Injection molding apparatus and injection molding method by using the same

Abstract

The present disclosure introduces an injection mold device and an injection molding method using the same, which improve product quality by preventing the skin from melting due to high temperature and pressure by instantaneously reducing pressure during injection molding, and reduce manufacturing costs by simplifying the equipment for reducing pressure during injection.

Description

Technology Field

[0001] The present disclosure relates to an injection molding apparatus for producing a product with minimized skin damage and an injection molding method using the same. Background Technology

[0003] An injection molding machine is a machine that forms a product of a desired shape by applying heat and injecting molten materials, such as thermoplastic or thermosetting plastics or rubber, into a cavity formed between molds.

[0004] Various products are produced through such injection molding, and in the case of vehicles, exterior and interior materials are also applied to molded products made of injection molding materials.

[0005] In particular, insert injection molding is performed to form products containing different materials for vehicle interior components. That is, due to the increasing demand for premium quality, vehicle interior components are increasingly being manufactured in forms where a rigid substrate is finished with a soft skin.

[0006] During the manufacturing process of such vehicle interior materials, high temperature and high pressure are applied to the skin, and the skin may be damaged by these high temperature and high pressure. For example, the skin may deteriorate and harden as it is pressed by the high temperature and high pressure.

[0007] The matters described as background technology above are intended only to enhance understanding of the background of the present disclosure and do not constitute prior art already known to those skilled in the art. The problem to be solved

[0009] The present disclosure aims to provide an injection molding device and an injection molding method using the same, which improve product quality by reducing skin damage during injection molding.

[0010] The technical problems to be solved in this disclosure are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0012] An injection molding device according to the present disclosure for achieving the above objective comprises: a first mold configured to inject resin; and a second mold comprising a fixed core facing the first mold, a sliding core sliding on the fixed core, and an operating unit for controlling the sliding position of the sliding core. When the first mold and the second mold are matched and a fabric is inserted, and the resin is injected and compressed, the operating unit can cause the sliding core to retract from the compression direction to reduce pressure.

[0013] According to one embodiment, a fixed core has a seating groove formed in a direction facing the first mold, and an operating unit is provided on the opposite side of the seating groove. A sliding core is provided to be slidable in the seating groove and is connected to the operating unit so that the sliding position can be adjusted.

[0014] According to one embodiment, the operating unit includes a moving member and a driving member, wherein the moving member is connected to a sliding core and moves together with the sliding core, and the driving member may include a locking part that moves to contact the moving member and a driving part that moves the locking part.

[0015] According to one embodiment, a movable member is provided on one side of a fixed core and a sliding core is provided on the other side of the fixed core, and the movable member and the sliding core can be coupled to each other through a connecting part that moves linearly through the fixed core.

[0016] According to one embodiment, the operating unit further includes an elastic member, and the elastic member is provided between a movable member and a fixed core to provide an elastic force in a direction in which the movable member moves away from the fixed core.

[0017] According to one embodiment, the locking member is movably provided on a fixed core, and the driving member is installed on the fixed core and connected to the locking member to transmit power, thereby allowing the locking member to move in a direction that contacts or separates from the moving member.

[0018] According to one embodiment, the locking members are composed of a plurality of members and are spaced apart along the circumference of the movable member, and can be moved to contract or expand toward the movable member by the power of the driving member.

[0019] According to one embodiment, the driving unit is configured to be connected to a plurality of locking units, and the locking units can be moved over the same distance.

[0020] According to one embodiment, the locking member is provided to be movable in the outer direction of the moving member, and a projection portion on which the moving member is caught may be formed.

[0021] According to one embodiment, the movable member is formed in a plate shape, and the locking part is formed with a multi-stage stepped jaw portion, so that the movable member can be sequentially seated on each jaw portion according to the movement position of the locking part.

[0022] According to one embodiment, the moving member may have a protrusion formed thereon that is supported on one of the steps of the locking member at a position before moving in a direction of detachment from the locking member by the driving member.

