KR102656138B1 - Clothes treating apparatus, drum manufacturing apparatus and manufacturing method of drum - Google Patents

Abstract

A drum manufacturing apparatus for manufacturing a drum body having a cylindrical portion and a plurality of expansion portions radially protruding from the cylindrical portion, comprising: an upper mold having a plurality of pressing cams that move up and down, and a lower mold fitting with the upper mold. The lower mold includes a plurality of core molds radially arranged so that their outer sides face the inner surface of the cylindrical portion, and each of the plurality of core molds is arranged to be radially spaced apart from each other and each pressurized by the plurality of pressure cams. A plurality of movable molds configured to move in the radial direction include a plurality of movable molds connected to the plurality of core molds and configured to move together with the plurality of core molds. The plurality of core molds form the plurality of expansion parts by pressing the inner surface of the cylindrical part through movement of the plurality of moving molds.

Description

Clothing processing device, drum manufacturing device and drum manufacturing method {CLOTHES TREATING APPARATUS, DRUM MANUFACTURING APPARATUS AND MANUFACTURING METHOD OF DRUM}

The present invention relates to a clothing processing device, a drum manufacturing device, and a drum manufacturing method. More specifically, it relates to a drum with an improved manufacturing method and a drum manufacturing device and clothing processing device with an improved structure.

A clothing processing device may include a washing machine for washing clothing and a dryer for drying clothing.

A washing machine, an example of a clothing processing device, is a machine that washes clothing using electric power. It generally includes a tub that stores washing water, a drum rotatably installed inside the tub, and a rotatable drum installed at the bottom of the drum. It is equipped with a pulsator, a drum, and a motor for rotating the pulsator.

In such a washing machine, during the washing cycle, the pulsator or drum rotates while the laundry and water are placed inside the drum, and contaminants are separated from the laundry by the water flow formed within the drum. During the rinsing cycle, the drum and the pulsator rotate together. , it operates so that the separated contaminants are dissolved in water.

A pattern is formed on the drum itself to form water flow or improve washing efficiency. Additionally, in order to increase the washing capacity of the drum, the inner diameter of the drum body may be larger than the opening of the drum. Since the drum is formed to be approximately cylindrical, a method of forming the above pattern or expansion portion in such a cylindrical drum is problematic.

One aspect of the present invention provides a clothing processing device with an improved drum structure.

One aspect of the present invention provides a drum manufacturing method that improves drum manufacturing efficiency.

One aspect of the present invention provides a drum manufacturing apparatus for manufacturing drums with improved manufacturing efficiency.

A drum manufacturing apparatus according to the spirit of the present invention is a drum manufacturing apparatus for manufacturing a drum body having a cylindrical part and a plurality of expansion parts radially protruding from the cylindrical part, an upper mold having a plurality of pressure cams that move up and down. ; It includes: a lower mold fitted with the upper mold, wherein the lower mold includes a plurality of core molds radially arranged so that their outer sides face the inner surface of the cylindrical portion; A plurality of movable molds arranged to be radially spaced from each of the plurality of core molds and configured to be movable in the radial direction by being respectively pressed by the plurality of pressure cams, and connected to the plurality of core molds to form the plurality of molds. and a plurality of movable molds configured to move together with the core mold, wherein the plurality of core molds press the inner surface of the cylindrical portion by moving the plurality of movable molds, thereby forming the plurality of expansion portions.

The lower mold may further include a plurality of support molds disposed between the plurality of moving molds and the plurality of core molds to support the outer surface of the cylindrical portion.

The plurality of core molds include a core that is radially convex to form an inner surface of the expansion portion, and the plurality of support molds include a cavity that forms an outer surface of the expansion portion and is concavely formed to correspond to the core. may include.

The pressure cam includes a first pressure surface that presses the plurality of support molds in a central direction; It may include a second pressing surface that presses the plurality of moving molds in a radial direction.

The first pressure surface is formed to be inclined toward the center so as to convert the downward movement of the pressure cam into movement toward the center of the plurality of support molds, and the second pressure surface is formed to cause the downward movement of the pressure cam. It may be formed to be inclined toward the radial direction so as to convert the plurality of moving molds into movement in the radial direction.

The first pressure surface may be disposed lower than the second pressure surface so that the plurality of support molds are pressed by the pressure cam before the plurality of moving molds.

The plurality of moving molds may be configured to be simultaneously pressed by the plurality of pressing cams.

The plurality of expansion parts may be configured to be formed simultaneously.

The plurality of moving molds, the plurality of core molds, and the plurality of support molds may include three moving molds, three core molds, and three support molds each spaced apart at 120 degree intervals. there is.

The plurality of core molds further include a pattern groove formed concavely on an outer surface of the core, and the plurality of support molds have a pattern corresponding to the pattern groove and protruding from a concave surface forming the cavity. It may further include protrusions.

