JPS5813284B2 - Internal bead cutting device for ERW pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for cutting the inner bead of an ERW tube after welding in the process of manufacturing the ERW tube, and is an inner bead cutting apparatus particularly suitable for manufacturing small diameter ERW tubes. be.

As is well known, weld beads are generated on the inner and outer surfaces of the welded parts of ERW pipes after welding in the manufacturing process of ERW pipes. The weld bead is removed by cutting.

A conventional internal bead cutting device for cutting this internal bead is as shown in FIG. ' A cutter 4 is provided at the rear of the roller to cut the inner bead, or a long hole in the vertical direction is provided in the bearing part of the lower roller 3 shown in Fig. 1, and the lower roller is pressed downward by a leaf spring. Furthermore, there is a type in which the lower roller 3 shown in FIG. 1 is held in a roller holder made of a leaf spring and supported at one end.

In addition, there are types in which the lower roller is pressed from above with a hydraulic cylinder, etc., and types in which the lower roller is supported at one end with a roller holder and this roller holder is pressed from above with a hydraulic cylinder. These types are effective for manufacturing small-diameter ERW tubes, but these types cannot be used for manufacturing small-diameter ERW tubes because the inner diameter of the tube is small.

Among the inner bead cutting devices mentioned above, which are mainly used for small-diameter electric resistance welded pipes, with regard to the type (■), if the inner diameter of the pipe is changed even slightly, the lower roller 3 must be replaced to match the inner diameter. In the case of (2), although it is possible to accommodate some changes in the inner diameter, the common range of the inner diameter of the tube is narrow, and it is difficult to adjust the pressing force of the lower roller.

Further, in case (2), there are disadvantages in that the common range of the inner diameter of the tube is relatively narrow and that it is very difficult to adjust the pressing force of the lower roller to an appropriate value.

The present invention eliminates the drawbacks of the conventional apparatus described above, has a wide range of common pipe inner diameters, and can cut the inner bead with a moderate pressing force even if the inner diameter of the pipe is changed, especially for small-diameter ERW pipes. The purpose of the present invention is to provide an apparatus for cutting the inner surface of an electric resistance welded pipe suitable for manufacturing.

That is, the present invention provides an inner bead cutting device used in the manufacturing process of electric resistance welded pipes, which includes an elastic body provided to be expandable and contractible in the axial direction of the cutting device body, a cylinder connected to the elastic body, and a cylinder connected to the cylinder. This is an inner bead cutting device for an electric resistance welded pipe, characterized by comprising a lower roller holder having a lower roller connected and rotatably provided.

Next, the configuration of the apparatus of the present invention will be explained in detail with reference to the embodiments shown in FIGS. 2 to 4.

FIG. 2 is a sectional view showing one embodiment of the inner bead cutting device of the present invention, FIG. 3 is a plan view of the inner bead cutting device shown in FIG. 2, and FIG. FIG.

For convenience of explanation, the embodiment shown in FIGS. 2 and 3 will be mainly described.

In the figure, 5 is a cutting device main body, and two upper rollers 6 and 6' are rotatably attached to the upper part of the cutting device main body 5, and an inner bead is cut behind the upper roller 6'. A cutter 7 is detachably provided.

Reference numeral 8 denotes a coil spring which is an elastic body provided so as to be expandable and retractable in the axial direction of the cutting device main body. In this embodiment, this coil spring 8 is installed inside the cutting device main body 5, and is located at its front end (the left side in FIG. 2). ) is fixed to the cutting device main body 5,
The rear end (right side in FIG. 2) is extendable and retractable via a spring receiver 9.

23 is a cylinder provided in connection with the elastic body, and this cylinder 23 consists of a first cylinder part 10 and a second cylinder part 12, and the first cylinder part 1
0, as shown in FIG. 2, a cylinder hole is provided inside the cutting device main body 5, and a cylinder rod 11 is slidably provided in the cylinder hole.
The front end (left side in FIG. 2) is in contact with the rear end of the spring receiver 9, and is actuated in the axial direction of the cutting device main body 5 by the pressing force of the coil spring 8.

As shown in FIG. 2, the second cylinder part 12 has a cylinder hole diagonally provided inside the cutting device main body 5, and a cylinder rod 13 is slidably provided in the cylinder hole. The second cylinder part 12 and the first cylinder part 10 are connected via a communication hole 14.

