JPH09300082A - Squeeze roll for ERW steel pipe welding machine - Google Patents

Abstract

(57) [Problem] To improve the wear resistance and seizure resistance of a squeeze roll for an electric resistance welded steel pipe welding machine. A squeeze roll includes a roll shaft, a roll body, and a caliber unit. The caliber 15 is made of ceramic. The roll body 14 and the roll shaft 10 are made of alloy tool steel. Circulating cooling water passage holes 6, 7 and 8 are provided inside the roll body 14 and the roll shaft 10. [Effect] Since the caliber portion 15 is made of ceramic, it is hardly affected by induction heating. Cooling water holes 6, 7, 8
Is provided inside the roll body 14 and the roll shaft 10, so that the cooling efficiency is high and the rigidity is high.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeeze roll for use in an electric resistance welded steel pipe welding machine, and more specifically, a welding defect caused by foreign matter in cooling water or an oxide defect caused by steam oxidation is generated in a welded portion of an electric resistance welded steel pipe. The present invention relates to a squeeze roll for an electric resistance welded steel pipe welder, which is excellent in wear resistance and seizure resistance and is not caused.

[0002]

2. Description of the Related Art In high-frequency welding of ERW steel pipes, squeeze rolls are used for applications such as pressure welding of heated steel strip edges. The squeeze roll is generally placed immediately after the high-frequency resistance welding means, and cooling is indispensable because it becomes high temperature due to heat conduction from both edges of the steel strip heated by high-frequency resistance welding and induction heating from the high-frequency power source. is there.

[0003] A conventional method of cooling a squeeze roll in the production of an electric resistance welded steel pipe is a method of directly cooling water from outside the roll. However, this method has a problem that the temperature of the welded portion of the steel pipe is lowered by cooling water, welding defects due to foreign matter in the cooling water, oxide defects due to steam oxidation of the cooling water, and the like are easily generated.

[0004] In order to solve such a problem, various internal cooling systems have been conventionally studied. The squeeze roll
It consists of a roll axis, a roll body provided around the roll axis, and a caliber section provided around the roll body, and a typical typical example of the internal cooling system is inside the caliber section of a squeeze roll. In this method, a squeeze roll is directly cooled from the inside of the caliber section by providing a water passage hole for cooling water. However, this method has problems in the wear resistance and seizure resistance of the caliber part.

In order to solve this problem, a squeeze roll as shown in FIG. 2 has been proposed. As shown in FIG. 2, the conventional squeeze roll has the caliber portion 13 made of cemented carbide steel in order to improve the wear resistance and seizure resistance of the caliber portion 13, and the flange portion 11,
A general material such as a steel material other than the cemented carbide material is used for the roll shaft 12 and the roll shaft 10, and the inside of the cemented carbide material of the caliber portion 13 having a problem in workability and impact resistance is not processed. Water holes 6, 7, 8 for cooling water are directly provided only inside the general material 12 and the roll shaft 10. In FIG. 2, 1 is a water supply port, 2, 3, 4, and 5 are internal cooling boxes for cooling water, and 9 is a drain port. (Hereinafter referred to as “prior art”).

[0006]

However, in the prior art, there is a problem that the caliber portion made of cemented carbide which is subjected to induction heating is insufficiently cooled, and the squeeze roll may cause breakage and the like. .

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, and to prevent the occurrence of welding defects due to foreign matter in cooling water and oxide defects due to steam oxidation in a welded portion of an electric resistance welded steel pipe. Another object of the present invention is to provide a squeeze roll for an electric resistance welded steel pipe welding machine having excellent seizure resistance.

[0008]

Means for Solving the Problems The inventors have made intensive studies to solve the above-mentioned problems. As a result, the following findings were obtained. By using a non-magnetic ceramic for the caliber part of the squeeze roll, the influence of induction heating of the caliber part can be reduced, and a sufficient cooling effect can be obtained even by internal cooling of only the roll body and roll shaft, and excellent wear resistance and Seizure resistance is obtained.

The present invention has been made on the basis of the above findings, and the invention according to claim 1 is a roll shaft,
A roll body provided around the roll shaft, and a squeeze roll for an electric resistance welded steel pipe welder including a caliber portion provided around the roll body, wherein the caliber portion is made of ceramic, and the roll body and the The roll shaft is made of a general material such as steel, and is characterized in that a circulating cooling water passage is provided inside the roll body and the roll shaft other than the caliber portion.