The lower mold includes a plurality of fixed molds disposed radially outer than the plurality of movable molds; It further includes a spring cylinder disposed between the plurality of fixed molds and the plurality of movable molds, and when the pressure by the pressure cam is released, the plurality of movable molds and the plurality of core molds return to the center direction. It can be configured to move.

A method of manufacturing a clothes handling device drum according to the spirit of the present invention includes a plurality of movable molds provided to be movable in the radial direction by a pressure cam, and a plurality of movable molds disposed in a central direction relative to the plurality of movable molds together with the plurality of movable molds. A method of manufacturing a clothing treatment drum using a manufacturing device having a plurality of core molds movable in a radial direction, comprising: forming a flat material into a cylindrical portion; and moving the plurality of moving molds in the radial direction to press the inner surface of the cylindrical portion with the plurality of core molds to form a plurality of expansion portions protruding from the cylindrical portion in the radial direction.

The manufacturing apparatus further includes a plurality of support molds disposed between the plurality of moving molds and the plurality of core molds, and the step of forming the plurality of expansion portions includes forming the plurality of expansion portions by forming the cylindrical portion by the plurality of support molds. It may include a step of supporting the outer surface.

The pressure cam may be configured to press the plurality of support molds in the center direction with a first pressure surface on one side and to press the plurality of moving molds in the radial direction with a second pressure surface on the other side.

The plurality of support molds may be pressed by the pressure cam before the plurality of moving molds.

The plurality of core molds include a pattern groove concavely formed on one surface thereof, and the plurality of support molds include a pattern protrusion protruding toward an outer surface of the cylindrical portion to correspond to the pattern groove. It may further include forming a concave pattern toward the center of the plurality of extensions using the pattern grooves and the pattern protrusions.

The step of forming the plurality of expansion parts and the step of forming the pattern may be performed together.

The plurality of expansion parts may be formed simultaneously by the plurality of core molds.

The flat material may include at least one of stainless steel and mild steel plate.

The flat material may include a plurality of through holes.

A clothing processing device according to the spirit of the present invention includes a main body, a drum that accommodates clothing, and is rotatably provided inside the main body, wherein the drum is a drum body that is provided in a cylindrical shape and is provided to accommodate clothing therein. and an expansion part that protrudes from the drum body in the radial direction of the drum body and a pattern part formed in the expansion part, which includes a protrusion that protrudes more than 1.5 mm from the expansion part or a depression that is depressed by more than 1.5 mm from the expansion part. It may include a pattern portion including.

The pattern portion may further include a plurality of through holes penetrating the pattern portion.

The pattern portion may include a protrusion that protrudes more than 6 mm from the expansion portion.

The pattern portion may include a recessed portion that is depressed by 6 mm or more from the expanded portion.

The drum may further include a lifter protruding from the inner surface of the drum body toward the center of the drum body so that laundry rises and falls when the drum rotates.

The expansion portion and the pattern portion may be provided to expand the volume of the drum body.

The expansion portion may protrude from the drum body by more than 10 mm in the radial direction of the drum body.

According to one aspect of the present invention, the internal volume of the drum can be increased.

According to one aspect of the present invention, the roundness of the drum can be improved.

According to one aspect of the present invention, the expansion portion formed on the side of the drum can be formed uniformly.

1 is a side cross-sectional view of a washing machine according to an embodiment of the present invention.
2 and 3 are perspective views of a washing machine drum body according to an embodiment of the present invention.
Figure 4 is a perspective view of a washing machine drum manufacturing apparatus according to an embodiment of the present invention.
Figure 5 is a cross-sectional view of a washing machine drum manufacturing apparatus according to an embodiment of the present invention.
6 to 9 are diagrams of the operation of the washing machine drum manufacturing apparatus according to an embodiment of the present invention.
Figure 10 is a perspective view of a flat material according to an embodiment of the present invention.
Figure 11 is a view of rolling a flat material according to an embodiment of the present invention.
Figure 12 is a perspective view of a washing machine drum body according to another embodiment of the present invention.
Figure 13 is a cross-sectional view of a washing machine drum manufacturing apparatus according to another embodiment of the present 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 indicate 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, and similarly, the second component may also be named a first component without departing from the scope of the present invention. The term “and/or” includes any combination of a plurality of related stated items or any 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.

A clothing processing device according to the spirit of the present invention may include a washing machine and a dryer. Hereinafter, for convenience of explanation, the clothes treatment apparatus of the present invention will be described using a washing machine as an example.

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

As shown in FIG. 1, the washing machine 1 includes a cabinet 10 forming the exterior, a tub 20 disposed inside the cabinet 10 to store washing water, and an interior of the tub 20. It may include a drum 30 rotatably disposed and a drive motor 40 provided to drive the drum 30.

