WO2024096297A1

WO2024096297A1 - Manufacturing method and injection mold for diaphragm

Info

Publication number: WO2024096297A1
Application number: PCT/KR2023/013483
Authority: WO
Inventors: 양예호; 최황오; 강준배; 김성훈; 김지윤; 김태균; 문병오; 이규철
Original assignee: 삼성전자주식회사
Priority date: 2022-11-04
Filing date: 2023-09-08
Publication date: 2024-05-10
Also published as: KR20240064453A

Abstract

This injection mold for forming a diaphragm includes a core module provided to form a first side of the diaphragm and a middle core module which is provided to face the first core module and forms a second side opposite to the first side of the diaphragm, wherein the middle core module includes a middle core arranged to face the core module and an extension slide movably mounted on the middle core to form an undercut of the diaphragm, the extension slide moving along the radial direction of the diaphragm to extend the edge of the diaphragm in the radial direction beyond the radius.

Description

Diaphragm manufacturing method and injection mold

This disclosure relates to an injection mold for manufacturing a diaphragm used in a washing machine and a manufacturing method thereof.

A washing machine is a machine that uses electricity to process laundry, such as clothes and bedding. A washing machine includes a cabinet with an opening, a tub installed in the cabinet, and a drum rotatably installed in the tub. Additionally, the washing machine includes a door for opening and closing the opening of the cabinet. A washing machine holds laundry inside a drum and supplies water and detergent into the drum. Rotate the drum to remove contamination from the received laundry.

Additionally, the washing machine includes a diaphragm to prevent water supplied to the drum through between the drum and the door from leaking into the cabinet. The diaphragm can minimize the transmission of tub vibration to the cabinet. These diaphragms can be molded through injection molds.

When the molded diaphragm is removed from the injection mold, the diaphragm may be torn or damaged. Additionally, there is a need to improve the productivity of the diaphragm.

One aspect of the disclosed invention can provide an injection mold with an improved structure to facilitate diaphragm extraction.

Another aspect of the disclosed invention may provide an improved diaphragm manufacturing method so that diaphragm productivity can be improved.

An injection mold for molding a diaphragm according to an embodiment of the disclosed invention may include a core module provided to form the first surface of the diaphragm. The injection mold may include a middle core module that is provided to face the first core module and forms a second side opposite to the first side of the diaphragm.

The middle core module may include a middle core disposed to face the core module. The middle core module is an expansion slide that is movably mounted on the middle core to form an undercut of the diaphragm, and moves along the radial direction of the diaphragm to expand the edge of the diaphragm outward in the radial direction. Can include extended slides.

The expansion slides are provided in plurality, and as the plurality of expansion slides move in the radial direction of the diaphragm, a gap may be formed between the plurality of expansion slides so that the robot can extract the diaphragm.

The core module is a first core module, and may further include a second core module located on the opposite side of the first core module with respect to the middle core module.

The middle core includes a first middle core facing the first core module, a second middle core arranged to be perpendicular to the first middle core, a third middle core facing the second core module, and the first middle core. and a fourth middle core disposed orthogonal to the third middle core.

The first middle core, the second middle core, the third middle core, and the fourth middle core may be arranged orthogonally to each other and have the same shape.

A diaphragm may be injected between the first middle core and the first core module, and at the same time, a diaphragm may be injected between the third middle core and the second core module.

As the middle core module rotates 90 degrees, the diaphragm created between the first middle core and the first core module and the diaphragm created between the third middle core and the second core module are exposed to the outside. They can be cooled by exposure to and each taken out by a robot.

As the middle core module rotates 90 degrees and the first core module, the middle core module, and the second core module are closed, a diaphragm is injected between the first core module and the second middle core, At the same time, a diaphragm may be injected between the second core module and the fourth middle core.

The diaphragm may include a flange portion connected to the undercut and extending along a moving direction of the expansion slide.

The expansion slide may include a first expansion slide that forms a first undercut that is outside the undercut together with the core module, and a second expansion slide that forms a second undercut that is inside the undercut together with the first expansion slide. You can.

