JPH0533206Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to an inner bead cutter for ERW tubes that is equipped with a cutting tool position adjustment function so that the inner bead of the ERW tube can be reliably cut. .

[Prior Art] Fig. 4 is a diagram showing an example of an electric resistance welded pipe manufacturing apparatus. In the figure, a strip S is continuously fed in the direction of the arrow and shaped into a pipe by a group of forming rolls 2. The joint 3 is then welded by electric resistance welding to form a pipe.

Fig. 5 shows an example of an inner bead cutter for cutting and removing the inner bead among the weld beads on the inner and outer surfaces of the tube produced by electric resistance welding, and 5 is a blank tube 1A.
The cutter body 4 is fixed to the tip of the mandrel rod 5, and the rear end thereof is suspended from a bracket (not shown). The cutter main body 4 is provided with a cutting tool 7 projecting from its upper surface, and a vertical tension roller 8 projecting from its lower surface and movable up and down. Upper and lower tension roller 8
By operating in the direction of the arrow, the cutting tool 7 can be pressed against the inner bead (not shown) and the inner bead can be cut. The quality of cutting the inner bead is determined by the guidance of the relative positions of the cutting tool and the inner bead in the vertical and horizontal directions.

By the way, Japanese Patent Laid-Open No. 54-24390 is known as an example of a conventional inner bead cutter. In this example, rollers 9 and 9 are placed at points A and B in the steel pipe shown in Figure 6.
, the horizontal component force D is received by the rollers 9, 9, and the cutting tool 7 is centered by the reaction force D'.

[Problems to be solved by the invention] However, with such a device, it is not possible to always align the positions of the cutting tool 7 and the inner bead.

As a result, cutting residues are generated in the width direction of the inner bead, which requires cleaning of the defective cutting portions at the rear elevations and lower elevations, which is a major cause of increased manufacturing costs. For this reason, conventionally, as shown in Fig. 7, an adjusting liner 11 was inserted into the side wall of the cutting tool holder 10 to adjust the relative position of the cutting tool 7 in the bead width direction. Because it is located inside the pipe during welding, when making this adjustment, it is necessary to temporarily stop the pipe-making line and to cut the pipe around the cutting tool using gas cutting, etc., which reduces yield and work efficiency. This caused a huge decline.

The object of the present invention is to easily align the cutting tool and the inner bead when cutting the inner bead of an electric resistance welded tube.

[Means for Solving the Problems] The present invention advantageously solves the above-mentioned problems. A cutting tool 7 is provided on the cutter main body 4 so as to protrude from the upper surface thereof. A vertical tension roller 8 is provided on the cutter main body 4 and protrudes from the lower surface and is movable up and down. This is an inner bead cutter for electric resistance welded tubes, which is composed of a position adjustment roller 12 that is protruding and movable from side to side.

[Function] In the present invention, position adjustment rollers are provided on the cutter body of the electric resistance welded pipe inner surface bead cutter, protruding from both sides and movable from side to side, so one of the position adjustment rollers can be moved in the left and right direction to cut the inner surface of the electric resistance welded pipe. When pressed, the cutter body moves in the pressing direction and the half body direction due to the reaction force. Therefore, the cutting tool provided on the cutter body can be moved in the width direction of the inner bead to align the cutting tool with the inner bead.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in FIGS. 1 to 3.

Figure 1 shows a plan sectional view, Figure 2 shows a side sectional view,
12A and 12B are position adjustment rollers provided on both left and right sides of the cutter body 4;
A central portion in the length direction of the arm 13 that supports A and 12B is connected to a worm jack 14. The worm jack 14 is driven by a hydraulic motor 15, and when the hydraulic motor 15 is driven, the position adjustment rollers 12A and 12B and the arm 13 are connected to each other. moves in the left and right direction, presses one of the position adjustment rollers 12A and 12B against the inner surface of the ERW tube 1, and the reaction force moves the cutter main body 4 in the width direction of the inner bead, thereby separating the cutting tool 7 and the inner bead. Can be aligned. Reference numeral 16 designates guide rollers for preventing misalignment of the cutting tool 7 and the inner bead due to sideways movement of the cutter body 4 or the electric resistance welded tube 1. Each of the guide rollers 16 is connected to a hydraulic cylinder 17. By the extension of 17, both guide rollers 16, 16 can be brought into contact with the inner surface of the electric resistance welded tube.

