JP3669313B2 - Manufacturing method of injection molded terminal block - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing an injection molded terminal block, and more particularly to a method of manufacturing an injection molded terminal block used as a wiring component for connecting a motor winding and an external lead wire.
[0002]
[Prior art]
In general, an injection-molded terminal block is known as a wiring component for connecting a motor winding and an external lead wire.
[0003]
The shape of this injection molded terminal block is determined by the structure of the motor, and is formed, for example, in a ring shape.
[0004]
As shown in FIG. 4, the ring-shaped injection-molded resin pedestal is a shape product in which a substantially planar ring-shaped lead frame 1 is laminated in a plurality of stages at appropriate intervals and integrally molded with resin.
[0005]
For example, when forming a lead frame having a diameter D, the injection molded terminal block is manufactured by punching a square plate p having a length D on one side with a desired shape as shown in FIG. At the same time, a part of each lead frame 1 is bent to form a holding portion 2, and the lead frames 1 are overlapped and pressed by a press pin provided on a mold for resin molding. The holding part 2 is held at the intervals described above, and in this state, resin is injected into the mold and molded integrally.
[0006]
In this resin molding, the lead frame 1 is partially laminated differently from two to four layers in order to prevent the holding portions 2 of the lead frames 1 from overlapping in the axial direction depending on the type of motor connection. Yes.
[0007]
[Problems to be solved by the invention]
By the way, in the conventional method of manufacturing an injection-molded terminal block, in order to insulate the lead frames 1 from each other, a resin material is inserted between the respective layers (intervals of the lead frames 1) to fill the intervals. It is necessary to secure an insulation distance. Further, it is necessary to hold the lead frames 1 of each phase at a sufficiently constant interval so that the lead frames 1 of each phase do not come into contact with each other at the resin pressure at the time of resin molding.
[0008]
For this reason, in the conventional method of manufacturing an injection-molded terminal block, the insulation distance between the lead frames 1 is maintained by sandwiching the lead frame 1 from above and below with a pressing pin of a mold.
[0009]
However, in the conventional injection molding terminal block manufacturing method, the 3rd and 4th layer portions of the lead frame 1 are arranged so as not to overlap the other layers, so that the mold shape for resin molding is complicated. In some cases, molding becomes difficult.
[0010]
As a countermeasure against this, there is a method of manufacturing an insulating separator separately from this injection molded terminal block and fitting it between the respective layers. However, since the lead frame 1 is formed in a flat shape, the strength in the stacking direction is weak. Therefore, the insulating separator must be formed over almost the entire surface between the lead frames 1, and a large production preparation is required.
[0011]
Further, when manufacturing an injection molded terminal block having a ring shape, as shown in FIG. 5, a metal square plate p having a length D is formed by press punching to form the ring-shaped lead frame 1. Therefore, the circular portion c formed inside the inner diameter of the lead frame and the plate material of the corner portions s formed at the four corners of the lead frame material become waste materials, resulting in a very poor yield, which is a factor of an increase in price. It was.
[0012]
Therefore, the object of the present invention is that it can be manufactured by a series of operations, and the processing cost of the lead frame can be reduced and the yield can be improved to greatly reduce the manufacturing processing cost. Furthermore, the mold structure is simple and the mold manufacturing cost is reduced. Is to provide a method of manufacturing an injection-molded terminal block that is greatly reduced in cost.
[0013]
[Means for Solving the Problems]
Method of manufacturing an injection molding the terminal block according to the present invention for solving the above problems, a plurality form the tape-shaped lead frame by stamping a Nagashakumaki metal plate strip body, connected to the plurality of lead frames The terminals are formed by bending, and the plurality of lead frames are arranged vertically and arranged in a substantially concentric shape, and are arranged in the mold in a state where the insulation distance of each of the plurality of lead frames is secured by a grooved spacer. The resin is integrally molded in the mold so that only the connection terminals are exposed by injection molding.
[0014]
In the present invention, each lead frame is punched from a long coil of metal strips to form a tape-like lead frame, so that the waste material portion is drastically reduced compared to a circular lead frame and the yield of the metal plate is improved. The injection molded terminal block manufactured according to the present invention can achieve a significant price reduction.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[0016]
FIG. 1 is a perspective view of an injection molded terminal block manufactured by the method of manufacturing an injection molded terminal block according to the present invention.
[0017]
As shown in FIG. 2, the injection molded terminal block is mainly composed of four lead frames 11, 12, 13, and 14 formed in a tape shape.
