JPH0432169Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a rotary disc cutter type steel pipe running cutting device.

(Technical background) An example of a manufacturing method in continuous round steel pipe manufacturing equipment is to create a round steel pipe from a hot-rolled coil through manufacturing equipment and welding equipment, and then cut it with a running cutting machine to obtain a specified pipe length. . Conventionally, running cutting machines used in continuous round steel pipe manufacturing equipment have used a press cutting method that uses a sharp V-shaped blade to cut small diameter pipes, and a disc cutter (as shown in Figure 2) for medium diameter pipes and larger pipes. A plurality of round sharp blades attached to a swingable rocker arm are strongly pressed against the material to be cut, and the disk cutter is further rotated by a revolving rotating body to cut the material. This rotary disc cutter type inter-travel cutting machine has been widely used because it can cut with low noise and without producing cutting waste during the inter-travel process.

However, in recent years, the demand for steel pipes has increased with increased wall thickness and high tensile strength steel, and
As the performance of welding machines installed in pipe-making equipment improves, the speed of pipe-making is also increasing.

As a result, the wear of the disc cutter in such high-speed, high-load cutting machines increases, and the frequency of replacement of the disc cutter increases two to three times compared to conventional methods.Moreover, improvements in the performance of welding machines have made it easier to manufacture pipes. Since the speed is faster and the production volume is increasing, the high frequency of replacement has an extremely large effect on the production volume.

(Prior Art) Fig. 2 shows a disk cutter type running cutting machine, in which a steel pipe 32 formed into a round shape in continuous round steel pipe manufacturing equipment is continuously passed through the body of the disk cutter type cutting machine. The spindle 17 on which the disc cutter 1 is disposed is always rotated through a pinion gear 3 by a spindle rotation motor 2.

When a cutting signal is input, the cutting machine truck 4 drives the cutting machine truck drive motor 6, rotates the pinion gear 7, and synchronizes the speed with the steel pipe 32 by the rack 13 attached to the lower surface of the cutting machine truck 4. . After synchronization, the steel pipe 32 is firmly clamped by a hydraulically driven clamping device 16 attached to the cutting machine cart 4. Therefore, the cutter truck 4 is integrally engaged with the steel pipe 32. At that point, hydraulic cylinder 1
8, the cam member 1 is moved against the spindle 17.
7' in the axial direction of the steel pipe, the rocker arm 12 pivotally supported on the spindle 17 is swung by the action of the cam member 17', and the cutter base 9, slider 10, and cutter mounting base 5 are moved via the slider pin 11. The disc cutter 1 moves in the radial direction of the steel pipe 32, thereby causing the disc cutter 1 to move in the radial direction of the steel pipe 32 and perform cutting. Note that 8 is a screw shaft for adjusting the opening and closing of the cutter mount 5 according to the diameter of the steel pipe.

(Problem that the invention aims to solve) In recent years, the demand for steel pipes has increased with increasing wall thickness and material strength, such as high tensile strength steel.
Steel pipes exceeding 100Kg/mm ² cannot be cut unless an excessive load is applied to the disc, and applying an excessive load may lead to damage to the disc, and even if it can be cut, the life of the disc will be extremely shortened. As a result, the disc cutter has to be replaced more frequently, resulting in a reduction in production.

(Means for Solving the Problems) The steel pipe running cutting device according to the present invention solves the above problems, and is designed to clamp a traveling steel pipe and use a cutting machine trolley that travels at the same speed as the steel pipe. Above, in a steel pipe running cutting device equipped with a rotary disc cutter for cutting steel pipes, the rotary disc cutter and a high frequency induction heating device having a ring-shaped high frequency induction heating coil can be cut in the axial direction of the steel pipe. arranged in close proximity to each other,
A cutter support that supports the rotary disk cutter and the high-frequency induction heating device, and a moving cylinder that moves the cutter support in the direction of the steel pipe axis are provided on the cutting machine truck, and the moving stroke of the moving cylinder is It is characterized in that the distance is equal to the distance from the center of the rotary disc cutter to the center of the high frequency induction heating coil.

(Function) The present invention can cut the steel pipe by clamping the steel pipe while the pipe is running, heating the cutting section, and quickly shifting the rotary disk cutter to the heating center where the temperature of the heated section is highest.

Therefore, since the cutting part is at a high temperature, the cutting resistance is significantly reduced, and the rotary disc cutter can now cut extremely easily in a short time with a light load.

