Insert grommet formation mold and grommet manufacturing method using same

Abstract

The present invention relates to an insert grommet formation mold and a grommet manufacturing method using same, the mold having a separable structure including a left mold forming a left wing, a central mold having one side protruding to form a relief space, and a right mold forming a right wing, thereby enabling the manufacture of a grommet with improved shrinkage characteristics and airtightness.

Description

Mold for forming insert grommets and method for manufacturing grommets using the same

[0001] The present invention relates to a mold for molding an insert grommet and a method for manufacturing a grommet using the same, wherein the mold is composed of a separable structure comprising a left mold forming a left wing, a central mold with one side protruding to form a weight reduction space, and a right mold forming a right wing, thereby enabling the production of a grommet with increased shrinkage and airtightness.

[0002] Generally, automobiles are equipped with many electrical components, including headlights, brake lights, and interior lights, and such components are powered by a battery.

[0003] In addition, electricity supplied from the battery is distributed to electrical components installed inside the dust cover, and multiple connectors corresponding to each electrical component are provided inside the dust cover, and wiring is connected to the connectors of the dust cover, and waterproof grommets are used to prevent moisture, such as rainwater, from penetrating from the outside and causing a short circuit when the wiring is mounted on the dust cover.

[0004] In addition, the above-mentioned grommet is manufactured by an injection molding device, and the injection molding device supplies molten material to the cavity to form it, then moves the upper or lower mold to open the cavity and ejects the molded product.

[0005] In addition, there are various types of such injection molding devices, and among them, a molding device is being developed that first supplies multiple strands of cable to pass through a cavity and then injects molten material into the cavity to form a grommet together with the cable.

[0006] In relation to such technology, the technology of a molding device is disclosed in Korean Patent No. 1239183 by the applicant of the present invention, and its configuration is as shown in FIG. 1, wherein the mold includes an upper hub (11b), an upper core block (12), an upper side molding member (13), and an upper back molding member (14).

[0007] And, the upper hub (11b) has an upper core groove (11b-1) formed on the bottom surface of the upper plate (11), and the upper core block (12) is firmly fixed to the upper plate (11) together with the upper side molding member (13) and the upper back molding member (14).

[0008] Additionally, the upper side molding member (13) is formed in the shape of a thin plate, and the upper back molding member (14) is fixed to the upper plate (11) by bolts while forming a third molding part for the upper back molding of the grommet (G), and the side can be fixed to the side of the upper side molding member (13).

[0009] In addition, the grommet (50) produced by the above mold has a mounting groove (55) formed on its outer circumference for mounting a dust cover as shown in FIG. 2, and a space (S) for compression when the dust cover enters is formed in the body (B).

[0010] However, the above-mentioned mold has the disadvantage that it is difficult to form a slimming structure with a configuration including an upper core block (12), an upper side molding member (13), and an upper back molding member (14).

[0011] In addition, the upper core block (12), upper side molding member (13), and upper back molding member (14) have a fixed configuration, which has the disadvantage that various structures cannot be applied.

[0012] The objective of the present invention, which aims to improve upon the aforementioned conventional problems, is to provide a mold for molding an insert grommet and a method for manufacturing a grommet using the same, which enables production with a simple configuration, allows for the combination of molds having various functions, facilitates the production of a grommet through a reduction space, and enables the application of various manufacturing processes using a single set of molds.

[0013] To achieve the above objective, the present invention comprises a set of corresponding upper and lower molds for molding a grommet in which a weight-loss space, which is deformable to be compressed toward the center when the grommet is compressed, is installed inclined toward the center.

[0014] The above upper and lower molds are composed of a separable structure comprising a left mold forming a left wing, a central mold with one side protruding to form a weight-removal space, and a right mold forming a right wing.

[0015] The above-described left mold and right mold provide a mold for forming a grommet in which a hole forming portion for forming a wire hole of the grommet is integrally formed protrudingly on at least one side.

[0016] In addition, the present invention provides a grommet molding die in which the left die and the right die each further comprise a positioning block having a support groove on one side to support an insert wire.

[0017] In addition, the central mold or the left and right molds of the present invention provide a grommet molding mold in which a recessed groove portion is integrally formed along at least one of the perimeters.

[0018]

[0019] Meanwhile, the present invention provides a method for manufacturing a grommet using an insert grommet molding die configured such that a wire is connected to the inner side of a grommet body manufactured by applying a grommet molding die.

[0020] In addition, the present invention provides a method for manufacturing a grommet using an insert grommet molding die in which a grommet body is integrally formed on the outer side of the wire by double injection.

[0021] In addition, the present invention provides a method for manufacturing a grommet using an insert grommet molding die, wherein a fixing block is integrally molded on the outer side of the wire of the present invention, and a grommet body is integrally molded on the outer side of the fixing block by double injection.