Reference numeral 8 shown in FIG. 2 is a top and bottom tension roller, and 18 is a hydraulic cylinder.
The cutting tool 7 can be pressed against the inner bead by the reaction force. 3 indicates a joining point of the raw pipe 1A.

As shown in Fig. 2, a hydraulic cylinder 1 is attached to the inner bead of the ERW pipe 1 which is being made and sent in the direction of the arrow.
8. Press the cutting tool 7 with the upper and lower tension rollers 8. Next, the shape of the inner bead after cutting is observed, or the positional relationship between the cutting tool 7 and the inner bead is detected by a known means such as a fiber scope, and if a positional deviation occurs, the hydraulic motor 15 is driven. .

For example, if the inner bead B deviates to the left in the tube circumferential direction by an amount W as shown in FIG. After making contact with the inner surface of the tube, when the arm 13 is moved by an amount W in the direction of the arrow, the cutter body 4 moves toward the inner bead B due to the reaction force, and the positions of the cutting tool 7 and the inner bead B are aligned. .

At this time, if the electric resistance welded tube 1 oscillates laterally in the pressing direction of the position adjustment roller 12B, a positional shift occurs between the cutting tool 7 and the inner bead. The first way to prevent this is to
The hydraulic cylinder 17 shown in the figure is extended and the guide rollers 16, 16 are brought into contact with both sides of the inner surface of the tube as shown in FIGS. 3c and 3d. Furthermore, when the cutting tool 7 moves from FIG. 3a to FIG. 3b, the cutting tool 7 needs to move slightly downward, but this movement is caused by the contraction of the hydraulic cylinder 18 shown in FIG. It is possible by In addition, as a remote control method for the position adjustment roller 12, the amount of deviation is determined from the shape of the cutting surface due to chipping of the inner bead caused by the positional deviation in the bead width direction between the inner bead and the cutting tool 7, and this amount of deviation is calculated by the hydraulic motor 15. There is a way to input it to the control system.

[Effects of the invention] As described above, the invention makes it possible to accurately adjust the position of the inner bead cutter in the bead width direction, thereby preventing cutting defects such as uncut parts in the inner bead width direction and line stoppage. Remarkable effects such as being able to prevent a decrease in work efficiency and yield due to reduction can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a plan sectional view showing a bead cutter according to an embodiment of the present invention, Fig. 2 is a sectional view of the same side, Fig. 3 a, b,
Figures c and d are diagrams for explaining the operation of the present invention, Figure 4 is a diagram showing an example of an electric resistance welded tube manufacturing apparatus, and Figures 5, 6, and 7 are diagrams showing a conventional apparatus. 1... ERW pipe, 2... Roll group, 3... Junction point, 4... Cutter body, 5... Mandrel rod, 6... Inner bead cutter, 7... Cutting tool, 8... Upper and lower tension rollers , 9...Koro, 10...
... Cutting tool holder, 11 ... Adjustment liner, 12 ... Position adjustment roller, 13 ... Roller support arm, 14 ... Worm jack, 15 ...
Hydraulic motor, 16... Guide roller, 17...
Hydraulic cylinder, 18...Hydraulic cylinder.

Claims (1)

[Scope of utility model registration request] A cutter body 4 fixedly provided at the tip of a mandrel rod 5 inserted into an ERW pipe during pipe making;
A cutting tool 7 is provided on the cutter body 4 to protrude from the top surface, a vertical tension roller 8 is provided on the cutter body 4 so as to protrude from the bottom surface and is movable up and down, and a tension roller 8 is provided on the cutter body 4 so as to protrude from the left and right sides and is movable in the left and right directions. An inner bead cutter for electric resistance welded pipes, which is composed of a position adjustment roller 12.