The cabinet 10 may include a front frame 10a that forms the front exterior of the washing machine 1. Specifically, the front frame 10a of the cabinet 10 may form the front exterior of the washing machine 1 together with the door 50.

Cabinet 10 may include a first opening 12 . Specifically, the front frame 10a of the cabinet 10 may include a first opening 12. The opening 12 of the front frame 10a can be opened and closed by the door 50.

The tub 20 may include a tub body 21. The tub body 21 may include a front tub 21a and a rear tub 21b. The tub body 21 may be formed by combining the front tub 21a and the rear tub 21b. However, the tub body 21 may be formed by combining separate components such as the front tub 21a and the rear tub 21b, as well as the front tub 21a and the rear tub 21b as an integrated unit. It may also be formed as a composition. The tub body 21 may have a cylindrical shape. However, the shape of the tub body 21 is not limited to the above example and can be changed in various ways.

The tub 20 may further include a second opening 22. The second opening 22 may be formed in the front tub 21a to correspond to the first opening 12 of the cabinet 10.

The drum 30 may be placed inside the tub 20 so as to be rotatable about a rotating axis. The drum 30 may have a cylindrical shape.

Drum 30 may include a third opening 31 . The third opening 31 may be formed to correspond to the first opening 12 of the cabinet 10 and the second opening 22 of the tub 20. Laundry may be introduced into the drum 30 through the first opening 12 of the cabinet 10, the second opening 22 of the tub 20, and the third opening 31 of the drum 30. .

A plurality of through holes 34a may be formed in the drum 30 for distribution of washing water. A lifter 39 may be installed on the inner peripheral surface of the drum 30 to allow laundry to rise and fall when the drum 30 rotates.

The drive motor 40 may be mounted on the rear wall 24 of the tub 20. That is, the drive motor 40 may be mounted on the rear tub 21b. The drive motor 40 transmits the stator 41 fixed to the tub 20, the rotor 42 rotatably disposed around the stator 41, and the rotational force of the drive motor 40 to the drum 30. It may include a drive shaft 43 provided to do so. The rotor 42 electromagnetically interacts with the stator 41 to rotate and transmits rotational force to the drive shaft 43. One end of the drive shaft 43 may be coupled to the drum 30, and the other end of the drive shaft 43 may be coupled to the rotor 42. Specifically, the other end of the drive shaft 43 may extend to the outside of the rear wall 24 of the tub 20 and be coupled to the rotor 42. The rotor 42 may be arranged to rotate around the drive shaft 43. The rotation axis of the drum 30 may be implemented by the drive shaft 43. In other words, the rotation axis of the drum 30 may be located on the same line as the drive shaft 43.

The washing machine 1 may further include a door 50 provided to open and close the first opening 12 of the cabinet 10. The door 50 may be installed in the cabinet 10 to be rotatable. The door 50 may include a door glass 52 that allows the user to view the inside of the drum 30, and a door frame 54 that supports the door glass 52.

A water supply pipe 60 may be installed at the top of the tub 20 to supply washing water to the tub 20. One end of the water supply pipe 60 may be connected to an external water supply source (not shown), and the other end of the water supply pipe 60 may be connected to the detergent supply device 62. The detergent supply device 62 may be connected to the tub 20 through a connector 63. Washing water supplied through the water supply pipe 60 is supplied to the inside of the tub 20 along with detergent via the detergent supply device 62.

A drain pump 72 and a drain pipe 74 may be installed at the lower part of the tub 20 to discharge the washing water inside the tub 20 to the outside of the cabinet 10.

The washing machine 1 may further include a diaphragm 80 installed between the tub 20 and the door 50. The diaphragm 80 may be installed to connect the first opening 12 of the cabinet 10 and the second opening 22 of the tub 20. The diaphragm 80 may form a passage from the first opening 12 of the cabinet 10 to the third opening 31 of the drum 30. The diaphragm 80 may serve to reduce vibration transmitted from the tub 20 to the front frame 10a of the cabinet 10 when the drum 30 rotates. Additionally, a portion of the diaphragm 80 is disposed between the door 50 and the front frame 10a to prevent washing water inside the tub 20 from leaking to the outside of the cabinet 10.

The diaphragm 80 may be composed of an injection molded product of thermoplastic elastomer. Since thermoplastic elastomer has elasticity like rubber at room temperature, the diaphragm 80 formed of thermoplastic elastomer can effectively attenuate vibration transmitted from the tub 20 to the front frame 10a of the cabinet 10.

2 and 3 are perspective views of a washing machine drum body according to an embodiment of the present invention.

The drum 30 may be formed in a cylindrical shape with an open top.

The drum 30 may include a drum body 32 and a bottom 33.

The drum body 32 may be formed in a cylindrical shape with one side and the other side open and forming a hollow portion 34c.

