JP6912061B2 - Manufacturing method of fuel refueling pipe - Google Patents

Description

The present invention relates to a method for manufacturing a fuel oil supply pipe to be fixed to a vehicle body using a fixture.

Conventionally, the fuel refueling pipe of a vehicle not only has a rust preventive coating on the surface to prevent rust, but also has a risk of being charged by the flow of fuel flowing inside the pipe, thus preventing the fuel from catching fire due to spark discharge. It is common to provide a grounding point for this purpose.

For example, the fuel refueling pipe disclosed in Patent Document 1 has a structure of being attached to a vehicle body by using two brackets, and its surface is coated with rust preventive coating. An unpainted unpainted part is provided on a part of the surface of the middle part of the refueling pipe body, and a conductive heat-shrinkable tube is wrapped around the part corresponding to the unpainted part of the refueling pipe body. There is. Then, the unpainted part, the conductive tube and the non-painted part, the conductive tube and the conductive tube are held by sandwiching and gripping the portion of the oil supply pipe main body around which the tube is wound by two conductive brackets, and fixing both brackets to the vehicle body with the grounding fixing bolt. The refueling pipe body is grounded to the vehicle body via each bracket to prevent charging.

By the way, in the non-painted portion of the refueling pipe body as described above, generally, after a sealing material for masking is attached to a desired position of the refueling pipe body that has been bent or the like, the entire surface of the refueling pipe body is covered. Is then formed by peeling the sealing material from the main body of the oil supply pipe. Therefore, when manufacturing the fuel refueling pipe, it is necessary to clarify the sticking position of the sealing material on the refueling pipe main body so that the operator or the like does not mistake the sticking position of the sealing material on the refueling pipe main body.

In order to deal with this, for example, in Patent Document 2, when a worker or the like attaches a masking sealing material to an object to be coated, a laser beam in a visible light region is applied to a position where the sealing material is attached to the object to be coated. It is conceivable to irradiate and attach the sealing material to the reflection position as a mark, and to clarify the attaching position of the sealing material to the fuel pipe main body by using this method.

Japanese Unexamined Patent Publication No. 2003-127676 Japanese Unexamined Patent Publication No. 05-169010

By the way, in the production of the fuel refueling pipe as described above, after the metal pipe is bent or expanded to obtain the refueling pipe main body, the refueling pipe main body is subjected to pre-painting treatment such as degreasing cleaning and chemical conversion treatment. After that, a sealing material for masking is attached to the main body of the refueling pipe at a desired position, and then the coating is applied. Therefore, if it is attempted to attach the sealing material to the desired position of the refueling pipe main body by using the method as described in Patent Document 2, the refueling pipe main body is positioned in the masking step between the painting pretreatment step and the painting step. It is necessary to install a jig and a laser oscillator, and a large space for installing these facilities is required additionally on the production line, and there is a problem that the cost increases. Further, in a fuel refueling pipe production line, it is common to suspend and transport the refueling pipe body from the pre-painting process to the painting process, so that such a hanging transport system is used. Incorporating the above-mentioned jigs and laser oscillators makes it difficult to design a production line using existing equipment.

The present invention has been made in view of these points, and an object of the present invention is a method for manufacturing a low-cost fuel refueling pipe capable of designing a production line using existing equipment without unnecessarily expanding the space. Is to provide.

In order to achieve the above object, in the present invention, when a metal pipe is bent or expanded to obtain a refueling pipe main body before pre-painting treatment, the refueling pipe main body is marked with a masking sealing material. It is characterized in that it is formed in.

Specifically, it is made of a metal having a non-conductive coating on the surface, fixed to the vehicle body using a fixture, and having a non-painted portion for grounding the vehicle body at a position corresponding to the fixture. In the method of manufacturing the fuel refueling pipe in Japan, the following solutions were taken.

