JP2666585B2 - Metal tube inner and outer surface processing 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 metal pipe inner / outer surface processing apparatus for processing an inner surface and an outer surface of a metal tube into a desired shape.

[0002]

2. Description of the Related Art For example, in a metal heat transfer tube used for a heat exchanger or the like, a spiral groove or the like is formed on an inner surface (or an outer surface) of the metal tube for the purpose of improving heat exchange efficiency. is there.

[0003] When a spiral groove or the like is formed on the inner and outer surfaces of a metal tube as described above, a method of processing the outer or inner surface of the metal tube while rotating the metal tube by using a rolling device has conventionally been adopted. This processing method has a drawback that long products cannot be processed due to the restriction of rotating the metal tube.

[0004] In order to solve this problem, a processing apparatus having a plurality of rotating bodies that revolve around the axis of the metal pipe while being pressed against the outer surface of the metal pipe has recently been developed. According to this device, a spiral groove or the like can be formed on the outer surface or the inner surface of the metal tube without rotating the metal tube, and processing of a long product is easy.

[0005]

However, in the above-mentioned processing apparatus, the frictional resistance between the tool and the metal pipe at the part where the rolling process is performed is large, and when the processing speed is increased to a certain degree, the metal pipe withstands the pulling force. There is a possibility that problems may occur such as damage due to damage to the metal pipe, abnormal vibration of the metal pipe, and reduction in processing accuracy. For this reason, there is a limit to an increase in the processing speed, and a reduction in cost is hindered accordingly.

The present invention has been made in view of the above circumstances, and when forming a spiral groove or the like on the inner surface or outer surface of a metal tube, the frictional force between the metal tube and a tool can be reduced, and the processing speed can be improved. An object of the present invention is to provide a metal pipe inner / outer surface processing apparatus.

[0007]

In order to solve the above-mentioned problems, a metal pipe inner / outer surface processing apparatus according to the present invention is provided with a diameter reducing mechanism for reducing the diameter of a metal pipe, and is disposed at a stage subsequent to the diameter reducing mechanism, and is processed by the diameter reducing apparatus. A metal tube inner and outer surface processing mechanism for further imparting a predetermined shape to the inner and outer surfaces of the metal tube, wherein the diameter reducing mechanism is inserted into the metal tube by a die pressed against the outer surface of the metal tube. A floating plug floating at a position corresponding to the die, the metal pipe inner / outer surface processing mechanism includes a plurality of rotating bodies pressed against the outer surface of the metal pipe, and these rotating bodies are respectively centered on the axis of the metal pipe. A driving mechanism for revolving; and a mandrel rotatably connected to the floating plug and floating at a position corresponding to the plurality of rotating bodies in the metal tube, wherein the driving mechanism supports the plurality of rotating bodies and simultaneously A hollow drive shaft having an insertion hole through which a metal tube is passed, a bearing mechanism that supports the drive shaft rotatably and axially displaceable, and a rotation mechanism that rotates the drive shaft axially displaceable, And a vibrating mechanism for vibrating the drive shaft in the axial direction.

The bearing mechanism includes a ferromagnetic attracted portion provided on the drive shaft, a plurality of electromagnets disposed adjacent to the outer periphery of the attracted portion, and a radial direction of the drive shaft. A magnetic levitation bearing comprising a sensor for measuring the displacement of the electromagnet and a control mechanism for controlling the amount of current to each of the electromagnets in accordance with the output signal of the sensor and keeping the axis of the drive shaft at a fixed position. There may be.

The vibrating mechanism includes a ferromagnetic attracted portion provided on the drive shaft, a plurality of electromagnets provided adjacently in the axial direction of the drive shaft of the attracted portion, and And a control mechanism for controlling the amount of current supplied to the electromagnet to vibrate the drive shaft in the axial direction.

