KR20150051702A

KR20150051702A - Double shot injection mold

Info

Publication number: KR20150051702A
Application number: KR1020130133528A
Authority: KR
Inventors: 이중재; 윤병주
Original assignee: 이중재
Priority date: 2013-11-05
Filing date: 2013-11-05
Publication date: 2015-05-13
Also published as: KR101553322B1

Abstract

Disclosed is a double-shot injection mold, wherein the mold has a rotary molding plate which transfers an intermediate injection-molded product at a first injection molding location to a second injection molding location and has been improved to stop at a precisely aligned location. The disclosed double-shot injection mold has multiple aligning pins protruding from one of the rotary molding plate and a lower circular plate to the other, and multiple pin holes formed on the other of the rotary molding plate and the lower circular plate to fit the multiple aligning pins, as a means for aligning the rotary molding plate to rotate at the precise angle toward a lower circular plate; and has multiple aligning protrusions projected from one of a upper mold and a lower mold to the other, and multiple receiving parts formed on the other of the upper mold and the lower mold to receive the multiple protrusions, as a means for aligning the upper mold to closely fit the lower mold precisely, wherein the rotary molding plate is configured to rotate, separated from the lower circular plate with the multiple aligning pins removed from the multiple aligning pin holes and to get close again to the lower circular plate to force the multiple aligning pins to insert into the multiple aligning pin holes.

Description

A double shot injection mold

The present invention relates to an injection molding die, and more particularly, to a dual injection molding die for injecting and curing at a primary injection position, moving to a secondary injection position, and injection and curing once more to form a product.

Injection molding is a method in which a molten resin is injected into a mold and cooled to form a product. Compared with other molding methods such as compression molding and extrusion molding, And the size is limited, and productivity and workability are excellent, and it is widely used for molding of plastic products.

The dual injection molding mold means a mold capable of injection molding a product in one cycle using a resin of different kind or different color. The double injection molding die requires a means for transferring intermediate intermediate articles formed by injection and curing at the primary injection position to the secondary injection position. The intermediate injection article is mounted at a predetermined angle (for example, 180 °) A rotating rotary mold plate can be employed. The rotary mold plate needs to be rotated by exactly 180 degrees but it is difficult to accurately align the stop positions after the rotation due to the thermal expansion and deformation of the related parts under the high temperature condition in the double injection mold and thus a double injection operation error occurs , Product defects may occur.

Korean Patent Registration No. 10-0846109

The present invention provides a dual injection molding die that is capable of stopping at a precisely aligned position of a rotating mold plate that rotates to move an intermediate transfer article molded at a primary injection position to a secondary injection position.

The present invention also provides a compactly constructed double injection molding die capable of molding an article having an undercut and formed of a resin of different or different color.

The present invention also provides a double injection molding die provided with an eject pin on the upper mold side for separating the final molded product from the mold.

The present invention relates to an injection molding machine comprising a primary upper core portion defining an upper side shape of an intermediate injection molded product formed by injecting a primary molten resin at a primary injection position, a secondary molten resin injected into the intermediate injection product at a secondary injection position An upper mold having an upper upper core portion for supporting the primary upper core portion and an upper upper plate for supporting the primary upper core portion and an upper mold for supporting the lower upper core portion, Wherein the lower core portion and the lower core portion are the same in number as the sum of the numbers of the primary upper core portion and the secondary upper core portion, And a lower mold having a rotary mold plate that rotates by a predetermined angle to move the product to the secondary injection position and a lower circular plate that rotatably supports the rotary mold plate A plurality of alignment pins protruding from one of the rotary mold plate and the lower circular plate toward the other one of the rotary mold plate aligning means for aligning the rotary mold plate so as to rotate at an accurate angle with respect to the lower original plate, And a plurality of alignment pins formed in the other one of the lower disk and the plurality of alignment pins so as to fit into the upper die, A plurality of alignment protrusions protruding from one of the upper mold and the lower mold toward the other one of the upper mold and the lower mold and a plurality of aligning protrusions And the rotary mold plate is spaced apart from the lower original plate, Rotation with the column away from the pin of the plurality of aligned pin holes state, closer to the back of the lower circular plate provides a dual injection mold adapted to re-fitted to the plurality of aligned pin holes of the plurality of alignment pins.

