KR102355368B1 - Mold to inject so that the irregularities are formed on the inner surface - Google Patents

Abstract

The present invention relates to a mold for injecting an injection product having an outer surface and a hollow inner surface formed inside the outer surface, the hollow inner surface having irregularities, wherein the mold corresponds to the outer surface to form the outer surface A mold body 400 manufactured to have an outer boundary surface; and a hollow part 410 is formed in the center of the mold body 400 and
The hollow part 410 is provided with a slide core (310, 320) manufactured to have an inner boundary surface corresponding to the inner surface to form the inner surface of the injection-molded product, and is formed by the outer boundary surface and the inner boundary surface. Provided is a mold for injection such that an uneven portion is formed on the inner surface, characterized in that the molding is made by injecting a material into the space.

Description

Mold to inject so that the irregularities are formed on the inner surface }

The present invention relates to an injection mold that can easily take out a product having irregularities in an inner hollow part, and more particularly, by dividing a center block and a locking block to operate independently, the undercut molded product can be easily taken out It relates to an injection mold that can be

In general, undercut refers to a concave part in which it is difficult to eject a molded product only by movement in the mold closing or mold opening direction of the injection mold. Such undercut can be divided into a case where it is outside and a case where it is inside the molded product, and it is not easy to take out the product due to the undercut part. Defects may have occurred in the product.

Therefore, conventionally, blower method or forced extraction method is used to easily take out molded products with such undercuts, but the blower method is difficult to manage product thickness tolerances this exists

1): Republic of Korea Registered Utility Model Publication No. 20-138133 2): Republic of Korea Patent Publication No. 10-0787196 3): Republic of Korea Patent Publication No. 10-0421608

The present invention is to solve the above problems, and by dividing the center block and the locking block to operate independently so that the product having irregularities inside and outside the hollow part can be taken out, the undercut molded product can be easily An object of the present invention is to provide a mold that can be taken out.

However, the object of the present invention is not limited to the above-mentioned object, and another object not mentioned will be clearly understood by those skilled in the art from the following description.

The present invention is to solve the above-described problems, in a mold for injecting an injection molded product 10 having an outer surface and a hollow inner surface formed inside the outer surface, and the hollow inner surface is provided with irregularities, the A mold body 400 manufactured to have an outer boundary surface corresponding to the outer surface to form an outer surface; and a hollow part 410 is formed in the center of the mold body 400 and the hollow part 410 A slide core (310, 320) manufactured to have an inner boundary surface corresponding to the inner surface to form the inner surface of the injection-molded product is provided, and the material is injected into the space formed by the outer boundary surface and the inner boundary surface to be molded There is provided a mold for injection so as to form an uneven portion on the inner surface, characterized in that this is made.

Preferably, the slide cores 310 and 320 have an inner boundary surface corresponding to the inner surface of the injection-molded product, divided into a plurality of pieces constituting the inner boundary and formed to slide independently of each other, so that after molding is completed, the slide core When taking out (310, 320), each slide core (310, 320) is slid inward so that the pieces are separated from the inner surface, and then taken out in the axial direction of the hollow part.

In addition, the plurality of slide cores 310 and 320 are formed in an even number, and when taking out the slide cores 310 and 320, first slide the odd-numbered or even-numbered slide cores 310 and 320 into the hollow part. Then, the hollow shaft is taken out in the axial direction, and then the even-numbered or odd-numbered slide cores 310 and 320 are slid to the inside of the hollow part and then taken out in the axial direction of the hollow shaft.

In addition, the plurality of slide cores (310, 320) are connected to the carving parts (311, 321) forming the inner boundary surface and the engraving parts (311, 321) and radially arranged wing parts (312, 322); is formed, When the plurality of slide cores 310 and 320 are placed in the correct position for molding, a space portion 330 in which the carving parts can slide is provided on the inside opposite to the inner boundary surface in the carving parts 311 and 321. do.

In addition, in order to prevent the engraving parts 311 and 321 from being pushed inward during molding, a center block 100 is provided in the space 330 , so that the center block 100 is placed in the space 330 . After molding in the fitted state, the center block 100 is removed to leave the space 330 empty, and the pieces 311 and 321 of the slide core slide into the space 330 .

In addition, locking blocks 210 and 220 for stopping the slide cores 310 and 320 are provided, and the wing portions 312 and 322 have an assembly portion 314 for assembling with the locking blocks 210 and 220 . ) is formed and assembled with the locking blocks 210 and 220, and then the slide cores 310 and 320 are locked in place.

