JP6025492B2 - Manufacturing method of fuel supply pipe - Google Patents

Description

The present invention relates to a method of manufacturing a fuel supply pipe that serves as a passage when fuel such as gasoline is supplied to a fuel tank of a vehicle.

  Conventionally, for example, as disclosed in Patent Document 1, a vehicle has been provided with a fuel supply pipe serving as a passage when fuel is supplied to a fuel tank, and the fuel supply pipe has a female inner peripheral surface. A cylindrical fuel supply pipe body having a fuel supply port formed with a screw portion at one end and the other end connected to a fuel tank, and a short cylindrical retainer assembled to the fuel supply port are provided.

  By the way, when the material of the oil supply pipe body is made of steel, as a general manufacturing method, after forming one end of an unplated steel pipe by expanding and forming the oil supply pipe body, a short cylindrical retainer made of steel is used as an oil supply pipe. After press-fitting into the expanded portion of the main body from the opening side, then spot welding the overlapped portion of the expanded portion and the retainer, and then forming a female screw portion for the oil supply cap on the open end side of the expanded portion, A manufacturing method is known in which the entire oil supply pipe body is plated together with a retainer to form a plated layer.

  However, in this manufacturing method, for example, when electroplating is performed, an electrode extending over the entire length of the oil supply pipe main body along the cylinder center of the oil supply pipe main body is necessary, and the plating process is difficult and the equipment is expensive. Cost. Further, when electroless chromium plating is performed, a processing liquid tank is required for immersing the entire fuel supply pipe in the processing liquid, and the amount of the processing liquid used is large and the cost is increased. Furthermore, since the plating layer is not formed in the overlapped portion of the oil supply pipe main body and the retainer, there is a possibility that the rust preventive power around the retainer may be reduced.

  In order to avoid this, a method of manufacturing a fuel supply pipe by previously forming a plating layer on both the supply pipe main body and the retainer can be considered. According to this method, since it is not necessary to perform plating after the retainer is assembled to the expanded portion of the oil supply pipe body, the equipment becomes inexpensive, and a plating layer is interposed in the overlap portion of the expanded portion of the oil supply pipe body and the retainer. As a result, the rust prevention power around the retainer increases.

JP 2010-12893 (paragraphs 0011 to 0017 and FIG. 2)

  However, in the case of the latter manufacturing method, when one end of a steel pipe having a plating layer is expanded and formed, or when a female screw portion for an oil supply cap is formed in the expanded portion of the steel pipe having a plating layer, contact resistance with the forming die Peeling of the plating layer occurs due to adhesion of red rust due to this and the occurrence of unevenness due to corrosion, which makes the appearance worse, and it becomes impossible to maintain airtightness when the oil filler cap is covered with the oil filler cap There is a fear. In addition, the plating layer at the expanded portion is stretched by the expanded tube forming to reduce the thickness, and there is a possibility that the necessary rust preventive power around the oil filler port cannot be obtained.

  The present invention has been made in view of such a point, and the object of the present invention is to provide an inexpensive fuel supply that can provide the necessary rust prevention power around the filler opening and can prevent the occurrence of rust and corrosion. It is to provide a pipe and a method for manufacturing the same.

  In order to achieve the above-mentioned object, the present invention forms an oil supply pipe body from a steel pipe having a plating layer, and after the retainer is assembled to the oil supply pipe body, the plating adhering around the oil supply opening is pickled once. The plating process is performed again.

Specifically, has the feed oil port at one end, includes a cylindrical fill tube body and the other end is connected to the fuel tank, and a short tubular retainer made of steel is assembled to one end of the oil supply pipe main body , a female screw portion on at least one of one end and the retainer of the oil supply pipe main body is formed, during non-refueling the fuel supply port by screwing the upper Kimesu threaded portion of the male screw portion of the fuel supply cap has lidding In refueling , the following solution was taken for a method of manufacturing a fuel refueling pipe in which a nozzle of a refueling gun was inserted into the refueling port .

