KR101659737B1 - Manufacturing method of filler pipe of refill hole of automobile fuel tank and molding apparatus for the same - Google Patents

Abstract

Disclosed are a method for manufacturing a filler pipe mounted in a vehicle fuel tank and a mold device for the same. The method for manufacturing the filler pipe mounted in the vehicle fuel tank according to the present invention includes: a forward-direction drawing step of forming a cylinder with a flange unit on the top by processing a metallic plate; a reverse-direction drawing step of pushing a bottom of the cylinder through an internal space limited by a lateral wall to protrude further than the flange; and a pipe unit forming step of drilling the bottom of the cylinder. According to the present invention, the method for manufacturing the filler pipe mounted in the vehicle fuel tank is capable of fundamentally preventing faulty products due to weld defects by integrally forming the filler pipe by press-processing the metallic pipe without using multiple components. In addition, a filler pipe manufacturing process is simplified by omitting processes for manufacturing and assembling the individual components. Thus, productivity can be remarkably improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filler pipe for a fuel tank,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filler pipe mounted on a fuel tank of a vehicle, and more particularly, to a manufacturing method for integrally molding a filler pipe and a mold apparatus therefor.

2. Description of the Related Art Generally, a fuel tank of a vehicle is connected to a fuel supply line for supplying fuel to an engine and a filler pipe for injecting fuel through a lubricator. Particularly, one end of the filler pipe is provided at one side It is connected to a gas supply.

1 shows a state where a filler pipe 20 is mounted on one side of a fuel tank 10. When the fuel tank 10 is made of a metal material, the filler pipe 20 is welded to the fuel tank 10 .

Patent Document 1 and Patent Document 2 are prior art documents related to a conventional filler pipe 20.

2, the conventional filler pipe 20 includes a pipe 21 having both ends passed therethrough, a flange 21 coupled to the outside of the pipe 21 at a position spaced apart from the one end of the pipe 21 by a predetermined distance, (24), and at the other end of the pipe (21), a diameter-enlarged portion (22) having a larger diameter than the other portion is formed.

The filler pipe 20 welds the flange 24 to the outer surface of the fuel tank 10 while one end of the pipe 21 is inserted into the fuel tank 10, .

Therefore, when the clamping band is attached to the outer circumferential surface of the lubrication line surrounding the filler pipe 20 after inserting the filler pipe 20 into one end of the lubrication line, the lubrication line is connected to the fuel tank 10.

However, the conventional filler pipe 20 has the following problems.

First, in order to manufacture the filler pipe 20, the manufacturing process of the pipe 21, the manufacturing process of the flange 24, and the welding process of joining the pipe 21 and the flange 24 must be performed, There is a limit to height.

Second, the conventional filler pipe 20 is welded to the pipe 21 and the flange 24, and the welded portion (28 in FIG. 2) in which the ends of the metal plate materials are coupled to each other is formed in the longitudinal direction And thus the ratio of product defects due to welding defects is high.

Korean Registered Patent No. 10-1271337 (Announced 2013.06.04) Korean Patent Publication No. 10-2010-0005415 (published Jan. 15, 2010)

SUMMARY OF THE INVENTION It is an object of the present invention to simplify a manufacturing process of a filler pipe and to increase productivity through the process.

Further, it is an object of the present invention to prevent a product failure due to welding defects by integrally molding a filler pipe without manufacturing a plurality of parts.

In order to achieve this object, one aspect of the present invention provides a method of manufacturing a filler pipe mounted to a fuel tank of a vehicle.

According to an aspect of the present invention, there is provided a filler pipe manufacturing method comprising: a forward drawing step of forming a cylindrical body having a flange portion at an upper end thereof by molding a metal plate material; A reverse drawing step of pushing up the bottom of the cylindrical body through the inside of the side wall to protrude from the flange; And a pipe portion forming step of perforating the bottom of the cylindrical body and molding the perimeter of the perforated bottom to the same diameter as the side wall.

At this time, after the forming of the pipe part, a step of forming a bulging part through bulging and curling may be formed at one end of the pipe part.

