WO2021141277A1

WO2021141277A1 - Washing machine diaphragm manufacturing method and injection mold

Info

Publication number: WO2021141277A1
Application number: PCT/KR2020/018675
Authority: WO
Inventors: 양예호; 진길화; 김성훈; 문병오; 이현섭; 최재훈
Original assignee: 삼성전자주식회사
Priority date: 2020-01-09
Filing date: 2020-12-18
Publication date: 2021-07-15
Also published as: KR20210089966A

Abstract

An injection mold for forming the diaphragm of a washing machine is disclosed. The injection mold comprises: a first core for forming the front surface of the diaphragm; a second core facing the first core; a first intermediate core which is provided between the first core and the second core, and which has a shape corresponding to the inner surface of the diaphragm; a second intermediate core having a shape corresponding to a portion of the outer surface of the diaphragm; a front slide which is disposed between the first core and the second core so as to form an undercut on a portion of one end of the diaphragm, and which is movable with respect to the second intermediate core; and a rod having an inclined part on one end thereof, and a horizontal part for interfering with the front slide so as to prevent the movement of the front slide with respect to the second intermediate core when the diaphragm is removed.

Description

Manufacturing method and injection mold for diaphragm for washing machine

The present 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 processes laundry such as clothes and bedding using electricity. A washing machine includes a cabinet having an opening, a tub installed in the cabinet, and a drum rotatably installed in the tub. In addition, the washing machine includes a door for opening and closing the opening of the cabinet. The washing machine accommodates the laundry in the drum and supplies water and detergent into the drum. Rotate the drum to remove contaminants from the received laundry.

In addition, the washing machine includes a diaphragm for preventing water supplied to the drum from leaking into the cabinet through the gap between the drum and the door. The diaphragm can minimize the transmission of vibration of the tub to the cabinet.

Such a diaphragm may be injection molded through a mold.

In general, when the injection-molded diaphragm is separated from the mold, the vertical movement distance according to the horizontal movement distance of the mold is fixed for the slide that assists in releasing the diaphragm. If the vertical movement distance of the slide is large, the diaphragm may not be completely released. In addition, if the vertical movement distance of the slide is small, the diaphragm may be excessively stretched or torn, which may result in product failure.

One aspect of the present invention provides an improved method for manufacturing a diaphragm and an injection mold capable of controlling the distance or time for separating the diaphragm from the mold.

Another aspect of the present invention provides an improved method for manufacturing a diaphragm and an injection mold capable of assisting in releasing the diaphragm.

An injection mold for molding a diaphragm for a washing machine according to an aspect of the present invention includes a first core provided to form a front surface of the diaphragm, a second core provided to face the first core, the first core and the A first intermediate core provided between the second cores and having a shape corresponding to the inner surface of the diaphragm, a second intermediate core having a shape corresponding to a portion of the outer surface of the diaphragm, the first core and the second intermediate core A front slide disposed between cores and provided to form an undercut in a portion of one end of the diaphragm, the front slide provided movably with respect to the second intermediate core and the second intermediate when the diaphragm is released and a rod having a horizontal portion interfering with the front slide to prevent movement of the front slide relative to the core and an inclined portion at one end.

The front slide includes an upper slide forming the undercut, and a rod slide coupled to the upper slide and having a rod receiving portion through which the rod passes.

The horizontal portion and the inclined portion of the rod are a first horizontal portion and a first inclined portion, and the rod slide includes a second horizontal portion in contact with the horizontal portion of the rod and a second inclined portion in contact with the inclined portion of the rod.

The injection mold further includes a spring provided by compression between the second intermediate core and the rod slide.

In the injection mold, when the rod slide moves horizontally with respect to the rod in a state where the rod is penetrated together with the second intermediate core, when the rod slide passes the horizontal portion of the rod, the rod slide is A first state that does not move in a radial direction with respect to the core, a second state in which the rod slide moves radially with respect to the second intermediate core along the inclined portion by the elastic restoring force of the spring when passing through the inclined portion of the rod include status.

In the first state, a portion of the undercut is engaged between the rod slide and the second intermediate core and moves horizontally together, so that the upper part of the diaphragm is separated from the first intermediate core, and in the second state, the undercut is released and the external force acting on the upper part of the diaphragm disappears.

The undercut is a first undercut, and the second core includes a flow path provided to discharge air to one side of the second undercut formed at the other end of the diaphragm.

The injection mold further includes a plurality of rear slides provided to form a second undercut at the other end of the diaphragm, and a plurality of rear slides provided to be movable with respect to the first intermediate core and the second core. .

The plurality of rear slides includes a first rear slide having a shape corresponding to an inner surface of a first flange extending radially outwardly from the second undercut and an outer surface of a second flange extending in a radial direction in the second undercut and the first flange. and a second rear slide having a shape corresponding to the outer surface.

The second core includes a flow path provided to discharge air, and discharges air to one side of the second flange through the flow path to release the vacuum state of the second undercut.

The surface of the first intermediate core is coated to reduce frictional force between the diaphragm and the first intermediate core.

The front slide is a first front slide, and the injection mold is a second front slide forming the other part of the undercut, from a second front slide provided to be movable with respect to the second intermediate core and from the first core. It further includes an angular pin protruding to pass through the second front slide and inclined to move the second front slide relative to the second intermediate core.

The second front slide includes an angular pin receiving portion through which the angular pin passes, and the angular pin receiving portion is inclined at the same angle as the inclination angle of the angular pin.

The injection mold further includes a spring provided by being compressed between the second intermediate core and the second front slide, and the first core moves in the horizontal direction together with the angular pin by the elastic restoring force of the spring. The second front slide moves radially along the outer surface of the angular fin.

