WO2024048929A1

WO2024048929A1 - Mold for injection molding

Info

Publication number: WO2024048929A1
Application number: PCT/KR2023/008167
Authority: WO
Inventors: 김민규; 박미지; 백향희
Original assignee: 삼성전자 주식회사
Priority date: 2022-09-01
Filing date: 2023-06-14
Publication date: 2024-03-07
Also published as: KR20240031691A

Abstract

According to one embodiment of the present disclosure, a mold for injection molding may comprise: a first core; a second core configured to form at least a portion of a cavity by being coupled to face the first core as the second core moves along a first direction; a plurality of third cores which are arranged on the first core and can move in a second direction forming an angle with the first direction, and which are configured to surround at least a portion of the cavity at the time the second core is coupled to face the first core (hereinafter, a mold close state); and a plurality of support pins which are arranged on the first core and support the third cores. In one embodiment, in the mold close state, the support pins may be configured to support one of the third cores that corresponds, so as to put same in close contact with the second core. Various other embodiments may also be possible.

Description

Mold for injection molding

Embodiment(s) of the present disclosure relate to molds, for example, to molds in which three or more cores are combined.

Injection molding may be a molding device that injects molten resin into a molding space (e.g., cavity) formed by combining a plurality of cores (e.g., two or more) to produce an injection product of a shape corresponding to the molding space. . For example, the injection mold may include a mold device including a plurality of cores that are coupled to each other and provide a molding space corresponding to the shape of the injection product, and an injection device that injects molten resin into the molding space. Injection molding using these molds can be useful for mass production of products at a relatively low cost.

A mold can generally form a cavity by combining a pair of cores facing each other (hereinafter referred to as 'mold closure'). In the production of simple-shaped injection molded products, they can be manufactured using a mold containing a pair of cores. For example, when the shape of the injection product is simple, it may be easy to separate the injection product from the cavity or core(s) after molding. If decorations such as engravings or patterns, or structures such as grooves, protrusions, and/or hooks for binding to other parts are created on the surface, it may be difficult to separate the injection molded product from the cavity or core(s) after molding. When molding injection molded products of such complex shapes, the mold may include a larger number of core structures. For example, the complexity of the process or mold may increase depending on the shape of the injection product, but injection molding can provide an environment in which products of various shapes can be manufactured.

Injection molding technology is not only used for manufacturing products using synthetic resin, but also allows for molding injection-molded products with parts of different materials (hereinafter referred to as 'inserts') embedded through insert injection. For example, by injecting molten resin while metal parts such as hooks, screws, or fastening bosses are already placed inside the mold, the injection molded product can be molded and the metal parts can be embedded or embedded in the injection molded product. By embedding the metal parts listed above, the injection-molded product can be easily combined with other parts, and depending on the shape or material of the embedded metal part, the injection-molded product can be given additional strength or electrical functions.

The above information may be provided as background technology for the purpose of aiding understanding of the present disclosure. No claim or determination is made as to whether any of the foregoing may apply as prior art with respect to the present disclosure.

According to one embodiment of the present disclosure, a mold for injection molding includes a first core and a second core configured to face the first core and form at least a portion of a cavity as it moves along a first direction. A core, disposed on the first core and capable of moving in a second direction inclined to the first direction, when the second core is coupled to face the first core (hereinafter, 'mold-closed state'), at least one of the cavity It may include a plurality of third cores configured to partially surround the first core, and a plurality of support pins disposed on the first core to support the third core. In one embodiment, in the mold closing state, the support pins may be configured to support a corresponding one of the third cores and bring it into close contact with the second core.

According to one embodiment of the present disclosure, a mold for injection molding includes a first core and a second core configured to face the first core and form at least a portion of a cavity as it moves along a first direction. A core, disposed on the first core and capable of moving in a second direction inclined to the first direction, when the second core is coupled to face the first core (hereinafter, 'mold-closed state'), at least one of the cavity a plurality of third cores configured to partially surround the first core, and configured to support the third core, thereby bringing a corresponding one of the third cores into close contact with the second core in a mold-closed state. It may include a plurality of support pins. In one embodiment, the third core may include at least one protrusion or at least one groove formed on a surface surrounding the cavity.

The above-described or other aspects, configurations and/or advantages of an embodiment of the present disclosure may become clearer through the following detailed description with reference to the accompanying drawings.

1 is a diagram showing a mold for injection molding according to an embodiment of the present disclosure.

FIG. 2 is a diagram showing a portion of the injection molding mold of FIG. 1 according to an embodiment of the present disclosure.

FIG. 3 is a perspective view showing a portion of the injection molding mold of FIG. 1 according to an embodiment of the present disclosure.

FIG. 4 is a diagram showing the arrangement of third cores in the injection molding mold of FIG. 1 according to an embodiment of the present disclosure.

FIG. 5 is a diagram illustrating an operation of separating gate water from the injection molding mold of FIG. 1 according to an embodiment of the present disclosure.

FIG. 6 is a diagram showing a gate water separation structure in the injection molding mold of FIG. 1 according to an embodiment of the present disclosure.

