KR101774337B1 - A Manufacturing Apparatus of a Metal Roofing Tile - Google Patents

Abstract

The present invention relates to an apparatus to manufacture a metal roofing tile by forming a metal plate. More specifically, a metal mold means composed of upper portion and lower portion metal molds to form a bent portion in a transverse direction of the metal plate which forms a hill and a valley along a longitudinal direction by passing through an upper and lower rolling means of a plurality of rows is configured with a double metal mold made of a bent metal mold portion forming a support metal mold portion supporting the introduced metal plate and the bent metal mold portion forming the bent portion in the supported metal plate. In addition, a support bracket supporting the double metal mold is driven forwards and backwards while the bent portion is quickly formed simultaneously in the introduced metal plate, and the double metal mold is compactly installed toward inside the support bracket such that separate repairing is able to quickly be performed, and productivity of the metal roofing tile drastically improved.

Description

TECHNICAL FIELD [0001] The present invention relates to a metal mold for manufacturing a metal mold,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a metal plate and a manufacturing apparatus for forming a tile by forming a metal plate, and more particularly to a metal plate and a manufacturing apparatus, The mold means including the upper and lower molds is formed by a supporting mold portion for supporting the inflow metal plate member and a double mold portion for forming a bending portion for supporting the metal plate member so as to form the support bracket for supporting the metal mold, It is possible to quickly form the bending portion on the incoming metal plate by making the forward and backward movement of the kettle and to provide the double mold to the inside of the support bracket in a compact manner to speed up the disassembly and repair, And a manufacturing apparatus using the metal mold.

In recent years, many buildings are constructed as a prefabricated building, and since the roof of such a prefabricated building uses a metal tile formed to show its own shape like a tiled roof, the demand for metal tiles is increasing rapidly.

Conventionally, the apparatus for manufacturing a metal tile as described above is divided into a material supply process for supplying a metal plate material in a roll form, a molding process for forming a supplied steel plate, a cutting process for cutting a molded product, Because all the processes are made by semi-mastering, it takes a lot of time and the productivity is low and the workability is low.

In order to overcome the above-described problems, a number of metal machines and molding machines for automating the connection lines of the feeder, the molding device, and the cutting device have been introduced.

Such a conventional metal machine and a forming apparatus are provided with a rolling means for supplying a metal plate while rotating and a metal plate material supplied from the rolling means passing through a multi-stage (usually six to ten stages) upper and lower rollers, A secondary molding apparatus for forming a bent portion in a transverse direction of a metal plate on which a metal plate and a crest are formed on the metal plate in the primary molding apparatus; A cutting device for cutting the formed metal tile, and a conveyor means for transporting the cut metal tile to be carried by a transportation means or the like.

The secondary molding apparatus includes an upper mold and a lower mold, a sliding guide installed on a side surface of the upper mold and the lower mold to support the upper mold to be vertically slidable, and an operating cylinder for driving the upper mold to slide up and down do.

Accordingly, when the metal plate material flows between the upper mold and the lower mold, the upper mold is slidably supported by the sliding guide while being supported by the operating cylinder, thereby forming a bending-molded metal tile in the metal plate.

KR 10-2005-0103434 (publication number) 2005.10.31. KR 10-0712263 (registration number) 2007.04.20. KR 10-0769351 (registration number) 2007.10.16.

As described above, in the conventional mold means for forming a bent portion on a metal plate through which a mountain and a crest are formed while passing through a rolling means, the upper mold is slid up and down along the guide means to bend the introduced metal plate, .

However, since the conventional molding apparatus is provided so that the upper mold is slid up and down along the guide means provided on both sides of the mold means, the upper and lower molds become larger and complicated and the guide means must be disassembled during the repair of the mold. There is a costly problem.

In addition, the conventional mold means has a problem that the productivity is low because the upper mold has a long sliding distance (stroke) and thus the production speed is slow.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

A metal mold for forming a mountain and a valley along the longitudinal direction, a mold means for molding the metal mold in the transverse direction, a support metal mold for supporting the incoming metal plate vertically, and a double metal mold for bending the metal plate And a support bracket for supporting the double mold is moved forward and backward to quickly form a bending part on the incoming metal plate, thereby providing a metal machine and a manufacturing apparatus using a double metal mold that dramatically improves the productivity with the metal machine It has its purpose.