Further, a horn mechanism for amplifying the amplitude in the axial direction may be interposed between the drive shaft and the metal pipe inner / outer surface machining mechanism. A second diameter reduction mechanism for reducing the diameter of the metal tube again, and a distance from a position where the rotating body is in contact with the metal tube to a position where the second diameter reduction mechanism is in contact with the metal tube, and The distance from the contact point of the rotating body to the contact point of the first diameter reducing mechanism may be set to an integral multiple of a half wavelength of the excitation frequency.

[0011]

According to this metal tube inner / outer surface processing apparatus, each rotating body is revolved while being pressed against the metal tube by the rotating mechanism, so that the inner surface of the metal tube is pressed against the mandrel,
The inner surface and the outer surface of the metal tube are machined by pulling out the metal tube in a subsequent stage.

Simultaneously, by vibrating each rotating body in the axial direction by the vibrating mechanism, the contact interface between the rotating body and the metal tube is relatively vibrated in a direction parallel to this interface, and the frictional resistance at this interface is greatly reduced. Can be reduced to further,
Vibration is also transmitted to the metal tube, so that the frictional resistance between the mandrel and the metal tube and the frictional resistance between the die and the metal tube can be reduced as well, reducing the overall force required to pull out the metal tube. Thus, the processing speed can be significantly improved without causing damage to the metal tube.

[0013]

1 and 2 are a structural view and a front view showing an embodiment of a metal pipe inner / outer surface machining apparatus according to the present invention. In the following description, the left side in FIG.
The right side is called the rear.

In the drawing, reference numeral 1 denotes a drive shaft having an insertion hole 1A formed along an axis, and a rotation mechanism 2 is provided at the center of the drive shaft 1.
Are provided, and a magnetic levitation type bearing (bearing mechanism) 3 is provided before and after, respectively, and further, a vibration mechanism 4 is provided in front of the bearing.

The rotating mechanism 2 comprises a rotor 5 fixed to the drive shaft 1 and a plurality of electromagnets 6 spaced apart from the outer peripheral surface of the rotor 5, similar to a normal motor. Reference numerals 6 are respectively connected to drive circuits (not shown).

On the other hand, the magnetic levitation type bearing 3 has a rotor (sucked portion) 7 made of a ferromagnetic material fixed coaxially to the drive shaft 1, and is equidistant toward the outer peripheral surface of the rotor 7 as shown in FIG. And four electromagnets 8 arranged at intervals of 90 ° in the circumferential direction. The electromagnets 8 separated from each other by 180 ° form a pair, and each pair is connected to a separate radial control circuit 9.

Four radial sensors 10 are arranged at both ends of the drive shaft 1 at equal intervals toward the outer peripheral surface of the drive shaft 1 at positions corresponding to the respective electromagnets 8 in the axial direction. I have. Of these, the pair of radial sensors 10 that are 180 ° apart from each other are connected to a radial control circuit 9 to which the electromagnets 8 corresponding thereto are connected.

Each radial control circuit 9 increases or decreases the amount of electricity to the corresponding pair of electromagnets 8 in accordance with the radial deviation of the drive shaft 1 detected by the pair of radial sensors 10.
The drive shaft 1 is attracted by the electromagnetic force, and the axial position of the drive shaft 1 is always kept constant.

The vibrating mechanism 4 includes a disk-shaped drive plate (sucked portion) 11 made of a ferromagnetic material and fixed to the drive shaft 1.
The drive plate 11 includes a pair of electromagnets 12 </ b> A and 12 </ b> B disposed opposite to each other, and these electromagnets 12 </ b> A and 12 </ b> B are connected to an axial drive circuit 13.

A disk-shaped reference plate 14 is fixed to the drive shaft 1 near the drive plate 11.
The axial sensor 1 faces the end face of the reference plate 14.
5 is provided and connected to the axial drive circuit 13.