[0022] In addition, the present invention provides a method for manufacturing a grommet using a mold for forming an insert grommet in which a wire is inserted into the inner side of the grommet body after the wire hole is formed and a watertight connection is formed.

[0023] As described above, according to the present invention, it is possible to manufacture and install with a simple configuration, combine molds having various functions, facilitate the production of grommets through the weight-removal space, and have the effect of applying various manufacturing processes by utilizing a single set of molds.

[0024] FIGS. 1 and 2 are schematic diagrams illustrating a conventional mold and a side view illustrating a grommet produced by the mold.

[0025] FIG. 3 is an external view of a mold according to the present invention.

[0026] FIGS. 4 and FIGS. 5 are a perspective view and a plan view, respectively, illustrating a mold according to the present invention.

[0027] FIGS. 6 and FIGS. 7 are a plan view illustrating a mold according to another embodiment of the present invention and a diagram showing the combined state of a grommet and a wire, respectively.

[0028] FIG. 8 is a diagram showing the combined state of a grommet and a wire according to another embodiment of the present invention.

[0029] The present invention provides a mold for forming a grommet in which a compression space capable of deformation upon compression through a reduction space of the grommet is installed at an angle toward the center of the grommet, and an insert mold for forming a wire integrally with the grommet during forming, and a method for manufacturing a grommet using the same.

[0030] Hereinafter, embodiments of the present invention will be described in detail based on the attached drawings.

[0031] As illustrated in FIGS. 3 to 8, the mold (100) of the present invention is composed of a set of upper and lower molds assembled facing each other to form a grommet in which a weight-reducing space (150), which can be deformed into a state of being compressed toward the center when the grommet is compressed, is installed at an angle toward the center.

[0032] And, the upper and lower molds (200) are formed in a separable structure of a left mold (310) that forms the left body (313) and left wing (311) of the grommet (300), a central mold (350) that has a protrusion (351) on at least one side to form a slimming space (150) between the left body and the right body, and a right mold (370) that forms the right body (371) and right wing (373), and are installed to be assembled together.

[0033] Additionally, the left mold (310) or the right mold (370) may have a hole forming part (360) formed on at least one side for forming a wire hole (170) of a grommet to mount a wire (160).

[0034] Additionally, the above-mentioned left mold (310) and right mold (370) may further be provided with a positioning block (390) having a support groove (391) on one side to support an insert wire.

[0035] Additionally, the central mold or the left and right molds may have a recessed groove (380) formed along at least one of their circumferences.

[0036]

[0037] Meanwhile, the wire (160) of the present invention is inserted into a wire hole (170) that is pre-formed in the grommet body (330) and then sealed with watertightness.

[0038] At this time, adhesive may be applied to the wire (160) inserted into the wire hole (170) and then inserted and cured, or adhesive may be applied to the wire hole (170) after inserting the wire (160) and then cured to make it watertight.

[0039] Additionally, the above-mentioned left mold (310) and right mold (370) are further provided with a positioning block (390) having a support groove (391) on one side to support an insert wire, and the wire (160) is placed on the support groove (391) to determine its position in space, and then a material is formed on the outside by double injection to form a grommet body (330), thereby forming the wire and the grommet body as a single unit.

[0040] Additionally, the above-mentioned left mold (310) and right mold (370) are further provided with a positioning block (390) having a support groove (391) on one side to support an insert wire, and after the wire (160) is placed on the support groove (391) to determine its position in space, the material is formed on the outside by double injection to form a grommet body (330), thereby forming the wire and the grommet body as a single unit.

[0041] At this time, as shown in FIG. 8, a fixed block (750) in which the wire is integrally formed by the deposit type (700) is first formed, and the wire (160) that is integrally formed on the fixed block (750) is placed in the support groove (391) to determine its position in space, and then a material is formed on the outer side by double injection to form a grommet body (330), thereby forming the wire and the grommet body (330) as a single unit.

[0042] In addition, an uneven surface (751) is integrally formed around the perimeter of the fixed block (750) to increase the contact area during molding and improve bonding.

[0043]

[0044] The operation of the present invention, configured as described above, is explained.

[0045] As illustrated in FIGS. 3 to 8, the mold (100) of the present invention is composed of a set of upper and lower molds assembled in a state facing each other, and by supplying molten raw material to the upper and lower molds under a certain temperature condition, it is possible to produce a grommet (300).

[0046] And, the upper and lower molds (200) are formed with a separable structure of a left mold (310) that forms the left body (313) and left wing (311) of the grommet (300), a central mold (350) that has a protrusion (351) on at least one side to form a weight loss space (150), and a right mold (370) that forms the right body (371) and right wing (373), thereby enabling the formation of various weight loss spaces.