That is, in the first invention, when the oil supply pipe main body is obtained from the metal pipe through the machining process, the pipe expansion process, the bending process and the welding assembly process, the processing means attached to the arm tip of the industrial robot is used. A heat treatment is applied to the planned formation position of the unpainted portion on the refueling pipe main body to discolor it, or overlay welding is performed to form a mark portion, and then the refueling pipe main body is subjected to pre-painting treatment. After attaching a sealing material to the mark portion and applying a non-conductive coating over the entire surface of the refueling pipe main body, the sealing material is peeled off from the refueling pipe main body to form the non-painted portion. Alternatively, after applying a non-conductive coating over the entire surface of the refueling pipe main body, the coated portion corresponding to the marking portion is polished to expose the marking portion to form the non-painted portion. It is characterized by.

In the second invention, in the first invention, the processing means is a processing head capable of irradiating a laser beam excited by a laser oscillator, and the refueling pipe main body is subjected to the heat of the laser light emitted from the processing head. The mark portion is formed by discoloring the surface, and then a sealing material is attached to the mark portion and a non-conductive coating is applied to the surface of the oil supply pipe main body, and then the seal material is applied to the oil supply pipe main body. It is characterized in that the non-painted portion is formed by peeling from the surface.

In the third invention, in the second invention, the refueling pipe main body has a plating layer on the surface thereof, and in the laser oscillator, the plating layer evaporates to expose the material surface of the refueling pipe main body. It is characterized in that it is controlled to irradiate a laser beam having a calorific value that does not occur from the processing head.

In the fourth invention, in the first invention, the processing means is a discharge coating torch, and the electrode material of the discharge coating torch is transferred to the surface of the oil supply pipe main body to discolor the surface of the oil supply pipe main body. The mark portion is formed by allowing the seal to be formed, and then a sealing material is attached to the mark portion and a non-conductive coating is applied to the surface of the oil supply pipe main body, and then the seal material is peeled off from the oil supply pipe main body. It is characterized by forming the unpainted portion.

In the fifth invention, in the first invention, the processing means is a welding torch capable of MIG brazing, and the brazing material of the welding torch is adhered to the surface of the main body of the oil supply pipe to build up the coating. After forming the mark portion and then applying a non-conductive coating over the entire surface of the oil supply pipe main body, the painted portion corresponding to the mark portion is polished to expose the mark portion and the non-painted portion is exposed. It is characterized by forming a portion.

In the first invention, a jig for fixing the oil supply pipe body required for forming the mark portion can be used as a jig installed in advance from the machining process to the welding assembly process, and between the pre-painting process and the painting process. Since it is not necessary to newly install a jig just to form a mark portion, it is not necessary to wastefully expand the space of the production line, and the equipment cost can be kept low. In addition, since it is not necessary to modify the hanging transfer system between the painting pretreatment process and the painting process in a general production line, it is possible to design a production line using existing equipment.

In the second invention, since the processing speed is high, the formation speed of the mark portion is high, and the fuel refueling pipe can be efficiently manufactured.

In the third invention, when the mark portion is formed, the plating layer remains in the region corresponding to the mark portion on the surface of the fuel supply pipe body and the material surface of the fuel supply pipe body is not exposed. The painted part becomes more resistant to rust, and it can be used as a fuel oil supply pipe with high rust prevention.

In the fourth invention, since the mark portion can be formed without using the laser oscillator having a high running cost as in the second and third inventions, the fuel refueling pipe can be manufactured at a low cost.

In the fifth invention, when the mark portion is formed, the area of the mark portion on the surface of the oil supply pipe main body rises and becomes conspicuous as compared with other regions, so that the visibility of the mark portion is improved. Therefore, the need for the masking step of attaching the sealing material to the mark portion as in the second to fourth inventions is eliminated, and the work efficiency of manufacturing the fuel oil supply pipe 1 can be further improved.