The drum body 32 may include a cylindrical portion 34 and a plurality of expansion portions 36. The cylindrical portion 34 may have a circular cross section.

The plurality of extension parts 36 may be configured to protrude from the cylindrical part 34 in the radial direction. In this embodiment, three expansion parts 36 may be formed and may be arranged at regular intervals along the circumference of the drum body 32.

The internal volume of the portion where the plurality of expansion portions 36 are formed and the portion where the plurality of expansion portions 36 are not formed are configured to be different. That is, the volume of the portion of the drum 30 per unit length in the axial direction where the plurality of expansion portions 36 are formed may be referred to as Va, and the volume of the portion where the plurality of expansion portions 36 are not formed may be referred to as Vb. . At this time, Va > Vb can be satisfied. Through the plurality of expansion portions 36, the internal volume can be increased with less material, thereby reducing material costs.

The drum 30 can be formed by forming a flat material 31 into a cylindrical body 34, as shown in FIG. 2, and then forming a plurality of expansion parts 36 on the cylindrical part 34. . As shown in FIG. 3, the flat material 31 may first form a plurality of through holes 34a through a perforation process and then be molded into a cylindrical portion 34. The plurality of expansion portions 36 may be formed by a manufacturing method or manufacturing apparatus 100 that will be described later.

The existing drum 30 was manufactured through a process in which protruding or concave shapes were formed on a flat material 31 and then rolled into a cylindrical shape. Plastic deformation occurred due to the protruding or concave shapes formed in the flat material 31, making it difficult to maintain the cylindrical shape when the flat material 31 was rolled into a circle. However, in the present invention, a process of rolling the flat material 31 into the cylindrical part 34 is performed first, and then a plurality of expansion parts 36 can be formed on the cylindrical part 34 at the same time. Through this, the roundness of the drum 30 can be improved. Additionally, through this process, the height of the plurality of extensions 36 from the drum body 32 can be increased. Additionally, the internal volume of the drum body 32 can be increased compared to the cylindrical portion 34.

The inner diameter of the drum body 32 and the size of the expansion portion 36 are not limited. In this embodiment, the inner diameter of the drum body 32 in the portion where the expanded portion 36 is not formed may be formed to be approximately 488 mm. The expansion portion 36 may protrude from the drum body 32 by more than 10 mm in the radial direction of the drum body 32. For example, the expansion portion 36 may protrude approximately 14 mm in the radial direction from the outer surface of the drum body 32.

The following describes the washing machine drum manufacturing apparatus of the present invention.

Figure 4 is a perspective view of a washing machine drum manufacturing apparatus according to an embodiment of the present invention, and Figure 5 is a cross-sectional view of a washing machine drum manufacturing apparatus according to an embodiment of the present invention.

6 to 9 are diagrams of the operation of the washing machine drum manufacturing apparatus according to an embodiment of the present invention.

The manufacturing apparatus 100 for the washing machine drum 30 may include an upper mold 110 and a lower mold 130.

The upper mold 110 may be configured to engage with the upper part of the lower mold 130. The upper mold 110 can prevent the drum body 32 from being separated from the lower mold 130 during the manufacturing process of the drum body 32. The upper mold 110 can move up and down and be joined with the lower mold 130.

The upper mold 110 may have a pressure cam 120 that moves up and down. The pressure cam 120 is provided to move up and down from the upper mold 110, and is configured to pressurize a plurality of moving molds 150, which will be described later, in the radial direction.

The lower mold 130 may include a plurality of core molds 140. The plurality of core molds 140 may be arranged radially from the center. That is, the plurality of core molds 140 may be arranged in the radial direction. The plurality of core molds 140 may be arranged to be spaced apart at equal intervals in the circumferential direction. The plurality of core molds 140 may be arranged to face the inner surface of the cylindrical portion 34. The cylindrical portion 34 may be mounted on the lower mold 130 so that its inner surface faces the plurality of core molds 140 as shown in FIG. 5 . In this embodiment, the plurality of core molds 140 are provided in the radial direction and may include three core molds 140 spaced apart at an interval of 120 degrees.

The core mold 140 includes a core 142 that protrudes outward, and the core 142 may form an expansion portion 36 in the cylindrical body. The core 142 may be formed to be convex in the radial direction.

The lower mold 130 may include a plurality of moving molds 150.

The plurality of moving molds 150 may be disposed radially outward from each of the plurality of core molds 140. In this embodiment, the plurality of movable molds 150 are arranged to be spaced apart in the radial direction of the plurality of core molds 140, and may include three movable molds 150 spaced apart at 120 degree intervals. The plurality of movable molds 150 may be pressed by the pressure cam 120 and moved in the radial direction. The plurality of moving molds 150 may be connected to the plurality of core molds 140 and configured to operate in the same direction. That is, the plurality of movable molds 150 are moved in the radial direction by the pressure cam 120, and the plurality of core molds 140 are also moved in the radial direction. In this process, the cores 142 of the plurality of core molds 140 can form an expansion portion 36 with respect to the cylindrical body.

