JPH06270014A - Pipe end finishing device - Google Patents

Abstract

PURPOSE:To prevent the breakage of a cutter by removing the large burrs generated on the end surface of a pipe which is thermally cut by a cutter, in a short time. CONSTITUTION:An oscillating type rotary head 21 is installed at the top of a rotary shaft 18. Cutters for chamferring the end surfaces of pipes P are arranged at an equal interval at least at three positions on the tapered peripheral surface of the rotary head 21. Before chamferring the end surface of the pipe, the end surface is roughly polished by a rotary brush 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe end finishing apparatus suitable for finishing an end face of a hot cut pipe such as an extruded pipe.

[0002]

2. Description of the Related Art Generally, when a pipe is cut, a tongue-shaped projection called a flash is formed on the end surface of the pipe. When the tube is cut cold, the protrusions are small and can be removed relatively easily by polishing the end face with a rotating brush or chamfering with a cutter. But,
As shown in FIG. 1, a large protrusion, which is not comparable to a cold-cut tube, is formed on the end face of a hot-cut tube such as an extruded tube. Then, even for such a large protrusion, end face polishing by a rotating brush and chamfering by a cutter, which are the same as those for a cold cut surface, are applied.

End face polishing with a rotating brush is performed, for example, in Japanese Patent Publication No. 51-14196 and Japanese Patent Publication No. 59-4330.
No. 7 publication. In the end surface polishing disclosed herein, as shown in FIG. 2 (A), a rotating brush 7 having bristles such as wires implanted around a rotating shaft 8 perpendicular to the axis of a pipe P which is a workpiece is used. To use. When the rotary brush 7 is rotated and brought into contact with the end surface of the pipe P, the protrusion called burrs formed on the end surface of the pipe P is removed.

On the other hand, chamfering with a cutter is shown in FIG.
As shown in FIG. 2, the end surface of the pipe P is generally chamfered by one or two cutters 31 eccentrically attached to the tip end surface of the head 32 that rotates concentrically with the pipe P. The cutter 31 moves in the radial direction of the head 32 to grind the inner edge and the outer edge of the end face. As shown in FIG. 1, burrs are generated on the inner and outer edges of the end face, so that these protrusions are removed by grinding both edges.

[0005]

The polishing of the end face with a rotating brush and the chamfering with a cutter are basically effective for removing the protrusions formed on the end face of the pipe that has been hot cut. However, since the protrusions are large, it takes time to remove the end faces by polishing with a rotating brush. In the production of extruded pipes, the pipes are produced one after another, and the time allowed for removing the projections on the end face may be about 10 seconds. It is impossible to remove large protrusions to a problem-free level within such a short time by polishing the end surface with a rotating brush. Therefore, it is difficult to automate the work by brush polishing.

On the other hand, chamfering with a cutter can remove large protrusions in a short time, which is convenient for automation of work.
However, since a large impact force is applied to the cutter with respect to a large protrusion, the cutter is frequently damaged and the cost required for the cutter increases. Also, as seen in extruded pipes, many of the pipes that are cut by heat have a marked eccentricity. For example, when the pipe is supported on the basis of the outer surface, the center of the inner surface is eccentric to the head When chamfering the edge of, the impact force due to this eccentricity is also applied to the cutter. Therefore, the expense associated with the damage of the cutter is further increased.

The object of the present invention is to remove a large projection, which may occur on the end surface of a pipe that has been hot-cut, in a short time with a cutter, and further, to prevent damage to the cutter to a greater extent than in the prior art. To provide a finishing device.

[0008]

A pipe end finishing device according to a first aspect of the present invention is configured such that a tip end of a rotary shaft that moves in the axial direction is tiltable in all circumferential directions with respect to the axial center of the rotary shaft. And a swing-type rotary head that is elastically held concentrically with respect to the axis of the rotary shaft is connected, and the outer or inner diameter of the rotary head gradually decreases toward the distal end. The chamfering machine is provided with a plurality of cutters arranged at equal intervals in three or more circumferential positions of the tapered surface, which are not tapered surfaces.

