JPS6059073B2 - Metal annular body welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding device for a metal annular body that butts and welds both ends of a metal strip material.

Conventionally, as shown in Fig. 1, the method for shaping a metal annular body is to wrap the strip plate 1 in a circle so that both ends a and a' abut against each other, and then weld them together using a flat butt welder or the like and then weld them together by pad welding. After forming an annular body, the welding burrs 2 were cut and removed smoothly using bits 3 and 3' disposed above and below, and then the burrs 2' at both ends of the weld were removed. However, when using this conventional method, when rolling the strip plate 1, it is difficult to achieve a perfect circular curvature at the beginning and end of the roll, as shown in Figure 2, and due to the spring build-up at both ends. As the straight part b, ' is formed, it is difficult to keep the mating surfaces constant, and in order to butt weld both ends a and a', the straight part b, b including both ends a and a' is It was necessary to straighten the ' by pressing it flat.

In particular, a wheel rim material 5 having an irregular cross section as shown in FIG.
When shaping into an annular shape, it is necessary to annularly shape the rim flange 5a side to a slightly smaller diameter D1 and the other rim gutter 5b side to a slightly larger diameter D2. In this case, the upper part of the rim 5 on the flange 5a side The gutter 5b side of the rim 5 is subjected to a compressive force and is rolled into an annular shape due to the tensile force.
The end of the rim 5 on the side of the flange 5a is pulled in the circumferential direction and contracts, and the end of the rim 5 on the side of the gutter 5 is conversely stretched due to compressive force in the circumferential direction.After the rim 5 is rounded, both ends thereof a
, a' are parallel and almost joined, the rim material'
5, the end on the flange 5a side had to be cut slightly longer C, and the end on the gutter 5b side had to be cut slightly shorter E. In addition, when a material having such a flange 5a is shaped into an annular shape, the flange 5 of the rim 5
Either a strong tensile force is generated at the upper end of the rim 5 and the width of the flange 5a becomes shorter, or the bending force is released at the straight parts near both ends a and a' of the rim 5, so the width of the flange 5a is reduced. First, as shown in FIG. 5, the flange 5 near the welded part of the rim 5
The width a is longer than the width of the flange 5a on the other circumferences, and as a result, a protrusion F is formed. Further, there was also the complexity of having to remove this protrusion F in a subsequent process. Furthermore, when a material such as the rim material 5 is rolled into a circular shape with a roll, scratches G and cracks H as shown in FIG. 6 may occur when the material is bitten by the roll. The deformation of the welded part could not be corrected even with subsequent brace straightening, and it was difficult to obtain a good welded part. As shown in FIG. 8, a conventional welding device for welding the metal annular body has a main body base 1
A fixed base 12 is fixed to one side of the base 10 via an insulating plate 11, and a movable base 13 provided on the side of the fixed base 12 to face it is fixed to the other side of the base 10. is slidably mounted by a cylinder 14 provided in the
Each of the fixed table 12 and the movable table 13 is provided with clamp arms 15, 15'', chucks 16, 16'' for tightening the workpiece by the clamp arms, and electrodes 17, 17.
'', and the member to be welded 1 is provided with a chuck 1.
After being clamped between 6,16'' and electrode 17,1,
It was flash pad welded by applying electricity.

However, according to this conventional device, the workpiece 1 to be welded is gripped so as to surround the clamp arm, so it has to be made larger in diameter than the clamp arm, and is subject to dimensional limitations. Also, during flash pad welding, a shunt current flows through the loop part of the annular welded workpiece, so in the case of materials with good conductivity, such as aluminum alloy, the shunt current will be larger. , resistance heat.
The current flow efficiency was extremely poor, and sufficient resistance heat generation could not be obtained, making it impossible to perform good welding. This invention was made in view of the above-mentioned points, and the workpiece to be welded is formed into an oblate ellipse shape, and both ends of the welded member are formed into a flat oval shape. An electrode arm is swingably mounted on the main body base for butt welding, a pedestal is provided below the electrode arm facing the electrode arm, and a pedestal is provided on the electrode arm so as not to come into contact with the workpiece to be welded. The apparatus according to the first invention, wherein a recess is formed in the pedestal that abuts, and further, an electrode arm is swingably mounted on the main body base, and the pedestal is arranged below the electrode arm and facing the electrode arm. and forming a recess in the pedestal that abuts the electrode arm so as not to contact the member to be welded;
To provide a welding device for a metal annular body, which is the device of the second invention, for welding a metal annular body in a good and stable manner by blocking a shunt current by forming a core of a magnetic iron core in the recessed portion during clamping. This will be explained in more detail below with reference to the drawings.

FIG. 7 is an explanatory diagram of a method for shaping a metal annular body applied to the apparatus of the present invention, in which the metal strip material 1 is first bent into a flat oval shape, and both end cuts A,.a'' are formed on the long sides. After shaping the straight parts so that they butt at the center, as shown in Figure 7, both ends are butt welded to form an annular body.Then, the welding burrs are removed in the same way as before, and shrink and expand are performed to form a cylinder. formatted into.