The axial drive circuit 13 averages the output signal of the axial sensor 15 over a unit time longer than the excitation cycle (to be described later) (the time resolution may be simply reduced). If the magnitude is larger than the set reference value, the amount of power to the lower electromagnet 12B is increased, and if the value is larger than the set reference value, the amount of current to the upper electromagnet 12A is increased, thereby keeping the center of the amplitude of the drive plate 11 at a fixed position.

The axial drive circuit 13 is also connected to a high-frequency generator 16 capable of changing the transmission frequency steplessly. The high-frequency current from the high-frequency generator 16 causes a current to flow to the electromagnets 12A and 12B described above. Are modulated out of phase with each other and synchronized with the high-frequency current to drive plate 1
1 is configured to vibrate in the axial direction. The amplitude can be adjusted by increasing or decreasing the output current of the high frequency generator 16.

On the other hand, at the front end of the drive shaft 1, there is provided an inner / outer surface machining mechanism 20 for rolling a spiral groove M on the inner surface of the metal tube P. Hereinafter, FIGS. 3 and 4 will be used. The inner groove forming mechanism 20 will be described.

At the front end of the drive shaft 1, a cylindrical mounting member 2
2 is coaxially fixed by a plurality of bolts 24. A rear support frame 26, an outer ring 28, and a front support frame 30, all of which form an annular shape, are fixed to each other by a plurality of bolts 32 and 34 on the front end surface of the mounting member 22. On the other hand, it is fixed coaxially. On the inside of the rear support frame 26, an annular holding ring 36 is used.
One end of the annular thrust bearing 38 is fixed coaxially. A rear ring 40 is provided on the front end side of the thrust bearing 38.
Are fixed coaxially, and a plurality of spherical rolling balls (rotating bodies) 42 abutting on the front surface of the rear ring 40 are arranged in a ring shape.

A cemented carbide ring 28A is fixed to the inner periphery of the outer ring 28, and the rolled balls 42 are pressed from the outer periphery by the cemented carbide ring 28A. Further, an annular front ring 44 is coaxially fitted into the inner peripheral portion of the front support frame 30, and a tapered surface 44 </ b> A whose opening diameter increases toward the front is formed on the inner periphery of the front ring 44. . The rolled balls 42 are pressed from the front by the rear surface of the front ring 44.

As a result, the rolling ball 42 rolls in the circumferential direction along the outer surface of the metal tube P while compressively deforming the outer peripheral surface of the metal tube P inserted into the center holes of the rings 28A, 40, 44. It has become. At that time, the rolled ball 42
Is supported by the thrust bearing 38, so that the rear ring 40 itself rotates as the rolled ball 42 revolves.

In front of the front support frame 30, a refueling nozzle 46 is provided.
Are arranged, and the ejection direction is directed to the inside of the center hole of the front support frame 30. Further, a dice (diameter reducing mechanism) 48 is disposed in front of the refueling nozzle 46 in a direction perpendicular to the drive shaft 1, and a taper hole 48 </ b> A that expands forward is provided at a position corresponding to the axis of the drive shaft 1. Is formed. By pulling the metal pipe P backward through the tapered hole 48A, the diameter of the metal pipe P is reduced to a predetermined outer diameter.

On the other hand, inside the metal tube P, the floating plug 5
0 is inserted. This floating plug 50
As shown in FIGS. 5 and 6, the large-diameter portion 52 at the front end,
The tapered portion 54 gradually narrows rearward and the thin rod portion 56 at the rear end are formed coaxially.
Abuts on the inner surface of the metal tube P reduced in diameter by the die 48 and is always held in the die 48.

Inside the tapered portion 54, a communication hole 54A is formed from the front end surface of the large diameter portion 52 to the outer peripheral surface of the rod portion 56. Further, a groove 52A passing through the communication hole 54A is formed on the front end surface of the large diameter portion 52.

At the rear end of the rod portion 56, a cylindrical mandrel 58, a pair of magnets 62, 64, and a thrust bearing 66 are coaxially arranged in this order. It is attached to the part 56. On the outer peripheral surface of the mandrel 58, a spiral groove 60 for rolling the spiral groove M on the inner surface of the metal tube P is formed.