Another object of the present invention is to provide a double mold of a supporting mold part and a bending mold part which are compactly installed inside the support bracket so as to be able to be operated, so that disassembly and repair can be performed quickly and conveniently, To increase the economic efficiency.

It is a further object of the present invention to provide a method of manufacturing a semiconductor device, in which a supporting metal mold part and a bending mold part which are separated from each other are supported by first and second supporting guides provided on both inner side end faces, And the first and second support guides are provided on the inner sides of both end surfaces to uniformly receive the weight of the support metal part and the bending metal part, .

Another object of the present invention is to provide a metal mold and a manufacturing apparatus using a double metal mold capable of manufacturing a metal tile which is vertically bent at regular intervals while the supply of the metal plate is continuously performed without interruption.

In order to accomplish the above object, the present invention provides a manufacturing apparatus for manufacturing a metal tile by forming a mountain, a bone and a bent portion while continuously supplying a thin metal plate material of a thin film, comprising: a base member supported on a bottom surface; A metal sheet material feeding means for rolling and feeding a thin, thin metal sheet material which is connected and rolled, a plurality of metal sheet material feeding means for feeding the metal sheet material from the upper side of the base member, Roller forming means for passing through a roller provided in a row to form an obtuse and a valley in a longitudinal direction, and a mold means for forming a bent portion in the metal sheet fed from the roller forming means, A support metal part for holding the metal plate fed from the roller forming part, The bend is provided with the bent portion molding mold side portion of the plate member.

Further, the present invention is characterized in that the above-described mold means is provided with a supporting mold portion and a bending mold portion which are provided in a double mold portion side by side, wherein the supporting mold portion is provided with a lower supporting mold provided on the lower side, And a first support guide provided inside both side portions of the lower support die and the upper support die for guiding the upward and downward movement of the upper support die, Wherein the bending die portion includes a lower bending die provided at a lower side, an upper bending die provided at an upper side facing the lower bending die, a second lifting cylinder vertically lifting the upper bending die, And a second supporting leg provided inside both side portions of the upper bending mold and guiding the upward and downward movement of the upper bending metal, .

Further, according to the present invention, the mold means is mounted on the inner side of a mold supporting bracket slidably mounted on the base member so as to be reciprocated back and forth, and is slidably reciprocated according to the operation of the supporting bracket, A lower jigbraket provided on an upper side of the base member and slidably reciprocating back and forth along a sliding rail provided on an upper surface of the base member to mount the lower supporting die and the lower bending die on an upper surface thereof, An upper support bracket installed on the upper surface of the upper support bracket so as to face the upper support bracket and having the first lift cylinder and the second lift cylinder installed on the upper surface thereof, Member.

Further, in the present invention, an operation cylinder for sliding the mold supporting bracket back and forth is connected to a rear side of the lower side zebraket, and a control supporting bracket for controlling forward sliding of the mold supporting bracket at the front side is provided Wherein the operation cylinder is constituted by a body portion to which hydraulic pressure is supplied and an operation rod which is inserted into the body portion and slidably moved back and forth, the body portion is connected to the base member, Lt; / RTI >

In addition, according to the present invention, the height of the upper surface of the lower supporting die provided in the supporting die portion is higher than the height of the upper surface of the lower bending die provided in the bending die portion, so that the bending portion 104 can be formed And a bending cylinder for vertically elevating and lowering the lower bending mold provided in the bending mold part and forming the bending part due to the height difference is further installed on the lower side of the lower side zipper.

The first support guide may include a first protrusion protruding from the upper support metal mold, and a first fin provided in the lower support metal mold and having an inner hollow to receive the first protrusion; The second support guide is formed of a second protrusion protruding from the upper bending mold and a second pin provided in the lower bending mold and having an interior hollow to receive the second protrusion.

Also, the length of the first protrusion is longer than the gap between the upper and lower support dies, and the length of the second protrusion is longer than the gap between the upper bending die and the lower bending die.

Therefore, the metal mold and the manufacturing apparatus according to the present invention are characterized in that the metal mold for forming the bending portion in the transverse direction of the metal plate forming the mountain and the bone along the longitudinal direction includes a support metal portion for supporting the incoming metal plate, The support bracket for supporting the double mold is moved forward and backward to rapidly form the bending portion on the incoming metal sheet, thereby remarkably improving the productivity with the metal tile. .