The communication hole 14 is filled with oil supplied from the plug 15.

Reference numeral 16 denotes a lower roller holder rotatably provided in connection with the cylinder, and as shown in FIGS. 2 and 3, this lower roller holder 16 has a lower roller 17 rotated by a shaft 18 at its lower part. The cylinder rod 13 of the second cylinder part 12 comes into contact with the tip of the cylinder rod 13 of the second cylinder part 12. It is designed to rotate by the pressing force of the cylinder 23.

In this embodiment, a coil spring is provided inside the cutting device main body as an elastic body that is extendable and retractable in the axial direction of the cutting device main body, but the present invention is not limited to this. As shown in FIG. 4, a coil spring may be provided on the outer surface of the main body of the cutting device, and in addition to the coil spring, an elastic body such as a disc spring may be used as the elastic body.

Next, for convenience of explanation, the operation of this device will be explained in detail with reference to the embodiment shown in FIGS. 2 and 3.

When the inner bead cutting device in the state shown in FIG. 2 is inserted into the inner surface of the ERW pipe K that is continuously manufactured, the lower roller 17 of the inner bead cutting device is pushed upward, and accordingly, the lower roller 17 The lower roller holder 16 holding the cylinder also rotates around the shaft 19, and the tip of the lower roller holder 16 presses against the cylinder rod 13 of the second cylinder part 12, and the pressing force of the cylinder rod 13 is communicated. The cylinder rod 11 of the first cylinder 10 is pressed through the oil in the hole 14.

The pressing force of the cylinder rod 11 presses the coil spring 8 via the spring receiver 9.

Therefore, the inner bead cutting device cuts the inner surface of the electric resistance welded pipe K.
The upper part is in contact with the inner bead by the upper rollers 6, 6', and the lower part is pressed against the lower surface of the ERW tube K by the lower roller 17, which receives an appropriate pressing force from the coil spring 8, so that the inner bead can be cut. The cutter 7 can always cut the inner bead with an appropriate pressing force.

The inner bead cutting device of the present invention can increase the amount of deflection of the elastic body such as a coil spring, so the inner diameter of the ERW pipe to be manufactured can be widely used, and even if the inner diameter changes, the inner bead can be cut with almost constant pressing force. can be cut.

Next, another embodiment of the inner bead cutting device of the present invention shown in FIG. 4 will be described.

The embodiment shown in FIG. 4 shows an inner bead cutting apparatus which is particularly suitable for manufacturing small diameter electric resistance welded tubes.

As shown in FIG. 4, in the inner bead cutting device of this embodiment, the coil spring 8' is attached to the cutting device main body 5l in order to make the spring into a slender shape without reducing the amount of deflection of the spring.
As shown in the figure, the spring receiver 9' has a structure in which both ends of a pin 22 inserted into a long hole 21 extending perpendicularly to the axis of the cutting device main body 5' are fixed to the sleeve 20. The structure is such that the spring receiver 9' can slide in the axial direction of the cutting device main body 5' along the long hole 21 by the pressing force of the coil spring 8', and the other parts are as shown in FIGS. The structure is almost the same as that of the embodiment shown in FIG.

Since the present invention is an inner bead cutting device for an ERW pipe as described above, it is possible to increase the amount of deflection of the elastic body, so the inner diameter of the ERW pipe to be manufactured is wide, and the inner diameter of the pipe is Even if the inner diameter is changed, the inner bead can always be cut with an appropriate pressing force.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a conventional inner bead cutting device, FIG. 2 is a sectional view showing an embodiment of the inner bead cutting device of the present invention, and FIG. 3 is the inner bead cutting device shown in FIG. 2. FIG. 4 is a sectional view showing another embodiment of the internal bead cutting device of the present invention. 5, 5'... Cutting device main body, 8, 8'... Coil spring, 16, 16'... Lower roller holder, 17,
17'... lower roller, 23, 23'... cylinder.

Claims (1)

[Claims] 1. In an inner bead cutting device used in the manufacturing process of electric resistance welded pipes, an elastic body provided to be expandable and retractable in the axial direction of the cutting device body, a cylinder connected to the elastic body, and a rotatable body connected to the cylinder are used. 1. An inner bead cutting device for an electric resistance welded pipe, comprising a lower roller holder having a movably provided lower roller.