The first upper core portion and the second upper core portion may have a plurality of the same number.

The primary upper core portion may include a horizontal moving core piece that is horizontally movable so that an undercut is formed in the intermediate yarn product.

Wherein the plurality of horizontally moving core pieces are radially arranged with respect to the center of the primary injection position, and when the upper mold and the lower mold are in close contact with each other, The piece may be pitted toward the center of the primary injection position to define an upper side profile of the intermediate article.

The secondary upper core portion may include a horizontal moving core piece that is horizontally movable so that an undercut is formed in the final product.

The double injection mold of the present invention is characterized in that when the upper mold and the lower mold are separated from each other, the final article is attached to the second upper core, and the final article is separated from the second upper core An eject pin projecting downwardly may be provided on the upper mold.

Wherein the plurality of alignment pins are provided in one of the rotary mold plate and the lower circular plate so as to be arranged at the same distance and at equal angular intervals from the center of rotation of the rotary mold plate, And the other one of the rotary mold plate and the lower circular plate is disposed at the same distance and at the same angular interval from the rotation center of the rotary plate.

The aligning protrusion receiving portion includes a lower disc aligning groove formed on the lower disc and aligned with the aligning protrusion, and a lower disc aligning recess formed in the rotating mold plate, and only when the aligning pin is fitted in the aligning pin hole, And a rotary mold plate alignment groove aligned in a straight line with the lower disk alignment grooves.

The double injection molding die of the present invention includes an alignment pin and an alignment block so that the rotary die plate can rotate at a predetermined angle and stop at an accurate position. Therefore, a double injection operation error and a product failure are prevented.

The double injection molding die according to the embodiment of the present invention can be formed by double injection molding an article having an undercut. In addition, a plurality of horizontally moving core pieces for forming an undercut are provided on the upper mold, and a configuration for separating the final product from the mold is provided on the upper mold so that the double injection molding die is compactly formed, size is easy to design.

1 is a cross-sectional view illustrating an article molded using a dual injection molding die according to an embodiment of the present invention.
2 is a perspective view illustrating a double injection molding die according to an embodiment of the present invention.
3 is an exploded perspective view showing the lower mold of FIG.
FIG. 4 is an exploded perspective view showing a state in which the upper mold and the lower mold of FIG. 2 are aligned, and the lower side of the upper mold is seen to be seen.
FIGS. 5 and 6 are sectional views sequentially showing the opening and closing of a mold at a primary injection position when a double injection operation is performed using the double injection molding die of FIG. 2. FIG.
FIGS. 7 and 8 are sectional views sequentially showing the opening and closing of the mold at the secondary injection position when the double injection operation is performed using the double injection molding die of FIG. 2. FIG.

Hereinafter, a dual injection molding die according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The terminology used herein is a term used to properly express the preferred embodiment of the present invention, which may vary depending on the intention of the user or operator or the custom in the field to which the present invention belongs. Therefore, the definitions of these terms should be based on the contents throughout this specification.

FIG. 1 is a cross-sectional view of a product molded using a dual injection molding die according to an embodiment of the present invention. Referring to FIG. 1, the double injection molding die 10 (see FIG. 2) The final product (1) is a member in the form of a lampshade, in which the intermediate product (2) and the additional product (3) are integrally formed. The intermediate article (2) and the additional article (3) are made of a different kind of resin material or a different color resin material. As a specific example, the intermediate article 2 is an opaque colored resin and the additional article 3 is formed of a translucent colored resin.

A plurality of through holes 7 are formed in the intermediate transfer article 2 so as to horizontally penetrate the intermediate transfer article 2 over the entire area and the through holes 7 are horizontally moved in the first injection molding process. The undercuts require a core to be formed. The additional article 3 is injected and cemented on the outer surface of the intermediate article 2, closing the through-holes 7 in the secondary injection process.