In addition, the wing parts 312 and 322 of the odd-numbered or even-numbered slide core are installed above the mold body 400, and the wing parts 312, 322 of the even-numbered or odd-numbered slide core are the mold body. Installed under the 400, the blades 312 and 322 of the slide core are disposed above and below the mold body 400 so that the respective blades 312 and 322 do not overlap each other.

In addition, the locking blocks 210 and 220 are respectively disposed above and below the mold body 400 at the same position as the positions of the assembled wing parts 312 and 322, and inside the respective slide cores 310 and 320. Let the depth of the concavo-convex portion on the inner surface corresponding to the interface be L1, and when the sliding distance of the corresponding slide cores 310 and 320 is L2, L1 < L2, so that the slide cores 310 and 320 are moved in the axial direction of the hollow part. When taking out, the sliding distance is secured so that the inner boundary surface does not interfere with the inner surface.

In addition, in the method of injecting the injection-molded product 10 having an outer surface and a hollow inner surface formed inside the outer surface, and the hollow inner surface is provided with irregularities, the outer surface is placed on the outer surface to form the outer surface. A first step of preparing a mold body 400 manufactured to have a corresponding outer boundary surface; a second step of assembling the mold body 400; a third step of preparing the slide cores (310, 320) manufactured to have an inner boundary surface corresponding to the inner surface; a fourth step of inserting the slide core into the mold body 400 for assembly; a fifth step of injecting a material into a space formed by the outer boundary surface and the inner boundary surface to proceed with molding; It is characterized in that the injection method is made so that the uneven portion is formed on the inner surface.

In addition, in the first step, step 1-1 of preparing a hollow portion 410 to be formed in the center of the mold body 400 in the first step; and, in the third step, the slide core includes the plurality of slide cores. The engraving parts 311 and 321 forming the inner boundary surface and the wing parts 312 and 322 connected to the engraving parts 311 and 321 and arranged in the radial direction; Step 3-1 preparing to be formed; and the engraving parts 311 and 321 ) in the inner side opposite to the inner boundary surface, the third step of preparing to form a space 330 in which the sculpture parts can slide is added; is further added.

In addition, in the fourth step, a center block 100 is provided and the center block 100 is inserted into the space portion 330 in a 4-1 step; A locking block (210, 220) is provided to further add the 4-2 step of assembling the locking block (210, 220) to the wing part (312, 322),

In step 3-2, the plurality of slide cores 310 and 320 are prepared in an even number; step 3-3; and the wing portions 312 and 322 of the odd-numbered or even-numbered slide core are formed in the mold body ( Steps 3-4 are installed above the mold body 400; and Steps 3-5, the wing portions 312 and 322 of the even-numbered or odd-numbered slide cores are installed below the mold body 400; adds more

In addition, a sixth step of removing the center block 100 after the fifth step; a seventh step of removing the locking blocks (210, 220); an eighth step of sliding the sculpting parts 311 and 321 of the slide core into the space 330; a ninth step of taking out the slide cores (310, 320) from the space (330); Through a tenth step of separating the mold body 400, the injection-molded product is separated from the mold body 400 to be injected such that an uneven portion is formed on the inner surface of the injection-molded product.

As described above, according to the present invention, there is an effect that an undercut molded article having irregularities in the inner hollow part can be easily taken out by dividing the center block and the locking block to operate independently.

In addition, in the present invention, irregularities are provided on the inner surface of the hollow mold body 400, and the mold body 400 in which the irregularities are injected is separated, so that the injection product 10 with irregularities on the outer surface can be easily taken out. , it has the effect of improving work efficiency.

1 is a schematic diagram showing a clamping time of a mold for molding according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the molding die of FIG. 1 .
3 is a perspective view illustrating an operation operation of the molding die of FIG. 1 .
4 is a cross-sectional view of the mold at the time of clamping of the molding die of FIG.
5 is a process perspective view showing an extraction process after the injection process of the molding mold of FIG. 1 .

As for the terms used in the present invention, general terms that are currently widely used are selected, but in specific cases, there are also terms arbitrarily selected by the applicant. should be taken into account to understand its meaning.

Hereinafter, the technical configuration of the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings. Here, it should be noted that all expressions related to directions such as up, down, left and right, right, left, and bottom are described based on the presented drawings.