(Embodiment) FIG. 1 shows an embodiment of the present invention. In FIG. 1, a high frequency induction heating device H having a high frequency induction heating coil 22 formed in a ring shape on a cutting machine truck 4 and a rotary disk cutter 34 are shown.
are provided on the cutter support 33 via members 22' and 19', respectively. The high-frequency induction heating coil and the blade of the rotary disk cutter are placed as close as possible in the axial direction of the steel pipe in order to shorten the travel time of the cutter support as much as possible and prevent the heating temperature of the steel pipe from decreasing. Arrange in position. In this embodiment, the interval between the high-frequency induction heating device and the rotary disk cutter is set so that there is no interference between them, and in consideration of maintenance, for example,
It is 200mm, and in this way the movement time can be as short as about 2 seconds. The cutter support is movably provided on a support guide 20 disposed on the cutter truck 4. The cutter support is then moved by the moving cylinder 21. The amount of movement of the moving cylinder is approximately the same as the distance between the center of the high-frequency induction heating coil and the center of the rotary disk cutter.

A spindle 17 is rotatably fitted on the outer periphery of the spindle support 19 via a bearing. A cutter mount 5 is disposed on the spindle 17, and a disk cutter 1 is disposed on the cutter mount 5. The moving device (hydraulic cylinder) 18, cam member 17', rocker arm 12, cutter stand 9, slider 10, slider pin 11, screw shaft 8, and cutter mount 5 shown in FIG. 1 are explained in FIG. The process is similar to that described above, and the disc cutter 1 is moved in the radial direction of the steel pipe to cut the steel pipe.

Accordingly, in the present invention, as shown in FIG. 1, a high frequency induction heating device H is disposed on a cutter support 33 to which a rotary disk cutter 34 is attached, and the cutter support 33 is connected to a cutter support guide 20. It is made movable in the longitudinal direction of the tube by a moving cylinder 21.

That is, until the steel pipe 32 and the cutting machine cart 4 are synchronized and clamped by the clamp device 16,
This is the same as the conventional disk cutter type cutting machine, but after that, the cut part of the steel pipe 32 is heated to an appropriate temperature by the high frequency induction heating coil 22, and after the heating is completed, the cutter support 33 is heated by the moving cylinder 21.
is moved in the pipe length direction and the disc cutter 1 is moved to the heating section, and then the disc cutter is closed in the radial direction of the steel pipe via the hydraulic cylinder 18, rocker arm 12, slider 10 and slider mounting pin 11. Make the cut.

(Effects of the invention) (a) With the conventional rotary disc cutter,
The rotary disc cutter can be used to cut thick, high tensile strength steel pipes that cannot be cut, or even if they can be cut, the discs often break.The rotary disc cutter can be used with less noise and generates no chips. Each step became wider.

(b) Since the cutting life of the disc cutter is extended, the frequency of replacing the disc cutter is reduced, making it possible to significantly improve the productivity of steel pipes.

(c) Even if heating time with a high-frequency induction heating coil is added, the tensile strength is reduced and the cutting time is shortened, making it possible to cut thick steel pipes with high tensile strength in a short time. Improved cutting ability can be measured.

(d) By adjusting the frequency, heating width, and heating time in high-frequency induction heating, the cutting load can be reduced and the cutting shape can be reduced even for thin-walled steel pipes, where the drawing shape at the pipe end is a problem with conventional disc cutter types. can be improved.

It has many advantageous features such as
Significantly more effective than conventional cutting devices.

[Brief explanation of drawings]

FIG. 1a is a longitudinal cross-sectional view of a device according to an embodiment of the present invention, FIG. 1b is a cross-sectional view taken along line A-A in FIG. 1a, and FIG. H... High frequency induction heating device, 1... Disk cutter, 4... Cutting machine trolley, 12... Rocker arm, 14... Cutting machine wheel, 15... Rail, 1
6... Clamp device, 17... Spindle, 19
... spindle support, 20 ... cutter support guide, 21 ... moving cylinder, 22 ... high frequency induction heating coil, 32 ... steel pipe, 33 ... cutter support, 34 ... rotary disk cutter.

Claims (1)

[Scope of Claim for Utility Model Registration] In a steel pipe running cutting device that clamps a traveling steel pipe and is equipped with a rotary disc cutter for cutting the steel pipe on a cutting machine truck that travels at the same speed as the steel pipe, a rotary disc A cutter and a high-frequency induction heating device having a ring-shaped high-frequency induction heating coil are arranged as close as possible in the axial direction of the steel tube, and a cutter support that supports the rotary disk cutter and the high-frequency induction heating device and a moving cylinder that moves the cutter support body in the direction of the steel pipe axis are provided on the cutting machine truck, and the moving stroke of the moving cylinder is equal to the distance from the center of the rotary disk cutter to the center of the high-frequency induction heating coil. A running cutting device for steel pipe, characterized in that it is made of equal parts.