And forming a welding protrusion on the bottom surface of the flange portion after the forward drawing step, after the reverse drawing step, or after the pipe section forming step.

Another aspect of the present invention provides a progressive mold apparatus for manufacturing a filler pipe mounted on a fuel tank of a vehicle. A progressive mold apparatus according to the present invention includes: a forward drawing die for forming a cylindrical body having a flange portion at an upper end by molding a metal plate material; A reverse drawing die which pushes up the bottom of the cylindrical body through the inside of the side wall and protrudes from the flange; A piercing mold for perforating the bottom of the cylindrical body; And a burring mold for forming a pipe portion by molding the periphery of the perforated bottom of the cylindrical body to the same diameter as the side wall.

Further, in the progressive mold apparatus according to the present invention, the reverse drawing die includes a plurality of reverse drawing punches; A plurality of reverse drawing dies provided at locations opposite each of the plurality of reverse drawing punches; A plurality of ring-shaped discharge pins each surrounding the plurality of reverse drawing punches; And a discharge pin spring for providing an elastic force to the discharge pin, wherein the discharge pin discharges the cylindrical body from the reverse drawing punch by pushing the lower end of the upward bent portion formed at the lower end of the cylindrical body.

Further, in the progressive mold apparatus according to the present invention, the burring mold may include: a first die installed to the holder so as to be elastically movable; A burring punch disposed through the first die; And a ring-shaped second die which is provided at a position facing the first die and surrounds a space into which the burring punch is inserted, wherein in the burring mold, the process of forming the pipe part by the burring punch, And a flange portion forming step of forming a welding projection on the flange portion located between the second dies are performed at the same time.

Further, the progressive mold apparatus according to the present invention may further comprise: a bulging mold for forming a scaled portion having a predetermined length from one end of the pipe portion; A curling die which holds one end of the enlarged portion; And a trimming die for cutting the flange portion to a predetermined diameter.

Further, the progressive mold apparatus according to the present invention is characterized in that a flange forming die is provided next to the forward drawing die, the reverse drawing die, the piercing die, or the burring die, and then welding protrusions are formed on one surface of the flange .

At this time, the flange forming die includes: a guide inserted into the cylindrical body; A flange drawing punch for forming a circumferential groove on one surface of the flange portion in a ring shape surrounding the guide; A discharge pad provided outside the flange drawing punch and elastically moving; A ring-shaped flange drawing die installed at a position facing the flange drawing punch and surrounding a space into which the cylindrical body is inserted; And a die spring for providing an elastic force to the flange drawing die. A ring-shaped discharge pin provided between the flange drawing punch and the guide, and a discharge pin spring for providing an elastic force to the discharge pin.

A stepped groove is formed in an outer upper end of the flange drawing punch and a protrusion is formed around the groove of the flange by pressing one surface of the flange into the stepped groove.

According to another aspect of the present invention, there is provided a filler pipe mounted on a fuel tank of a vehicle, comprising: a pipe portion having both ends penetrated; An upward bent portion bent outward from one end of the pipe portion and extending toward the other end of the pipe portion; A flange portion bent outwardly from an upper end of the upwardly bent portion along a radial direction of the pipe portion; And a welding protrusion formed on one surface of the flange portion.

According to the present invention, it is possible to fundamentally prevent product defects due to welding defects by integrally molding the metal plate material by press working without forming the filler pipe into a plurality of parts.

In addition, the manufacturing process of the individual parts and the assembly process are omitted, so that the manufacturing process of the filler pipe is simplified, thereby greatly improving the productivity of the product.

