KR20220104546A - Drum manufacturing method for laundry treating apparatus - Google Patents

Abstract

The present invention relates to a method for manufacturing a drum for a laundry treating apparatus and, more specifically, to a method for manufacturing a drum for a laundry treating apparatus, which comprises a rolling step for rolling a metal sheet into a hollow cylindrical shape, a welding step for welding both ends of the metal sheet to form a drum center, and a molding step for processing reduced tube portions on both ends of the drum center. Therefore, a drum front and a drum rear do not need to be manufactured separately, separate molds for manufacturing a drum front and a drum rear are not required accordingly, and the overall manufacturing cost can be reduced.

Description

Drum manufacturing method for laundry treating apparatus

The present invention relates to a method for manufacturing a drum for a laundry treatment apparatus, and more particularly, it is not necessary to separately manufacture the drum front and the drum rear, and accordingly, an individual mold for manufacturing the drum front and the drum rear is unnecessary, and the overall manufacturing cost It relates to a method for manufacturing a drum for a laundry treatment device that can reduce the

Recently, air pollution caused by pollutants such as fine dust, ultra-fine dust, and yellow sand has emerged as a serious problem, and such air pollution increases the frequency of washing laundry by easily contaminating the clothes people wear in their daily lives. At the same time, it causes a problem of making it difficult to naturally dry the washed laundry in the air.

Accordingly, in most households, a washing machine that can easily and conveniently wash clothes, bedding, etc., a dryer that can be dried easily and conveniently by applying hot air to the washed laundry, or a washer dryer equipped with both washing and drying functions It is equipped with the same laundry treatment device and is being used.

In general, a laundry treatment apparatus includes a drum in which laundry is accommodated for washing or drying, and the drum is generally formed in a cylindrical shape and installed inside the main body of the laundry treatment apparatus.

In relation to this conventional method for manufacturing a drum for a laundry treatment apparatus, there is one disclosed in Korean Patent No. 10-0657465.

A conventional method for manufacturing a drum for a laundry treatment apparatus, as shown in FIG. 1, includes a hole forming step of forming a plurality of holes in a metal plate, a first bending step of bending both ends of the metal plate with holes in the opposite direction, A rolling step of rolling the other than the bent both ends into a hollow cylinder and attaching one bent end to the other bent end, and curling the jammed one bent end and the other bent end to the hollow cylinder, as well as bending one bent end and the other side A curling/seaming step of seaming the ends with a hollow cylinder; a second bending step of bending the curled/seamed one bent end, the other bent end, and the front and rear ends of the hollow cylinder; A front drum coupling step of welding the hollow cylinder after curling the periphery of the front drum and the front bending part rearward, and the periphery of the rear drum surrounding the rear bending part of the center drum, and the rear and a rear drum coupling step of curling the periphery of the drum and the rear end bent portion forward and welding the hollow cylinder. In this case, the inlet side of the front drum is generally hemmed so that the edges are overlapped and formed in a folded form, thereby reinforcing strength.

However, in this conventional method of manufacturing a drum for a laundry treatment device, since the center drum, the front drum, and the back (rear) drum must be separately manufactured, a mold for manufacturing the center drum, a mold for manufacturing the front drum, and the back (rear) drum are manufactured. There is a problem in that a mold is required individually for this purpose.

In addition, in the conventional method for manufacturing a drum for a laundry treatment apparatus, operations such as curling, seaming, and welding must be performed in order to combine the separately provided center drum, the front drum, and the back (rear) drum with each other. There is a problem that each facility is required to perform.

In addition, the conventional method for manufacturing a drum for a laundry treatment apparatus has a problem in that the manufacturing cost is very high due to the separate manufacturing of the center drum, the front drum, and the back (rear) drum and combining them with each other.

In addition, in the conventional method of manufacturing a drum for a laundry treatment apparatus, a hemming treatment must be performed to reinforce the strength of the front drum inlet side, and when such a hemming treatment is performed, the front drum inlet end end may be torn. .

US 10-0657465 B1

The present invention has been devised to solve the above problem, and there is no need to separately manufacture the drum front and the drum rear. An object of the present invention is to provide a method for manufacturing a drum for a laundry treatment apparatus.

A method for manufacturing a drum for a laundry treatment apparatus of the present invention for solving the above problems includes a rolling step of rolling a metal sheet into a hollow cylindrical shape; a welding step of welding both ends of the metal sheet to form a drum center; and , A forming step of processing the shaft pipe portion on both ends of the drum center; characterized in that it comprises a.