An injection mold for molding a diaphragm for a washing machine according to another aspect of the present invention includes a first core provided to form a front surface of the diaphragm, a second core facing the first core, the first core and the second core A first intermediate core provided between the cores and having a shape corresponding to the inner surface of the diaphragm, a second intermediate core having a shape corresponding to a portion of the outer surface of the diaphragm, and the first core and the second intermediate core A front slide disposed between to form an undercut in a portion of one end of the diaphragm, wherein the front slide is provided to be movable with respect to the second intermediate core and the second intermediate core when the diaphragm is released an upper slide forming the undercut and a rod having a first horizontal portion interfering with the front slide to prevent movement of the front slide and a rod having a first inclined portion at one end thereof, the front slide engaging with the upper slide and a rod slide through which the rod passes, including a rod slide including a second horizontal portion in contact with the first horizontal portion and a second inclined portion in contact with the first inclined portion.

In the injection mold, when the second intermediate core moves in a horizontal direction together with the rod slide, when the second horizontal portion of the rod slide comes into contact with the first horizontal portion of the rod, the rod slide moves to the second intermediate core. In the first state that does not move radially with respect to the rod slide, when the second inclined portion of the rod slide passes the first inclined portion of the rod, the rod slide moves radially with respect to the second intermediate core along the first inclined portion. and a second state to be

In a method for manufacturing a diaphragm for a washing machine according to an aspect of the present invention, a molding material is injected into a cavity formed by a plurality of cores and a plurality of slides to injection-mould the diaphragm for a washing machine, and the front surface of the diaphragm is exposed. A first core provided to form the front surface of the diaphragm moves in a horizontal direction, and a second intermediate core provided to form an undercut at one end of the diaphragm to separate an upper portion of the diaphragm from the first intermediate core. and the front slide moves in the horizontal direction while pressing the undercut together, the front slide moves radially so that the pressure on the undercut is released, and taking out the diaphragm whose upper part is separated from the injection mold do.

The undercut is a first undercut, and a second end formed at the other end of the diaphragm from when the first core moves in a horizontal direction until the diaphragm is taken out so that the diaphragm is easily separated from the injection mold. On one side of the undercut, air is blown out.

By controlling the vertical movement of the slide according to the horizontal movement of the injection mold, the defect rate that occurs when the diaphragm is released can be reduced.

When the diaphragm is released, air is blown out from one side to prevent the diaphragm from being damaged by frictional force.

By blasting and coating a part of the core in contact with the diaphragm, the diaphragm can be easily separated from the core.

By controlling the time for forced separation from the injection mold according to the type of diaphragm, the defect rate can be reduced and productivity can be improved by automatically taking out the diaphragm.

1 is a cross-sectional view of a diaphragm for a washing machine according to an embodiment of the present invention.

2 is a plan view of a part of a diaphragm injection mold for a washing machine according to an embodiment of the present invention.

3 is a view showing a rod and a rod slide of a diaphragm injection mold for a washing machine according to an embodiment of the present invention.

4 is a cross-sectional view illustrating a diaphragm injection mold for a washing machine according to an embodiment of the present invention along the line A-A of FIG. 2 .

FIG. 5 is a cross-sectional view illustrating a part of a first intermediate core of a diaphragm injection mold for a washing machine according to an embodiment of the present invention taken along line B-B of FIG. 2 .

6 is a cross-sectional view illustrating a flow path through which air is ejected in the diaphragm injection mold for a washing machine according to an embodiment of the present invention taken along line B-B of FIG. 2 .

7 is a cross-sectional view illustrating a first operation of the diaphragm injection mold for a washing machine according to an embodiment of the present invention, as shown in FIG. 4 .

8 is a cross-sectional view illustrating a second operation of the diaphragm injection mold for a washing machine according to an embodiment of the present invention, as in FIG. 4 .

9 is a cross-sectional view illustrating a third operation of the diaphragm injection mold for a washing machine according to an embodiment of the present invention as shown in FIG. 4 .

10 is a cross-sectional view illustrating an operation of automatically taking out a diaphragm for a washing machine according to an embodiment of the present invention.

11 is an enlarged cross-sectional view of the slide of FIG. 8 and a configuration around the slide.

12 is an enlarged cross-sectional view of the slide of FIG. 9 and a configuration around the slide.

The configuration shown in the embodiments and drawings described in this specification is only a preferred example of the disclosed invention, and there may be various modifications that can replace the embodiments and drawings of the present specification at the time of filing of the present application.

In addition, the same reference numbers or reference numerals in each drawing in the present specification indicate parts or components that perform substantially the same functions.

In addition, the terms used herein are used to describe the embodiments, and are not intended to limit and/or limit the disclosed invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It does not preclude the possibility of the presence or addition of figures, numbers, steps, operations, components, parts, or combinations thereof.

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

On the other hand, the terms "up and down direction", "lower side", "front-back direction", etc. used in the following description are defined based on the drawings, and the shape and position of each component is not limited by these terms.

Referring to FIG. 1 , a diaphragm 10 used in a washing machine may include a body 11 formed in a cylindrical shape. The diaphragm 10 may include a first undercut 12 provided at one end of the body 11 and connected to the body frame. The diaphragm 10 may include a second undercut 13 provided at the other end of the body 11 and connected to the tub and drum of the washing machine.

The second undercut 13 may include a first flange 13a extending radially outwardly and a second flange 13b extending radially inwardly.

The diaphragm 10 may prevent water in the tub from leaking to the outside of the cabinet. In addition, it is possible to reduce the transmission of vibrations generated during operation of the washing machine to the washing machine body.