1 is a view illustrating a state in which a filler pipe is mounted on a fuel tank
2 is a cross-sectional view of a conventional filler pipe
3 is a cross-sectional view of a filler pipe according to an embodiment of the present invention.
4A and 4B are flowcharts showing a filler pipe manufacturing process according to an embodiment of the present invention
5 is a view showing a progressive mold apparatus for manufacturing a filler pipe and a metal plate used therein according to an embodiment of the present invention
6 is a view showing a forward drawing die among the progressive mold apparatuses
7 is a view showing the reverse drawing die among the progressive mold apparatuses
8 is a view showing a flange forming mold and a piercing mold among the progressive mold apparatuses
9 is a view showing a main configuration of a flange forming die among the progressive die apparatus
10 is an enlarged view of a portion A in Fig. 9
11 is a view showing a burring mold in a progressive mold apparatus
12 is an enlarged view of a portion B in Fig. 11

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. It is to be noted that the accompanying drawings are for the purpose of understanding the present invention and that the scope of rights of the present invention should not be construed as limiting the scope of the present invention.

3, the filler pipe 100 according to the embodiment of the present invention includes a pipe portion 110 having both ends penetrated, a pipe portion 110 bent outward from one end of the pipe portion 110, A flange portion 120 bent outwardly in the radial direction of the pipe portion 110 at the upper end of the upward bent portion 112 and a flange portion 120 bent and protruded from the bottom end portion of the flange portion 120. [ And a welding protrusion 122 formed.

The pipe 110 is preferably circular in cross section, but is not limited thereto. Particularly, the pipe portion 110 is formed by press-working a metal plate rather than welding both ends of the metal plate like a normal metal pipe, and is characterized in that there is no welded portion.

The flange portion 120 is ring-shaped symmetrically arranged along the outer circumferential surface of the pipe portion 110, and its inner end is integrally connected to the upper end of the upward bent portion 112.

The welding projection 122 has a substantially triangular cross-sectional shape and is a portion welded to the outer surface of the fuel tank when the filler pipe 100 is welded to the fuel tank (10 of FIG. 1).

As described above, the filler pipe 100 according to the embodiment of the present invention is not formed after the pipe 110 and the flange 120 are manufactured separately, but the pipe 110 and the flange 120 are press- And is characterized in that it is molded integrally with the body.

If the filler pipe 100 is manufactured by integrally molding the pipe 110 and the flange 120, it is possible to prevent the product failure due to welding defects between the pipe 110 and the flange 120 In addition, the manufacturing process can be simplified and productivity can be improved.

Hereinafter, a method of manufacturing the filler pipe 100 according to an embodiment of the present invention will be described with reference to FIGS. 4A and 4B.

First, as a preparing step, a piercing mold is used to perforate a predetermined position of a metal plate, and a cutting line is formed at a predetermined position of the metal plate using a lancing mold. (ST 11)

Subsequently, a part of the metal plate is downwardly deformed using a forward drawing mold to form a cylindrical body 130 including the side wall 132 and the bottom 134. The protruding portion protruding outward from the upper end of the side wall 132 of the cylindrical body 130 is the flange portion 120 and the flange portion 120 is formed into a shape as shown in FIG.

The forward drawing die may include a plurality of drawing dies having different diameters and moving distances from the drawing punches. In this case, the drawing process is repeated while changing the drawing die until the diameter of the cylindrical body 130 reaches the target value . (ST 12)

After reaching the target diameter through the forward drawing, a reverse drawing mold is used to push the bottom 134 of the cylinder 130 upwards through the interior of the side wall 132.

The reverse drawing progresses until the bottom 134 of the cylindrical body 130 reaches the top of the flange portion 120 by the target height. When the backward drawing is performed, the cylindrical body 130 faces downward, and the upwardly bent upwardly bent portion 112 is formed at the lower end of the side wall 132 of the cylindrical body 130 by bending outward, The inner end of the flange portion 120 is integrally connected to the upper end of the flange portion 112.

In this case, the drawing process is repeated while changing the drawing die until the bottom 134 of the cylindrical body 130 reaches the target height. In this case, the reverse drawing die may include a plurality of drawing dies having different drawing punches. . (ST 13)

The flange forming process is then performed. Specifically, the outer end of the flange portion 120 extending in the horizontal direction from the outer side of the cylindrical body 130 is pressed downward to form a groove 121 along the circumferential direction on the bottom surface of the flange portion 120, A protrusion 123 protruding downward from the outer end of the groove 121 is formed.

