JP6552174B2 - Mig brazing apparatus and Mig brazing method - Google Patents

Description

  The present invention relates to a mig brazing apparatus and mig brazing apparatus in which the continuous portion is connected by mig brazing in a state in which the entire outer peripheral surface on one end side of one of two metal cylindrical members is continued to the outer peripheral surface of the other. It relates to the attaching method.

  2. Description of the Related Art Conventionally, when assembling an automobile part, one of the two metal cylinder members is connected to the entire outer peripheral surface of one end side with the other outer peripheral surface. For example, the fuel supply pipe disclosed in Patent Document 1 is provided with a breather tube for extracting air containing fuel vapor from the fuel tank to the supply pipe main body, and the breather tube has one end side of the fuel supply pipe main body It is common to be connected to the filler pipe main body by inserting in the through hole formed in and forming an annular brazing part on the continuous part of the outer peripheral surface of the filler pipe and the peripheral surface of the breather tube by Mig brazing. .

JP 2012-91534 A

  By the way, immediately after the start of brazing in Mig brazing, the arc generated between the brazing material and the continuous portion of the outer peripheral surface of the feed pipe body and the outer peripheral surface of the breather tube is unstable and the arc heat is low. As shown in FIG. 3, the adhesion of the brazing material W to the continuous portion 16 may be incomplete, and a fine gap S may be generated between the continuous portion 16 and the brazed portion 17. Then, even if the brazing end portion is superimposed on the brazing start portion R to form the annular brazing portion 17, a minute gap is generated between the brazing start portion R of the brazing portion 17 and the continuous portion 16. Even if S remains, and the brazed portion 17 is in a healthy state on the appearance, the gap S cannot maintain airtightness.

  This invention is made in view of such a point, and the place made into the purpose is Mig brazing to the perimeter surface of the other end of one end side of one of two metal cylinder members. When connecting, it is in ensuring high airtightness in a brazing part.

  In order to achieve the above object, the present invention is characterized in that the temperature of the brazing start region is raised in advance immediately before the start of brazing.

  Specifically, it has a brazing torch capable of delivering a wire-like brazing material, and the entire outer peripheral surface of one end side of the metal first cylindrical member is continuous with the outer peripheral surface of the metal second cylindrical member. The brazing material is delivered from the brazing torch to the continuous portion of the first and second cylindrical members, and an arc is generated between the continuous portion and the brazing material to generate the brazing material. The following solution is provided in a MIG brazing apparatus in which an annular brazing portion is formed along the continuous portion by adhering along the continuous portion while melting, and the first and second cylindrical members are connected to each other. I took it.

That is, in the first aspect of the invention, the heating means for preheating the brazing start area in the continuous portion is provided on the side of the brazing torch, and the heating of the brazing start area is performed. After completion, with the heating of the brazing start region stopped by the heating means, the brazing material is delivered from the brazing torch to the continuous portion, and the continuous portion and the continuous portion An arc is generated between the solder and the brazing material, and the brazing material is melted and attached along the continuous portion to form an annular brazing portion along the continuous portion, thereby forming the first and second cylindrical members. Are connected to each other .

A second invention is characterized in that in the first invention, the heating means is a near infrared irradiator which emits near infrared radiation .

Also, the present invention is to provide a continuous portion of the metallic first cylindrical member at one end the outer peripheral surface all around the metallic second tubular member said first and second tubular members in a state of being continuous with the outer peripheral surface of the By feeding a wire-like brazing material from the brazing torch and generating an arc between the continuous portion and the brazing material, the molten brazing material adheres along the continuous portion and The following solution was taken for a MIG brazing method in which the first and second cylindrical members are connected to each other by forming an annular brazing portion along the continuous portion.

That is, the third invention includes a MIG brazing step of forming the brazing portion after the brazing start region in the continuous portion is preheated by the heating means, and the MIG brazing step includes the brazing step. After the heating of the brazing start area is completed, the brazing material is delivered from the brazing torch to the continuous portion without heating the brazing start area by the heating means, and An arc is generated between the continuous portion and the brazing material to adhere along the continuous portion while melting the brazing material, thereby forming an annular brazing portion along the continuous portion to form the first brazing material. And a step of connecting the second cylindrical members to each other .

A fourth invention is characterized in that in the third invention, the brazing start region in the continuous part is irradiated with near infrared rays and heated .