[0047] In addition, if the left mold (310) or the right mold (370) has a hole forming part (360) formed protruding on at least one side for forming a wire hole (170) of a grommet, a wire (160) can be installed separately in a subsequent process.

[0048] At this time, the hole forming part (360) is made of a slide core so that when the grommet is ejected, the hole forming part is detached first and then the grommet is ejected.

[0049] Additionally, when a grommet is manufactured using a mold having a hole-forming part (360) as described above, a wire (160) may be assembled into the wire hole (170) of the grommet (300) according to the working conditions and then sealed.

[0050] In addition, the left mold (310) and the right mold (370) are each further provided with a positioning block (390) having a support groove (391) to position and support an insert wire on one side, so that when the positioning block (390) is assembled on one side of the left mold (310) and the right mold (370), the wire is positioned and the wire is integrally formed on the outer side by double injection molding, thereby enabling the production of a grommet.

[0051] In addition, the central mold or the left and right molds have a recessed groove (380) formed along at least one of the perimeters, and when manufacturing the grommet (300), at least one protruding ridge (180) is provided on one side of the outer perimeter to increase the surface area for waterproofing and thus increase watertightness.

[0052]

[0053] Meanwhile, the present invention enables the production of a grommet in which the wire is integrally joined by inserting a wire (160) into a wire hole (170) that is pre-formed in a grommet body (330) and then sealing it tightly.

[0054] At this time, the wire (160) inserted into the wire hole (170) may be sealed in a watertight state inside the wire hole by applying adhesive to the wire and then inserting and curing it, or the wire (160) may be sealed by filling the space of the wire hole (170) with adhesive (not shown) or filler (urethane or silicone) after inserting the wire (160).

[0055] In addition, the above-mentioned left mold (310) and right mold (370) are further provided with a positioning block (390) having a support groove (391) on one side to support an insert wire, and after the wire (160) is placed on the support groove (391) to determine its position in space, a material is formed on the outside by double injection molding to form a grommet body (330) in which the wire is integrally provided.

[0056] Additionally, a fixed block (750) in which the wire is integrally formed may be formed first using a pre-prepared deposit mold (700), and the wire (160) that is integrally formed on the fixed block (750) may be placed in a support groove (391) to determine its position in space, and then the material may be formed on the outer side by double injection to form a grommet body (330), thereby forming the wire and the grommet body (330) integrally.

[0057] In addition, an uneven surface (751) is integrally formed around the perimeter of the fixed block (750) to increase the contact area during the molding of the grommet body.

[0058] In addition, the above-mentioned fixed block is made of the same material as plastic or wire sheathing to prevent deformation even when pressure is applied, making molding easy, and the left wing (311) and right wing (373) formed on the outer side by double injection are made of a soft material such as rubber, so that when assembled into the mounting hole (not shown) of the dust cover (not shown) which is the mounting part, the adhesion is further enhanced to ensure watertightness and airtightness.

[0059] The present invention provides a mold for molding a grommet that enhances shrinkage and airtightness during the production of a grommet by the mold, and a method for manufacturing a grommet using the same. The mold for molding a grommet is composed of a separable structure comprising a left mold forming a left wing, a central mold with one side protruding to form a reduction space, and a right mold forming a right wing.

Claims

1. A set of corresponding upper and lower molds is used to form a grommet in which a reduction space, capable of deforming into a state of compression toward the center upon compression of the grommet, is installed at an angle toward the center. The above upper and lower molds are, a) Left mold forming the left wing and b) A central mold with one side protruding to form a weight loss space and c) A mold for forming a grommet, comprising a separable structure of a right mold forming a right wing.

2. A mold for forming a grommet according to claim 1, wherein the left mold and the right mold are characterized by having a hole-forming portion protruding from at least one side for forming a wire hole of the grommet.

3. A grommet forming mold according to claim 1, wherein the left mold and the right mold are further provided with a positioning block having a support groove on one side to support a wire.

4. A method for manufacturing a grommet using an insert grommet molding die, wherein a wire is integrally connected to the inner side of a grommet body manufactured by applying a grommet molding die comprising any one of claims 1 to 3.

5. A method for manufacturing a grommet using an insert grommet molding die, wherein, in paragraph 4, the wire is characterized in that a grommet body is integrally molded on the outer side by double injection.

6. In paragraph 4, the above wire has a fixing block further integrally molded on the outer side, and A method for manufacturing a grommet using an insert grommet molding die, characterized in that a grommet body is integrally molded by double injection on the outer side of the above-mentioned fixed block.

7. A method for manufacturing a grommet using an insert grommet molding die, wherein, in paragraph 4, the grommet body is characterized by having a wire inserted into the inner side after a wire hole is formed and then sealed.

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