The protrusion 123 is a portion formed in the shape of the welding protrusion 122 of FIG. 3 through a subsequent molding process. (ST 14)

After the flange molding is completed, a through-hole 136 is formed in the bottom 134 of the cylindrical body 130 using a piercing mold. (ST15)

A burring punch is introduced from the inlet of the cylindrical body 130 to perform a burring process for expanding the peripheral portion of the penetrating portion 136 to the same diameter as the side wall 132 of the cylindrical body 130. When the burring process is completed, the bottom of the cylindrical body 130 is completely removed, so that the shape corresponding to the pipe 110 of FIG. 3 is obtained.

Meanwhile, in the embodiment of the present invention, a process of molding the protruding portion 123 of the flange portion 120 into the welding protrusion 122 of the triangular shape is performed at the same time while performing the burring process. (ST16)

Next, a bulging process and a curling process are performed on the upper end of the pipe section 110 to form a ridge on the upper end of the pipe section 110. (ST17, ST18)

Subsequently, when the flange portion 120 is trimmed along the outer end of the welding protrusion 122, the filler pipe 100 having the shape as shown in FIG. 3 is completed. (ST 19)

In order to manufacture the filler pipe 100 according to the method of FIGS. 4A and 4B, a press mold capable of performing individual processing must be used. Although these press dies may be individually installed, in the embodiment of the present invention, a progressive molding apparatus is used to increase productivity through a continuous process.

5, the progressive mold apparatus 200 according to the embodiment of the present invention includes a piercing and lancing mold 210, a forward drawing die 220, A reverse drawing die 230, a flange forming mold 240, a piercing mold 250, a burring mold 260, a bulging mold 270, a curling mold 280, trimming ) Mold 290, and the like.

The progressive mold apparatus 200 is composed of an upper mold 200a and a lower mold 200b as a whole and sequentially presses the metal plate S while the upper mold 200a moves up and down. Parts such as punches, dies, etc. constituting each of the dies are disposed at positions corresponding to each other of the upper mold 200a and the lower mold 200b.

Hereinafter, each of the dies constituting the progressive mold apparatus 200 will be described in detail.

The piercing and lancing mold 210 is a mold for forming a perforation and a cutting line in the metal plate S that has entered the mold apparatus 200 to prepare a subsequent process.

6, the forward drawing metal mold 220 includes first, second, and third forward drawing punches 222a, 222b, and 222c mounted on a punch holder 221 of an upper metal mold, Second, and third forward drawing dies 226a, 226b, 226c mounted on the mold.

The first forward drawing punch 222a is installed to penetrate the movable stripper 223 which performs an elastic movement with respect to the punch holder 221. The second and third forward drawing punches 222b and 222c are disposed in the punch holder 221, Through another movable stripper 224 which performs an elastic movement with respect to the movable stripper 224. A spring 227 is connected to the bottom of the first, second and third forward drawing dies 226a, 226b, 226c.

The forward drawing metal mold 220 is for forming the metal plate S into a cylindrical body (130 in FIG. 4A). In the embodiment of the present invention, the forward drawing metal mold 220 is rotated in the first and second directions until the diameter of the cylindrical body 130 reaches the target value. The second, and the third forward drawing punches 222a, 222b, and 222c are used to perform the drawing process three times.

To this end, the first, second, and third forward drawing punches 222a, 222b, 222c are smaller in diameter and the first, second, and third forward drawing dies 226a, 226b, Diameter. The number of the forward drawing punches and the corresponding drawing die is not necessarily limited to this.

Meanwhile, in the embodiment of the present invention, a piercing punch 225 is installed around the first forward drawing punch 222a, and the piercing punch 225 is connected to the cylindrical body 130 formed by the first forward drawing punch 222a To separate the cylindrical body 130 and the metal plate S from each other. However, the cylindrical body 130 is not completely separated from the metal plate S, and the flange portion 120 and the surrounding metal plate S must be connected through the bridge.