Gate waste 4 is formed at the upper end of the intermediate product 2 due to the primary injection and runner waste 6 is formed at the lower end of the additional product 3 due to the secondary injection. . The gate waist 4 and the runner waist 6 are removed after the final product 1 is taken out of the double injection molding die 10 (see Fig. 2). In addition to the gate waist 4, a bolt fastening portion 5 is also formed at the lower end of the additional article 3. The bolt fastening portion 5 is pushed by the ejection pins 56 and 57 (see FIG. 8) to come into direct contact with the end of the ejection pin 57 when the final product 1 is taken out of the double injection molding die 10 It is pushed down.

FIG. 2 is a perspective view illustrating a dual injection molding die according to an embodiment of the present invention, FIG. 3 is an exploded perspective view illustrating the lower mold of FIG. 2, Fig. 6 is an exploded perspective view showing the lower mold side of the upper mold. Referring to FIGS. 2 to 4, the dual injection molding die 10 according to the embodiment of the present invention includes an upper mold 40 and a lower mold 11.

The lower mold 11 includes a rotary mold plate 20 rotated by 180 degrees around the rotation center line RL, a lower circular plate 12 rotatably supporting the rotary mold plate 20, And four lower cores 30 fixed on the upper side of the lower core 20. The four lower core portions 30 are arranged on the corner portions of the square or the rectangle centering on the rotation center line RL and are arranged on the protruding surface defining the lower side surface shape of the intermediate transfer article 2 32). At the top of the projecting surface 32 is formed a gate 34 for uniformly and rapidly injecting the primary molten resin into the primary injection cavity C1 (see FIG. 6).

The first upper core portion 60 is tightly fixed to the lower core portion 30 when the upper mold 40 comes close to the lower mold 11 and the injection impact of the molten resin A fixing hook 35 is fastened to the moving hook 76 of the first upper core portion 60 so as not to be separated. A moving hook guide groove (36) is formed around the fixed hook (35) so that the moving hook (76) slides horizontally. The fixing hook 35 and the moving hook guide groove 36 are arranged radially with respect to the center of the four lower core portion projecting faces 32, respectively. The moving hooks 76 are disposed only in a pair of the first upper core portions 60 and are arranged radially eight in relation to the center of the first upper core portion 60.

A rotary shaft 21 protrudes downward along the rotation center line RL on the lower side of the rotary mold plate 20 and a shaft connection hole 21 is formed in the center of the lower circular plate 12 so that the rotary shaft 21 passes therethrough. 15 are formed. Although not shown, the lower end of the rotating shaft 21 protruding downwardly through the lower disk 12 may be connected so as to receive the rotational power of the motor so as to be repeatedly rotated at intervals of 180 °.

The dual injection molding die 10 is a rotary die plate aligning means for aligning the rotary die plate 20 so as to rotate at an accurate angle with respect to the lower original plate 12 and includes four alignment pins 23, And has an alignment pin hole (17). The four alignment pins 23 are arranged at the same distance and the same angular interval, that is, at intervals of 90 degrees, with respect to the rotation center line RL, i.e., the rotary shaft 21, And is tapered. The four alignment pin holes 17 are formed so that four alignment pins 23 can be inserted one by one on the upper surface of the lower disk 12. That is, the four alignment pin holes 17 are spaced apart from the shaft connection hole 15 by a distance equal to the distance between the alignment pin 23 and the rotary shaft 21, Respectively.

