JPH06163297A - Production of surface mounting coil parts - Google Patents

Abstract

PURPOSE:To realize an inexpensive and dependable surface mounting coil with stable resin formation and terminal shape by molding the surface mounting coil by means of a resin forming metal mold in the shape of a resin forming metal mold and a terminal chip groove section in the shape of a terminal folding shape. CONSTITUTION:A fixed metal mold 3 has projections 3a for folding terminal chip and a terminal chip folding shape is provided on a terminal chip groove 4a of a movable metal mold 4. Then one part of a terminal chip 2a is set to be inserted and molded by a hoop member 2 equipped with a plurality terminal chips 2a which are produced by punching strip metal plates at the constant intervals in the terminal plate resin molding process. The terminal chip 2a is pressed by the terminal chip folding projection 3a of the fixed metal mold 3 by fastening the metal mold and is folded along the folding shape of the terminal chip groove 4a of the movable metal mold 4. Then the surface mounting coil with the stable and accurate terminal folding shape is provided by pouring and hardening the melting resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a surface mounting coil component used in electronic equipment such as various video equipment, audio equipment and communication equipment.

[0002]

2. Description of the Related Art In recent years, electronic parts have been rapidly adapted to the surface mount type, and the number of coil parts is also increasing.

A conventional method for manufacturing a surface mount coil component will be described below. 11 to 15 show a conventional method of manufacturing a surface mount coil component. FIG. 11 shows a terminal plate 7 resin-molded so that a part of the terminal pieces 8a is inserted into a hoop material 8 having a plurality of terminal pieces 8a by punching strip-shaped metal pieces at regular intervals. 7a is a ferrite core coupling surface, 7b is a ferrite positioning protrusion, and 8b is a positioning pilot hole provided in the hoop material 8 for each production step.

In FIG. 14, the resin-molded terminal plate 7 is connected to the ferrite core 9 in a hoop state or in a state of several strips, and the hoop material is dimensioned to require the terminal piece 8a as shown in FIG. It cuts from 8, and separates the terminal board 7. The terminal board 7 in which the terminal 7c cut into the individual pieces is projected,
A protrusion 11a provided on the movable die 11 by installing the terminal bending jig formed on the fixed die 10 and the movable die 11 as shown in FIG. A general method is to manufacture a surface mount coil component in which the terminal 7c is pressed, the terminal 7c is bent, and then the coil is wound around a winding frame.

Further, as shown in FIG. 23, there is also a manufacturing method in which the terminal 7c is bent by punching a strip-shaped metal plate, and then the terminal piece 8a is bent and resin-molded.

[0006]

However, in the method of bending the terminal plate 7 after cutting the terminal plate 7 into individual pieces from the hoop material 8 according to the above-described conventional manufacturing method, the protrusions provided on the movable die 11 of the terminal bending jig. The width of 11a becomes very thin, causing rapid wear and a large change in shape. Alternatively, due to variations in the fixed position of the terminal plate 7, bending of the terminal 7c as shown in FIG. 15 and the bottom surface of the terminal plate 7 and the bottom surface of the terminal should be flush with each other as shown in FIG. The bottom of the terminal 7c is up and down with respect to the bottom, the bent shape is not uniform, the user may obliquely fix the terminal 7c when mounting it on the set board, or the terminal 7c may not be soldered properly. Was spending time on inspection and confirmation as an important management item.

Further, in the manufacturing method in which the terminal piece is bent before the resin molding, the terminal piece 8a is set as shown in FIG. 17 when the hoop material is plated before the resin molding, or when it is set in the resin molding die during transportation. Bends in various directions, the position of the groove for the terminal piece provided in the resin molding die does not match the shape and shape of the die, and the die is damaged, shortening the life of the die and preparing a spare die. I had to leave.

The present invention solves the above-mentioned problems of the prior art, not only by reducing the production process and rationalizing, but also by stabilizing the resin molding,
It is an object of the present invention to provide an inexpensive and highly reliable surface mount coil component having a stable terminal shape, high quality, and the like.