The reverse drawing die 230 includes first, second, third, and fourth reverse drawing punches 232a, 232b, 232c, and 232d mounted on a punch holder 231 of a lower mold, Second, third, and fourth reverse drawing dies 236a, 236b, 236c, and 236d mounted on the upper mold, respectively.

The first to fourth reverse drawing punches 232a, 232b, 232c and 232d are provided through the movable stripper 233 which performs elastic movement with respect to the punch holder 231. The first to fourth forward drawing dies 236a 236b, 236c, 236d are connected to a spring 238. [

The reverse drawing die 230 is configured to push up the bottom 134 of the cylindrical body 130 formed by the forward drawing die 220 upward through the inside of the side wall 132 as shown in ST 13 of FIG. In the embodiment of the present invention, the side wall 132 is pushed up step by step through four steps using the first to fourth reverse drawing punches 232a, 232b, 232c and 232d. The number of the reverse drawing punches is not limited thereto.

A discharge pin 234 is provided around the first to fourth reverse drawing punches 232a, 232b, 232c and 232d and a discharge pin spring 235 for resilient movement of the discharge pin 234 is provided in the lower mold. Respectively.

The discharge pin 234 is in the form of a ring surrounding the respective reverse drawing punches 232a, 232b, 232c and 232d. After the reverse drawing process is completed, the discharge pin 234 rises to form an upward bent portion 112 formed at the lower end of the cylindrical body 130, And pulls the cylindrical body 130 from the respective reverse drawing punches 232a, 232b, 232c, and 232d.

The flange forming mold 240 is for forming a flange 120 formed on the periphery of the cylindrical body 130. As shown in the detailed views of FIGS. 8 and 9, 1 and second flange drawing punches 242a and 242b, respectively, and first and second flange drawing dies 243a and 243b mounted on the upper mold respectively.

In the lower mold, two guides 244 inserted into the cylindrical body 130 are protruded upward during the flange forming process. The first and second flange drawing punches 242a and 242b are ring-shaped to surround each guide 244, and the upper ends thereof are installed lower than the upper ends of the guides 244.

The first and second flange drawing punches 242a and 242b are not formed in the same shape and stepped grooves 2420 are formed on the outer upper surface of the second flange drawing punch 242b as shown in a partial enlarged view of FIG. . When the bottom surface of the flange portion 120 is press-fitted into the stepped groove 2420, protrusions corresponding to the shape of the stepped groove 2420 (see ST14 and 123 in FIG. 4A) are formed on the bottom surface of the flange portion 120. [

Outside the first and second flange drawing punches 242a and 242b, there is provided a discharge pad 245 coupled to the holder 241 so as to be elastically movable.

9, a discharge pin 249a is provided on the inner side of the first and second flange drawing punches 242a and 242b, and a discharge pin 249a is provided on the lower metal mold for the elastic movement of the discharge pin 249a. A spring (249 in Fig. 8) is provided.

The discharge pin 249a has a substantially ring shape and serves to push up the lower end of the upward bent portion 112 formed at the lower end of the cylindrical body 130 to pull the cylindrical body 130 from the flange drawing punches 242a and 242b do.

The first and second flange drawing dies 243a and 243b are each installed through a movable stripper 246 that performs an elastic movement with respect to the holder by a spring 248 and is connected to the holder by a die spring 247 Do elastic movement.

Each of the first and second flange drawing dies 243a and 243b has a ring shape surrounding a space into which the cylindrical body 130 is inserted and has a lower end connected to the upper ends of the first and second flange drawing punches 242a and 242b Respectively.

Therefore, in the flange forming die 240, upwardly convex grooves 121 are formed on the bottom surface of the flange 120 by the first flange drawing punch 242a and the first flange drawing die 243a.

The height of the groove 121 previously formed by the second flange drawing punch 242b and the second flange drawing die 243b is lowered while the vicinity of the outer end of the groove 121 is lowered by the second flange drawing punch 242b And protruding portions 123 are formed downward. The protrusion 123 thus formed is formed into a welding protrusion (122 in Fig. 3) through a subsequent process.

