KR101325651B1 - Connecting atructure of giard core and core pin for injection mould - Google Patents

Abstract

The present invention includes molten upper and lower cores, upper and lower disks combined with the upper and lower cores, upper and lower fixing plates for supporting the upper and lower disks, respectively, a stripper plate which supports the lower core and is located between the upper and lower disks, a guide pin which protrudes toward the the upper disk from the bottom of the lower disk, and a guide bush into which the guide pin is inserted.

Description

CONNECTING ATRUCTURE OF GIARD CORE AND CORE PIN FOR INJECTION MOULD}

The present invention relates to a guide core and coa pin coupling structure of an injection mold, and more particularly, by providing guide cores and upper and lower core pins that are sequentially closed after guide pins during mold closing, thereby minimizing upper and lower eccentricity due to processing tolerances. It relates to a guide core and coa pin bonding structure of the injection mold that can be.

In general, an injection mold for a mold frame is divided into an upper mold (hereinafter, referred to as an upper mold) and a lower mold (hereinafter, referred to as a lower mold), and a molding groove into which a melt flows is formed in a mutual contact surface between the upper mold and the lower mold. The upper surface of the upper mold is formed with an inlet hole for inducing a melt into the upper mold groove. In addition, when contacting the upper mold and the lower mold, the guide pin protruding in a direction perpendicular to the lower mold is fixed to the contact surface of the upper mold, and the guide hole into which the guide pin is fitted is formed on the contact surface of the upper mold. do. The guide pin is a shaft having a circular cross section, and the guide hole is a circular hole in contact with the entire outer surface of the guide pin. Therefore, when the upper mold is closed (or mated) with the lower mold, the guide pin is inserted into the guide hole, thereby enabling accurate mold closing, and the upper and lower mold grooves are exactly matched. At this time, the outer surface of the guide pin is in contact with the entire inner surface of the guide hole. As such, when the molten material heated by the synthetic resin is injected through the inlet hole while the upper mold and the lower mold are closed, a molding is made while filling the molding groove. When the upper mold and the lower mold are opened (or separated from each other) in the molded state, the molded article can be obtained. The upper mold and the lower mold can be naturally closed and opened by being mounted on an injection molding machine. At this time, the guide pin guides the direction of the upper mold or lower mold to the position at which the molding process of the material is made, and serves to guide the exact mold closing position of the upper mold and the lower mold. As described above, in the case of the guide pin supported by the prior art, the guide pin is changed or replaced according to the width of the molded product according to the size or material of the molded product to be molded.

However, in the case of the work requiring precision such as mold base processing of injection mold, the processing structure of the guide pin of the injection pin is large, and the machining tolerance is large when the mold is closed. there was.

The present invention is to solve the problems as described above, by providing a guide core and a core pin to be sequentially closed after the guide pin when mold closing, it is possible to minimize the upper and lower eccentricity due to the processing tolerance, add a plurality of lower mold The same quality (concentricity, roundness) can be maintained, and defects due to the aging of the mold can be maintained by replacing the guide core to extend the life of the mold, especially when the product is very small. An object of the present invention is to provide a guide core and coa pin coupling structure of an injection mold capable of minimizing lower eccentricity.

In order to achieve the above object, the present invention is the upper and lower cores and the upper and lower cores are respectively formed by the sprue (Sprue) and runner (Runner) through which the molten resin flows, and the upper and lower discs, respectively, and the upper and lower An upper and a fixed plate supporting the disc, a stripper plate positioned between the upper plate and the lower plate while supporting the hacoa, a guide pin protruding toward the upper plate from the bottom of the lower plate, and the upper house upon mold closing. In the injection molding apparatus comprising a guide bush which the guide pin is fitted to the contact surface of the plate and the stripper plate,

An upper pin guide installed vertically on the upper core and having a pinhole formed therein, the upper end of which is in contact with the lower end of the upper plate, and the lower end of which is in contact with the upper end of the hacoa;

An upper core pin inserted in the upper pin guide of the upper pin guide and having a lower end protruding downward and a lower wedge protruding downward;

The upper pin guide is located on the lower extension line of the lower core, the upper end is directed toward the upper core and spaced apart from the lower end of the upper pin guide, and the lower end penetrates through the stripper plate to contact the upper end of the lower plate and a shaft hole is formed therein. Lower pin guide; And

The lower pin guide is inserted into the shaft hole from the bottom and the upper end is formed with a wedge insertion portion is inserted into the wedge portion of the upper core pin when mold closing, the lower end is characterized in that it comprises a lower core pin in contact with the lower plate.