In the pipe end finishing device according to a second aspect of the present invention, the tip end of the rotary shaft that moves in the axial direction is tiltable in all circumferential directions with respect to the axial center of the rotary shaft, and the axial center of the rotary shaft. A rotating head of a swinging type elastically held concentrically with respect to the rotating head, and the outer peripheral surface or the inner peripheral surface of the rotating head is a tapered surface whose outer diameter or inner diameter gradually decreases or gradually increases toward the tip side, A chamfering machine in which a plurality of cutters extending in a direction intersecting with the circumferential direction at three or more positions in the circumferential direction of the tapered surface are arranged at equal intervals, and the chamfering machine is arranged side by side and is rotated at a right angle to the rotation axis of the chamfering machine. An end face polishing machine is provided which is capable of moving a rotary brush in which a large number of bristles are planted around the shaft in a direction of an axis of a rotation shaft of a chamfering machine and also in a direction perpendicular to the axis. To do.

[0010]

A pipe end finishing apparatus according to a first aspect of the present invention includes a chamfering machine having a swing-type rotary head. If the outer peripheral surface of the rotary head is a tapered surface, insert this into the tube and move the rotary head forward in the axial direction of the rotary shaft while rotating the rotary head. The side edge is cut to remove the burrs on that edge.

When the inner peripheral surface of the rotary head is a tapered surface,
Insert the tube end into the inner surface of the taper surface and move the rotary head forward while advancing in the axial direction of the rotary shaft, and the cutter on the taper surface cuts the outer surface edge of the end surface. Then, the flash generated on the edge is removed.

In any case, since the cutters are arranged at equal intervals at three or more positions in the circumferential direction of the tapered surface, the impact force applied to the cutter is dispersed. Even if the inner or outer surface of the pipe is eccentric with respect to the rotation axis due to eccentricity of the pipe, etc., due to the swinging of the rotary head, the tapered surface follows the eccentric inner or outer surface, and the impact force applied to multiple cutters. Are equalized. Therefore, damage to the cutter is suppressed.

A pipe end finishing device according to a second aspect of the present invention comprises an end face polishing machine having a rotating brush on the side of the chamfering machine, and before the chamfering machine cuts the edge of the end face, the end face polishing machine. By roughly polishing the end surface with the rotating brush and making the projections on the end surface small, the burden on the cutter in the chamfering machine can be further reduced. Moreover, since the rotary brush can move in the direction perpendicular to the axis of the rotary shaft of the chamfering machine, the movement of the rotary brush evenly polishes the inner edge and the outer edge of the end face.

By the way, as for the edge of the pipe end, generally, one of the edges is often required to have a high chamfering accuracy. For example, when an extruded tube is used as a drawing tube, a high chamfering accuracy is required for the edge on the inner surface side into which the plug is inserted. Therefore, it is necessary to completely remove the flash generated on the inner surface side edge, but the flash generated on the outer surface side edge may remain to some extent. In such a case, if a rotary brush is also used, the chamfering machine may be provided only on either the inner surface side edge or the outer surface side edge.

Rough polishing with a rotating brush does not completely remove the protrusions, so that it takes only a short time. Considering the reduction of the load on the chamfering machine, the time required for pipe end finishing is only when using the chamfering machine. If the chamfering machine is provided only on one of the inner surface side and the outer surface side, the time is significantly reduced.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a plan view showing the overall structure of an example of a pipe end finishing apparatus embodying the present invention, and FIG. 4 is a line XX of FIG.
FIG. 5 is a side view of the end surface polishing machine in the view of the arrow, FIG. 5 is a side view of the chamfering machine in the view of the line YY in FIG. 3, and FIG. 6 is a vertical cross-sectional view showing the support structure of the rotary head of the chamfering machine. 7 is a front view of the rotary head, and FIG. 8 is a vertical side view of the rotary head.