It is a perspective view which shows the fuel refueling pipe manufactured by using the manufacturing method in Embodiment 1 of this invention. It is an enlarged view of the attachment structure part of the fuel refueling pipe to a vehicle body in FIG. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. The block diagram of the production line to which the manufacturing method in Embodiment 1 of this invention was applied is shown. It is a figure which shows the state which the retainer is attached to the oil supply pipe main body, and the mark part is formed in the welding assembly process. FIG. 5 is a cross-sectional view taken along the line VI-VI of FIG. After FIG. 6, it is a figure which shows the state which the sealing material was attached to the mark part in the masking process. After FIG. 7, it is a figure which shows the state which applied the coating on the surface of the oil-fueling pipe main body in the coating process. After FIG. 8, it is a figure which shows the state which the sealing material was peeled off from the surface of a refueling pipe main body in a mounting assembly process. It is a figure corresponding to FIG. 6 which concerns on Embodiment 2 of this invention. After FIG. 10, it is a figure which shows the state which the seal material was attached to the mark part in the masking process. After FIG. 11, it is a figure which shows the state which applied the coating on the surface of a refueling pipe main body in a coating process. After FIG. 12, it is a figure which shows the state which the sealing material was peeled off from the surface of a refueling pipe main body in a mounting assembly process. It is a figure corresponding to FIG. 4 which concerns on Embodiment 3 of this invention. It is a figure corresponding to FIG. 6 which concerns on Embodiment 3 of this invention. After FIG. 15, it is a figure which shows the state which applied the coating on the surface of a refueling pipe main body in a coating process. After FIG. 16, it is a figure which shows the state which polished the region corresponding to the mark part in the coating layer in the equipment assembly process.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is essentially merely an example.

<< Embodiment 1 of the invention >>
FIG. 1 shows a fuel refueling pipe 1 manufactured by the manufacturing method according to the first embodiment of the present invention. The fuel refueling pipe 1 is formed of a cylindrical metal pipe, has a refueling pipe main body 1c having a plating layer 10a (see FIG. 6) on its surface, a short cylindrical metal retainer 1d, and an elongated cylindrical shape. It is provided with a metal breather tube 2.

One end of the refueling pipe main body 1c is connected to a fuel tank (not shown) of the vehicle, while the other end side of the refueling pipe main body 1c is formed with a pipe expansion portion 1e.

The surface of the oil supply pipe main body 1c is subjected to an organic film treatment (cationic electrodeposition coating, powder coating, etc.) to form a non-conductive coating film layer 10d (see FIGS. 8 and 9). As shown in 3, a circular first non-painted portion 1b is formed only in one place in the middle portion.

The surface of the retainer 1d is treated with an organic film (cationic electrodeposition coating, powder coating, etc.) to make it non-conductive. It is inserted and connected by laser welding (see FIG. 5).

The surface of the breather pipe 2 is treated with an organic film (cation electrodeposition coating, powder coating, etc.) to make it non-conductive, and fuel is supplied to the fuel tank using the retainer 1d and the fuel pipe main body 1c. At this time, the air containing the vaporized fuel is evacuated from the fuel tank to the refueling port 1a side of the refueling pipe main body 1c.

As shown in FIG. 3, the fuel refueling pipe 1 is attached to a predetermined position of the vehicle body B by using the fixture 3.

The fixture 3 has a grip 4 that grips the fuel oil supply pipe 1 and the breather pipe 2, a metal fixing bolt 5 that fixes the grip 4 to the vehicle body B, and a thickness in which a through hole 6a is formed in the center. It is provided with a plate-shaped rubber member 6 to have.

The gripper 4 includes a bracket 7 and a cover panel 8 which are arranged in the radial direction of the oil supply pipe main body 1c and in a direction orthogonal to the side-by-side arrangement direction of the oil supply pipe main body 1c and the breather pipe 2.

The bracket 7 is obtained by press-molding a strip-shaped metal plate, and has an organic film treatment (cationic electrodeposition coating, powder coating, etc.) on the surface to make it non-conductive.

At the center of one end of the bracket 7 in the longitudinal direction, an engaging claw 71 having a substantially L-shaped cross section formed by bending on the opposite side of the cover panel 8 is provided.

A first grip portion 72 that is curved so as to be recessed on the opposite side of the cover panel 8 is formed at a portion of the bracket 7 that is continuous with the engaging claw 71 on one end side in the longitudinal direction, and the first grip portion 72 is a fuel pipe main body. It has a shape corresponding to the outer peripheral surface of 1c.

The first grip portion 72 is formed with a fitting recess 72a recessed on the opposite side of the cover panel 8, and an overhanging portion 72b is formed in the center of the bottom surface thereof so as to project substantially hemispherically toward the oil supply pipe main body 1c. ing.

A second unpainted portion 72c is formed on the tip surface of the overhanging portion 72b so that the metal portion is exposed without being painted.