The magnets 62 and 64 are rare earth magnets such as Nd-Fe-B, the lines of magnetic force of which are opposite to each other, are repelled in the axial direction, and have a slight space therebetween.
Are relatively rotatable so that the load on the thrust bearing 66 is reduced.

In order to use the metal pipe inner / outer surface processing apparatus having the above-described configuration, first, the metal pipe P is disposed through the die 48, the metal pipe inner / outer surface processing mechanism 20, and the drive shaft 1, and then the rotating mechanism 2 is operated to drive the drive shaft. 1 and simultaneously vibrating mechanism 4
Is operated to ultrasonically vibrate the drive shaft 1 in the axial direction.
Further, lubricating oil is sprayed onto the metal pipe P from the oil supply nozzle 46.

When the metal tube P is pulled backward in this state,
The metal tube P is first squeezed by a die 48 and a floating plug 50 to reduce its diameter to a predetermined outer diameter. Further, the metal tube P is further compressed by a plurality of rolled balls 42 rolling on the outer periphery, and is compressed into a spiral groove 60 of a mandrel 58. The helical groove M is rolled on the inner surface by being pressed.

At this time, since each rolling ball 42 is ultrasonically vibrated in the axial direction of the drive shaft 1 by the vibration mechanism 4, the contact interface between the rolling ball 42 and the metal pipe P is parallel to this interface. Relative vibration occurs in a certain direction, and lubricating oil is effectively supplied to this interface, and the frictional resistance is greatly reduced.

Vibration is also transmitted to the metal pipe P, and the frictional resistance between the mandrel 58 and the metal pipe P and the die 48
The frictional resistance between the metal pipe P and the metal pipe P can be similarly reduced,
The force required to pull out the metal tube P can be reduced comprehensively.
Thereby, the processing speed can be remarkably improved without the risk of causing damage to the metal pipe P, and not only can the productivity be significantly increased, but also the surface roughness of the metal pipe P can be improved. is there.

Further, in this example, since the drive shaft 1 is supported by using the magnetic levitation type bearing 3, even if the drive shaft 1 is rotated at a high speed and a high load, no abrasion occurs and the life is long. Further, there is an advantage that the vibration in the axial direction by the vibration mechanism 4 is not attenuated by the bearing mechanism 3.

Further, the magnetic levitation bearing mechanisms 3, 4
According to this, since the drive shaft 1 is elastically supported in the radial direction, even if the center of revolution of each rolling ball 42 and the center of the metal tube P are slightly shifted, the drive shaft 1 Displacement is absorbed, and the deviation is absorbed. Therefore, poor rolling caused by this kind of displacement can be prevented.

Further, the rear ring 40 supporting the rolled ball 42 is rotatably supported by the thrust bearing 38, so that the rolled ball 42 revolves along the outer peripheral surface of the metal tube P. , Itself rotates. As a result, the rolling resistance of the rolled ball 42 is reduced as compared with the structure in which the rear ring 40 is fixed, the slip of the rolled ball 42 on the outer peripheral surface of the metal pipe P is prevented, and the rolling failure due to the slip is reduced. Prevention improves processing accuracy.

The lubricating oil supplied into the metal pipe P is
Since it is supplied to the mandrel 58 through the communication groove 52A and the communication hole 54A of the floating plug 50, there is an advantage that the rolling by the mandrel 58 and the rotation of the mandrel 58 are performed smoothly.

FIG. 7 shows another embodiment of the present invention.
This example is characterized in that a horn mechanism 70 for amplifying vibration is interposed between the drive shaft 1 and the metal pipe inner / outer surface processing mechanism 20.