[0023] Meanwhile, the injection molding method according to the present disclosure may include the steps of: arranging a first mold and a second mold so as to face each other and inserting a fabric; moving either the first mold or the second mold to an injection position and injecting a resin; depressurizing by controlling a sliding core to move away from the first mold after injection and compression of the resin; and moving the first mold and the second mold after depressurization and cooling to eject a product.

[0024] According to one embodiment, in the step of injecting the resin, a foaming agent may be added to the resin. Effects of the invention

[0026] According to the injection molding device and injection molding method using the same disclosed in the present disclosure, the pressure is instantaneously reduced during injection molding to prevent the skin from melting due to high temperature and pressure, thereby improving the quality of the product.

[0027] In addition, manufacturing costs can be reduced by simplifying the equipment for depressurizing during injection.

[0028] The effects obtainable from the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure belongs from the description below. Brief explanation of the drawing

[0030] FIG. 1 is a drawing showing an injection mold device according to one embodiment of the present disclosure. FIG. 2 is an enlarged view of 'a' of the injection mold device shown in FIG. 1. FIG. 3 Flowchart of an injection molding method according to the present disclosure. FIG. 4 is a drawing showing a fabric inserted between a first mold and a second mold in an injection molding device according to one embodiment of the present disclosure. FIG. 5 is a drawing showing the movement of a second mold and resin injection in an injection molding device according to one embodiment of the present disclosure. FIG. 6 is a drawing showing a compression process in an injection molding device according to one embodiment of the present disclosure. FIG. 7 is a drawing showing pressure reduction through the control of an operating unit in an injection molding device according to one embodiment of the present disclosure. FIG. 8 is a drawing showing the state of the fabric when compressed through the first mold and the second mold. FIG. 9 is a drawing showing the state of the fabric when depressurized through the first mold and the second mold. FIG. 10 is a drawing showing the ejection of a product by moving a second mold in an injection molding device according to one embodiment of the present disclosure. Specific details for implementing the invention

[0031] In describing the embodiments disclosed in this specification, detailed descriptions of related prior art are omitted if it is determined that such detailed descriptions may obscure the essence of the embodiments disclosed in this specification. Furthermore, the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and technical scope of this disclosure. The disclosure below is not intended to limit this disclosure to the described form or specific field, and it is considered that various alternative modes and modifications to this disclosure are possible, whether explicitly stated or implied in this specification. Those skilled in the art will recognize that the form and details of this disclosure may change.

[0032] The present disclosure is described with reference to specific embodiments. However, as understood by those skilled in the art to which the present disclosure pertains, the various embodiments disclosed herein may be modified or otherwise implemented in various other ways without departing from the spirit and scope of the present disclosure. Accordingly, the following description should be considered illustrative and is intended to teach those skilled in the art to the manner in which various embodiments are made and used. It will be understood that the forms of the disclosure shown and described herein are to be taken as representative embodiments. Equivalent elements, or materials, processes, or steps may be substituted for those representatively exemplified and described in the present disclosure. Expressions used in describing the present disclosure, such as "including," "comprising," "incorporating," "consisting of," "have," "is," etc., should be interpreted as allowing items, components, or elements not explicitly described to be indicated in a non-exclusive manner, i.e., to be indicated. In addition, references to the singular should be interpreted as including those related to the plural.

[0033] Furthermore, the various embodiments disclosed herein should be accepted as illustrative and descriptive and should not be interpreted as limiting the content of the disclosure. All references to joining (e.g., attached, affixed, coupled, connected, etc.) are used solely to aid in understanding the disclosure and are not intended to limit the location, orientation, or use of the configuration or the methods disclosed herein. Accordingly, where joining references exist, they should be interpreted broadly. Moreover, in such joining references, it is not assumed that two or more elements are directly connected to each other. Additionally, all numeric terms, e.g., "first," "second," "third," "primary," "secondary," "major," or any other general or numeric terms, are to be taken solely as identifiers to aid in understanding the various components, forms, variations, or modifications of the present disclosure and are not to imply any limitation to any component, form, variation, or modification, or to any order or preference thereof. That is, while such expressions may be used to describe various components, the components are not limited by such expressions. Such expressions are used solely for the purpose of distinguishing one component from another.

