JP2922870B2 - Iron plate bending apparatus and method for outer box of refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for manufacturing a steel plate for an outer box of a refrigerator, and more particularly, to a method of bending a lower end of both side plates of a refrigerator box to freely form a clamp for forming a bending line. TECHNICAL FIELD The present invention relates to an iron plate bending apparatus for an outer box of a refrigerator and a manufacturing method for preventing interference by grooves formed on both front and rear sides by making it possible to adjust the height.

[0002]

2. Description of the Related Art Generally, a refrigerator has a triple structure for heat insulation and heat retention in a refrigerator. That is, the outer box and the inner box, which are connected to each other so that a closed space is formed therebetween, and a heat insulating material filled therebetween,
The inner box of plastic material is injection molded and the insulation foams between the inner and outer boxes. The outer box is composed of an upper plate, left and right side plates, a back plate, and a bottom plate. The upper plate and the left and right side plates are formed by bending one plate into a “U” shape, and the back plate and the bottom plate are formed of these. Is combined with FIG. 12 is a diagram showing a bending structure of the lower end portions of the left and right side plates of such a conventional iron plate for an outer box, and FIG. 13 is a side view of the clamp shown in FIG. As shown in FIGS. 12 and 13, both ends of the outer case iron plate 1 having the grooves 1a and 1b opened downward at both ends are bent so that the grooves 1a are opened downward at the time of the "U" bending. By doing so, protrusions (not shown) formed to protrude upward from both edges of the bottom plate (not shown) can be inserted and coupled. In other words, in the conventional outer box bending apparatus, the clamper 3 is installed above the base 2 so as to be able to move up and down, and the bender 4 is installed below the base 2 so as to be rotatable outward and upward. And the clamper 3 descends to fix it, and the bender 4 rotates counterclockwise to bend the lower end portion of the outer box iron plate 1 in an "L" shape to form a groove formed at the end portion. 1a is opened on both sides.

[0003] On the other hand, the supplied outer box iron plate 1 is formed with a connecting portion 1b for connecting to an inner box (not shown) and a back plate (not shown). A groove 3a into which the coupling portion 1b is inserted is formed in each of the clampers 3 opposed to this. Such a clamp 3 is divided into front and rear portions, and the width of the clamp portion provided at the rear is changed according to the width of the supplied outer box iron plate 1 so that the width is adjusted.

[0004] However, in such a conventional outer box iron plate bending apparatus, when bending an outer box iron plate having a different width, interference is caused by a joint formed at the front and rear ends of the outer box iron plate. Therefore, there is a problem that the operation is difficult and troublesome because the clamp should be replaced with a clamp corresponding to the width of the outer box. In order to solve this, it has been proposed to form two grooves in the rear clamp. However, this is also limited to two applicable specifications, and also bends an outer case iron plate having a third width. Therefore, there is a problem that the rear clamp must be replaced. When a clamp having two grooves is used, there is a problem that bending occurs at a bending portion of an iron plate that is bent along a cross section of the clamp. In particular, there is a problem that the bending process cannot be automated because a structure for automatically replacing the clamp is not provided.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a refrigerator which can automatically bend various types of iron plates for outer boxes having various widths. It is an object of the present invention to provide an iron box bending apparatus and a bending method for an outer box.

[0006]

In order to achieve the above object, an iron box bending apparatus for an outer box of a refrigerator according to the present invention comprises: a base for supporting an iron box for an outer box having joints on front and rear surfaces; A clamp comprising a plurality of dies, which are provided so as to be able to move up and down and are arranged in the width direction of the outer box iron plate, and adjusting the width direction positions of the plurality of dies to adjust the width of the clamp to the outer box. Adjusting means for adjusting according to the iron plate; and a bender rotatably provided below the iron plate for the outer box facing the clamp, and bending the end of the iron plate for the outer box using the clamp as an internal contact. And