The plurality of moving molds 150 and the plurality of core molds 140 may be connected by a connecting portion 154. The plurality of moving molds 150, the connecting portions 154, and the plurality of core molds 140 may be formed as one body.

The lower mold 130 may include a plurality of support molds 160.

The plurality of support molds 160 may be disposed radially outward from each of the plurality of core molds 140. A plurality of support molds 160 may be disposed between a plurality of core molds 140 and a plurality of moving molds 150. The cylindrical portion 34 may be mounted between a plurality of support molds 160 and a plurality of core molds 140. In this embodiment, the plurality of support molds 160 are spaced apart in the radial direction of the plurality of core molds 140 and may include three support molds 160 spaced apart at 120 degree intervals.

The plurality of support molds 160 may include a concave cavity 164 to correspond to the core 142 of the plurality of core molds 140.

The plurality of support molds 160 may be pressed by the pressure cam 120 and moved toward the center. That is, the plurality of support molds 160 are configured to move toward the center by the pressure cam 120 to support the outer surface of the cylindrical shape.

The pressure cam 120 may include a first pressure surface 121 that presses the plurality of movable molds 150 and a second pressure surface 122 that presses the plurality of support molds 160. The first pressure surface 121 may be configured to be inclined toward the radial direction, and the second pressure surface 122 may be configured to be inclined toward the center direction. The plurality of moving molds 150 may include an inclined first pressurized surface 161 that is pressed by the inclined first pressurized surface 121 . The plurality of support molds 160 may include an inclined second pressurized surface 152 that is pressed by the inclined second pressurized surface 122 .

The pressure cam 120 moves downward and presses the plurality of moving molds 150 in the radial direction with the first pressure surface 121, and presses the plurality of support molds 160 in the center direction with the second pressure surface 122. It is configured to pressurize.

The pressure cam 120 may press the plurality of support molds 160 before the plurality of moving molds 150 while moving downward. Through this process, the core mold 140 operates while stably supporting the outer surface of the cylindrical portion 34, so that the expansion portion 36 or the pattern portion 35 of the drum 30 is uniformly distributed in various directions. can be formed.

The first pressure surface 121 may be located above the second pressure surface 122 so that the pressure cam 120 can operate the support mold 160 first. That is, after the second press surface 122 presses the second press surface 152 and presses the plurality of support molds 160 in the center direction, the first press surface 121 presses the second press surface 152 ( 161) can be pressed to pressurize the plurality of moving molds 150 and the plurality of core molds 140 in the radial direction.

For this purpose in the present embodiment, the first pressure surface 121 is shown to be disposed lower than the second pressure surface 122. However, the vertical positions of the first and second press surfaces 121 and 122 and the first and second press surfaces 161 and 152 are not limited. 6 to 8, the pressure of the first pressing surface 121 against the first pressed surface 161 is the second pressing surface against the second pressed surface 152 ( It may be configured to occur before the pressurization of 122). Through this, the support mold 160 can be pressed by the pressure cam 120 before the moving mold 150.

The pressure cam 120 may include a first support surface 123 and a second support surface 124. The support mold 160 can be moved toward the center by the first pressure surface 121 of the pressure cam 120. When the pressure cam 120 moves further downward, the position of the support mold 160 can be maintained by the first support surface 123. That is, the first support surface 123 can support the support mold 160 so as to maintain the moved position of the support mold 160. Additionally, the movable mold 150 can move in the radial direction by the second pressure surface 122 of the pressure cam 120. When the pressure cam 120 moves further downward, the position of the moving mold 150 can be maintained by the second support surface 124. That is, the second support surface 124 can support the movable mold 150 so as to maintain the moved position of the movable mold 150.

The first support surface 123 extends from the first pressure surface 121 and is provided to be formed in the vertical direction. The second support surface 124 extends from the second pressure surface 122 and is provided to be formed in the vertical direction. The first support surface 123 is formed to face the support mold 160, and the second support surface 124 is formed to face the moving mold 150.

The first support surface 123 is configured to contact the first support surface 163 of the support mold 160, and the second support surface 124 is in contact with the second support surface 154 of the moving mold 150. It is configured to do so.

The lower mold 130 may include a plurality of fixed molds 170.

The plurality of fixed molds 170 may be arranged in a radial direction relative to each of the plurality of movable molds 150. The plurality of fixed molds 170 and the plurality of movable molds 150 may be connected by at least one elastic member 180.