The diaphragm 10 may be formed of an injection molded product made of a thermoplastic elastomer (TPE). Since the thermoplastic elastomer has elasticity like rubber, the diaphragm 10 formed of the thermoplastic elastomer (TPE) can effectively attenuate vibrations generated in the washing machine. In addition, it is possible to improve productivity compared to the compression molding of EPDM rubber.

2 is a plan view of a part of a diaphragm injection mold for a washing machine according to an embodiment of the present invention. 3 is a view showing a rod and a rod slide of a diaphragm injection mold for a washing machine according to an embodiment of the present invention. 4 is a cross-sectional view illustrating a diaphragm injection mold for a washing machine according to an embodiment of the present invention along the line A-A of FIG. 2 .

As shown in FIG. 2 , the injection mold 100 of the diaphragm 10 for a washing machine has at least one first front for forming a first undercut 12 on a portion of one side of the diaphragm 10 for a washing machine. A slide 110 may be included. Here, a portion of one side of the diaphragm 10 for a washing machine may be an upper portion of the diaphragm 10 . The injection mold 100 of the diaphragm 10 for a washing machine may include a rod 200 .

The rod 200 may be provided to pass through the first front slide 110 . The rod 200 may guide the movement of the first front slide 110 in the radial direction. Although it is illustrated that there are two first front slides 110 in FIG. 2 , the present invention is not limited thereto and the first front slides 110 may be provided as one or a plurality of two or more. Accordingly, the number of rods 200 may also vary. Details on this will be described later.

Referring to FIG. 3 , the rod 200 may be provided to penetrate through the rod slide 112 . The rod 200 may be formed in a substantially parallel bar shape with one end inclined. Accordingly, the rod 200 may include a first horizontal portion 201 and a first inclined portion 202 . The first inclined portion 202 may be connected to the first horizontal portion 201 and formed at an end of the rod 200 . That is, the inclined portion of the rod 200 may be formed only at one end.

The rod slide 112 may include a rod accommodating part 115 provided to be accommodated in the rod slide 112 through the rod 200 .

The rod 200 may pass through the rod slide 112 of the first front slide 110 through the rod receiving part 115 . The rod slide 112 may include a second horizontal portion 113 in contact with the first horizontal portion 201 of the rod 200 . The rod slide 112 may include a second inclined portion 114 in contact with the first inclined portion 202 of the rod 200 . As the rod slide 112 moves horizontally, the first inclined portion 202 of the rod 200 and the second inclined portion 114 of the rod slide 112 may come into contact with each other.

The first inclined portion 202 of the rod 200 may be inclined at an angle of approximately 10 to 30 degrees with respect to the first horizontal portion 201 . Preferably, it may have an inclination angle of 20 degrees. However, the present invention may not be limited thereto.

The radial movement distance of the rod slide 112 may be determined according to the angle of the first inclined portion 202 . Therefore, the angle of inclination of the first inclined portion 202 with respect to the first horizontal portion 201 may be formed such that the radial movement distance of the rod slide 112 is designed to be about 10 mm. Details of the operation will be described later.

As shown in FIG. 4 , the diaphragm injection mold 100 for a washing machine (hereinafter referred to as the injection mold 100 ) may include a first fixing plate 101 and a second fixing plate 102 .

The injection mold 100 may include a first core 103 that is fixedly installed on the first fixing plate 101 . The injection mold 100 may include a second core 104 that is fixedly installed on the second fixing plate 102 . The second core 104 may be disposed to face the first core 103 .

The first core 103 may be provided on the front side of the cavity into which the injection product is injected to form the diaphragm 10 . Through this, the first core 103 may be provided to form the front surface of the diaphragm 10 .

The injection mold 100 may include a first intermediate core 105 and a second intermediate core 106 . The first intermediate core 105 may be fixedly installed on the second core 104 . The first intermediate core 105 may be provided between the first core 103 and the second core 104 . The second intermediate core 106 is disposed on the radially outer side of the first intermediate core 105 , with respect to the second core 104 and the first intermediate core 105 and the second fixing plate 102 fixed thereto. It may be provided to be movable horizontally.

The first intermediate core 105 may have a shape corresponding to the inner surface of the diaphragm 10 . The second intermediate core 106 may have a shape corresponding to a portion of the outer surface of the diaphragm 10 . Specifically, the second intermediate core 106 may have a shape corresponding to the outer surface of the body 11 of the diaphragm 10 .

Any one of the first core 103 and the second core 104 is movably installed so that the distance between the first core 103 and the second core 104 may be changed. In the present invention, the first fixing plate 101 and the first core 103 fixedly coupled to the first fixing plate 101 may be movably installed. Through this, the first core 103 may move away from the second core 104 to separate the diaphragm 10 from the injection mold 100 . Also, as described above, the second intermediate core 106 may also move in a direction away from the second core 104 . Details regarding the operation of the plurality of cores will be described later.

The injection mold 100 may include a plurality of front slides 110 and 120 and a plurality of

rear slides

131 , 132 , 133 and 134 .

The plurality of front slides 110 and 120 may be disposed between the first core 103 and the second intermediate core 106 . The plurality of front slides 110 and 120 may be coupled to the second intermediate core 106 . The plurality of front slides 110 and 120 may be provided to be movable with respect to the second intermediate core 106 . Specifically, the plurality of front slides 110 and 120 may be provided to be movable in the radial direction with respect to the second intermediate core 106 .

The plurality of front slides 110 and 120 may be provided to form the first undercut 12 at one end of the diaphragm 10 . The plurality of front slides 110 and 120 may include a first front slide 110 and a second front slide 120 .

The first front slide 110 may be provided to form a first undercut 12 on a portion of one end of the diaphragm 10 . A portion of one end of the diaphragm 10 may be an upper portion of one end of the diaphragm 10 .