That is, in the first invention, one end of a steel pipe having a first plating layer made of galvanized on the outer peripheral surface and inner peripheral surface and bulge forming to form the oil supply pipe main body, then the fill pipe body the retainer Press-fitted into the expanded pipe part from the opening side, weld a part of the overlapped part of the expanded pipe part and the retainer, and then form the female screw part on at least one of the expanded pipe part and the retainer, and then after one end of the oil supply pipe main body to remove the first plating layer other than the overlapped portion between the expanded pipe portion and the retainer in the pickling positions by the pickling process with the retainer, electroless nickel to the pickling portion and forming a second plating layer made of electroless nickel plating and the plating process.

According to a second invention, in the first invention, after the pickling treatment of the oil supply pipe body, a metal powder is applied to a boundary portion between the portion subjected to the electroless nickel plating process and the first plating layer of the oil supply pipe body. It is characterized by the undercoating that it contains.

According to a third invention, in the first or second invention, the retainer press-fitted into the expanded portion of the oil supply pipe body has a first plating layer at least on the outer peripheral surface .

In the first invention, since the pickling process is performed in a state where the retainer is assembled to the expanded portion of the oil supply pipe body having the first plating layer, the first plating layer other than the overlapping portion of the expanded portion of the oil supply pipe body and the retainer is provided. Removed. Therefore, when the pickling treatment portion is plated, the second plating layer remains on the surface of the pickling treatment portion while the first plating layer previously attached to the oil supply tube main body remains in the overlapped portion of the oil supply tube main body and the retainer. Since the plating layer is formed, the rust prevention power around the retainer can be enhanced. In addition, after the pipe expansion of the oil supply pipe body and the formation of the female thread portion on the pipe expansion portion, the pickling portion is plated after the pickling treatment to form the second plating layer. The state where the first plating layer has been peeled off around the oil filler port and the state where the thickness of the first plating layer is still thin can be prevented, and the occurrence of rust and corrosion around the oil filler port can be prevented. In addition, it is possible to obtain the necessary rust preventive power around the oil filler opening. Furthermore, since the plating process after the pickling process is performed only around the fuel filler opening, the equipment can be made cheaper than the case where the plating process is performed on the entire fuel supply pipe.

  In 2nd invention, when forming a 2nd plating layer in the pickling process location around an oil filler opening, in the boundary part of the location where the 2nd plating layer was formed, and the 1st plating layer adhering to an oil supply pipe body beforehand Even when the first and second plating layers are not present, the boundary portion is not coated and pickled, and thus the rust preventive power of the entire fuel supply pipe can be further increased.

  In the third aspect of the invention, the thickness of the first plating layer interposed between the expanded portion of the oil supply pipe body and the retainer is increased by the amount of the first plating layer adhering to the retainer. The power can be further increased.

It is a perspective view of a fuel supply pipe, a fuel tank, and a fuel supply cap concerning an embodiment of the present invention. (A) is sectional drawing in the AA of FIG. 1, (b) is the B section enlarged view of (a), (c) is the C section enlarged view of (a). (A) is a shaping | molding die which expands and forms a steel pipe and forms an oil supply pipe main body, (b) is the D section enlarged view of (a). It is explanatory drawing which shows the point which sets the oil supply pipe main body to which the retainer was attached to a shaping | molding die, and forms an internal thread part in an oil supply pipe main body. It is a figure which shows the state which has plated on the pipe expansion part of the oil supply pipe main body.