[0009]

In order to achieve this object, a method of manufacturing a coil component for surface mounting according to the present invention includes a resin molding die having a terminal bent shape as well as a terminal plate shape. The terminal plate of the coil component for surface mounting is molded using the same components.

[0010]

By this method, the terminal piece can be bent along the shape of the molding die by the mold clamping pressure of the molding machine in the resin molding process, so that the accuracy is improved, and then the molten resin is injected and cured in this resin molding die. Therefore, a stable terminal shape can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a terminal plate after resin molding in which a part of a terminal piece used for a surface mount coil component in one embodiment of the present invention is inserted, and FIG. 2 is a resin plate before resin molding in one embodiment of the present invention. It is a perspective view of a hoop material.

In FIG. 2, reference numeral 2 denotes a terminal piece 2a formed by punching a band-shaped metal plate at a constant interval with a hoop material and a positioning pilot hole 2b in each production process, and the surface is plated. .

In FIG. 1, reference numeral 1 denotes a resin molded terminal plate, which has a ferrite core coupling surface 1a and a ferrite core coupling positioning protrusion 1b, and a part of the terminal piece 2a of the hoop material 2 is inserted. Moreover, the terminal piece 2a is bent by a resin molding die.

The operation of the above steps will be described with reference to FIGS. First, FIGS. 3 and 4 show the structure of a resin molding die, and the fixed die 3 has a terminal piece bending projection 3a. Further, the movable mold 4 has a terminal piece groove 4a provided with a bent shape of the terminal piece. FIG. 5 shows a state in which the hoop material 2 is set in the movable mold 4, and then the mold clamping shown in FIG. 6 is performed. At that time, the terminal piece 2a is bent by the clamping pressure so that the terminal piece bending groove of the fixed mold 3 is bent. After being bent along 4a, molten resin is injected into the mold.

In FIG. 7, the movable mold 4 is opened and the resin molded product in which a part of the terminal piece 2a is inserted is taken out. After that, in the hoop state or in the state of several strips, as shown in FIG.
9 is bonded to the ferrite core coupling surface 1a of FIG. 2 with an adhesive agent or the like, and the terminal piece 2a of the hoop material 2 is cut to a required size as shown in FIG. The terminal board 1 is made. After that, the coil 6 is wound around the ferrite core 5 which is a winding frame to form a surface mounting coil component, which is shown in FIG.

As a comparison between the resin molding die according to the present embodiment and the conventional resin molding die, FIGS. 18 and 19 show a fixed mold 12 in the case where the conventional hoop material terminal piece is not bent. 22 shows the movable mold 13, and only the groove 13a along the terminal piece 8a of the hoop material 8 is provided in the movable mold 13, and the mold clamped state in the resin molding process is shown in FIG. .

As another conventional example, in the case of using the hoop member 8 of the bent terminal piece 8a of FIG.
0, FIG. 21, and FIG. 24, when the mold is clamped, the terminal piece 8
The movable die 15 is only provided with a relief groove 15b for the bent portion of the terminal piece 8a so that a is not deformed.

As described above, according to this embodiment, the terminal piece 2 in which the terminal 1c of the surface mounting coil component is provided on the hoop material 2 is provided.
When the terminal plate 1 is resin-molded in the state a, the terminal piece 2a is bent by a resin molding die, and a part of the terminal piece 2a is insert-resin-molded to reduce the number of steps in the bending process of the terminal 1c and rationalize the resin. It is possible to provide an inexpensive and highly reliable surface mounting coil component such as stable molding, stable terminal shape, stable resin molding, and long life of the mold.

[0019]

As described above, according to the present invention, the number of man-hours in the terminal bending step is reduced and the terminal shape can be reduced by providing the resin mold with the same terminal bending shape in the terminal piece groove as in the terminal plate shape. It is possible to provide a low cost and highly reliable surface mounting coil component such as stable resin molding, stable resin molding, and long mold life.

