JPH0831289A - Manufacture of movable block - Google Patents

Abstract

PURPOSE:To manufacture a compact movable block with high productivity, high assembly accuracy, and large degree of freedom in design. CONSTITUTION:Moving contact pieces 21, 21 formed in a lead frame 20 are positioned in parallel on both sides of a hoop material 10 for forming a moving iron piece 11. The moving iron piece 11 in the hoop material 10 and the moving contact pieces 21, 21 in the lead frame 20 are insert-molded in an insulating stand 30. The moving iron piece 11 and the moving contact pieces 21 are cut off from the hoop material 10 and the lead frame 20 respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a movable block used in an electromagnetic relay.

[0002]

2. Description of the Related Art Conventionally, as a movable block used in an electromagnetic relay, for example, as shown in FIGS.
There is a movable block 4 formed by arranging plated movable iron pieces 1 in parallel between a pair of movable contact pieces 2 and 2 formed on a lead frame (not shown) and insert-molding these on an insulating base 3.

[0003]

However, in the above-mentioned movable block 4, the plated movable iron piece 1 must be individually positioned between the pair of movable contact pieces 2 and 2 formed on the lead frame. , It takes time to position and productivity is low. In particular, when the movable iron piece 1 becomes smaller as the size of the apparatus becomes smaller, the holding allowance of the movable iron piece 1 also becomes smaller, which makes positioning even more difficult. For this reason, not only is it difficult to perform positioning with high accuracy, but it is also necessary to design in consideration of the gripping margin, so the degree of freedom in design is small.

Further, in the plating operation of the movable iron piece 1, the movable iron pieces 1 are individually immersed in the plating tank to perform plating. However, the plating conditions are slightly different depending on the position of immersion, and the thickness of the plating layer varies. Is likely to occur, and the dimensional accuracy of the movable iron piece 1 is low. In particular, when the movable iron pieces 1 overlap and stick to each other in the plating tank, it becomes even more difficult to perform uniform plating. Therefore, the movable iron piece 1 is also provided with a protrusion so that the movable iron pieces 1 do not stick to each other, but this method has a problem that the number of production steps is increased and the productivity is further reduced. is there.

In view of the above problems, it is an object of the present invention to provide a movable block manufacturing method capable of manufacturing a small movable block which has high productivity, high assembly accuracy, and a large degree of freedom in design.

[0006]

In order to achieve the above-mentioned object, a method of manufacturing a movable block according to the present invention comprises arranging a movable contact piece formed on a lead frame in parallel on at least one side of a hoop material forming a movable iron piece. A positioning step of positioning the movable hoop material and a molding step of integrally molding the movable iron piece of the hoop material and the movable contact piece of the lead frame, which are arranged in parallel, with an insulating material.
The step of separating the movable iron piece and the movable contact piece from the hoop material and the lead frame, respectively. Before the molding step, the hoop material may be provided with a retaining hole for filling a molding resin material, and the hoop material has narrow cutting connecting portions at predetermined intervals. Good.

[0007]

Therefore, according to the first aspect of the present invention, if the movable contact pieces formed on the lead frame are arranged side by side on at least one side of the hoop material forming the movable iron piece, the positioning is performed.
There is no need to individually position the movable iron pieces as in the conventional example. According to the second aspect, the molding resin material is filled in the retaining hole formed in the hoop material forming the movable iron piece in the molding step. Further, according to claim 3,
By cutting the narrow cutting connecting portion, the movable iron piece can be obtained from the continuous hoop material.

[0008]

Embodiments of the present invention will now be described with reference to the accompanying drawings of FIGS. As shown in FIGS. 1 to 5, the method of manufacturing the movable block according to the first embodiment includes a positioning step, a retaining step, a molding step, and a separating step.

The positioning step is a step of positioning the lead frame 20 material forming the movable contact piece 21 and the hoop material 10 forming the movable iron piece 11 in parallel. The lead frame 20 forming the movable contact piece 21 is formed by punching out a thin strip-shaped conductive material, and the edge portions 22 and 22 on both sides formed after punching are left, and the edge portion 2
It is in the shape of a ladder consisting of a connecting portion 23 formed by punching out so as to bridge between the edge portions 22, 22.
A pair of movable contact pieces 21 and 21 are integrally formed by punching and leaving them in a frame surrounded by and the connecting portions 23 and 23.

The movable contact piece 21 is integrally formed so as to be bridged over the connecting portion 23 by leaving the both end portions punched out. Then, the movable contact piece 21
Has the movable contacts 25, 25 fixed to each other with thin grooves 24 provided at both end portions thereof, and is punched out so as to extend from the outer center portion thereof, thereby forming a substantially T-shaped connection in plan view. The portion 26 is formed integrally with the edge portion 22.

The hoop material 10 forming the movable iron piece 11 is
It is a long material with a rectangular cross section, and its surface is plated.

Then, the lead frame 20 in which the movable contact piece 21 is formed on the hoop material 10 forming the movable iron piece 11 is formed.
Are placed and positioned so that their center lines overlap with each other, and then the retaining holes 12 are provided at predetermined positions of the hoop material 10.
(FIG. 1), and then the movable contact piece 21 and the hoop material 10 are integrated with the insulating base 30 by insert molding (FIG. 2). The retaining hole 12 may be a through hole or may be a simple recess.