In addition, the method of bending an outer box iron plate of a refrigerator according to the present invention includes the steps of positioning an outer box iron plate having coupling portions at both ends in a width direction at a bending position, and a clamp provided at a predetermined interval. Adjusting the width of the outer box iron plate according to the width of the outer box iron plate, crimping the clamp to the outer box iron plate, and using a bender to clamp the outer box iron plate as an inner contact. Rotating both sides to bend the outer box iron plate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The main body of the refrigerator has a triple structure of an outer box, an inner box, and a heat insulating material filled therebetween. The inner box is made by plastic injection molding, the outer box is formed by joining a number of iron plates, and after the inner box is inserted and joined inside the outer box, the foaming liquid foams between them to form a heat insulating material I do. FIG. 1 is an exploded perspective view of the outer box. As shown in FIG. 1, the outer box 10 includes an upper plate 11, left and right side plates 12 and 13, a back plate 14, and a bottom plate 15 integrally formed. These are connected to each other, but grooves 12c and 13c are formed at the lower ends of both side plates 12 and 13 and open downward. Opposite sides of the bottom plate 15 are formed with protrusions 15a protruding upward. The bottom plate 1 is inserted into the grooves 12c and 13c.
5 is combined. Then, the upper plate 11 and both side plates 12 and 13
Grooves 13b, 15b are formed at the rear end of the bottom plate 15 and at the upper end of the rear surface of the bottom plate 15. Grooves 13b, 15b are formed at the edge of the back plate 14 at the edge of the rear plate 14.
, The back plate 14 is connected. On the other hand, connecting portions 12a and 13a having inwardly opened grooves are formed at the front ends of the upper plate 11 and both side plates 12 and 13, so that the edges of the inner box (not shown) are inserted. Thereby, the inner box and the outer box 10 are connected.

A groove 1 formed at the lower end of both side plates 12 and 13
2c and 13c are formed so as to be opened downward by a separate process of the side plate. The bending device according to the present invention bends both ends of the outer case iron plate in an "L" shape to form the grooves 12c and 13c. 13c is opened in the horizontal direction so as to be opened downward at the time of the "U" bending so that the protrusion 15a formed to project upward from the bottom plate 15 is inserted. Next, an apparatus and a method for bending will be described.

FIG. 2 shows a half of a bending apparatus according to the present invention. That is, in the present invention, both ends of the outer box iron plate are bent. However, since the left and right structures are symmetric, a portion located on the right side will be described. 2 and 3
The bending device will be described in detail with reference to FIG. As shown in the figure, the bending device includes a base 110 having a rectangular frame shape, and a clamp 120 which is installed above the base 110 so as to be able to move up and down and presses the iron plate 100 for an outer box.
And a bender 130 installed at the edge of the base 110 and rotating outward of the clamp 120 to bend the end of the outer box iron plate 100 upward to realize an “L” shape.

Each component will be described in detail. First,
Describing the base 110, the base 110 extends in the longitudinal direction of the iron plate 100 for an outer box. A conveyor 140 is installed on the base 110 in the longitudinal direction of the outer case iron plate 100 (hereinafter, the longitudinal direction is based on the outer case iron plate).

[0012] The vendor 13 of the clamp 120 according to the present invention.
0 is installed on the right edge of the base 110. The lower frame 161 that supports the outer box iron plate 100 is
The upper frame 1 is disposed so as to be movable in the longitudinal direction with respect to the upper frame 1 and is spaced apart from the upper frame 1
The upper frame 162 and the lower frame 161 are connected to each other by an upright supporting rod 163. The clamp 120 is mounted on the lower side of the upper frame 162 so as to be able to move up and down. The upper frame 162 has a first cylinder 2 on which the operating shaft 201a moves up and down by hydraulic pressure.
01 is installed, and the clamp 120 is installed at the lower end of the operating shaft. The bender 130 is installed on the lower frame 161 of the clamp 120 and rotates counterclockwise with respect to the outer surface of the clamp 120 to rotate the iron plate 100 for the outer box.
But the vendor 130 is in the second cylinder 2
02 is connected to the operating shaft 202b of the first motor shaft 02 via a link 203.

On the other hand, the lower frame 161 is
A position adjusting means 180 for moving in the longitudinal direction of 00 is provided so that the "L" bending portion can be adjusted. The position adjusting means 180 extends from left to right on the base 110 and is mounted on the lower frame 1 so as to be slidable.
A guide 181 that guides the left-right movement of the screw 61 and a screw rod 18 that extends right and left through one side of the lower frame 161
2 and the screw rod 18 connected to the left end of the screw rod 182.
2 for rotating the motor 2. Although not shown, a threaded hole is formed in the lower frame through which the screw rod 182 passes, so that the lower frame can be moved left and right along the rotation direction of the screw rod.

