JPH03268909A - Mold for molding of terminal - Google Patents

Abstract

PURPOSE:To enable molding of a terminal which is free from a defect such as an inferior external appearance and looks well, by a method wherein at least a part of a bottom force is constituted of a movable auxiliary mold and an elastic body is interposed between the auxiliary mold and bottom force. CONSTITUTION:A mold is constituted of a top force 8 and bottom force 9, the whole of a mold surface forming part of the bottom force is constituted of a movable auxiliary mold 91 and an elastic body 1 is interposed between the auxiliary mold 91 and bottom force 9. A molding main body is prepared beforehand by extrusion molding and the tip part 71 of the molding main body is set up within a cavity 912. The cavity 912 forms a spatial part B having a form identical with that of a molded body of a terminal which is going to be injection-molded. Then resin in a softened state is injected into a spatial part B. When the top force 8 is crowned over the tip part 71 of the molding main body within the auxiliary mold 91, the top force 8 presses the auxiliary mold 91, through which the elastic body 1 is compressed in accordance with dispersion of thickness. Therefore, a gap is eliminated from a space between the auxiliary mold 91 and the top force 8. Therefore, the molded body of the terminal, which is free from a defect such as an inferior external appearance and looks well, can be injection-molded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an end molding die for forming an end molded body at the tip portion of a relatively slender molded product such as a side molding.

[Prior Art] Side moldings are manufactured by a method disclosed in, for example, Japanese Patent Publication No. 61-39172.

That is, the side molding is generally made by joining the end molded body 6 by injection molding as shown in FIG. Manufactured by molding.

That is, the molding body 7 is first set with its tip portion 71 in a cavity 81.91 formed by the upper mold 8 and lower mold 9 of the end molding die.

Next, a thermoplastic resin such as polypropylene resin or polyvinyl chloride resin is placed in the sprue 82.91 in the cavity 81.91. It is injected through the gate 83.

Then, a terminal molded body 6, also called an end cap, is bonded and molded to the tip end portion 71 of the molding main body 7, and the side molding is completed.

[Issue to be solved] However, the above-mentioned conventional technology has a first-order problem.

That is, since the tip end portion 71 of the molding body 7 tends to have variations in thickness during extrusion molding, when injection molding the end molded body 6 onto the tip portion 71 of the molding body 7, it is necessary to A step or a gap may occur between the mold 9 (FIG. 8).

As a result, defects such as poor appearance occur in the terminal molded body 6 provided at the tip portion of the molding body 7. Further, when gas is injected, inconveniences such as gas leakage occur.

The present invention has been made in view of such conventional problems, and aims to provide a terminal molding die that can injection mold a terminal molded body with good appearance without defects such as poor appearance. .

[Means for solving problems]

The present invention provides a terminal molding die for molding a terminal molded body at the tip portion of a molded body main body, the terminal molding die comprising an upper mold and a lower mold, and at least one of the lower molds. The part consists of an auxiliary type that can move forward and backward.

The terminal molding die is characterized in that an elastic body is interposed between the auxiliary mold and the lower mold.

The most noteworthy feature of the present invention is that a part or the whole of the lower mold is constituted by an auxiliary mold that can move forward and backward, and an elastic body is interposed between the auxiliary mold and the lower mold. Examples include an auxiliary mold and a male mold having a cavity for setting the tip of the molded body.

Further, the auxiliary mold that can move forward and backward is provided on a part or all of the lower mold, as shown in FIGS. 1 and 5.

Examples of the elastic body include silicone rubber and urethane rubber. The elastic body is a cylinder, a polygon,
It has various shapes such as a rectangular parallelepiped.

A plate or support stand for clearance adjustment may be placed below the elastic body (see the first and third embodiments).

[For production]

When using the terminal molding die according to the present invention, first, a molded body is prepared. This molded body is manufactured by, for example, extrusion molding.

Next, the tip portion of the molded body body is set in the cavity of the end molding die. At this time, the cavity in front of the tip end portion of the molded body body forms a space having the same shape as the end molded body to be molded.

Therefore, a softened resin is injected into the space at the tip of the molded body. As a result, a molded body is obtained in which the end molded body is bonded and molded to the tip portion of the molded body main body.