[0034] The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably solely for the ease of drafting the specification, and do not inherently possess distinct meanings or roles.

[0035] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0036] Furthermore, the terms "Unit" or "Control Unit" included in the name are merely terms widely used to name controllers that control specific vehicle functions, and do not refer to generic function units.

[0037] Any number of components or various components in any configuration described herein may be included within the disclosure described herein. Components may include any combination of features described herein and may be arranged in any configuration among the various configurations described herein. Concepts regarding the structure and arrangement of the components of the disclosure, as well as their use and operation, may be applied to any number of embodiments in any combination, as well as to specific embodiments discussed herein. Embodiments including those having various features of various arrangements are described below with reference to the drawings.

[0038] Hereinafter, various embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components are given the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted.

[0040] The present disclosure relates to insert injection molding that integrates a hard substrate and a soft skin to produce a single product.

[0041] The hard substrate may include a thermosetting plastic material and may be cured by injection molding with resin (A) in a molten state.

[0042] The skin can be made of non-woven fabric to enable the realization of a leather material and can be inserted into the fabric (B).

[0043] Thus, the product produced by insert injection molding of the resin (A) and the fabric (B) can be, for example, an interior material for a vehicle, and can also be produced in various materials depending on various fields.

[0044] FIG. 1 is a drawing showing an injection mold device according to one embodiment of the present disclosure, and FIG. 2 is an enlarged view of an injection mold device according to one embodiment shown in FIG. 1.

[0045] An injection molding device according to the present disclosure includes a first mold (100) and a second mold (200), wherein the first mold (100) is configured to inject resin (A), and the second mold (200) may include a fixed core (210) facing the first mold (100), a sliding core (220) sliding on the fixed core (210), and an operating unit (230) for controlling the sliding position of the sliding core (220).

[0046] The first mold (100) is configured to allow molten resin (A) to be injected, and an injection device for melting and injecting the resin (A) can be connected.

[0047] The second mold (200) is positioned to face the first mold (100) and can be arranged to be movable toward the first mold (100). At least one driving device, such as a motor device or a hydraulic device, may be connected to move the second mold (200).

[0048] The second mold (200) of the present disclosure may include a fixed core (210), a sliding core (220), and an operating unit (230).

[0049] The fixed core (210) is positioned to face the first mold (100), and the surface facing the first mold (100) is recessed so that the sliding core (220) can be movably provided.

[0050] The sliding core (220) may be configured to move linearly from the fixed core (210) toward the first mold (100). A cavity may be formed in this sliding core (220) into which a fabric (B) can be inserted and a resin (A) can be filled.

[0051] The operating unit (230) is connected to the sliding core (220) and fixes the position of the sliding core (220) or allows the sliding core (220) to move. This operating unit (230) can provide a power source such as a motor, hydraulics, or pneumatics to enable the sliding core (220) to move, and the position of the sliding core (220) can be varied depending on whether the operating unit (230) provides power.

[0052] In the present disclosure, the operating unit (230) fixes the position of the sliding core (220) and causes the sliding core (220) to move away from the first mold (100) to reduce pressure during the injection molding process.

[0053] Through this, the present disclosure allows for the avoidance of deterioration and damage to the fabric (B) caused by pressure, as the operating unit (230) retracts the sliding core (220) from the compression direction during the injection molding of a product, in which the first mold (100) and the second mold (200) are matched and the resin (A) is injected and then compressed, thereby releasing the instantaneous pressure applied to the fabric (B) and the resin (A).