A guide core positioned in the upper core, the upper surface of which is in contact with the upper plate, and the lower portion of which is protruded toward the lower core and is narrowly inclined toward the lower portion; And

Located on the downward extension line of the guide core is characterized in that it further comprises a guide core insertion hole for sliding the lower end of the guide core when the mold closing.

The guide core and the guide core insertion hole are characterized in that the cross section is rectangular.

As such, the present invention can minimize upper and lower eccentricity due to processing tolerances by providing guide cores and upper and lower core pins that are sequentially molded after the guide pin when mold closing, and even if a plurality of lower molds are added, the same quality (concentricity) , Roundness) can be maintained, and defects caused by the aging of the mold can be maintained by replacing the guide core, which can extend the life of the mold, and minimize the upper and lower eccentricity even when the product is very small. It has an effect.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

1 is a front cross-sectional view showing the appearance of the guide core and the core pin coupling structure during mold closing of the embodiment of the present invention,
Figure 2 is a plan view and a front view showing a state of the guide core in the injection mold of the present invention,
Figure 3 is an isolated side cross-sectional view showing a fastening pattern of the upper and lower core pins and upper and lower pin guides in the injection mold of the present invention,
Figure 4 is an enlarged cross-sectional view showing the main core and the lower core pin is separated when the mold opening of the guide core and the core pin coupling structure of the injection mold according to an embodiment of the present invention,
Figure 5 is an enlarged cross-sectional view showing the main portion and the lower core pin is combined when the mold closing of the guide core and the core pin coupling structure of the injection mold of the present invention,
Figure 6 is a main cross-sectional view showing the separation of the guide core and the upper and lower core coffin starting the mold of the injection core and the core pin coupling structure of the embodiment of the present invention,
Figure 7 is a main cross-sectional view showing the coupling between the guide core and the upper and lower core pins when closing the guide core and coa pin coupling structure of the injection mold according to an embodiment of the present invention,
Figure 8 is a plan view showing the appearance of the top core when the mold opening of the guide core and coa pin coupling structure of the injection mold according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the user, the intention or custom of the operator, and the like.

Therefore, it goes without saying that the definition should be based on the contents throughout this specification.

The guide core and the coffin pin structure of the injection mold of the present invention, the upper and lower cores 60, the product is formed by the sprue (not shown) and the runner (not shown) through which the molten resin flows. 61, upper and lower discs 70 and 71 coupled to the upper and lower cores 60 and 61, upper and lower fixed plates 90 and 91 supporting the upper and lower discs 70 and 71, and the hacoa A stripper plate 72 positioned between the upper plate 70 and the lower plate 71 while supporting the lower portion 61, and a guide pin protruding toward the upper plate 70 from the bottom surface of the lower plate 71. (80) and the injection molding apparatus comprising a guide bush (81, 82) to be fitted to the guide pin (80) to the contact surface of the upper plate (70) and the stripper plate (72) during mold closing, the upper core It is installed vertically to 60, the pinhole 11 is formed therein, the upper end is in contact with the lower surface of the upper plate 90, the lower end is in contact with the upper surface of the Hacoa (61) The upper core pin 20 is inserted into the guide hole 10 and the pinhole 11 of the upper pin guide 10, the lower end portion protrudes downward, and the lower core portion has a wedge portion 21 protruding downward. The upper pin guide 10 is located on the lower extension line Hacoa 61, the upper end is spaced apart from the lower surface of the upper pin guide 10 toward the upper core 60 side and the lower end of the stripper plate 72 A lower pin guide 30 through which the upper plate 71 is in contact with an upper end of the lower plate guide 31 and a shaft hole 31 formed therein; and a lower end of the lower pin guide 30. When the wedge insertion portion 41 is formed is inserted into the wedge portion 21 of the upper core pin 20, the lower end includes a lower core pin 40 in contact with the lower plate (71).

