JPH04251719A - Manufacture of terminal block - Google Patents

Abstract

PURPOSE:To keep a molded product not to move in a cavity by the injection of molten resin when a terminal block is manufactured by double insert molding. CONSTITUTION:A recessed and projected section 23 is formed on a contact face with a molded body 15 of a molded product 3A in a mold for carrying out forming, and the recessed and projected section 23 is engaged with the molded body at the time of mold clamping and is fixed in a cavity 21. The molded product is not moved by the injection of molten resin in forming, nor its terminal is bent, nor the dimension accuracy is out of order by said arrangement, and a terminal block of high dimension accuracy can be manufactured.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for manufacturing a terminal block, and in particular, a terminal block is produced by clamping a primary molded body formed by primary molding with a mold and then performing secondary injection molding. The present invention relates to a method for manufacturing a terminal block.

0002

[Prior Art] For example, electronic parts such as switches, in which a plurality of fixed contact parts and movable contact parts are provided in a case so that they can be brought into and out of contact with each other, are manufactured by means of double insert molding. . FIG. 17 is a diagram illustrating a conventional method for manufacturing electronic components by double insert molding, in which 1 is a conductor piece, and a contact portion (not shown) is provided on one end 1a side of the conductor piece.
The other end 1b side serves as an extraction terminal. A primary molded body 2 is attached to the conductor piece 1 by means of primary insert molding, and is loaded into an injection mold to perform secondary insert molding to form a secondary molded body. This secondary molded product and a part of the primary molded product constitute a case.

The injection mold used for this secondary insert molding has an upper mold 19 and a lower mold 20, and a secondary molded product that becomes a case is formed on the parting surface of the upper mold 19 and the lower mold 20. The upper mold 19 has a recess 19a in which the contact portion on the one end 1a side of the conductor piece 1 is accommodated.
The lower die 20 is provided with a recess 20a in which the lead terminal on the other end 1b side of the conductor piece 1 is accommodated. Upper mold 19
The opening area of the lower mold 20 is set smaller than the area of each opposing surface of the primary molded body 2, and
, an upper mold 19 and a lower mold 20 constitute the cavity 21. A molten resin is injected into the cavity 21 and a secondary molded body is insert-molded to surround the primary molded body 2, thereby forming a terminal block having a contact portion inside the case and an extraction terminal protruding from the bottom surface of the case. is manufactured.

0004

[Problems to be Solved by the Invention] FIG. 18 is an explanatory view showing the manufacturing state of a terminal block by the conventional double insert molding described above. When injecting, cavity 2
The primary molded body 2 within 1 may move in the direction of the arrow. That is, if the molten resin injection port is on the left side of the cavity 21, the molten resin will flow to the right (in the direction of the arrow), and the primary molded body 2
Resin pressure is applied in the direction of the arrow, and the primary molded body 2 moves in the direction of the arrow. When the primary molded body 2 moves in this way, as shown in FIG.
The b side abutted against the right wall of the lower die 20 and was bent, which could reduce the dimensional accuracy of the terminal and reduce the performance of the switch.

In this case, during the secondary forming, the die is removed in a direction perpendicular to the cutting direction during the primary forming.
The next formed body 2 is simply held between the upper mold and the lower mold,
In addition, for ease of mounting on the mold, the other end 1 of the conductor piece 1 is
The concave portion 20a of the lower mold 20 into which the mold 20 is inserted needs to have a tapered guide portion on its opening edge, making it difficult to prevent the primary molded body 2 from moving.

The present invention was made in view of the current state of the method of manufacturing terminal blocks by double insert molding as described above, and its purpose is to inject molten resin into the cavity during secondary molding. It is an object of the present invention to provide a method for manufacturing a terminal block in which a primary molded body does not move and a decrease in dimensional accuracy can be prevented.

[0007]

[Means for Solving the Problems] The above object is to create a primary molded product with terminals protruding from the primary molding block by primary molding, and to attach this primary molded product to the parting surface between the upper mold and the lower mold. The mold is clamped with a mold provided with a cavity for molding the secondary molded body, and the secondary mold is integrally molded into the primary molded body by injection molding, thereby creating a terminal block in which the terminal is disposed protrudingly. In the method for manufacturing a terminal block, an uneven portion is provided on a contact surface of at least one of the upper mold or the lower mold with the primary molded body, and the uneven portion is bitten into the primary molded body when the mold is clamped, and the This is achieved by injection molding with the primary molded body fixed.