The first extension slide may first move a predetermined distance in the radial direction, and then the second extension slide may move in the radial direction.

The middle core module is provided as a heat runner and may include a plurality of injection nozzles extending from the middle core module toward the core module.

The core module is a first core module, the injection mold further includes a second core module positioned opposite to the middle core module, and the diaphragm is located between the first core module and the second core module. Molding material flows in from both sides toward the middle core module from each of the outer sides, and molding material flows out from the middle core module through the plurality of injection nozzles to form the inner surface, thereby allowing rear injection.

The diaphragm may be rearwardly injected by having molding material flow in from one side of the core module toward the middle core module, and molding material flowing out from the middle core module through the plurality of injection nozzles to form an inner surface.

The expansion slides may be provided in four pieces to move in the up, down, left, and right directions, respectively.

The method of manufacturing a diaphragm involves forming a molding material into a cavity formed by a first core module and a middle core module, and a second core module and the middle core disposed in a position opposite to the first core module with respect to the middle core module. A plurality of diaphragms are injection-molded by being respectively injected into cavities formed by modules, and the middle core module and the second core module are each oriented away from the first core module so that the front surfaces of the plurality of diaphragms are exposed. A plurality of expansion slides that move, rotate the middle core module 90 degrees so that the plurality of diaphragms are disposed between the first core module and the second core module, and each form an undercut of the plurality of diaphragms. It may include moving along a radial direction of the diaphragm to spread the edges of the plurality of diaphragms.

The method of manufacturing the diaphragm may include inserting a robot into a gap formed between the plurality of expansion slides as the plurality of expansion slides move to extract the diaphragm from the injection mold.

The method of manufacturing the diaphragm is such that immediately after rotation of the middle core module, the first core module, the middle core module, and the second core module are closed again, between one surface of the first core module and the middle core module. It may include injecting a diaphragm in and simultaneously injecting a diaphragm between the other side of the second core module and the middle core module, which is opposite to the one side.

The middle core module includes a plurality of injection nozzles through which molding material injected from gates formed on both sides of the first core module and the second core module is sprayed, and the diaphragm is formed by the plurality of injection nozzles. Can be rear injection.

The middle core module includes a first middle core facing the first core module, a second middle core arranged to be perpendicular to the first middle core, a third middle core facing the second core module, and the first middle core. A method of manufacturing the diaphragm includes a core and a fourth middle core disposed orthogonal to the third middle core, while the diaphragm is injected from the first middle core and the third middle core, respectively. and the diaphragm formed in the fourth middle core may be taken out, respectively.

Using the extension slide, the diaphragm can be taken out after sufficient cooling of the diaphragm.

Since the diaphragm can be molded using the four sides of the injection mold and the already molded diaphragm can be taken out, cycle time can be improved.

In an injection mold using four sides, by providing a heat runner in the middle core module, the diaphragm can be molded using a rear injection method, thereby improving the aesthetics of the front of the diaphragm exposed to consumers.

1 is a perspective view of an injection mold for a diaphragm according to an embodiment of the disclosed invention.

FIG. 2 is a cross-sectional view taken along line A-A' in FIG. 1.

FIG. 3 is a diagram showing a nozzle frame and an injection nozzle in the injection mold for the diaphragm shown in FIG. 1.

Figure 4 is a front view showing an injection mold for a diaphragm according to an embodiment of the disclosed invention from the front.

FIG. 5 is a diagram illustrating a state in which the middle core module and the second core module are separated from the first core module in the injection mold for the diaphragm shown in FIG. 4.

FIG. 6 is a diagram showing a state in which the middle core module is rotated 90 degrees in the diaphragm injection mold shown in FIG. 5.

FIG. 7 is a diagram showing a state in which the expansion slide moves in the radial direction in the diaphragm injection mold shown in FIG. 6.

Figure 8 is a diagram showing a state before the expansion slide moves in the diaphragm injection mold according to an embodiment of the disclosed invention.

FIG. 9 is a diagram showing a state in which the first expansion slide moves in the injection mold for the diaphragm shown in FIG. 8.

