JP3536192B2 - Flash cover for flash butt welding machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flash cover for a flash butt welder for preventing the flash from scattering during flash butt welding.

[0002]

2. Description of the Related Art FIG. 4 is a schematic view of a conventional running flash butt welding apparatus 4. The welding device 4 is a traveling body 4
0 is provided with a fixed head 41 and a moving head 42, and hydraulic cylinders 43a and 44 for clamping the leading billet 1a and the trailing billet 1b, respectively, to each head.
It is equipped with a plurality of a, 43b and 44b. Of these, the hydraulic cylinder 43 closer to the end face of the billet
a and the clamp body of the hydraulic cylinder 43b are electrodes 45, 46.
Has become. In addition, the fixed head 41 and the moving head 42
Are connected by a plurality of upset hydraulic cylinders 47.

In the running flash butt welding apparatus 4 of FIG. 4, when a welding current is applied to the leading billet 1a and the trailing billet 1b through the electrodes 45 and 46 to perform flash butt welding, the end face of the abutting portion 2 thereof. The weld metal flashes and scatters. In order to protect the surroundings from the scattering of this flash, the machine has conventionally been surrounded by a makeshift stand.

[0004]

The flash scattered in flash butt welding is inevitable, but the energy and amount of the flash increase as the cross-sectional area of the workpiece increases. In the case of the conventional cover of the vertical type, the flash adheres everywhere on the machine and causes bad influence such as insulation failure. Therefore, regular cleaning is essential. In addition, a simple cover could not be said to be sufficient from the viewpoint of safety to humans and prevention of fire due to the scattered flash. Furthermore, if the welding machine becomes large, there is a limit to the enclosure. In particular, in a large-scale flash butt welding device for running, the flash generation energy during welding is extremely large, and the amount of flash residue is 1 liter or more / 1 joint, which is continuously covered so as not to accumulate residue. It was extremely difficult.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a flash cover for a flash butt welding machine in which flash scattering is appropriately suppressed.

[0006]

A flash cover for a flash butt welding machine according to the present invention has a lower side open, a top plate inclined and attached, and a side formed along the longitudinal direction of a billet to be welded. The box-shaped upper cover is narrowed down as the section is inclined and the cross-section becomes smaller as it goes downward, and the lower end side of the upper cover is provided so as to cover the upper and lower sides, and the side section is opened. A box-shaped lower cover having an inclined portion, and cooling water supply means for supplying cooling water to the outer wall of the top plate of the upper cover and forming a water film on the side inner wall of the upper cover. Then cooling
The water supply means is a water storage arranged outside the upper part of the upper cover.
Equipped with a tank so that water from the water tank overflows
In this form, the water film flows into the side inner wall of the upper cover to form a water film.
To form . Further, the cooling water supply means forms a water film having a thickness of 5 mm to 10 mm on the inner wall of the side portion of the upper cover. Further, a groove portion for allowing the billet to penetrate is provided at the lower end portion of the upper cover and the upper end portion of the lower cover, respectively.

In the present invention, when flash is generated by flash butt welding, it is scattered. For example, some of the splashes upward hit the top plate of the upper cover, but since the top plate is placed diagonally and is cooled, the flash does not adhere and falls to the lower cover side. . Also, as for flashes scattered in other directions, although they may hit the side part of the upper cover or the lower cover, they are cooled by the water film, and since the side parts are cooled and arranged obliquely, It will be discharged together with the water forming the water film without adhering to the inner wall of the part.

[0008]

1 is a front sectional view of a flash cover for a flash butt welding machine according to an embodiment of the present invention, and FIG. 2 is a side view thereof. The flash cover 10 is composed of an upper cover 12 and a lower cover 14. The upper cover 12 has a box-like shape with an open lower side, and the top plate 16 is arranged to be inclined,
The outer wall portion is configured to allow cooling water to flow.
The upper cover 12 has a cross section that becomes smaller as it goes downward and is narrowed down so that the side portions 18 are inclined inward, and the lower end portion of the side portions 18 has a groove portion 20 as illustrated.
Is provided, and the billet 1 is arranged so as to pass through the groove 20. It should be noted that since the energy of the light scattered in the upper part of the flash is large, the top plate 16
Is preferably arranged at a position sufficiently separated from the welded part of the billet 1, and the energy of the flash debris is absorbed by air resistance by keeping a distance from the welded part.

Further, the lower cover 14 is arranged so that the upper end thereof covers the lower end of the upper cover 12, and the side portion 22 of the lower cover 14 is also inclined inward, and the upper end has a groove portion. 24 are provided. Water tanks 26 and 28 are arranged outside the upper part of the upper cover 12, and the water tank 2
Water is constantly supplied from 6, 28 and flows into the inner wall of the side portion 18 of the upper cover 12 in a form of overflow to form a water film 30 and cools the inner wall of the side portion 18. Further, the cooling water supplied to the outer wall portion of the top plate 16 also flows into the water storage tank 26. 1 and 2 show a state at the time of welding. The upper cover 12 and the lower cover 14 are of an elevating type, and when the billet 1 is conveyed, the upper cover 12 rises, Lower cover 1
4 is lowered so that the welds of the billet 1 do not come into contact with the covers 12 and 14 and the covers are not damaged.