[0018]
These four lead frames 11, 12, 13, and 14 are vertically arranged on the outermost layer side, the outer layer side, the inner layer side, and the innermost layer side, and an insulating interval is formed between the lead frames 11, 12, 13, and 14. In order to achieve this, for example, the grooved spacers 20 are stacked so as to be sandwiched between three positions that are divided into four equal parts in the circumferential direction when they are arranged substantially concentrically.
[0019]
As shown in FIG. 3, the grooved spacer 20 has a U-shaped interval holding portion 21 that holds the interval between the inner and outer lead frames 11, 12, 13, and 14, and the interval holding portion 21. The spacers 22 are formed between the lead frames 11, 12, 13, and 14 to prevent contact and are formed in a comb shape as a whole. Further, the spacer portion 22 includes a guide portion 22g at the tip thereof for guiding the spacer portion 22 so that the spacer portion 22 can be easily inserted between the lead frames 11, 12, 13, and 14.
[0020]
In addition, a large number of connection terminals 15 are formed on the lead frames 11, 12, 13, 14 of each layer at a predetermined interval. The connection terminal 15 is formed with a U-shaped connection groove 15m for connection to a motor winding or an external lead wire.
[0021]
As shown in FIG. 1, the injection molded terminal block has the lead frames 11, 12, 13, and 14 embedded with the injection molded resin 30 so that only the connection terminals 15 of each phase are exposed from one side. Molded.
[0022]
Next, an embodiment of a method for manufacturing an injection molded terminal block according to the present invention will be described.
[0023]
When the injection molded terminal block shown in FIG. 1 is manufactured, it is punched from a long coil to form, for example, a long wound metal strip having a width of 5 to 20 mm, and this is continuously punched with a press to form an outermost layer. After forming the lead frames 11, 12, 13, and 14 disposed in the layers on the side, outer layer side, inner layer side, and innermost layer side, the contact terminals 15 are formed by progressive feeding.
[0024]
Thereafter, the lead frames 11, 12, 13, and 14 are vertically placed and arranged in a substantially concentric shape. At this time, the spacer portion 22 of the grooved spacer 20 may be inserted between the lead frames 11, 12, 13, and 14. At this time, since the spacer portion 22 is guided by the guide portion 22g, it is easily inserted.
[0025]
In this way, the lead frames 11, 12, 13, and 14 are placed in a mold in a state where each insulation distance is secured (rigidized), and resin molding is performed in the mold by injection molding. Is manufactured.
[0026]
As explained, since the present invention manufactures the lead frames 11, 12, 13, and 14 from the plate body, the amount of waste material is drastically reduced compared to the conventional method of forming and manufacturing a circular lead frame. The yield of the metal plate is improved and the price can be greatly reduced. Further, since the shape of the lead frames 11, 12, 13, and 14 is simple, the lead frame 11, 12, 13, and 14 can be manufactured by a series of operations (progressive molds), the mold structure is simplified, and the mold manufacturing cost is greatly reduced. .
[0027]
In the present embodiment, the method of manufacturing the injection molded terminal block for connecting the winding of the three-phase AC motor and the external lead wire has been described. However, the number of lead frames, the number of connection terminals, and the connection terminals are provided. It goes without saying that the position can be appropriately changed according to the structure of the motor and the type of connection.
[0028]
【The invention's effect】
In short, according to the present invention, since the lead frame is formed from a long and long strip, continuous production is possible (semi-automatic), the processing cost of the lead frame can be reduced, and the yield can be improved. Costs are greatly reduced. Furthermore, since the lead frame has a simple structure, the mold can also be formed in a simple structure, and the mold cost and the molding process cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of an injection molded terminal block manufactured by an injection molded terminal block manufacturing method according to the present invention.
FIG. 2 is a perspective view of a lead frame used in an embodiment of a method for manufacturing an injection molded terminal block according to the present invention.
3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a perspective view of a lead frame used in a conventional method of manufacturing an injection molded terminal block.
FIG. 5 is a view showing a portion that becomes a waste material of a square plate that is a conventional lead frame material;
[Explanation of symbols]
11 to 14 Lead frame 15 Connection terminal 20 Grooved spacer 21 Interval holding portion 22 Spacer portion 30 Injection molding resin

Claims (1)

Multiple forms a tape-shaped lead frame by stamping a Nagashakumaki metal plate strip body, and formed by bending the connection terminal to the plurality of lead frames, generally by vertically a plurality of lead frames Arranged concentrically, placed in a mold with a grooved spacer securing the insulation distance of each of the plurality of lead frames, and integrated into the mold so that only the connection terminals are exposed by injection molding A method for manufacturing an injection-molded terminal block, comprising performing resin molding.

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