When the pressure cam 120 moves downward, the plurality of moving molds 150 move in the radial direction. At this time, the elastic member 180 disposed between the plurality of fixed molds 170 and the plurality of moving molds 150 is in a compressed state. When the pressure cam 120 moves upward as shown in FIG. 9, the plurality of moving molds 150 move toward the center again as the compression state of the elastic member 180 is released. The elastic member 180 may include a spring cylinder.

Hereinafter, a method of manufacturing a washing machine drum according to an embodiment of the present invention will be described.

Figure 10 is a perspective view of a flat material according to an embodiment of the present invention, and Figure 11 is a view of a rolling flat material according to an embodiment of the present invention. The description will be made with reference to the drawings described above.

As shown in FIGS. 10 and 11, the flat material 31 is formed into a cylindrical portion 34. The flat material 31 may include stainless steel or mild steel plate. A plurality of through holes 34a may first be formed in the flat material 31 through a perforation process. One side and the other side of the flat material 31 are combined to form a cylindrical portion 34 having a hollow portion. The method of joining one side and the other side of the flat material 31 may be accomplished through a welding process or through a fitting joint.

The cylindrical portion 34 molded as shown in FIG. 5 is mounted on the manufacturing device 100. In detail, the cylindrical portion 34 may be mounted between the plurality of core molds 140 and the plurality of support molds 160. The cylindrical portion 34 may be mounted so that its inner surface faces the outer surface of the plurality of core molds 140 and its outer surface faces the inner surface of the plurality of support molds 160. The cylindrical portion 34 can be mounted on the mold so that the joint 34b formed by connecting one side and the other side of the flat material 31 is disposed between the plurality of core molds 140. That is, the cylindrical portion 34 can be arranged so that the joint 34b is not located between the core mold 140 and the support mold 160.

6 to 8, a plurality of expansion parts 36 can be formed on the mounted cylindrical part 34 by the operation of the pressure cam 120. The pressure cam 120 may move downward to pressurize the plurality of moving molds 150 in the radial direction. In this process, the plurality of core molds 140 connected to the plurality of movable molds 150 move in the radial direction together with the plurality of movable molds 150. The inner surface of the cylindrical portion 34 is pressed by the cores 142 of the plurality of core molds 140 to form the expanded portion 36.

The pressure cam 120 may move downward to pressurize the plurality of support molds 160 toward the center. The pressing of the plurality of support molds 160 occurs before the pressing of the plurality of moving molds 150. Through this, the outer surface of the cylindrical part 34 is first supported by the plurality of support molds 160, and then the inner surface of the cylindrical part 34 can be pressed by the plurality of core molds 140. The outer surface of the cylindrical portion 34 is formed to be convex by inserting the cavities 164 of the plurality of support molds 160, and the inner surface of the cylindrical portion 34 is formed by the core 142 of the plurality of core molds 140. It is pressed and formed concave. Through this process, a drum body 32 with a plurality of expansion portions 36 can be formed.

A plurality of support molds 160 simultaneously support the outer surface of the cylindrical portion 34, and a plurality of core molds 140 simultaneously pressurize the inner surface of the cylindrical portion 34. Through this process, a plurality of expansion portions 36 of the drum body 32 can be formed simultaneously on the cylindrical portion 34, thereby improving the roundness of the drum body 32.

When the pressure cam 120 moves upward, the plurality of moving molds 150 and the plurality of core molds 140 move in the central direction, and the plurality of support molds 160 move in the radial direction. By separating the plurality of core molds 140 and the plurality of support molds 160, the drum body 32 can be extracted from the mold.

Hereinafter, a washing machine, a washing machine drum 30 manufacturing apparatus 100, and a method according to another embodiment of the present invention will be described.

In the description, redundant description will be omitted for the same configuration as the configuration described above.

Figure 12 is a perspective view of a washing machine drum body according to another embodiment of the present invention, and Figure 13 is a cross-sectional view of a washing machine drum manufacturing apparatus according to another embodiment of the present invention.

The drum body 32 may include a plurality of pattern portions 35.

A plurality of pattern portions 35 may be formed in the expansion portion 36 . The plurality of pattern portions 35 may be formed to be more concave than the outer surface of the expansion portion 36 . The plurality of pattern portions 35 may include concave portions 35a and convex portions 35b. The concave portion 35a may be formed to be concave compared to the outer surface of the plurality of expansion portions 36. The convex portion 35b may be formed to have the same height as the outer surface of the plurality of expansion portions 36 with respect to the outer surface of the drum 30 body.