The rotary shaft 21 is pushed up so that the rotary mold plate 20 rotates slightly away from the lower original plate 12 when the rotary mold plate 20 rotates by 180 degrees with respect to the rotation center line RL When the rotary mold plate 20 and the lower circular plate 13 are brought into contact with each other again, the rotary mold plate 20 is brought into contact with the rear mold plate 20. At this time, the four alignment pins 23 are inserted into the four alignment pin holes 17, It is rotated by exactly 180 degrees. Thereby, the two lower core portions 30 in the primary injection position IC1 are moved to the secondary injection position IC2, and the two lower core portions 30 in the secondary injection position IC2 are moved And moves to the primary injection position IC1. 3, the dual injection molding die of the present invention may have an alignment pin in the lower circular plate 12 and an alignment pin hole in the rotary die plate 20. [

The upper mold 40 has an upper mold base 41, an upper circular plate 46, two primary upper core portions 60, and two secondary upper core portions 90. The upper mold base 41 supports the upper circular plate 46 and has a primary injection sprue bushing (not shown) which is an inlet through which the primary molten resin is injection-injected from the outside of the mold 10 to the inside during the primary injection a sprue bush 42 and a secondary injection sprue bush 44 as an inlet through which the secondary molten resin is injection-injected from the outside of the mold 10 to the inside during the secondary injection.

The upper disk 46 supports the primary upper core portion 60 and the secondary upper core portion 90. The primary upper core portion 60 is provided in the primary injection position IC1 and has the shape of the intermediate yarn introduction 2 (see FIG. 1) molded by injecting the primary molten resin at the primary injection position IC1 . The primary upper core portion 60 includes eight horizontally movable core pieces 65 that are horizontally movable to form an undercut 7 (see FIG. 1) in the intermediate article 2 (see FIG. 1) And an upper supporting core piece 61 (see FIG. 5) which supports the eight horizontal moving core pieces 65 and is fixed to the upper circular plate 46.

The eight horizontal moving core pieces 65 are arranged radially with respect to the center of the primary injection position IC1. When the upper mold 40 is lowered and brought into close contact with the lower mold 11, the eight horizontal moving core pieces 65 are pinched toward the center of the primary injection position IC1, The upper side surface shape of the upper surface of the substrate W is limited. In order to form an undercut 7 (see Fig. 1) in the form of a through hole, on the surface of the horizontally moving core piece 65 which defines the lateral shape on the intermediate blanks 2, A projection 67 is formed. The undercut protrusion 67 is in close contact with the protrusion surface 32 of the lower core part when the upper mold 40 and the lower mold 11 are in close contact with each other. A further description of the primary upper core portion 60 will be described below with reference to Figs. 5 and 6. Fig.

The secondary upper core portion 90 is molded by injecting the secondary molten resin into the intermediate yarn 2 (see Fig. 1) adhering to the lower core portion projecting face 32 at the secondary injection position IC2 Thereby defining the shape of the upper side of the final product (1). The surface defining the shape of the upper side of the finished article 1 of the secondary upper core portion 90 is a concave surface 92 corresponding to the lower core portion projecting surface 32. A further description of the secondary upper core portion 90 will be described below with reference to FIGS. 7 and 8. FIG.

When the upper mold 40 is lifted and separated from the lower mold 11, the final injection article 1 (see FIG. 1) injection-molded is adhered to the concave surface 92 of the second upper core portion 90 The upper mold 40 includes eject pins 56 and 57 (FIGS. 7 and 8) projecting downward to separate the final product 1 from the concave surface 92 of the second upper core portion 90 8). An ejection pin actuator 50 is mounted on the side surface of the upper mold 40 to allow the upper end portion 51 to move up and down. The upper end portion 51 of the ejection pin actuator 50 includes a horizontal extension block 52 extending into the upper mold 40 And is fastened to the one side end portion. The other end of the horizontal extension block 52 is fastened to an eject pin support plate 54 (see FIGS. 7 and 8) disposed in a space above the secondary upper core portion 90. The eject pins 56 and 57 are supported by the eject pin support plate 54 and extend down through the secondary lower core portion 90. The eject pin actuator 51 can lower the upper end portion 51 and project the end of the ejection pins 56 and 57 below the concave surface 92 of the secondary upper core portion 90 1 can be separated from the concave surface 92 of the secondary upper core portion 90.