The rubber member 6 can be fitted into the fitting recess 72a with the overhanging portion 72b corresponding to the through hole 6a.

An elongated hole 73 extending in the longitudinal direction of the bracket 7 is formed in a portion continuous with the first grip portion 72 in the middle portion of the bracket 7, and a mounting nut 9a with a washer is formed on the opposite side of the cover panel 8 in the bracket 7. Is welded so as to correspond to the elongated hole 73.

Further, on the other end side of the bracket 7 in the longitudinal direction, a second grip portion 74 curved so as to be recessed on the opposite side of the cover panel 8 is formed, and the second grip portion 74 corresponds to the outer peripheral surface of the breather tube 2. It has a shape.

As shown in FIG. 2, the cover panel 8 is a pressed part having a wide cross section and a substantially U-shape that opens to the bracket 7 side, and has an organic film treatment (cationic electrodeposition coating, powder coating, etc.) on the surface. It has been applied to make it non-conductive.

The cover panel 8 has a pair of standing wall portions 81 facing the oil supply pipe main body 1c and the breather pipe 2 in the parallel direction, and a substantially rectangular plate-shaped cover portion 82 connecting one edge portion of the compatible wall portion 81 to each other. I have.

Flange portions 83 that protrude in directions away from each other and extend along the oil supply pipe main body 1c are formed on the other edges of the standing wall portion 81, and the cover panel 8 is attached to the vehicle body B on each of the flange portions 83. A mounting hole 83a is formed for mounting on the.

Further, as shown in FIG. 3, the one standing wall portion 81 is formed with an engaging hole 81a to which the engaging claw 71 of the bracket 7 can be engaged.

As shown in FIGS. 1 to 3, a recessed portion 84 recessed on the bracket 7 side is formed in the center of the cover portion 82 on one side in the extension direction of the oil supply pipe main body 1c.

A flat portion 84a is formed on the bottom surface of the recessed portion 84, and a bolt insertion hole 84b is formed in the center of the flat portion 84a.

As shown in FIG. 3, an unpainted third unpainted portion 84c is formed on the peripheral edge of the bolt insertion hole 84b on the flat portion 84a on the opposite side of the bracket 7, and a mounting bolt is formed in the bolt insertion hole 84b. When the 9b is inserted from the opposite side of the bracket 7, the head of the mounting bolt 9b comes into contact with the third unpainted portion 84c.

As shown in FIG. 3, a third grip portion 85 curved so as to be recessed on the opposite side of the bracket 7 is formed between one of the standing wall portion 81 and the recessed portion 84 in the cover portion 82, and the third grip portion Reference numeral 85 denotes a shape corresponding to the outer peripheral surface of the oil supply pipe main body 1c.

On the other hand, between the other standing wall portion 81 and the recessed portion 84 of the cover portion 82, a fourth grip portion 86 (see FIG. 2) that is curved so as to be recessed on the opposite side of the bracket 7 is formed, and the fourth grip portion 86 is formed. 86 has a shape corresponding to the outer peripheral surface of the breather tube 2.

Then, in a state where the rubber member 6 is fitted into the fitting recess 72a of the bracket 7, the gripper 4 is an oil supply pipe between the first grip portion 72 of the bracket 7 and the third grip portion 85 of the cover panel 8. The main body 1c is arranged, the breather tube 2 is arranged between the second grip portion 74 of the bracket 7 and the fourth grip portion 86 of the cover panel 8, and the engagement claw 71 is engaged with the engagement hole 81a. By bringing the bracket 7 and the cover panel 8 closer to each other, the bracket 7 and the cover panel 8 sandwich and grip the oil supply pipe main body 1c and the breather pipe 2 from their respective radial directions.

When the oil supply pipe body 1c and the breather pipe 2 are gripped by the bracket 7 and the cover panel 8, the mounting bolts 9b are passed through the bolt insertion holes 84b and the elongated holes 73 in order and screwed into the mounting nuts 9a. The cover panel 8 maintains the state of gripping the oil supply pipe main body 1c and the breather pipe 2. At this time, the overhanging portion 72b is in a state of passing through the through hole 6a, and the second unpainted portion 72c is in pressure contact with the first unpainted portion 1b. Further, the first unpainted portion 1b of the refueling pipe main body 1c and the second unpainted portion 72c of the bracket 7 are positioned corresponding to the rubber member 6, and the rubber member 6 is compressed between the bracket 7 and the fuel refueling pipe 1. It is arranged in such a state that it covers the first unpainted portion 1b and the second unpainted portion 72c.