FIG. 10 is a diagram showing a state in which the second expansion slide moves together with the first expansion slide in the injection mold for the diaphragm shown in FIG. 9.

FIG. 11 is a diagram illustrating a nozzle frame and an injection nozzle in a diaphragm injection mold according to an embodiment of the disclosed invention.

The embodiments described in this specification and the configurations shown in the drawings are only preferred examples of the disclosed invention, and at the time of filing this application, there may be various modifications that can replace the embodiments and drawings in this specification.

In addition, the same reference numbers or symbols shown in each drawing of this specification indicate parts or components that perform substantially the same function.

Additionally, the terms used herein are used to describe embodiments and are not intended to limit and/or limit the disclosed invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. The existence or addition of numbers, steps, operations, components, parts, or combinations thereof is not excluded in advance.

In addition, terms including ordinal numbers such as “first”, “second”, etc. used in this specification may be used to describe various components, but the components are not limited by the terms, and the terms It is used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component without departing from the scope of the present invention, and similarly, the second component may also be named a first component. The term “and/or” includes any of a plurality of related stated items or a combination of a plurality of related stated items.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

1 is a perspective view of an injection mold for a diaphragm according to an embodiment of the disclosed invention. FIG. 2 is a cross-sectional view taken along line A-A' in FIG. 1.

As shown in FIGS. 1 and 2, the injection mold 100 of the diaphragm 10 may include a core module and a middle core module 130.

The core module may be provided to form the first surface of the diaphragm 10. The middle core module 130 is provided to face the core module and may form a second side opposite to the first side of the diaphragm 10. Here, the first surface of the diaphragm 10 may be defined as the outer surface of the diaphragm 10. The second surface of the diaphragm 10 may be defined as the inner surface of the diaphragm 10.

In other words, the first surface of the diaphragm 10 may be defined as the front surface of the diaphragm 10. The second surface of the diaphragm 10 may be defined as the rear surface of the diaphragm 10.

When the diaphragm 10 is installed in a washing machine, the portion exposed to the user may be the first side of the diaphragm 10. That is, the first surface of the diaphragm 10 may be provided as a visible part and the second surface of the diaphragm 10 may be provided as an invisible part.

The core module may include a first core module 110 and a second core module 120. The second core module 120 may be located on the opposite side of the first core module 110 with respect to the middle core module 130.

In other words, the middle core module 130 is disposed between the first core module 110 and the second core module 120 to form a cavity that creates the diaphragm 10 together with the first core module 110. A cavity that creates the diaphragm 10 together with the second core module 120 may be formed on the other side opposite to one side. That is, the middle core module 130 of the injection mold 100 according to an embodiment of the disclosed invention can simultaneously mold the diaphragm 10 by utilizing both sides.

The middle core module 130 may include a middle core 134. The middle core 134 may be arranged to face the first core module 110 and the second core module 120.

The middle core can be provided in plural numbers. The plurality of middle cores 134 may include a first middle core 1341, a second middle core 1342, a third middle core 1343, and a fourth middle core 1344.

According to FIGS. 1 and 2 , the first middle core 1341 and the first core module 110 of the middle core module 130 may be arranged to face each other. The third middle core 1343 and the second core module 120 of the middle core module 130 may be arranged to face each other.

The second middle core 1342 may be arranged to be perpendicular to the first middle core 1341. The second middle core 1342 may be arranged to be perpendicular to the third middle core 1343 at the same time.

The fourth middle core 1344 may be arranged to be perpendicular to the first middle core 1341. The fourth middle core 1344 may be arranged to be perpendicular to the third middle core 1343 at the same time.

The second middle core 1342 and the fourth middle core 1344 may be arranged parallel to each other in opposite positions.

The first middle core 1341, the second middle core 1342, the third middle core 1343, and the fourth middle core 1344 may be arranged orthogonally to each other and have the same shape. A diaphragm 10 may be formed in each middle core. The plurality of middle cores 134 shown in FIGS. 1 and 2 are each provided to form two diaphragm 10 molding cavities, but the number is not limited thereto.