The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Throughout the specification, like reference numerals are assigned to similar parts.

Hereinafter, a preferred embodiment of an injection molding mold for molding an injection product in which an uneven portion is formed on an inner surface according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram showing the clamping time of a molding die according to the present invention, FIG. 2 is an exploded perspective view of the molding die of FIG. 1, and FIG. 3 is an operation operation of the molding die of FIG. It is a perspective view shown, and FIG. 4 shows the cross section of the mold at the time of clamping of the mold for shaping|molding of FIG.

1 to 4, a schematic diagram showing the clamping time of a mold in which an injection operation for molding an injection product having irregularities formed on the inner and outer surfaces using the molding mold according to an embodiment of the present invention is completed In order to form the outer surface, the mold body 400 is manufactured to have an outer boundary surface corresponding to the outer surface; and a hollow part 410 is formed in the center of the mold body 400 and the hollow part 410 ) has a slide core (310, 320) manufactured to have an inner boundary surface corresponding to the inner surface to form the inner surface of the injection-molded product 10; a space formed by the outer boundary surface and the inner boundary surface It shows a mold into which an injection product with irregularities formed on the inner and outer surfaces by injecting material into the mold can be injected.
That is, in detail, by using a mold for molding, the injection product 10 having an outer surface having irregularities and a hollow inner surface formed inside the outer surface having irregularities, but having irregularities on the inner and outer surfaces of the hollow is injected. Describe the mold.
The mold body 400 manufactured to have an outer boundary surface corresponding to the uneven outer surface to form an uneven outer surface in the injection product 10; and the mold bodies 400-1 and 400-2 are After molding is completed, the mold body 400-1, 400-2 has an outer boundary surface corresponding to the outer surface of the injection-molded product 10, and is divided into two pieces constituting the outer boundary surface and formed to slide independently of each other. ) can be taken out after sliding to both sides so that the injection product 10 having irregularities on the outer surface is separated from the inner surface of the mold.

Such a mold will be described in detail with reference to an exploded perspective view of the mold for molding in FIG. 2 .

As shown in FIG. 2, the injection mold has a shape in which the mold body 400 can be divided and combined, and slide cores 310 and 320 are provided at the center of the combined mold body 400; As the slide cores 310 and 320 are assembled, a core forming an internal space of the injection-molded product is formed.

A portion corresponding to the outer surface of the injection-molded product is provided with a mold body 400 manufactured to have an outer boundary surface corresponding to the outer surface, and when the separated mold is combined, a space portion is formed inside the mold.

In addition, slide cores 310 and 320 are assembled in the inner space 410 of the combined mold body 400, and the core of the mold is formed to form the hollow injection product 10. Melting in a space formed by the outer peripheral surface of the inner space 410 of the mold body 400 forming the outer peripheral surface of the injection product 10 and the outer peripheral surface of the core assembled with the hollow slide cores 310 and 320 A mold capable of forming the injection-molded product 10 having irregularities formed on the outer and inner circumferential surfaces by injection and molding is provided.

In addition, the configuration of the mold capable of forming the injection-molded product 10 having the concave-convex portions formed on the outer and inner peripheral surfaces as described above, that is, the mold body 400, the slide cores 310 and 320, and the slide cores 310 and 320. The moving locking blocks 210 and 220 and the center block 100 will be described in detail.

The mold body 400 is formed of divided molds 410 and 420 corresponding to one side of the molded article 10, and is shown in the drawing as a configuration divided into two, but it may be formed by dividing it into a plurality of pieces. .

In addition, the divided and movable mold 400 is operated by a hydraulic cylinder (not shown) as in a conventional two-stage mold, and detailed illustration and description thereof will be omitted.

In addition, the slide cores 310 and 320 are configured to be coupled to the core of the mold for forming the hollow injection product 10 , and an inner boundary surface corresponding to the inner surface of the injection product 10 . A slide formed in the lower part between the divided pieces of the slide core 310 formed in the upper part so as to form a single core shape by sliding the divided manipulations into a plurality of pieces constituting the inner boundary surface independently from the upper part and the lower part. By allowing the divided pieces of the core 320 to be assembled, after the molding is completed, the slide core assembled later among the slide cores 310 and 320 slides inward first so that the pieces are separated from the inner surface of the injection-molded product 10 . and then take it out in the axial direction (upper side and lower side) of the hollow part.

