JPH076993Y2 - Metal pipe end processing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The metal pipe end processing machine according to the present invention is used for processing a taper screw on the end of a metal pipe for transferring various fluids. .

(Prior Art) When connecting the end of a metal pipe for transferring various fluids to a joint such as an elbow, when forming a taper screw having an outer diameter that decreases toward the tip at the end of this metal pipe There are many.

The work of forming such a taper screw was previously performed by cutting, but in recent years it has become possible to form such a taper screw by rolling. When making a screw by rolling, the screw groove is formed by crushing the outer peripheral surface of the end of the metal pipe, so the metal material of the screw groove becomes dense, and the strength of the screw made is in the case of cutting. Greatly improved compared to.

5 to 6 show a conventional metal pipe end processing machine used when performing such taper screw forming work and the like.

This metal pipe end processing machine is provided with a plastic processing machine 2 on one side of the upper surface of the base 1 (front side of FIG. 5, right side of FIG. 6) for narrowing the end of the metal tube into a tapered shape. , A rolling machine 3 is provided on the other side of the upper surface, and the tip end of the metal pipe for which a taper screw is to be formed at the end is drawn by the plastic working machine 2 into a tapered shape, and then rolled. The machine 3 forms a male screw on the outer peripheral surface of the drawn portion.

When performing a drawing process for forming the tip of the metal pipe into a tapered shape, the metal pipe to be drawn is formed by the plastic working machine 2
With the through hole 5 of the clamp mechanism 4 constituting the
It is held down by a hydraulic cylinder 6 that constitutes the clamp mechanism 4, and another hydraulic cylinder 7 arranged coaxially with the through hole 5 presses a drawing die having a tapered hole toward the tip of the metal pipe. .

When the drawing die is strongly pressed against the tip, the metal tube is tapered so that its tip follows the inner peripheral surface of the tapered hole provided in the drawing die.

As mentioned above, the metal pipe with the tapered tip is
After being pulled out from the through hole 5 of the clamp mechanism 4, it is inserted into the through hole 8 of the rolling machine 3 provided next to it.

In the drum-shaped casing 9 that constitutes the rolling machine 3, a plurality of rolling dies that are movable in the radial direction by hydraulic cylinders are provided. While being strongly pressed to the outer peripheral surface of the end portion of the metal pipe by the hydraulic cylinder, the metal cylinder rotates around the outer peripheral surface of the metal pipe to form a male screw by rolling on the outer peripheral surface of the end portion of the metal tube. During this rolling process, a coolant (cooling oil) is poured on the outer peripheral surface of the end of the metal tube to suppress the temperature rise due to the process.

Inside the base 1, a tank 1 for storing hydraulic oil for the hydraulic cylinders 6 and 7 in addition to the coolant
0, 11 are provided, and pressure oil pumps 12, 1 attached to each tank 10, 11
The oil provided in the tanks 10 and 11 can be sent out to a predetermined portion by the hydraulic pressure switching valve 14 provided inside the base 3 and the hydraulic pressure changeover valve 14. Reference numeral 15 is a motor also provided inside the base 1, which rotates a rotary shaft communicating with the rolling die through a belt to rotate each rolling die around the metal tube.

(Problems to be solved by the invention) However, the conventional metal pipe end processing machine configured and used as described above is only a large stationary type machine, and it is not always possible to effectively utilize the machine.

For example, in building sites of buildings, male threads are often formed at the ends of metal pipes for piping, but in the case of conventional processing machines, it is a small-scale building site that does not have a crane, etc. If is narrow, large and heavy (for example, about 500 kg)
It was difficult to carry in the processing machine, and it was difficult to perform male screw forming work on site.

For this reason, the present inventor combined the constituent parts of the metal pipe end processing machine so that they can be disassembled and assembled, and disassembles the constituent parts at the time of carry-in, so that a crane can be installed on a small scale. We thought about making it possible to install a metal pipe end processing machine even in a small field.

In the case of disassembling and disassembling the constituent parts, the constituent parts are connected to the base 1 by bolts (studs) and nuts, and a part of the hydraulic circuit is constituted by a pressure hose. And the end of the hydraulic passage provided in each of the above-mentioned components are detachable by a one-touch connection plug.