Therefore, the diaphragm 10 is injected between the first middle core 1341 and the first core module 110, and at the same time, the diaphragm 10 is injected between the third middle core 1343 and the second core module 120. (10) can be injected.

The middle core module 130 may include a rotation support 133 formed at the top.

The middle core module 130 may be coupled to the mold manipulation machine through the rotation support 133 so as to be rotatable between the first core module 110 and the second core module 120. Through this, rotation of the middle core module 130 can be implemented. However, the rotation method of the middle core module 130 is not limited to this.

The middle core module 130 may include expansion slides 135 and 136.

The expansion slides 135 and 136 may be movably mounted on the middle core 134 of the middle core module 130 to form an undercut of the diaphragm 10. The expansion slide can move along the radial direction of the diaphragm (10).

The expansion slides 135 and 136 may move in a direction parallel to the middle core 134. The expansion slides 135 and 136 may be provided to expand the edge of the diaphragm 10 outward in the radial direction.

The expansion slides 135 and 136 may be provided in plural numbers. For example, in forming one diaphragm 10, four expansion slides 135 can be used as shown in FIGS. 1 and 2. The plurality of expansion slides 135 and 136 corresponding to one diaphragm 10 may each move outward in the radial direction of the diaphragm 10. A gap is formed between the plurality of expansion slides 135 and 136, and the robot can extract the diaphragm 10 through the gap. Detailed information regarding this will be described later.

The first core module 110 may include a first front core 111, a first inner core 112, and a first rear core 113.

The first front core 111 may be arranged to face the middle core 134 of the middle core module 130. In the state shown in FIGS. 1 and 2, the first front core 111 may be arranged to face the second middle core 1342 of the middle core module 130. The first front core 111 may form a cavity in which the diaphragm 10 is molded together with the middle core module 130.

For example, the first front core 111 is formed by forming the diaphragm 10 together with the first extension slide 135, the second extension slide 136, and the body core 138 of the middle core module 130. A cavity can be formed.

The first rear core 113 may be disposed outside the first front core 111. The first inner core 112 may be disposed between the first front core 111 and the first rear core 113. The first front core 111, the first inner core 112, and the first rear core 113 may be coupled to each other.

The second core module 120 may include a second front core 121, a second inner core 122, and a second rear core 123.

The second front core 121 may be arranged to face the middle core 134 of the middle core module 130. In the state shown in FIGS. 1 and 2, the second front core 121 may be arranged to face the fourth middle core 1344 of the middle core module 130. The second front core 121 may form a cavity in which the diaphragm 10 is molded together with the middle core module 130.

For example, the second front core 121 is formed by forming the diaphragm 10 together with the first extension slide 135, the second extension slide 136, and the body core 138 of the middle core module 130. A cavity can be formed.

The second rear core 123 may be disposed outside the second front core 121. The second inner core 122 may be disposed between the second front core 121 and the second rear core 123. The second front core 121, the second inner core 122, and the second rear core 123 may be coupled to each other. As will be described later, the second core module 120 may be provided to be movable relative to the first core module 110. Accordingly, the second front core 121, the second inner core 122, and the second rear core 123 can operate as one body.

Referring to FIGS. 2 and 3 , the injection mold 100 may include a plurality of injection nozzles 132 . A plurality of injection nozzles 132 may be fixed to the nozzle frame 131.

The middle core module 130 of the injection mold 100 may be provided as a heat runner. A plurality of injection nozzles 132 may extend from the middle core module 130 toward the core module.

In the state of FIG. 2, the plurality of injection nozzles 132 extend from the second middle core 1342 toward the first core module 110 and from the fourth middle core 1344 toward the second core module 120. It may be extended.

The injection mold 100 may include a gate 137 through which molding material is injected. The gate 137 according to an embodiment of the disclosed invention may be provided so that the molding material for molding the diaphragm 10 is injected from both sides toward the middle core module 130. Although not shown in FIG. 3, gates 137 may be provided on each of the four sides of the nozzle frame 131.

