JPS5841071Y2 - Pipe end cutting device for steel pipe materials - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pipe end cutting device used for cutting the ends of steel pipe materials such as seamless steel pipes and electric resistance welded steel pipes.

In general, with electric resistance welded steel pipes, it is necessary to take and cut test pieces from the pipe ends to check the degree of weld seam, and even in the case of seamless steel pipes, it is necessary to cut the pipe ends, which tend to be defective parts.

Conventionally, cutting devices that do not require subsequent processing operations such as burr removal work have been used as end cutting devices for steel pipe materials, such as cutting devices that use parting tools and cutting tools, but they have difficulties in handling chips and are difficult to use with tools. The lifespan and cutting efficiency were low.

In recent years, a rotary cutting device for pipes using a circular saw machine has been considered, which is advantageous in terms of chip disposal, tool life, and cutting efficiency, but this machine cuts the steel pipe material with a rotating circular saw blade while rotating. When this is used to cut the end of steel pipe material, the rotation of the pipe end cannot follow the rotation of the base of the steel pipe material at the end of the pipe end cutting, and the amount of cut into the saw blade increases instantaneously. This causes a problem that can damage the saw blade.

As a way to prevent the above-mentioned problems, it is conceivable to drive and rotationally support the end of the tube using a separate drive system that is synchronously controlled with respect to the motor that drives and rotates the steel pipe material, but this would make the entire device large and expensive. There are drawbacks.

The present invention was made to eliminate the above-mentioned conventional drawbacks, and the pipe end member is supported on the steel pipe base by a tube inner rotation clamp device, so that the pipe end member always rotates in synchronization with the steel pipe base. The present invention aims to provide a tube end cutting device which can make the entire device small and inexpensive, and which can perform light cutting over a long period of time without causing damage to the saw blade.

The embodiment will be explained below with reference to the drawings. First, reference numeral 1 in the figure is a bed, and on the bed 1, in order from the right side, a tube outer surface rotating clamp device 2, a saw cutter 3, and a tube inner surface rotating clamp device 4 are installed. They are arranged side by side so that they form a core.

The tube outer surface rotating clamp device 2 has the following structure.

That is, the frame 6 is slidably supported on a sliding table 5 integrated with the bed 1.

A rotary sleeve 8 is rotatably held within this frame 6 via a bearing 7.

A worm gear 9 is fixed to the outer periphery of the rotating sleeve 8, and a multi-lead worm 10 is meshed with the worm gear 9, and the rotation of the motor 11 mounted on the frame 6 moves the reducer 12 → deflection joint 13 → multi-lead worm 10. →The structure is such that the rotary sleeve 8 can be driven and rotated by the path of the worm gear 9.

The rotary sleeve 8 includes a gripping pawl 14 having an inclined surface on its back surface and a slider 15 having an inclined surface facing the inclined surface of the gripping pawl 14.

Reference numeral 16 is a rotary joint which is slidably supported by a cylindrical body 17 fixed to the outer wall of the rotary sleeve 8, the inner member of which is connected to the slider 15, and the outer member fixed to the outer side of the frame 6 and arranged at regular intervals. It is connected to each piston rod of three sets of hydraulic cylinders 18 arranged.

19 is a hydraulic cylinder for moving the tube outer surface rotating clamp device 2, and 35 is a slip key for preventing rotation of the rotary joint 160.

Next, the saw cutter 3 will be explained.

Reference numeral 20 denotes a saw blade with a built-in reduction transmission device, which is equipped with a saw blade 21 at its inner end and a motor 22 at its outer end, and the rotation of this motor 22 drives the saw blade 21 through the reduction transmission device. It has a structure that allows it to be driven and rotated.

23 is a ball screw screwed into the side wall member of the saw blade 20;
4 is a reduction transmission device, 25 is a pulse motor, and these 23
, 24.

25 constitutes a feeding device for the saw blades 20.

36 is an electromagnetic brake. Tube inner rotation clamp device 4
has the following structure.

That is, 26 is a rod whose base end is attached to a support base 27 so that it can extend and retract through the frame of the saw cutter 3 by means of a telescopic drive device (not shown).

A clamp head 29 equipped with a clamp chuck 28 is connected to its tip by a rotary joint 30 that serves both as an oil passage and as a support.

The hydraulic cylinders 3 of the clamp chuck 28 are placed on both sides of the saw blade movement line, which is the maximum extension of the rod 26.
It is set so that 1 is located.

The clamp head 29 is a clamp chuck 2 consisting of hydraulic cylinders 31 that extend and retreat in the radial direction at three locations in the circumferential direction.
8 are arranged side by side in the axial direction in two sets, each with a variable operating amount.

