JPH0760334A - Production device of tube with internal groove - Google Patents

Abstract

PURPOSE:To provide a production device of a tube with internal grooves which has an excellent radiating property, an excellent durability even when grooving is highly speedily made and a stable quality. CONSTITUTION:The device has a grooving plug 7 having grooving parts corresponding to the internal groove on its outer circumference, plural pressing rolls 12 having grooves on its outer circumference and revolves while rotating on the circular locus of the same center to the tube to be worked, and plural spherical bodies 4 fitting into the groove and pressing the outer circumference of the part to be worked of the tube to be worked by revolving on the outer circumference while rotating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner surface grooved pipe manufacturing apparatus, and in particular, by processing the inner surface while pressing the outer periphery of the pipe to be processed in a point shape, the processing speed, processing accuracy and durability of the device are improved. To an inner grooved pipe manufacturing apparatus having improved inner surface.

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional inner surface grooved pipe manufacturing apparatus has a rotary head 2 which rotates the outer circumference of a pipe 1 to be processed in a circumferential direction, and a presser provided inside the rotary head 2. A pressing portion having a ring 3 and a plurality of balls 4 which are supported at two points by the pressing ring 3 and are pressed against the outer surface of the pipe 1 to be processed is provided, and the pressing portion pulls out the pipe 1 to be processed. It is provided between 5 and the extraction part 6.

Inside the pipe 1 to be processed, a spiral projection 7a is formed on the outer peripheral portion, and the grooved plug 7 is located at the pressing portion of the ball 4 and inscribes therein, and the pipe 1 to be processed in the drawing portion 5. The floating plug 8 located in contact with the inner wall of the is connected by a tie rod 9 and is rotatably supported.

According to the inner grooved pipe manufacturing apparatus described above, the outer diameter of the pipe 1 to be processed is reduced by being pulled out by the pulling portion 5. At this time, the outer periphery of the floating plug 8 located inside the pipe is in contact with the inner wall of the pipe 1 to be processed.

The diameter-reduced pipe 1 to be processed moves in the drawing direction and is fed into the rotary head 2. The balls 4 provided inside the rotary head 2 and supported at two points by the pressing ring 3 are in point contact with the outer periphery of the pipe 1 to be processed,
By the rotation of the rotary head 2 in the direction shown by the arrow, the ball 4 rotates in the same direction as this rotating direction, and presses the outer periphery of the pipe 1 to be processed.

By the pressing by the balls 4, the inner wall of the pipe 1 to be processed is pressed against the grooving plug 7 having the spiral projection 7a formed on the outer peripheral portion. The grooving plug 7 pressed against the inner wall rotates with the movement of the pipe 1 to be processed to form an inner grooved pipe 11 having a spiral continuous groove 10. This inner grooved tube 11
Is further drawn at a drawing portion 6 provided in the drawing direction to be molded into a predetermined outer diameter.

[0007]

However, in the conventional inner grooved tube manufacturing apparatus, since the inner and outer peripheral velocities of the ball are largely different, slipping occurs between the inner ring and the inner ring and the ball is easily worn. Also, since the ball that presses the pipe to be processed is provided inside the rotary head, the heat dissipation of frictional heat due to the sliding of the ball when pressing the pipe to be processed is poor, and the ball and the pressing ring must be cooled sufficiently. I can't. Therefore, in addition to the causes described above, the wear of the balls and the pressing ring is remarkable and the life of the parts is short. In addition, adjustment of the pressing amount of the pipe to be processed requires measures such as replacement of the pressing ring that supports the ball at two points or insertion of a spacer between the pressing rings, but this can be easily performed. Therefore, there is a problem that the pressing amount cannot be continuously changed during processing. Therefore, an object of the present invention is to produce an inner grooved pipe having excellent heat dissipation, easy continuous adjustment of the pressing amount, good durability even if the grooving process is speeded up, and stable quality. An object of the present invention is to provide an inner grooved tube manufacturing apparatus capable of manufacturing the inner grooved tube.

[0008]

The present invention is excellent in heat dissipation,
In order to manufacture an inner grooved pipe with good durability and stable quality even if the grooving speed is increased, a grooving plug that has a grooving portion corresponding to the inner surface groove on the outer circumference and an outer circumference A plurality of pressure rolls that have a groove on their axis and revolve on a circular locus concentric with the pipe to be processed, and engage with the above-mentioned grooves to revolve while rotating around the outer periphery of the processed part of the pipe to be processed. An inner grooved tube manufacturing apparatus having a plurality of spheres pressed by the above.

