KR102515993B1 - Press curling method of chassis for display device - Google Patents

Abstract

The present invention relates to a forming method for curling the edge of a chassis used in display devices such as LCD/LED/OLED TVs and smartphones. The present invention provides a method for forming a chassis for a display device, which implements a new chassis forming method in which, when forming a bezel on the edge of a chassis used in a display device, the straight and corner parts of the chassis are efficiently formed by appropriately combining bending, trimming and curling processes, so that the bezel width can be reduced as much as possible, by such means as minimizing the corner inner R and curling width of the chassis, and the strength and flatness of the bezel can be complemented.

Description

Chassis molding method for display device {PRESS CURLING METHOD OF CHASSIS FOR DISPLAY DEVICE}

The present invention relates to a molding method for a chassis for a display device, and more particularly, to a molding method for curling an edge of a chassis used in a display device such as an LCD/LED/OLED TV and a smartphone.

In recent years, with the development of information processing devices, demand for display devices such as image display devices or image display devices that serve as an interface between a user and an information processing device is rapidly increasing.

In particular, the importance of the display device is becoming more prominent in the process of partially completing the development of a high definition television and continuing research on improvement plans therefor.

Common display devices include a color cathode ray tube (CRT), a liquid crystal display (LCD), a fluorescent display (VFD), a plasma display device (PDP), a light emitting diode (LED), an organic light emitting diode (OLED), and the like.

Among these display devices, OLED has recently been competitively improved in performance and structure.

Such OLEDs are mainly used for displays of small devices such as smart phones, car audios, and digital cameras, and large TVs.

In recent years, as LCD/LED/OLED TVs and smartphones have become commonplace, consumers prefer thin bezels that can have a sophisticated feel and at the same time realize a larger screen in the same product size.

However, recently, as technological limitations are gradually decreasing, competition to reduce the width of the bezel as much as possible is intensifying, and even in chassis used for display devices such as large OLED TVs, the width of the bezel is minimized to increase screen immersion and implement a sophisticated design. It is a trend that mainly applies bezel-less design.

Japanese Unexamined Patent Publication No. 2018-122353 Japanese Unexamined Patent Publication No. 2019-169789 Japanese Unexamined Patent Publication No. 2020-72466 Japanese Unexamined Patent Publication No. 2021-9369

Therefore, the present invention has been devised in view of this point, and when forming a bezel on the edge of a chassis used in a display device, the bending process, trim process, and curling process are appropriately linked to efficiently form the straight portion and corner portion of the chassis. By implementing a new chassis molding method for molding, the bezel width can be reduced as much as possible, such as minimizing the inner R and curling width of the corner of the chassis, and chassis molding for display devices that can supplement the strength and flatness of the bezel part. Its purpose is to provide a method.

To achieve the above object, the method for forming a chassis for a display device provided by the present invention has the following characteristics.

The chassis molding method for the display device includes a first step of cutting a chassis body in the form of a square plate using a cutting die and a cutting cutter, and a step of bending the outer portion of the chassis body, including a bending die, a stripper, a bending punch, and a pad A second step of bending the straight portion and the corner portion of the chassis body by using , and a step of pre-bending and simultaneously trimming the straight portion and the corner portion of the chassis body, wherein a pre-bending punch, a pre-bending die, and a pre-bending core are formed. The lower end of the bending part of the straight line is bent at a certain angle using a pre-bending punch, the trimming punch, and the scrap of the corner part are trimmed using a trimming and bending die, and the lower end of the bending part is bent at a certain angle at the same time. Step 3 of curling the straight and corner portions of the chassis body includes a curling die having a round flange portion on a bottom surface, a curling pad having a protrusion on an upper side portion, and a curling die having a groove portion on an upper edge and a jaw portion connected to the groove portion. It is characterized by including a fourth step of curling while rounding the bottom end of the bent portion of the straight portion and the corner portion of the chassis body using a punch.

Here, in the fourth step, when the curling die, the curling pad, and the curling punch are molded with the chassis body therebetween, the vertical width of the protruding portion may be made relatively larger than the vertical depth of the round flange portion, and the left and right length of the protruding portion May be made of a dimension corresponding to the length of the left and right connecting the groove portion and the jaw portion.