The first front slide 110 may be provided to approximately form 1/4 of the first undercut 12 . However, the present invention is not limited thereto, and one first front slide 110 may be provided to form 1/2 of the first undercut 12 , or two or more may be provided to further subdivide the first undercut 12 . .

The second front slide 120 may be provided to form the first undercut 12 in another portion of one end of the diaphragm 10 . Another part of one end of the diaphragm 10 may be a lower portion of one end of the diaphragm 10 . The second front slide 120 may be provided to approximately form 1/4 of the first undercut 12 . However, the present invention is not limited thereto, and one second front slide 120 may be provided to form 1/2 of the first undercut 12 , or two or more may be provided to further subdivide the first undercut 12 . . A detailed description of the second front slide 120 will be described later.

The plurality of

rear slides

131 , 132 , 133 , and 134 may be disposed between the second core 104 , the first intermediate core 105 , and the second intermediate core 106 . The plurality of

rear slides

131 , 132 , 133 , and 134 may be provided to be movable with respect to the second core 104 . Specifically, it may be provided to be movable in a radial direction with respect to the second core 104 .

The plurality of

rear slides

131 , 132 , 133 , and 134 may be provided to form the second undercut 13 at the other end of the diaphragm 10 . The plurality of

rear slides

131 , 132 , 133 , and 134 may include a first rear slide 131 , a second rear slide 132 , a third rear slide 133 , and a fourth rear slide 134 . .

The first rear slide 131 and the second rear slide 132 may be provided to form a second undercut 13 on a portion of the other end of the diaphragm 10 . A portion of the other end of the diaphragm 10 may be an upper portion of the other end of the diaphragm 10 . That is, it may be provided to form the second undercut 13 on the upper portion of the diaphragm 10 .

Specifically, the first rear slide 131 corresponds to the inner surface of the first flange 13a extending radially outward from the second undercut 13 and the outer surface of the second flange 13b extending radially inwardly. It may be provided to have a shape.

The second rear slide 132 may be provided to have a shape corresponding to the outer surface of the first flange 13a extending radially outward from the second undercut 13 . The second rear slide 132 may be provided radially outside the first rear slide 131 .

The first rear slide 131 and the second rear slide 132 may be movably coupled to the second fixing plate 102 . Specifically, the first rear slide 131 and the second rear slide 132 may be provided to be movable radially outward with respect to the second fixing plate 102 . In addition, the first rear slide 131 and the second rear slide 132 may be provided to be movable radially outward with respect to the second core 104 fixedly coupled to the second fixing plate 102 . The first rear slide 131 and the second rear slide 132 may be provided to be movable radially outward even with respect to the first intermediate core 105 fixedly coupled to the second core 104 .

The first rear slide 131 and the second rear slide 132 may operate in conjunction with each other. The first rear slide 131 and the second rear slide 132 may be connected to each other through an interlocking pin (not shown). Accordingly, after the second rear slide 132 moves over a predetermined distance, the first rear slide 131 may move by receiving a force through an interlocking pin (not shown).

The third rear slide 133 and the fourth rear slide 134 may be provided to form the second undercut 13 on a portion of the other end of the diaphragm 10 . A portion of the other end of the diaphragm 10 may be a lower portion of the other end of the diaphragm 10 . That is, it may be provided to form the second undercut 13 under the diaphragm 10 .

Specifically, the third rear slide 133 corresponds to the inner surface of the first flange 13a extending radially outward from the second undercut 13 and the outer surface of the second flange 13b extending radially inwardly. It may be provided to have a shape.

The fourth rear slide 134 may be provided to have a shape corresponding to the outer surface of the first flange 13a extending radially outward from the second undercut 13 . The fourth rear slide 134 may be provided radially outside the third rear slide 133 .

The third rear slide 133 and the fourth rear slide 134 may be movably coupled with respect to the second fixing plate 102 . Specifically, the third rear slide 133 and the fourth rear slide 134 may be provided to be movable radially outward with respect to the second fixing plate 102 . Also, the second core 104 fixedly coupled to the second fixing plate 102 may be provided to be movable radially outward.

The third rear slide 133 and the fourth rear slide 134 may be provided to be movable radially outward even with respect to the first intermediate core 105 fixedly coupled to the second core 104 .

The third rear slide 133 and the fourth rear slide 134 may operate in conjunction with each other. The third rear slide 133 and the fourth rear slide 134 may be connected to each other through an interlocking pin (not shown). Accordingly, after the fourth rear slide 134 moves over a certain distance, the third rear slide 133 may move by receiving a force through an interlocking pin (not shown).

The first rear slide 131 , the second rear slide 132 , and the third rear slide 133 and the fourth rear slide 134 are configured separately and operate in conjunction with each other, so that the second undercut 13b is damaged. and can be separated.

3 and 4 , the injection mold 100 may include a rod 200 .

The rod 200 may be fixedly coupled to the second fixing plate 102 . The rod 200 may be formed in a substantially parallel bar shape with one end inclined. Accordingly, the rod 200 may include a first horizontal portion 201 and a first inclined portion 202 . The first inclined portion 202 may be connected to the first horizontal portion 201 and formed at an end of the rod 200 . That is, the inclined portion of the rod 200 may be formed only at one end.

The rod 200 may pass through the second intermediate core 106 , the first front slide 110 , and the first core 103 to be accommodated therein. Each configuration may include

rod receiving portions

103a , 106a , 115 for receiving the rod 200 .

The first front slide 110 may include an upper slide 111 and a road slide 112 .

The upper slide 111 may be provided to form the first undercut 12 . The upper slide 111 may be provided between the first core 103 and the second intermediate core 106 to form a cavity for the diaphragm 10 to be injection molded in front and rear thereof. Through this, the injection material may be injected into the cavity to form the first undercut 12 of the diaphragm 10 . Specifically, an upper portion of the first undercut 12 may be formed through the upper slide 111 .