On the other hand, the clamp 120 according to the present invention is installed so as to be variable in width (in the same direction as the width of the outer box iron plate), and is used for bending the outer box iron plate 100 having various widths. To That is, as shown in FIGS. 4 and 5, the clamp 120 includes a plurality of dies 121 and 122 arranged in the width direction, and has a width corresponding to the width of the supplied outer box iron plate 100. Can be varied. The clamp 120 is connected to the operating shaft 2 of the first cylinder 201.
01a, a rod-shaped guide 124 extending in the width direction and having both ends fixed to the housing 125, and holes 123 formed in front and rear are fastened to the guide 124 so as to be movable in the width direction. Although a large number of dies 121 and 122 are provided,
The outer ends of 1,122 are aligned. At this time, steps 121a are formed at the outer ends of the dies 121 and 122 to prevent the grooves 121 and 13b from coming into contact with the dies 121 when the ends of the outer box iron plate 100 are bent. A concave portion into which the coupling portion 12a can be inserted is formed in the mold 121 facing the coupling portion 12a formed on the entire surface of the outer box iron plate 100, and the mold 121 corresponding to the groove of the coupling portion 12a is formed in the mold 121. A projection is inserted into the groove.
A large number of the remaining molds 122 are installed with a small width, and are brought into close contact with the front and rear sides of the coupling portion 13b located on the rear side.

An adjusting means 170 for moving the mold 122 right and left in accordance with the width of the outer box iron plate 100 is installed inside the molds 121 and 122. Adjusting means 17
0 is a screw rod 171 correspondingly extended inside the guide 124 and a motor 17 for rotating the screw rod 171.
2, a fastening part 173 coupled to the screw rod 171 and moving back and forth according to the rotation direction of the screw rod 171;
And a driving source 174 that reciprocates the coupling part 173 so as to be coupled to or separated from the mold 122. The screw rod 171 is rotatably coupled to the housing 125, and the fastening part 173 is coupled to the screw rod 171. And
Although not shown, the drive source can be easily configured using a solenoid, a linear motor, or the like, or using a hydraulic cylinder.

On the other hand, a fastening groove 126 opened in the longitudinal direction is formed in the inner surface of each of the dies 121 and 122, and a protrusion 173a to be inserted into the fastening hole 126 is provided on the inner surface of the fastening portion 173. .

On the other hand, the operating sides 201a and 202a for moving the clamp 120 and the bender 130 are operated by hydraulic pressure, which will be described with reference to FIG. As shown in FIG. 6, the first and second cylinders for operating the clamp 120 and the bender 130 are connected to a pump 204 for pumping a fluid through a hydraulic pipe 203, and a plurality of solenoid valves are provided in the middle of the hydraulic pipe 203. 205 is installed to control the operation of the clamp 120 and the bender 130 by controlling the flow of the fluid to adjust the operation direction of the operation shafts 201a and 202b.

Next, a method of bending an iron plate for an outer box of a refrigerator according to the present invention will be described together with the operation of the bending device. FIG. 7 is a flow chart showing the steps of the method for manufacturing an iron plate for an outer box of a refrigerator according to the present invention. As shown in FIG. 7, the method for manufacturing the outer box iron plate according to the present invention includes adjusting the width of the clamp 120 according to the outer box iron plate, and fixing the position of the outer box iron plate 100 at the initial operation position. A clamp lowering step in which the clamp 120 descends and comes into close contact with the outer box iron plate 100 to form a bending line;
A vendor rotation stage in which the outer plate iron plate is bent to the "L" level by rotating the outer plate 0 using the inner contact as the inner contact;
20 is restored to its original state.

This is shown in FIGS.
This will be described in detail with reference to FIGS. The first preparatory stage includes a position fixing step of moving the outer box iron plate 100 having the connecting portions 101 and 102 formed at the front and rear ends of the width in the length direction by the conveyor 140 and fixing the position at the working position.
Adjusting the width of the clamp 120 according to the width of the iron plate 100 for the outer box. (FIG. 8) The width of the clamp 120 is such that the positions of the dies 121 and 122 are adjusted in accordance with the width of the iron plate for outer box 100 detected by a separate means. After being moved by the dies 121 and 122 corresponding to the width of the outer box iron plate 100 by the rotation of
After the connection with the mold 3, the screw rod 171 is rotated to make close contact with the molds 121 and 122 on the front side. (FIG. 5)

In the second clamping step, a pair of clamps 120 located on the upper part of the fixed
Is lowered by the first cylinder 201 and the iron plate 10
0 to form a bending wire,
This is the step of fixing and supporting 00. (FIG. 9)