The oil supply pipe main body 1c is grounded to the vehicle body B by the first unpainted portion 1b, the second unpainted portion 72c, the mounting nut 9a, the mounting bolt 9b, the third unpainted portion 84c, and the fixing bolt 5. ing.

As shown in FIG. 5, the refueling pipe main body 1c and the retainer 1d are assembled using the assembling device 20.

The assembling device 20 includes a rotating jig 12 capable of setting the refueling pipe main body 1c and the retainer 1d with the retainer 1d fitted in the expanding portion 1e of the refueling pipe main body 1c, and a laser beam Lz excited by the laser oscillator 11. The processing head 11a (processing means) capable of irradiating the laser, the industrial robot 13 to which the processing head 11a is attached to the tip of the arm, and the control unit 14 connected to the laser oscillator 11, the rotating jig 12, and the industrial robot 13. The control unit 14 controls the output of the laser beam Lz emitted from the laser oscillator 11, the rotational operation of the rotating jig 12, and the moving operation of the industrial robot 13.

The rotary jig 12 has a rotary shaft 12a that extends in the horizontal direction and rotates in conjunction with the rotary drive of a servomotor (not shown), and the rotary shaft 12a is inserted into the retainer 1d fitted in the oil supply pipe main body 1c to rotate. By allowing the fuel pipe body 1c and the retainer 1d to rotate integrally around the center line of the cylinder of the overlapping portion.

Then, the control unit 14 outputs an operation signal to the rotary jig 12 to output an operation signal to the laser oscillator 11 while rotating the oil supply pipe main body 1c and the retainer 1d, and the laser beam Lz is output to the opening peripheral edge of the oil supply pipe main body 1c. The oil supply pipe main body 1c and the retainer 1d are connected by fillet welding by irradiating.

Further, the control unit 14 outputs an operation signal to the industrial robot 13 to move the processing head 11a close to the planned formation position of the first unpainted portion 1b, and at the same time, as shown in FIG. 6, the laser oscillator 11 is used. By outputting an operation signal and irradiating the planned formation position of the first unpainted portion 1b with a laser beam Lz from the processing head 11a to discolor the surface of the refueling pipe main body 1c, a mark portion 10b is provided on the surface of the refueling pipe main body 1c. It is designed to form. At this time, the laser beam Lz emitted from the processing head 11a has a calorific value that the plating layer 10a evaporates and the material surface of the oil supply pipe main body 1c is not exposed.

Next, the production of the fuel refueling pipe 1 will be described in detail.

As shown in FIG. 4, the production line of the fuel oil supply pipe 1 has a machining process S1, a pipe expansion process S2, a first welding assembly process S3, a bending process S4, a second welding assembly process S5, and a submersion leak inspection process S6. The pre-coating process S7, the masking process S8, the coating process S9, the baking drying process S10, the packaging assembly process S11, and the submersion leak inspection process S12 are provided in this order.

First, in the machining step S1, a cutting process for cutting each metal pipe to be the oil supply pipe main body 1c and the breather pipe 2 to a certain size and a pressing process for a steel plate to be the retainer 1d are performed.

Next, in the pipe expansion step S2, a punch mold (not shown) is press-fitted into one end side of the linear oil supply pipe main body 1c to expand the pipe expansion portion 1e.

After that, in the first welding assembly step S3, the retainer 1d is fitted into the pipe expansion portion 1e of the oil supply pipe main body 1c, and the processing head 11a attached to the arm tip portion of the industrial robot 13 is inserted as shown in FIG. The fuel pipe main body 1c and the retainer 1d are connected by fillet welding.

Further, in the first welding assembly step S3, as shown in FIG. 6, the mark portion is discolored by applying heat treatment to the planned formation position of the first unpainted portion 1b in the oil supply pipe main body 1c using the processing head 11a. Form 10b.