The rod slide 112 is coupled to the upper slide 111 and may be provided so that the rod 200 passes therethrough. The rod slide 112 may include a rod accommodating part 115 provided to be accommodated in the rod slide 112 through the rod 200 .

The rod 200 may pass through the rod slide 112 of the first front slide 110 through the rod receiving part 115 . The rod slide 112 may include a second horizontal portion 113 in contact with the first horizontal portion 201 of the rod 200 . The rod slide 112 may include a second inclined portion 114 in contact with the first inclined portion 202 of the rod 200 . As the rod slide 112 moves horizontally, the first inclined portion 202 of the rod 200 and the second inclined portion 114 of the rod slide 112 may come into contact with each other. A detailed operation on this will be described later.

The injection mold 100 may include a second front slide 120 and an angular pin 150 .

The angular pin 150 may protrude from the first core 103 and be fixedly coupled to the first core 103 . The angular pin 150 may be provided in a bar shape having a constant inclination with respect to a horizontal plane. The angular pin 150 may pass through the second front slide 120 and the second intermediate core 106 and be accommodated therein.

As described above, the second front slide 120 may be provided to form a lower portion of the first undercut 12 . The second front slide 120 may include a lower slide 121 and an angular pin slide 122 .

The lower slide 121 may be provided to form the first undercut 12 . The lower slide 121 may be provided between the first core 103 and the second intermediate core 106 to form a cavity for the diaphragm 10 to be injection molded in front and rear thereof.

Through this, the injection material may be injected into the cavity to form the first undercut 12 of the diaphragm 10 . Specifically, a lower portion of the first undercut 12 may be formed through the lower slide 121 .

The angular fin slide 122 may be coupled to the lower slide 121 and provided so that the angular fin 150 passes therethrough. The angular pin slide 122 may include an angular pin accommodating part 123 provided so that the angular pin 150 is penetrated and accommodated therein.

The angular pin receiving part 123 may be inclined at the same angle as the inclination angle of the angular pin 150 . A detailed operation on this will be described later.

The injection mold 100 may include

springs

140a and 140b provided by being compressed between the second intermediate core 106 and the rod slide 112 and between the second intermediate core 106 and the angular pin slide 122 . can

The elastic restoring force of the compressed springs (140a, 140b) is the first front slide 110 including the rod slide 112 and the second front slide 120 including the angular pin slide 122 to the second intermediate core ( 106) to provide a radially outward pushing force.

Accordingly, the rod slide 112 may receive a force to move radially outward with respect to the second intermediate core 106 . However, since the first horizontal portion 201 of the rod 200 and the second horizontal portion 113 of the rod slide 112 are in contact with the rod slide 112, the rod slide 112 interferes with the second intermediate core 106. ) may not move about. Even if the rod slide 112 moves horizontally, the rod slide 112 may not move as long as the first horizontal part 201 and the second horizontal part 113 contact each other. However, as will be described later, the rod slide 112 may move along the inclination from the point in time when the first inclined portion 202 and the second inclined portion 114 come into contact while the rod slide 112 moves horizontally.

The angular pin slide 122 may receive a force to move radially outward with respect to the second intermediate core 106 . However, since the angular pin 150 interferes with the angular pin slide 122 , the angular pin slide 122 may not move with respect to the second intermediate core 106 . However, as will be described later, as the angular pin 150 moves horizontally, the angular pin slide 122 may also move along the inclination of the angular pin 150 . Details related to the operation of the rod slide 112 and the angular pin slide 122 will be described later.

FIG. 5 is a cross-sectional view illustrating a part of a first intermediate core of a diaphragm injection mold for a washing machine according to an embodiment of the present invention taken along line B-B of FIG. 2 . 6 is a cross-sectional view illustrating a flow path through which air is ejected in the diaphragm injection mold for a washing machine according to an embodiment of the present invention taken along line B-B of FIG. 2 .

Referring to FIG. 5 , the surface of the first intermediate core 105 may be manufactured by sand blasting and chemical corrosion. The diaphragm 10 may be more easily separated from the first intermediate core 105 by sand blasting and chemical corrosion processing on the surface of the first intermediate core 105 . Through this, it is possible to improve problems such as tearing or excessive stretching of the diaphragm 10 in the process of separating the diaphragm 10 . Therefore, it is possible to improve productivity by reducing the defect rate of the injection mold 100 .

The surface of the first intermediate core 105 provided to form a cavity for injection molding of the diaphragm 10 may be largely divided into three sections.

The first section (A), the second section (B), and the third section (C) are surfaces of the first intermediate core 105 provided to form the inner surface of the diaphragm 10 for a washing machine.

The size of the particles used for the first section (A) sand blasting may be formed to be about 10 micrometers. The size of the particles used for the second section (B) sand blasting may be formed to be about 20 micrometers. The third section (C) may be chemically corroded and processed. However, the numerical value may not be limited thereto.

The first section (A), the second section (B), and the third section (C) of the surface of the first intermediate core 105 may be processed to have different degrees of grinding from each other. The first section A is the side closest to the door of the washing machine on the inner surface of the diaphragm 10 and is a portion that can be exposed to the user. The second section (B) is a portion that is bent once more on the inner surface of the diaphragm 10 and is hardly exposed to the user. Accordingly, the particles used for sand blasting may be provided so that the size of the first section (A) is smaller than the size of the second section (B). Through this, the surface of the diaphragm 10 formed in the first section A may be formed to be smoother than the surface of the diaphragm 10 formed in the second section B.