And, in the fourth step, the groove portion of the curling punch is formed of both wall surfaces and a curved bottom surface therebetween, and one wall surface of both wall surfaces may be formed in an arc shape.

As a preferred embodiment, in the fourth step, when the curling die, the curling pad, and the curling punch are molded with the chassis body therebetween, the tip of the curling part is accommodated between the lower surface of the protrusion and the upper surface of the jaw so that it is curled to one side. Inducing gaps can be created.

The method for forming a chassis for a display device provided by the present invention has the following effects.

First, by applying a new chassis molding method that efficiently forms the straight and corner parts of the chassis by appropriately linking the bending process, the trim process, and the curling process when molding the chassis of the display device, the inner R of the corner part of the chassis and the curling width are reduced. The width of the bezel can be reduced as much as possible, and the strength and flatness of the bezel part can be supplemented.

Second, there is an effect of cost reduction due to the simplification of the structure of the display device.

Third, by minimizing the inner R and the curling width of the corner of the chassis, there is an effect of increasing the user's sense of immersion through efficient use of the bezel-less design.

Fourth, there is an effect of supplementing the weak parts of the bezel-less design (flange strength, flatness, etc.) by applying a curling shape.

Fifth, by applying a new mold structure and molding method, there is an effect of making the inner round R of the corner portion as small as possible while preventing the corner portion curling from collapsing.

1 to 4 are process charts showing a method of forming a chassis for a display device according to an embodiment of the present invention.
5 is a plan view and a cross-sectional view illustrating a chassis body curled by a chassis molding method for a display device according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 are process charts illustrating a method of molding a chassis for a display device according to an embodiment of the present invention.

As shown in FIGS. 1 to 4 , as a first step, the cutting die 10 and the cutting cutter 11 are used to cut the chassis body 12 in the form of a square plate.

The cutting die 10 and the cutting cutter 11 are arranged vertically, and between the cutting die 10 and the cutting cutter 11 arranged in this way, a chassis material constituting the chassis body 12, for example, about 0.1 to 1 mm A metal material such as aluminum having an approximate thickness is disposed.

In this state, when the press is operated, a cutting operation is performed between the cutting die 10 and the cutting cutter 11, so that the chassis body 12 having a rectangular plate shape having a predetermined size is molded.

At this time, the horizontal × vertical dimensions of the chassis body 12 may be made to include a 90° bending portion formed along the edge.

Next, as a second step, a step of vertically bending the outer portion of the chassis body 12 by 90° is performed.

That is, in the second step, the edge of the straight portion 17 and the corner portion 18 of the chassis body 12 is formed by using the bending die 13, the stripper 14, the bending punch 15, and the pad 16. This step is to bend the part vertically.

To this end, the bending die 13 and the pad 16 are disposed side by side while contacting each other at the top, and the stripper 14 and the bending punch 15 are disposed side by side while contacting each other at the bottom, At this time, the bending die 13 and the stripper 14, the bending punch 15, and the pad 16 can be matched up and down.

Accordingly, the chassis body 12 is disposed between the upper bending die 13 and the pad 16 and the lower stripper 14 and the bending punch 15, and the bending punch 15 and the stripper 14 By the first lifting operation and the second lifting operation of the bending punch 15, the straight portion 17 and the corner portion 18 of the chassis body 12 have bending portions in which the edge portion of the chassis body is vertically bent at 90°. is molded

At this time, the bending portion of the straight portion 17 is formed in a vertical state of 90 °, and the bending portion of the corner portion 18 is formed with a horizontally bent 90 ° bent portion at the lower end of the bent portion in a relationship where the thickness meat is gathered. And the thick flesh formed in this way can be removed in the third step.

Next, as a third step, a step of pre-bending the bent portions of the straight portion 17 and the corner portion 18 of the chassis body 12 and simultaneously trimming them to remove thick flesh is performed.