[0008]

[Operation] When the primary molded product is clamped between the upper mold and the lower mold by the above means, the uneven portion provided on the contact surface of the mold with the primary molded product is brought into contact with the contact surface of the primary molded product. The primary molded body is fixed within the cavity. Therefore, even if a force to move the primary molded product is generated by the molten resin injected into the cavity, the primary molded product will not move. Therefore, the end of the conductor piece 1 protruding from the primary molded product will not bend.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A case in which an embodiment of the present invention is applied to the manufacture of a switch will be described below with reference to the drawings (FIGS. 1 to 16). Here, FIG. 1 is an explanatory diagram of the first hoop material in one embodiment of the present invention, FIG. 2 is an explanatory diagram of the terminal caulking process, FIG. 3 is an explanatory diagram of the primary forming process, and FIG. 4 is an explanatory diagram of the first hoop material obtained in the primary forming. Fig. 5 is an explanatory diagram of the primary molded product inserted into the mold in the secondary molding process, Fig. 6
is an explanatory diagram of the state where the mold is clamped in the secondary molding process, and Figure 7 is Figure 6
FIG. 8 is an explanatory diagram showing the state of FIG. 6 viewed from above; FIG. 9 is an explanatory diagram showing the state in which the insert is in contact with the primary molded product; FIG. 11 is a cross-sectional view taken along the line A-A in FIG. 10, FIG. 12 is a cross-sectional view taken along the line B-B in FIG. 10, FIG. 13 is a cross-sectional view taken along the line C-C in FIG. 10, and FIG. 15 is a cross-sectional view taken along the line DD in FIG. 14, and FIG. 16 is a perspective view showing the structure of a switch manufactured according to an embodiment of the present invention.

First, the structure of a switch manufactured by the method of the embodiment will be explained with reference to FIG. 1 in Figure 16
0 is a switch, and this switch 10 is a fixed contact part 1
1, a movable contact portion 12 and a box-shaped case 13. The fixed contact portion 11 is provided with two protruding fixed contacts 11a, 11a and a terminal 11b pulled out from the bottom surface of the case 13, and the fixed contact portion 11 is provided upright from the inner bottom surface of the case 13. has been done. The movable contact portion 12 has two movable contact pieces 12a, 12a pressed against the two fixed contacts 11a, 11a with a predetermined pressure, respectively.
It is arranged in a direction perpendicular to. In addition, the movable contact piece 12
The proximal ends of the terminals a and 12a are caulked and fixed to the terminals 14 and 14 to be integrated, and these fixed portions are insert-molded by the primary molded body 15. As will be described later, this primary molded body 15 has a movable contact portion 12 and a fixed contact portion 11 integrated as shown in FIG. Case 1
3 is formed into a box shape by a hook portion 15a of this primary molded body 15 and a secondary molded body 16 integrally formed by insert molding with this hook portion 15a.

Although not shown in the drawings, such a switch operates a movable contact piece 12 in conjunction with the operation lever by operating the operation lever.
The tip of a is moved to connect it to the fixed contact.

Next, a method for manufacturing a switch according to an embodiment will be explained.

The movable contact piece 12a of the movable contact 12 is obtained, for example, from a first hoop material 17 shown in FIG. 1 formed by pressing a 0.1 mm plate material. On the other hand, the terminals 14 of the fixed contact part 11 and the movable contact part 12 are, for example, 0.35 m long.
It is obtained from the second hoop material 18 shown in FIG. 2, which is formed by pressing a plate material of m.

First, the first hoop material 17 is cut at a predetermined location to obtain the movable contact pieces 12a, 12a. 12b is a hole for caulking. The movable contact pieces 12a, 12a are placed on the second hoop material 18 as shown in FIG.
The movable contact piece 12a is fixed to the second hoop material 18, that is, the terminal 14, by inserting the caulking protrusions 14a and caulking the tips of the caulking protrusions 14a. During this caulking, the fixed contact 1 of the fixed contact portion 11 of the second hoop material 18
1a is formed in a protruding shape on the side where the movable contact piece 12a is arranged, so that the tip of the movable contact piece 12a is elastically deformed by the protruding fixed contacts 11a, 11a, and the movable contact piece 12a is deformed with a predetermined pressure. The tip end is pressed against the fixed contact 11a, and in this state, the movable contact piece 12a is integrated with the terminal 14 as described above.