[Brief description of drawings]

FIG. 1 is a perspective view of a terminal board in a method of manufacturing a surface mount coil component according to an embodiment of the present invention.

FIG. 2 is a perspective view of a hoop member according to an embodiment of the present invention.

FIG. 3 is a perspective view of a resin molding fixed mold for explaining the operation in one embodiment of the present invention.

FIG. 4 is a perspective view of a resin molding movable mold for explaining the operation in one embodiment of the present invention.

FIG. 5 is a sectional view of a hoop material set state for explaining the operation of the terminal board resin molding process in one embodiment of the present invention.

FIG. 6 is a cross-sectional view of a mold clamping state for explaining the operation of the terminal plate resin molding step in one embodiment of the present invention.

FIG. 7 is a sectional view of a mold open state for explaining the operation of the terminal plate resin molding step in one embodiment of the present invention.

FIG. 8 is a perspective view of a terminal plate to which a reel ferrite core according to an embodiment of the present invention is connected.

FIG. 9 is a perspective view of a terminal board cut into individual pieces from a hoop material according to an embodiment of the present invention.

FIG. 10 is a perspective view of a surface mounting coil component according to an embodiment of the present invention.

FIG. 11 is a perspective view of a conventional coil component terminal plate.

FIG. 12 is a perspective view after the winding frame ferrite core is coupled to the conventional coil component terminal plate.

FIG. 13 is a perspective view of a conventional coil component terminal plate cut into individual pieces from a hoop material.

FIG. 14 is a front view of a terminal bending process using a conventional coil component terminal plate.

FIG. 15 is a cross-sectional view of a terminal plate in which a terminal is bent by a conventional coil component.

FIG. 16 is a cross-sectional view showing a defective state of a terminal shape in a terminal plate in which a terminal of a conventional coil component is bent.

FIG. 17 is a perspective view of a hoop material terminal showing a defective state of a terminal piece in a conventional coil component.

FIG. 18 is a perspective view showing a general resin molding fixed mold for a conventional coil component.

FIG. 19 is a perspective view showing a general resin molding movable mold for a conventional coil component.

FIG. 20 is a perspective view showing a resin molding fixing die of another method for a conventional coil component.

FIG. 21 is a perspective view showing a resin-molded movable die of a conventional coil component by another method.

FIG. 22 is a cross-sectional view of a mold clamping state for explaining a general resin molding process operation in a conventional coil component.

FIG. 23 is a perspective view of a hoop member showing a defective state of a terminal piece of another method in a conventional coil component.

FIG. 24 is a cross-sectional view of a conventional coil component in a mold clamping state for explaining an operation of a resin molding process of another method.

[Explanation of symbols]

 1 Terminal Plate 1a Ferrite Core Coupling Surface 1b Ferrite Core Coupling Positioning Protrusion 2 Hoop Material 2a Terminal Piece 2b Pilot Hole 2c Terminal 3 Resin Molding Fixed Mold 3a Terminal Piece Bending Protrusion 3b Pilot Pin 4 Resin Molding Movable Mold 4a For Terminal Piece Groove 5 Ferrite core 6 Coil

Claims (1)

[Claims] 1. A band-shaped metal plate is punched out at regular intervals and a hoop material having a plurality of terminal pieces is set in a resin molding die,
The terminal piece is bent by the mold clamping pressure of this resin molding die, and then molten resin is injected into the resin molding die to insert a part of the terminal piece into a terminal plate or a terminal integrated with the bobbin. The board is molded with resin, the coil winding frame with a ferrite core is joined to the terminal board taken out from the resin molding die, or the bobbin integrated terminal board taken out from the resin molding die is cut into individual pieces from the hoop material, and the above ferrite core Alternatively, a method of manufacturing a coil component for surface mounting in which a bobbin is wound.