In the first and third inventions, when an arc is generated between the brazing start area and the brazing material in the continuous portion of the first and second cylindrical members, the temperature of the brazing start area of the continuous portion is previously high. Since it will be in the state, the brazing material melted by arc heat is likely to be in close contact (penetration) to the above-mentioned continuous part. Therefore, even when the arc is unstable and the heat of arc is low, as in the beginning of brazing, the temperature of the start of brazing in the above-mentioned continuous part is not sufficiently high if the heat of arc alone is the above-mentioned continuous part A gap does not occur between the brazing start area and the brazing portion, and high airtightness can be secured for the brazed portion.

  In the second and fourth inventions, only the outer peripheral surfaces of the first and second cylindrical members are heated by near infrared rays, so that the region of the continuous portion that is pre-heated is deformed by excessive heat input. The first and second cylinder members can be connected with high accuracy.

It is a perspective view of a fueling pipe assembled with a MIG brazing device according to an embodiment of the present invention, a fuel tank to which the fueling pipe is connected, and a fueling cap which has a fueling port. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the Mig brazing apparatus which concerns on embodiment of this invention. FIG. 2 is a view corresponding to an arrow A in FIG. 1 and shows a state immediately before starting MIG brazing. FIG. 2 is a view corresponding to an arrow A in FIG. 1 and shows a state immediately after starting MIG brazing. FIG. 2 is a view corresponding to an arrow A in FIG. 1 and shows a state immediately after the end of the MIG brazing. (A) is a figure which shows the state immediately after starting MIG brazing using the conventional MIG brazing apparatus, (b) is the B section enlarged view of (a).

  Hereinafter, embodiments of the present invention will be described in detail based on the drawings. The following description of the preferred embodiments is merely exemplary in nature.

  FIG. 1 shows a fuel tank 20 of a vehicle and a fuel supply pipe 1 serving as a passage for supplying fuel to the fuel tank 20. The fuel supply pipe 1 has one end side expanded in diameter, and the other A substantially circular cylindrical metal fueling pipe main body 2 (second cylindrical member) whose end is connected to the fuel tank 20, and a substantially circular short cylindrical retainer fitted in the enlarged diameter portion of the fueling pipe main body 2 3 is provided.

  One end of the retainer 3 constitutes the fuel supply port 3b of the fuel supply pipe 1, while the other end of the retainer 3 is shaped so as to gradually decrease in diameter toward the end (see FIG. 2). .

  A female spiral portion 3c screwed with the male spiral portion 11a of the fueling cap 11 is formed on one end side inner peripheral surface of the retainer 3, and the fueling port 3b is covered with the fueling cap 11 so as to be opened and closed. The nozzle of the refueling gun (not shown) is inserted.

  A narrow cylindrical metal breather tube 4 (one end connected to the side of the retainer 3 of the fuel supply pipe main body 2) and the other end connected to the fuel tank 20 on the side of the fuel supply pipe main body 2 1 cylinder member) is arranged in parallel, and the breather tube 4 draws air containing fuel vapor accumulated in the fuel tank 20 to one end side of the fuel supply pipe body 2.

  The oil supply pipe body 2 and the breather tube 4 are assembled by the MIG brazing apparatus 10 according to the embodiment of the present invention.

  As shown in FIGS. 2 and 3, the MIG brazing apparatus 10 includes a brazing torch 5 capable of delivering a wire-like brazing material 5d, at least one of the feeding pipe main body 2 and the breather tube 4 and the above. A welding power source 6 capable of applying a voltage to the brazing material 5d, and a near infrared irradiator 7 (heating means) disposed on the side of the brazing torch 5 and capable of irradiating a near infrared ray H A manipulator 8 capable of holding the brazing torch 5 and the near-infrared irradiator 7 to move the positions of the brazing torch 5 and the near-infrared irradiator 7, and the brazing torch 5; A control panel 9 connected to the welding power source 6, the near-infrared irradiator 7 and the manipulator 8 and outputting an operation signal to the devices is provided.

  For example, a halogen heater is used for the near-infrared irradiator 7 of the present invention.

  The fueling pipe main body 2 and the breather tube 4 are fixed by a fixing jig (not shown), and one end of the breather tube 4 is inserted into the through hole 2a formed on one end of the fueling pipe main body 2, The one end side outer peripheral surface of the breather tube 4 is in a state of being continuous with the outer peripheral surface of the oil supply pipe body 2.