According to the present embodiment, since the molding resin material forming the insulating base 30 is partially filled in the retaining holes 12 in the molding process, the movable iron piece 11 does not fall off the insulating base 30. In addition, since the retaining hole 12 is not formed in advance before positioning, but the retaining hole 12 is formed immediately before molding, there is an advantage that a positional deviation due to an integration error can be avoided.

Then, the connecting portions 23, 23 located at both end portions of the movable contact piece 21 are cut off, and at the same time, the narrow groove 24 is formed.
A twin contact structure is formed by cutting one end of the movable iron piece 11 by cutting the hoop material 10 in a predetermined length dimension (FIG. 3). Further, the connecting portion 26 of the movable contact piece 21 is connected to the edge portion 2 of the lead frame 20.
The movable block is completed by separating it from 2. (FIG. 4).

In the above-described first embodiment, the case where the movable block is formed by the movable iron piece 11 made of the hoop material 10 having a uniform width has been described, but the invention is not limited to this. For example, the second shown in FIG. As in the embodiment, the hoop material 10 in which the narrow cutting connecting portions 13 are provided at a predetermined pitch may be used. According to this embodiment, the narrow connecting portion 13 for cutting is used.
Is provided, there is an advantage that the cutting operation becomes easy when the movable iron piece 11 is cut out from the hoop material 10 after molding.

[0016]

As is apparent from the above description, according to claim 1 of the present invention, the movable contact piece formed on the lead frame is arranged on at least one side of the long hoop material forming the movable iron piece. The movable block of the electromagnetic relay can be manufactured by arranging and positioning, and integrally molding these with an insulating material, and then cutting out the movable iron piece and the movable contact piece from the hoop material and the lead frame, respectively. Therefore, it is not necessary to position the movable iron pieces individually,
Positioning is easy and productivity is improved.
Also, since it is not necessary to position the movable iron pieces individually,
The movable iron piece is not required to be gripped, the shape of the movable iron piece is small and simple, the degree of freedom in design is expanded, and a small movable block is obtained. Furthermore, even when assembling the plated movable iron pieces, it is not necessary to individually plate the movable iron pieces, and the long hoop material that forms the movable iron pieces can be immersed in the plating tank and continuously plated. The layer thickness becomes uniform, and the dimensional accuracy of the movable iron piece is improved. In particular, the movable iron pieces do not stick to each other as in the case where the cut-out movable iron pieces are individually immersed in the plating tank for plating as in the conventional example. Therefore, unlike the conventional example, it is not necessary to provide a protrusion or the like on the cut out movable iron piece, the number of production steps is reduced, and the productivity is further improved. According to the second aspect, before the movable iron piece and the movable contact piece are integrally molded, the hoop material forming the movable iron piece is provided with the retaining hole for filling the molding resin material. Therefore, the retaining hole is provided in advance. It is possible to avoid the positional deviation due to the integration error that occurs when the hoop material is used. According to the third aspect, since the movable iron piece is obtained from the continuous hoop material by cutting the narrow connecting portion for cutting, there is an effect that the cutting work for cutting out the movable iron piece becomes easy.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a method of manufacturing a movable block according to the present invention.

FIG. 2 is a perspective view showing a state after the hoop material and the lead frame of FIG. 1 are insert-molded.

FIG. 3 is a perspective view showing a state where both end portions of the movable contact piece are separated from the lead frame.

FIG. 4 is a perspective view showing a state in which a connecting portion of a movable contact piece is separated from a lead frame.

5 is a perspective view of the state after insert molding of the hoop material and the lead frame of FIG. 1 as viewed from different angles.

FIG. 6 is a perspective view showing a second embodiment of the method of manufacturing a movable block according to the present invention.

FIG. 7 is an exploded perspective view for explaining a method of manufacturing a movable block according to a conventional example.

8 is a perspective view showing a state after the movable iron piece and the movable contact piece of FIG. 7 are insert-molded on an insulating base.

[Explanation of symbols]

10 ... hoop material, 11 ... movable iron piece, 12 ... retaining hole,
13 ... Narrow part for cutting, 20 ... Lead frame, 21 ... Movable contact piece, 22 ... Edge part, 23 ... Connection part, 24 ... Fine groove, 2
5 ... movable contact, 26 ... connection part.

Claims (3)

[Claims] 1. A positioning step of arranging and arranging a movable contact piece formed on a lead frame on at least one side of a hoop material forming the movable iron piece, and the movable iron piece of the hoop material and the movable contact piece of the lead frame arranged in parallel. A method of manufacturing a movable block, comprising: a molding step of integrally molding the above with an insulating material; and a separation step of separating the movable iron piece and the movable contact piece from the hoop material and the lead frame, respectively. 2. A positioning step of arranging and positioning a movable contact piece formed on a lead frame on at least one side of a hoop material forming a movable iron piece, and a retaining hole for filling the hoop material with a molding resin material. A retaining step to be provided,
It is characterized by comprising a molding step of integrally molding the movable iron piece of the hoop material and the movable contact piece of the lead frame, which are arranged in parallel, with an insulating material, and a separating step of separating the movable iron piece and the movable contact piece from the hoop material and the lead frame, respectively. Method for manufacturing movable block. 3. The method for manufacturing a movable block according to claim 1, wherein the hoop material has narrow portions for cutting at predetermined intervals.