JP2891035B2 - Pipe end finishing equipment - Google Patents

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.
More specifically, it is used to finish the end face of a drawing tube.
It relates to the pipe end finishing device.

[0002]

2. Description of the Related Art Generally, when a pipe is cut, a tongue-like projection called a flash is formed on an end face thereof. 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, large projections are formed on the end face of a hot-cut tube such as an extruded tube used for a drawing tube, as compared with a cold-cut tube. And
Even for such a large projection, the same end face polishing with a rotary brush and chamfering with a cutter as in the case of the cold cut surface are applied.

[0003] The end surface polishing with a rotating brush is disclosed in, for example, Japanese Patent Publication No. 51-14196 and Japanese Patent Publication No. 59-4330.
No. 7 discloses this. As shown in FIG. 2 (A), the end surface polishing disclosed herein involves, as shown in FIG. 2 (A), a rotating brush 7 in which bristles such as wires are implanted around a rotating shaft 8 perpendicular to the axis of a pipe P as a workpiece. Used. If the rotating brush 7 is brought into contact with the end face of the pipe P while rotating, a projection called a flash generated on the end face of the pipe P is removed.

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

[0005]

The polishing of the end face with a rotary brush and the chamfering with a cutter are also basically effective for removing protrusions formed on the end face of a pipe cut by hot. However, since the protrusions are large, it takes a long time to remove the edge by polishing with a rotating brush. Used for drawing pipe
In the manufacture of extruded tubes, tubes may be manufactured one after another, and the time allowed for removal of protrusions on the end surface may be about 10 seconds. It is impossible to remove the large protrusions to such a level that there is no problem within such a short time by the end face polishing by the rotating brush. Therefore, it is difficult to automate the operation by brush polishing.

On the other hand, chamfering with a cutter can remove large projections in a short time, which is convenient for automation of work.
However, a large impact force is applied to the large projection, so that the cutter is frequently broken, which increases the cost required for the cutter. Also, as can be seen in extruded tubes, many of the tubes that are cut hot are notably uneven in wall thickness.For example, when the tube is supported on the outer surface, the center of the inner surface is eccentric to the head, and the inner surface side When the edge is chamfered, the impact force due to the eccentricity also acts on the cutter. Therefore, the cost associated with the breakage of the cutter is further increased.

[0007] An object of the present invention is to provide an end face of a drawing tube.
Jill remove large protrusions in a short time by a cutter, moreover, it is to provide a tube end finishing device can be greatly suppressed compared with the conventional breakage of the cutter.

[0008]

According to the present invention, there is provided a pipe end finishing apparatus in which a tip of a rotating shaft which moves in an axial direction can be tilted in all directions around the axis of the rotating shaft, and a rotary shaft is provided. A pivoting rotary head elastically held concentrically with the axis of the shaft is connected, and the outer peripheral surface of the rotary head is formed into a tapered surface whose outer diameter gradually decreases toward the distal end side. A chamfering machine in which a plurality of cutters extending in a direction intersecting the circumferential direction at three or more circumferential positions are arranged at equal intervals, and an inner surface by the chamfering machine
Both inner and outer edges prior to side edge grinding
Beside the chamfering machine to grind the chamfering machine
Many bristles are planted around the axis of rotation perpendicular to the axis of rotation
Can be moved in the axial direction of the rotating shaft of the chamfering machine.
And moveable in the direction perpendicular to the axis.
And an end face polishing machine .

[0009]

[0010]

The pipe end finishing apparatus according to the present invention includes a chamfering machine having a swing type rotary head. Since the outer peripheral surface of the rotary head is a tapered surface, it is inserted into a tube, and is advanced in the axial direction of the rotary shaft while rotating the rotary head, so that the inner surface of the end surface is formed by the cutter provided on the tapered surface. The side edge is cut to remove any beam that has formed at that edge.

[0011]

Moreover , 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. Also, even when the inner or outer surface of the pipe is eccentric with respect to the rotation axis due to the uneven thickness of the pipe, the tapered surface follows the eccentric inner or outer surface due to the swing of the rotating head, and the impact force applied to the plurality of cutters Are equalized. Therefore, breakage of the cutter is suppressed.

In addition to the above, the pipe end finishing apparatus of the present invention includes an end face polishing machine having a rotating brush on the side of the chamfering machine. The end face is roughly polished with the rotating brush of the polishing machine, and the protrusions present on the outer side edge and the inner side edge of the end face are reduced, so that the load on the cutter in the chamfering machine can be further reduced. In addition, since the rotating brush can move in a direction perpendicular to the axis of the rotating shaft of the chamfering machine, the inner edge and the outer edge of the end face are evenly polished by the movement.