FIGS. 7, 8, 9, 10, 11, 12, and 13 are views sequentially showing the operation of molding an injection product using the injection molding mold of FIG. 1 according to an embodiment of the present disclosure. am.

Throughout the accompanying drawings, similar parts, components and/or structures may be assigned similar reference numbers.

By injecting and curing molten resin in a mold-closing state, a trace called a 'parting line' may be created on the surface of an injection molded product, for example, at the boundary where cores contact each other. This parting line can be managed through precise manufacturing of the core(s) and control of the adhesion of the cores in the injection molding process. However, in the insert injection process, there may be difficulty in controlling the adhesion of the cores depending on the manufacturing tolerance of the insert. For example, if the insert is manufactured to the maximum size within the allowable tolerance range, the adhesion of the cores that face each other may be reduced. In this case, the parting line may become larger due to the injection pressure of the molten resin, or foreign substances called 'flash' or 'burr' may be created on the surface of the injection molded product. As the shape of the injection molded product to be manufactured becomes more complex, the number and distribution of parting lines (or cores) may increase, and the likelihood of foreign matter occurring on the surface of the injection molded product may increase during insert injection. For example, the manufacturing cost of an injection-molded product may increase due to post-processing to remove foreign substances.

One embodiment of the present disclosure is intended to solve at least the problems and/or disadvantages described above and provide at least the advantages described later, and provides a mold that can suppress the generation of foreign substances such as flash or burrs on the surface of the injection molded product. You can.

One embodiment of the present disclosure can provide a mold that can reduce manufacturing costs by minimizing post-processing after injection molding.

The technical problem to be achieved in this document is not limited to the technical problem mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

The following description in conjunction with the accompanying drawings may provide an understanding of various exemplary implementations of the present disclosure, including the claims and corresponding content. The example embodiments disclosed in the following description include numerous specific details to aid understanding, but are considered to be one of a variety of example embodiments. Accordingly, a person skilled in the art will understand that various changes and modifications to the various implementations described in this document can be made without departing from the scope and technical spirit of the disclosure. Additionally, descriptions of well-known functions and configurations may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are not limited to a referential meaning and may be used to clearly and consistently describe an embodiment of the present disclosure. Accordingly, it will be clear to those skilled in the art that the following description of various implementations of disclosures is provided for illustrative purposes and not for the purpose of limiting the scope of rights and disclosures stipulating equivalents.

Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" shall be understood to include plural meanings. Thus, for example, “component surface” may be understood to include one or more of the surfaces of the component.

Figure 1 is a diagram showing a mold 100 for injection molding according to an embodiment of the present disclosure. FIG. 2 is a diagram showing a portion of the injection molding mold 100 of FIG. 1 according to an embodiment of the present disclosure.

1 and 2, the mold 100 supports the first core 101, the second core 102, a plurality of third cores 103, and/or the third core 103. It may include pins 139a. By moving along the first direction D1, the second core 102 is coupled to the first core 101 to face each other (hereinafter referred to as 'mold closure' or 'mold closure state') and forms a cavity (C; Figure 4 or Figure 9). reference), and the third cores 103 may be arranged to surround at least a portion of the cavity C between the first core 101 and the second core 102. Depending on the arrangement of the mold 100, the first direction D1 may be referred to as a horizontal direction or a vertical direction. For example, the first direction D1 may be understood as a horizontal direction in FIG. 1 and as a vertical direction in FIG. 2 . In one embodiment, the first core 101 may be referred to as the 'lower core' and the second core may be referred to as the 'upper core'.

According to one embodiment, the third cores 103 are disposed on the first core 101 and may move along a second direction D2 that is inclined or intersects the first direction D1. “Direction inclined with respect to A” may refer to a direction forming an acute or obtuse angle with respect to A, for example. For example, the third cores 103 may move on the first core 101 in a direction other than perpendicular to or parallel to the first direction D1. In one embodiment, the third cores 103 may be at least partially disposed or aligned on the first core 101 on a side opposite the second core 102 . For example, in the mold closing state, the third cores 103 are arranged to at least partially surround at least a portion of the molding space (e.g., cavity C) between the first core 101 and the second core 102. It can be. As will be seen with reference to FIG. 4 , the third cores 103 may be arranged on one side of the first core 101 to form a closed curve or polygonal trajectory. According to one embodiment, in the mold-closing state, the third cores 103 may be arranged to form a closed curve or polygon on one side of the first core 101.

According to one embodiment, the support pins 139a may be disposed on the first core 101 to support the third core 103(s). For example, the support pins 139a may support a corresponding one of the third cores 103. In one embodiment, the support pins 139a may support the third core 103(s) and thereby bring them into close contact with the second core 102 when the mold is in a closed state. For example, when the second core 102 is coupled to face the first core 101, the third cores 103 move in the second direction D2 by contacting the second core 102, and the support pins (139a) may substantially support or pressurize the third core 103. In one embodiment, when the mold is in a closed state (e.g., when the second core 102 is in contact with the third core 103(s)), the support pins 139a and/or the third core 103 ) As a portion of the third core 103(s) is compressed, the third core(s) 103(s) may come into closer contact with the second core 102. Accordingly, when the mold 100 performs the insert injection process, the second core 102 and the third core 103 are maintained in close contact regardless of the manufacturing shape or size of the insert, thereby forming the injection molded product (e.g., Figures 11 to 11). The generation of parting lines and/or foreign substances on the surface of the insert molded product 105 of FIG. 13 can be suppressed.