That is, in the third step, the lower end of the bent portion of the straight portion 17 is bent at a predetermined angle using the pre-bending punch 19a, the pre-bending die 20, and the pre-bending core 21, This is a step of trimming the scrap 24 of the corner portion 18 using the pre-bending punch 19b, the trimming punch 22, and the trimming and bending die 23, while bending the lower end of the bent portion at a certain angle. .

In order to form a pre-bending part in the straight portion 17, a cam (not shown) that operates in an up and down direction includes a pre-bending punch 19a that operates left and right and a cam that operates in an inclined direction (not shown). The pre-bending die 20 operating left and right is disposed left and right, and the pre-bending core 21 is disposed in the upper and lower middle positions of the front part of the pre-bending punch 19a. At this time, the pre-bending core 21 The front end of ) faces the front side of the preceding bending die 20.

In addition, the upper corner of the front end of the core 21 for regular pre-bending is formed in a round or inclined shape, and the straight portion 17 of the chassis body 12 is bent by such a round or inclined shape. As the lower end of the part is bent, it can be pre-bent.

Therefore, the chassis body 12 is fixed to the pre-bending die 20, and the front surface of the bending portion of the straight portion 17 of the chassis body 12 is the same as the front portion of the pre-bending punch 19a and the pre-bending die. It is fixed between the front parts of (20), and at this time, the lower end of the bending part of the straight part 17 is the upper edge part of the front part of the core 21 for pre-bending, that is, the front part made of a round shape or an inclined shape. It is located close to the upper corner part.

In this state, when the pre-bending punch 19a and the pre-bending core 21 move forward, the upper edge portion of the front portion of the pre-bending core 21 bends the lower end portion of the bending portion of the straight portion 17. Therefore, at the lower end of the bent portion of the straight portion 17, a pre-bending portion bent at a certain angle is formed, and the curling process in the fourth step can be performed more effectively due to this pre-bending portion.

Trimming with the preceding bending punch 19b operated left and right by a cam (not shown) operating in the vertical direction in order to form the preceding bending portion in the corner portion 18 and remove the scrap portion. And the bending die 23 is disposed left and right, and the trimming punch 22 is disposed in the upper and lower middle positions of the front part of the preceding bending punch 19b, and the front end of the trimming punch 22 at this time is trimmed and the bending die ( 23) to the front.

In addition, a stepped portion is formed at the lower corner of the upper end of the front portion of the trimming and bending die 23, and at this time, the upper surface of the trimming punch 22 can be positioned with a slight gap above and below the stepped portion.

Therefore, the chassis body 12 is fixed on the trimming and bending die 23, and both sides of the bent portion of the corner portion 18 of the chassis body 12 are in contact with the front portion of the preceding bending punch 19b. It can be fixed between the front part of the trimming and bending die 23, and at this time, a certain section of the lower end of the bending area including the thickness of the corner part 18 is located close to the front end of the trimming punch 22.

In this state, when the preceding bending punch 19b and the trimming punch 22 are moved forward by the cam operation, the trimming punch 22 moves a certain portion of the lower end of the bending area including the thickness of the corner portion 18 (not yet trimmed). (including the part that has not been cut) into the pre-bending groove 34 on the side of the trimming and bending die 23 and bend it to naturally create a pre-bending part, and then the scrap 24 by the forward operation of the trimming punch 22 ) is trimmed.

As a result, a pre-bending portion bent at a certain angle is formed at the lower end of the bent portion of the corner portion 17, and the curling process in the fourth step can be performed more effectively due to the pre-bending portion.

In this third step, the pre-bending process of the straight portion 17, the pre-bending process of the corner portion 18, and the trimming process are performed in one mold, and at the same time, the pre-bending of the straight portion 17 and the corner portion 18 Since the process and the trimming process are performed sequentially (for example, the pre-bending punch is operated in advance to pre-bend the straight part, and the trimming punch is continuously operated to pre-bend and trim the corner part), so the entire process By reducing the number of times, the effect of cost reduction can be expected.

Here, although the corner pre-bending process and the trimming process are performed in one process, they can be molded sequentially according to the amount of operation.

Next, as a fourth step, a step of curling the straight portion 17 and the corner portion 18 of the chassis body 12 is performed.