This clamp head 29 is inserted into the steel pipe material 32 which is inserted and fixed into the above-mentioned tube outer surface rotary clamping device 2, and is configured to clamp two axially inner surfaces of the steel pipe material 32.

33. 34 is a pressure oil supply/discharge path for each of the six cylinders, 37
is a screw conveyor for carrying out chips.

In the above embodiment, the hydraulic cylinder 31 constituting the clamp chunk 28 is a single-acting type, and its piston rod is retracted by a spring. You can also do this.

Moreover, a clamp rod and a suitable operating mechanism may be used in place of the hydraulic cylinder and its operating piping constituting this clamp chuck.

Since the present invention is constructed as described above, when cutting the end of a steel pipe material such as a seamless steel pipe or an electric resistance welded steel pipe, the steel pipe material 32 is first loaded into the pipe outer surface rotating clamping device 2, and the saw cutting is performed. The steel pipe material 32 is made to protrude an appropriate amount toward the machine 3 side, and the hydraulic cylinder 18 is operated to clamp the steel pipe material 32.

Next, the rod 26 of the tube inner rotation clamping device 4 is extended, passes through the frame of the saw cutter 3, and the hydraulic cylinder 31 of the clamp chuck 28 installed on the clamp head 29 at the tip of the rod crosses the saw blade movement line. The clamp head 29 is inserted from the end face into the steel pipe material 32 to be cut so as to be located on both sides.

Thereafter, pressure oil is supplied to the hydraulic cylinder 31 of the clamp chuck 28 to clamp the steel pipe material 32 at two locations on the inner surface in the axial direction.

Thereafter, when the saw blade 21 of the saw cutter 3 is driven and rotated by the motor 22 and fed, the tube wall is partially cut off.

It will be done.

When the pipe wall is torn, only the feed is stopped, and the pipe outer surface rotating clamp device 2 is activated to rotate the steel pipe material 32 once, thereby cutting and separating the steel pipe material 32 and the pipe end member 32'.

Since the steel pipe material 32 and the pipe end member 32' are integrated by the clamp head 29 inside thereof, the pipe end member 32' always rotates in synchronization with the steel pipe material 32.

Therefore, when cutting with the saw blade 21, it is possible to cut smoothly and beautifully without causing any jerking phenomenon, and without causing burrs or the like.

After cutting, the tube end member can be easily removed by removing the clamp chuck on the steel pipe side of the clamp head 29 and removing the tube end member side clamp chuck together with the Rondo reduction operation.

When cutting the end of a new steel pipe material, the same operation as described above may be performed.

As described above, according to the present invention, when cutting the pipe end of a steel pipe material, the pipe end member is supported by the tube inner surface rotating clamp device against the steel pipe material to be cut, and the pipe end member always rotates in synchronization with the steel pipe material. This eliminates the so-called jerking phenomenon in which the depth of cut against the saw blade increases instantaneously at the end of cutting the pipe end, thereby preventing damage to the saw blade as much as possible and making the pipe end cutting work more efficient. It can be cut easily over a long period of time, and the steel pipe material itself can be finished beautifully without any burrs on the cut surface, so it can be made into products immediately or eliminates the need for subsequent processing. It has the effect of making a good industry leader.

Furthermore, since the clamp head is configured to separately operate clamp chucks on the inner surface of the tube at two locations in the axial direction, the rond can be reduced while cutting the tube end member, passed through the frame of the saw cutter, and left as it is. By transporting the tube end member to the next step, for example, a strength testing machine or a scrap box, and loosening the piston rod of the holding cylinder at that point, the tube end member can be processed quickly and easily.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the tube end cutting device according to the present invention, Fig. 2 is a partially cutaway side view taken along line A in Fig. 1, and Fig. 3 is a clamp taken along line B in Fig. 1. FIG. 3 is an enlarged side sectional view of the head. 2... Pipe outer surface rotating clamp device, 3...
・Saw cutting machine, 4...Tube inner surface rotating clamp device, 2
8... Clamp chuck, 29... Clamp head.

Claims (1)

[Scope of utility model registration request] A tube outer surface rotating clamp device that rotationally clamps the outer surface near the tube end and rotates the tube, a sawing machine adjacent to the tube outer surface rotating clamping device, and a sawing machine on the opposite side of the tube outer surface rotating clamping device. and a rotary clamp device for rotating the inner surface of the tube, which has a rond that is installed on a support stand provided on the saw cutter and that is freely retractable through the frame of the saw, and a clamp head that is rotatably supported at the end of the rond. Axial direction 2
1. A pipe end cutting device for steel pipe material, characterized in that a clamp chuck on the inner surface of the pipe is operated separately at each location.