According to one embodiment, the mold 100 includes

core bases

111 and 121, a heating base 123, a push base 145 and/or a support base ( support base) (139b) may be further included. The core bases 111 and 121 are, for example, structures for arranging or supporting the first core 101 and the second core 102 and, although not shown, have holes or grooves for injecting or supplying molten resin. (For example,

gate grooves

113 and 131b in FIG. 6) may be provided in at least one of the core bases 111 and 121. Depending on the embodiment, the

gate grooves

113 and 131b may be provided on the

cores

101, 102 and 103 themselves. In this case, the core bases 111 and 121 may have holes or grooves for injecting molten resin. It may be omitted. The heating base 123 may be disposed, for example, on the second core 102 or on the second core base 121 supporting the second core 102, and may be placed on the second core 102 before the molten resin is injected. The fluidity or viscosity of the molten resin can be maintained by preheating the second core 102 and/or the first core 101. In one embodiment, the push base 145 may move toward or away from the first core 101 along the first direction D1 on the side opposite to the second core 102 . For example, after molding is completed, when the cavity C is opened, the insert molded product 105 may be separated or taken out from the cavity C by moving the push base 145. This will be examined again through FIGS. 7 to 13. In one embodiment, the support base 139b is a structure in which one end of the support pins 139a is fixed, and the support pins 139a are substantially disposed between the support base 139b and the first core 101 to form the first core 101. Can support 3 core 103(s).

According to one embodiment, the above-described

bases

111, 121, 123, 145, and 139b may be formed by combining multiple plates or multiple structures, taking into account the specifications or assembly structure of the mold to be manufactured. It can be implemented in various ways. For example, a plurality of heating bases 123 may be provided so that at least one selected depending on the heating temperature or the distance from the second core 102 operates. In one embodiment, a rotation block 149 (s) or a second take-out pin 143 (s), which will be described later, may be disposed on the push base 145, and the rotation block 149 or the second take-out pin 143 may be disposed on the push base 145. ) For assembly, the push base 145 may be implemented by combining a plurality of plates. Although not directly mentioned, the core bases 111 and 121(s) or the support base 139b may be implemented by combining a plurality of structures similar to the heating base 123 or the push base 145.

According to one embodiment, the mold 100 may further include first take-out pins 141(s) and/or second take-out pins 143(s). After molding is completed, the molded product (e.g., the insert molded product 105 in FIGS. 11 to 13) or the remaining cured resin material (e.g., the gate material 159 in FIGS. 5, 12, or 13) is pulled into the first eject pin. It can be separated or taken out from the mold 100 by the (141) (s) or the second take-out pin (143) (s). The first take-out pin 141(s) and/or the second take-out pin 143(s) are substantially disposed on the push base 145 and can move in the first direction D1. In one embodiment, the first take-out pin 141 moves in the first direction D1 on the cavity C, thereby moving to the outside of the first core 101 (e.g., the direction in which the second core 102 is disposed or space) can appear. For example, after the second core 102 moves away from the first core 101, the first take-out pin 141 moves in the first direction D1 by the push base 145 and moves the first core (102) away from the first core 101. 101) The molding can be separated from the bed. In one embodiment, the second take-out pin 143 may be disposed on the first core 101 in a state that can reciprocate along the first direction D1 in an area outside the cavity C. For example, after the second core 102 moves away from the first core 101, the second take-out pin 143 moves in the first direction D1 by the push base 145 to remove the first core 101. The gate water 159 can be separated on the core 101. For example, the second take-out pin 143 is disposed in an area outside the cavity C, but is substantially on the gate groove formed in the first core 101 (e.g., the first gate groove 113 in FIG. 6). By appearing and disappearing, the gate water 159 remaining in the gate groove can be separated or discharged.

According to one embodiment, the mold 100 may further include a rotation block 149 that rotates within the push base 145. The rotation block 149 may rotate according to the movement of the push base 145 and move the second take-out pin 143 in the first direction D1. For example, the second take-out pin 143 may move in the first direction D1 by the push base 145 and may further move in the first direction D1 by rotation of the rotation block 149. . In one embodiment, the second take-out pin 143 may have a shorter length than the first take-out pin 141 . For example, as the push base 145 moves, the first take-out pin 141 first protrudes on the first core 101 to separate the molded product from the cavity (C), and the molded product is separated from the cavity (C). As the second take-out pin 143 protrudes onto the first core 101 by rotation of the post-rotating block 149, the gate water 159 can be separated from the

gate grooves

113 and 131b. In one embodiment, the range in which the second take-out pin 143 moves by the push base 145 is substantially the same as that of the first take-out pin 141, while the length is small and moves later than the first take-out pin 141. It may protrude onto the first core 101. In one embodiment, at or after the molded product is separated by the first take-out pin 141, the rotation block 149 rotates to further move the second take-out pin 143 in the first direction D1. there is. For example, it has a length smaller than the first take-out pin 141, but moves in the first direction D1 in a larger range than the first take-out pin 141 by the rotation block 149, so that the second take-out pin 143 ) can separate or discharge the hardened gate water 159. The rotation of the rotation block 149 and the resulting movement of the second take-out pin 143 will be examined again with reference to FIG. 5 .