In addition, in the forming step, it is characterized in that the axial tube portion is processed while processing the bent portion at both ends of the drum center.

In addition, in the forming step, it is characterized in that the bent portion and the shaft tube portion are processed so that the bent portion is located in the shaft tube portion.

In addition, the bent portion is characterized in that it supports the processing of the shaft portion.

In addition, after the forming step, it characterized in that it further comprises an attachment step of attaching a reinforcing piece to a welding line by welding both ends of the metal sheet.

In addition, in the attaching step, the reinforcing piece is welded to the shaft portion in a shape orthogonal to the welding line.

The method for manufacturing a drum for a laundry treatment apparatus according to the present invention has the following advantages.

In the method for manufacturing a drum for a laundry treatment apparatus according to the present invention, there is no need to separately manufacture the drum front and the drum rear by forming shaft pipe portions serving as the drum front and the drum rear at both ends of the drum center. It has the advantage of not needing a separate mold for manufacturing.

In addition, the method for manufacturing a drum for a laundry treatment apparatus according to the present invention has an advantage in that a separate coupling operation such as curling, seaming, and welding is not required because the shaft tube portion is formed in the drum center itself.

In addition, the method for manufacturing a drum for a laundry treatment apparatus according to the present invention has the advantage that the overall manufacturing cost can be reduced.

In addition, the method for manufacturing a drum for a laundry treatment apparatus according to the present invention can prevent tearing of the shaft tube portion that may occur during hemming treatment by forming a bent portion of a simple structure instead of a hemming treatment to reinforce the strength of the shaft tube portion. There are advantages.

In addition, the method for manufacturing a drum for a laundry treatment apparatus according to the present invention has an advantage in that a reinforcing piece is attached to a welding line by welding a metal sheet, thereby preventing the welding line from bursting due to rotation, vibration, etc. of the drum center.

In addition, the method for manufacturing a drum for a laundry treatment apparatus according to the present invention has an advantage in that the reinforcing piece is welded to the shaft pipe portion in a shape orthogonal to the welding line, thereby preventing the welding line from bursting and simultaneously reinforcing the strength of the shaft pipe portion.

1 is a flow chart showing a conventional method of manufacturing a drum for a laundry treatment apparatus.
Figure 2 is a front perspective view showing a drum for a laundry treatment apparatus according to an embodiment of the present invention.
3 is a plan view schematically illustrating a state in which a metal sheet is prepared in a method for manufacturing a drum for a laundry treatment apparatus according to an embodiment of the present invention.
4 is a plan view schematically illustrating a state in which the metal sheet is rolled into a hollow cylindrical shape in FIG. 3 .
5 is a plan view schematically illustrating a state in which a drum center is formed by welding both ends of the metal sheet rolled into a hollow cylindrical shape in FIG. 4 .
6 is a plan view schematically illustrating a state in which bent portions and shaft tube portions are formed at both ends of the drum center in FIG. 5 .
7 is a plan view schematically illustrating a state in which the reinforcing piece is attached to the welding line by welding the reinforcing piece to the shaft pipe portion in FIG. 6 .
8 is a flowchart illustrating a method of manufacturing a drum for a laundry treatment apparatus according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

For reference, among the components of the present invention to be described below, for the same components as in the prior art, reference will be made to the above-described prior art, and a separate detailed description thereof will be omitted.

The terminology used herein is for the purpose of referring to specific embodiments only, and is not intended to limit the present invention. As used herein, singular forms also include plural forms unless the phrases clearly indicate the opposite. The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and other specific characteristic, region, integer, step, operation, element, component, and/or group. It does not exclude the existence or addition of

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or in contact with the other component, but it is understood that other components may exist in between. it should be

Figure 2 is a front perspective view showing a drum for a laundry treatment apparatus according to an embodiment of the present invention, Figure 3 is a schematic view of a state in which a metal sheet is prepared in the drum manufacturing method for a laundry treatment apparatus according to an embodiment of the present invention 4 is a plan view schematically illustrating a state in which the metal sheet is rolled into a hollow cylindrical shape in FIG. 3, and FIG. 5 is a drum center by welding both ends of the metal sheet rolled into a hollow cylindrical shape in FIG. It is a plan view schematically showing a state, and FIG. 6 is a schematic plan view showing a state in which bent parts and shaft pipe parts are formed at both ends of the drum center in FIG. It is a plan view schematically showing a state in which a reinforcing piece is attached to a welding line, and FIG. 8 is a flowchart illustrating a method of manufacturing a drum for a laundry treatment apparatus according to an embodiment of the present invention.

