JP2016068146A - Mig blazing device and method for mig brazing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mig blazing device and a method for mig blazing capable of securing an excellent airtightness in a blazed part when a whole circumference of an end side peripheral surface of one of two metal cylindrical members is connected to an outer peripheral surface of the other metal cylindrical member by mig brazing.SOLUTION: A method for mig blazing comprises: providing a state in which a whole circumference of an end side peripheral surface of a breather tube 4 is arranged to be adjacent to an outer peripheral surface of an oil supply tube body 2; and connect the oil supply tube body 2 and the breather tube 4 by forming an annular brazed portion 13 along a continuous part 12 of the oil supply tube body 2 and the breather tube 4. A near-infrared radiator 7 is installed on a side of a blazing torch 5, to heat a brazing starting region R along the continuous part 12 in advance.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a MIG brazing apparatus and a MIG brazing apparatus in which a continuous portion is connected by MIG brazing in a state in which the entire outer periphery of one end side of two metal cylinder members is continuously connected to the other outer peripheral surface. 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 fuel supply pipe main body, and the breather tube has one end side of the fuel supply pipe main body. It is generally connected to the oil supply pipe main body by forming an annular brazed portion in the continuous part of the outer peripheral surface of the oil supply pipe body and the outer 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 oil supply pipe main body and 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 overlapped with the brazing start portion R to form the annular brazing portion 17, a fine gap is formed between the brazing start portion R and the continuous portion 16 of the brazing portion 17. Even if S remains, and the brazed portion 17 is in a healthy state on the appearance, the gap S cannot maintain airtightness.

  The present invention has been made in view of such a point, and the object of the present invention is to Mig braze one outer peripheral surface of one end of two metal cylindrical members to the other outer peripheral surface. 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 tube member is made continuous with the outer peripheral surface of the metal second tube member Then, the brazing material is fed 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. In the MIG brazing apparatus that forms an annular brazing portion along the continuous portion by adhering along the continuous portion while being melted, and connects the first and second cylindrical members to each other, the following solution is provided. I took it.

  That is, the first invention is characterized in that a heating means for preheating the brazing start area in the continuous portion is provided on the side of the brazing torch.

  According to a second aspect, in the first aspect, the heating means is a near infrared irradiator that irradiates near infrared rays.

  In the present invention, the entire circumference of the one end side outer peripheral surface of the metal first cylindrical member is made continuous with the outer peripheral surface of the metal second cylindrical member, and the wax is continuous with respect to the continuous portion of the first and second cylindrical members. A wire-like brazing material is fed out from the brazing torch, and an arc is generated between the continuous portion and the brazing material, so that the molten brazing material is adhered along the continuous portion and the continuous portion is continuous. The following solution was taken for the MIG brazing method in which the first and second cylindrical members are connected to each other by forming an annular brazing portion along the portion.

  That is, the third invention is characterized in that the brazing portion is formed after the brazing start region in the continuous portion is preheated by the heating means.

  According to a fourth invention, in the third invention, the brazing start region in the continuous portion is heated by irradiating near infrared rays.

  In 1st and 3rd invention, when an arc generate | occur | produces between the brazing start area | region and brazing material in the continuous part of a 1st and 2nd cylindrical member, the temperature of the brazing start area | region of the said continuous part is high beforehand. Since it will be in a state, it will become easy for the brazing material melted by the arc heat to adhere (penetrate) to the continuous portion. Therefore, even in a state where the arc is unstable and the arc heat is low, such as at the start of brazing, and the temperature of the brazing start region in the continuous portion is not sufficiently high only by the arc heat, the continuous portion 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.

1 is a perspective view of a fuel supply pipe assembled by a MIG brazing apparatus according to an embodiment of the present invention, a fuel tank to which the fuel supply pipe is connected, and a fuel supply cap that turns a fuel supply opening. 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 with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.

  FIG. 1 shows a fuel tank 20 of a vehicle and a fuel supply pipe 1 that serves as a passage when fuel is supplied to the fuel tank 20. The fuel supply pipe 1 has an enlarged diameter at one end side and the other. A substantially circular cylindrical metal fuel supply pipe body 2 (second cylinder member) having an end connected to the fuel tank 20 and a substantially circular short cylindrical retainer fitted to the enlarged diameter portion of the fuel supply pipe body 2 3 is provided.

  One end of the retainer 3 constitutes a fuel filler port 3b of the fuel fuel supply pipe 1, while the other end of the retainer 3 has a shape that gradually decreases in diameter toward the end (see FIG. 2). .

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

  On the side of the fuel supply pipe body 2, one end of the fuel supply pipe body 2 is connected to the retainer 3 side, while the other end of the fuel tank 20 is connected to the fuel tank 20. 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.