FIG. 3 is a perspective view showing a portion of the injection molding mold of FIG. 1 (eg, the mold 100 of FIG. 1 or FIG. 2) according to an embodiment of the present disclosure. FIG. 4 is a diagram showing the arrangement of the third cores 103 in the injection molding mold 100 of FIG. 1 according to an embodiment of the present disclosure.

Referring to FIGS. 3 and 4 , the third core 103 may include a core frame 131a and a guide plate 133 extending from the core frame 131a. For example, the core frame 131a may be a structure substantially disposed on one surface of the first core 101 and disposed on at least a portion of the perimeter of the cavity C. In one embodiment, the core frame 131a has at least one protrusion (e.g., protrusion 135a in FIG. 7) or at least one groove (e.g., protrusion 135a in FIG. 7) surrounding the cavity C or formed on a surface in contact with the cavity C. : May include groove 135b in FIG. 7). The protrusions 135a or grooves 135b may, for example, provide a decorative effect on the surface of a molding to be manufactured, or may function as a binding structure when the molding is assembled with another structure. In one embodiment, the guide plate 133 extends from the core frame 131a and is substantially a part of the third core 103 disposed inside the first core 101 while moving the third core 103. can guide you.

According to one embodiment, four third cores 103 (eg, core frame 131a) may be arranged to form a closed curve or polygonal shape. For example, the core frames 131a may be arranged to form a substantially rectangular closed loop. In one embodiment, the inclination directions of the guide plates 133 may be different depending on the position or direction in which the third core 103 is disposed, but this will be easily understood by those skilled in the art, so for the sake of brevity of explanation, " The guide plates 133 may be referred to as “disposed substantially parallel to the second direction D2.” In FIG. 3, when the mold closing state is reached, the second core 102 may contact the third core 103 (eg, core frame 131a) or pressurize the third core 103. For example, in the mold closing state, the third core 103 may be supported or pressed between the second core 102 and the support pins 139a(s). In one embodiment, due to the arrangement structure of the guide plates 133, when in contact with the second core 102, the third core 103 moves substantially in the second direction D2 and moves against another adjacent third core. You can gradually get closer to (103).

According to one embodiment, the position of the core frame 131a(s) illustrated by the dotted line in FIG. 4 illustrates the position of the third core 103 or the core frame 131a in the state before mold closing, and the position of the third core 103 or core frame 131a in the mold closing state. The three cores 103 (eg, core frame 131a) may be arranged to form a closed curve by substantially contacting or closely contacting another adjacent third core 103. For example, in a mold-closing state, the first core 101, second core 102, and/or third core 103(s) may form or maintain the cavity C as a substantially sealed space. In one embodiment, the third core 103 may be supported by the support pin 139a and remain in close contact with the second core 102 while moving within a designated range on the first core 101. For example, the range in which the third core 103 can move (e.g., the first gap F in FIG. 7) accommodates the manufacturing tolerance of the insert (e.g., the insert 151 in FIG. 8 or FIG. 9). Although it has a sufficient size, an adhesion force greater than the pressure of the molten resin acting in injection molding can be generated between the second core 102 and the third core 103. By maintaining an adhesion force greater than the injection pressure between the second core 102 and the third core 103, the generation of foreign substances such as parting lines or flash can be suppressed.

According to one embodiment, the movement range of the third core 103 is substantially within a range of approximately 2-3 mm, considering the manufacturing tolerance of the insert 151. Movement or restoration of the position of the third core 103 in the second direction D2 is substantially implemented by the elastic force of the guide plate 133 and/or the support pin 139a itself (e.g., compression and/or or elastic restoration). There may be some differences depending on the product to be manufactured or the injection pressure in the process, but in general, the mold 100 can have a clamping force of approximately 200 tons in a mold-closed state. The material and manufacturing specifications of the third core 103 or the support pin 139a may be determined by considering the clamping force of the mold 100 and compression and/or elastic recovery during repeated injection molding. For example, even if they have the same elastic modulus, if the guide plate 133 and/or the support pin 139a are manufactured too thick, they are not compressed by an appropriate amount in the mold-closing state, and thus other structures (e.g., the second core 102) Excessive load may be applied to. If the guide plate 133 and/or the support pin 139a are manufactured too thin, the load may be concentrated on the weak portion, causing permanent deformation or damage. For example, the actual manufacturing specifications of the third core 103 or the support pin 139a can be implemented in various ways considering the selected material or the purpose and structure of the mold.