For example, the diaphragm 10 molded by the injection mold 100 according to an embodiment of the disclosed invention is a middle core module ( Molding material flows in from both sides toward 130 and flows out from the middle core module 130 through a plurality of injection nozzles 132 to form the inner surface of the diaphragm 10, thereby allowing rear injection.

Accordingly, the diaphragm 10 can be molded by injecting molding material into parts that are not exposed to consumers, thereby improving the aesthetics of the diaphragm 10.

As shown in FIG. 3, three injection nozzles 132 may be arranged in a triangular shape to form one diaphragm 10. However, the number of injection nozzles 132 is not limited to this and may be modified in various ways.

Figure 4 is a front view showing the injection mold of the diaphragm 10 according to an embodiment of the disclosed invention from the front. FIG. 5 is a diagram illustrating a state in which the middle core module and the second core module are separated from the first core module in the injection mold of the diaphragm 10 shown in FIG. 4. FIG. 6 is a diagram showing a state in which the middle core module is rotated 90 degrees in the injection mold for the diaphragm 10 shown in FIG. 5. FIG. 7 is a diagram showing a state in which the expansion slide moves in the radial direction in the injection mold for the diaphragm 10 shown in FIG. 6.

With reference to FIGS. 4 to 7 , a process in which the injection mold 100 molds the diaphragm 10 and takes out the diaphragm 10 according to an embodiment of the disclosed invention will be described. For convenience of explanation, the diaphragm 10 is omitted.

As shown in FIG. 4, the first core module 110, the middle core module 130, and the second core module 120 may be arranged to contact each other. This can be referred to as the closed state of the injection mold 100.

In a closed state of the injection mold 100, molding material may be injected into the middle core module 130 from the outside of the injection mold 100 through the gate 137 shown in FIGS. 2 and 3. The high-temperature molding material injected into the middle core module 130 flows inside the middle core module 130 and is injected toward the first core module 110 through a plurality of injection nozzles 132, and the second core module It may be sprayed toward (120).

Accordingly, a plurality of diaphragms 10 may be injected from the cavity formed between the middle core module 130 and the first core module 110. At the same time, a plurality of diaphragms 10 may be injected from the cavity formed between the middle core module 130 and the second core module 120.

In other words, the molding material is disposed in a position opposite to the first core module 110 based on the cavity formed by the first core module 110 and the middle core module 130 and the middle core module 130. A plurality of diaphragms 10 can be injection molded by being respectively injected into the cavities formed by the two core modules 120 and the middle core module 130. In the disclosed invention, a total of four diaphragms 10 are injection molded simultaneously, but the number of diaphragms 10 may be modified without limitation.

Based on the state shown in FIG. 4, a plurality of diaphragms 10 can be injected between the second middle core 1342 and the first core module 110, and the fourth middle core 1344 and the second core A plurality of diaphragms 10 may be injected between modules 120. At this time, the first middle core 1341 is disposed between the first core module 110 and the second core module 120 and is exposed to the outside. The first middle core 1341 may include a first surface (S1). Accordingly, the first surface S1 is exposed to the outside.

In addition, although not shown, the third middle core 1343 is disposed in a position 180 degrees opposite to the first middle core 1341, and the third middle core 1343 is connected to the first core module 110 and the second core. It may be placed between modules 120.

Thereafter, as shown in FIG. 5 , a plurality of diaphragms 10 molded on one side of the second middle core 1342 and the fourth middle core 1344 may be exposed to the outside. For example, the middle core module 130 and the second core module 120 may each move in a direction away from the first core module 110 so that the front surfaces of the plurality of diaphragms 10 are exposed. Based on the direction shown in FIG. 5, the middle core module 130 and the second core module 120 may each move to the left with respect to the first core module 110. This can be referred to as an open state of the injection mold 100.

Through this, the plurality of diaphragms 10 can be cooled by coming into contact with external air.

The first core module 110 may be fixed, and the second core module 120 and the middle core module 130 may be provided to be movable relative to the first core module 110.