In the third stage, the pair of benders 130 are rotated with the outer surface of the clamp 120 as an inner contact point, and the outer plate iron plate 1 is rotated.
This is the stage where 00 is "L" bent. That is, the "L" bending is performed by the bender 130 turning counterclockwise with respect to the clamp 120 to bend the end of the outer box iron plate 100 upward. (Figure 1
0) The fourth stage is a stage in which the clamp 120 and the bender 130 return to their original states. (FIG. 11)

[0022]

As described above in detail, the iron plate bending apparatus and method for the outer box of the refrigerator according to the present invention can adjust the width of the clamp and the bending interval according to the width of the supplied iron plate. Therefore, there is an advantage that the iron plate for the outer box suitable for various kinds of models can be bent. In addition, since there is no concave portion on the outer surface of the mold for forming the bending line, it is possible to prevent the bending line from being bent, and thus, there is an advantage that the aesthetic appearance of the product is improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a refrigerator outer box manufactured by applying a bending device and a manufacturing method according to the present invention.

FIG. 2 is a front view showing an iron plate bending device for an outer box of a refrigerator according to the present invention.

FIG. 3 is a detailed view of the present invention.

FIG. 4 is a side view showing the clamp shown in FIG. 3;

FIG. 5 is a sectional view taken along the line VV in FIG. 4;

FIG. 6 is an inflow circuit diagram illustrating the operation of each vendor according to the present invention.

FIG. 7 is a flowchart illustrating a bending process according to the present invention.

FIG. 8 is a view showing a state in which the width of the clamp is adjusted corresponding to the iron plate for the outer box and the iron plate for the outer box is located at the initial position.

FIG. 9 is a diagram showing a state in which the clamp is lowered to fix the outer box iron plate.

FIG. 10 is a view showing a state in which the vendor has turned to bend the iron plate for the outer box.

FIG. 11 is a view showing a state in which the vendor and the clamp have been restored to their original state.

FIG. 12 is a schematic configuration diagram showing a conventional iron plate bending device for an outer box.

FIG. 13 is a side view of the clamp shown in FIG.

[Explanation of symbols]

 Reference Signs List 10 outer box 100 outer box iron plate 110 base 120 clamp 121, 122 mold 130 vendor 171 screw rod 172 motor 173 fastening part 181 guide 182 screw rod 183 motor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21D 5/04 B21D 5/01 B21D 19/08

Claims (3)

(57) [Claims] A connecting portion (101, 10) is provided at both ends in the width direction.
A base (1) for supporting an outer box iron plate (100) having 2)
10), a number of dies (12) which are provided above and below the base so as to be able to move up and down and are arranged in the width direction of the outer box iron plate (100).
(122); and adjusting means (17) for adjusting the width direction positions of the plurality of dies to adjust the width of the clamps corresponding to the iron plate for the outer box.
0), rotatably provided in a lower portion of said outer box for iron plate facing said clamp, and a vendor (130) for bending the end portion of the iron plate for the outer box of the clamp as the inner contact including
Look, the outer surface of the mold, the end of the iron plate for the outer box at the time of bending
Step for preventing interference with the coupling part formed in the part
Form the same straight line while being formed with a difference (121a)
So that it is extended in the width direction of the outer box iron plate.
It is movably connected to a fixed guide (124).
And, Bei said vendor (130) and the clamp (120)
The lower and upper frames (161, 162)
The base is movable in the longitudinal direction of the box iron plate.
(110) are provided at both ends in the longitudinal direction, and the base (110) is provided with the lower and upper frames.
(161, 162) is moved in the longitudinal direction of the iron plate for the outer box.
That the position adjusting means (180)
Features Iron plate bending equipment for refrigerator outer boxes. 2. The adjusting means (170) is extended corresponding to the guide, and includes a screw rod (171), a motor (172) for rotating the screw rod, and a rotation direction of the screw rod. 2. The fastener according to claim 1, further comprising: a fastening portion coupled to the screw bar so as to reciprocate in a longitudinal direction of the screw bar; and a driving source configured to attach and detach the fastening portion to and from the mold. An iron plate bending device for an outer box of the refrigerator as described in the above. 3. A fastening hole (126) is formed on an inner surface of each of the plurality of dies in a direction perpendicular to the guide, and a projection inserted into the fastening hole is formed in the fastening portion facing the fastening hole. The iron plate bending apparatus for an outer box of a refrigerator according to claim 2, wherein 173a) is provided, and the driving source reciprocates the fastening portion to insert and remove the protrusion from and into the fastening hole.