FIG. 5 is a diagram illustrating an operation of separating the gate water 159 from the injection molding mold of FIG. 1 (e.g., the mold 100 of FIG. 1 or FIG. 2 ) according to an embodiment of the present disclosure. FIG. 6 is a diagram illustrating a structure for separating the gate water 159 from the injection molding mold 100 of FIG. 1 according to an embodiment of the present disclosure.

Referring to FIGS. 5 and 6 , the mold 100 may include a gate (or gate groove) provided on the first core 101 . The gate groove is, for example, a passage for injecting molten resin into the cavity C, and includes at least one first gate groove 113 formed in the first core 101 in an area away from the cavity C, and 3 It may include a second gate groove 131b formed across the core 103 (e.g., the core frame 131a of FIG. 3 or 4). For example, the second gate groove 131a may connect the first gate groove 113 to the cavity C. Depending on the embodiment, these

gate grooves

113 and 131b may bypass the third core 103 and penetrate the first core 101, or may penetrate the second core 102 and be directly connected to the cavity C. there is. In one embodiment, in a structure in which the gate groove is formed on the surface of the first core 101 or the third core 103, when the second core 102 moves away from the first core 101, the

gate groove

113 , 131b) or the remaining gate water 159 is substantially exposed to the external space, so it may be easy to separate or discharge the gate water 159.

According to one embodiment, after molding, while the second core 102 moves away from the first core 101, the push base 145 may move in a direction closer to the first core 101. . As the push base 145 moves in a direction closer to the first core 101, the first take-out pin 141 and/or the second take-out pin 143 may move together. The first take-out pin 141 is shorter than the second take-out pin 143, and protrudes onto the cavity C before the second take-out pin 143, forming a molded product (e.g., the insert molded product 105 of FIGS. 11 to 13). ) can be separated from the first core 101.

According to one embodiment, an interference block 119 may be further disposed on the core bases 111 and 121, for example, the first core base 111 supporting the first core 101. When the push base 145 continues to move in the direction of protruding the take-out

pins

141 and 143 on the first core 101, the interference block 119 interferes with the rotation block 149, thereby causing the rotation block 149 to rotate. It can be rotated. For example, in some sections of the range in which the push base 145 moves, the interference block 119 may interfere with the rotation block 149, causing the rotation block 149 to rotate. In one embodiment, the rotation block 149 may be substantially in contact with or supported by the second take-out pin 143 and rotated by the interference block 119 in the first direction D1, for example, the push base. The second take-out pin 143 can be further moved in the direction in which (145) moves. Accordingly, after the first take-out pin 141 separates the molded product from the cavity C, the second take-out pin 143 moves further by the rotating block 149 to move the gate water 159 into the gate groove 113, It can be separated from 131b). For example, the second take-out pin 143 may substantially appear on the first gate groove 113.

According to one embodiment, when a plurality of second take-out pins 143 are arranged adjacently, one interference block 119 can rotate two or more rotation blocks 149 simultaneously. In one embodiment, when a plurality of first cores 101 are disposed adjacent to each other, or when one first core 101 provides two cavities C adjacent to each other, one gate branches out. This allows molten resin to be injected into two cavities (C) at the same time. In one embodiment, a second take-out pin 143 may be disposed in each of the branched gates (e.g., the first gate groove 113). In this case, one interference block 119 is connected to two rotation blocks 149. ) Alternatively, the second take-out pin can be rotated or moved simultaneously.

Hereinafter, with reference to FIGS. 7 to 13, we will look at the operation of the mold 100 to perform insert injection. In the description of the operation of performing insert injection, the mold 100 of FIGS. 1 to 6 described above may be substantially referred to.

7 to 13 are diagrams sequentially showing the operation of molding an injection product using the injection molding mold of FIG. 1 (e.g., the mold 100 of FIG. 1 or FIG. 2) according to an embodiment of the present disclosure. .

In the embodiments described later, insert injection is used as an example, but it should be noted that the mold according to the embodiment of the present disclosure can be used for injection molding using molten resin without insert water. Referring to FIG. 7, before mold closing, the third core 103 may be maintained in an elevated state on the first core 101 by the first distance F. For example, because no external force is applied to the guide plate 133 or the support pin 139a, it may be in a non-compressed state. The first gap F formed between the third core 103, for example, the core frame 131a, and the first core 101 is, for example, an insert (e.g., the insert of FIGS. 8 and 9 It may be larger than the tolerance allowed in the production specifications of water 151). In one embodiment, the third core 103, for example, the surface of the core frame 131a (e.g., the surface in contact with the cavity C) has at least one protrusion 135a or at least one groove 135b. This can be formed. The protrusions 135a or grooves 135b formed on the core frame 131a may, for example, have a shape corresponding to the decoration or binding structure of the molded product to be manufactured.

Referring to FIG. 8, before mold closing, the insert 151 may be placed on the first core 101, for example, on the cavity C. The insert 151 may be, for example, a metal part such as a fastening boss, screw, or support plate. In the pre-mold closing state, the third cores 103, for example, the core frames 131a, may remain spaced apart from other adjacent core frames 131a at a specified distance. For example, even if the insert 151 has a size or shape similar to the space provided by the cavity C, it can be easily placed on the cavity C.