Referring again to FIG. 8, the piercing mold 250 includes a piercing punch 251 provided through the movable stripper 246 of the upper mold, and a piercing die 252 provided in the lower mold. The upper end of the piercing die 252 enters into the interior of the cylindrical body 130 and abuts against the bottom 134 and the piercing die 252 is installed through a movable stripper 254 which resiliently moves with respect to the holder 241 .

The burring mold 260 includes a burring punch 261 and a first die 262 mounted on the lower mold, and a second die 266 provided on the upper mold, as shown in Fig.

The first die 262 is installed to be elastically movable relative to the back plate by a spring 263, and a burring punch 261 is installed through the first die.

Particularly, on the upper surface of the first die 262, a welding projection forming groove 265 is formed in the circumferential direction as shown in a partially enlarged view of FIG. 12, and the welding projection forming groove 265 is in a substantially triangular concave shape. A guide groove 264 is formed on the inner side of the first die 262 to receive the lower end of the pipe 110.

The second die 266 is ring-shaped surrounding the space in which the pipe section 110 is inserted, and the lower end thereof corresponds to the first die 262.

The second die 266 is installed through a movable stripper 267 which is resiliently moved with respect to the holder by a spring 269 and the second die 266 is subjected to elastic movement with respect to the holder by a die spring 268 do.

The bulging mold 270 further includes a bulging punch provided in the upper mold and a bulging die provided in the lower mold to support the pipe portion 110,

The curling mold 280 is a mold for lifting the upper end of the pipe portion 110 extended by the bulging process back to the inside. The curling punch includes a curling punch provided in the upper mold and a curling punch provided in the lower mold, Die.

The trimming mold 280 is a mold for cutting the flange portion 120 protruding outward from the pipe portion 110 and separating the flange portion 120 from the metal plate material S and includes a trimming punch provided in the upper mold, Die.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary,

For example, in FIGS. 4A and 4B, the flange forming process ST 14 is performed after the reverse drawing process ST 13, but the present invention is not limited thereto. That is, the flange forming step (ST14) may be performed after the piercing step (ST15), the burring step (ST16), the bulging step (ST17) or the curling step (ST18).

Also, in the burring and welding protrusion forming process ST16, the deburring process and the process of forming the welding protrusion 122 on the flange 120 are simultaneously performed. However, the deburring process and the welding protrusion 122 forming process are separately performed You may.

In this case, it is needless to say that the procedure of the above-described program sheave mold apparatus 200 may be changed accordingly.

The forward drawing punches 222a, 222b and 222c are mounted on the upper mold and the reverse drawing punches 232a, 232b, 232c and 232d are mounted on the lower mold in the progressive mold apparatus 100 according to the embodiment of the present invention The forward drawing punch may be installed on the lower mold, and the reverse drawing punch may be mounted on the upper mold. This is also the case for the other molds.

It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. I will do it.

100: filler pipe 110: pipe part
112: upward bending portion 114:
120: flange portion 121: flange groove
122: welding protrusion 123: protrusion
130: cylindrical body 132: side wall
134: bottom 136:
200: Progressive mold apparatus 210: Piercing and lancing mold
220: Forward drawing die 221: Punch holder
222a, 222b, 222c: first, second and third forward drawing punches
223, 224: movable stripper 225: piercing punch
226a, 226b, 226c: first, second, third forward drawing die
227: Discharge spring 230: Reverse drawing die
231: Punch Holder
232a, 232b, 232c, 232d: first, second, third and fourth reverse drawing punches
233, 237: movable stripper 234: discharge pin
235: Discharge pin spring 238: Spring
240: Flange forming mold 241: Holder
242a, 242b: first and second flange drawing punches 2420: stepped groove
243a, 243b: first and second flange drawing die
244: Guide 245: Discharge pad
246: movable stripper 247: die spring
248: spring 249: discharge spring
249a: exhaust pin 250: piercing mold
251: Piercing punch 252: Piercing die
254: Movable sprinkler 260: burring mold
261: burring punch 262: first die
263: spring 264: guide groove
265: welding protrusion forming groove 266: second die
267: Movable sprocket 268: Die spring
269: spring 270: bulging mold
280: a curling mold 290: a trimming mold