FIG. 3 is a view of the upper cover 12 of FIG. A water cooling pipe 35 is laid on the outer wall of the side portion 19 of the upper cover 12 which is orthogonal to the longitudinal direction of the billet, and the side portion 19 is cooled from the outside to keep it at a low temperature to prevent flash residue welding.

In the flash cover 10 of FIGS. 1 to 3, the water from the water tanks 26 and 28 forms a water film 30 on the inner walls of the side portions 18 of the upper cover 12 and the side portions 22 of the lower cover 14. Further, cooling water is supplied to the outer wall of the top plate 16 of the upper cover 12 for cooling. Furthermore, the top cover 1
The second side portion 19 is cooled by the cooling water of the water cooling pipe 35. In this state, flash butt welding is performed, and the flash is scattered. For example, the flash has a large energy, but since the distance from the weld to the top plate 16 is sufficient, the flash energy is Most particles do not reach the top plate 16 because they are absorbed by the air resistance. Some flashes reach the top 16 and hit, but even if they hit, their energy is already small, and
Since the top plate 16 is inclined, its collision force weakens,
Furthermore, since the outer wall of the top plate 16 is cooled, it is prevented from adhering to the inner wall of the top plate 16 and falls to the side portion 18 side of the upper cover 12 or the lower cover 14 side.

Of the flashes scattered in other directions, the flash energy that hits a plane parallel to the core of the billet 1 has a large collision energy. However, in the present embodiment, the flash is cooled by the water film 30 formed on the inner wall of the side portion 18, and what penetrates the water film 30 collides with the inner wall of the side portion 18, but at this time, Since the inner wall of the side wall is slanted, the collision force against the inner wall of the side part 18 is diverted, and since the inner wall of the side part 18 is cooled, the water does not adhere to the inner wall of the side part 18 and The water of the membrane 30 drops and is discharged. This also applies to the lower cover 14. The water film 30 has a thickness of at least about 5 mm to 10 mm. In addition, regarding the flash on the inner wall of the side portion 19, since the side portion 19 is cooled,
It does not adhere to the inner wall of the unit and is dropped and discharged.

FIG. 4 is an end view taken along the line AA of FIG. As is clear from the figure, when forming the side portions 18 and 19 of the upper cover 12, the seam welded portion 19a is positioned as shown so that the angle at which the flash hits becomes small, and Smooth the area to avoid flash sticking.

[0014]

As described above, according to the present invention, the top plate of the upper cover is diagonally arranged, and the side portions of the upper cover and the lower cover are diagonally arranged so that the top plate of the upper cover is attached to the outer wall of the top plate. In addition to supplying cooling water for cooling, a water film is formed on the inner wall of the side of the upper cover to cool it, so even if the flash hits the top plate of the upper cover or the side of the upper or lower cover. The water does not adhere to them and falls and is discharged together with the water that has formed the water film, and the scattering of the flash is appropriately suppressed.

[Brief description of drawings]

FIG. 1 is a front sectional view of a flash cover for a flash butt welding machine according to an embodiment of the present invention.

FIG. 2 is a side view of the flash cover of FIG.

FIG. 3 is a view of the upper cover of FIG.

FIG. 4 is an end view taken along the line AA of FIG.

FIG. 5 is a schematic diagram of a conventional running flash butt welding apparatus.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 56-26679 (JP, A) JP 9-94675 (JP, A) JP 57-50284 (JP, A) JP 10- 296449 (JP, A) JP-A-5-31419 (JP, A) Jikho 57-7492 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23K 11/04 B23K 11 / 36

Claims (3)

(57) [Claims] 1. A lower part is opened, a top plate is attached with an inclination, a side part formed along a longitudinal direction of a billet to be welded is inclined, and a cross section becomes smaller as it goes downward and is narrowed. A box-shaped upper cover, a box-shaped lower cover that is provided so as to cover the lower end side of the upper cover, is open at the upper and lower sides, and has inclined portions on the sides, and the upper cover. supplies the cooling water to the outer wall of the top plate of, have a cooling water supply means for forming a water film on the side inner wall of the upper cover, is placed the cooling water supply means to the upper outer of the upper cap
Equipped with a stored water tank, the water from the water tank overflows
Flow into the side inner wall of the top cover in a
A flash cover for a flash butt welding machine, which is characterized by forming a water film with . 2. The flash cover for a flash butt welding machine according to claim 1, wherein the cooling water supply means forms a water film having a thickness of 5 mm to 10 mm on a side inner wall of the upper cover. 3. A lower end portion and in the claims 1 or 2 flash cover for a flash butt welding machine according to, characterized in that a groove for passing the billet to the upper end of the lower cover provided each of the upper cover.