JPS63278313A - Adhesion method of drum core - Google Patents

Abstract

PURPOSE:To obtain right adhesion coupling and to prevent defective adhesion, by coating upper surfaces of terminal plates with an adhesive and pressing head parts of drum cores mounted on the terminal plates, by means of a heat resisting sponge with a metallic plate on its rear surface, and drying and hardening the adhesive. CONSTITUTION:Upper surfaces of terminal plates 11 are coated with an adhesive to couple drum cores 14 thereon. The drum cores 14 are mounted on the upper surfaces of these terminal plates 11, and head parts of the drum cores are pressed by a metallic plate 19 made of stainless steel or the like of 0.15 mm or less in thickness, stuck on a rear surface of a heat-resisting sponge 18 such as silicon mounted on a rear surface of a front part of a frame 17 mounted on an upper part of an axis 16 energized downwards at all times by a spring 15 assembled in a pallet 12 so as to be movable up and down. In succession the adhesive is softened and then it is heated to be dried and hardened until its temperature attains up to the one for hardening, so that the drum cores 14 are adhered and coupled to the terminal plates 11. Even if the drum cores are disposed on their inclined states, they are modified in their inclination so that they are adhered and coupled. Accordingly stable quality can be obtained by the adhesion.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a drum core bonding method for bonding a drum core of an inductance component used in various electronic devices to a terminal plate.

Conventional technology Conventional methods for adhesively bonding drum cores used in inductance components to terminal boards include applying adhesive to the top surface of the terminal board, placing the drum core on top of it, and allowing the adhesive to dry and harden. When the adhesive softens during curing, methods such as pressing the drum core against the terminal board side and then curing the adhesive were used.

However, with these methods, the drum core may tilt due to the foaming of air bubbles in the adhesive while it is drying.
There were problems in that the product often got stuck, the quality was not stable, and many defective products were produced.

For this reason, conventionally, as shown in FIGS. 3 and 4, a pallet 2 holding a plurality of terminal boards 1 is provided with a shaft 4 that is always urged downward by a spring 3. , a frame 6 is provided at the upper end of this shaft 4, a heat-resistant sponge 6 is attached to the lower surface of this frame 5, and this sponge is placed on the terminal board 1 with an adhesive interposed therebetween to form a drum core 7.
The method used was to press down on the head of the machine and let the adhesive dry and harden.

Problems to be Solved by the Invention However, even in the above method, when the drum core 7 is supplied onto the terminal plate 1 with an angle of θ0 as shown in FIG. 5, the sponge 6 deforms sharply and holds the drum core 7. However, there was a problem in that the drum core 7 was adhesively bonded to the terminal plate 1 without correcting the inclination of the drum core 7, resulting in a product that could not be put to practical use.

The present invention eliminates the above-mentioned drawbacks of the conventional drum core, and provides a method for adhering a drum core so that even if the drum core is placed on the terminal board at an angle, the inclination can be corrected and the drum core can be bonded to the terminal board. This is what we are trying to provide.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has developed a heat-resistant structure in which an adhesive is applied on the terminal board, and a metal plate is provided on the underside of the head of the drum core placed on the terminal board. This method involves drying and hardening the adhesive while pressing it with a sponge.

By using the method described above, even if the drum core is placed on the terminal plate at an angle, the inclination of the drum core will be corrected by the metal plate provided on the bottom surface of the sponge and the drum core will be bonded correctly. Adhesion can be prevented.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, FIGS. 1 and 2.

In FIGS. 1 and 2, a plurality of terminal boards 11 having a plurality of terminals 10 implanted therein are arranged on a rail-shaped terminal board holding portion 13 formed on a part of the upper surface of a pallet 12. An adhesive for bonding the drum core 14 is applied to the upper surface of the drum core 11.

A drum core 14 is arranged on the upper surface of this terminal plate 11,
The head of the drum core 14 is made of heat-resistant material such as silicone, which is attached to the lower surface of the front part of a frame 17 attached to the upper part of a shaft 16 that is vertically movably incorporated into the pallet 12 and always urged downward by a spring 16. sexual sponge 18
It is pressed by a metal plate 19 made of stainless steel or the like with a thickness of 0.151 ff or less attached to the lower surface of the .

In this state, the adhesive used is softened and then heated to a temperature at which it hardens and is dried to harden the adhesive, thereby adhesively bonding the drum core 14 to the terminal plate 11.

The drum core 14 connected to the terminal plate 11 in this way is wound with a wire, and both ends of the winding are connected to the terminal 10.
The winding portion including the drum core 14 is externally molded to form a fixed inductor, and the winding portion is covered with a cap core and an external case to form a variable inductor.

Note that when the drum core 14 is arranged obliquely on the terminal plate 11 in the above-described manner, the portion of the drum core 14 that contacts the metal plate 19 is
Because it is urged by the elastic force of 6, the metal plate 19 is slid.
The head of the drum core 14 is modified so that it is in surface contact with the metal plate 19.

Therefore, with the drum core 14 tilted, the terminal plate 1
Even if the drum core 14 is arranged on the terminal board 1, the inclination must be corrected, and it is possible to completely prevent the drum core 14 from being connected to the terminal board 11 in an inclined state. This is due to the fact that the metal plate 1.9 with a small coefficient of friction is arranged on the lower surface of the sponge 18 to make the drum core 14 slippery.

As described above, according to the drum core adhesion method of the present invention,
Since the head of the drum core is pressed by a thin metal plate provided on the underside of the sponge, even if the drum core is placed in an inclined position, the inclination of the drum core is corrected and bonded with adhesive, resulting in extremely high quality. It is of great industrial value because it has the effects of being stable, free of defective products, and extremely economical.

[Brief explanation of the drawing]

1 and 2 are a front view and a side view of a drying process showing an embodiment of the drum core adhesion method of the present invention, and FIGS. 3 and 4 are a front view and a side view showing a conventional drum core adhesion method. figure,
FIG. 6 is a front view showing a conventional disadvantageous state. 1o...Terminal, 11...Terminal board, 12
・River...Pallet, 13...Terminal board holding part, 1
4...Drum core, 15...Spring, 16...Shaft, 17...Frame,
18...Sponge, 19.River...Metal plate. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] Adhesive is applied to a terminal board placed on a pallet, a drum core is placed on top of this terminal board, and the head of this drum core is pressed with a heat-resistant sponge with a thin metal plate attached to the bottom surface while drying and the adhesive is applied. A method of adhering the drum core by curing it and joining it to the terminal board.