Thereafter, as shown in FIG. 6, the middle core module 130 can be rotated 90 degrees. For example, the middle core module 130 includes a plurality of diaphragms 10 generated between the second middle core 1342 and the first core module 110, the fourth middle core 1344, and the second core module. The plurality of diaphragms 10 generated between 120 are disposed between the first core module 110 and the second core module 120 and can be rotated by 90 degrees to be exposed to the outside.

The second middle core 1342 may include a second surface S2. Accordingly, the second surface S2 is exposed to the outside.

Therefore, the plurality of diaphragms 10 created in the state of FIG. 4 can be cooled primarily in the process of opening the mold as shown in FIG. 5, and in the process of rotating the mold as shown in FIG. 6. It can be cooled twice.

Additionally, after the middle core module 130 rotates 90 degrees, the first core module 110, the middle core module 130, and the second core module 120 may return to the closed state.

At the same time, the diaphragm 10 is injected between one side of the first core module 110 and the middle core module 130, and at the same time, the middle core module 130 opposite to the second core module 120 and one side ) The diaphragm 10 can be injected between different sides of the.

For example, the diaphragm 10 formed from the second middle core 1342 and the fourth middle core 1344 is formed between the first middle core 1341 and the first core module 110. While the diaphragm 10 is molded and molded between the third middle core 1343 and the second core module 120, it is cooled for a sufficient time and can be taken out by a robot. The extraction process will be explained in Figure 7.

As shown in FIG. 7, the plurality of expansion slides can move along the radial direction of the diaphragm 10. Accordingly, the edges of the plurality of diaphragms 10 may be expanded.

The middle core module 130 may include a body core 138. The diaphragm 10 may be molded into a ring shape along the outside of the body core 138. The expansion slide may move radially outward of the body core 138 with respect to the body core 138.

The plurality of expansion slides may include a first expansion slide 135. The first extension slide 135 may include an upper extension slide 1351, a right extension slide 1352, a lower extension slide 1353, and a left extension slide 1354. That is, four first extension slides 135 may be provided to move in the up, down, left, and right directions, respectively.

However, the number of expansion slides is not limited to this. For example, the first expansion slide 135 may be provided in three pieces, each with its center having an angle of 120 degrees.

Based on the states of FIGS. 6 and 7, the injection mold 100 rotates so that the diaphragm 10 molded in the second middle core 1342 is exposed to the outside, and then moves the expansion slide to form a plurality of diaphragms. The border portion of (10) may be expanded.

By expanding the edge portions of the plurality of diaphragms 10, pressure can be distributed when the robot applies force to the diaphragm 10 to extract the diaphragm 10. Additionally, by expanding the edge portions of the plurality of diaphragms 10, the diaphragms 10 can be cooled further.

Additionally, as the plurality of expansion slides move outward in the radial direction of the diaphragm 10, gaps may be formed between the plurality of expansion slides. The robot can be inserted into the gap formed between the plurality of expansion slides and press the diaphragm 10 to extract the diaphragm 10 from the injection mold 100.

Through this, the diaphragm 10 can be taken out after sufficient cooling of the diaphragm 10, thereby reducing the probability of tearing or defects that may occur when taking out the diaphragm 10. Productivity can be improved.

In addition, the technology of separating part of the diaphragm 10 from the mold as the injection mold 100 changes to the open state as before can be applied to the cube injection mold 100 utilizing four sides as in the disclosed invention. It can be difficult.

Therefore, the disclosed invention has the technical effect of being able to cool and take out the diaphragm 10 while the injection mold 100 is fixed in the horizontal direction using an expansion slide.

In addition, in the disclosed invention, while the diaphragm 10 is injected from the first middle core 1341 and the third middle core 1343, respectively, the second middle core 1342 and the fourth middle core 1344 are formed. The diaphragm 10 can be taken out, which has the technical effect of reducing the cycle time of the diaphragm 10 by utilizing the four sides of the injection mold 100.

Figure 8 is a diagram showing a state before the expansion slide moves in the diaphragm injection mold according to an embodiment of the disclosed invention. FIG. 9 is a diagram showing a state in which the first expansion slide moves in the injection mold for the diaphragm shown in FIG. 8. FIG. 10 is a diagram showing a state in which the second expansion slide moves together with the first expansion slide in the injection mold for the diaphragm shown in FIG. 9.