Next, in the bending step S4, the oil supply pipe main body 1c and the breather pipe 2 are bent and molded, respectively.

After that, in the second welding assembly step S5, one end of the breather pipe 2 is joined to the pipe expansion portion 1e of the oil supply pipe main body 1c by MIG brazing to obtain the fuel oil supply pipe 1 before painting.

After that, in the submersion leak inspection step S6, the fuel oil supply pipe 1 before painting is submerged in a state where the opening portion is closed, and the airtightness is confirmed by observing whether or not air bubbles are generated.

Next, in the pre-painting treatment step S7, the fuel refueling pipe 1 before painting is degreased and washed, then subjected to chemical conversion treatment, and then washed with water and dried.

Next, in the masking step S8, as shown in FIG. 7, the operator attaches the masking resin sealing material 10c to the mark portion 10b of the oil supply pipe main body 1c.

Then, in the coating step S9, as shown in FIG. 8, the entire surface of the oil supply pipe main body 1c is subjected to the organic coating treatment to form the coating film layer 10d.

After that, in the baking and drying step S10, the coating film layer 10d formed on the entire surface of the oil supply pipe main body 1c is cured.

After that, in the mounting assembly step S11, as shown in FIG. 9, the sealing material 10c attached to the refueling pipe main body 1c is peeled off to form the first unpainted portion 1b, and then the mounting nut 9a and the mounting bolt 9b are removed. The bracket 7 and the cover panel 8 are assembled to the fuel oil supply pipe 1 by the use.

Then, in the submersion leak inspection step S12, the fuel refueling pipe 1 to which the bracket 7 or the like is assembled is submerged in a state where the opening portion is closed, and the airtightness is confirmed by observing whether or not air bubbles are generated, and the fuel refueling is performed. The production of the tube 1 is completed.

The thicknesses of the plating layer 10a, the sealing material 10c, and the coating film layer 10d of FIGS. 6 to 9 are exaggerated.

From the above, according to the first embodiment of the present invention, the jig for fixing the oil supply pipe main body 1c required at the time of forming the mark portion 10b can be used as the jig pre-installed in the first welding assembly step S3, and the painting pretreatment step. Since it is not necessary to newly install a jig only for forming the mark portion 10b between S7 and the painting process S9, it is not necessary to wastefully expand the space of the production line, and the equipment cost can be kept low. can.

Further, since it is not necessary to modify the hanging transfer system between the painting pretreatment process S7 and the painting process S9 in a general production line, it is possible to design a production line using existing equipment.

Further, since the laser processing by the laser beam Lz emitted from the processing head 11a has a high processing speed, the forming speed of the mark portion 10b with respect to the surface of the oil supply pipe main body 1c becomes high, and the fuel oil supply pipe 1 can be efficiently manufactured. can.

Further, when the mark portion 10b is formed, the laser beam Lz emitted from the processing head 11a has a calorific value that does not expose the material surface of the refueling pipe body 1c due to the evaporation of the plating layer 10a. The plating layer 10a remains in the region corresponding to the mark portion 10b on the surface, and the material surface of the oil supply pipe main body 1c is not exposed. Therefore, the first unpainted portion 1b in the refueling pipe main body 1c after production becomes more resistant to rust, and the fuel refueling pipe 1 having high rust prevention power can be obtained.

<< 2nd Embodiment of the Invention >>
10 to 13 show a method of forming the mark portion 10b according to the second embodiment of the present invention. In the second embodiment, the processing means for forming the mark portion 10b is different from that of the first embodiment, and the other parts are the same as those of the first embodiment. Therefore, only the parts different from the first embodiment will be described in detail below.

In the second embodiment, the discharge coating torch 15 (processing means) is used to form the mark portion 10b on the oil supply pipe main body 1c. That is, in the first welding assembly step S3 of the second embodiment, the industrial robot 13a to which the discharge coating torch 15 is attached to the tip of the arm is arranged, and the oil supply pipe is rotated while rotating the electrode material 15a of the discharge coating torch 15. The surface of the oil supply pipe main body 1c is discolored to form the mark portion 10b by rubbing and transferring the first unpainted portion 1b on the main body 1c to the planned formation position.