In addition, the third section (C) is a portion provided to form the second flange (13b) of the second undercut (13), and it is difficult to separate the diaphragm (10) from the first intermediate core (105) to prevent chemical corrosion. can be formed through

The surface of the first intermediate core 105 may be coated after being processed through mechanical polishing or chemical corrosion as described above. The coating method may be an ion shield coating. However, the present invention may not be limited thereto.

Therefore, by grinding and coating the surface of the first intermediate core 105 , the friction force between the diaphragm 10 and the first intermediate core 105 is reduced, so that the diaphragm 10 is more easily removed from the first intermediate core 105 . can be separated.

Referring to FIG. 6 , the injection mold 100 may include a flow path 160 provided to discharge air.

The flow path 160 may be formed in the second core 104 . The flow path 160 may be provided to discharge air to one side of the second undercut 13 formed at the other end of the diaphragm 10 . Specifically, it may be provided to discharge air to one side of the second flange 13b of the second undercut 13 .

Through this, the diaphragm 10 can be easily separated from the first intermediate core 105 . After injection molding of the diaphragm 10 , air may be discharged through the flow path 160 during the process of releasing the diaphragm 10 . By discharging air, the vacuum state between the diaphragm 10 and the first intermediate core 105 may be released.

Therefore, in the process of separating the diaphragm 10 , the diaphragm 10 and the first intermediate core 105 are excessively in close contact with each other, so that problems such as tearing or stretching can be improved. That is, the overall productivity can be improved by reducing the defect rate of the injection mold 100 .

Next, a process in which the diaphragm manufactured in the diaphragm injection mold for a washing machine configured as described above is automatically separated will be described in detail with reference to the drawings.

7 is a cross-sectional view illustrating a first operation of the diaphragm injection mold for a washing machine according to an embodiment of the present invention, as shown in FIG. 4 . 8 is a cross-sectional view illustrating a second operation of the diaphragm injection mold for a washing machine according to an embodiment of the present invention, as in FIG. 4 . 9 is a cross-sectional view illustrating a third operation of the diaphragm injection mold for a washing machine according to an embodiment of the present invention as shown in FIG. 4 . 10 is a cross-sectional view illustrating an operation of automatically taking out a diaphragm for a washing machine according to an embodiment of the present invention.

7 , the first fixing plate 101 and the first core 103 may move horizontally. Since the first core 103 is fixedly coupled to the first fixing plate 101 , it can move horizontally together with the first fixing plate 101 .

The first core 103 may include a rod receiving portion 103a in which the rod 200 is accommodated. Since the rod receiving part 103a is provided with a larger space than the rod 200 , the first core 103 can move horizontally without interference by the rod 200 .

An angular pin 150 may be fixedly coupled to the first core 103 . As the first core 103 moves in the horizontal direction, the angular pin 150 may also move in the horizontal direction.

The spring 140b is compressed between the second front slide 120 and the second intermediate core 106, and as the angular pin 150 moves in the horizontal direction, the second front slide 120 becomes the second intermediate core ( 106) and can move radially outward.

Specifically, the angular pin 150 may be provided to have a constant inclination with respect to a horizontal plane. The angular pin 150 may be inclined to move the second front slide 120 with respect to the second intermediate core 106 . The angular pin slide 122 of the second front slide 120 may include an angular pin receiving part 123 for accommodating the angular pin 150 . Since the angular pin accommodating part 123 may be provided to have the same inclination as the inclination of the angular pin 150, when the angular pin 150 moves in the horizontal direction together with the first core 103, the elastic restoring force of the spring 140b Accordingly, the angular pin slide 122 may move radially outward along the inclination of the outer surface of the angular pin 150 . Through this, the lower portion of the first undercut 12 of the diaphragm 10 may be exposed to the outside.

Through this, the front surface of the diaphragm 10 and the lower portion of the first undercut 12 may be exposed to the outside. As such, the horizontal movement of the first fixing plate 101 and the first core 103 together may be referred to as a first operation. Air may start to be discharged to one side of the second undercut 13 through the flow path 160 (refer to FIG. 6 ) formed in the second core 104 together with the first operation.

As shown in FIG. 8 , after the first operation in which the first fixing plate 101 and the first core 103 move horizontally, the second intermediate core 106 and the plurality of front slides may move together horizontally. This may be referred to as a second operation. In the second operation, the upper portion of the diaphragm 10 may be released from the injection mold 100 .

The second intermediate core 106 and the first front slide 110 may move horizontally together. In this case, the rod 200 may be penetrated through the first front slide 110 . Specifically, the rod 200 may be penetrated through the rod slide 112 of the first front slide 110 .

When the rod slide 112 moves horizontally in a state where the rod 200 is penetrated together with the second intermediate core 106 , the first horizontal portion 201 of the rod 200 and the second of the rod slide 112 . Two horizontal portions 113 may be in contact.

A spring 140a may be compressed and provided between the rod slide 112 and the second intermediate core 106 . Accordingly, the rod slide 112 may receive a force to move radially outward with respect to the second intermediate core 106 . However, the first horizontal portion 201 of the rod 200 interferes with the movement of the second horizontal portion 113 of the rod slide 112 so that the rod slide 112 cannot move with respect to the second intermediate core 106. do. That is, the first front slide 110 cannot move with respect to the second intermediate core 106 .

Accordingly, the upper portion of the first undercut 12 of the diaphragm 10 is interdigitated between the upper slide 111 and the second intermediate core 106 of the first front slide 110 to move horizontally together. On the other hand, the lower part of the first undercut 12 is not engaged because the second front slide 120 has already moved radially outward in the first operation, so it is not affected by the horizontal movement of the second intermediate core 106. may not be

In the second operation, the plurality of

rear slides

131 , 132 , 133 , and 134 may move radially outward. An elastic member (not shown) is mounted on the plurality of

rear slides

131 , 132 , 133 and 134 to receive a force to move radially outward. However, before the second operation, the second intermediate core 106 prevents movement of the plurality of

rear slides

131, 132, 133, and 134 in the radial direction of the plurality of

rear slides

131, 132, 133, 134. can be located in

As the second intermediate core 106 moves in the horizontal direction in the second operation, the plurality of rear slides may move radially outward by the elastic restoring force of the elastic member (not shown).