With reference to FIGS. 8 to 10, the operation of the diaphragm 10 according to the movement of the expansion slide will be described.

The diaphragm 10 may include a body 11 formed in a cylindrical shape. The diaphragm 10 may include an undercut provided at one end of the body 11 and connected to the main body frame of the washing machine. The body 11 may be formed along the outer peripheral surface of the body core 138 to have a ring shape.

The undercut may include a first undercut 12 and a second undercut 13. The first undercut 12 may be provided outside the undercut. The second undercut 13 may be provided inside the undercut.

The diaphragm 10 may include a flange portion 14. The flange portion 14 may be provided to connect the body 11 and the undercut. The flange portion 14 may be arranged to unfold along the moving direction of the expansion slide, as will be described later.

The diaphragm 10 may be provided to prevent water from the washing machine tub from leaking to the outside of the cabinet. Additionally, it is possible to minimize the transmission of vibration that occurs when the washing machine operates to the washing machine body.

The diaphragm 10 may be made of an injection molded product of thermoplastic elastomer (TPE). Since thermoplastic elastomers have elasticity like rubber, the diaphragm 10 made of thermoplastic elastomers can effectively attenuate vibrations occurring in a washing machine. Additionally, the productivity of the diaphragm 10 can be improved compared to when molding EPDM rubber by compressing it.

Referring to Figures 8 to 10, the expansion slide is a first expansion slide 135 that forms a first undercut 12, which is outside the undercut together with the core module, and a first expansion slide 135 is inside the undercut. It may include a second extension slide 136 forming a second undercut 13.

The second expansion slide 136 may be disposed inside the first expansion slide 135.

The first extension slide 135 and the second extension slide 136 can move parallel to the middle core.

As shown in FIG. 8, the first undercut 12 of the diaphragm 10 is formed between the first expansion slide 135 and the second expansion slide 136, and the second undercut of the diaphragm 10 (13) may be formed between the second expansion slide 136 and the body core 138. The flange portion 14 may connect the body 11 and the first undercut 12 and the second undercut 13 and may form an edge of the diaphragm 10.

As shown in FIG. 9 , the first expansion slide 135 may move along the radial direction of the diaphragm 10.

For example, the upper extension slide 1351 may move upward, and the lower extension slide 1353 may move downward. Although not shown in the drawing, the right extension slide 1352 and the left extension slide 1354 can move to the right and left, respectively.

At this time, as the first undercut 12 of the diaphragm 10 moves along the first expansion slide 135, the flange portion 14 of the diaphragm 10 may expand outward in the radial direction.

As shown in FIG. 10 , after the first extension slide 135 moves a predetermined distance in the radial direction, the second extension slide 136 may also move in the radial direction.

At this time, as the second undercut 13 of the diaphragm 10 moves along the second expansion slide 136, the flange portion 14 of the diaphragm 10 may be expanded further than the state shown in FIG. 9. there is.

By allowing the second expansion slide 136 to move along the first expansion slide 135, a certain level of pressure is applied to the first undercut 12 and the second undercut 13 of the diaphragm 10, thereby causing the diaphragm to move. (10) This tearing phenomenon can be minimized.

Therefore, according to one embodiment of the disclosed invention, the diaphragm 10 can be taken out using an expansion slide after the diaphragm 10 has been sufficiently cooled.

In addition, according to one embodiment of the disclosed invention, the diaphragm 10 can be molded using the four sides of the injection mold and the pre-molded diaphragm 10 can be taken out, and the cycle time can be improved. .

In addition, according to one embodiment of the disclosed invention, in an injection mold using four sides, the diaphragm 10 can be molded by rear injection by providing a heat runner in the middle core module, thereby providing consumer convenience. The aesthetics of the exposed front surface of the diaphragm 10 can be improved.

Unlike the injection mold 100 of the diaphragm 10 shown in FIGS. 1 to 10, the injection mold 100 of the diaphragm 10 shown in FIG. 11 has a gate 137a formed in only one direction.