Further, according to the present invention, the double mold of the support mold part and the bending mold part can be compactly installed and operated inside the support bracket so that the disassembly and repair can be performed quickly and conveniently, thereby reducing maintenance time and cost, There are also advantages to giving.

In addition, since the support metal part and the bending metal part separated by the upper and lower parts are supported by the first and second support guides provided on both inner side end faces, it is possible to separate the first and second support guides in case of failure, And the first and second support guides are provided on the inner sides of both side end faces to uniformly accommodate the weight of the supporting mold portion and the bending mold portion, thereby reducing the possibility of abrasion.

The present invention is advantageous in that a metal tile which is vertically bent in three stages can be manufactured even if the metal plate material is continuously drawn.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic plan view of a metal mold and a manufacturing apparatus using a double metal mold according to the present invention,
FIG. 2 is a schematic side elevational view of a metal machine and a manufacturing apparatus using a double metal mold according to the present invention,
3 is an enlarged perspective view of a metal mold using a double mold according to the present invention and a double mold means provided in the manufacturing apparatus,
FIG. 4 is an enlarged schematic perspective view of a metal mold using a double mold according to the present invention and a double mold tool provided in the manufacturing apparatus,
5 is a state sectional view of a metal mold using a double mold according to the present invention and a double mold means provided in the manufacturing apparatus,
FIG. 6 is an operational state diagram in which a bending portion is formed in a metal plate by using a double metal mold using the double metal mold according to the present invention and a double metal mold provided in the manufacturing apparatus,
FIG. 7 is a view showing an operation state in which a metal bracket using a double metal mold according to the present invention and a support bracket provided with a double metal mold provided in the manufacturing apparatus are moved forward and backward.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 to 7, the metal mold and the manufacturing apparatus 100 using the double metal mold according to the present invention,

A base member 110 mounted on the bottom surface,

A metal plate material supply means 120 connected to the base member 110 and rolling and feeding a thin metal sheet material 101 in a plurality of rolls,

The metal plate material provided on the upper side of the base member 110 and supplied from the metal plate material supply means 120 is pressurized and passed through a plurality of rows of rollers in the upper and lower sets, Roller forming means 130 for forming the mountain 102 and the valleys 103,

And mold means (140) for forming a bending portion (104) in the metal plate material (101) supplied from the roller forming means (130)

The mold means 140 includes a support mold portion 150 for holding the metal plate material 101 supplied from the roller molding means 130 and a bending portion 104 for molding the bending portion 104 on the mold plate material 101 And a bending mold part 160 are provided side by side.

As shown in FIG. 2, the metal part 100a forms the mountain 102 projecting upwardly along the longitudinal direction (longitudinal direction) of the metal plate 101 and the trough 103 projecting to the lower side, And the bending portion 104 is formed in a transverse direction perpendicular to the longitudinal direction, and then cut into unit lengths.

1 and 2, the metal plate material supplying unit 120, which rolls and rolls the metal plate material 101, is mounted on the base member 100, (110).

The roller forming means 130 is provided on the upper side of the base member 110.

The roller forming means 130 is provided with a plurality of roller means at regular intervals such that the upper roller 131 and the lower roller 132 form a pair of roller means.

In general, the roller forming means 130 may be provided with about 6 to 10 roller means, but it may be installed more than that.

The roller 102 is installed such that the radius of curvature of the upper roller and the lower roller gradually decreases toward the front side, and the mountain 102, which is formed by pressing the metal plate 101 while passing between the upper roller and the lower roller, And the valley of the trough 103 gradually increase.

Here, the driving of the upper and lower rollers constituting the roller means is configured to be rotated by roller driving means (not shown) connected to the base member 110.

As described above, the metal plate material 101 supplied from the metal plate material supply unit 120 passes through the roller means of the roller forming means 130, so that mountains and valleys are formed along the longitudinal direction.

The metal plate 101 on which the mountain 102 and the valley 103 are formed passes through the roller forming means 130 and passes through the mold means 140 to form the bent portion 104 do.

The mold means 140 is formed by molding the bent portion 104 on the support metal mold 150 and the mold metal plate 101 that hold the metal plate 101 supplied from the roller forming means 130, And the bending mold portion 160 is provided in parallel.