As shown in FIG. 3, the pipe end finishing apparatus includes one end surface polishing machine A and one chamfering machine B, which are arranged in parallel in a direction perpendicular to the conveying line of the pipe P as a work material. Consists of.

The pipe P is an extruded pipe for drawing a raw pipe, and is fed longitudinally through the conveying line with the end face on the side not being subjected to the mouth-drawing as the leading end to enter the pipe end finishing device. The pipe P is stopped by aligning the pipe ends by a pipe end stopper 2 driven by a motor cylinder. Then, it is laterally fed to the first processing position p1, where the end surface is machined by the end surface polishing machine A, and then it is laterally fed to the second processing position p2 and the end surface is remachined by the chamfering machine B. .

The end surface polishing machine A has an elevating table 3 as shown in FIGS. The lifting table 3 is supported by four vertical rods 4 which are movable in the axial direction so as to be able to move up and down, and a motor jack 5 provided between the four rods 4.
It is driven up and down by. A slide table 6 is provided on the elevating table 3 so as to be movable in a direction parallel to the transport line of the pipe P. Slide table 6
Moves forward using the motor 1 attached to the rear surface of the lifting table 3 as a power source, and returns to the rear.

A rotating brush 7 is attached to the front upper surface of the slide table 6. The rotating brush 7 is formed by implanting bristles such as a steel twist wire around a horizontal rotating shaft 8. The rotary shaft 8 of the rotary brush 7 is horizontally supported by a pair of left and right bearings 9, 9 on the slide table 6 with its axis perpendicular to the transport line of the pipe P. Then, the motor 10 mounted on the upper surface of the rear portion of the slide table 6 is used as a power source, and the belt 11 is rotationally driven as a power transmission mechanism.

The pipe P transported to the first processing position p1 is
The central direction is made orthogonal to the axial direction of the rotary shaft 8 of the rotary brush 7, and it stands still in front of the rotary brush 7. The effective length of the rotating brush 7 is larger than the outer diameter of the pipe P.

The chamfering machine B has a lifting table 15 as shown in FIGS. The lifting table 15
Four rods 1 as well as the lifting table 3 of the end face polishing machine A
It is supported so as to be able to move up and down by 2, and is driven up and down by a motor jack 13. On the lifting table 15, a slide table 17 that moves forward and backward using a motor 16 as a power source is provided similarly to the end surface polishing machine A.

A rotary shaft 18 is attached to the upper surface of one side of the slide table 17. The rotary shaft 18 is a spindle supported by a bearing 18a with its axis parallel to the conveying line of the pipe P, and has a motor 19 mounted on the upper surface of the other end of the slide table 17 as a power source and a belt 20 as a power transmission mechanism. Is driven to rotate. A rotary head 21 holding a plurality of cutters is connected to the tip of the rotary shaft 18.

The rotary head 21, as shown in FIG. 6, has a center set bolt 23 at the tip of the head bracket 22.
Are mounted concentrically with. The rear portion of the head bracket 22 has a sleeve shape, and is externally fitted to the tip end portion of the rotary shaft 18 with a space, and a self-aligning roller bearing 24 is provided between them. Due to this bearing 24, the center of the head bracket 22 is inclined in all the circumferential directions with respect to the axis of the rotary shaft 18, and the rotary head 21 is swung with respect to the axis.

On the other hand, a sleeve-shaped spindle head 25 is externally fitted on the tip of the rotary shaft 18. The rear portion of the spindle head 25 is non-rotatably connected to the rotary shaft 18 by a key 26. The front part of the spindle head 25 is
The head bracket 22 is fitted onto the sleeve-shaped rear portion of the head bracket 22. An internal gear 27 is provided on the inner surface of the front portion of the spindle head 25. The internal gear 27 meshes with an external gear 28 provided on the outer surface of the rear portion of the head bracket 22. Therefore, the rotation of the rotary shaft 18 causes the rotation of the head bracket 22.
Be transmitted to. The external gear 28 is curved in an arc shape so as not to hinder the inclination of the head bracket 22.