By the way, the edge of the pipe end is generally
In many cases, high chamfering accuracy is required for either one of the inner side and the outer side . Pipe end finishing device of the present invention
In the case of a drawing tube targeted for , a high chamfering accuracy is required for an inner edge into which a plug is inserted. Therefore, it is necessary to completely remove the burrs generated on the inner edge, but some burrs generated on the outer edge may remain. Therefore, when combined with a rotary brush, chamfering machine may be provided only to the edge of the inner surface Nodea
You .

Since the rough polishing by the rotating brush does not completely remove the projections, it can be performed in a short time, and in consideration of the reduction of the load on the chamfering machine, the time required for the pipe end finishing can be reduced by using only the chamfering machine. no great difference between, pull-out
While ensuring a substantial quality of Yomotokan finish time will be greatly shortened.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a plan view showing the entire structure of an example of a pipe end finishing device embodying the present invention, and FIG.
FIG. 5 is a side view of the end face polishing machine as viewed in the direction of the arrow, FIG. 5 is a side view of the chamfering machine as viewed in the direction of the arrow YY in FIG. 3, and FIG. 7 is a front view of the rotary head, and FIG. 8 is a vertical sectional side view of the rotary head.

As shown in FIG. 3, the pipe end finishing apparatus includes one end grinding machine A and one chamfering machine B which are juxtaposed in a direction perpendicular to a conveying line of a pipe P as a workpiece. Consists of

The pipe P is an extruded pipe for a drawn raw pipe, and the pipe P is fed longitudinally through a conveying line with the end face on the side not subjected to the drawing process at the head, and enters the pipe end finishing device. The pipe P is stopped with the pipe ends aligned by a pipe end stopper 2 driven by a motor cylinder. Then, it is fed laterally to the first processing position p1, where the end face is processed by the end face polishing machine A, and then fed sideways to the second processing position p2, where the end face is reworked by the chamfering machine B. .

The end face polishing machine A has a lifting table 3 as shown in FIGS. The lifting table 3 is supported by four vertical rods 4 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.
Is driven up and down. 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 backward.

On the front upper surface of the slide table 6, a rotary brush 7 is attached. The rotating brush 7 is obtained by implanting bristles such as a steel stranded wire around a horizontal rotating shaft 8. The rotating shaft 8 of the rotating brush 7 is horizontally supported by a pair of left and right bearings 9 and 9 on the slide table 6 so that the axis of the rotating shaft 8 is orthogonal to the conveying line of the pipe P. The motor 10 mounted on the rear upper surface of the slide table 6 is used as a power source, and the belt 11 is driven to rotate using a power transmission mechanism.

The pipe P transported to the first processing position p1 is
The center direction is orthogonal to the axis of the rotating shaft 8 of the rotating brush 7, and the rotating brush 7 stops at the front of the rotating 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 is
Four rods 1 in the same manner as the lifting table 3 of the end face polishing machine A
2 and is driven up and down by a motor jack 13. A slide table 17 that moves forward and backward using a motor 16 as a power source is provided on the lifting table 15 similarly to the end surface polishing machine A.

A rotary shaft 18 is mounted on the upper surface of one side of the slide table 17. The rotary shaft 18 is a spindle supported by bearings 18a with its axis parallel to the conveying line of the pipe P, and 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. It is driven to rotate. A rotating head 21 that holds a plurality of cutters is connected to the tip of the rotating shaft 18.

As shown in FIG. 6, a center set bolt 23 is attached to the tip of the head bracket 22 as shown in FIG.
It is attached concentrically using. The rear part of the head bracket 22 is shaped like a sleeve, and is externally fitted to the foremost part of the rotating shaft 18 at an interval, and a self-aligning roller bearing 24 is provided between the two. The bearing 24 causes the center of the head bracket 22 to incline in all directions around the axis of the rotating shaft 18 to swing the rotating head 21 around the axis.

On the other hand, a sleeve-shaped spindle head 25 is externally fitted to the tip of the rotating shaft 18. The rear part of the spindle head 25 is non-rotatably connected to the rotating shaft 18 by a key 26. The front of the spindle head 25
The head bracket 22 is externally fitted to a sleeve-shaped rear portion. An internal gear 27 is provided on a front inner surface of the spindle head 25. The internal gear 27 meshes with an external gear 28 provided on the rear outer surface of the head bracket 22. Therefore, the rotation of the rotation shaft 18 is
Is 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 facing the outer surface, a compression spring 29 formed by stacking disc springs is interposed. The compression springs 29 are equally spaced around the axis of the rotary shaft 18 and
2 is elastically supported concentrically with respect to the rotating shaft 18.

FIGS. 7 and 8 show the rotary head 21.
As shown in the figure, a cone-shaped one having a tapered surface 30 whose outer peripheral surface is gradually reduced in diameter toward the front end is used. Cutters 31 for chamfering are screwed at equal intervals of 60 ° at six positions in the circumferential direction of the tapered surface 30. The cutter 31 extends along the slope of the tapered surface 30 and has a length that is approximately half the length of the tapered surface 30 in the inclined direction. At three positions separated by 120 °, two cutters 31, 31 are cascaded, and at the other three positions, the cutters 31, 3 are arranged.
In order to cover one gap, one cutter 31 is attached to the center of the tapered surface 30 in the inclined direction.