According to the present invention, in addition to the above-mentioned structure, a pressing roll mounting shaft fixing portion supported so as to be fixed by being rotated by a predetermined angle on a rotary head for revolving the pressing roll on a circular locus, and a pressing roll. (EN) Provided is an inner grooved pipe manufacturing apparatus having a pressure roll support shaft having a pressure roll mounting shaft provided with a central shaft of a pressure roll at a position eccentric to the central shaft of a mounting shaft fixing portion.

[0010]

According to the inner grooved pipe manufacturing apparatus of the present invention, when a plurality of spheres are fitted and rotated on a pressing roll having a groove on the outer periphery when the pipe to be processed is pressed, slips between them are prevented. To be done. This slip amount can be adjusted by adjusting the pressing roll supporting means, and since the frictional heat generated by the slip is radiated from the plurality of spheres held by the pressing roll, the durability of the sphere and the pressing roll is improved. Improving and stabilizing the quality of the inner grooved pipe to be processed.

[0011]

[Embodiment 1] Hereinafter, an inner grooved pipe manufacturing apparatus of the present invention will be described in detail with reference to the drawings. Portions having the same configurations and functions as those in FIG. 7 are designated by the same reference numerals and reference numerals, and thus duplicated description will be omitted.

FIG. 1 shows an embodiment of the inner grooved pipe manufacturing apparatus of the present invention, in which a processing ball 4 is in contact with the outer periphery of a pipe 1 to be processed in which a groove cutting plug 7 is located. A body portion 12A of a backup roll 12 rotatably supported by the rotary head 2 is in contact with the outer periphery of the processing ball 4.

The body portion 12A is a backup roll 12
Has a V-shape in which the outer diameter of the central portion is reduced with respect to the outer diameters of both edges in the thickness direction, and is held in the central axis direction of the pipe 1 to be processed by being in contact with the processing ball 4 at two points. .

FIG. 2 shows the rotary head 2, the processing ball 4, and the backup roll 12 in the direction of the pull-out portion 5, that is,
The figure seen from the sending direction of the pipe to be processed is shown. The backup roll 12 is, for example, a rotary head 2 using a shaft 12B equipped with a chuck mechanism used in a lathe or the like.
It is rotatably fixed to the pipe 1 and can be moved individually or at the same time in the radial direction of the pipe 1 to be processed depending on the processing conditions.

The shaft 12B is arranged at a position symmetrical with respect to the central axis of the pipe 1 to be processed.
The backup rolls 12 provided in each press the two processed balls 4 against the pipe 1 to be processed.

The processing balls 4 are arranged symmetrically with respect to the central axis of the pipe 1 to be processed by being supported by two backup rolls 12, respectively, and are in contact with the pipe 1 to be processed.

The operation of the inner grooved tube manufacturing apparatus of the present invention will be described below.

The pipe 1 to be processed has its outer diameter reduced by being pulled out by the pulling portion 5. At this time, the floating plug 8 located inside the pipe and defining the inner diameter contacts the inner wall of the pipe 1 to be processed.

Thereafter, the diameter-reduced pipe 1 to be processed moves in the drawing direction, and when passing through the rotary head 2, the processed ball 4
Is pressed by the direction perpendicular to the axial direction.

At this time, when the rotary head 2 rotates in the direction A (clockwise) shown in the figure, the processing ball 4 in contact with the pipe 1 to be processed rotates in the direction C (clockwise) to back up. By rotating the roll 12 in the direction B (counterclockwise), the inner wall is pressed against the spiral projection 7a of the grooved plug 7 inserted into the tube.

By pulling out the pipe 1 to be processed while the projection 7a is being pressed, the groove cutting plug 7
Is rotated, an inner grooved pipe 11 having a continuous groove 10 is formed, and the pipe is pulled out at a pulling portion 8 provided in the pulling direction, so that the diameter is reduced to a predetermined outer diameter.

Dissipation of frictional heat due to sliding during pressing is
Since it is mainly performed by the processing ball 4 and the backup roll 12, the wear of these parts is prevented.

FIG. 3 shows another embodiment of the present invention, in which the shaft 13 for fixing the backup roll 12 to the rotary head 2 has a structure capable of being displaced in the radial direction of the pipe 1 to be processed.
This backup roll 12 is a body portion 12 with the sphere 4.
A is formed with the same curvature as the sphere.

FIG. 4 shows a front view of the shaft 13, and FIG. 5 shows a side view. Backup roll fixing unit 1 for rotatably fixing a backup roll 12 (not shown)
The center axis O ′ of 3A is offset from the center axis O of the rotary head fixing portion 13B, and has an eccentric amount of A.