On the other hand, between the rear surface of the outer peripheral portion of the head bracket 22 and the front end surface of the spindle head 25 which faces the outer peripheral portion of the head bracket 22, a compression spring 29 formed by stacking disc springs is interposed. The compression springs 29 are arranged around the axis of the rotary shaft 18 at equal intervals, and
2 is elastically supported concentrically with respect to the rotating shaft 18.

The rotary head 21 is shown in FIGS.
As shown in FIG. 5, a cone-shaped outer peripheral surface is used as a tapered surface 30 whose diameter gradually decreases toward the tip. Cutters 31 for chamfering are screwed at six positions in the circumferential direction of the tapered surface 30 at equal intervals of 60 °. The cutter 31 extends along the inclination of the tapered surface 30, and the length thereof is approximately half the length of the tapered surface 30 in the inclination direction. Two cutters 31 and 31 are arranged in a row at three positions spaced by 120 °, and at the other three positions, the cutters 31 and 3 are arranged in a row.
One cutter 31 is attached to the central portion of the tapered surface 30 in the inclination direction so as to cover the gap 1.

The cutter 31 is subdivided in this way in order to reduce the size of the cutter 31 and suppress the cost required for its replacement.

The pipe P transported to the second processing position p2 is
It is located in front of the rotary head 21 and is fixed in this position by a clamp (not shown). The outer diameter of the pipe P is between the maximum outer diameter and the minimum outer diameter of the tapered surface 30 of the rotary head 21.

Next, the operation of the pipe end finishing device will be described.

First, the height of the lifting table 3 is adjusted so that the pipe P and the rotary brush 7 have the same height. Also,
The height of the lifting table 15 is adjusted so that the pipe P and the rotary head 21 have the same height. Then, with the slide tables 6 and 17 on the elevating tables 3 and 15 being limited, the pipe P is carried into the first processing position p1 with the pipe ends aligned. At this time, the burrs of the pipe P are positioned above and below.

When the pipe P is carried into the first processing position p1, the slide table 6 advances until the rotary brush 7 comes into pressure contact with the end face of the pipe P, and in this state, the rotary brush 7 is rotated and the lifting table 3 is rotated. Moves up and down. The rotary brush 7 is moved up and down by the vertical movement of the elevating table 3, and not only the inner edge of the end face but also the outer edge is polished, so that the burrs generated on these edges are reduced.

Since the end surface polishing by the rotating brush 7 is not intended to completely remove the projections on the end surface, the end surface is cut up in a short time. During polishing, the tube P is fixed axially or rotated circumferentially as required.

When the end surface polishing by the rotating brush 7 is completed,
The pipe P is conveyed to the second processing position p2 and fixed. The center of the outer surface of the fixed pipe P coincides with the centers of the rotary shaft 18 and the rotary head 21.

After fixing the pipe P, the slide table 17 advances while rotating the rotary head 21. As a result, the tapered surface 30 of the rotary head 21 is inserted into the pipe P, and the cutter 31 attached to the tapered surface 30 hits the inner surface side edge of the end surface. Even after the cutter 31 hits the edge, the slide table 17 continues to move forward until the predetermined cutting depth is obtained, so that the edge is ground and the burr remaining on the edge is completely removed.

At this time, since the cutters 31 are dispersedly arranged at six positions in the circumferential direction of the rotary head 21, the impact force applied to each cutter 31 is small. In addition, the rotary head 21
Is elastically and concentrically held at the tip of the rotary shaft 18,
Even when the center of the inner surface does not coincide with the axis of the rotary shaft 18 due to the uneven thickness of the pipe P in the circumferential direction, the center of the rotary head 21 is pushed into the pipe P so that the center of the rotary head 21 becomes the axis of the rotary shaft 18. All cutters 3 tilted to the center and in the circumferential direction
1 hits the edge. Therefore, the impact force applied to the cutter 31 is equalized. Furthermore, the protrusion on the end face is the rotating brush 7.
Because it is made smaller in advance by rough polishing with
The impact force applied to the cutter 31 is reduced. Therefore, the damage of the cutter 31 is significantly suppressed.