In this way, by disassembling and assembling each component of the metal pipe end processing machine, the processing machine can be disassembled,
Although it can be used by being manually loaded into a construction site and assembled after being assembled on the site, simply disassembling and assembling a processing machine having the structure shown in FIGS.
Even after dismantling, the base 1 with the tanks 10 and 11 incorporated
It is difficult to carry by hand because the weight of the

The metal pipe end processing machine of the present invention eliminates the above-mentioned inconvenience.

(Means for Solving the Problem) The metal pipe end processing machine according to the present invention is clamped in accordance with the feeding of the pressure oil to the clamp cylinder, similarly to the conventional metal pipe end processing machine described above. In a plastic working machine having a clamp mechanism for displacing the die to hold down the metal pipe to be machined, and a first hydraulic cylinder for pressing the machining die against the tip of the metal pipe fixed by the clamp mechanism, It is configured by combining a rolling machine for plastically working the outer peripheral surface of the tip portion by pressing a rolling die on the outer peripheral surface of the tip portion of the metal pipe with a hydraulic cylinder.

However, in the metal pipe end processing machine of the present invention, the pressure oil supply source to the clamp cylinder, the first hydraulic cylinder and the second hydraulic cylinder is the same, and A force increasing mechanism using a taper cam is provided between the clamp die and the clamp die.

(Function) The metal pipe end processing machine of the present invention configured as described above may be used to draw the tip of the metal pipe, or a male screw may be formed on the outer peripheral surface of the metal pipe by rolling. The operation itself when doing is the same as that of the conventional metal pipe end processing machine described above.

However, in the case of the metal pipe end processing machine of the present invention, since the pressure oil supply source to the clamp cylinder, the first hydraulic cylinder and the second hydraulic cylinder is the same, the pressure oil supply source is simplified. This makes it possible to reduce the size and weight of the entire processing machine,
It becomes easy to disassemble the processing machine and transport it manually.

In this case, since the force increasing mechanism by the taper cam is provided between the clamp cylinder and the clamp die,
The pressure of the pressure oil sent to the first hydraulic cylinder and the clamp cylinder are made the same, and moreover, the metal pipe is reliably fixed by the clamp mechanism without increasing the diameter of the clamp cylinder.

(Embodiment) Next, the present invention will be described in more detail with reference to the illustrated embodiment.

1 to 4 show an embodiment of a metal pipe end processing machine according to the present invention. FIG. 1 is a side view, FIG. 2 is a view seen from the left side of FIG. 1, and FIG. 1 is an enlarged side view showing only the upper part of FIG. 1, and FIG. 4 is an enlarged side view showing the left half part of FIG.

This metal pipe end processing machine has casters 16 provided on the lower surface,
On the upper surface of the base 17 which can be moved freely by 16 is a kind of plastic working machine, a drawing machine 18 for tapering the end of the metal pipe and the end of the tapered metal pipe. The outer peripheral surface is provided with a rolling machine 19 for forming a male screw.

The drawing machine 18 has a sufficient rigidity and is configured by connecting two support plates 25a and 25b arranged in parallel to each other by connecting rods 24 and 24. A clamp mechanism 20 for holding down a metal pipe to be machined is fixed to the inner surface of one of the support plates 25a, and a machining die having a tapered hole is provided at the tip of the metal pipe fixed by the clamp mechanism 20 (not shown). The first hydraulic cylinder 21 that presses the () is fixed to the outer surface of the other support plate 25b.

The clamp mechanism 20 is, as shown in detail in FIGS. 3 to 4, a hydraulic clamp cylinder 22 fixed to the inner surface of the other supporting plate 25b, and a hydraulic oil to the clamp cylinder 22. The rod pushed to the left in Fig. 1 as it is supplied.
23, and a clamp die 38 which is built in the clamp case 32 and is pressed against the upper surface of the metal pipe via the taper cam 37 as the rod 23 moves to the left.