The dual injection molding die 10 is an upper mold aligning means for aligning the upper mold 40 so that the upper mold 40 is brought into close contact with the lower mold 11 precisely so that the alignment protrusions 48, the auxiliary alignment protrusions 49, Respectively. The aligning protrusions 48 are provided on the pair of side surfaces of the four sides of the upper mold 40 and are installed to protrude toward the lower mold 11. [ The auxiliary aligning protrusions 49 are provided on the side faces of the remaining one of the four side faces of the upper mold 40 and are installed to protrude toward the lower mold 11. [

The alignment protrusion receiving portion is formed so that a pair of alignment protrusions 48 can be received in the lower mold 11. [ More specifically, the aligning projection accommodating portion includes a lower disk aligning groove 13 formed in the lower disk 12 so as to be aligned with the aligning projection 48, and four aligning pins 23 arranged in four alignment pin holes 17 And a rotary mold plate alignment groove 25 formed in the rotary mold plate 20 so as to be aligned with the alignment protrusions 48 and the lower circular plate alignment grooves 13 only when the rotary mold plate 20 is sandwiched therebetween. On the other hand, when the four aligning pins 23 are fitted in the four aligning pin holes 17, the rotary die plate 20 is provided with a pair of rotary mold plates An alignment groove 25 is further provided.

When the upper mold 40 descends and approaches the lower mold 11, a pair of alignment protrusions 48 are fitted in the rotating mold plate alignment groove 25 and the lower disc alignment groove 13 aligned in a row, The upper mold 40 is brought into close contact with the lower mold 11 in an accurately aligned state when a pair of auxiliary alignment projections 49 are fitted and fitted in the remaining rotating mold plate alignment grooves 25. [ The alignment protrusions 48 and the auxiliary alignment protrusions 49 are not seated on the lower mold 11 unless the upper mold 40 is accurately aligned with respect to the lower mold 11. Therefore, 11 without being brought into close contact with each other. Therefore, problems such as damage to the mold 10 or generation of defective products caused by the close contact of the upper mold 40 and the lower mold 11 without alignment are prevented in advance.

5 and 6 are sectional views sequentially showing the opening and closing of the mold at the primary injection position when the double injection molding operation is performed using the double injection molding die of FIG. 2. FIGS. 7 and 8 are views showing the double injection molding Sectional view sequentially showing the opening and closing of the mold at the secondary injection position when the double injection operation is performed using the mold. Hereinafter, the process of forming the final molded article 1 (see FIG. 1) using the dual injection molding die 10 (see FIGS. 2 and 4) will be sequentially described with reference to FIGS.

5, eight horizontal moving core pieces 65 are fastened to the upper supporting core piece 61 by connecting rods 70 extending downwardly slanting away from the center line of the primary injection position IC1 The compression spring 72 is inserted into the connection rod 70 and interposed between the upper supporting core piece 61 and the horizontal moving core piece 65. [ When the upper mold 40 is separated from the lower mold 11, the compression spring 72 is expanded so that the eight horizontal moving core pieces 65 are spaced apart from the upper supporting core pieces 61, (65).

On the outside of the eight horizontal moving core pieces 65, a guide rail 74 extending downward in the same direction as the connecting rod 70 is mounted. Each guide rail 74 is slidably engaged in the same direction as the extending direction of the guide rail 74 with respect to the outer supporting core piece 63 fixed to the upper original plate 46. An adjacent pair of horizontally mobile core pieces 65 are connected to each other by a slide link 78 (see FIG. 4). The guide rails 74 guide the outer supporting core piece 63 and the upper original plate 46 to slides down or up without being caught by the horizontally moving core pieces 65 when the upper mold 40 is lowered or raised. do. The slide link 78 guides the adjacent horizontally moving core pieces 65 to be closely contacted or spaced in an aligned state when the upper mold 40 is lowered or raised.