Further, the chamfering time is also significantly shortened, and even when the rough polishing is performed by the rotary brush 7, the processing time is significantly shortened as compared with the complete removal by the rotary brush 7 alone.

With respect to the pipe P made of the extruded pipe, only the inner surface side edge through which the plug passes needs to be completely polished, and there is no particular problem that some burrs remain on the outer surface side edge. Therefore, the end face finishing is completed by processing with the rotating brush 7 and the cutter 31.

When the edge on the outer surface side is ground, as shown in FIG. 9, the rotary head 21 having a tapered inner peripheral surface.
The edge is ground by the cutters 31 which are arranged at equal intervals at three or more positions in the circumferential direction on the inner peripheral surface thereof.

Particularly desirable positions of the cutter 31 in the circumferential direction are 4 to 6 positions.

[0041]

As described above, in the pipe end finishing device according to the first aspect of the present invention, the rotary head is of a swing type and the cutters are arranged at equal intervals at three or more positions in the circumferential direction of the peripheral surface. , For large projections that occur on the end surface of hot cut tubes such as extruded tubes, remove this in a short time,
Moreover, the damage of the cutter is suppressed and the cost is reduced.

Further, in the pipe end finishing device according to the second aspect of the present invention, by performing rough polishing by the rotating brush before chamfering by the cutter, the damage of the cutter in the chamfering is further reduced, and the cost of the cutter is reduced. Further increase.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a protrusion formed on an end surface of a tube that is hot-cut.

FIG. 2 is a schematic diagram for explaining a conventional method used for removing protrusions.

FIG. 3 is a plan view showing the overall structure of an example of a pipe end finishing apparatus embodying the present invention.

FIG. 4 is a side view of the end face polishing machine taken along the line XX in FIG.

5 is a side view of the chamfering machine taken along the line YY of FIG.

FIG. 6 is a vertical cross-sectional side view showing a support structure of a rotary head of a chamfering machine.

FIG. 7 is a front view of a rotary head.

FIG. 8 is a vertical sectional side view of the rotary head.

FIG. 9 is a cross-sectional view showing a schematic configuration of a rotary head used for chamfering on the outer surface side.

[Explanation of symbols]

 A edge polishing machine B chamfering machine P tube 3,15 lifting table 6,17 slide table 7 rotary brush 8,18 rotary shaft 10,19 motor 21 rotary head 24 self-aligning roller bearing 30 taper surface 31 cutter

Claims (2)

[Claims] 1. A tip of a rotary shaft that moves in the axial direction is tiltable in all directions around the rotary shaft and is elastically held concentrically with respect to the rotary shaft. And a swinging type rotary head are connected, and the outer peripheral surface or the inner peripheral surface of the rotary head is not a tapered surface whose outer diameter or inner diameter gradually decreases or increases toward the tip side, and the taper surface has three or more positions in the circumferential direction. A pipe end finishing device comprising a chamfering machine in which a plurality of cutters extending in a direction intersecting the circumferential direction are arranged at equal intervals. 2. A tip of a rotary shaft that moves in the axial direction is tiltable in all directions around the rotary shaft and is elastically held concentrically with respect to the rotary shaft. A swing-type rotary head is connected, and the outer peripheral surface or the inner peripheral surface of the rotary head is not a tapered surface whose outer diameter or inner diameter gradually decreases or gradually increases toward the tip side, and the taper surface is located at three or more positions in the circumferential direction. A chamfering machine in which a plurality of cutters extending in a direction intersecting with the circumferential direction are arranged at equal intervals, and a large number of bristles are planted side by side in parallel with the chamfering machine and around a rotation axis perpendicular to the rotation axis of the chamfering machine. A pipe end finishing device, comprising: an end surface polishing machine capable of moving the installed rotary brush in a direction of an axis of a rotation shaft of a chamfering machine and moving in a direction perpendicular to the axis. .