For reference, the welding line (L) shown in FIGS. 5 to 7 is actually the same as the welding line (L) shown by the line in FIG. It is marked with dotted hatching.

2 to 7 , the drum for a laundry treatment apparatus according to an embodiment of the present invention may include a drum center 100 .

The drum center 100 may be formed in a cylindrical shape having a hollow 101 penetrating in the front-rear direction.

The drum center 100 is a configuration in which laundry that needs washing or drying is accommodated. After rolling as in, by welding the both ends 11 of the abutting metal sheet 10 as a joint, that is, by butt welding, it can be formed into a cylindrical shape having a hollow 101 as in FIG. 5 .

At this time, the metal sheet 10 may be formed into a cylindrical drum center 100 by welding both ends 11 by a laser welding machine.

In the drum center 100 , a welding line L according to the welding of both ends 11 of the metal sheet 10 may be formed to be elongated along the axial direction of the drum center 100 .

The drum center 100 may be installed inside the main body (not shown) of the laundry treatment apparatus, which is usually called a cabinet, and a belt (not shown) mounted on the belt mounting units 105 and 107, which will be described later, includes a motor (not shown). may be rotatable as operated by

On the other hand, the drum center 100 may include a shaft portion (110).

As shown in FIGS. 2 and 6 , the shaft tube portion 110 is a portion of the drum center 100 having a smaller diameter, and may be formed at both ends of the drum center 100 .

More specifically, the shaft tube part 110 may be formed in a shape symmetrical to the front end (front side in FIG. 2) and the rear end (rear side in FIG. 2) of the drum center 100, respectively, and the drum center 100 Compared to the center of the drum center 100 between the front end and the rear end of the front end and the rear end of the drum center 100 may be formed by processing the shaft pipe by a molding machine so that the diameter is smaller, respectively.

At this time, the shaft part 110 may be formed from a point on the front side of the outer peripheral surface of the drum center 100 to the end of the front side of the drum center 100, and at a point on the rear side of the outer peripheral surface of the drum center 100, the drum center ( 100) may be formed up to the rear end.

The shaft pipe part 110 is integrally formed at both ends of the drum center 100 formed by a single metal sheet 10 so that the shaft pipe part 110 itself of each of the front and rear ends is the drum front and the drum rear in the conventional drum structure. Since it can play a role, the drum structure for a laundry treatment apparatus according to an embodiment of the present invention does not need to separately manufacture the drum front and the drum rear, and accordingly, separate molds for manufacturing the drum front and the drum rear This may have the advantage that it is unnecessary.

In addition, in the drum structure for a laundry treatment apparatus according to an embodiment of the present invention, since the shaft pipe part 110 is formed in the drum center 100 itself formed by a single metal sheet 10, curling, seaming ), there may be an advantage that it is not necessary to couple the drum front and the drum rear to the drum center 100 through a separate coupling operation such as welding.

The open surface of the shaft part 110 formed at the front end of the drum center 100 may be an entrance through which laundry can be put into or taken out of the drum center 100 when washing or drying laundry. .

Meanwhile, a bent portion 103 may be formed in the shaft tube portion 110 .

As shown in FIGS. 2 and 6 , the bent portion 103 is a configuration formed to reinforce the overall strength of the shaft pipe part 110 , and is a front end side shaft pipe part 110 and a rear end side shaft pipe part 110 . Each is formed in a shape symmetrical to each other, and can replace a separate hemming treatment for strength reinforcement.

The bent portion 103 may be continuously formed over the entire circumference of the shaft tube portion 110 while having an arc-shaped cross-sectional shape, and may be formed in a circular ring shape when viewed as a whole.

The bent portion 103 may be formed at both ends of the drum center 100 by a molding machine when the shaft tube portion 110 is formed at both ends of the drum center 100 as shown in FIG. 6 .

That is, on the front circumference of each of the front and rear ends of the drum center 100, a bent portion 103 and a axial tube portion 110 may be formed together as shown in FIG. 6, and at this time, the axial tube portion 110 is a bent portion ( 103 may be formed to be positioned on the shaft tube portion 110 .