Referring to FIG. 9, in a mold-closed state, for example, in a state where the second core 102 and the first core 101 are coupled to face each other, the second core 102 is connected to the insert 151 and/or the third core. (103) can be contacted or pressed. Even in the mold-closed state, the gap between the second core 102 and the first core 101 may vary depending on the size of the insert 151, for example, the thickness (G). According to one embodiment, the gap between the third core 103 (e.g., core frame 131a) and the first core 101 (e.g., the first gap F in FIG. 7) is the insert water 151. may be greater than the manufacturing tolerances allowed. For example, even if the insert 151 has a certain manufacturing tolerance, the third core 103 may be in close contact with the second core 102. In one embodiment, while the second core 102 is in contact with the third core 103, the elastic force accumulated while the support pins 139a(s) and/or the guide plate 133 are compressed is applied to the third core 103. (103) can be maintained in close contact with the second core (102). As a result, the cavity C can be solidly implemented, and the boundary between the

cores

101, 102, and 103 can be substantially sealed.

The cured state after molten resin is injected into the cavity (C) is illustrated in Figure 10. In one embodiment, the injection molded portion 153 is hardened to surround at least a portion of the insert 151, and the generation of parting lines or foreign substances can be suppressed. For example, by maintaining the third core 103 (e.g., the core frame 131a of FIG. 3 or FIG. 4) in close contact with the second core 102, the generation of parting lines or foreign substances can be suppressed. . As a result, post-processing for parting lines or foreign matter removal can be minimized and the cost required to manufacture the insert molded product 105 can be reduced.

FIG. 11 illustrates a state in which the second core 102 moves away from the first core 101 after the injection molded portion is cured. In a state in which the second core 102 moves away from the first core 101, the insert molding 105 may rise together with the third core 103 by a specified distance from the first core 101. Here, the 'designated interval' may be equal to or smaller than the first interval (F). In one embodiment, as the second core 102 moves away from the first core 101, the support pin 139a and/or the guide plate 133 are elastically restored, and the core frame 131a is elastically restored to the first core 101. ), the insert molded product 105 can be raised from the first core 101 while rising from the. According to one embodiment, as the first core 101 rises, the core frames 131a may move away from other adjacent core frames 131a. For example, while rising from the first core 101, the core frames 131a(s) may substantially move in a direction away from the insert molding 105. In one embodiment, the distance by which the core frame 131a rises from the mold-closed state due to the elastic restoring force of the support pin 139a is approximately 2-3 mm, which is the distance between the core frame 131a(s) and the insert molded product 105. Changes may be substantially undetectable to the naked eye.

Referring to FIG. 12, after the core frame 131a and/or the insert molding 105 rises from the first core 101 by the first distance F, the push base 145 moves in the first direction D1. The take-out

pins

141 and 143 can be raised while moving along. As mentioned above, the first take-out pin 141 protrudes onto the cavity C before the second take-out pin 143, thereby allowing the insert molded product 105 to gradually rise. The insert molding 105 may still remain coupled to the core frame 131a until the first take-out pin 141 raises the insert molding 105. The insert molded product 101 and/or the core frame 131a may be further moved away from the first core 101 by the first take-out pin 141, and the core frame 131a may be moved substantially in the second direction (D2). ), it can separate or move away from the insert molding 105. For example, while moving away from the first core 101 in the first direction D1 by the first take-out pin 141, the core frame 131a may be separated by moving away from the insert molding 105. . Accordingly, even if there is a decoration or binding structure formed by the core frame 131a, the insert molding 105 can be easily separated from the core frame 131a.

Referring to FIG. 13, after the insert molding 105 is separated from the core frame 131a, the second take-out pin 143 is placed on the first core 101 (e.g., the first gate groove 113). may protrude. At this time, the second take-out pin 143 may be accelerated by the movement of the push base 145 and the rotation of the rotation block 149. For example, from the point at which the second take-out pin 143 protrudes onto the first core 101, the second take-out pin 143 may rise at a faster rate than the first take-out pin 141 or the core frame 131a. Accordingly, after the insert molded product 105 is first separated from the core frame 131a, the gate material 159 is inserted into the first gate groove 113 and/or the second gate groove 131b by the second extraction pin 143. ) can be removed from.

As described above, the mold (e.g., mold 100 in FIG. 1 or 2) according to the embodiment(s) of the present disclosure implements a cavity (e.g., cavity C in FIG. 4 or FIG. 9). The core (e.g., the third core 103 in FIGS. 1 to 13) is arranged to be movable in the inclined direction (e.g., the second direction D2 in FIG. 1), thereby forming the molded product (e.g., the insert molded product in FIG. 13). Even if curves such as decorations or structures are formed on the surface of 105)), they can be easily separated. In one embodiment, the third core may suppress the generation of parting lines or foreign substances by maintaining a state in close contact with the counterpart core (e.g., the second core in FIG. 1 or FIG. 10) in a mold-closed state. For example, the mold according to the embodiment(s) of the present disclosure can contribute to reducing manufacturing costs in manufacturing injection molded products by providing an environment that can minimize post-processing of insert molded products.

The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. will be.