  The brazing torch 5 includes a columnar torch body 5a, and a cylindrical torch nozzle 5b is mounted on the tip side of the torch body 5a.

  The base end side of the contact tip 5c for guiding the brazing material 5d is screwed and connected to the center of the tip of the torch main body 5a, and the torch nozzle 5b surrounds the contact tip 5c.

  The manipulator 8 moves the tip of the brazing material 5 d of the brazing torch 5 and the irradiation position Z of the near-infrared irradiator 7 along the continuous portion 12 of the filler pipe 2 and the breather tube 4. The brazing torch 5 and the near infrared irradiator 7 are rotated around a center line C on one end side of the tube 4.

  The control panel 9 controls the brazing material delivery operation of the brazing torch 5, the voltage value of the welding power source 6, the near-infrared radiation amount of the near-infrared irradiator 7, and the moving operation of the manipulator 8. It has become.

  As shown in FIG. 3, the control panel 9 outputs an operation signal to the near infrared irradiator 7 to preheat the brazing start region R in the continuous portion 12.

  Further, as shown in FIG. 4, the control panel 9 outputs a stop signal to the near-infrared irradiator 7 to stop the heating of the brazing start region R, and to the brazing torch 5. The operation signal is output to send the brazing material 5d from the brazing torch 5 to the continuous portion 12, and the operation signal is output to the welding power source 6 to transmit the continuous portion 12 and the brazing material 5d. The arc is generated by applying a voltage between them.

  Furthermore, as shown in FIG. 5, the control panel 9 outputs the operation signal to the manipulator 8 to move the brazing torch 5 and the near-infrared irradiator 7 so as to be melted by arc heat. The material 5d is attached along the continuous portion 12 to form an annular brazing portion 13 along the continuous portion 12 so as to connect the fuel supply pipe main body 2 and the breather tube 4 to each other.

  Next, assembly of the oil supply pipe body 2 and the breather tube 4 by the MIG brazing apparatus 10 will be described.

  First, an operator inserts one end of the breather tube 4 into the through hole 2a of the fuel supply pipe main body 2 and fixes the fuel supply pipe main body 2 and the breather tube 4 with a fixing jig (not shown).

  Next, the operator presses a brazing start button (not shown). Then, the control panel 9 outputs an operation signal to the near-infrared irradiator 7, and based on the signal, the near-infrared irradiator 7 is placed in the brazing start region R in the continuous portion 12 as shown in FIG. The region R is heated in advance by irradiating the near infrared ray H.

  Next, the control panel 9 outputs a stop signal to the near infrared irradiator 7, and the near infrared irradiator 7 stops heating the brazing start region R based on the signal.

  Thereafter, the control panel 9 outputs an operation signal to the brazing torch 5 to send the brazing material 5d from the brazing torch 5 to the continuous portion 12, and to the welding power source 6 An arc is generated by outputting an operation signal and applying a voltage between the continuous portion 12 and the brazing material 5d.

  Thereafter, as shown in FIGS. 4 and 5, the control panel 9 outputs an operation signal to the manipulator 8 to move the brazing torch 5 and the near-infrared irradiator 7 so that arc heat is generated. The melted brazing material 5 d is attached along the continuous portion 12. Thereby, the annular brazing part 13 along the said continuous part 12 is formed, and the oil supply pipe main body 2 and the breather tube 4 are mutually connected.

  As described above, according to the embodiment of the present invention, when an arc is generated between the brazing start region R and the brazing material 5 d in the continuous portion 12 of the fuel supply pipe main body 2 and the breather tube 4, the near infrared irradiator 7 is used. Since the temperature of the brazing start region R of the continuous portion 12 is in a high state in advance, the brazing material 5d melted by arc heat is likely to adhere (penetrate) to the continuous portion 12. Therefore, even when the arc is unstable and the arc heat is low, as in the start of brazing, the temperature of the brazing start region R in the continuous portion 12 is not sufficiently high by the arc heat alone, A gap S is not generated between the brazing start region R of the continuous portion 12 and the brazing portion 13, and high airtightness can be secured for the brazed portion 13.

  Further, only the outer peripheral surface side of the fuel supply pipe main body 2 and the breather tube 4 is heated by the near infrared ray H (Z portion in FIG. 3), the brazing start region R of the continuous portion 12 heated in advance is The deformation due to excessive heat input is avoided, and the oil supply pipe body 2 and the breather tube 4 can be connected with high accuracy.