That is, in the clamp case 32, a taper cam 37 having an inclined surface 39 formed on the upper surface is provided on the upper surface of the clamp die 38 which is supported only for vertical movement.
The pressing piece fixed to the tip of the rod 23 on the inclined surface 39 of
The lower surface of 40 is in sliding contact. The upper surface of the pressing piece 40 is in sliding contact with the lower surface of the guide plate 41 provided at the upper end of the clamp case 32, and as a result, the clamp die 38 is
The rod 23 is pushed out as the pressure oil is fed into the clamp cylinder 22, so that the rod 23 is pushed down with a strong force.

Further, the working die having the tapered hole is pressed against the end of the metal pipe fixed by the clamp mechanism 20 through the pressing rod 26 by the supply of the pressure oil to the first hydraulic cylinder 21. ing.

Further, the rolling machine 19 includes a plurality of (three in the normal case) rolling processes which are radially displaceable inside the drum-shaped casing 27 by a second hydraulic cylinder (not shown). It is configured by providing a die (not shown) and a nozzle (not shown) for pouring a coolant on the outer peripheral surface of the tip portion of the metal tube inserted in the center of the casing 27,
When a male screw is formed at the end of a metal pipe, the tip outer peripheral surface is made plastic by pressing the rolling die onto the outer peripheral surface of the metal pipe while pouring coolant onto the outer peripheral surface. It is deformed and a male screw is formed in this portion.

The drawing machine 18 and the rolling processing machine 19 as described above are provided on the upper surface of the base 17 provided on the upper surface thereof, in addition to the both processing machines 18 and 19,
An oil supply mechanism for supplying oil to each processing machine 18, 19 is provided.

That is, a low-pressure oil pump 28 for supplying the coolant to the nozzle for the coolant is provided on the upper surface of the intermediate portion of the base 17, and the first hydraulic cylinder 21 and the second hydraulic cylinder 21 and the second hydraulic cylinder 21 are provided on the upper surface of the end portion of the base 17. High-pressure oil pumps 29 for feeding hydraulic oil to the hydraulic cylinder and the clamp cylinder 22 are provided respectively.

As described above, the drawing machine 18, the rolling machine 19, the low-pressure oil pump 28, and the high-pressure oil pump 29 on the upper surface, respectively, the base 17 which is detachably provided, is formed in a rectangular parallelepiped shape and is hollow. The inside of the hollow base 17 is partitioned into a plurality of chambers 30a and 30b.

Then, in the one chamber 30a, the first hydraulic cylinder 21,
The hydraulic oil for operating the second hydraulic cylinder and the clamp cylinder 22 is stored, and the coolant is stored in the other chamber 30b.

In FIGS. 1 and 2, reference numeral 35 is a motor for revolving the rolling die, and 36 is a hydraulic switching valve for switching the supply and discharge of pressure oil to and from each cylinder.

With the metal pipe end processing machine of the present invention configured as described above, a drawing die is pressed against the end of the metal pipe to taper the end of the metal pipe, or the metal pipe. The operation itself when forming a male screw by rolling on the outer peripheral surface of the tip end portion of is the same as that of the conventional metal pipe end processing machine described above.

That is, when performing a drawing process for forming the tip of the metal pipe in a tapered manner, the metal pipe to be drawn is inserted into the through hole 31 of the clamp mechanism 20 constituting the drawing machine 18, and the clamp is formed. By supplying pressure oil to the clamp cylinder 22 that constitutes the mechanism 20 and moving the rod 23 to the left, the clamp case
Clamping die 38 through taper cam 37 built in 32
And the clamp die 38 holds down the metal pipe. In this way, since the force of the clamp die 38 to hold down the metal pipe is increased by the taper cam 37, the pressure oil source of the clamp cylinder 22 and the first hydraulic cylinder 21 to be described below are used.
It is possible to securely fix the metal pipe without using the pressure oil source as a common source and without particularly increasing the diameter of the clamp cylinder 22.

After the metal pipe is fixed by the clamp mechanism 20 as described above, the drawing die having the tapered hole is then attached to the metal pipe by the first hydraulic cylinder 21 arranged coaxially with the through hole 31. By pressing it toward the tip, the tip of the metal tube is tapered to a shape along the inner peripheral surface of the tapered hole provided in the drawing die. At this time, since the metal pipe is securely fixed by the clamp mechanism 20, the metal pipe does not move.

