JP2002018902A - Mold for injection molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold for injection molding capable of facilitating a changing work of a molding insert in a short time and to provide a mold for injection molding capable of preventing erroneous assembling of the insert and facilitating its management. SOLUTION: In the case of manufacturing a molding with a different rib of a connector housing, a mold part for molding a rib part of the housing is constituted of a molding insert 18 made of a simple member directly attachable to or detachable from a parting line PL of the mold 10 for injection molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold used for manufacturing a connector housing of an automobile component, for example, a connector, and more particularly, to a process for manufacturing a molded article of a connector housing having a different shape. The present invention relates to an injection molding die capable of achieving the following.

[0002]

2. Description of the Related Art A connector housing of a connector used as a wiring component for an automobile is manufactured by injection molding a molten resin such as plastic. FIG.
1 shows an example of an external configuration of a connector housing C. A plurality of ribs R are formed on the outer peripheral surface of the connector housing C. Since the connector housing C is designed according to the purpose of use and the conditions of use, the colors and shapes thereof are various. Therefore, the connector housing C is
Even in the case of belonging to the same product type due to its use function, there are several types in which only the formation positions of the ribs R... .

FIG. 4 is a schematic configuration diagram of an injection molding die and a molding nest for manufacturing a connector housing of a conventional connector. The injection mold 400 is a multi-cavity mold (two-cavity mold), and is configured so that the fixed mold 402 and the movable mold 404 can be opened at the parting line PL. Then, the molding insert 406 is placed in the mold 4 so as to face the parting line PL.
00 is attached from the back side. The molding insert 406 is composed of a plurality of members (a plurality of parts 408...) As shown in FIG. Molding nest 40
6 are engraved with rib-shaped grooves 410 of the connector housing and other external shapes.

FIG. 1 shows the interior of the mold from the parting line PL of the movable mold 404. In the interior of the mold, various members such as a slide core as well as a molding insert 406 are incorporated. . The injection molding die 400 is configured such that a connector housing is manufactured by injecting a molten resin into a space formed by such various members and a mold.

[0005] Conventionally, when manufacturing a molded product having a different rib, the rearrangement work has been performed in the following procedure. First, the mold is opened and divided into a fixed mold 402 and a movable mold 404.
After removing the back plate 412 on the back side of the movable mold, an operation of removing a plurality of (eight) parts 408... One by one along the direction of arrow D (hereinafter, referred to as "mold release") is performed. . And then, eight parts 408 ...
After replacing the parts that need to be replaced,
Again, eight parts 408 are attached one by one from the back side of the mold along the direction of arrow C so as to face the parting line PL. Finally, the back plate 412 is attached,
02 and the movable mold 404 are clamped. This completes the rearrangement work. It is desirable that this rearrangement work be performed efficiently without taking as much time as possible.

[0006]

However, the conventional rearrangement work according to the above-described procedure has a problem that it takes a long time, specifically, about 90 minutes to 3 hours.
In the first place, it was necessary to separate the mold in the conventional procedure because, as shown in FIG. 4, the mounting structure of the eight parts was moved from the back side of the mold to the parting line PL in the direction of arrow C as shown in FIG. This is because the structure required the insert mold to be separated so as to face each other.

In addition, the conventional work of assembling eight parts involves:
The number of each part constituting the molding nest 406 (specifically, the part numbers 310, 390, 335, 32 in FIG. 5)
0, 326, 306, 323, 335). Therefore, the parts that do not need to be re-assembled, even though they are used as they are in the molding process of the connector housing with a different rib,
Must be reinstalled. At this time, if the number of each part is mistaken due to carelessness of the worker, it causes erroneous re-assembly, and the product yield is reduced. In addition, since the management of each part is performed not for each external shape of the connector housing but for each part number, there is a problem that management of each part is difficult.

[0008] Furthermore, in the rearrangement work, it is necessary to make the mutual clearance relationship between the eight parts proper, but it is not possible to maintain the proper clearance relationship due to the skill of the workers and individual differences. There were things. In this case, there is a problem that burrs and galling occur in the molded product after the injection molding.

[0009] Incidentally, as a well-known technique for producing a deformed molded product, for example, Japanese Patent Application Laid-Open No. H10-85896,
A technology has been disclosed in which, even for a product having portions having different molding / pulling directions, the fixed nest and the slide core are detachably exchangeable so that they can be manufactured using a common mold. However, in order to exchange the fixed nest and the slide core, the injection mold disclosed in the publication is opened, the fixed nest and the slide core are extracted according to the shape of the molded product, and then separated. It is necessary to attach a fixed nest and a slide core having a shape to perform mold clamping. Therefore, even in the case of manufacturing a molded article having the same shape and the same shape, it is necessary to replace both the fixed nest and the slide core depending on the shape.
There is a problem that it takes time. Therefore, the above-mentioned problems of the related art have not been solved at all.

[0010] An object of the present invention is to provide an injection molding die capable of easily and quickly changing a molding nest when manufacturing a connector housing. Still another object of the present invention is to provide an injection mold capable of preventing misalignment of the molding nest and facilitating its management.