The mark portion 10b in the second embodiment is formed in the first welding assembly step S3. Therefore, the manufacturing process of the fuel oil supply pipe 1 is the same as that of the first embodiment except that the processing means for forming the mark portion 10b is different, and therefore detailed description thereof will be omitted.

Further, the thicknesses of the plating layer 10a, the sealing material 10c, and the coating film layer 10d of FIGS. 10 to 13 are exaggerated.

From the above, according to the second embodiment of the present invention, since the mark portion 10b can be formed without using the laser oscillator 11 having a high running cost as in the first embodiment, the fuel refueling pipe 1 can be manufactured while keeping the cost low. can do.

In the first and second embodiments of the present invention, the mark portion 10b is formed in the first welding assembly process S3, but the present invention is not limited to this, and the machining process S1, the pipe expansion process S2, the bending process S4 and the second The structure may be such that the mark portion 10b is formed in the welding assembly step S5.

<< Embodiment 3 of the invention >>
14 to 17 show a method of forming the mark portion 10b according to the third embodiment of the present invention. In the third embodiment, the processing means for forming the mark portion 10b and a part of the steps in the production line are different from those of the first embodiment, and the others are the same as those of the first embodiment. Therefore, the following is different from the first embodiment. Only the part will be described in detail.

In the third embodiment, the mark portion 10b is formed on the oil supply pipe main body 1c by using the welding torch 16 (processing means) capable of MIG brazing. That is, in the second welding assembly step S5 of the third embodiment, the industrial robot 13b to which the welding torch 16 is attached to the tip of the arm is arranged, and the lower is at the position where the first unpainted portion 1b is planned to be formed in the oil supply pipe main body 1c. The mark portion 10b is formed by adhering the material 16a and overlaying the material.

Then, as shown in FIGS. 16 and 17, the first non-painted portion 1b is subjected to an organic film treatment over the entire surface of the oil supply pipe main body 1c, and then the coating corresponding to the mark portion 10b is applied in the mounting assembly step S11. It is formed by polishing the film layer 10d to expose the mark portion 10b.

The thicknesses of the plating layer 10a, the mark portion 10b, and the coating film layer 10d of FIGS. 15 to 17 are exaggerated.

Next, the production of the fuel refueling pipe 1 will be described in detail. In the third embodiment, there is no masking step S8 as in the first embodiment, and some of the work contents of the first welding assembly step S3, the second welding assembly step S5, and the mounting assembly step S11 are different. Since it is the same as the first embodiment except for the above, only the different parts will be described in detail.

In the first welding assembly step S3 of the third embodiment, the mark portion 10b is not formed by using the processing head 11a as in the first embodiment.

In the second welding assembly step S5 of the third embodiment, as shown in FIG. 15, refueling is performed by using a welding torch 16 for MIG brazing for joining one end of the breather pipe 2 to the pipe expansion portion 1e of the refueling pipe main body 1c. The mark portion 10b is formed by adhering the brazing material 16a to the planned formation position of the first unpainted portion 1b on the pipe body 1c and overlaying the brazing material 16a.

Then, in the coating step S9, as shown in FIG. 16, an organic film treatment is applied over the entire surface of the oil supply pipe main body 1c to form the coating film layer 10d, and then in the baking drying step S10, the surface of the oil supply pipe main body 1c is formed. The coating film layer 10d formed over the entire area is cured. After that, in the mounting assembly step S11, as shown in FIG. 17, the coating film layer 10d corresponding to the mark portion 10b in the oil supply pipe main body 1c is polished to expose the mark portion 10b to form the first unpainted portion 1b. .. After that, the fuel refueling pipe 1 is completed through the submersion leak inspection step S12.

From the above, according to the third embodiment of the present invention, when the mark portion 10b is formed, the region of the mark portion 10b on the surface of the oil supply pipe main body 1c rises and becomes more conspicuous than the other regions, so that the mark portion 10b can be visually recognized. The sex improves. Therefore, the need for the masking step S8 in which the sealing material 10c is attached to the mark portion 10b as in the first and second embodiments is eliminated, and the work efficiency of manufacturing the fuel oil supply pipe 1 can be further improved.