[0054] That is, the fabric (B) may be damaged due to the high temperature and pressure of the molten resin (A) during injection molding. However, by instantaneously removing the pressure applied to the fabric (B) before the fabric (B) deteriorates after the injection of the resin (A), the original foam of the fabric (B) is restored and hardening due to deterioration is prevented, thereby improving the quality of the product.

[0056] The above-described disclosure is explained in detail as follows.

[0057] As illustrated in FIGS. 1 and 2, a fixed core (210) may have a seating groove (211) formed in a direction facing the first mold (100), and an operating unit (230) may be provided on the opposite side of the seating groove (211). The seating groove (211) is formed on the surface of the fixed core (210) facing the first mold (100) and may be formed to match the outer shape of the sliding core (220) and may be recessed. Additionally, the depth of the recess of the seating groove (211) may be formed to be greater than the width of the sliding core (220). The operating unit (230) may be provided on the opposite side of the fixed core (210) where the seating groove (211) is formed, and may be connected to the sliding core (220) by penetrating or bypassing a part of the fixed core (210). In the present disclosure, the operating unit (230) may be connected to the sliding core (220) by penetrating the fixed core (210). In this way, by providing the operating unit (230) in the second mold (200), the installation space for providing the operating unit (230) can be reduced, and the overall size can be reduced.

[0058] The sliding core (220) is inserted into the seating groove (211) and can move linearly along the direction of the indentation of the seating groove (211). This sliding core (220) is connected to an operating unit (230) and can be moved by the operating unit (230) by fixing its position or allowing a change in position.

[0059] Meanwhile, the operating unit (230) may include a moving member (231) and a driving member (232).

[0060] The moving member (231) is connected to the sliding core (220) and can move together with the sliding core (220).

[0061] The driving member (232) may include a locking member (233) and a driving member (234). The locking member (233) is movably provided in the second mold (200) and may selectively come into contact with the moving member (231). The driving member (234) may come into contact with the locking member (233) to adjust the moving position of the locking member (233). Here, the driving member (234) may provide various power sources such as motor power, hydraulic power, and pneumatic power, and may be connected to the locking member (233) in various connection methods such as a rack and pinion method, a piston and cylinder connection method, or a screw connection method to adjust the moving position of the locking member (233).

[0062] Through this, the operating unit (230) can restrict the position of the moving member (231) or allow a change in position of the locking part (233) depending on whether the driving part (234) forming the driving member (232) is operated. When the position of the moving member (231) is fixed by the locking part (233), the sliding core (220) is also fixed in position, thereby maintaining injection and compression together with the second mold (200). When the position of the moving member (231) is allowed to change from the locking part (233), the sliding core (220) can retract in a direction away from the second mold (200) to momentarily release the pressure.

[0063] To explain in detail the operating unit (230) according to the present disclosure, a moving member (231) is provided on one side of a fixed core (210), and a sliding core (220) is provided on the other side of a fixed core (210). The moving member (231) and the sliding core (220) can be connected to each other through a connecting part (231a) that moves linearly through the fixed core (210).

[0064] That is, based on the fixed core (210), the movable member (231) is provided on one side of the fixed core (210) and the sliding core (220) is provided on the other side of the fixed core (210). The movable member (231) and the sliding core (220) are connected via a connecting part (231a) that extends straight through the fixed core (210), thereby allowing the movable member (231) and the sliding core (220) to move in a straight line together. The connecting part (231a) may be formed with a bolt and fastened to the movable member (231) and the sliding core (220), and may be manufactured integrally with the movable member (231) or the sliding core (220) or joined through welding. Additionally, a hole may be formed in the fixed core (210) to allow the connecting part (231a) to pass through, and multiple connecting parts (231a) may be provided considering the required rigidity, injection pressure, etc. of the moving member (231) and the sliding core (220).

[0065] Meanwhile, the operating unit (230) may further include an elastic member (235). The elastic member (235) may be composed of a return spring, and various other elements that provide a pulling force or a pushing force may be applied.