  In the embodiment of the present invention, although the feed pipe main body 2 and the breather tube 4 are mutually connected by the Mig brazing apparatus 10, even in the case where two metal cylindrical members other than the feed pipe main body 2 and the breather tube 4 are connected. The MIG brazing apparatus 10 and the MIG brazing method of the present invention can be applied.

  Further, in the embodiment of the present invention, one end side of the breather tube 4 is inserted into the through hole 2a formed on the one end side of the fueling pipe main body 2 so that the outer peripheral surface of the breather tube 4 on the one end side of the fueling pipe main body 2 Although Mig brazing is performed in a state of being continuous with the outer peripheral surface, the present invention is not limited thereto. For example, the outer peripheral surface at one end side of the breather tube 4 can be obtained by bringing one end peripheral edge of the breather tube 4 into contact with the peripheral edge of the through hole 2a. Mig brazing may be performed in a state in which is continuously provided on the outer peripheral surface of the oil supply pipe body 2.

  Furthermore, in the embodiment of the present invention, when brazing is performed along the continuous portion 12 using the brazing torch 5, not only the brazing torch 5 but also the near-infrared irradiator 7 are simultaneously moved, It is not essential to move the near-infrared irradiator 7 at the same time as the brazing torch 5. For example, the near-infrared irradiator 7 may be fixed near the brazing start region R.

  The present invention relates to a mig brazing apparatus and mig brazing apparatus in which the continuous portion is connected by mig brazing in a state in which the entire outer peripheral surface on one end side of one of two metal cylindrical members is continued to the outer peripheral surface of the other. Suitable for attaching method.

1 Fuel refueling pipe 2 Refueling pipe main body (second cylindrical member)
4 Breather tube (1st cylinder member)
5 Brazing torch 5d Brazing material 7 Near infrared irradiator (heating means)
10 MIG brazing apparatus 12 Continuous part 13 Brazing section R Brazing start area

Claims (4)

It has a brazing torch capable of delivering a wire-like brazing material, and the first and second outer peripheral surfaces of one end side of the metal first cylindrical member are continuous with the outer peripheral surface of the second metal cylindrical member. The brazing material is fed from the brazing torch to the continuous portion of the second cylindrical member, and an arc is generated between the continuous portion and the brazing material to melt the brazing material. A MIG brazing device that forms an annular brazing portion along the continuous portion by adhering along the portion, and connects the first and second cylindrical members to each other,
On the side of the brazing torch, there is provided a heating means for preheating the brazing start area in the continuous part ,
After heating of the brazing start area is completed, the brazing material is delivered from the brazing torch to the continuous portion in a state where heating of the brazing start area by the heating means is stopped. Forming an annular brazed portion along the continuous portion by generating an arc between the continuous portion and the brazing material and adhering it along the continuous portion while melting the brazing material A mig brazing apparatus characterized in that the first and second cylindrical members are connected to each other . In the Mig brazing apparatus according to claim 1,
The MIG heating apparatus is characterized in that the heating means is a near infrared irradiator for emitting near infrared light. With the entire outer peripheral surface of one end side of the metal first cylindrical member being continuous with the outer peripheral surface of the metal second cylindrical member, a wire shape from the brazing torch with respect to the continuous portion of the first and second cylindrical members The molten brazing material is deposited along the continuous portion by delivering the brazing material and generating an arc between the continuous portion and the brazing material to form an annular brazing material along the continuous portion. A MIG brazing method for connecting the first and second cylindrical members to each other by forming a soldering portion,
Including a MIG brazing step of forming the brazed portion after pre-warming the brazing start region in the continuous portion with a heating means ;
In the MIG brazing step, after the heating of the brazing start area is completed, the brazing torch is applied to the continuous portion without heating the brazing start area by the heating means. Annular braze along the continuous portion by delivering the brazing material and adhering along the continuous portion while generating an arc between the continuous portion and the brazing material to melt the brazing material. A MIG brazing method, which is a step of forming a brazing portion and connecting the first and second cylindrical members to each other . In the Mig brazing method according to claim 3 ,
Immediately before the start of brazing, an MIG brazing method is characterized in that the brazing start region in the continuous part is heated by irradiating near infrared rays.

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