  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 oil supply pipe body 2 and the breather tube 4, and the above-mentioned A welding power source 6 capable of applying a voltage to the brazing material 5d, a near-infrared irradiator 7 (heating means) which is disposed on the side of the brazing torch 5 and can irradiate the near-infrared ray H; A manipulator 8 capable of gripping the brazing torch 5 and the near infrared irradiator 7 and moving 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 oil supply pipe body 2 and the breather tube 4 are fixed by a fixing jig (not shown), and one end side of the breather tube 4 is fitted into a through hole 2a formed on one end side of the oil supply 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 filler metal 5d is screwed and connected to the center of the tip of the torch body 5a, and the torch nozzle 5b surrounds the contact tip 5c.

  The manipulator 8 is configured so that the tip of the brazing material 5d of the brazing torch 5 and the irradiation position Z of the near-infrared irradiator 7 move along the continuous portion 12 of the oil supply pipe body 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 feeding operation of the brazing torch 5, the voltage value of the welding power source 6, the near infrared irradiation 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 for the brazing start region R, and to the brazing torch 5. An operation signal is output, the brazing material 5d is sent from the brazing torch 5 to the continuous portion 12, and an operation signal is output to the welding power source 6 to output the continuous portion 12 and the brazing material 5d. An arc is generated by applying a voltage between the two.

  Further, as shown in FIG. 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 as to be melted by arc heat. The material 5d is adhered along the continuous portion 12 to form an annular brazed portion 13 along the continuous portion 12 so as to connect the fuel supply pipe 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, the operator inserts one end of the breather tube 4 into the through hole 2a of the oil supply pipe body 2 and fixes the oil supply pipe 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 ray irradiator 7, and based on the signal, the near-infrared ray irradiator 7 enters the brazing start region R in the continuous portion 12 as shown in FIG. The region R is preheated by irradiating near infrared rays 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, thereby generating an arc heat. The molten brazing material 5d is adhered 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 5d in the continuous portion 12 of the fuel supply pipe body 2 and the breather tube 4, the near infrared irradiator 7 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 at the start of brazing, and the temperature of the brazing start region R in the continuous portion 12 is not sufficiently high only by the arc heat, 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.

  Moreover, since only the outer peripheral surface side of the oil 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 to be preheated 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, the MIG brazing device 10 connects the oil supply pipe body 2 and the breather tube 4 to each other. However, the MIG brazing device 10 also connects the two metal cylinder members that are not the oil supply pipe body 2 and the breather tube 4. 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 fitted into a through hole 2 a formed on one end side of the oil supply pipe body 2 so that one end side outer peripheral surface of the breather tube 4 is attached to the oil supply pipe body 2. MIG brazing is performed in a state of being continuous with the outer peripheral surface. However, the present invention is not limited to this. For example, one end outer peripheral surface of the breather tube 4 is brought 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 along the continuous portion 12 using the brazing torch 5, not only the brazing torch 5 but also the near-infrared irradiator 7 is simultaneously moved. It is not essential that the near-infrared irradiator 7 is moved simultaneously with 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 a MIG brazing apparatus in which a continuous portion is connected by MIG brazing in a state in which the entire outer periphery of one end side of two metal cylinder members is continuously connected to the other outer peripheral surface. Suitable for attaching method.

1 Fuel supply pipe 2 Fuel supply pipe body (second cylinder member)
4 Breather tube (first tube member)
5 Brazing torch 5d Brazing material 7 Near infrared irradiator (heating means)
10 MIG brazing device 12 Continuous part 13 Brazing part R Brazing start area

Claims (4)

A brazing torch capable of delivering a wire-like brazing material, the first and second metal cylinder members being connected to the outer peripheral surface of the metal second cylinder member in a state where the entire outer circumference of the one end side is continuous with the first and second metal members; 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,
A MIG brazing apparatus, characterized in that, on the side of the brazing torch, a heating means for preheating the brazing start area in the continuous portion is provided. The MIG brazing device according to claim 1,
The MIG brazing device, wherein the heating means is a near infrared irradiator that irradiates near infrared rays. From the brazing torch to the continuous portion of the first and second cylindrical members in a state where the entire outer peripheral surface of the one end side of the metal first cylindrical member is made continuous with the outer peripheral surface of the metallic second cylindrical member. The brazing material is fed out and an arc is generated between the continuous portion and the brazing material, so that the molten brazing material adheres along the continuous portion and the annular brazing along the continuous portion. A MIG brazing method for connecting the first and second cylindrical members to each other by forming a soldering portion,
The MIG brazing method, wherein the brazing portion is formed after the brazing start region in the continuous portion is preheated by a heating means. 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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