In addition, the plurality of slide cores 310 and 320 are formed in an even number, and when combined, first slide the odd-numbered or even-numbered slide cores 310 and 320 to the outside of the hollow part, and then the even-numbered or odd-numbered slide cores Assemble by sliding (310, 320) to be inserted between the first sliding piece.

Also, as shown in FIG. 4, the pieces 311 of the slide core 310 that are assembled later between the pieces of the slide core 320 assembled first slide between the first assembled operation parts 321 to form a single core. Therefore, the second sliding piece must be formed to be inserted between the first assembled manipulation units 321 to facilitate assembly.

That is, if you look at the cross section B-B' in FIG. 4, the slide core installed on the upper side of the mold body 400 is called the odd-numbered slide core 310, and the slide core installed on the lower side is called the even-numbered slide core 320. at the time,

When assembling, the odd-numbered slide core 310 is assembled later, and at the time of extraction, the engraving part 311 forming an inner boundary surface to be slidable so that it can be extracted first is a rectangular cross-section or a trapezoidal shape for easy assembly is formed with

In addition, the even-numbered slide core 320 is assembled at the beginning, and is extracted later when extracted, so that the cross section of the engraving part 321 constituting the inner boundary surface is formed in a 90-degree triangular shape,

When assembled in such a shape, it is formed in a rectangular cross section so that the engraving part 311 of the odd-numbered slide core 310 can be slidably assembled and extracted between the assembled engraving part 321 surface and the engraving part 321 surface. .

4 shows the shape of the assembled slide cores 310 and 320 and the state in which the engraving part 311 of the odd-numbered slide core 310 is slid when taken out. and a description thereof will be omitted.

In addition, when taking out the slide cores 310 and 320, first slide the odd-numbered or even-numbered slide cores 310 and 320 into the hollow part in the reverse order to the assembly order, and then take it out in the axial direction of the hollow shaft. , then slide the even-numbered or odd-numbered slide cores 310 and 320 to the inside of the hollow part, and then take it out in the axial direction of the hollow shaft.

In addition, the plurality of slide cores (310, 320) are connected to the carving parts (311, 321) forming the inner boundary surface and the engraving parts (311, 321) and radially arranged wing parts (312, 322); is formed, When the plurality of slide cores 310 and 320 are placed in the correct position for molding, a space portion 330 in which the carving parts can slide is provided on the inside opposite to the inner boundary surface in the carving parts 311 and 321. do.

In addition, in order to prevent the engraving parts 311 and 321 from being pushed inward by the injection pressure during molding, the slide cores 310 and 320 have a center block inserted into the space 330 to be assembled. (100); is provided and the center block 100 is molded in a state fitted in the space portion 330, and then the center block 100 is removed to leave the space portion 330 empty to form the slide core. The carving parts 311 and 321 are slid into the space part 330 .

In addition, locking blocks 210 and 220 for sliding or stopping the slide cores 310 and 320 are provided, and the wings 312 and 322 are assembled to be assembled with the locking blocks 210 and 220 After the part 314 is formed and assembled with the locking blocks 210 and 220 , the slide cores 310 and 320 are locked in place.

The movement of the locking blocks 210 and 220 is operated by a hydraulic cylinder (not shown), which is a conventional method, and detailed illustration and description thereof will be omitted.

In addition, the wing parts 312 and 322 of the odd-numbered or even-numbered slide core are installed above the mold body 400, and the wing parts 312, 322 of the even-numbered or odd-numbered slide core are the mold body. Installed under the 400, the blades 312 and 322 of the slide core are disposed above and below the mold body 400 so that the respective blades 312 and 322 do not overlap each other.

In addition, the locking blocks 210 and 220 are respectively disposed above and below the mold body 400 at the same position as the positions of the assembled wing parts 312 and 322, and inside the respective slide cores 310 and 320. Let the depth of the concavo-convex portion on the inner surface corresponding to the interface be L1, and when the sliding distance of the corresponding slide cores 310 and 320 is L2, L1 < L2, so that the slide cores 310 and 320 are moved in the axial direction of the hollow part. When taking out, the sliding distance is secured so that the inner boundary surface does not interfere with the inner surface.

