 1. And was sealed by biting into the elastic body.

Problems to be Solved by the Invention The conventional manufacturing method has the following problems.

In the conventional method as shown in FIG. 2, since the bearing 7 of the roller 6 protrudes from the curl portion toward the case 2, the chuck 8 for fixing the case 2 in the case of a product having a short overall length.
It could not be manufactured because the dimensions could not be secured. In addition, the bearing 7 has a small outer diameter due to the necessity of securing the chuck dimensions, and has a small load capacity and a short life.

In addition, in order to keep the curl shape constant, it is necessary that the radius portion of the roller 6 is accurately brought into contact with the case 2 for processing. In order to accurately set the position of the roller 6, the thickness of the gym 9 must be changed when the roller is replaced. It was necessary to make adjustments and eliminate backlash in the thrust direction. In addition, 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 state is poor. Therefore, when the speed of the machine is increased, abnormal deformation occurs in the curl portion. That is, since the speed of the machine is slow and the production efficiency is poor, the production cost cannot be reduced.

In addition, in this method, since the roller 6 presses the case 2 from the axial direction and forcibly curls the case 2 inward, there is a large variation in the curl shape, and the sealing quality is not stable.

The present invention solves such a problem, and in particular, makes it possible to produce a product having a short overall length, and also reduces the production cost by increasing the speed of a machine, and provides an inexpensive product.

Means for Solving the Problems In order to solve this problem, the present invention provides a processing means by attaching a rotatable roller to a head that rotates about a rotation axis while being inclined with respect to the rotation axis. Then, after inserting a sealing body into the opening of the case in which the component elements are stored, the roller of the processing means is pressed against the peripheral edge of the opening end of the case to perform curling.

Operation With this configuration, since the roller bearing of the processing means does not protrude to the side of the case even during curling, the entire side surface of the case other than the curled portion can be chucked to perform the curling process, and even a product with a short overall length can be easily manufactured. It becomes possible.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 1A and 1B show an embodiment of the present invention. As shown in FIG. 1A, an anode foil and a cathode formed by electrochemically roughening a high-purity aluminum foil to form a dielectric oxide film are shown. The foil is wound together with the separator, and the electrolytic solution is impregnated to form the electrolytic capacitor element 3. The electrolytic capacitor element 3 is combined with the sealing terminal plate 1 in which an elastic body such as rubber and an insulator such as a phenol board are bonded. The electrolytic capacitor element body is housed in a bottomed cylindrical aluminum case 2,
The sealing terminal plate 1 is inserted into the opening of the connector.

Next, as shown in FIG. 1B, a roller 11 that is rotatable at an angle of 3 ° to 15 ° with respect to the rotation axis of the head 11 is built in a head 11 that rotates integrally with the spindle 10. Using the processing means attached in this manner, the roller 12 of this processing means is pressed against the peripheral edge of the opening end of the case 2 to perform curling processing, and the tip of the case 2 is sealed by biting into the elastic body of the sealing terminal plate 1. And finished products.

Reference numeral 13 denotes a bearing for rotatably holding the roller 12, and reference numeral 14 denotes a snap spring.

As described above, according to the sealing method of the present invention, since the bearings 13 of the rollers 12 do not protrude to the side of the case 2 during curling as shown in FIG. Can be curled. That is, it is possible to easily manufacture a product having a short overall length.

Also, since the bearing 13 has no limitation on its outer diameter, the use of a bearing having a large load capacity can greatly extend the life thereof. Further, in order to keep the curl shape constant, it is necessary that the round portion of the roller 12 is accurately brought into contact with the case 2 for processing, but in the case of the processing method according to the present invention, the roller 12 is always in one direction from the case 2. And the curl shape is always constant even if there is some backlash in the thrust direction.

That is, the adjustment of the play of the bearing 13 is unnecessary,
Also, as shown in FIG. 1, the roller 12 can be held only by the snap spring 14, and the replacement can be performed only by replacement, so that the replacement time can be greatly reduced.

Also, 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 good.
No abnormal curl deformation occurs even when the processing speed is increased. That is, the speed of the machine can be increased, and the production cost can be significantly reduced.

In addition, in this method, since the roller 12 is inclined from the axis, the roller 12 curls inward while pressing the case 2 from the outside, which is lower than the conventional method of pressing the case 2 from the axis direction. In addition, the variation in the curl shape can be reduced, and the sealing quality can be stabilized.

Of course, it is needless to say that a sealing body composed of only an elastic body such as rubber may be used instead of the sealing terminal plate.

Effect of the Invention As described above, according to the present invention, the curling process is performed so that the roller can be tilted and rotated with respect to the rotation axis of the head, and all sides of the aluminum case other than the curl portion are chucked. Since it can be curled, products with a short overall length can be easily manufactured. That is, it is also possible to manufacture a product having an extremely short overall length (case outer diameter> overall length) which could not be manufactured until now.

In addition, the service life of the roller bearings has been greatly extended, so the repair time of the machine can be shortened, and the adoption of the roller holding method with a snap spring can greatly reduce the time required for roller replacement adjustment. The production speed can be increased, the productivity can be improved, and the production cost can be greatly reduced by the above effects.

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

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

[Brief description of the drawings]

1A and 1B are cross-sectional views showing steps of a sealing method according to an embodiment of the present invention, and FIGS. 2A and 2B are cross-sectional views showing steps of a conventional method of sealing an electrolytic capacitor. 1 ... sealing terminal plate, 2 ... case, 3 ... electrolytic capacitor element, 11 ... head, 12 ... roller, 13 ... bearing.

Claims (2)

(57) [Claims] 1. A processing means is constituted by attaching a roller which is rotatable at an angle to the rotation axis to a head which rotates about a rotation axis, and a sealing body is inserted into an opening of a case accommodating a component element. A method of sealing an electronic component, comprising, after being inserted, curling by pressing a roller of the processing means against a peripheral edge of an opening end of a case. 2. The method according to claim 1, wherein the inclination angle of the roller with respect to the rotation axis is 3 ° to 15 °.