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

  1 and 2 show a fuel supply pipe 1 according to an embodiment of the present invention. The fuel supply pipe 1 serves as a fuel passage when fuel is supplied to a fuel tank 10 of a vehicle, and has a fuel supply port 2a having an internal thread portion 2b formed on an inner peripheral surface at one end. A cylindrical fuel supply pipe body 2 whose end is connected to the fuel tank 10, a short cylindrical retainer 3 assembled to the fuel supply port 2a, and air containing fuel vapor from the fuel tank 10 when fuel is supplied. A thin cylindrical breather tube 4 is provided to be pulled out to one end side of the oil supply pipe body 2. The fuel supply pipe 1 is covered with the oil supply port 2a by screwing the male screw portion 5a of the oil supply cap 5 with the female screw portion 2b of the oil supply port 2a when not refueling. A nozzle G1 of the gun G is inserted into the fuel filler port 2a.

  The oil supply pipe body 2 is formed by using a galvanized steel pipe 20, and a pipe expansion portion 20a is formed at one end thereof by a pipe expansion mold 8 shown in FIG.

  Further, near the one end of the oil supply pipe body 2, the female thread portion 2b is formed by a threading mold 9 shown in FIG. 4, and at one end opening edge of the oil supply pipe body 2, a curl mold (not shown) is formed. An annular seal portion 2c having a substantially circular cross section is formed.

  The retainer 3 is formed by pressing a non-plated steel material. The retainer 3 is press-fitted into the pipe expansion portion 20a from the opening side, and a part of the overlapped portion with the pipe expansion portion 20a is spot welded SW, whereby the oil supply is performed. The tube body 2 is assembled.

  The half of the retainer 3 on the counter press-fitting side has a substantially bowl shape that gradually decreases in diameter toward the counter press-fitting side, and the counter press-fitting side opening end is smaller than the press-fitting side opening end, so that the fuel gun G The nozzle G1 constitutes an insertion hole 3a into which insertion and extraction are possible.

Then, one end side of the oil supply pipe main body 2 is subjected to pickling treatment together with the retainer 3, and then subjected to electroless nickel plating at the pickling treatment portion, as shown in FIGS. 2 (b) and 2 (c). In addition, the inner peripheral surface and the outer peripheral surface of the oil supply pipe main body 2 other than the pickled portion, and the expanded portion 20a and the overlapped portion of the retainer 3 are first plated made of zinc plating previously attached to the steel tube 20. The layer 6 is provided, and the outer peripheral surface of the pickled portion of the oil supply pipe body 2, the inner peripheral surface of the retainer 3, and the expanded portion 20a and the non-polymerized portion of the retainer 3 are electroless nickel plated. the second plating layer 7 is provided consisting of electroless nickel plating Ri formed by the.

  A gap extending in the direction of the center of the cylinder (not shown) is formed between the oil supply pipe body 2 and the retainer 3, and the oil supply pipe body 2 and the retainer 3 are taken out from the processing liquid after degreasing and pickling. In this case, the processing liquid does not accumulate between the oil supply pipe body 2 and the retainer 3.

  As shown in FIG. 3, the tube expansion mold 8 includes a tube expansion clamp die 8 a having a molding surface 8 c inside, and a tube expansion punch 8 b having a tapered tip portion, and the tube expansion punch 8 b includes the tube expansion punch 8 b. It is possible to advance and retreat with respect to the space surrounded by the molding surface 8c of the clamping mold 8a.

  Further, as shown in FIG. 4, the threading mold 9 includes a first threading die 9a having a ridge portion 9c formed in a spiral shape on the inner peripheral surface, and the ridge portion 9c on the outer peripheral surface. And a second threaded die 9b having a concave groove 9d corresponding to the second threaded die 9b. The second threaded die 9b is rotatable around the center of the cylinder on one end side of the oil supply pipe body.

  Next, a method for manufacturing the fuel supply pipe 1 will be described.

  First, as shown in FIG. 3, one end side of the steel pipe 20 having the first plating layer 6 on the outer peripheral surface and the inner peripheral surface is sandwiched between the tube expansion clamp mold 8 a and the tube expansion punch 8 b is connected to one end of the steel tube 20. The tube expansion part 20a along the molding surface 8c is formed by pushing into the tube.

