JPS5832856Y2 - fuel tank welding equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a welding device for a fuel tank of a motorcycle.

More specifically, the left and right fuel tanks, which have curved surfaces in cross section, are joined together and welded.
The receiver that holds the joint of the tank consists of a jig, a movable presser jig that presses down from above, and a movable support member that presses the left and right sides of the tank, ensuring that the fuel has excellent precision and quality without welding defects. This invention relates to a welding device that makes it possible to obtain a tank.

Since the fuel tank of a motorcycle is installed over the frame and the tank is also an important part of the overall design, its outer plate is curved in a roughly U-shape in cross section, and the tank body is split between the left and right sides. It is molded from thin plate parts divided into two parts, and the curved joining edge of both parts, which corresponds to the back of the product, is welded using an automatic welding machine.

The present applicant has disclosed a method of dividing the tank body into left and right parts and joining them by welding in Japanese Patent Application No. 50-66245 (Japanese Patent Application Laid-open No. 51-143).
No. 234).

The welding device disclosed in this document is large and difficult to work with, and it is difficult to align the joint edges of the divided parts, that is, the workpieces, and there is a risk that problems such as melt drop and distortion are likely to occur during welding. .

In particular, the fuel tank of a motorcycle has a curved surface, so we press it down to ensure the precision of the joint, and prevent the joint from protruding to the back side due to the reaction of the press, eliminating springback while welding. It is very difficult to do this, and it is also difficult to simplify the device.

The present inventors devised the present invention in order to effectively solve the problems of conventional welding devices of this type.

The purpose of this invention is to provide a device for joining and welding the left and right halves of the fuel tank body, which has a curved surface in cross section. It consists of a holding jig that is moved downward by a cylinder unit that holds down the left and right sides of the joint of the workpiece, and a driven supporting member that holds down the left and right sides of the workpiece.It holds the workpiece in the final cross section with fewer welding defects, and welds with high accuracy. To provide welding equipment that can obtain a fuel tank immersed in quality.

Next, a preferred embodiment 11 of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a longitudinal IThE view of the main parts of the welding device, and FIG. 2 shows a side view with the main parts cut away.

A jig 2 is fixedly mounted on the frame 1 to support the workpiece W, and the jig 2 has a backing material formed of a material with good heat diffusion such as copper at the central part of the jig 2 that faces the joint surface of the workpiece. 3 are buried.

The left and right supports, which are the top surfaces of the jig 2, have surfaces 2a, 2a curved outward and upward from the center line of the backing material 3 so as to follow the curved surface shape of the left and right half-height W1 yW2 of the workpiece W. It is formed.

The workpiece W is the main body of a fuel tank for a motorcycle, which is made of a press-formed thin steel plate member, and consists of left and right halves W1. W2 is separately molded into a symmetrical shape.

They are welded together at the joining edge W3, which is the center of the back of the tank body.

Cooling passages 4, 4 through which a cooling medium such as cooling water or cooling gas passes are provided in the backing material 3.

On the other hand, the support member 5... is disposed on both the left and right sides of the jig 2, and the support member 5 projects laterally and has an arm 6 that projects diagonally outward and upward, and a side surface shape of the work W1tW2. As shown in the figure, a total of six supporting parts 7, three on each side, are provided.

Furthermore, a holding jig 8 is disposed above the jig 2, the width of the jig 8 is slightly narrower than that of the jig 2, and a welding torch 1 is placed in the center.
A scanning gap S of 0 is provided in the front-rear direction, and the jig 8 is
The lower surfaces of the left and right blocks 9, 9 are the receivers of the jig 2, and the receiver is the surface 2a.
, 2a, the pressing surfaces 9a, 9a on the outer side are curved.

The jig 8 is supported by a presser plate 14 via a cylinder unit N1° plate 12 and an a-rad 13 provided on the frame 1, and vertical movement of the rod 13 is ensured by a guide block 15 fixedly provided on the frame 1.

In the blocks 9, 9 constituting the presser jig 8, the receivers are provided with cooling passages 16 and 16 similar to the backing material 3 of the jig 2.
are arranged respectively.

As is clear from FIG. 2, a portion of the outer surface of the backing material 3 is provided with four parts 17 for the tank cap.