When the upper mold 40 descends toward the lower mold 11, the lower ends of the eight horizontally moving core pieces 65 are first brought into contact with the lower core portion 30 and the downwardly projecting moving hooks 76 are moved by the moving hook guides Groove 36 (see Fig. 4). When the upper mold 40 is continuously lowered, the compression spring 72 is compressed so that the upper supporting core piece 61 is close to the eight horizontal moving core pieces 65 and the connecting rod 70 is connected to the upper supporting core piece 61 ). As a result, the eight horizontal moving core pieces 65 that are in contact with the lower core portion 30 are horizontally moved toward the centerline of the primary injection position IC1.

6, when the upper mold 40 is continuously lowered and the upper supporting core piece 61 is brought into close contact with the eight horizontal moving core pieces 65, the eight horizontal moving core pieces 65 are completely brought into close contact with each other So that the primary injection cavity C1 is defined. At this time, the undercut projection 67 is in close contact with the lower core portion projecting surface 32. On the other hand, as the eight horizontal moving core pieces 65 horizontally move toward the centerline of the primary injection position IC1, the moving hooks 76 move along the moving hook guide grooves 36, Respectively.

In this state, when the primary injection molten resin is injected into the mold 10 through the primary injection sprue bush 42 (see FIG. 2), a primary injection runner (runner) (80), the primary molten injection resin flows into the gate (34) and diffuses into the primary injection cavity (C1). Since the movable hook 76 and the fixed hook 35 are fastened to each other, the primary injection cavity C1 is not opened in spite of the impact when the molten resin is injected.

1) is formed when the primary injection molten resin filled in the primary injection cavity C1 is cured. When the upper mold 40 is lifted, the middle injection part 2 The article (2) is stuck. When the upper mold 40 rises, the compression spring 72 is resiliently restored so that the eight horizontally movable core pieces 65 are spaced apart from each other, and are also separated from the upper support core piece 61. Also, the movable hook 76 is separated from the fixed hook 35 so that the upper mold 40 is not interrupted.

The rotary mold plate 20 (see FIG. 4) is rotated by 180 degrees with the upper mold 40 and the lower mold 11 being spaced apart from each other so that the intermediate transfer article 2 (See FIG. 1) is taken out at the secondary injection position IC2, and the two lower core portions 30 are moved to the secondary injection position IC2 at the secondary injection position IC2 The two lower core portions 30 move to the primary injection position IC1.

7, when the upper mold 40 is lowered again toward the lower mold 11, the secondary upper core portion 90 is brought into close contact with the lower core portion 30 at the secondary injection position IC2, The injection cavity C2 is defined. In the secondary injection cavity C2, an intermediate article 2 adhered to the lower core portion projecting surface 32 is disposed. When the secondary injection molten resin is injected into the mold 10 through the secondary injection sprue bush 44 (refer to FIG. 2) in this state, the secondary injection molten resin is injected into the mold 10 through the secondary injection runner the secondary injection molten resin is injected into the secondary injection cavity C2 through the runner 95 to be diffused. The molten resin injected into the secondary injection cavity C2 also flows into the undercut 7 in the form of a through hole of the intermediate product 2 to close the through hole.

When the secondary injection molten resin filled in the secondary injection cavity C2 is cured, an end product 1 (see Fig. 1) in which the additional article 3 and the intermediate article 2 are integrally joined is formed. The runner waste 6 formed by curing the molten resin left in the runner 95 and the bolt fastening portion 5 protruding upward can prevent the surface area of the lower core portion projecting surface 32 from becoming larger than the surface area of the lower core portion projecting surface 32, The surface area of the concave surface 92 of the concave surface 92 of the upper mold 40 is larger than that of the concave surface 92 of the concave surface 92 when the upper mold 40 is raised again.

8, when the upper end 51 of the eject pin actuator 50 is lowered in a state in which the upper mold 40 is raised, the horizontal extension block 52, the eject pin support plate 54, The pins 56 and 57 descend and the lower ends of the eject pins 56 and 57 protrude below the concave surface 92 so that the finished article 1 is pressed against the concave surface 92 of the second upper core portion 90, Lt; / RTI > One of the eject pins 56 and 57 pushes the upper end of the bolt fastening part 5 down and the other one pushes the surface of the final product 1 next to the bolt fastening part 5 downward It pushes. The worker can take out the final product 1 separated from the concave surface 92 and the rotary mold plate 20 (see Fig. 2) can be rotated 180 degrees again to return to the original position.