[0066] In the present disclosure, the elastic member (235) may be provided between the movable member (231) and the fixed core (210), and by providing an elastic force in the direction in which the movable member (231) moves away from the fixed core (210), the sliding core (220) may be moved together with the movable member (231) in the direction away from the first mold (100).

[0067] Through this, when the moving member (231) is allowed to change position from the locking part (233), the moving member (231) is moved by the elastic force of the elastic member (235), so that the sliding core (220) retracts together with the moving member (231) in a direction away from the first mold (100), thereby allowing the pressure to be instantaneously released during injection compression. In this way, as the sliding core (220) retracts instantaneously with the moving member (231) by the elastic member (235), the pressure acting on the fabric (B) is released, thereby restoring the foam and improving the quality of the product.

[0068] Meanwhile, the locking part (233) may be configured to move in a direction toward the movable member (231) or away from the movable member (231) from the fixed core (210). A guide structure for the movement of the locking part (233) or a rail structure may be applied to the fixed core (210), and various structures may be applied to enable the locking part (233) to move along a predetermined path.

[0069] The driving unit (234) may be installed in the fixed core (210) and connected to the locking unit (233). This driving unit (234) may generate power to cause the locking unit (233) to move toward the moving member (231) or to move in a direction that separates it from the locking unit (233). In this disclosure, the driving unit (234) is depicted as being embedded in the second mold (200), but it may also be installed outside the second mold (200).

[0070] In detail, the locking portion (233) may be configured to be divided into multiple parts, and each part may be spaced apart along the outer perimeter of the movable member (231). Accordingly, the multiple locking portions (233) may be moved toward the movable member (231) by the power of the driving portion (234) to restrain the movable member (231), or moved to spread apart to release the restraint of the movable member (231). In this way, as the locking portion (233) is divided into multiple parts and contacts the movable member (231) in a manner that surrounds it, the movable member (231) can make balanced contact with the locking portion (233), and the force acting on the movable member (231) is distributed in a balanced manner, thereby preventing damage to each part and allowing the sliding core (220) to maintain pressure smoothly.

[0071] To this end, the driving unit (234) is provided to be connected to each of the multiple locking units (233), and the locking units (233) can be moved over the same distance. For example, the driving unit (234) may be applied as a single unit and connected to each locking unit (233) via a link, or multiple driving units (234) may be individually connected to each locking unit (233). In the present disclosure, a driving unit (234) may be connected to each locking unit (233), and each driving unit (234) may be configured to provide the same driving force. As a result, the multiple locking units (233) can move over the same distance, thereby supporting the moving member (231) in a balanced manner, and can be disengaged from the moving member (231) at the same timing, thereby preventing damage to the moving member (231).

[0072] Meanwhile, the locking portion (233) is configured to be movable in the outer direction of the movable member (231), and a jaw portion (233a) on which the movable member (231) is caught may be formed.

[0073] The jaw portion (233a) may be formed in the portion facing the first mold (100) from the locking portion (233), and when the movable member (231) moves outward while the locking portion (233) is engaged with the jaw portion (233a) of the movable member (231), the locking portion (233) may detach from the jaw portion (233a), thereby allowing the movable member (231) to move. In this way, when the movable member (231) comes into contact with the locking portion (233), the movable member (213) is seated on the jaw portion (233a), thereby allowing the locking portion (233) to stably support the movable member (231).

[0074] In the present disclosure, the locking portion (233) is formed such that the jaw portion (233a) is stepped in multiple stages, so that the moving member (231) can be sequentially seated on each jaw portion (233a) according to the moving position of the locking portion (233).

[0075] Here, the movable member (231) can be formed in a plate shape so as to be seated on each jaw portion (233a) of the locking portion (233).

[0076] In the present disclosure, the jaw portion (233a) of the locking portion (233) forms three steps as shown in FIG. 2, and the number of steps of the jaw portion (233a) can be set in various ways.