That is, in the fourth step, the curling die 26 having the flange round part 25 on the bottom surface, the curling pad 28 having the protrusion part 27 on the upper side part, and the groove part 29 and the groove part 29 on the upper edge This is a step of curling the straight portion 17 of the sash body 12 and the bottom end of the bent portion of the corner portion 18 while curling using a curling punch 31 having a jaw portion 30 connected to the ).

To this end, a curling die 26 is disposed on the top, a curling punch 31 is disposed on the left side of the bottom of the curling die 26, and a curling pad 28 is placed on the right side of the bottom of the curling die 26. are placed

Further, when the curling die 26, the curling pad 28, and the curling punch 31 are molded together with the chassis body 12 interposed therebetween, the upper and lower widths of the protrusions 27 of the curling pad 28 are It is made of a relatively large dimension compared to the vertical depth of the flange round portion 25 in the curling die 26, and the left and right lengths of the protrusion 27 at this time are the groove portion 27 of the curling punch 31 and the jaw portion ( 30) can be made with dimensions corresponding to the left and right lengths.

In addition, the groove portion 29 of the curling punch 31 is made of both wall surfaces 29a and 29b and a curved bottom surface 29c therebetween, and any one of the wall surfaces 29a and 29b on both sides is formed. (29b) is made of an arc shape.

The groove 29 of the curling punch 31 may be formed at a predetermined height from the top of the curling punch 31, for example, at a height corresponding to about 1/2 of the upper and lower width of the protrusion 27 at the bottom. there will be

In particular, when the curling die 26, the curling pad 28, and the curling punch 31 are molded together with the chassis body 12 therebetween, the lower surface of the protrusion 27 of the curling pad 28 and the curling punch A gap 32 is formed between the upper surface of the jaw part 30 in (31) to accommodate the end of the curling part and induce it to be curled to one side, and accordingly, the straight part 17 curled by the groove part 29 ) and the lower end of the bent portion of the corner portion 18, for example, a slightly bent portion by pre-bending, can be smoothly curled while being guided to the free space in the gap 32.

Therefore, the sash body 12 is fixed between the curling die 26 and the curling pad 28, and at this time, a certain portion of the lower end of the bent portion of the straight portion 17 and the corner portion 18 of the sash body 12 , For example, the lower portion including the pre-bending portion is not fixed to the curling die 26 side and the curling pad 28 side, and is in a state of hanging down.

In this state, when the curling punch 31 moves upward and is molded with the curling die 26 and the curling pad 28, a certain lower portion including the pre-bending portion is within the groove 29 of the curling punch 31. As it is accommodated, it can be curled while being rolled up and folded.

In this way, the lower certain portion is rolled up and folded by the curved bottom surface 29c, and the end of the lower certain portion is subsequently induced to fold by the arc-shaped wall surface 29b, and accordingly, the end of the lower certain portion The part is bent and folded until it almost touches the inner wall of the bending part, so that the curling width after curling molding can be made as thin as possible.

As the curling molding steps of the first to fourth steps are performed, as shown in FIG. 5, the inner R (round) of the corner portion 18 of the chassis body 12 is about 1 mm, compared to conventional products. It can be molded relatively small, and the width of the straight part 17 of the chassis body 12 and the curled part 33 of the corner part 18 can also be molded relatively narrower than existing products, about 1.6 to 1.8 mm. In this way, by minimizing the width of the inner R and the curling part 33 to simplify the structure of the display device, it is possible to increase the user's immersion by securing a relatively wide screen size even for products with the same specifications as well as cost reduction effects It is possible to secure the design performance and quality of the product, such as effective.

As such, in the present invention, in the case of curling molding of a chassis used in a display device, the bending process, the trim process, and the curling process are linked in combination, and curling is performed on the straight portion and corner portion of the chassis using a mold having a predetermined shape. By applying a new chassis molding method that efficiently forms the chassis, it is possible to minimize the inner R and curling width of the corner of the chassis, and to supplement the strength and flatness of the bezel part, simplifying the structure of bezel-less chassis products, screen It is possible to enhance functionality according to expansion and to compensate for the weak points of bezel-less chassis products.