The rotary head fixing portion 13B is the rotary head 2
With respect to the backup roll 1 based on the eccentricity amount A, it can be fixed after setting a predetermined rotation angle.
2 (central axis O ') orbit of the rotary head fixed part 13B
It can be adjusted to the inside or outside of the revolution trajectory of the central axis O of, or to coincide with it.

FIG. 6 is a sectional view taken along line AA of FIG. In the figure, the grooving plug 7 and the tie rod 9 located in the pipe 1 to be processed are omitted. Each backup roll 1 provided in the outer peripheral direction of the pipe 1 to be processed
2 is in contact with the processing ball 4 in a direction away from the central axis of the pipe 1 to be processed, that is, in a state where the radius of rotation with respect to the pipe 1 to be processed is the largest and the pressing amount is the smallest.

In this embodiment, if all the rotary head fixing portions 13B are configured to be interlockable by using, for example, gears, all the other rotary heads can be adjusted only by arbitrarily adjusting the rotary head fixing portions 13B. Since the fixed portion 13B can be simultaneously rotated by the same amount, the backup roll 1
The revolution radius of 2 can be changed according to the diameter of the pipe to be processed or the change in the pressing amount.

This makes it possible to finely adjust the pressing amount of the processing ball 4 according to the processing state without stopping the operation of the inner grooved tube manufacturing apparatus or replacing the parts.

[0029]

As described above, according to the inner grooved pipe manufacturing apparatus of the present invention, a plurality of spheres are fitted to the pressing roll having the groove on the outer periphery to rotate when the pipe to be processed is pressed. It has excellent heat dissipation, it is easy to continuously adjust the pressing amount, and it has good durability even if the grooving process becomes faster.
An inner grooved tube of stable quality can be manufactured.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of an inner grooved tube manufacturing apparatus of the present invention.

FIG. 2 is an explanatory view showing the arrangement of backup rolls and processing balls of the inner grooved pipe manufacturing apparatus of the present invention.

FIG. 3 is an explanatory view showing another embodiment of the inner grooved tube manufacturing apparatus of the present invention.

FIG. 4 is a front view of a shaft 13 in another embodiment of the inner grooved tube manufacturing apparatus of the present invention.

FIG. 5 is a side view of a shaft 13 in another embodiment of the inner grooved tube manufacturing apparatus of the present invention.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is an explanatory view showing a conventional inner surface grooved pipe manufacturing apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pipe to be processed 2 Rotating head 3 Pressing ring 4 Ball 5,6 Drawing part 7 Grooving plug 7a Projection 8 Floating plug 9 Tie rod 10 Groove 11 Inner grooved pipe 12 Backup roll 12A Body part 12B Shaft 13 Shaft 13A Backup roll fixed Part 13B Rotating head fixing part

Claims (2)

[Claims] 1. A grooving plug which is located in contact with an inner surface of a portion to be processed of a pipe to be processed and has a groove cutting portion on the outer periphery according to an inner surface groove; A plurality of pressing rolls located in the outer peripheral direction of the processed portion and revolving while rotating on a circular locus concentric with the processed pipe, and an outer surface of the processed portion of the processed pipe and the plurality of pressing rolls. The pipe to be processed is located in a space formed between the inner sides, and receives the rotational force by fitting into the groove to revolve while revolving on a small circular locus having a radius smaller than the circular locus. And a plurality of spheres that press the outer circumference of the processed portion of (1). 2. A grooving plug which is located in contact with an inner surface of a portion to be processed of a pipe to be processed and has a groove cutting portion corresponding to an inner surface groove on the outer periphery, and a groove on the outer periphery, and the pipe to be processed. A plurality of pressing rolls located in the outer peripheral direction of the processed portion and revolving while rotating on a circular locus concentric with the processed pipe, and an outer surface of the processed portion of the processed pipe and the plurality of pressing rolls. The pipe to be processed is located in a space formed between the inner sides, and receives the rotational force by fitting into the groove to revolve while revolving on a small circular locus having a radius smaller than the circular locus. A plurality of spheres that press the outer periphery of the processed portion, and a pressure roll mounting shaft fixing portion that is supported so as to be fixed by rotating the pressure roll on a rotary head that revolves on the circular locus by a predetermined angle, Eccentric with respect to the central axis of the pressure roll mounting shaft fixing part And a pressing roll mounting means having a pressing roll mounting shaft provided with the central axis of the pressing roll at the position, the pressing roll supporting means, when rotated by the predetermined angle with respect to the rotary head, An inner grooved tube manufacturing apparatus, wherein the central axis of the pressing roll is displaced in the radial direction based on the amount of eccentricity.