The extraction process described above is shown in a perspective view for each extraction process in FIG. 5 , and referring to FIG. 5 , looking at the extraction process after the injection process of the molding mold according to the embodiment of the present invention, FIG. 5 (a) process is the mold In this combined state, the molten material is injected into the space formed inside the mold to mold, and after the molding process, the process of extracting the center block 100 as shown in FIG. 5(b), FIG. 5(c) ), remove the locking block 210 and slide the slide core 310 into the hollow as shown in FIG. 5(d), and then, as shown in FIG. 5(e), the slide core (310) can be extracted toward the top of the mold.

In addition, after the slide core 310 on the upper side of the mold 400 is extracted, when the mold is moved and spaced apart as shown in FIG. 5(f), the lower slide core 320 combined with the injection product formed inside the mold is After sliding the separated slide core 320 into the hollow part as shown in 5(g), the slide core 320 is removed from the slide core 320 as shown in FIG. 5(h). The extrudate can be ejected upwards.

In addition, looking at the injection method, in the method of injecting the injection-molded product 10 having an outer surface and a hollow inner surface formed inside the outer surface, and the hollow inner and outer surfaces are provided with irregularities, the injection-molded product 10 ) in order to form an outer surface of the first step of preparing a mold body 400 manufactured as a separate mold to have an outer boundary surface corresponding to the outer surface; a second step of assembling the mold body 400; a third step of preparing the slide cores (310, 320) manufactured to have an inner boundary surface corresponding to the inner surface; a fourth step of assembling the slide core into the mold body 400; a fifth step of injecting a material into a space formed by the outer boundary surface and the inner boundary surface to proceed with molding; It is made of a method of injection so as to form a concave-convex portion on the inner surface.

When describing these steps in detail, the first step 1-1 of preparing the mold body 400 manufactured as a separate mold in the first step to form a hollow part 410 in the center of the mold body 400; And, in the third step, the slide core includes: the plurality of slide cores are connected to the engraving parts 311 and 321 forming the inner boundary surface and the engraving parts 311 and 321 and radially arranged wings (312, 322); Step 3-1 to prepare to be formed; and Step 3-2 to prepare a space 330 in which the carving parts can slide on the inside opposite to the inner boundary surface in the carving parts 311 and 321 Add more steps;

In addition, in the fourth step, a center block 100 is provided and the center block 100 is inserted into the space portion 330 in a 4-1 step; A locking block (210, 220) is provided to further add the 4-2 step of assembling the locking block (210, 220) to the wing part (312, 322),

In step 3-2, the plurality of slide cores 310 and 320 are prepared in an even number; step 3-3; and the wing portions 312 and 322 of the odd-numbered or even-numbered slide core are formed in the mold body ( Steps 3-4 are installed above the mold body 400; and Steps 3-5, the wing portions 312 and 322 of the even-numbered or odd-numbered slide cores are installed below the mold body 400; adds more

In addition, a sixth step of removing the center block 100 after the fifth step; a seventh step of removing the locking blocks (210, 220); an eighth step of sliding the sculpting parts 311 and 321 of the slide core into the space 330; a ninth step of taking out the slide cores (310, 320) from the space (330); Through a tenth step of separating the mold body 400, the injection-molded product is separated from the mold body 400 to be injected such that irregularities are formed on the inner and outer surfaces of the injection-molded product.

The above description has been described as illustrative of the present invention, and the embodiments published in the specification are intended to explain, not to limit the technical idea of the present invention, so those of ordinary skill in the art to which the present invention pertains Various modifications and variations will be possible without departing from the technical idea of Therefore, the protection scope of the present invention is to be interpreted by the matters described in the claims, and technical matters within the scope equivalent thereto should be construed as being included in the scope of the present invention.

10: injection molding 100: center block
210, 220: locking block 310, 320: slide core
311, 321: carving part 312, 322: wing part
400: mold body 410: hollow part of the mold

Claims (8)