The existing drum 30 was manufactured through a process in which protruding or concave shapes were formed on a flat material 31 and then rolled into a cylindrical shape. Plastic deformation occurred due to the protruding or concave shapes formed in the flat material 31, making it difficult to maintain the cylindrical shape when the flat material 31 was rolled into a circle. However, in the present invention, the process of rolling the flat material 31 into the cylindrical portion 34 is performed first, and then a plurality of expansion portions 36 or a plurality of pattern portions 35 are formed on the cylindrical portion 34 at the same time. It becomes possible. Through this, the roundness of the drum 30 can be improved. Additionally, through this process, the height or depth of the plurality of expansion parts 36 and the plurality of pattern parts 35 from the drum body 32 can be increased. Additionally, the internal volume of the drum body 32 can be increased compared to the cylindrical body. Additionally, by increasing the depth of the pattern portion 35, the slope of the surface facing the through hole 34a can be increased, thereby improving dehydration efficiency. Dehydration efficiency can be improved, allowing dehydration to proceed smoothly even in a low RPM environment.

The sizes of the inner diameter, expansion portion 36, and pattern portion 35 of the drum body 32 are not limited. In this embodiment, the inner diameter of the drum body 32 in the portion where the expansion portion 36 is not formed can be formed to be approximately 488 mm, and the expansion portion 36 is approximately 14 mm in the radial direction from the outer surface of the drum body 32. It may protrude. The concave portion of the pattern portion 35 may be formed to be concave by 1.5 mm or more from the outer surface of the expanded portion 36. For example, the concave portion of the pattern portion 35 may be formed to be concave by 6 mm from the outer surface of the expanded portion 36 toward the center of the drum body 32. Although not specifically shown in the drawings, a protrusion may be formed in the extension portion 36. This is called a protrusion of the pattern portion 35. The protrusion of the pattern portion 35 may be formed to be convex by 1.5 mm or more from the outer surface of the extension portion 36. For example, the protrusion of the pattern portion 35 may be formed to be convex by 6 mm in the radial direction of the drum body 32 from the outer surface of the extension portion 36.

Conventionally, when forming a drum, an expansion part or a pattern part is first formed on a plate-shaped drum body, and then the plate-shaped drum body is bent to form a cylindrical shape. According to this manufacturing method, it was difficult to manufacture the extension so that it protrudes from the drum body by more than 10 mm. This is because when the depth of the expansion part exceeds 10 mm, the drum body becomes deformed and rolling becomes difficult. In addition, conventionally, when forming pattern parts such as protrusions or concave parts on the extension, it was difficult to form them convexly or concavely by more than 1.5 mm. As with the formation of the expansion part, as the depth of the pattern part increases, deformation occurs when rolling the drum body.

According to the idea of the present invention, after rolling the drum body 32 into a cylindrical shape, the expansion portion 36 and the pattern portion 35 are formed, so that the depth of the expansion portion 36 can be provided to be 10 mm or more, The depth of the pattern portion 35 may also be 1.5 mm or more. More specifically, the depth of the expansion part 36 may be 14 mm, and the depth of the pattern part 35 may be 6 mm. In this way, the drainage performance of the drum body 32 can be improved by increasing the depth of the expansion portion 36 and the pattern portion 35.

Hereinafter, the manufacturing apparatus 100 and manufacturing method of the washing machine drum 30 according to this embodiment will be described.

The plurality of core molds 140 may include pattern grooves 144 formed on the outer surface of the core 142.

The plurality of support molds 160 may include pattern protrusions 166 formed on the concave surface 165 forming the cavity 164. The pattern protrusion 166 may be configured to correspond to the pattern groove 144 of the core mold 140.

The outer surface of the cylindrical portion 34 is formed to be convex by inserting the cavities 164 of the plurality of support molds 160, and the inner surface of the cylindrical portion 34 is formed by the core 142 of the plurality of core molds 140. It is pressed and formed concave. Through this process, a drum body 32 with a plurality of expansion portions 36 can be formed.

The pattern portion 35 may be formed together with the plurality of expansion portions 36 being formed. The step of forming the plurality of expansion portions 36 and the step of forming the pattern portion 35 may be performed together. That is, a plurality of expansion portions 36 are formed in the cylindrical portion 34 by the core 142 and the cavity 164, and a plurality of expansion portions 36 are formed by the pattern groove 144 and the pattern protrusion 166. A plurality of pattern portions 35 may be formed.

In the above, specific embodiments are shown and described. However, it is not limited to the above-described 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. .