As shown in FIG. 2, the second hoop material 18 with the movable contact piece 12a fixed by caulking is conveyed to an injection mold.
Insert molding is performed as shown in FIGS. 2 and 3, and then the ejector pin P is pushed in and removed from the mold, and predetermined parts are cut to remove the fixed contact part 11 and the movable contact part 12 from the second hoop material 18. By cutting, a primary molded product 3A as shown in FIG. 4 is obtained. As shown in FIG. 4, the fixed contact part 11
The movable contact portion 12 is integrated with a primary molded body 15 by insert molding to form a single component.

Note that the relief of the contact portion during the primary molding is formed by the insert 24, as shown in FIG. 25 is the core of the primary mold, and 26 is the cavity of the primary mold.

Next, as shown in FIG. 5, the primary molded product 3A shown in FIG. The mold is clamped and insert molding is performed. This injection mold is the upper mold 1
A cavity 21 for molding the case 13 is provided on the parting surface of the mold 9 and the lower mold 20. The upper mold 19A has a recess 19b for storing the movable contact piece 12a of the primary molded product 3A, etc.
19b is provided, while the lower mold 20A is provided with the primary molded product 3.
Recesses 20b and 20b are provided in which the terminals 11b and 14 of A are accommodated. The opening size of the recess 19a of the upper mold 19A is set smaller than the hook portion 15a of the primary molded body 15. Therefore, the primary molded product 3A is inside the cavity 21.
When the primary molded product 3A is loaded, as shown in FIG.
The recess 19a of the upper mold 19A is closed by the hook 15a to form a cavity that will become the case 13. That is, this cavity is constituted by the upper mold 19A, the lower mold 20A, and the hook portion 15a. Molten resin is injected into the cavity constructed in this manner and insert molding is performed to form the secondary molded body 16. A box-shaped case 13 is integrally formed with this secondary molded body 16 and the hook portion 15a, thereby obtaining the switch 10 shown in FIG. 16.

In this embodiment, the manufacturing method is schematically constructed as described above, and further, the characteristic parts of the present invention will be explained in detail.

FIGS. 14 and 15 show an example of the insert 22, which is attached to an injection mold for performing secondary injection molding.
The recess 19 accommodates the movable contact piece 12a of the next molded product 3A.
b is provided. As mentioned above, the recesses 19b, 19
The movable contact piece 12a of the primary molded product 3A is housed inside b.

FIG. 9 is a plan view of the primary molded product 3A, in which the contact surface 22a of the insert 22 comes into contact with the hook portion 15a at the portion indicated by the dashed line and closes the recess 19b, as shown in the figure. The movable contact piece 12a and the like of the primary molded product 3A loaded into the mold for secondary injection molding are housed in the recess 19b.

The cavity on the lower mold 20A side of the mold for performing secondary injection molding has a serration-like uneven portion 23 on the contact surface with the primary molded product 2 of the primary molded product 3A loaded into the mold.
is molded. FIG. 8 is an explanatory diagram of a mold for performing secondary injection molding, showing a state in which the primary molded product 3A is loaded.
Next, the effect of the uneven portion will be explained.

In this way, 1 is placed in the recess 20b of the lower mold 20A.
The primary molded product 3A is placed in the cavity so as to accommodate the terminals 11b and 14 of the next molded product 3A, and the movable contact piece 12a, etc. of the primary molded product 3A is accommodated in the recess 19b, and the upper mold 19A, and the upper mold 19A and lower mold 20A make 2
The mold for the next injection molding is clamped. By this mold clamping, the uneven portion 23 of the lower mold 20A bites into the primary molded body 15 of the primary molded product 3A, as shown in FIG. 7, and the primary molded product 3A is fixed within the cavity 21. Note that in this embodiment, the uneven portion 23 is provided only on the lower mold 20A, and the uneven portion 23 is provided on the upper mold 19 only.
Since it is not provided in A, this mold clamping does not change the dimensional reference position of the primary molded product, that is, the cavity of the upper mold 19A serves as the reference surface, and the uneven portion 23 is formed on the primary molded product 15. It is designed so that it bites in. Therefore, during mold clamping, the reference position is secured at the contact surface between the upper mold 19A and the primary molded body 15 of the primary molded product 3A, and the dimensional accuracy of the contact part side set during the primary molding is determined during mold clamping. It doesn't go crazy.