As mentioned above, the metal pipe with the tapered tip is
After being pulled out from the through hole 31 of the clamp mechanism 20, the through hole 34 provided in the supporting tool 33 attached to the rolling machine 19 provided underneath.
Through, and is inserted into the casing 27 of the rolling machine 19.

A plurality of rolling dies are pressed by the second hydraulic cylinders on the outer peripheral surface of the distal end portion of the metal tube inserted in the casing 27 in this manner. The metal tube is rotated around the metal tube via a belt, and a male screw is formed by rolling on the outer peripheral surface of the end portion between the metal tubes. At the time of this rolling process, the coolant (cooling oil) sucked from the chamber 30b by the low-pressure oil pump 28 is poured onto the outer peripheral surface of the end of the metal tube, and the temperature rise due to the process is suppressed.

In the case of the metal pipe end processing machine of the present invention configured and operating as described above, the drawing machine 18, which is a plastic working machine, and the rolling machine
19, high-pressure oil pump for supplying pressure oil to each processing machine 18, 19
29, a motor 35 for rotating the rolling die, a low pressure oil pump 28 for supplying coolant, etc. are provided on the upper surface of the hollow base 17, and the first hydraulic cylinder 21 and the second hydraulic cylinder Since a single high-pressure oil pump 29 is used to send hydraulic oil to the clamp cylinder 22 and the clamp cylinder 22, it is possible to reduce the size of the processing machine as a whole. Will be easier.

In addition, in the case of the present invention, since it is possible to downsize the entire processing machine, it is effective not only when applied to a disassembled and assembled processing machine, but also when applied to a stationary processing machine. .

(Effect of the Invention) Since the metal pipe end processing machine of the present invention is configured and operates as described above, the processing machine can be downsized and the metal pipe end processing machine can be used. The range can be expanded.

[Brief description of drawings]

1 to 4 show an embodiment of a metal pipe end processing machine according to the present invention. FIG. 1 is a side view, FIG. 2 is a view seen from the left side of FIG. 1, and FIG. 1 is an enlarged side view showing only the upper part of FIG. 1, FIG. 4 is an enlarged vertical side view showing the left half of FIG. 3, and FIGS. 5-6 are conventional metal pipe end processing machines. FIG. 5 is a side view, and FIG. 6 is a view seen from the left side of FIG. 1: base, 2: plastic working machine, 3: rolling machine, 4: clamping device, 5: through hole, 6, 7: hydraulic cylinder, 8: through hole, 9: casing, 10, 11: tank, 12, 13: pressure oil pump, 14: hydraulic switching valve, 15: motor, 16: caster, 17: base, 18: drawing machine, 19: rolling machine, 20: clamp mechanism, 21: first Hydraulic cylinder, 22: Clamp cylinder, 23: Rod, 24: Connecting rod, 25a, 25b: Support plate, 26: Push rod, 27: Casing, 28: Low pressure oil pump, 29: High pressure oil pump, 30a, 30b:
Chamber, 31: through hole, 32: clamp case, 33: support tool, 34: through hole, 35: motor, 36: hydraulic switching valve, 37: taper cam, 38: clamp die, 39: inclined surface, 40: pressing piece , 41: Guide plate.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A clamp mechanism for displacing a clamp die as the pressure oil is fed into the clamp cylinder to hold down a metal pipe to be machined, and a machining die at the tip of the metal pipe fixed by the clamp mechanism. By pressing a rolling die onto the outer peripheral surface of the metal pipe tip with a second hydraulic cylinder, the outer peripheral surface of the metal pipe is plastically machined by a second hydraulic cylinder. In a metal pipe end processing machine combined with a rolling processing machine, the clamp cylinder, the first hydraulic cylinder and the second hydraulic cylinder have the same supply source of pressure oil, and the clamp cylinder has the same structure. A metal pipe end processing machine characterized in that a booster mechanism by a taper cam is provided between the clamp die and the clamp die.