In the squeeze roll of the present invention, the caliber portion is made of ceramic, the material of the roll body and the roll shaft other than the caliber portion is a general material such as steel, and the circulation body is provided inside the roll body and the roll shaft other than the caliber portion. It is an internal water-cooled squeeze roll provided with cooling water passage holes.

Ceramic should be used for the material of the caliber part. By using ceramics for the caliber, the effect of high temperature of the caliber due to induction heating can be prevented, and the cooling efficiency of the caliber can be improved. When the caliber portion is made of a general material such as a cemented steel material or a steel material, cooling is insufficient when subjected to induction heating. In addition, there is a possibility that breakage may occur in the cemented steel part.

For the material of the roll body and the roll shaft, general materials such as steel materials used as materials for conventional squeeze rolls should be used. That is, in the present invention, since the circulation type cooling water passage holes are provided in the roll body and the roll shaft, it is not necessary to provide the cooling water passage holes in the caliber portion made of ceramic having poor impact resistance and poor workability. This is because there is a risk of breakage, and it is not preferable when considering the rigidity of the entire squeeze roll. Therefore, ceramic is used for the caliber portion, and the above-mentioned general materials are used for the roll body and the roll shaft.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention. As shown in FIG. 1, the squeeze roll for an electric resistance welder includes a roll shaft 10, a roll body 14 provided around the roll shaft 10, and a caliber portion 15 provided around the roll body 14. Has become. Roll body 1
The roll shaft 4 and the roll shaft 10 are made of a general material such as alloy tool steel. The caliber 15 is made of ceramic.

Inside the roll body 14, cooling water passage holes 6,
7, 8 are provided in communication. A water supply port 1, a water discharge port 9, and a conduit thereof are provided in the roll shaft 10, a water supply port 1 is provided in the cooling water flow hole 6, and a discharge port 9 is provided in the cooling water flow hole 8.
However, they are in communication. The caliber 15 is not provided with a cooling water passage for internal cooling.

The squeeze roll is cooled while the cooling water enters from the water supply port 1 and is discharged from the drainage port 9 through the cooling water water passage holes 6, 7, and 8. By using ceramic for the caliber section 15, the caliber section 15 by induction heating is used.
Can be prevented, and the cooling efficiency of the caliber 15 is improved. The caliber 15 made of ceramic having low impact resistance and poor workability has cooling water holes 6.
8 to 8, the water supply port 1 and the drainage port 9 are not provided, the caliber portion 15 is not damaged.

[0016]

As described above, according to the present invention, since the wear resistance and the seizure resistance are improved by using the ceramic in the caliber portion, the roll body and the roll shaft, which are made of a general material and have high rigidity, are used. Only the internal cooling water through holes are processed, so high rigidity is obtained, and cooling efficiency that is far superior to the conventional internal water-cooled squeeze rolls is obtained.
Then, by using the squeeze roll of the present invention in an electric resistance welded steel pipe welder, it is possible to prevent the temperature drop of the welded portion due to the cooling water, the welding defect due to the foreign matter in the cooling water, the oxide defect due to the steam oxidation phenomenon of the cooling water, etc. It is possible to provide an industrially useful effect.

[Brief description of drawings]

FIG. 1 is a sectional view showing one embodiment of a squeeze roll of the present invention.

FIG. 2 is a sectional view showing an example of a conventional squeeze roll.

[Explanation of symbols]

 1 Water Supply Port 2, 3, 4, 5 Cooling Water Cooling Box 6, 7, 8 Cooling Water Passage Hole 9 Drain Port 10 Roll Shaft 11 Upper Flange 12 Lower Flange 13 Carbide Caliber Part 14 Roll Body 15 Ceramic Made Caliber club

Front Page Continuation (72) Inventor Yuji Sato Marunouchi 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Japan Steel Tube Co., Ltd. Within the corporation

Claims (1)

[Claims] 1. A squeeze roll for an electric resistance welded steel pipe welder comprising a roll shaft, a roll body provided around the roll shaft, and a caliber portion provided around the roll body. It is made of ceramics, the roll body and the roll shaft are made of a general material such as steel, and the inside of the roll body and the roll shaft other than the caliber portion is provided with a circulating cooling water passage hole. A squeeze roll for electric resistance welded steel pipe welders.