As described above, according to an embodiment of the present disclosure, a mold for injection molding (e.g., the mold 100 of FIG. 1 or 2) includes a first core (e.g., the first core of FIG. 1 or FIG. 2). (101)), as it moves along a first direction (e.g., the first direction D1 of FIG. 1), it is coupled to the first core to face the cavity (e.g., the cavity of FIG. 4 or 9). C) configured to form at least a portion of a second core (e.g., the second core 102 of FIG. 1 or FIG. 9), disposed on the first core and disposed in a second direction inclined to the first direction (e.g., A plurality of third cores capable of moving in the second direction (D2) of FIG. 1 and configured to surround at least a portion of the cavity when the second core is coupled to face the first core (hereinafter, 'mold-closed state') A core (e.g., the third core 103 in FIGS. 1 to 4), and a plurality of support pins disposed on the first core to support the third core (e.g., the support pins in FIGS. 1 to 3) 139a)) may be included. In one embodiment, in the mold closing state, the support pins may be configured to support a corresponding one of the third cores and bring it into close contact with the second core.

According to one embodiment, the third cores may be configured to move closer to or farther away from another adjacent third core as they move along the second direction.

According to one embodiment, in the mold-closing state, the third cores may be arranged to form a closed curve or polygon in contact with each other around the perimeter of the cavity.

According to one embodiment, the mold as described above is disposed on the first core and includes at least one first ejector pin (e.g., FIG. 1 or the first extraction pin 141 of FIG. 12) may be further included.

According to one embodiment, the mold as described above is disposed on the first core and includes at least one second take-out pin (e.g., FIG. 1 Alternatively, it may further include a second extraction pin 143 in FIG. 12).

According to one embodiment, such a mold is formed at least partially on the first core and has a gate groove (e.g.,

gate grooves

113 and 131b in FIG. 6) connected to the cavity across at least a portion of the third core. ) may further be included. In one embodiment, the second take-out pin may reciprocate along the first direction on the gate groove.

According to one embodiment, the gate groove includes at least one first gate groove (e.g., the first gate groove 113 in FIG. 6) formed in the first core in an area outside the cavity, and the third gate groove (e.g., the first gate groove 113 in FIG. 6). It may include at least one second gate groove (eg, the second gate groove 131b in FIG. 6 or 13) formed in the core and connecting the first gate groove to the cavity. In one embodiment, the second take-out pin may be configured to appear and retract on the first gate groove.

According to one embodiment, the mold as described above includes at least one first ejector pin disposed on the first core and capable of reciprocating movement along the first direction on the cavity, In the off area, at least one first gate groove formed in the first core, at least one second gate groove formed in the third core and connecting the first gate groove to the cavity, and on the first core and may further include at least one second take-out pin disposed to reciprocate along the first direction on the first gate groove. As the second core moves away from the first core from the mold-closed state, the first take-out pin may protrude onto the cavity, and the second take-out pin may protrude onto the first gate groove.

According to one embodiment, the mold as described above includes a push base (e.g., Figure 1, It may further include the push base 145 of FIG. 5 or 6. In one embodiment, the push base may be configured to move the first take-out pin and the second take-out pin along the first direction.

According to one embodiment, the mold as described above is rotatably disposed on the push base, an interference block (e.g., interference block 119 in FIG. 5 or FIG. 6) disposed on the first core, and the second core. It may further include a rotation block (e.g., the rotation block 149 in FIGS. 1, 5, or 6) supported on the take-out pin. In one embodiment, the interference block may be configured to rotate the rotation block as the push base approaches the first core.

According to one embodiment, the second take-out pin may be configured to move along the first direction by movement of the push base and further move along the first direction by rotation of the rotation block. .

According to one embodiment, the third core includes a core frame (e.g., core frame 131a of FIG. 3 or 4) disposed on at least a portion of the circumference of the cavity, and the first core extending from the core frame. It may include a guide plate (eg, guide plate 133 in FIG. 3 or FIG. 4) disposed on the inside and supported by the support pin. According to one embodiment, the guide plate may be arranged along the second direction.

According to one embodiment, the third core may further include a gate groove (eg, the second gate groove 131b in FIG. 3 or FIG. 6) formed across the core frame.

According to one embodiment, as the third cores move along the second direction, the core frames may be configured to move closer to or away from other adjacent core frames.

According to one embodiment, in the mold-closing state, the core frames may be in contact with each other around the cavity and arranged to form a closed curve or polygon.

According to an embodiment of the present disclosure, a mold for injection molding (e.g., mold 100 of FIG. 1 or 2) includes a first core (e.g., first core 101 of FIG. 1 or 2), As it moves along a first direction (e.g., the first direction (D1) of FIG. 1), it is coupled to the first core to face at least one of the cavities (e.g., the cavity (C) of FIG. 4 or FIG. 9). a second core configured to form a portion (e.g., the second core 102 in FIG. 1 or FIG. 9 ), disposed on the first core and in a second direction inclined to the first direction (e.g., the second core 102 in FIG. 1 ); direction (D2)), and a plurality of third cores configured to surround at least a portion of the cavity (e.g., FIG. 1 to 4), and disposed on the first core to support the third core, thereby bringing the corresponding one of the third cores into close contact with the second core in the mold-closed state. It may include a plurality of support pins (eg, support pins 139a in FIGS. 1 to 3) configured to do so. In one embodiment, the third core has at least one protrusion (e.g., protrusion 135a in FIG. 7) or at least one groove (e.g., groove 135b in FIG. 7) formed on a surface surrounding the cavity. may include.