The bent part 103 positioned on the shaft pipe part 110 is spaced apart from the flange-shaped edge part 109 formed at the end of the shaft pipe part 110 .

The bent portion 103 and the shaft tube portion 110 may be molded by a molding machine capable of both processing the bent portion 103 and the processing of the shaft tube portion 110 .

In addition to reinforcing the strength of the shaft pipe part 110, the bent part 103 becomes a structure that the roller of the molding machine can hold so as to support the shaft pipe part when the shaft pipe part 110 is processed by the molding machine. It can serve to support the processing of (110).

The bent portion 103 may be formed in a concave shape with respect to the outer circumferential surface of the shaft tube portion 110 and may be formed in a convex shape with respect to the inner circumferential surface of the shaft tube portion 110 .

That is, the bent portion 103 may have a concave shape when viewed from the outside of the shaft tube portion 110 , may have a convex shape when viewed from the inside of the shaft tube portion 110 , and the shaft tube portion 110 . It is formed to protrude radially inwardly.

The bent portion 103 may include a concave surface 103b that is an outer surface directly connected to the outer circumferential surface of the axial tube portion 110 and a convex surface 103c that is an inner surface directly connected to the inner circumferential surface of the axial tube portion 110, A concave groove 103a that becomes deeper toward the center of the bottom may be formed inside the concave surface 103b.

The concave surface 103b and the convex surface 103c may be formed as an arc-shaped curved surface in which the width of the bent portion 103 in the axial direction (front-to-back direction) increases toward the radially outer side of the bent portion 103 , and the concave surface 103b ) and the connecting portion of the outer circumferential surface of the shaft tube portion 110 may be formed to be round, and the connection portion between the convex surface 103c and the inner circumferential surface of the shaft tube portion 110 may also be formed to be round.

That is, the bent part 103 may be formed so that the connection part with itself and the shaft pipe part 110 is not sharp, so that when a load due to rotation or vibration of the drum center 100 is applied to the bent part 103, the load is reduced. It can be evenly distributed throughout, and accordingly, it is possible to prevent cracks from occurring in a specific part in advance.

A plurality of bent portions 103 may be formed in the axial tube portion 110 , and the plurality of axial tube portions 110 may be spaced apart from each other with a portion of the axial tube portion 110 interposed therebetween.

A portion of the shaft tube portion 110 may be interposed between two adjacent curved portions 103 among the plurality of curved portions 103 to be connected to the two adjacent curved portions 103 , and the plurality of curved portions 103 and two adjacent to each other may be connected. A portion of the shaft tube portion 110 interposed between the bent portions 103 of the dog is formed to be convex when viewed as a whole, and may be provided to have a wavy shape such as a wavy shape.

The bent part 103 formed in the shaft pipe part 110 is a shaft pipe part that may occur when the shaft pipe part 110 is hemmed by reinforcing the strength of the shaft pipe part 110 without a separate hemming process. It is possible to prevent tearing of (110) and splaying of the welding line (L).

Meanwhile, during processing of the bent portion 103 , the belt mounting portions 105 and 107 may be formed together on the outer circumferential surface of the drum center 100 .

As shown in FIGS. 2 and 6 , the belt mounting parts 105 and 107 are parts on which a belt (not shown) for rotating the drum center 100 is mounted, and are processed together when the bending part 103 is processed. can be

The belt mounting portions 105 and 107 may be formed on the outer peripheral surface of the drum center 100 in the form of a rectangular groove corresponding to the cross-section of the belt (not shown), and a plurality of spaced apart from the drum center 100 may be formed. .

The plurality of belt mounting portions 105 and 107 may have different widths (front-rear width) in the axial direction of the drum center 100 corresponding to the mounted belt (not shown), or may be formed the same. have.

In the present embodiment, one belt holder 105, 107 may be continuously formed along the entire circumference of the outer circumferential surface of the drum center 100 in the central portion of the drum center 100, and the drum center at the front and rear sides spaced apart from each other. One by one may be continuously formed along the entire circumference of the outer circumferential surface of the drum center 100, and the belt holder 105 formed in the central part of the drum center 100 has a larger front and rear width than the two belt holder 107 spaced therefrom. can

Accordingly, a belt (not shown) having a larger front and rear width than the two belt mounting units 107 spaced apart therefrom may be mounted on the belt holder 105 formed in the central portion of the drum center 100 .