The support mold part 150 includes a lower support mold 151 provided at the lower side and an upper support mold 152 provided at the upper side opposite to the lower support mold 151, A first elevating cylinder 153 for elevating and lowering the upper supporting die 152 and a lower elevating cylinder 153 for supporting the lower supporting die 151 and the upper supporting die 152, And a support guide (154).

The bending mold part 160 includes a lower bending mold 161 disposed at the lower side and an upper bending mold 162 disposed at the upper side facing the lower bending mold 161. The upper bending mold 162, And a second elevating cylinder 163 for vertically elevating and lowering the upper bending mold 162 and a second elevating cylinder 163 for vertically elevating and lowering the upper bending mold 162. The second bending cylinder 163 is disposed inside both side portions of the lower bending mold 161 and the upper bending mold 162, And a support guide (164).

The first support guide 154 is formed of a first protrusion protruding from the upper support metal mold 152 and a first fin provided in the lower support metal mold 151 and having an interior hollow to receive the first protrusion, The second support guide 164 is formed of a second protrusion protruding from the upper bending mold 162 and a second pin provided in the lower bending mold 161 and having an interior hollow to receive the second protrusion,

The length of the first protrusion is longer than the gap between the upper support mold 152 and the lower support mold 151 and the length of the second protrusion is longer than the gap between the upper bending mold 162 and the lower bending mold 161 The upper support metal mold 152 may be separated from the lower support metal mold 151 during manufacturing even if the distance between the upper support metal mold 152 and the lower support metal mold 151 is distanced by the vertical movement of the upper support metal mold 152 of the support metal mold part 150, The upper bending die 162 is not separated from the lower bending die 161 during manufacturing even if the upper bending die 162 is separated from the lower bending die 161 by the upward and downward movement of the bending die portion 160. [ ).

Meanwhile, the separation between the upper support die 152 and the lower support die 151 is separated by elevating the upper support die 152 so that the first projections can be separated from the first pins for maintenance. Further, the separation of the lower bending mold 161 from the upper bending mold 162 is separated by raising the upper bending die 162 so that the second projection can be separated from the second fin.

The first support guide 154 has a pair of outer guides 154a provided at both ends so as to stably provide a supporting force thereof and a pair of inner guides 154a provided inside the outer guide 154a, (154b). On the other hand, the second support guides 164 are provided on both ends at only one pair.

The mold means 140 is installed inside the mold supporting bracket 170 which is slidably mounted on the base member 110 so as to be reciprocated forward and backward and is reciprocated forward and backward according to the operation of the supporting bracket 170 .

The mold supporting bracket 170 is provided on the upper side of the base member 110 and slides forward and backward along the sliding rail 111 provided on the upper surface of the base member 110, A lower support jig 171 on which the lower support die 151 and the lower bending die 161 are mounted and a lower jig jig 171 on the upper side of the lower jig jig 171, The upper supporting bracket 172 on which the second lifting cylinder 163 is installed and the fixing support member 173 provided on both sides of the lower supporting jig 171 and the upper supporting bracket 172 for supporting the upper supporting bracket 172 ).

The first lifting cylinder 153 and the second lifting cylinder 163 are provided on the upper surface of the upper support bracket 172 and the first lifting cylinder 153 supports the upper support mold 152 vertically And the second elevating cylinder 163 is installed to vertically move the upper bending die 162. [

An operation cylinder 180 for sliding the mold supporting bracket 170 forward and backward is connected to the lower side zip jaw 171 at the rear side and a forward end of the mold supporting bracket 170 And a control bracket 190 for controlling sliding is connected.

The operation cylinder 180 includes a body portion 181 to which hydraulic pressure is supplied and an operation rod 182 which is inserted into the body portion 181 and slidable back and forth. 110 and the end of the operating rod 182 is connected to the lower ground zebraket 171.

In this configuration, the operation rod 182 is extended when the lower side zebraket 171 is advanced. In this case, the operation rod 182 is not extended by the driving of the hydraulic pressure but simply the lower side zebraket 171 When the lower ground jigket 171 is moved backward, hydraulic pressure is supplied to the body portion 181 by a separate control unit (not shown), and the operation rod 182 is forced So that the lower side zebra kettle 171 is retracted.