[0011]

According to the present invention, there is provided an injection molding die according to the present invention, comprising:
A plurality of molds that are used to manufacture several types of connector housings belonging to the same product type and having different outer shapes, and that form a cavity for forming the outer shape of one connector housing. The gist is that, among the parts, a mold part for forming an outer shape in which the outer shape of the one connector housing is different from the outer shape of the other connector housing is configured by a molding nest made of a single member. Is what you do.

In this case, the mold portion for molding the rib of the connector housing may be constituted by a molding nest made of the single member.
Further, in the case of the first or second aspect, as in the third aspect, the molding nest may be configured to be detachable from a parting line.

[0013] According to the injection molding die of the present invention having the above-described configuration, the outer shape of the one connector housing is different from that of the plurality of die portions forming the cavity for forming the outer shape of the one connector housing. A mold part for molding an outer shape that is different from the outer shape of the connector housing of
For example, a mold portion for forming a rib is formed by a molding nest made of a single member that can be detached from a parting line of the injection molding mold. Therefore, the work of changing the molding nest can be performed by a simple operation of opening the fixed mold and the movable mold, removing the molding nest, attaching another molding nest, and retightening the mold. It is. That is, so-called mold separation becomes unnecessary.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1A (a) shows a schematic configuration of an injection molding die according to an embodiment of the present invention, and FIG. 1 (b) shows a schematic configuration of a molding nest as a part thereof. It is a thing. FIG. 1B is an enlarged view of the external configuration of a molding nest that is attached to the parting line PL as a part of the injection molding die 10.

In these figures, an injection molding die 10 is shown.
Is composed of a fixed mold 12 and a movable mold 14 movable with respect to the fixed mold 12, and has a structure capable of opening the fixed mold 12 and the movable mold 14 at a parting line PL.

Reference numeral 16 denotes a molding cavity. Since a part of the molding cavity 16 is formed inside a molding insert 18 to be described later, its details are omitted in FIG. Incidentally, the entire shape of the internal space of the molding cavity 16 itself is not only the shape engraved in the molding nest 18, but also the mold inside the fixed mold 12 and the movable mold 14,
It is determined comprehensively by a slide core not shown.
Molten resin filled from a filling port (not shown) via a sprue or a runner is filled into the molding cavity 16, thereby completing the outer shape of the connector housing C. Molding cavity 16 on parting line PL
The number of the injection molding dies 10 is two.

The molding nest 18 includes a molding cavity 16.
Are formed from a single metal member in the mold portion for molding the rib R of the connector housing C and other contour shapes. FIG. 1B shows an enlarged view thereof. The reason why the rib R and other parts for forming the contour shape in the molding cavity 16 are formed by the molding nest 18 which is a single member is that several types of connector housings C to be manufactured differ from each other only in the rib shape. Because.

The corresponding portion of the molding insert 18 is provided with an air vent groove in addition to a rib forming groove 20 for molding a rib portion. Further, the molding insert 18 has a slight tapered shape extending toward the PL surface in order to make it easy to detach from the parting line PL.

The molding insert 18 is attached to the main body of the movable mold 14 by a mounting member 22... From the parting line PL of the movable mold 14 in the direction of arrow A as a part of the injection mold 10. Installed. Therefore,
The injection molding die 10 has a structure in which the molding insert 18 can be replaced with another molding insert from the parting line PL surface. Incidentally, as the attachment members 22, for example, screws are cited.

Therefore, in order to manufacture a molded article having a different rib, various nests for forming various rib shapes are prepared in advance as the nests 18 for forming. For this reason, the injection molding die 10 has a structure that can be adapted to various rib shapes of several types of connector housings belonging to the same product type to be manufactured and having different external shapes. It can be said.

For example, FIGS. 2A to 2C show a front view of a set of nine molding nests 18 used to manufacture a molded article with different ribs of the connector housing C together with the outer shape of the connector housing. is there. In these figures, a solid line indicates a front view of the molding insert 18, and a broken line indicates an outer shape of the connector housing to be manufactured.

In the injection molding process using the nine types of molding nests shown in these figures, different colored resins are used to facilitate identification of molded products having different ribs. The management of the nine types of molding inserts 18 can also be performed based on the color of the molded product.

The rearrangement of the molding inserts 18 when manufacturing a molded product with different ribs of the connector housing C is performed as follows (see FIG. 1A). First, the injection molding die 10 is opened, and the molding nest 18 is removed from the parting line PL of the movable die 14 along the B direction. Next, a molding insert corresponding to the rib shape of the connector housing C manufactured in the next process is attached along the direction A from the parting line PL. Then, the fixed mold 12 and the movable mold 14 are clamped, and the combination of the molding inserts 18 is completed. Therefore, unlike the related art, since it is not necessary to separate the mold, the nesting can be easily changed, and the time required for the operation is at least about one third of the related art. In other words, the required time is about 20 to 30 minutes.