On the other hand, the reinforcing piece 120 may be attached to the welding line (L) formed in the drum center (100).

2 and 7, the reinforcing piece 120 is a rectangular metal piece, spanning the welding line (L) to prevent bursting of the welding line (L) due to rotation, vibration, etc. of the drum center (100). can be attached to the

The reinforcing piece 120 may be attached to the shaft pipe part 110 formed in the drum center 100 through welding.

More specifically, the reinforcing piece 120 is disposed on the outer circumferential surface of the shaft pipe portion 110 so as to be interposed between the rim portion 109 and the bent portion 103 , and the longitudinal direction of the reinforcing piece 120 is orthogonal to the welding line (L). It can be attached to the shaft tube portion 110 by being welded to the shaft tube portion 110 while spanning the welding line (L).

At this time, the reinforcing piece 120 may be spot-welded at a plurality of welding points (S) through a spot welding machine.

Accordingly, the reinforcing piece 120 can prevent bursting of the welding line L due to rotation, vibration, etc. of the drum center 100, and reinforce the strength of the shaft pipe part 110 together with the bent part 103. be able to

Hereinafter, a method of manufacturing a drum for a laundry treatment apparatus according to an embodiment of the present invention will be described with reference to the drawings.

3 to 8, the method for manufacturing a drum for a laundry treatment apparatus according to an embodiment of the present invention includes a rolling step (S10) of rolling the metal sheet 10 into a hollow cylindrical shape; and, the metal sheet ( 10) A welding step (S20) of forming the drum center 100 by welding both ends 11 of the; can do.

In the method for manufacturing a drum for a laundry treatment apparatus according to an embodiment of the present invention, first, a rolling step (S10) may be performed.

3, 4 and, the rolling step (S10) may include preparing a metal sheet 10 provided in a rectangular shape using a rolling machine and rolling it into a hollow cylindrical shape.

In this way, the metal sheet 10 rolled in the rolling step (S10) may be formed in a hollow cylindrical shape with both ends 11 in contact with each other to form a joint.

That is, in the rolling step (S10), the metal sheet 10 provided in a rectangular shape shown in FIG. 3 may be formed of a hollow cylindrical metal sheet 10 in which both ends 11 shown in FIG. 4 are in contact.

Meanwhile, after the rolling step (S10), the welding step (S20) may be performed.

4, 5 and 8, the welding step (S20) is abutting both ends 11 of the metal sheet 10 rolled into a hollow cylindrical shape through a rolling step (S10) using a laser welding machine. It may include forming the drum center 100 by welding.

In this way, the metal sheet 10 welded in the welding step (S20) may be combined along the welding line (L) to form a cylindrical drum center 100 having a hollow, in this case, the welding line (L) is the drum It may be formed in a straight line on the outer circumferential surface of the drum center 100 along the axial direction of the center 100 .

That is, in the welding step (S20), the hollow cylindrical metal sheet 10 in which both ends 11 shown in FIG. 4 are abutted may be formed as a cylindrical drum center 100 having a hollow shown in FIG.

Meanwhile, after the welding step (S20), the forming step (S30) may be performed.

As shown in Figures 5, 6 and 8, the forming step (S30) may include processing the integral shaft portion 110 at both ends of the cylindrical drum center 100 having a hollow using a molding machine. have.

In addition, the forming step (S30) may further include processing the bent portion 103 together with the shaft tube portion 110 at both ends of the hollow cylindrical drum center 100 using a molding machine.

More specifically, in the forming step (S30), after inserting the hollow of the drum center 100 into the forming machine, the bending portion 103 is processed so as to have a concave cross section in the form of an arc over the entire circumference of the front end of the drum center 100 and In addition, it is possible to process the shaft pipe portion 110 having a smaller diameter than the diameter of the drum center 100 at the front end of the drum center 100 including the processing position of the bent portion 103, and then the drum center 100 After inserting the hollow of the drum center 100 into the molding machine in an inverted state, the bending portion 103 is processed to have a concave cross section in the form of an arc over the entire circumference of the rear end of the drum center 100, and the bending portion 103 It is possible to process the shaft tube portion 110 having a smaller diameter than the diameter of the drum center 100 at the rear end of the drum center 100 including the machining position of the.