The first rear slide 131 and the second rear slide 132 are interlocked and movable by an interlocking pin (not shown). After the second rear slide 132 first moves radially outward in accordance with the horizontal movement of the second intermediate core 106 , the first rear slide 131 may move in conjunction therewith. Through this, the upper portion of the second undercut 13 of the diaphragm 10 may be separated from the first rear slide 131 and the second rear slide 132 and exposed to the outside.

Therefore, as described above, the upper part of the first undercut 12 of the diaphragm 10 is bitten between the upper slide 111 and the second intermediate core 106 and moves together horizontally, the second undercut 13 The upper part of the can also move horizontally That is, the upper portion of the diaphragm 10 may be separated from the first intermediate core 105 . In this case, in order for the diaphragm 10 to be easily separated from the first intermediate core 105 , the first intermediate core 105 may be sandblasted and coated as shown in FIG. 5 .

The third rear slide 133 and the fourth rear slide 134 may move in conjunction with each other. After the fourth rear slide 134 first moves radially outward in accordance with the horizontal movement of the second intermediate core 106 , the third rear slide 133 may move in conjunction therewith. Through this, the lower portion of the second undercut 13 of the diaphragm 10 may be separated from the third rear slide 133 and the fourth rear slide 134 and exposed to the outside. That is, the entire lower portion of the diaphragm 10 may be exposed to the outside. However, the diaphragm 10 is attached to the first intermediate core 105 due to a predetermined frictional force.

Even during the second operation, air may be discharged to one side of the second undercut 13 through the flow path 160 (refer to FIG. 6 ) formed in the second core 104 .

Through the second operation, the upper portion of the diaphragm 10 may be separated from the first intermediate core 105 and separated.

Since the rod slide 112 does not move in the radial direction with respect to the second intermediate core 106 in the second operation, this may be referred to as a first state from the viewpoint of the first front slide 110 .

By configuring the first horizontal portion 201 on the rod 200, even if the second intermediate core 106 and the first front slide 110 move in the horizontal direction, the first front slide 110 moves radially outward. You can set a section that doesn't.

Through this, according to the type and size of the diaphragm 10 , the length or time for horizontally moving the diaphragm 10 by biting the diaphragm 10 between the first front slide 110 and the second intermediate core 106 can be adjusted. By adjusting the separation length and separation time of the diaphragm 10 for each type, the defect rate generated in the process of separating the diaphragm 10 from the injection mold can be minimized. As a result, the productivity of the injection mold can be improved.

As shown in FIG. 9 , the second intermediate core 106 and the plurality of front slides may move horizontally together. This may be referred to as a third operation. In the third operation, the upper portion of the diaphragm 10 may not be engaged between the first front slide 110 and the second intermediate core 106 .

In the second operation and the third operation, since there is a difference only in whether the first front slide 110 moves in the radial direction, it will be mainly described.

The first front slide 110 may receive a force to move radially outward with respect to the second intermediate core 106 by the elastic restoring force of the spring 140a. As the first front slide 110 continues to move horizontally, the rod 200 may no longer pass through the first front slide 110 . Through this, the radial outward movement of the first front slide 110 may be prevented from being interfered with. Accordingly, the first front slide 110 may move radially outward.

When the first front slide 110 moves outward in the radial direction, the first undercut 12 bitten between the first front slide 110 and the second intermediate core 106 is no longer bitten. That is, the pressure on the first undercut 12 may be released. Accordingly, the external force acting on the upper portion of the diaphragm 10 may disappear. At this time, the upper portion of the diaphragm 10 is drooping downward by gravity.

Even during the third operation, air may be continuously discharged to one side of the second undercut 13 through the flow path 160 (refer to FIG. 6 ) formed in the second core 104 .

In the third operation, the rod slide 112 may move in a radial direction. This may be referred to as a second state from the viewpoint of the first front slide 110 .

As shown in FIG. 10 , the robot 170 may automatically take out the diaphragm 10 from which the upper part is separated. The upper portion of the diaphragm 10 is separated from the injection mold 100 through the first operation, the second operation, and the third operation, and the lower portion of the diaphragm 10 is the minimum with respect to the first intermediate core 105 . Since it is attached while maintaining only frictional force, the robot 170 can easily take out the diaphragm 10 .

11 is an enlarged cross-sectional view of the slide of FIG. 8 and a configuration around the slide. 12 is an enlarged cross-sectional view of the slide of FIG. 9 and a configuration around the slide.

An operation between the rod 200 and the first front slide 110 will be described in detail with reference to FIGS. 11 and 12 .

11 , the rod 200 may include a first horizontal portion 201 and a first inclined portion 202 . 10 shows a first state of the first front slide 110, in the first state, the first horizontal portion 201 of the rod 200 is the second horizontal portion 113 of the first front slide 110 can be accessed with

The first horizontal portion 201 of the rod 200 may serve to prevent radial movement of the first front slide 110 .

A spring 140a may be compressed and provided between the rod slide 112 of the first front slide 110 and the second intermediate core 106 . Due to the elastic restoring force of the spring 140a, the first front slide 110 may receive a force to move outward in the radial direction. The first horizontal portion 201 of the rod 200 presses the second horizontal portion 113 of the first front slide 110 so that the first front slide 110 does not move in the radial direction.

