JPH055321U - UOE Clad Steel Pipe Bead Cutting Equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] Accurately machine the groove of the laminated material part of the UOE clad steel pipe. [Structure] A holder is attached to the rotary shaft on which the end mill is attached, the blade surface faces the outer peripheral surface near the tip of the holder in a direction parallel to the axis of the holder, and the lower end of the blade surface is below the lower end of the holder. A bead cutting device for UOE clad steel pipe with round chips fixed in this way.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a bead cutting device for a UOE clad steel pipe.

[0002]

[Prior Art]

The UOE clad steel pipe is manufactured by using a high-Ni alloy or a Cu-Ni alloy as a composite material, and forming a plate material in which this composite material is adhered to a thick steel plate as a base material by molding and welding the steel pipe to the steel pipe by the UOE process. UOE clad steel pipe, because corrosion resistance can be manufactured at low cost than stainless steel tube on _{high, H 2 S, CO 2,} Cl - oil and gas transportation pipe for a line pipe contains a large amount of corrosive substances such or seawater desalination, Widely used for water intake pipes of equipment.

In the above-mentioned welding of the butt portion of the UOE clad steel pipe, as shown in FIG. 2, first, the base metal portion is subjected to submerged arc welding, and then the welding bead 21 is rotated by the motor 22 and the end mill 23 is rotated by the end mill 23. While moving 23 in the longitudinal direction of the steel pipe, cutting is performed to a depth at which the boundary between the laminated material 24 and the base material 25 can be seen, and TIG welding is performed on the remaining welding beads.

As described above, the two-stage welding is performed by welding the composite material 24 by submerged arc welding having a slow welding speed, and since the heat input to the composite material 24 is large, the carbon of the base material 25 diffuses. This is because it penetrates into the composite material 24 and reduces the corrosion resistance of the composite material 24. Therefore, when the composite material 24 is welded by TIG welding with a high welding speed, the heat input to the composite material 24 is small and the diffusion of carbon also occurs. At least, the corrosion resistance of the laminated material 24 does not decrease.

As a method of removing the above-mentioned excess of the welded joint portion, an arc method disclosed in Japanese Utility Model Laid-Open No. 54-74731 and “Welding Technology” 1989, Vol. 37 No. The method by grinding described in p. 12, p. 71-76 (published by Sangyo Shuppan Co., Ltd.) is often used.

By the way, when the joining material 24 is TIG-welded, it is desirable from the viewpoint of quality assurance that the groove has a shape of the groove portion 31 and has a rising angle θ as shown in FIG. Therefore, the shape of the groove portion 31 of the laminated material is such that both edges are obliquely cut along the longitudinal direction of the plate material at the stage of the plate material so that a predetermined groove is formed when formed into a steel pipe. I try to secure it.

[0007]

[Problems to be solved by the device]

 However, in the conventional groove forming method, when forming into a steel pipe, the groove portion does not always form a symmetrical groove shape, and the forming conditions of both edges of the steel sheet and the abutting portion during forming There is a problem that a predetermined groove shape may not be obtained due to the deviation.

Further, when a defect occurs in the welded portion during the submerged arc welding, the welded portion is repaired and the repaired portion is ground by a grinder to finish, so that there is a problem that the groove shape is partially damaged.

This invention solves the above-mentioned problems of the prior art, and utilizes the drive mechanism of the end mill that has been used conventionally, which can cut the welding bead of submerged arc welding and simultaneously process the butt material. The object is to provide a bead cutting device for UOE clad steel pipe.

[0010]

[Means for Solving the Problems]

 The bead cutting device for UOE clad steel pipes according to the present invention has a holder mounted on a rotary shaft for mounting an end mill, and the blade surface faces the outer peripheral surface near the tip of the holder in a direction parallel to the axis of the holder. In addition, the round piece chips are fixed so that the lower end of the blade surface is below the lower end of the holder.

[0011]

[Action]

 The bead cutting device for UOE clad steel pipes according to the present invention has a holder mounted on a rotary shaft for mounting an end mill, and the blade surface faces the outer peripheral surface near the tip of the holder in a direction parallel to the axis of the holder. Moreover, since the round piece tip is fixed so that the lower end of the blade surface is below the lower end of the holder, the center of the rotating shaft of this cutting device is aligned with the center of the bead of the UO E clad steel pipe, and the cutting device is While moving in the longitudinal direction of the steel pipe, when the bead made by submerged arc welding is cut into the blade surface of the round piece tip, the round piece tip turns while using the axis of the end mill mounting rotary shaft as the center of rotation. In addition to cutting the bead, part of the base material and the groove of the laminated material are also cut. Since the cutting edge of the round piece has an arc shape, the shape of the groove portion is a groove suitable for TIG welding performed later.

[0012]

【Example】

 A bead cutting device for a UOE clad steel pipe according to an embodiment of the present invention will be described with reference to FIG. A bead cutting device for a UOE clad steel pipe according to an embodiment of the present invention includes an electric motor 1, a holder 2 mounted on a rotating shaft of the electric motor 1, and a blade surface 3 of the holder 2 on the outer peripheral surface near the tip of the holder 2. It is composed of a round piece 5 which is fixed by a bolt 4 so that the blade surface 3 is lower than the lower end 2a of the holder 2 and is parallel to the axis.

When cutting the bead after submerged arc welding of the UOE clad steel pipe with the bead cutting device for the UOE clad steel pipe described above, the center of the rotary shaft of the cutting device is approximately the center of the bead 21 of the UOE clad steel pipe. According to the above, while moving the cutting device in the longitudinal direction of the steel pipe and cutting the blade surface 3 of the round piece chip 5 into the bead 21 made by submerged arc welding, the round piece tip 5 is attached to the end mill. While turning around the axis of the holder 2 as the center of turning, the bead 21 is cut, and at the same time, part of the base material 25 and the groove portion 31 of the laminated material 24 are cut. Since the shape of the cutting edge of the round piece 5 is arcuate, the shape of the groove 31 is a groove suitable for TIG welding performed later.

Further, since the drive mechanism of the bead cutting device for this UOE clad steel pipe uses the drive mechanism of the end mill that has been used conventionally, the equipment cost is low.

[0015]

[Effect of the device]

 According to this invention, an ideal groove shape can be processed when TIG welding the laminated material portion of the UOE clad steel pipe.

[Brief description of drawings]

FIG. 1 is an explanatory view of a bead cutting device for a UOE clad steel pipe according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a conventional bead cutting device for a UOE clad steel pipe.

FIG. 3 is an explanatory diagram of a groove shape of a welded portion.

[Explanation of symbols]

 1 Electric motor 2 Holder 3 Blade surface 4 Bolt 5 Round piece chip

Claims (1)

[Claims for utility model registration] [Claim 1] A holder is mounted on a rotary shaft for mounting an end mill, and a blade surface faces the outer peripheral surface near the tip of the holder in a direction parallel to the axis of the holder A bead cutting device for UOE clad steel pipe, characterized in that a round piece tip is fixed so that a lower end portion of the surface is lower than a lower end portion of a holder.