  Next, the retainer 3 is press-fitted into the expanded portion 20a of the oil supply pipe main body 2 from the opening side, and the overlapped portion between the expanded portion 20a and the retainer 3 is subjected to spot welding SW.

  Next, as shown in FIG. 4, one end side of the oil supply pipe body 2 is connected to the first threaded mold 9 a in a state where the second threading mold 9 b is inserted into one end side of the oil supply pipe body 2 from the opening side. Then, the second thread cutting die 9b is rotated to be pulled out from the fuel supply pipe body 2.

  Thereafter, the one end opening edge of the oil supply pipe body 2 is curled to form an annular seal portion 2c having a substantially circular cross section at the one end opening edge of the oil supply pipe body 2.

  Thereafter, the one end side of the oil supply pipe body 2 is degreased and washed together with the retainer 3, then pickled, and then electrolytically washed.

  And as shown in FIG. 5, the pickling process location of the said oil supply pipe main body 2 and the retainer 3 is immersed in the process liquid W, and an electroless nickel plating process is carried out, and the 2nd plating layer 7 is formed in the said location.

  Thereafter, the boundary portion between the electroless nickel plating portion (the portion where the second plating layer 7 is formed) of the oil supply pipe body 2 and the first plating layer 6 of the oil supply pipe body 2 (FIG. 5). The fuel oil supply pipe 1 is coated with an organic coating on the surfaces of the oil supply pipe body 2 and the retainer 3 and bent to form the oil supply pipe body 2. Complete.

As described above, according to the embodiment of the present invention, the pickling process is performed in a state in which the retainer 3 is assembled to the expanded pipe portion 20a of the oil supply pipe body 2 having the first plating layer 6, and therefore the expanded pipe portion 20a of the oil supply pipe body 2 and the retainer. The first plating layer 6 other than the portion overlapped with 3 is removed. Therefore, when the pickling treatment portion is plated, the pickling treatment portion with the first plating layer 6 previously attached to the oil supply pipe body 2 remaining in the overlapping portion of the pipe expansion portion 20a and the retainer 3 of the oil supply pipe main body 2 remains. Since the 2nd plating layer 7 is formed in the surface of this, the rust prevention power around the retainer 3 can be improved. In addition, after the oil pipe main body 2 is expanded and the female screw portion 2b is formed on the expanded portion 20a, the pickling portion is plated after the pickling to form the second plating layer 7. The first plating layer 6 is not peeled off around the oil filler port 2a by molding or threading, and the first plating layer 6 is not thinned. The occurrence of corrosion and corrosion can be prevented, and the necessary rust prevention power can be obtained around the oil filler opening 2a. Furthermore, since the plating process after the pickling process is performed only around the fuel filler port 2a, the equipment can be made cheaper than the case where the plating process is performed on the entire fuel filler pipe 1.

  Moreover, when forming the 2nd plating layer 7 in the pickling process location around the oil filler 2a, the boundary part of the location where the 2nd plating layer 7 was formed, and the 1st plating layer 6 adhering to the oil supply pipe main body 2 previously Even if the first and second plating layers 6 and 7 are not present, the boundary portion is not coated and pickled, and thus the rust preventive power of the entire fuel supply pipe 1 is further increased. Can be increased.

  In the embodiment of the present invention, the retainer 3 is formed by pressing a non-plated steel material, and the outer peripheral surface and the inner peripheral surface are in a non-plated state. Both the peripheral surfaces may have the first plating layer 6 or only the outer peripheral surface may have the first plating layer 6. That is, if the first plating layer 6 is provided at least on the outer peripheral surface of the retainer 3, the thickness of the first plating layer 6 interposed in the overlapping portion of the expanded portion 20 a of the oil supply pipe body 2 and the retainer 3 is determined by the retainer 3. Therefore, the rust preventive power around the oil filler opening 2a can be further increased.