The guide core 50 is positioned in the upper core 60 and the upper surface is in contact with the upper plate 70 and the lower end protrudes toward the lower core 61 and is narrowly inclined toward the lower portion, and the guide core ( The guide core insertion hole 51 is positioned on the downward extension line of 50) and the lower end of the guide core 50 is slidably inserted when the mold is closed.

The guide core 50 and the guide core insertion hole 51 may have a rectangular cross section, but may be formed in a circular, hexagonal or octagonal shape.

In the present invention as described above, the tip end of the guide pin 80 when the mold closing is inserted through the guide bushing 81 of the stripper plate 72, the sliding insert into the guide bushing 82 of the upper plate 70. At this time, the mating of the upper plate 70, the stripper plate 72 and the lower plate 71 is made intact.

At the same time, the guide core 50 of the upper core 60 is slid to the inside of the guide core insertion hole 51 of the lower core, so that the shape of the upper plate 70 and the stripper plate 72 is changed. More complete.

At the same time, the lower wedge portion 21 of the upper core pin 20 slidingly inserted into the pinhole 11 of the upper pin guide 10 of the upper core 60 is the lower pin guide of the lower core 60 ( The upper core 60 and the hacoa 61, which are inserted into the wedge inserting portion 41 which is the upper recess of the lower core pin 40 slidingly inserted into the shaft hole 31 of the injection molding, are formed. more? By keeping it intact, the processing tolerance of the injection mold is minimized during injection molding, thereby minimizing the eccentricity toward the upper and lower sides during processing, thereby minimizing defective products.

In addition, the upper and lower core pins 20, which are sensitive to shocks due to the order of closing molds of the injection mold being sequentially made of guide pins 80, guide cores 50, and upper and lower core pins 20 and 40 (20 and 40). 40 can be prevented from being damaged, and even if a plurality of lower molds are added, the same quality (concentricity, roundness) can be maintained continuously.

In addition, the defect caused by the aging of the injection mold can maintain the quality of the injection mold only by the core of the guide core 50, and thus there is an effect that can extend the life of the mold at a low cost.

10: upper pin guide 11: pin hole
20: upper core pin 21: wedge
30: lower pin guide 31: shaft hole
40: lower core pin 41: wedge insertion portion
50: guide core 51: guide core insertion groove
60: sangcoa 61: hakoa
70: Senate 71: House of Representatives
72: stripper plate
80: guide pin 81,82: guide bush
90: fixing plate 91: fixing plate

Claims (3)

The upper and lower cores in which the product is formed by a sprue and a runner through which the molten resin flows, the upper and lower discs respectively coupled to the upper and lower cores, and the upper and lower fixing plates supporting the upper and lower discs, respectively, The guide pin on the contact surface of the stripper plate and the stripper plate positioned between the upper plate and the lower plate, the guide pin protruding toward the upper plate from the bottom of the lower plate and mold closing, In the injection molding apparatus comprising a guide bush to be fitted,
An upper pin guide installed vertically on the upper core and having a pinhole formed therein, the upper end of which is in contact with the lower end of the upper plate, and the lower end of which is in contact with the upper end of the hacoa;
An upper core pin inserted in the upper pin guide of the upper pin guide and having a lower end protruding downward and a lower wedge protruding downward;
The upper pin guide is located on the lower extension line of the lower core, the upper end is directed toward the upper core and spaced apart from the lower end of the upper pin guide, and the lower end penetrates through the stripper plate to contact the upper end of the lower plate and a shaft hole is formed therein. Lower pin guide; And
A guide core and an core of an injection mold including a lower core pin inserted into the shaft hole of the lower pin guide and inserted into the lower part of the lower pin guide, and the upper core pin is inserted into the wedge of the upper core pin. Pin coupling structure. The method of claim 1,
A guide core positioned in the upper core, the upper surface of which is in contact with the upper plate, and the lower portion of which is protruded toward the lower core and is narrowly inclined toward the lower portion; And
The guide core and the core pin coupling structure of the injection mold is located on the downward extension line of the guide core and further comprises a guide core insertion hole for sliding the lower end of the guide core when the mold closing. 3. The method of claim 2,
The guide core and the guide core insertion hole has a guide core and core pin coupling structure of the injection mold, characterized in that the cross section is rectangular.

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