In the third embodiment of the present invention, the mark portion 10b is formed in the second welding assembly process S5, but the present invention is not limited to this, and the machining process S1, the pipe expansion process S2, the first welding assembly process S3 and bending are not limited to this. The structure may be such that the mark portion 10b is formed in the step S4.

Further, in the first to third embodiments of the present invention, the refueling pipe main body 1c and the retainer 1d are connected by fillet welding using the processing head 11a, but the present invention is not limited to this, and the refueling pipe is not limited to this, and the refueling pipe 16 is used. The main body 1c and the retainer 1d may be connected by MIG brazing.

Further, in the first to third embodiments of the present invention, the mark portion 10b is formed on the refueling pipe main body 1c having the plating layer 10a on the surface, but the refueling pipe main body 1c without the plating layer 10a on the surface also has the present invention. The mark portion 10b can be formed by using the manufacturing method.

The present invention is suitable for a method of manufacturing a fuel refueling pipe that is fixed to a vehicle body using a fixture.

1 Fuel refueling pipe 1b 1st unpainted part 1c Refueling pipe body 3 Fixture 10a Plating layer 10b Marking part 10c Sealing material 10d Coating film layer 11 Laser oscillator 11a Processing head (processing means)
13, 13a, 13b Industrial robot 15 Discharge coating torch (processing means)
16 Welding torch (processing means)
B body Lz laser beam

Claims (5)

A metal fuel refueling pipe with a non-conductive coating on the surface, fixed to the vehicle body using a fixture, and having a non-painted portion for grounding the vehicle body at a position corresponding to the fixture. It ’s a manufacturing method,
When obtaining a refueling pipe body from a metal pipe through a machining process, a pipe expanding process, a bending process, and a welding assembly process, a processing means attached to the arm tip of an industrial robot is used to cover the unpainted part of the refueling pipe body. Heat treatment is applied to the planned formation position to discolor it, or overlay welding is performed to form a mark portion.
Next, the above oil supply pipe body is subjected to pre-painting treatment.
After that, a sealing material is attached to the mark portion, and a non-conductive coating is applied over the entire surface of the oil supply pipe main body, and then the sealing material is peeled off from the oil supply pipe main body to form the non-painted portion. Alternatively, after applying a non-conductive coating over the entire surface of the refueling pipe main body, the coated portion corresponding to the marking portion is polished to expose the marking portion to form the non-painted portion. A method of manufacturing a fuel filler pipe, which is characterized by the fact that the fuel filler pipe is manufactured. In the method for manufacturing a fuel refueling pipe according to claim 1,
The processing means is a processing head capable of irradiating a laser beam excited by a laser oscillator.
The mark portion is formed by discoloring the surface of the oil supply pipe main body by the heat of the laser beam emitted from the processing head, and then a sealing material is attached to the mark portion and non-conductive on the surface of the oil supply pipe main body. A method for manufacturing a fuel refueling pipe, which comprises peeling off the sealing material from the refueling pipe main body to form the non-painted portion after applying the sexual coating. In the method for manufacturing a fuel refueling pipe according to claim 2.
The refueling pipe body has a plating layer on its surface.
The laser oscillator is a method for manufacturing a fuel fuel pipe, characterized in that the plating layer is controlled to irradiate a laser beam having a calorific value that does not expose the material surface of the fuel pipe body from the processing head. In the method for manufacturing a fuel refueling pipe according to claim 1,
The processing means is a discharge coating torch.
The mark portion is formed by transferring the electrode material of the discharge coating torch to the surface of the refueling pipe main body and discoloring the surface of the refueling pipe main body, and then a sealing material is attached to the mark portion and the refueling is performed. A method for manufacturing a fuel refueling pipe, which comprises applying a non-conductive coating to the surface of a pipe body, and then peeling off the sealing material from the refueling pipe body to form the non-painted portion. In the method for manufacturing a fuel refueling pipe according to claim 1,
The processing means is a welding torch that can be brazed with MIG.
The mark portion is formed by adhering the brazing material of the welding torch to the surface of the fuel pipe main body and overlaying the surface, and then a non-conductive coating is applied over the entire surface of the fuel pipe main body. A method for manufacturing a fuel oil supply pipe, which comprises polishing a painted portion corresponding to the mark portion to expose the mark portion to form the unpainted portion.

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