By the way, if there are variations in wall thickness at the tip of the molded body, as shown in the prior art, a gap is created between the upper mold and the lower mold in the space for forming the terminal molded body. will occur.

However, in the present invention, part or all of the lower mold is constituted by an auxiliary mold that can move forward and backward, and an elastic body is interposed between the auxiliary mold and the lower mold. Therefore.

Even if there are variations in wall thickness at the tip of the molded body, the elastic body contracts in accordance with these thicknesses and pushes the auxiliary mold downward.

This eliminates the gap that conventionally occurred between the upper mold and the lower mold.

〔effect〕

Therefore, according to one aspect of the present invention, it is possible to provide a terminal molding die that is free from defects such as poor appearance and can mold a terminal molded body with good appearance.

〔Example〕

First Embodiment A terminal molding die according to this embodiment will be explained with reference to FIGS. 1 to 3.

That is, the end molding molds of the two examples are for injection molding the end molded body 6 (see FIG. 8) onto the tip portion 71 of the molding body as the molded body. The terminal molding die is as shown in FIG.

It consists of an upper mold 8 and a lower mold 9. The entire mold surface forming portion of the lower mold is composed of an auxiliary mold 91 that can move forward and backward, and an elastic body 1 is interposed between the auxiliary mold 91 and the lower mold 9.

The auxiliary mold 91 is placed in an auxiliary mold fitting hole 910 formed between the upper mold 8 and the lower mold 9. The auxiliary mold 91 has a concave cavity 912. Moreover, the cavity 91
2 is a space A for setting the molding main body tip 71, and a terminal molded body (path shown) in the tip of the space A.
It has a space B for joining and molding. Further, the cavity 912 has upwardly protruding convex portions 911, 911 on three sides, as shown in FIGS. 2 and 3.

What is most noteworthy here is that an elastic body 1 made of urethane rubber is interposed between the auxiliary mold 91 and the lower mold 9.

The elastic body 1 is fitted into the elastic body fitting hole 2 formed between the auxiliary mold 91 and the lower mold 9. Also.

As shown in FIG. 1, the elastic body 1 is arranged so that its upper end surface 11 is in contact with the auxiliary mold 91 and its lower end surface 12 is in contact with the lower mold 9.

Further, a plate 3 for adjusting clearance is arranged between the auxiliary mold 91 and the lower mold 9. The plate 3 is placed in a recessed groove 90 formed above the lower mold 9 so as to regulate the gap between the auxiliary mold 91 and the upper mold 8 to below a certain level.

Further, the upper mold 8 is arranged to correspond to the auxiliary mold 91 and the lower mold 9. That is, as shown in FIG. 1, the upper mold 8 has a cavity 81 against which the upper end surface 711 of the molding main body tip portion 71 comes into contact.

Further, a recess is formed at the tip of the cavity 81 so that a space B for forming an unmolded body is formed. Incidentally, the upper mold 8 is provided with a sprue and a gate (as shown in the figure), similarly to the conventional end molding mold.

Next, each action and effect will be explained.

That is, when using the terminal molding die according to this example, first, a molding body is prepared. This mall body is
Manufactured in advance by extrusion molding.

Next, the tip portion 71 of the molding body is inserted into the cavity 912.
Set inside. At this time, the cavity 912 forms a space B having the same shape as the end molded body to be injection molded. Therefore, a softened resin is injected into the space B. In the case of injection molding a hollow end molded body, pressurized fluid is first injected into the resin.

Thereby, a side molding is obtained in which the end molded body is bonded and molded to the tip portion of the molding main body.

By the way, 5. If there is a variation in wall thickness in the tip portion 71 of the mold body, a gap will be created between the upper die 8 and the auxiliary die 91 around the space B for forming the end molded body. It turns out.

However, in the two examples, the lower mold 9 is entirely composed of an auxiliary mold 91 that can move forward and backward, and the elastic body 1 is interposed between the auxiliary mold 91 and the lower mold 9.

Therefore, when the upper mold 8 is placed on top of the molding main body tip portion 71 in the auxiliary mold 91, the upper mold 8 pushes the auxiliary mold 91,
As a result, the elastic body 1 is compressed in accordance with the above-mentioned variation in wall thickness. Therefore, the auxiliary mold 92 is pushed down in the direction of the lower mold 9. Thereby, there is no gap between the auxiliary mold 91 and the upper mold 8.