10: cutting die 11: cutting cutter
12: chassis body 13: bending die
14: stripper 15: bending punch
16: pad 17: straight part
18: corner portion 19a, 19b: pre-bending punch
20: pre-bending die 21: core for pre-bending
22: trimming punch 23: trimming and bending die
24: scrap 25: flange round part
26: curling die 27: protrusion
28: curling pad 29: groove
29a, 29b: wall surface 29c: curved bottom surface
30: chin part 31: curling punch
32: gap 33: curling part
34: leading bending groove

Claims (4)

A first step of cutting the rectangular plate-shaped chassis body 12 using the cutting die 10 and the cutting cutter 11;
In the step of bending the outer portion of the chassis body 12, the straight portion 17 of the chassis body 12 is bent using a bending die 13, a stripper 14, a bending punch 15, and a pad 16. A second step of bending the corner portion 18;
Pre-bending and simultaneously trimming the straight portion 17 and the corner portion 18 of the chassis body 12, the pre-bending punch 19a, the pre-bending die 20, and the pre-bending core 21 The lower end of the bent portion of the straight portion 17 is bent at a predetermined angle by using, and in addition, the corner portion 18 by using the preceding bending punch 19b, the trimming punch 22, and the trimming and bending die 23. A third step of trimming the scrap 24 of ) and simultaneously bending the lower end of the bent part at a predetermined angle;
As a step of curling the straight portion 17 and the corner portion 18 of the chassis body 12, the curling die 26 having the flange round portion 25 on the bottom and the protrusion 27 on the upper side of the side is curling. The straight part 17 and the corner part of the chassis body 12 are formed by using a pad 28 and a curling punch 31 having a groove part 29 on the upper surface edge and a jaw part 30 connected to the groove part 29. A fourth step of curling while rounding the lower end of the bent portion of (18);
including,
In the third step, the pre-bending punch 19b operated left and right by a cam operating in an up-and-down direction and a trimming and bending die in order to form a pre-bending portion in the corner portion 18 and remove the thickness portion as well. (23) is disposed left and right, and a trimming punch 22 is disposed at an upper and lower middle position of the front surface of the preceding bending punch 19b, and the front end of the trimming punch 22 is disposed on the front surface of the trimming and bending die 23. to be towards,
A stepped portion is formed at the upper lower corner of the front portion of the trimming and bending die 23, and the upper surface portion of the trimming punch 22 can be positioned with a slight gap above and below the stepped portion,
The chassis body 12 is fixed on the trimming and bending die 23, and both sides of the bent portion of the corner portion 18 of the chassis body 12 are trimmed and trimmed with the front portion of the preceding bending punch 19b. It can be fixed between the front part of the bending die 23, and a certain section of the lower end of the bending part including the thickness of the corner part 18 is located close to the front end of the trimming punch 22,
In this state, when the preceding bending punch 19b and the trimming punch 22 are moved forward by the cam operation, the trimming punch 22 trims and By dragging it into the leading bending groove 34 on the side of the bending die 23 and bending it, a leading bending part is naturally made, and then the scrap 24 is trimmed by the forward operation of the trimming punch 22 Display, characterized in that A method of forming a chassis for a device.
The method of claim 1,
In the fourth step, when the curling die 26, the curling pad 28, and the curling punch 31 are molded with the chassis body 12 interposed therebetween, the upper and lower widths of the protrusions 27 are equal to the width of the round flange 25. Chassis for a display device, characterized in that it is made of a relatively large dimension compared to the vertical depth, and the left and right lengths of the protrusions (27) are made of dimensions corresponding to the left and right lengths connecting the groove portion (27) and the jaw portion (30). molding method.
According to claim 1 or claim 2,
In the fourth step, the groove 29 of the curling punch 31 is made of both wall surfaces 29a and 29b and a curved bottom surface 29c therebetween, and either one of the both wall surfaces 29a and 29b is formed. A method of forming a chassis for a display device, characterized in that the wall surface (29b) of the wall surface (29b) is formed in an arc shape.
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