Configurations not described below may be prepared in the same way as those in FIGS. 1 to 10 and may use the same reference numerals.

The nozzle frame 131a may be provided to support a plurality of injection nozzles 132a. The gate 137a may be disposed on only one side of the nozzle frame 131a.

Therefore, in the diaphragm 10 formed by the injection mold 100 according to an embodiment of the disclosed invention, molding material flows from one side from the core module toward the middle core module 130, and the diaphragm 10 The molding material may flow out from the middle core module 130 through a plurality of injection nozzles and be injected backward to form the inner surface of the .

This can be applied to a general injection molding machine, not a two-way injection molding machine.

In the above, specific embodiments are shown and described. However, it is not limited to the above-mentioned embodiments, and those skilled in the art can make various changes without departing from the gist of the technical idea of the invention as set forth in the claims below. .

Claims

In an injection mold for forming a diaphragm,

a core module provided to form a first surface of the diaphragm; and

It includes a middle core module provided to face the first core module and forming a second side opposite to the first side of the diaphragm.

The middle core module is

a middle core disposed to face the core module; and

An expansion slide movably mounted on the middle core to form an undercut of the diaphragm, the expansion slide moving along the radial direction of the diaphragm to expand the edge of the diaphragm outward in the radial direction. injection mold.
According to paragraph 1,

The expansion slides are provided in plural,

As the plurality of expansion slides move in the radial direction of the diaphragm, a gap is formed between the plurality of expansion slides so that a robot takes out the diaphragm.
According to paragraph 1,

The core module is a first core module,

An injection mold further comprising a second core module located on the opposite side of the first core module based on the middle core module.
According to clause 3,

The middle core is

a first middle core facing the first core module;

a second middle core arranged to be perpendicular to the first middle core;

a third middle core facing the second core module; and

An injection mold including; a fourth middle core disposed orthogonal to the first middle core and the third middle core.
According to paragraph 4,

The first middle core, the second middle core, the third middle core, and the fourth middle core are arranged orthogonally to each other and are provided in the same shape.
According to paragraph 4,

An injection mold in which a diaphragm is injected between the first middle core and the first core module, and at the same time, a diaphragm is injected between the third middle core and the second core module.
According to clause 6,

As the middle core module rotates 90 degrees, the diaphragm created between the first middle core and the first core module and the diaphragm created between the third middle core and the second core module are exposed to the outside. Injection molds are exposed to cold, cooled, and each ejected by a robot.
According to clause 6,

As the middle core module rotates 90 degrees and the first core module, the middle core module, and the second core module are closed, a diaphragm is injected between the first core module and the second middle core, An injection mold in which a diaphragm is simultaneously injected between the second core module and the fourth middle core.
According to paragraph 1,

The diaphragm is

An injection mold comprising a flange portion connected to the undercut and extending along a moving direction of the expansion slide.
According to clause 9,

The extended slide is

a first expansion slide forming a first undercut outside the undercut together with the core module; and

An injection mold including; a second expansion slide forming a second undercut inside the undercut together with the first expansion slide.
According to clause 10,

An injection mold in which the first expansion slide first moves a predetermined distance in the radial direction and then the second expansion slide moves in the radial direction.
According to paragraph 1,

The middle core module is provided as a heat runner, and a plurality of injection nozzles extend from the middle core module toward the core module.
According to clause 12,

The core module is a first core module,

It further includes a second core module located opposite to the middle core module,

The diaphragm allows molding material to flow from both sides from the outside of the first core module and the second core module toward the middle core module, and from the middle core module through the plurality of injection nozzles to form an inner surface. An injection mold in which the molding material is injected backwards by flowing out.
According to clause 12,

The diaphragm is rearwardly injected by molding material flowing in from one side from the core module toward the middle core module and molding material flowing out from the middle core module through the plurality of injection nozzles to form an inner surface.
According to paragraph 1,

An injection mold in which four expansion slides are provided to move in the up, down, left, and right directions, respectively.