With the mold clamped in this manner, molten resin is injected into the cavity 21 of the mold and insert molding is performed to form a secondary molded body 16, and this secondary molded body 16 and the primary molded A box-shaped case 13 is formed by the hook portion 15a of the body 15.
are integrally molded to obtain a switch 10 as shown in FIG. 16, the construction of which has already been shown. In this case, since the primary molded body 15 is fixed by the uneven portions 23, even if the resin pressure mentioned above is applied due to the injection of molten resin, the cavity 21
The primary molded product 3A does not move within the switch 10, the conductor piece of the primary molded product 3A does not bend, and the dimensional accuracy of the switch 10 does not deteriorate. According to this embodiment, the switch 10 with high dimensional accuracy can be manufactured by preventing the primary molded product 3A from moving within the cavity 21 during secondary injection molding using this simple method.

[0024] In the above embodiment, a case was described in which an uneven portion was formed on the contact surface between the lower mold and the primary molded body, but the present invention is not limited to the above embodiment; It may be formed only on the contact surface of the upper mold with the primary molded body, or it may be formed on both the upper mold and the lower mold.

[0025]

[Effects of the Invention] As explained above, according to the present invention,
The uneven parts of the mold bite into the primary molded object during mold clamping, preventing the primary molding from moving due to the injection of molten resin when performing secondary insert molding on the primary molding, and preventing misalignment. Therefore, it is possible to manufacture terminal blocks with high dimensional accuracy.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a first hoop material in one embodiment of the present invention.

FIG. 2 is an explanatory diagram of a terminal caulking process in an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a primary forming process in an embodiment of the present invention.

FIG. 4 is an explanatory diagram of a primary molded product obtained by primary molding in an embodiment of the present invention.

FIG. 5 is an explanatory diagram of a state in which a primary molded product is inserted into a mold in a secondary molding process according to an embodiment of the present invention.

FIG. 6 is an explanatory diagram of a state in which the mold is clamped in the secondary molding process of an embodiment of the present invention.

FIG. 7 is an explanatory diagram showing an enlarged main part of FIG. 6;

FIG. 8 is an explanatory diagram of the state shown in FIG. 6 viewed from above.

FIG. 9 is an explanatory diagram showing a state in which the insert is in contact with the primary molded product.

FIG. 10 is an enlarged view of the main part of FIG. 8;

FIG. 11 is a sectional view taken along line AA in FIG. 10;

FIG. 12 is a sectional view taken along line BB in FIG. 10;

13 is a sectional view taken along line CC in FIG. 10. FIG.

FIG. 14 is an explanatory diagram showing a nest used in a mold in an embodiment of the present invention.

FIG. 15 is a sectional view taken along line DD in FIG. 14;

FIG. 16 is a perspective view showing the configuration of a switch manufactured according to an embodiment of the present invention.

FIG. 17 is an explanatory diagram of a conventional terminal block manufacturing method.

FIG. 18 is an explanatory diagram showing a state of manufacturing a terminal block by a conventional terminal block manufacturing method.

[Explanation of symbols]

3A Primary molded product 10 Switch 11 Fixed contact part 11b Terminal 12 Movable contact part 12a Movable contact piece 14 Terminal 15 Primary molding block 16 Secondary molded block 19A upper mold 19b Recessed part 20A lower mold 20b Recessed part 23 Uneven part

Claims (1)

[Claims] [Claim 1] A primary molded product with terminals protruding from the primary molded block is created by primary molding, and a secondary molded product is formed from this primary molded product on the parting surface of an upper mold and a lower mold. In a method for manufacturing a terminal block, the terminal block is clamped using a mold provided with a cavity, and a secondary molding is integrally formed on the primary molded body by injection molding to create a terminal block in which the terminal is disposed protrudingly. An uneven portion is provided on the contact surface with the primary molded body of at least one of the above or the lower mold, and the uneven portion is bitten into the primary molded body when the mold is clamped, and the primary molded body is fixed. A method for manufacturing a terminal block, characterized by performing secondary injection molding.