4 has a structure for forming an undercut in the first upper core portion 60 to form an undercut 7 (see FIG. 1) on the intermediate article 2 (see FIG. 1) 1) is formed, but the present invention is not limited thereto. For example, a configuration for forming an undercut may be provided in the second upper core portion so that an undercut can be formed on the outer surface of the final product.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

1: Final product 2: Intermediate product
10: Double injection molding mold 11: Lower mold
12: lower original plate 13: lower original plate aligned groove
17: Alignment pin hole 20: Rotary mold plate
23: alignment pin 25: rotary mold plate alignment groove
30: lower core part 40: upper mold
48: alignment protrusions 56, 57: eject pin
60: primary upper core portion 90: secondary upper core portion

Claims

A first upper core portion defining a shape of an intermediate blanket molded by injecting a first molten resin at a first injection position and a second upper molybdenum portion injecting a second molten resin into the intermediate blanket at a secondary injection position An upper mold having a second upper core portion defining a shape;
And a lower core portion corresponding to the first upper core portion and the second upper core portion and arranged to face the upper mold and to move the intermediate blanks molded at the primary injection position to the secondary injection position A lower mold having a rotary mold plate rotating at a predetermined angle and a lower circular plate supporting the rotary mold plate;
Rotating mold plate aligning means for aligning and guiding the rotary mold plate at an accurate angle with respect to the lower original plate; And
And upper mold alignment means for aligning the upper mold so as to be in close contact with the lower mold,
The rotating mold plate aligning means includes a plurality of alignment pins projected from one of the rotary mold plate and the lower circular plate toward the other, and the plurality of alignment pins are fitted to the other one of the rotary mold plate and the lower circular plate Wherein the mold has a plurality of aligned pin holes.

The method according to claim 1,
The upper mold alignment means may include a plurality of alignment protrusions protruding from one of the upper mold and the lower mold toward the other, and a plurality of alignment protrusions formed in the other of the upper mold and the lower mold so as to be able to receive the plurality of alignment protrusions And an alignment projection accommodating portion which is formed in the mold.

The method according to claim 1,
The first upper core portion includes a horizontal moving core piece that is horizontally movable so that an undercut is formed in the intermediate yarn product,
A plurality of horizontally moving core pieces are provided, and the plurality of horizontally moving core pieces are radially disposed with respect to a center of the primary injection position,
Wherein when the upper mold and the lower mold are in close contact with each other, the plurality of horizontally moving core pieces are pinched toward the center of the primary injection position to define an upper side shape of the intermediate product. .

The method according to claim 1,
Wherein the secondary upper core portion comprises a horizontally movable core piece that is horizontally movable to form an undercut in the final article of manufacture.

The method according to claim 1,
Wherein when the upper mold and the lower mold are separated from each other, the final product is adhered to the second upper core portion,
Wherein the upper mold has an eject pin projected downward to separate the final product from the secondary upper core.

The method according to claim 1,
Wherein the plurality of alignment pins are provided in one of the rotary die plate and the lower circular plate so as to be arranged at the same distance and at equal angular intervals from the rotation center of the rotary die plate,
Wherein the plurality of alignment pin holes are provided in the other one of the rotary die plate and the lower circular plate so as to be arranged at the same distance and at equal angular intervals from the center of rotation of the rotary die plate.

3. The method of claim 2,
The alignment protrusion receiving portion includes a lower disc alignment groove formed in the lower disc and aligned with the alignment protrusion,
And a rotary mold plate alignment groove formed on the rotary mold plate and aligned with the alignment protrusion and the lower disc alignment groove only when the alignment pin is fitted in the alignment pin hole. mold.