JPS5832178Y2 - Mold - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a mold for molding and covering a bushing, a grommet, etc. on the outer circumferential surface of a conducting wire.

Conventionally, in this type of compression molding mold, both upper and lower molds were used as a method to prevent the uncoated parts of the conductor, such as the inner bushing and grommet, from being crushed between the upper and lower mold surfaces during molding. A commonly used method is to provide grooves each having a half-moon cross section at corresponding positions on the surface, and to hold the conducting wire in the grooves.

However, when using the above method, it is extremely difficult to stabilize the conductor within the groove because the depth of the groove is only one-half of the total outer diameter of the conductor. This causes it to protrude onto the dividing surface of both the upper and lower molds.

Such a phenomenon is particularly noticeable when, for example, molding is performed with the conducting wire bent at a right angle or the like.

In this way, the portions of the conductive wires that protrude from the upper and lower parts of the splitter may be crushed, or other coverings may be damaged, resulting in other inconveniences.

As a means to solve such conventional inconveniences, for example, there is a method of pulling both ends of the conducting wire through a piano wire, etc., or a method of having a depth of approximately the same outer diameter as the conducting wire only on the lower mold side of both upper and lower molds. Method of providing grooves (Utility Model Publication No. 46-19819)
, etc. have been disclosed, but in the former method, the work is extremely inefficient, and in the latter method, although it is possible to prevent the conductor from protruding onto the dividing surface, it is difficult to do so. The depth of the conductor and the outer diameter of the conductor do not always match,
For this reason, gaps tend to form within the grooves, and a portion of the molded material such as rubber may infiltrate into these gaps, preventing the molding material from adhering to the circuit. Since the conductor cannot be fixed in a fixed position, there is a risk that the bushing or the like may be covered eccentrically with respect to the conductor and become entangled.

The present invention is an attempt to improve the situation in view of the above-mentioned circumstances.In the lower mold surface of a pair of upper and lower molds, a groove is provided in which the entire outer diameter of the conducting wire can be adjusted by oneself, while a groove is provided in the upper mold surface. A protruding strip is provided in correspondence with the groove, and the protruding strip is provided so that it can be fitted into the groove, and the conducting wire is fitted into the groove in a suppressed manner through the protruding strip. By configuring this structure, it is possible to prevent the conductor from protruding onto the dividing surface during the molding process, and to reliably prevent the conductor from being crushed by both the upper and lower mold surfaces, or damage to its covering. , and is characterized by being able to prevent the molding material from penetrating into the conductive wire portion, thereby preventing burrs from adhering to the same portion.

Hereinafter, specific embodiments of the present invention will be described with reference to the illustrative drawings.

Reference numeral 1 indicates a molding die according to the present invention, 2 indicates an upper die, and 3 indicates a lower die.

Both upper and lower molds 2 and 3 are provided with a 4 protruding from the upper mold 2 side.
Book guide posts) 4, 4, 4, 4, and guide holes 5 opened on the lower mold 3 side in correspondence with the same posts 4...
5.5 and 5, so that they can be slid vertically and overlapped.

6 and 6' are recesses for covering molding carved approximately in the center of both the upper and lower molds 2°3 in correspondence with the upper and lower parts, and 7 and 8 are recesses d for covering molding carved on the lower mold 3 side. Recesses 9 and 10 are recesses I, which are deeper than the recess C for coating molding, at both ends of the recess.

The block pieces 9 and 10 are removably fitted into the lower die 3, and the block pieces 9 and 10 protrude upward from the dividing surface 3' of the lower mold 3, and the top surfaces of the block pieces 9 and 10 are A groove 11.1 is formed between the end of the covering mold forming recess 6' and the edge of the lower mold 3.
2, the grooves 11 and 12 are on the dividing surface 3' of the lower die 3.
The conductor wires are provided so as to be slightly deeper (about one-half of the total thickness of the conductor wires inserted into the grooves 11 and 12) than the depth X.

Reference numerals 13 and 14 are concave notches carved in the upper die 2 at positions corresponding to the concave portions 7 and 8, respectively, and the double concave top portion 13
．． The depth of 14 is made to be the same as the height of the block piece 9.10 protruding from its dividing surface.

Reference numerals 15 and 16 refer to protrusions that are removably protruded from the bottom surfaces of the recessed notches 13 and 14 through grooves 13' and 14' carved in the circular parts, and the protrusions 15 and 16 are If the grooves 11 and 12 are provided in correspondence with each other so that they can be inserted into the groove 1112, the height of both X and X will be slightly lower than the dividing direction 2' of the upper mold 2. The conductive wire is provided so as to be parallel to the total thickness of the conductive wire, and to have a thickness of approximately one-half of the total thickness of the conductive wire.