  Moreover, in embodiment of this invention, between the 2nd plating layer 7 formed by the electroless nickel plating process after the pickling process of the said oil supply pipe main body 2, and the 1st plating layer 6 of the said oil supply pipe main body 2 Although the undercoating which contains metal powder is applied to the boundary part, it is not essential to perform the undercoating.

  Moreover, in embodiment of this invention, although the internal thread part 2b is formed in the pipe expansion part 20a of the oil supply pipe main body 2, you may form the internal thread part 2b in the retainer 3 not only in this, but a pipe expansion The female screw portion 2b may be formed at the overlapping portion of the portion 20a and the retainer 3, and the female screw portion 2b may be formed at least one of the tube expansion portion 20a and the retainer 3.

  Moreover, when pickling the expanded pipe portion 20a of the oil supply pipe body 2 together with the retainer 3, it is not necessary to remove all of the first plating layer 6 adhering in advance, and even if the first plating layer 6 remains, the surface of the first plating layer 6 remains. It only needs to be activated to such an extent that the second plating layer 7 can be formed.

  In the embodiment of the present invention, the oil supply pipe body 2 and the retainer 3 are integrated by spot welding SW. However, the present invention is not limited thereto, and may be integrated by TIG welding or MIG welding, or integrated by laser welding. It doesn't matter the type of welding.

Also, the steel pipe 20 used in the production of the oil supply pipe main body 2 may be a electric resistance welded steel pipe with a welded its seam round the plate-shaped steel sheet into a tubular shape, it may be a forge welding steel pipes.

  The present invention is suitable for a fuel supply pipe serving as a passage when fuel such as gasoline is supplied to a fuel tank of a vehicle and a method for manufacturing the same.

DESCRIPTION OF SYMBOLS 1 Fuel supply pipe 2 Oil supply pipe body 2a Oil supply port 2b Female thread part 3 Retainer 5 Oil supply cap 5a Male thread part 6 1st plating layer 7 2nd plating layer 10 Fuel tank 20 Steel pipe 20a Expanded part G Oil supply gun G1 Nozzle SW Spot welding

Claims (3)

Has a supply oil inlet at one end, a cylindrical filler tube body and the other end is connected to the fuel tank,
A short cylindrical retainer made of a steel material assembled to one end of the oil supply pipe body ;
A female screw part is formed on at least one of the one end side of the oil supply pipe body and the retainer,
During non-refueling the fuel supply port is lidding by screwing the upper Kimesu threaded portion of the male screw portion of the fuel cap, the manufacture of fuel filler tube nozzle of the fueling gun is inserted into the fuel supply port. Before refueling A method,
One end of the steel pipe having a first plating layer made of galvanized on the outer peripheral surface and inner peripheral surface and bulge forming to form the oil supply pipe main body,
Next, the retainer is press-fitted into the expanded portion of the oil supply pipe body from the opening side, and a part of the overlapped portion of the expanded portion and the retainer is welded.
Thereafter, the female thread portion is formed on at least one of the expanded pipe portion and the retainer,
Thereafter, one end side of the oil supply pipe main body after removing the first plating layer other than the overlapped portion between the expanded pipe portion and the retainer in the pickling positions by the pickling process with the retainer, in the pickling portion method for manufacturing a fuel oil supply pipe and forming a second plating layer consisting of an electroless nickel plating with an electroless nickel plating process. In the manufacturing method of the fuel supply pipe according to claim 1,
After the pickling treatment of the fuel supply pipe body, a fuel supply is characterized in that an undercoat coating containing a metal powder is applied to a boundary portion between a portion subjected to electroless nickel plating and the first plating layer of the fuel supply pipe body A method of manufacturing a tube. In the manufacturing method of the fuel supply pipe according to claim 1 or 2,
The method of manufacturing a fuel supply pipe according to claim 1, wherein the retainer press-fitted into the expanded portion of the fuel supply pipe main body has a first plating layer on at least an outer peripheral surface.

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