[0077] Thus, the locking part (233) is formed with a multi-stage jaw portion (233a), thereby preventing malfunctions caused by injection pressure during the injection process and ensuring a normal operating range. That is, when the locking part (233) maintains its initial position by the driving part (234) and injection pressure is applied to the sliding core (220), if the moving member (231) is pushed in a retracting direction together with the sliding core (220), the molding quality may be degraded. However, by forming the jaw portion (233a) of the locking part (233) in multiple stages, the pushing of the moving member (231) by the injection pressure is restricted, and the deterioration of molding quality due to excessive pressure release can be prevented.

[0078] In this way, the locking part (233) has a plurality of stepped jaws (233a) formed therein, so that when the locking part (233) moves in a direction to release the restraint of the moving member (231) by the driving part (234), the moving member (231) is released from the locking part (233) step by step, thereby securing a pressure reduction effect and ensuring the molding quality of the product.

[0079] Here, the moving member (231) may have a protrusion (231b) formed that is supported on one of the steps of the locking member (233) at a position before moving in a direction of detachment from the locking member (233) by the driving member (234).

[0080] Thus, a protrusion (231b) is formed on the movable member (231), and the protrusion (231b) may come into contact with one of the steps of the locking member (233). For example, when the sliding core (220) advances toward the first mold (100) and its position is fixed by the locking member (233), the protrusion (231b) of the movable member (231) may be formed to come into contact with the part with the smallest diameter between the jaws (233a) of each locking member (233) among the plurality of steps of the locking member (233).

[0081] As a result, during the injection molding process through the first mold (100) and the second mold (200), the moving member (231) being pushed by the injection pressure is restricted by the locking part (233), so that a constant pressure can be maintained during the injection and compression process.

[0083] The injection mold method according to the present disclosure described above may include, in accordance with the flowchart illustrated in FIG. 3, a step (S10) of arranging a first mold (100) and a second mold (200) so as to face each other and inserting a fabric (B); a step (S20) of moving either the first mold (100) or the second mold (200) to an injection position and injecting a resin (A); a step (S30) of depressurizing by causing a sliding core (220) to retract away from the first mold (100) through the control of an operating unit (230) after injection and compression of the resin (A); and a step (S40) of moving the first mold (100) and the second mold (200) to eject a product after depressurization and cooling.

[0084] That is, as shown in FIG. 4, the first mold (100) and the second mold (200) are arranged to face each other, and the fabric (B) is inserted into the second mold (200). At this time, the operating unit (230) can be fixed in position with the sliding core (220) moved toward the first mold (100).

[0085] Subsequently, as illustrated in FIG. 5, the second mold (200) is moved toward the first mold (100) and positioned for injection. Additionally, molten resin (A) is injected from the first mold (100). Here, a foaming agent may be added to the resin (A) to form a foam layer, thereby reducing the weight of the injection-molded product. The mold opening distance according to the injection positions of the first mold (100) and the second mold (200), as well as the injection pressure, temperature, speed, etc. of the resin (A), can be determined according to the product design.

[0086] As illustrated in FIG. 6, when the molten resin (A) from the first mold (100) is foamed, the injected resin (A) is compressed until the mold opening distance becomes the target distance. As a result, the resin (A) can be filled into the fabric (B) between the first mold (100) and the second mold (200) and become integrated.

[0087] Thus, when compression is completed, the operating unit (230) is controlled to cause the sliding core (220) to retract from the compression direction, as shown in FIG. 7. As a result, the pressure applied to the fabric (B) and the resin (A) is instantaneously released, allowing the fabric (B) to be restored and thus improving product quality. That is, as can be seen in FIG. 8, during the compression process through the first mold (100) and the second mold (200), the fabric (B) is compressed by injection pressure. However, as shown in FIG. 9, the foam of the fabric (B) is restored through the depressurization process, thereby maintaining the material properties of the fabric (B) and ultimately improving product quality.

[0088] Afterwards, as shown in FIG. 10, if the second mold (200) is moved to be separated from the first mold (100), the inner space is opened and the product can be ejected.