Therefore, in this example of the terminal molding die.

It is possible to injection mold a terminal molded body that has no defects such as poor appearance and has a good appearance.

Further, in one example, a plate 3 for adjusting clearance is arranged between the auxiliary mold 91 and the lower mold 9.

Therefore, by replacing the plates 3 with different thicknesses, the gap between the auxiliary mold 91 and the upper mold 8 can be freely adjusted.

Second Example The terminal molding die according to this example will be explained using FIG. 4.

In the end molding die of this example, the plate for clearance adjustment in the first embodiment is not used, and the other configurations are the same as those in the first embodiment.

That is, between the auxiliary mold 91 and the lower mold, only an elastic body 1 is disposed in the elastic body fitting hole 2 and a clearance t is provided, and no plate for adjusting the clearance is used.

In this example as well, the same effects as in the first example can be obtained.

Third Embodiment A terminal molding die according to this example will be explained with reference to FIGS. 5 to 7.

That is, as shown in FIGS. 5 and 6, the terminal molding die of this example is one in which a part of the lower mold 9 is constructed with an auxiliary mold 96 instead of the auxiliary mold 91 in the first embodiment. It is. The other configurations are the same as those of the first embodiment.

As shown in FIG. 7, the auxiliary mold 96 has a curved molding body contacting surface 961 on the upper side and an elastic body fitting hole 962 on the lower side. And, in the elastic body fitting hole 962,
An elastic body 16 made of silicone rubber is inserted.

Further, as shown in FIGS. 5 and 6, the lower mold 9 has a concave cavity 910. Moreover, the cavity 910
has a space A in which the molding main body tip portion 71 is set, and a space B in which the end molded body is injection molded. Also, in a part of the space A.

A concave notch 93 is formed into which the auxiliary mold 96 is fitted. The auxiliary mold 96 is provided in the concave cutout 93.
to be placed.

Further, below the auxiliary mold 96, as shown in FIG.
Convex clearance adjustment support stand 9 via elastic body 16
Place 7. In addition, support stand 97 for rearance adjustment
A lower die base 98 is arranged below. An elastic body 16 is disposed between the auxiliary mold 96 and the support base 97 for adjusting clearance to form a clearance t. At this time, the auxiliary mold 96 is formed as shown in FIG.

It forms part of the cavity 910.

Then, as shown in FIG. 5, the molding main body tip portion 71 is set in the space A of the cavity 910. At this time, if there is variation in the thickness of the molding main body tip portion 71, a gap tends to exist between the auxiliary mold 96 and the upper mold 8. However, in one example, when the upper die 8 is covered, the elastic body 16 is compressed, and the gap is eliminated.

Therefore, even if there are variations in wall thickness in part 1 of the molding main body tip portion 71, such as the decorative uneven portion 712, no gap will be created between the upper mold and the lower mold due to these variations.

Therefore, according to this example, effects similar to those of the first example can be obtained.

[Brief explanation of drawings]

1 to 3 show the terminal molding die according to the first embodiment, FIG. Figure 3 is a perspective view of the auxiliary type, Figure 4 is the second type.
Cross-sectional view of the terminal molding die according to the example 1 Figures 5 to 7
The figures show a terminal molding die according to the third embodiment, FIG. 5 is a sectional view thereof, FIG. 6 is a perspective view of the lower die, FIG. FIG. 9 shows a conventional example. FIG. 8 is a sectional view of the side molding being molded in the end molding die, and FIG. 9 is a perspective view of the tip of the molding body. 1.16...Elastic body 2...Elastic body fitting hole 5 3...Plate for adjusting clearance. 31... Support stand for clearance adjustment. 7... Side molding 71... Tip part of side molding. 8... Upper mold 9... Lower mold. 91.96...Auxiliary type. t... Clearance 5 Fig. 2 A Fig. 3 11 Fig. 5 9/ 6th Fig. 7 Fig. 9

Claims (1)

[Scope of Claims] A terminal molding die for molding a terminal molded body at the tip portion of a molded body main body, the terminal molding die consisting of an upper mold and a lower mold, the lower mold having an upper mold and a lower mold. A mold for forming an end, characterized in that at least a part of the mold is composed of an auxiliary mold that can move forward and backward, and an elastic body is interposed between the auxiliary mold and the lower mold.