Click the button above and select Work W1. The receiver W2 is set on the jig 2 so that each joining edge rests on the center part of the backing material 3, and both outer surfaces of the works W1 and W2 are in contact with the supporting parts 7, 7.

In this state, the cylinder unit 11 is driven, whereby the presser jig 8 is lowered via the plate 12, rod 13, and presser plate 14, and the receivers of the jig 2 are placed on surfaces 2a and 2.
a is curved outward from the center line of the backing material 3, the holding surfaces 9a and 9a of the holding jig 8 are the same, and the work W1. The side surface of W2 is supported and guided by support parts γ and γ, and is curved in the direction perpendicular to the center line, so the support, which is the base, is centered on workpieces W1 and yW2 when pressing jig 2 with presser jig 8. A force is applied to the area.

Therefore, the joint edges of the workpieces W1 and W2 are automatically butted against each other and firmly adhered to each other, resulting in a form and precision suitable for welding.

Note that the above work W1. When setting W2, a ferrule is fitted and set in the recess 17 in advance, and with this ferrule set, the vertical positioning of the workpieces is determined by the engagement of the ferrule with the corresponding semicircular recesses of the works W1 and W2. It can be done easily.

As a result, both sides of the joint part of the receiver are pressed by the jig 2 and the holding jig 8, and the weld part rises toward the welding side, that is, toward the torch 10 and toward the back side of the fuel tank, as in normal butt welding. Such a situation does not occur, and the welded portion is restrained to prevent this from occurring.

After holding the workpiece W and W2 as described above, the torch 10 is controlled by a copying cam (not shown) to scan the joint,
Perform welding.

As for the receiver, jig 2 uses a backing material 3 that is affected by heat diffusion, and jig 2゜8 is equipped with a cooling passage for cooling, so welding defects such as weld penetration can be avoided. Does not occur.

Furthermore, work W0. Since the joint part W3 of W2 is in close contact with the jig 2, when forming a back bead at the weld part, the backing material 3
It is also considered to provide grooves in the grooves.

In the example shown above, the workpiece is a fuel tank, but it goes without saying that it can also be used when left and right members having curved surfaces are brought together and welded together.

As is clear from the above, according to the present invention, each of the separately molded workpieces that make up the fuel tank body can be firmly butted together while maintaining the accuracy of the joined parts, and can be reliably pressed and welded. This method is preferable for automatic welding, and since welding is carried out while holding down the welded part and the side of the tank, the final cross-sectional shape of the spring bag etc. can be obtained at the end of welding, and a welded fuel tank with excellent accuracy and quality can be obtained.

As mentioned above, the device is composed of a jig, a presser jig, and a plurality of supporting members, and is easy to purchase and easy to set the workpiece.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view of the claw with the main parts cut away, and FIG. 2 is a side view of the same. In the drawing, W1 and W2 are the workpieces, W is the fuel tank body,
2 is a receiving jig, 3 is a backing material, 8 is a holding jig, S is a scanning gap for the torch 10, 11 is a cylinder unit, 5 is a support member, and 4 and 16 are cooling passages.

Claims (1)

[Scope of utility model registration request] A workpiece made of a press-molded thin plate product with a curved surface is divided into left and right parts, and the workpieces are butted together and the joints are welded.The workpieces that make up the fuel tank are welded together by a device that welds the fuel tank body. The backing material of the section was buried in the upper part, and the fixed pipe, which formed the upper surface of the curved surface that was sunk into the external shape of the back of the fuel tank by turning the work upside down, faces the jig and the upper part of the receiving jig. a movable presser jig, which is arranged to form a curved lower surface that follows the inner surface shape of the back of the fuel tank, and also forms a gap in the front and rear direction for scanning the welding torch to the welding joint of the workpiece; a cylinder unit in which the holding jig is configured such that the receiver can be freely lowered to the jig; the receiver is disposed to protrude upward from both left and right sides of the jig, and supports both left and right sides of the workpiece; It consists of a welding torch that can be lowered to the welding joint of the workpiece and scans along the joint to perform welding, and cooling passages arranged in the backing material and the holding jig, and A recess for the tank cap is formed in a part of the upper surface of the material that backs the weld joint of the workpiece, and the tank cap is fitted into the recess and the workpiece is set in the jig. A welding device for a fuel 1-1 tank, characterized in that the workpiece is vertically positioned and welded using the tank mouthpiece.