The mold body 400 manufactured to have an outer boundary surface corresponding to the outer surface having the unevenness in order to form an outer surface with irregularities; and
The mold bodies 400-1 and 400-2 have an outer boundary surface corresponding to the outer surface of the injection-molded product 10, and are divided into two pieces constituting the outer boundary surface to be formed to slide independently of each other, so that the molding is completed After that, the mold body 400-1, 400-2 slides to both sides so that the molded product 10 with irregularities on the outer surface is separated from the inner surface of the mold, and then the mold body 400 can be taken out. A hollow part 410 is formed in the center of
The hollow part 410 has a slide core (310, 320) manufactured to have an inner boundary surface corresponding to the inner surface to form the inner surface of the injection-molded product;
Molding is made by injecting a material into the space formed by the outer boundary surface and the inner boundary surface,
In addition, the slide cores 310 and 320 have an inner boundary surface corresponding to the inner surface of the injection-molded product 10, divided into a plurality of pieces constituting the inner boundary surface and formed to slide independently of each other, so that after molding is completed When taking out the slide cores 310 and 320, slide each of the slide cores 310 and 320 inward so that the pieces fall from the inner surface, and then take them out in the axial direction of the hollow part,
In addition, the plurality of slide cores 310 and 320 are formed in an even number, and when taking out the slide cores 310 and 320, first slide the odd-numbered or even-numbered slide cores 310 and 320 into the hollow part. and then take it out in the axial direction of the hollow part, and then slide the even-numbered or odd-numbered slide cores 310 and 320 into the hollow part and take it out in the axial direction of the hollow part,
In addition, the plurality of slide cores 310 and 320 are connected to the engraving parts 311 and 321 forming the inner boundary surface and the engraving parts 311 and 321 and radially arranged wing parts 312 and 322;
When the plurality of slide cores 310 and 320 are placed in the correct position for molding, a space portion 330 in which the carving parts can slide is provided on the inside opposite to the inner boundary surface in the carving parts 311 and 321. become,
In addition, in order to prevent the engraving parts 311 and 321 from being pushed inward during molding
A center block 100 is provided in the space 330, and the center block 100 is molded while being fitted in the space 330, and then the center block 100 is removed to form the space 330. Sliding the engraving parts 311 and 321 of the slide core into the space 330 with an empty state,
In addition, the locking blocks 210 and 220 are respectively disposed above and below the mold body 400 at the same position as the positions of the assembled wing parts 312 and 322, and inside the respective slide cores 310 and 320. Let the depth of the concavo-convex portion on the inner surface corresponding to the interface be L1, and when the sliding distance of the corresponding slide cores 310 and 320 is L2, L1 < L2, so that the slide cores 310 and 320 are moved in the axial direction of the hollow part. When taking out, the injection mold 10 having irregularities on the inner and outer surfaces of the hollow is injected using a mold that injects the inner and outer surfaces to form irregularities on the inner and outer surfaces that secure a sliding distance so that the inner boundary does not interfere with the inner surface. in a way,
A first step of preparing the mold body 400 separated in two, manufactured to have an outer boundary surface corresponding to the outer surface having the unevenness in order to form the outer surface having the unevenness;
a second step of assembling the mold body 400 separated into two;
a third step of preparing the slide cores (310, 320) manufactured to have an inner boundary surface corresponding to the inner surface;
a fourth step of inserting the slide core into the mold body 400 for assembly;
a fifth step of injecting a material into a space formed by the outer boundary surface and the inner boundary surface to proceed with molding; is made up of
in the first step
Step 1-1 of preparing a hollow part 410 to be formed in the center of the mold body 400; and
In the third step, in the slide core, the plurality of slide cores are connected to the engraving parts 311 and 321 forming the inner boundary surface and the engraving parts 311 and 321 and radially arranged wing parts 312 and 322; is formed. Step 3-1 to prepare; and
In the engraving parts 311 and 321, on the inside opposite to the inner boundary surface, the 3-2 step of preparing a space 330 in which the engraving parts can slide is formed; further adding,
a 4-1 step in which the center block 100 is provided and the center block 100 is inserted into the space portion 330;
The locking block (210, 220) is provided, and the 4-2 step of assembling the locking block (210, 220) to the wing part (312, 322); further adding,
In step 3-2, the plurality of slide cores 310 and 320 are prepared in an even number; step 3-3; and the wing portions 312 and 322 of the odd-numbered or even-numbered slide core are formed in the mold body ( Steps 3-4 are installed above the mold body 400; and Steps 3-5, the wing portions 312 and 322 of the even-numbered or odd-numbered slide cores are installed below the mold body 400; adds more,
In addition, a sixth step of removing the center block 100 after the fifth step; a seventh step of removing the locking blocks (210, 220); an eighth step of sliding the sculpting parts 311 and 321 of the slide core into the space 330; a ninth step of taking out the slide cores (310, 320) from the space (330); Through a tenth step of separating the mold body 400, the injection-molded product having irregularities formed on the inside and outside is separated from the mold body 400 and injected so as to form the uneven portions on the inner surface of the molded product. and a method of injecting such that an uneven portion is formed on the outer surface.
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