Accordingly, the bent portion 103 and the shaft tube portion 110 may be formed in a symmetrical form at the front end and the rear end of the drum center 100 , and the bent portion 103 may be located on the shaft tube portion 110 . It can be molded to

When processing the bent portion 103 on the outer circumferential surface of the drum center 100, the belt mounting portions 105 and 107 may be machined together.

The front end and rear end of the drum center 100 , that is, the front end side shaft tube portion 110 and the rear end side shaft tube portion 110 of the drum center 100 are reinforced by the formation of the bent portion 103 , so the strength is reinforced separately. Strength reinforcement through the hemming treatment is unnecessary.

In addition, in the forming step (S30), the bending portion 103 serves as a structure that can be held by the roller of the molding machine so as to support the shaft tube portion during the processing of the shaft tube portion 110, so that the shaft tube portion 110 processing is performed at the bending portion ( 103) can play a supporting role.

In this way, the drum center 100 formed in the forming step (S30) may be a drum center 100 in which a bent portion 103 and a shaft tube portion 110 are processed at each of the front end and the rear end.

That is, in the forming step (S30), the cylindrical drum center 100 having a hollow shown in FIG. 5 is a drum center 100 having bent parts 103 and a shaft pipe part 110 formed at both ends shown in FIG. 6 ) can be formed with

Meanwhile, after the forming step (S30), the attaching step (S40) may be performed.

6 to 8, the attaching step (S40) is a rectangular shape on the welding line (L) of the drum center 100 in which bent portions 103 and axial pipe portions 110 are formed at both ends using a spot welding machine. It may include attaching the reinforcing piece 120 .

More specifically, in the attaching step (S40), the reinforcement piece 120 is disposed on the outer peripheral surface of the shaft pipe part 110 so as to be interposed between the edge part 109 and the bent part 103 formed at the end of the drum center 100, and at the same time, reinforcement After disposing the reinforcing piece 120 in a shape perpendicular to the welding line L in the longitudinal direction of the piece 120 , a plurality of welding points S are formed on the reinforcing piece 120 and the shaft pipe part 110 . The reinforcing piece 120 may be attached to the shaft pipe part 110 by spot welding.

Since the reinforcing piece 120 is attached by spot welding to the shaft pipe part 110 in a state spanning the welding line (L), the welding line (L) caused by the rotation and vibration of the drum center 100 generated in the washing or drying process It is possible to prevent bursting, and the effect of reinforcing the strength of the shaft tube part 110 itself may occur.

In this way, the method for manufacturing a drum for a laundry treatment apparatus according to an embodiment of the present invention can be completed by attaching the reinforcing piece 120 in the attaching step (S40).

That is, in the attachment step (S40), the drum center 100 having bent portions 103 and shaft tube portions 110 formed at both ends shown in FIG. 6 spans the welding line L shown in FIG. It may be formed as a drum center 100 to which the reinforcing piece 120 is attached to the part 110 .

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the following by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equivalent scope of the claims to be described.

10: metal sheet 11: both ends of the metal sheet
100: drum center 101: hollow
103: bent portion 103a: groove
103b: concave surface 103c: convex surface
105, 107: belt holding part 109: edge part
110: shaft part 120: reinforcing piece
L: welding line S: welding point

Claims (6)

A rolling step of rolling the metal sheet into a hollow cylinder;
a welding step of welding both ends of the metal sheet to form a drum center;
A method of manufacturing a drum for a laundry treatment device, comprising: a forming step of processing the shaft pipe at both ends of the drum center.
The method according to claim 1,
In the forming step,
A method of manufacturing a drum for a laundry treatment apparatus, characterized in that the shaft pipe part is processed while processing the bent part at both ends of the drum center.
3. The method according to claim 2,
In the forming step,
A drum manufacturing method for a laundry treatment apparatus, characterized in that the bending portion and the shaft tube portion are processed so that the bent portion is located on the shaft tube portion.
3. The method according to claim 2,
The bending portion is a drum manufacturing method for a laundry treatment apparatus, characterized in that supporting the processing of the shaft tube portion.
3. The method according to claim 2,
After the forming step,
The method of manufacturing a drum for a laundry treatment device, characterized in that it further comprises an attachment step of attaching a reinforcing piece to a welding line by welding both ends of the metal sheet.
6. The method of claim 5,
In the attaching step,
The drum structure for a laundry treatment apparatus, characterized in that the reinforcing piece is welded to the shaft pipe portion in a shape perpendicular to the welding line.

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