With reference to FIGS. 2A to 2C, a description will be given of a case where each connector housing (molded product with a different rib) is manufactured using nine types of molding nests. If necessary as a preparatory stage, the mold is separated once and various nests and molds are attached. Thereafter, in order to manufacture the first rib difference molded product, a molding insert corresponding to the first rib shape is attached from the parting line surface of the movable mold with a screw or the like, and the mold is clamped. Then, a predetermined number of black connector housings are injection molded.

When the above process is completed, the mold is opened and the first nest is removed by loosening a screw or the like from the parting line surface of the movable mold in order to manufacture a second rib difference molded article. Then, the second nest is attached from the parting line surface with a screw or the like, and after clamping, a predetermined number of natural color connector housings are injection molded. The time required to convert the first molding nest to the second molding nest is about 20-30 minutes.

The third through ninth rib difference molded products are manufactured based on a predetermined manufacturing plan in the same manner as described above.
There are a total of nine types of molding nests, but it is not necessary to use all of them, and which molding nest to use and in what order can be appropriately selected and changed according to the production situation. I just need. In addition, since the above-mentioned reassembling operation is completed in a simple process of opening the mold of the injection molding die → attaching / detaching the mounting member → clamping, the molded product obtained through the injection molding process includes an individual worker. Clearance inconsistencies and molding defects (burrs and galling) caused by the difference are eliminated.

According to the above-described embodiment, the time required for the nesting rearrangement work is about one third as compared with the related art, and the work is also facilitated. In addition, when the molding nests are composed of a plurality of types as described above, the molded products having different ribs to be injection-molded have different colors, so that each molded product and each nest can be managed by the type of color. Can be. Therefore, the management of the molded product and the molding nest can be performed more easily than in the conventional case where only the part numbers are used as a guide.

In the above embodiment, as shown on the right side of FIGS. 2A to 2C, each molded product and each molding part can be numbered. It does not hinder anything. The above-described embodiment is particularly useful in that the work process is shortened and that mis-rearrangement and mis-management can be easily found.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the example of the two-piece injection mold is shown. However, the number of injection molds to which the present invention is applied is four, eight, etc. It is not limited at all.

[0030]

According to the injection molding die according to the first to third aspects of the present invention, one of the plurality of die parts constituting the cavity for molding the outer shape of one connector housing is provided. Since the outer shape of the connector housing is formed by a molding nest made of a single member, the mold portion for forming the outer shape having a different relationship from the outer shape of the other connector housings is required. It can be easily performed in a short time. Further, according to the present invention, since the molding insert is constituted by a single member, erroneous rearrangement of the molding insert can be prevented, and the yield of the injection molded article can be improved.

According to the second or third aspect of the present invention, the mold portion for molding the rib of the one connector housing is constituted by the molding nest made of the single member. Therefore, there is an effect that it is possible to increase the efficiency of manufacturing the molded article having a different rib. Further, there is an effect that the management of the rib forming nest becomes easy.

According to the third aspect of the present invention, since the molding nest is detachable from the parting line, it is necessary to separate the mold when changing the molding nest. Absent. Therefore, there is an effect that the work of replacing the molding nest can be easily and accurately performed in a short time. In addition, individual differences among workers can be eliminated.

[Brief description of the drawings]

FIG. 1A is a schematic configuration diagram of an injection mold according to an embodiment of the present invention, and FIG. 1B is a schematic configuration diagram of a molding nest.

FIG. 1B is a schematic configuration diagram showing an enlarged external configuration of a molding nest that is attached to a parting line as a part of the injection molding die shown in FIG. 1A.

FIG. 2A is a front view of various molding nests used to produce a different rib molded article.

FIG. 2B is a continuation of FIG. 2A, also showing a front view of various molding nests used for manufacturing a different rib molded article.

FIG. 2C is a continuation of FIG. 2B, also showing a front view of various molding nests used to produce a different rib molded article.

FIG. 3 is an external perspective view of a connector housing shown as an example of an injection molded product.

FIG. 4 (a) is a schematic configuration diagram of a conventional injection molding die, and FIG. 4 (b) is a schematic configuration diagram of a molding nest.

FIG. 5 is a schematic front view showing an example of a front form of a conventional molding nest together with parts other than the parts constituting the molding nest.

[Explanation of symbols]

10: mold for injection molding, 12: fixed mold, 14: movable mold,
16 molding cavity, 18 molding nest, 20 rib forming groove, 22 mounting member, PL parting line

Claims (3)

[Claims] 1. A cavity for molding an outer shape of one connector housing in an injection molding die used for manufacturing several types of connector housings belonging to the same type and having different outer shapes. Among the plurality of mold parts, the mold part for molding the outer shape in which the outer shape of the one connector housing is different from the outer shape of the other connector housing is formed by a molding nest made of a single member. A mold for injection molding characterized by being made. 2. The injection mold according to claim 1, wherein a mold portion for molding the rib of the one connector housing is constituted by a molding insert made of the single member. 3. The injection mold according to claim 1, wherein the molding insert is detachable from a parting line.