1: Washing machine 10: Cabinet
20: Tub 30: Drum
32: drum body 34: cylindrical part
36: expansion part 40: drive motor
50: door
100: Manufacturing device 110: Upper mold
120: Pressure cam 130: Lower mold
140: core mold 150: moving mold
160: Support mold 170: Fixed mold
180: elastic member

Claims (27)

In the drum manufacturing apparatus for manufacturing a drum body having a cylindrical portion and a plurality of expansion portions protruding radially from the cylindrical portion,
An upper mold having a plurality of pressure cams that move up and down;
a lower mold fitted with the upper mold; Including,
The lower mold is,
a plurality of core molds arranged radially so that their outer sides face the inner surface of the cylindrical portion;
A plurality of movable molds arranged to be radially spaced from each of the plurality of core molds and configured to be movable in the radial direction by being respectively pressed by the plurality of pressure cams, and connected to the plurality of core molds to form the plurality of molds. It includes a plurality of moving molds configured to move together with the core mold,
A drum manufacturing apparatus wherein the plurality of core molds press the inner surface of the cylindrical portion by moving the plurality of moving molds to form the plurality of expansion portions. According to claim 1,
The lower mold is,
A drum manufacturing apparatus further comprising: a plurality of support molds disposed between the plurality of moving molds and the plurality of core molds to support an outer surface of the cylindrical portion. According to claim 2,
The plurality of core molds are,
It includes a radially convex core to form the inner surface of the expansion portion,
The plurality of support molds are,
A drum manufacturing apparatus comprising: a cavity forming an outer surface of the expansion portion and being concavely formed to correspond to the core. According to claim 2,
The pressure cam is,
a first pressing surface that presses the plurality of support molds in a central direction;
A drum manufacturing apparatus comprising a second pressing surface that presses the plurality of moving molds in a radial direction. According to claim 4,
The first pressure surface is,
It is formed to be inclined toward the center so as to convert the downward movement of the pressure cam into movement toward the center of the plurality of support molds,
The second pressure surface is,
A drum manufacturing device that is inclined toward the radial direction to convert the downward movement of the pressure cam into radial movement of the plurality of moving molds. According to claim 4,
The drum manufacturing apparatus wherein the first pressure surface is disposed lower than the second pressure surface so that the plurality of support molds are pressed by the pressure cam before the plurality of moving molds. According to claim 1,
A drum manufacturing device wherein the plurality of moving molds are configured to be simultaneously pressed by the plurality of pressing cams. According to claim 1,
A drum manufacturing apparatus configured to form the plurality of expansion parts simultaneously. According to claim 1,
The plurality of moving molds, the plurality of core molds, and the plurality of support molds,
A drum manufacturing device comprising three moving molds, three core molds, and three support molds, each spaced apart at 120-degree intervals. According to claim 3,
The plurality of core molds are,
It further includes a pattern groove formed concavely on the outer surface of the core,
The plurality of support molds are,
A drum manufacturing apparatus further comprising a pattern protrusion corresponding to the pattern groove and protruding from a concave surface forming the cavity. According to claim 3,
The lower mold is,
a plurality of fixed molds disposed radially outward from the plurality of moving molds;
It further includes a spring cylinder disposed between the plurality of fixed molds and the plurality of movable molds,
A drum manufacturing apparatus wherein when the pressure by the pressure cam is released, the plurality of moving molds and the plurality of core molds return to the center direction. It has a plurality of movable molds that are movable in the radial direction by a pressurizing cam, and a plurality of core molds that are disposed in a more central direction than the plurality of movable molds and are movable in the radial direction together with the plurality of movable molds. In the method of manufacturing a drum using a manufacturing device,
Forming a flat material into a cylindrical cylindrical part;
A method of manufacturing a drum comprising: moving the plurality of movable molds in the radial direction to press the inner surface of the cylindrical portion with the plurality of core molds to form a plurality of expansion portions protruding from the cylindrical portion in the radial direction. According to claim 12,
The manufacturing device is,
It further includes a plurality of support molds disposed between the plurality of moving molds and the plurality of core molds,
The step of forming the plurality of extensions includes:
A method of manufacturing a drum comprising: supporting the outer surface of the cylindrical portion by the plurality of support molds. According to claim 13,
The press cam is configured to press the plurality of support molds in the center direction with a first pressure surface on one side and press the plurality of moving molds in the radial direction with a second pressure surface on the other side. According to claim 13,
A method of manufacturing a drum in which the plurality of support molds are pressed by the pressure cam before the plurality of moving molds. According to claim 12,
The plurality of core molds are,
It includes a pattern groove formed concavely on one surface,
The plurality of support molds are,
It includes a pattern protrusion protruding toward the outer surface of the cylindrical portion to correspond to the pattern groove,
A method of manufacturing a drum further comprising forming a concave pattern toward the center of the plurality of expansion portions using the pattern grooves and the pattern protrusions. According to claim 16,
A method of manufacturing a drum in which the forming of the plurality of expansion parts and the forming of the pattern are performed together. According to claim 12,
A method of manufacturing a drum in which the plurality of expansion parts are simultaneously formed by the plurality of core molds. According to claim 12,
The flat material is,
A method of manufacturing a drum including at least one of stainless steel and mild steel plate. According to claim 12,
The flat material is,
A method of manufacturing a drum including a plurality of through holes. delete delete delete delete delete delete delete

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