Claims (12)

delete delete delete delete 1. A progressive mold apparatus for manufacturing a filler pipe mounted on a fuel tank of a vehicle,
A forward drawing die for forming a cylindrical body having a flange portion at an upper end thereof by molding a metal plate material;
A reverse drawing die which pushes up the bottom of the cylindrical body through the inside of the side wall and protrudes from the flange;
A piercing mold for perforating the bottom of the cylindrical body;
A burring mold for forming a pipe portion by molding the periphery of the perforated bottom of the cylindrical body to the same diameter as the side wall,
Wherein the reverse drawing die comprises:
A plurality of reverse drawing punches;
A plurality of reverse drawing dies provided at locations opposite each of the plurality of reverse drawing punches;
A plurality of ring-shaped discharge pins each surrounding the plurality of reverse drawing punches;
A discharge pin spring for providing an elastic force to the discharge pin;
Wherein the discharge pin discharges the cylindrical body from the reverse drawing punch by pushing the lower end of the upward bent portion formed in the cylindrical body, 1. A progressive mold apparatus for manufacturing a filler pipe mounted on a fuel tank of a vehicle,
A forward drawing die for forming a cylindrical body having a flange portion at an upper end thereof by molding a metal plate material;
A reverse drawing die which pushes up the bottom of the cylindrical body through the inside of the side wall and protrudes from the flange;
A piercing mold for perforating the bottom of the cylindrical body;
A burring mold for forming a pipe portion by molding the periphery of the perforated bottom of the cylindrical body to the same diameter as the side wall,
Wherein the burring mold comprises:
A first die installed in the holder so as to allow elastic movement, and having a welding protrusion forming groove formed on a surface thereof;
A burring punch disposed through the first die;
A ring-shaped second die disposed at a position facing the first die and surrounding a space into which the burring punch is inserted,
And a flange forming step of forming a welding protrusion on a flange positioned between the first die and the second die at the same time as the pipe forming step by the burring punch and the flange forming step between the first die and the second die are simultaneously performed in the burring mold. The method according to claim 5 or 6,
A bulging mold forming a necked portion having a predetermined length from one end of the pipe portion;
A curling die which holds one end of the enlarged portion;
A trimming die for cutting the flange portion to a predetermined diameter;
Further comprising: a progressive mold device 6. The method of claim 5,
The forward drawing die, the reverse drawing die, and the piercing die. Or a flange forming die provided next to the burring mold and forming welding protrusions on one surface of the flange portion 1. A progressive mold apparatus for manufacturing a filler pipe mounted on a fuel tank of a vehicle,
A forward drawing die for forming a cylindrical body having a flange portion at an upper end thereof by molding a metal plate material;
A reverse drawing die which pushes up the bottom of the cylindrical body through the inside of the side wall and protrudes from the flange;
A piercing mold for perforating the bottom of the cylindrical body;
A burring mold for forming a pipe portion by molding the periphery of the perforated bottom of the cylindrical body to the same diameter as the side wall;
A flange forming die provided next to the forward drawing die, the reverse drawing die, the piercing die, or the burring die to form welding protrusions on one surface of the flange section;
Wherein the flange forming die comprises:
A guide inserted into the cylindrical body;
A flange drawing punch for forming a circumferential groove on one surface of the flange portion in a ring shape surrounding the guide;
A discharge pad provided outside the flange drawing punch and elastically moving;
A ring-shaped flange drawing die installed at a position facing the flange drawing punch and surrounding a space into which the cylindrical body is inserted;
A die spring for providing an elastic force to the flange drawing die
And a control unit 10. The method of claim 9,
A ring-shaped discharge pin provided between the flange drawing punch and the guide, and a discharge pin spring for providing an elastic force to the discharge pin. 10. The method of claim 9,
Wherein a stepped groove is formed at an outer upper end of the flange drawing punch and a protruding portion is formed around the groove of the flange portion by press-fitting one surface of the flange portion into the stepped groove. delete

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