Since the first front slide 110 does not move in the radial direction, the first undercut 12 of the diaphragm 10 is interdigitated between the first front slide 110 and the second intermediate core 106 to be horizontally together. can move As described above, since the first rear slide 131 and the second rear slide 132 also move in the radial direction along the inclined surface of the second intermediate core 106 by the horizontal movement of the second intermediate core 106, the diamond The second undercut 13 of the fram 10 may be exposed to the outside.

Accordingly, as the first undercut 12 of the diaphragm 10 is pressed and moved, the entire upper portion of the diaphragm 10 may be separated from the first intermediate core 105 .

12 shows the second state of the first front slide 110, in the second state, the second inclined portion 114 of the first front slide 110 is the first inclined portion 202 of the rod 200. While moving along, the first front slide 110 may be separated without being interfered with by the rod 200 .

As the second inclined portion 114 of the first front slide 110 moves along the first inclined portion 202 of the rod 200, the first front slide 110 is moved by the elastic restoring force of the spring 140a. It can move radially outward with respect to the second intermediate core 106 .

As the first front slide 110 moves outward in the radial direction, the pressure applied to the first undercut 12 of the diaphragm 10 that was pressed between the first front slide 110 and the second intermediate core 106 This can be turned off. Accordingly, as the external force acting on the upper portion of the diaphragm 10 disappears, the upper portion of the diaphragm 10 sags downward by gravity.

Therefore, as shown in FIGS. 11 and 12 , a section or time for forcibly separating the diaphragm 10 from the first intermediate core 105 by adjusting the length of the first horizontal portion 201 of the rod 200 . can be adjusted. In addition, by adjusting the length of the first inclined portion 202 of the rod 200 or the angle of the first inclined portion 202, the time for releasing the pressure on the diaphragm 10 can be adjusted. Since the diaphragm 10 for washing machine has various sizes and types, by changing only the configuration of the rod 200 and the front slide according to the type of the diaphragm 10, the defect rate of the injection mold 100 is minimized to increase overall productivity. can be guaranteed

In the above, specific embodiments have been shown and described. However, it is not limited only to the above-described embodiments, and those of ordinary skill in the art to which the invention pertains can make various changes without departing from the spirit of the invention described in the claims below. .

Claims

In an injection mold for molding a diaphragm for a washing machine,

a first core provided to form a front surface of the diaphragm;

a second core provided to face the first core;

a first intermediate core provided between the first core and the second core and having a shape corresponding to an inner surface of the diaphragm;

a second intermediate core having a shape corresponding to a portion of the outer surface of the diaphragm;

a front slide disposed between the first core and the second intermediate core to form an undercut in a portion of one end of the diaphragm, the front slide being movable with respect to the second intermediate core; and

and a rod having a horizontal portion interfering with the front slide and an inclined portion at one end to prevent movement of the front slide with respect to the second intermediate core when the diaphragm is released.
According to claim 1,

The front slide

an upper slide forming the undercut; and

Injection mold including; a rod slide coupled to the upper slide and having a rod receiving portion through which the rod passes.
3. The method of claim 2,

The horizontal portion and the inclined portion of the rod are a first horizontal portion and a first inclined portion,

The road slide

a second horizontal portion in contact with the horizontal portion of the rod; and

Injection mold including; a second inclined portion in contact with the inclined portion of the rod.
3. The method of claim 2,

The injection mold further comprising; a spring provided by compression between the second intermediate core and the rod slide.
5. The method of claim 4,

When the rod slide moves horizontally with respect to the rod in a state where the rod is penetrated together with the second intermediate core

a first state in which the rod slide does not move in a radial direction with respect to the second intermediate core when the rod slide passes the horizontal portion of the rod;

and a second state in which the rod slide moves in a radial direction with respect to the second intermediate core along the inclined portion by the elastic restoring force of the spring when the rod passes the inclined portion.
6. The method of claim 5,

In the first state, the upper part of the diaphragm is separated from the first intermediate core by moving horizontally with a part of the undercut biting between the rod slide and the second intermediate core,

In the second state, the bite of the undercut is released and the external force acting on the upper part of the diaphragm disappears.
According to claim 1,

The undercut is a first undercut,

the second core

An injection mold comprising a; a flow path provided to discharge air to one side of the second undercut formed at the other end of the diaphragm.
According to claim 1,

The injection mold further comprising: a plurality of rear slides provided to form a second undercut at the other end of the diaphragm, the plurality of rear slides provided to be movable with respect to the first intermediate core and the second core.
9. The method of claim 8,

The plurality of rear slides

a first rear slide having a shape corresponding to the inner surface of the first flange extending radially outwardly from the second undercut and the outer surface of the second flange extending radially inwardly; and

Injection mold including; a second rear slide having a shape corresponding to the outer surface of the first flange.
10. The method of claim 9,

The second core includes a flow path provided to discharge air.

An injection mold for discharging air to one side of the second flange through the flow path to release the vacuum state of the second undercut.
According to claim 1,

An injection mold in which a surface of the first intermediate core is coated to reduce frictional force between the diaphragm and the first intermediate core.
According to claim 1,

The front slide is a first front slide,

a second front slide forming the other part of the undercut, a second front slide provided to be movable with respect to the second intermediate core; and

and an angular pin protruding from the first core to pass through the second front slide and inclined to move the second front slide relative to the second intermediate core.
13. The method of claim 12,

The second front slide includes an angular pin receiving part through which the angular pin is penetrated.

The angular pin receiving portion is formed to be inclined at the same angle as the inclination angle of the angular pin.
14. The method of claim 13,

It further includes a spring provided by compression between the second intermediate core and the second front slide.

An injection mold in which the second front slide moves radially along the outer surface of the angular pin by the elastic restoring force of the spring while the first core moves in the horizontal direction together with the angular pin.