That is, the actuating cylinder 180 is installed such that the actuating rod 182 is operated (contracted) by hydraulic pressure only when the mold supporting bracket 170 is moved backward.

On the other hand, when the lower jigket 171 is moved backward, its backward stroke is controlled by stopper means provided on the base member 110.

Here, the stopper means is a technical structure which can be easily implemented by the person skilled in the art, and a detailed description thereof will be omitted.

A bending cylinder 174 for forming the bending portion 104 to vertically move up and down the lower bending die 161 provided in the bending die portion 160 is further installed on the lower side of the lower side zipper 171 Respectively.

5, the height of the upper surface of the lower supporting die 151 provided in the supporting die part 150 is set to be greater than the height of the upper surface of the lower bending die 161 provided in the bending die part 160. [ The height difference h is formed so as to form the bent portion 104.

When the metal plate 101 in which the crest and the valley are formed due to the height difference h formed as described above is transferred to and flows into the upper side of the lower support metal mold 151 and the lower bending metal mold 161, The upper supporting metal mold 152 provided on the supporting metal mold part 150 is lowered first to hold the metal plate material 101 and then the lower end of the lower metal mold material 101 is pressed by the operation rod of the bending cylinder 174 The bending die 161 is pushed up by the height difference h. At the same time, the upper bending die 162 is lowered and the lower bending die 161 is lowered by the height difference h. As a result, the bent portion 104 is formed in the metal plate 101.

The upper support metal mold 152 and the upper bending metal 162 are raised in the reverse order so that the metal plate member 101 is advanced and transported.

The procedure by which they are operated is schematically shown in Figures 6 (a) to 6 (d).

Since the metal plate 101 having the bent portion 104 formed therein while passing through the mold means 140 is continuously pushed forward by the roller forming means 130, When the upper support die 152 and the upper bending die 162 are raised, they continue to move forward even after passing through the mold member 140.

Fig. 7 schematically shows an operation procedure in which the mold supporting bracket 170 advances and retreats.

At this time, the control bracket 190 provided at the front side of the lower paper jig 171 prevents the metal plate 101 from moving forward.

The control support bracket 190 is pushed forward by the force of the metal plate 101 to move forward so that the lower support zebra keel 171 connected to the control support bracket 190 moves to the base member 110, And is slid forward along the sliding rail 111 provided on the front side.

The control bracket 190 includes support brackets 191 that are provided on both sides and are connected to and fixed to the lower jigket 171 and support plates 191 that are installed between the support brackets 191, And a bent support member 193 provided on the rear surface of the support plate 192 to support the bent portion 104 formed on the metal plate 101. Since the bent portion 104 is bent downward in the plane of the metal plate, it can be regarded as a stepped step, and the bent portion supporting member 193 is supported by the stepped portion.

The support plate 192 is vertically movable up and down by a control unit (not shown). The shape of the front surface of the bending part support member 193 is preferably the same as that of the rounded bending part 104.

That is, when the metal plate 101 passes through the mold means 140 to form the bent portion 104 and then is continuously advanced and conveyed, the bending portion support member 193 of the control bracket 190, The bending portion 104 is supported. Then, the bending portion support member 193 is slid forward by the feed force of the metal plate 101 (the pushing force from the roller forming means).

The control support bracket 190 advances as the bending portion support member 193 slides forward so that the mold supporting bracket 190 connected to the support bracket 191 of the control support bracket 190 advances, The kettle 170 is slid forward.

On the other hand, a cutting means 200 for cutting (cutting) the metal plate 101 and completing (making) the metal plate 100a is installed in front of the control supporting bracket 190.

Therefore, when the control bracket 190 moves forward, the control bracket 191 is lifted up. At this time, the metal plate 101 continues to advance in a state where the bent portion 104 is formed, The metal member 100a is completed while being cut at the cutting means 200.

The control support bracket 190 and the mold support bracket 170 are moved back to their original positions to repeat the same process.

The metallic material and the metal material 100a produced by cutting the material by the cutting means 200 are transported by separate transportation means (not shown).