FIG. 5 shows another embodiment in which the block pieces 9 and 10 are made of a material with relatively low thermal conductivity, such as rubber, so that the conductor can be covered with vinyl or the like. Even when a heat-sensitive material is used, it is possible to mold a bushing, a grommet, etc. onto the outer peripheral surface of the material.

In FIG. 5, a core bar for preventing deformation and reinforcing the block piece 9 is built-in.

Further, in order to firmly hold the block piece 9, the lower mold is provided with concave and convex portions at corresponding locations on both parts, and these are fitted together.

In the above embodiment, both ends of the conductive wire are bent at right angles to form the conductive wire, but the bending angle of the conductive wire is not limited to the above, and the conductive wire may be formed in a straight state. It has the same effect even if

Next, its effect will be explained.

Both the upper and lower molds 2 and 3 are disassembled and heated as shown in Figure 2, while a rubber material that has been stretched into a flat strip shape and formed into an appropriate length is wrapped around a part of the conductive wire. wear.

Then, when the part of the conductive wire wrapped with the rubber material is pressed against the covering mold forming concave part σ of the lower mold 3, both ends of the conductor are buried in the grooves 11 and 12 carved in the block pieces 9 and 10. Make it happen so that you can put it into it.

However, with the conducting wire set on the lower mold 3 in this way, if the upper mold 2 is pressed onto the lower mold 3 in a superposed manner, the rubber material will be removed from both the upper and lower covered mold recesses 6, 6', while the conductive wire is compressed into an appropriate shape through the convex strips 15, 16.
It will be pressed into the groove 11, 12 through.

The present invention has the above structure, and as described above, the block pieces 9 and 10 are provided on the lower mold 3 side and project upward from the dividing direction 3'. While providing grooves 11 and 12 that are slightly deeper than the dividing direction 3', the upper mold 2
Convex strips 15 and 16 are provided on the sides in correspondence with the grooves 11 and 12 so that their height is slightly lower than the dividing surface 2' of the mold 2, and both ends of the conductor are placed in the grooves 11 and 12. By inserting the conductor into the groove 11.12, the conductor X is forcibly pressed into the groove 11.12 via the protrusions 15 and 16.
In addition to being completely hidden within the ridge 15, the conductor is
, 16 into the groove 1L12, a part of the conductor, especially the coating molding recess 6° 6' and the block piece 9,
As a result, it is possible to completely prevent the protrusion at the joint part with 10, and as a result, it is possible to completely prevent the protrusion of the joint part with 10.
This has made it possible to completely eliminate the inconvenience of being caught between 3' and 3'.

In addition, in the present invention, by forcibly pressing the conductive wire through the protrusions 15 and 16 in the grooves 11 and 12 as described above, the recesses 6 and 6 for forming the covering mold are formed. It has become possible to almost completely prevent the rubber material from entering into the grooves 11 and 12 at the part ', and it has become possible to prevent the adhesive from adhering to the part.

Block piece 9.10 that constitutes the graben 11.12
By forming the conductor using a material with relatively low thermal conductivity such as rubber, the forming force of bushings, grommets, etc. in the outer circumferential direction of the conductor wire covered with relatively heat-resistant materials such as vinyl can be reduced. The practical effect in this respect is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the mold according to the present invention, FIG. 2 is an exploded view of the same, FIG. 3 is a plan view of the lower mold showing the conductor set state, and FIG.
The figure is a sectional view of the main part, and FIG. 5 is a sectional view showing another embodiment. 1...Mold, 2...Upper die, 3...Lower die, 2', 3
'...Divided surface, 4... Guide post, 5... Guide hole, 6, 6'... Recessed part for coating molding, 1, 8...
Recess, 9, 10... Block piece, 11.12... Groove, 13.14... Recessed part, 13', 14'... Concave groove, 15, 16... Convex strip.

Claims (2)

[Scope of utility model registration request] (1) The dividing surfaces of the upper mold and the lower mold are provided with recesses for covering molding such as bushings and grommets for conducting wires in correspondence with each other vertically, and the dividing surface of the lower mold is provided with at least one end of the recesses. In order to secure the block piece in place, the block piece is provided so that its top surface protrudes upward from the dividing surface of the lower mold, and a groove for inserting the uncoated portion of the conductive wire into the lower mold is formed in the block piece. While it is set so that it is slightly modulus X from the dividing plane,
The dividing surface of the upper mold is provided with a recessed part for inserting the block piece, and the recessed part is provided with a protrusion that can be inserted into and removed from the groove.
A mold whose top protrudes so that it is located slightly lower than the dividing surface of the same mold. (2) A mold according to the claims for utility model registration, characterized in that the block pieces are formed using a material with low thermal conductivity such as rubber.