According to one embodiment, the third core includes a core frame (e.g., core frame 131a of FIG. 3 or 4) disposed on at least a portion of the circumference of the cavity, and the first core extending from the core frame. It may include a guide plate (eg, guide plate 133 in FIG. 3 or FIG. 4) disposed on the inside and supported by the support pin. In one embodiment, the guide plate may be arranged along the second direction.

According to one embodiment, the at least one protrusion or the at least one groove may be formed on the surface of the core frame.

Although the present disclosure has been described by way of example with respect to one embodiment, it should be understood that the one embodiment is for illustrative purposes rather than limiting the present invention. It will be apparent to those skilled in the art that various changes may be made in the format and detailed structure of the present disclosure, including the appended claims and their equivalents, without departing from the overall scope of the present disclosure. Although omitted in the detailed description, the mold according to an embodiment of the present disclosure may include elastic members disposed at appropriate positions. The elastic member(s) may provide force to return the respective components to their initial positions. For example, an elastic member may be disposed between the core base and the push base to move the push base in a direction away from the first core after the extraction operation is completed. In one embodiment, when the push base moves away from the first core after the take-out operation is completed, the elastic member disposed inside the push base moves the second take-out pin or Rotation blocks can be moved (or rotated). In the disclosed embodiment, the mold includes an interference block to rotate the rotary block, but the present disclosure is not limited thereto, and a separate drive motor is provided to rotate the rotary block at a designated point in time or a second take-out pin. (143) can be moved directly in the first direction (D1) with respect to the push base (145).

Claims

In the mold 100 for injection molding,

first core 101;

a second core 102 configured to face and couple to the first core as it moves along a first direction D1 to form at least a portion of a cavity C;

It is disposed on the first core and can move in a second direction (D2) inclined to the first direction, and when the second core is coupled to face the first core (hereinafter, 'mold closed state'), the cavity of the cavity a plurality of third cores 103 configured to surround at least a portion thereof; and

It includes a plurality of support pins 139a disposed on the first core and supporting the third core,

In the mold closing state, the support pins are configured to support a corresponding one of the third cores and bring it into close contact with the second core.
The mold of claim 1, wherein the third cores are configured to move closer to or farther away from another adjacent third core as they move along the second direction.
The mold according to any one of claims 1 to 2, wherein, in a mold-closing state, the third cores are in contact with each other around the cavity and are arranged to form a closed curve or a polygon.
The method of any one of claims 1 to 3, wherein at least one first ejector pin is disposed on the first core and is capable of reciprocating movement along the first direction on the cavity ( 141).
The mold according to claim 4, further comprising at least one second take-out pin (143) disposed on the first core and capable of reciprocating movement along the first direction in an area outside the cavity.
6. The method of claim 5, further comprising a gate groove (113, 131b) formed at least partially in the first core and connected to the cavity across at least a portion of the third core,

The second take-out pin reciprocates along the first direction on the gate groove.
The method of claim 6, wherein the gate groove is:

at least one first gate groove 113 formed in the first core in an area outside the cavity; and

At least one second gate groove (131b) formed in the third core and connecting the first gate groove to the cavity,

The second take-out pin is configured to appear and retract on the first gate groove.
According to clause 7,

It further includes a push base (145) on the opposite side from the second core that moves along the first direction toward or away from the first core,

A mold wherein the push base is configured to move the first take-out pin and the second take-out pin along the first direction.
According to clause 8,

an interference block 119 disposed on the first core; and

It further includes a rotation block 149 rotatably disposed on the push base and supported on the second take-out pin,

As the push base approaches the first core, the interference block is configured to rotate the rotation block.
The mold according to claim 9, wherein the second take-out pin moves along the first direction by movement of the push base and further moves along the first direction by rotation of the rotation block.
The method of any one of claims 1 to 10, wherein the third core,

A core frame 131a disposed at least partially around the cavity; and

A guide plate 133 extends from the core frame, is disposed inside the first core, and is supported by the support pin,

The guide plate is a mold disposed along the second direction.
The mold of claim 11, wherein the third core further includes a gate groove formed across the core frame.
The mold according to any one of claims 11 to 12, wherein in a mold closing state, the core frames are in contact with each other around the cavity and are arranged to form a closed curve or polygon.
The mold according to any one of claims 1 to 10, wherein the third core includes at least one protrusion (135a) or at least one groove (135b) formed on a surface surrounding the cavity.
The method of claim 14, wherein the third core is:

A core frame 131a disposed at least partially around the cavity; and

A guide plate 133 extends from the core frame and is disposed along the second direction inside the first core and supported by the support pin,

The at least one protrusion or the at least one groove is a mold formed on the surface of the core frame.