JP2939606B2 - Metal insert resin molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal insert for molding all or a part of a metal circuit wire, a metal terminal, a metal piece, a mounting metal, etc. (hereinafter collectively referred to as a metal plate) in resin. The resin molding method is an effective technique particularly for plastic sealing products of electric circuits.

[0002]

2. Description of the Related Art In a conventional metal insert resin molding method,
Circuit conductor metal parts that must not be electrically conductive are manufactured as separated metal parts from the beginning, manually placed in predetermined positions in the mold, and then plastic resin is poured to seal the metal parts It is integrally formed so as to perform. In the conventional metal insert resin molding method, each metal part that is electrically insulated is manufactured as a separate metal part and is arranged individually in the mold, so that the number of metal parts increases, and the arrangement in the mold is also increased. Work was troublesome and the arrangement position tended to be incorrect. As described in the example of plastic sealing of electric circuits, multiple metal parts are heated and
A similar problem has been encountered in the case of a metal insert resin molding method that requires separate encapsulation due to vibration and strength problems.

[0003]

The problem to be solved by the present invention is to solve these conventional problems, to reduce the number of metal parts, to speed up the sealing in the mold, and to reduce the number of manufacturing steps. Another object of the present invention is to provide a metal insert resin molding method in which production can be easily automated and the production cost can be reduced.

[0004]

The gist of the present invention that solves the above-mentioned problem is that a metal plate of a required shape integrally connected by a thin connecting portion is placed in a pair of dies, and the dies are pressed. While holding the metal plate in the mold, the cutting blade is pushed out from the inside of the mold to cut and separate the thin connecting part of the metal plate inside the cavity where the resin of the mold is sealed , and then molding A metal insert resin molding method is characterized in that a resin is poured into a mold and a metal plate is sealed in a cut and separated state . The pushing direction of the cutting blade of the present invention includes a vertical direction, a horizontal direction, and an oblique direction, and the direction is appropriately selected.

[0005]

According to the present invention, metal parts which need to be separated for electrical, thermal, vibration, strength, etc. are connected through thin connecting parts to produce an integrated metal plate (FIG. 4). reference). By connecting, the number of parts of the metal plate to be manufactured can be reduced. Next, the connected metal plate is arranged at a predetermined position in the mold. In this operation, the number of parts is small and the size of the parts is large, so that the arrangement can be easily and quickly performed (see FIGS. 1A and 2). Thereafter, the metal plate is pressed and clamped by a pair of dies. Next, the cutting blade incorporated in the mold is pushed into the thin connecting portion of the metal plate to cut the connecting portion and separate it so as not to contact (see FIG. 1C). After cutting and separating, a molding resin is poured into a mold to integrally mold the metal plate and the plastic.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The present invention is an example applied to the manufacture of a housing of an electric product in which a terminal is sealed in a resin for waterproofing. FIG.
FIG. 2 is an explanatory view showing the operation of the process of the embodiment of the present invention, FIG. 2 is a process diagram of the embodiment, FIG. 3 is a plan view showing a terminal product at the stage of the stamping process, and FIG. 5 is a bottom view of the upper mold, and FIG. 6 is a plan view of the lower mold.

In the figure, 1 is a terminal which is a metal plate,
3, 4 are conductors of each terminal of the terminal 1, 5, 6, 7 are connecting parts for connecting the conductors, 8 is a stamping step product stamped with a plurality of terminals 1 connected, 9 is The mounting portion of the terminal 1 of the same product, 10 is a pin hole for positioning of the terminal 1, 11 is a lower die, 12 is an upper die, 13 is a cutting blade, 14 is a cylindrical guide for guiding the cutting blade, and 15 is a cylindrical guide. An inclined piece 16 attached to the lower end of the cutting blade 13;
Is a slide piece that slides on the inclined surface of the inclined piece, 17 is a cylindrical die on the upper mold 12 side, 18 is a slider, 19 is a cavity of the upper mold 12, 20 is a cavity of the lower mold 11, 21 Is a resin.

In this embodiment, the terminal 1 shown in FIG.
Are cut off, and the terminals 1 shown in FIG. 4 are taken out. First, the terminal 1 taken out is placed at a predetermined position of the lower mold 11 (see FIGS. 1A, 2A and 2B). The terminal 1 is placed on a projecting guide 14 of the lower mold 11. At this time, the positioning is performed accurately by the positioning pin holes 10. Next, the upper mold 12 is lowered and the terminal 1
Is pressed and held between the die 17 of the upper mold 12 and the guide 14 of the lower mold 11.

Then, the slide piece 1 on the lower mold 11 side
6 is moved horizontally, the inclined piece 15 is pushed up, and the cutting blade 1 is moved.
3 is raised along the guide 14, and the connecting portions 5, 6, 7 of the terminal 1 are cut off (FIG. 1 (c), FIG. 2).
(C)). By being cut, the conductors 2, 3, and 4 of the terminal 1 are separated and electrically insulated.

After cutting, the die 17 is retracted into the upper mold 12 while pouring the resin into the cavities 19 and 20 of the upper mold 12 and the lower mold 11, and the terminal 1 is integrated so as to be sealed in the resin. Things. The terminal 1 (part of each of the conductors 2, 3, and 4) is exposed outside the cavity and is not covered with the resin (see FIGS. 1D and 2C). As a result, a housing product is completed in which the conductors 2, 3, and 4 are partially exposed to the outside and sealed in resin.

As can be seen from this embodiment, one of the terminals 1 can seal three metal parts of the conductors 2, 3, and 4, and the number of parts and the number of times of setting the parts are large. It can be reduced in width and can be loaded quickly and accurately. In addition, since the support pins of the terminals are moved and formed during the molding, a product suitable for the purpose of waterproofing can be obtained.

[0012]

As described above, according to the present invention, a plurality of conventional metal parts are connected, arranged as one part in a mold, and divided in the mold, so that the number of parts can be reduced. In addition, the loading operation of metal parts can be performed quickly and accurately. This facilitated molding automation. Also, efficient production of parts is enabled.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an operation of a process of an embodiment of the present invention.

FIG. 2 is a process chart of an example.

FIG. 3 is a plan view showing a terminal product at a stage of a stamping process.

FIG. 4 is a plan view showing individually separated terminals after a stamping step.

FIG. 5 is a bottom view of the upper mold of the embodiment.

FIG. 6 is a plan view of a lower mold of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Terminal 2 Conductor part 3 Conductor part 4 Conductor part 5 Connecting part 6 Connecting part 7 Connecting part 8 Product 11 Lower mold 12 Upper mold 13 Cutting blade 14 Guide 17 Die

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-43525 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29C 39/00-39/44 H01L 21 / 56

Claims (1)

(57) [Claims] 1. A metal plate of a required shape integrally connected by a thin connecting portion is placed in a pair of dies, and the dies are pressed and cut from the inside of the dies while the metal plate is held between the dies. The blade is pushed out to cut and separate the thin connecting part of the metal plate inside the cavity where the resin of the mold is sealed , and then the molding resin is poured into the mold and the metal plate is cut and separated. A metal insert resin molding method characterized by sealing.