As described above, the metal mold and the manufacturing apparatus using the double metal mold according to the present invention can be manufactured by using a metal plate which forms a mountain and a bone along the longitudinal direction while passing between the upper and lower rolling means of a plurality of rows, Is constituted by a double metal mold comprising a support metal mold part for supporting the metal plate to be introduced and a metal mold part for bending the metal plate to be supported, and the support bracket for supporting the metal mold is moved forward and backward It is possible to rapidly mold the inflowing metal plate and to provide a compact double mold to the inside of the support bracket, so that the disassembly and repair can be speeded up, and the productivity with the metal plate can be remarkably improved.

100: Metal mold and manufacturing equipment using double mold
100a: metal body and 101: metal plate material 102: acid 103: corrugation 104:
110: base member 111: sliding rail
120: means for supplying metal plate material
130: roller forming means 140: mold means
150: Supporting die part
151: lower support mold 152: upper support mold
153: first elevating cylinder 154: first supporting guide
160: Bending mold part
161: lower bending mold 162: upper bending mold
163: second lift cylinder 164: second support guide
170: mold supporting bracket
171: Lower paper zebraket 172: Upper support bracket
173: Fixing support member 174: Bending cylinder
180: actuating cylinder 181: body part 182: working rod
190: Control bracket
191: Support bracket 192: Support plate 193: Bending support member
200: Cutting means

Claims (7)

1. A manufacturing apparatus for manufacturing a metal tile by forming a mountain, a bone and a bent portion while continuously supplying a thin metal plate material of a thin film,
A base member supported on the bottom surface,
A metal plate material supply means connected to the base member and rolling the thin metal sheet material in a plurality of layers,
A metal plate material provided on the upper side of the base member and supplied from the metal plate material supply means is pressed and pressed between rollers provided in a plurality of rows in an upper and a lower set to form mountains and valleys in the longitudinal direction, Molding means,
And mold means for forming a bending portion in the metal plate supplied from the roller forming means,
Wherein the mold means is provided with a supporting metal mold portion for holding the metal plate material supplied from the roller forming means and a bending mold portion for forming the bending portion on the metal plate material,
The mold supporting means is mounted on an inner side of a mold supporting bracket that is slidably mounted on the base member so as to be reciprocated forward and backward,
Wherein the mold supporting bracket includes a lower side zipper jaw slidably reciprocating back and forth along a sliding rail provided on the base member, an upper supporting bracket disposed to face the lower side zipper keeper, And a stationary support member provided on both sides of the stationary support member,
And a control bracket for controlling forward sliding of the mold supporting bracket is connected to the front side of the lower jig bracket,
The operation cylinder is composed of a body portion to which hydraulic pressure is supplied and an operation rod inserted into the body portion and slidable back and forth, the body portion being connected to the base member, and the end portion of the operation rod being connected to the lower- Metals and manufacturing equipment using molds.
The method according to claim 1,
Wherein the mold means includes a support mold portion and a bending mold portion which are provided as a double mold portion,
The support metal mold includes a lower support metal mold provided on a lower side and an upper support metal provided on an upper side opposite to the lower support metal mold, a first lift cylinder for vertically lifting and lowering the upper support metal mold, And a first support guide provided inside both side portions of the support die for guiding the up and down movement of the upper support die,
The bending die includes a lower bending die provided at a lower side, an upper bending die provided at an upper side facing the lower bending die, a second lifting cylinder vertically lifting the upper bending die, And a second support guide provided inside each of the side surface portions of the bending mold to guide the upward and downward movement of the upper bending metal.
delete delete 3. The method of claim 2,
The height of the upper surface of the lower supporting die provided in the support metal part is higher than the height of the upper surface of the lower bending metal provided in the bending metal part so that a difference in height is formed so as to form the bending part,
Wherein the lower bending jig is provided with a bending cylinder for vertically elevating and lowering the lower bending die provided in the bending die and forming the bending due to the difference in height.
3. The method of claim 2,
The first support guide may include a first protrusion protruding from the upper support metal mold and a first fin provided in the lower support metal mold and having an inner hollow to receive the first protrusion;
Wherein the second support guide is formed of a second protrusion protruding from the upper bending mold and a second pin provided in the lower bending mold and having an interior hollow to receive the second protrusion.
The method according to claim 6,
The length of the first protrusion is longer than the gap between the upper support mold and the lower support mold,
And the length of the second protrusion is longer than the gap between the upper bending die and the lower bending die.

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