When this method is used for a workpiece having an irregular cross section, such as the aforementioned wheel rim material, the flange portion 5a and the gutter portion 5b can be shaped without any step,
In particular, since the ends A and a'' have straight parts, the ends are not affected by the expansion and contraction of the material due to tension or compression, so there is no need to create a step in the cut of the workpiece material. .

Also, as a result, as mentioned above, a protrusion F is formed near the abutting portion.
Since this does not occur, the subsequent step of removing the protrusions can also be omitted. Next, an embodiment of the metal annular body welding apparatus of the present invention will be described. The apparatus of the first invention is shown in FIGS. 9 and 10.
As shown in the figure, a fixed base 34 is fixed on a main body base 30 via an insulating plate 33, and a movable base 31 is provided opposite to the fixed base 34 so as to be slidable by an upset cylinder 32. Stands 35 and 35 erected respectively
Clamp arm 21 can be swung with pins 26 and 26 in
, 2", and a clamp chuck 22, 2" is provided at the tip thereof.
2", and the other end is the clamp cylinder 27, 27
Concatenate with ``.

Further, below the clamp arms 21, 2'', a pin 28,
2'' and cylinders 29, 29'' to swingably provide electrode arms 23, 23'', and the electrode arms 23
, 23'' are provided with pedestals 24, 2C. The workpiece 1 to be welded is placed between the pedestals 24, 2C and the electrode arms 23, 23''. , 23'' (recessed portions 25, 25'' in FIG. 10) are provided. The electrode arms 23, 23'' are connected to the secondary end of the transformer through flexible conductors (not shown).
, 23'' and the pedestals 24, 24'' in the second invention,
As shown in FIG. 11, the iron cores 36, 36'' are fixed to one or both of the lower surfaces of the electrode arms 23, 23'', and the iron cores are also fixed to the upper surfaces of the pedestals 24, 24'' along the recesses 25, 25''. 37, 37'', and further, an insulator 38,
3'' and 39, 39'' are fixed so that they do not come into contact with the member to be welded 1.

In the device configured in this way, the metal annular body 1 is first inserted into the electrode arms 23, 23'', and the cylinders 29, 29
By energizing the cylinders 27 and 27, the cylinders 27 and 27 come into contact with the pedestals 24 and 2C. Next, the cylinders 27 and 27 are energized to firmly clamp the workpiece 1, and then energization is applied to flash heat it. Finally, the upset cylinder is operated to perform pressure welding. According to this invention, the annular workpiece to be welded can be welded to any type by simply changing the length of the flat part regardless of its circumference. Items can also be welded. In addition, by providing an iron core in the lower surface of the electrode arm that surrounds the welded member and in the recessed part of the pedestal, the circumference of the annular welded member,
Regardless of the material, shunt current can be prevented, power consumption can be reduced, and good and stable welding can be performed.

[Brief explanation of the drawing]

Figures 1A to 6E are explanatory diagrams showing a method of shaping a metal annular body applied to a conventional device; Figures 2 to 6 are explanatory diagrams of a method of shaping a metal annular body applied to a conventional device; Figures 7A to 7E are explanatory diagrams showing a method for shaping a metal annular body applied to the device of the present invention, and Figure 8 is a front view of the conventional device.
FIG. 9 is a front view of the apparatus of the present invention, FIG. 10 is a side view of the main part of the first invention, and FIG. 11 is a side view of the main part of the second invention. 1...Work material, 21, 2"...Clamp arm, 22,22"...Clamp chuck, 2
3,23″...electrode arm, 24,2C...
Receiver/stand, 25, 25″... recess, 36, 36″, 3
7,37″・・・Iron core, 30・・・・・・
Body base.

Claims (1)

[Scope of Claims] 1. A clamp arm with a clamp chuck attached to the tip thereof is swingably mounted on the main body base, and an electrode arm of a certain height is swingably mounted below the clamp arm, and this is mounted below the electrode arm. A metal annular body, characterized in that a pedestal is provided opposite to the pedestal, and a recess is formed in the pedestal that comes into contact with the electrode arm so that the pedestal does not come into contact with a flat elliptical workpiece having an integral width. welding equipment. 2 A swingable clamp arm with a clamp chuck attached to its tip is mounted on the main body base, and an electrode arm of a certain height is swingably mounted below the clamp arm, and a pedestal is mounted below the electrode arm opposite to it. At the same time, a recess is formed in the pedestal that abuts the electrode arm so that the pedestal does not come into contact with a flat elliptical workpiece having a constant width, and an iron core is formed along the recess on the lower surface of the electrode arm and the upper surface of the pedestal. A welding device for metal annular bodies, characterized in that each core is provided.