The reason why the cutter 31 is subdivided in this way is to reduce the size of the cutter 31 and to reduce 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 at 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 rotating 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 are at the same height. Then, with the slide tables 6 and 17 on the elevating tables 3 and 15 at the rear end, 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 vertically.

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

Since the end surface polishing by the rotating brush 7 is not intended to completely remove the protrusions on the end surface, the end surface is rounded up in a short time. During polishing, the tube P is fixed in the axial direction or rotated in the circumferential direction as required.

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

When the fixing of the pipe P is completed, the slide table 17 moves forward while rotating the rotary head 21. Thereby, 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 edge of the end surface. Even after the cutter 31 hits the edge, the slide table 17 continues to advance until a predetermined cutting depth is obtained, whereby the edge is ground and the burrs remaining on the edge are 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 of the cutters 31 is small. The rotating head 21
Is elastically concentrically held at the tip of the rotating shaft 18,
Even when the center of the inner surface does not coincide with the axis of the rotating shaft 18 due to uneven thickness in the circumferential direction of the tube P, the center of the rotating head 21 is rotated by pushing the rotating head 21 into the tube P. All cutters 3 inclined to the center and in the circumferential direction
1 corresponds to the edge. Therefore, the impact force applied to the cutter 31 is equalized. Furthermore, the protrusion on the end face is
By having been reduced in advance by rough polishing,
The impact force applied to the cutter 31 is reduced. Therefore, breakage of the cutter 31 is greatly suppressed.

Further, the chamfering time is also remarkably reduced, and the processing time is greatly reduced in comparison with the complete removal using only the rotating brush 7, even when the time for the rough polishing by the rotating brush 7 is combined.

It is sufficient that only the inner edge through which the plug passes is completely polished in the pipe P made of the extruded pipe for the drawn element pipe, and there is no particular problem that a slight burr remains on the outer edge. Therefore, the end face finishing is completed by the processing by the rotating brush 7 and the cutter 31.

[0039]

Particularly desirable positions of the cutter 31 in the circumferential direction are four to six.

[0041]

As described above, the pipe end finishing apparatus according to the present invention is characterized in that the extruded pipe is formed by oscillating the rotary head and arranging the cutters at three or more circumferential positions on the circumferential surface thereof. Of the end face of the drawing tube obtained by hot cutting
Even large projections formed on the inner surface side are removed in a short time, and the cost of the cutter is reduced by suppressing breakage of the cutter.

In addition , before the chamfering on the inner side by the cutter , the projections on the inner side and the outer side are rough-polished by a rotating brush.
By reducing the size, the loss of the cutter in the chamfering on the inner surface side is further reduced, and the effect of reducing the cost of the cutter is further enhanced. Furthermore, the protrusion on the inner surface through which the plug passes
Can be reliably removed by chamfering.
Can be substantially reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a protrusion generated on an end face of a tube cut by hot.

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

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

FIG. 4 is a side view of the end face polishing machine taken along the line XX of FIG. 3;

FIG. 5 is a side view of the chamfering machine taken along line YY of FIG. 3;

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

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

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

[Explanation of symbols]

 Reference Signs List A end surface polishing machine B chamfering machine P pipe 3,15 lifting table 6,17 slide table 7 rotating brush 8,18 rotating shaft 10,19 motor 21 rotating head 24 self-aligning roller bearing 30 taper surface 31 cutter

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int. Cl. ⁶ , DB name) B23P 23/02 B23C 3/12 B23D 79/00 B24B 9/00 602 B24B 29/00

Claims (1)

(57) [Claims] An inner edge of a pipe end face of a drawing pipe and a pipe.
End finishing equipment to remove burrs generated on the outer and outer edges
A is, neck to the tip of the rotary shaft moves in the axial direction, is tiltable in all directions around the axial center of the rotating shaft, it has been and elastically held in concentric relative to the axis of the rotary shaft connecting the swing type rotary head, outside toward the distal end side outer peripheral surface of the rotary head
A chamfering machine in which a plurality of cutters extending in a direction intersecting with the circumferential direction at three or more circumferential positions of the tapered surface are formed at regular intervals and a tapered surface having a tapered surface whose diameter gradually decreases , and prior to edge grinding on the inner surface side by the chamfering machine Inside
And the side of the chamfer to grind both outer edges
Around the axis of rotation that is perpendicular to the axis of rotation of the chamfering machine
A rotating brush with a large number of bristles implanted is rotated by a chamfering machine.
It can be moved in the direction of the axis of the shaft, and at a right angle to the axis.
An end surface polishing machine capable of moving in any direction .