[0090] According to the injection molding device and injection molding method using the same disclosed in the present disclosure, the pressure is instantaneously reduced during injection molding to prevent the skin from melting due to high temperature and pressure, thereby improving the quality of the product.

[0091] In addition, manufacturing costs can be reduced by simplifying the equipment for depressurizing during injection.

[0093] Although specific embodiments of the present disclosure have been illustrated and described, it is obvious to those skilled in the art that the present disclosure may be modified and changed in various ways without departing from the technical spirit of the present disclosure as provided by the following claims. Explanation of the symbols

[0095] 100: 1st mold 200: 2nd mold 210: Fixed core 211: Seating groove 220: Sliding core 230: Actuating unit 231: Movable member 231a: Connecting part 231b: Protrusion 232: Driving member 233: Locking part 233a: Jaw part 234: Driving unit 235: Elastic member A: Resin B: Fabric

Claims

Claim 1 An injection molding device comprising: a first mold configured to inject resin; a second mold including a fixed core facing the first mold, a sliding core sliding on the fixed core, and an operating unit for adjusting the sliding position of the sliding core; wherein, when the first mold and the second mold are matched and a fabric is inserted, the resin is injected and compressed, and the operating unit causes the sliding core to retract from the compression direction to reduce pressure. Claim 2 An injection molding device according to claim 1, wherein the fixed core has a seating groove formed in a direction facing the first mold, the operating unit is provided on the opposite side of the seating groove, and the sliding core is provided to be slidably in the seating groove and connected to the operating unit so as to adjust the sliding position. Claim 3 An injection molding device according to claim 1, wherein the operating unit comprises a moving member and a driving member, wherein the moving member is connected to the sliding core and moves together with the sliding core, and the driving member comprises a locking part that moves to contact the moving member and a driving part that moves the locking part. Claim 4 An injection molding device according to claim 3, wherein the movable member is provided on one side of the fixed core and the sliding core is provided on the other side of the fixed core, and the movable member and the sliding core are coupled to each other through a connecting part that moves linearly through the fixed core. Claim 5 An injection molding device according to claim 3, wherein the operating unit further comprises an elastic member, and the elastic member is provided between the movable member and the fixed core to provide an elastic force in a direction in which the movable member moves away from the fixed core. Claim 6 An injection mold device according to claim 3, wherein the locking part is movably provided on the fixed core, and the driving part is installed on the fixed core and connected to the locking part to transmit power so as to move the locking part in a direction in which it contacts or separates from the moving member. Claim 7 An injection molding device according to claim 6, wherein the locking portion is composed of a plurality of portions and spaced apart along the circumference of the movable member, and moves to contract or expand toward the movable member by the power of the driving portion. Claim 8 An injection mold device according to claim 7, wherein the driving unit is configured to be connected to each of the plurality of locking units, and the locking units are configured to move by the same distance. Claim 9 An injection molding device according to claim 3, wherein the locking portion is provided to be movable in the outer direction of the movable member and a projection portion is formed on which the movable member catches. Claim 10 An injection molding device according to claim 9, wherein the moving member is formed in a plate shape and the locking part is formed such that the jaw part is stepped in multiple stages, so that the moving member is sequentially seated on each of the jaw parts according to the moving position of the locking part. Claim 11 An injection mold device according to claim 10, wherein the moving member has a protrusion formed thereon that is supported on one of the steps of the locking part at a position before moving in a direction of detachment from the locking part by the driving part. Claim 12 An injection molding method according to claim 1, comprising: a step of arranging the first mold and the second mold so as to face each other and inserting a material; a step of moving either the first mold or the second mold to an injection position and injecting a resin; a step of depressurizing by controlling the sliding core to move away from the first mold after injection and compression of the resin through the control of the operating unit; and a step of ejecting a product by moving the first mold and the second mold after depressurization and cooling. Claim 13 In claim 12, an injection molding method wherein, in the step of injecting a resin, a foaming agent is added to the resin.

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