The horn mechanism 70 has a large-diameter annular flange portion 74 integrally formed at the front end of the drive shaft 1 and a flange portion 74 at the rear end of the mounting member 22 of the metal pipe inner / outer surface machining mechanism 20. A flange portion 72 having the same diameter is integrally formed, the flange portions 74 and 72 are brought into contact with each other, and the outer peripheral portion is fixed by a plurality of bolts 76. The outer peripheral portion of each flange portion 74 has an annular convex portion 7 over the entire circumference.
2A is formed, and the other flange 74 has a step corresponding thereto. The thickness and outer diameter of each of the flange portions 72 and 74 are set such that the vibration amplification factor is maximized.

According to this embodiment, each flange 72,
Due to the flexural vibration of 74, the amplitude of the metal tube inner / outer surface machining mechanism 20 is increased as compared with the amplitude of the drive shaft 1, and the amplitude of the rolled ball 42 in the axial direction is larger than in the previous embodiment. For this reason, it is possible to further improve the above-described respective effects.

Next, FIG. 8 shows still another embodiment of the present invention. In this embodiment, the metal pipe P, which has been rolled, is further reduced in diameter and adjusted in shape behind the drive shaft 1. A second die 80 is provided.

The distance L1 from the contact point of the rolled ball 42 to the die 48 and the distance L2 from the contact point of the rolled ball 42 to the second die 80 are each set to one of the wavelengths at the excitation frequency. / 2 is set to an integral multiple of / 2. In this case, the metal pipe P resonates in the axial direction in the range of L1 and L2, the amplitude at the portion narrowed by the dies 48 and 80 increases, and the friction lowering effect increases,
This has the effect that the pull-out force can be further reduced.

The present invention is not limited to the above embodiments. For example, instead of the rolled ball 42,
A configuration using a roller-shaped rotating body is also possible. In this case, by forming grooves and irregularities on the outer peripheral surface of the rotating body, not only the inner peripheral surface but also the outer peripheral surface of the metal pipe P can be formed.
Alternatively, processing such as groove formation can be performed only on the outer peripheral surface.

Although the magnetic levitation type bearing 3 is used in the above embodiment, other bearing mechanisms can be used as long as the drive shaft can be supported so as to be displaceable in the axial direction. Bearings and the like can be changed. Further, it is a matter of course that the configuration of each unit may be changed as needed.

[0047]

[Experimental Example] A metal tube inner / outer surface processing apparatus combining the structures shown in FIGS. 7 and 8 was actually produced. This device is
A horn mechanism 70 is provided between the drive shaft 1 and the metal tube inner / outer surface machining mechanism 20, and a second die 80 is provided at a subsequent stage of the drive shaft 1 as shown in FIG. The distance L1 between them is one half of the excitation frequency.
The distance L2 between the second die 80 and the rolled ball 42 was set to four times the same.

Next, the control circuit 13 of the vibrating mechanism 4
A high frequency sine wave of kHz was applied, and the driving mechanism 1 was rotated at 30.000 rpm by the rotating mechanism 2. As a result, the driving shaft 1 generated high-frequency vibration with an amplitude of 4 μm in the axial direction while rotating. In addition, even if the drive shaft 1 was vibrated, no trouble such as noise occurred in the control circuit 9 of each bearing mechanism 3, and stable rotation could be performed without contact.

The metal tube inner / outer surface machining mechanism 20 vibrated in the axial direction at an amplitude of 20 μm, four times the amplitude of the drive shaft 1. When rolling was performed in this state, the vibration mechanism 4
The pull-out force is reduced by 40% compared to the case where
The load current of the rotating mechanism 2 was reduced by 30%. Further, the surface roughness of the metal tube P after processing was improved, and the glossiness was improved.

In the state where no vibration is applied, the drive shaft 1
No matter how the number of revolutions was changed, the metal pipe P broke when the rolling speed reached 50 m / min, but when vibrated, the rolling speed was 60 m / min at 35,000 rpm.
Could be improved.

[0051]

As described above, according to the metal pipe inner / outer surface machining apparatus according to the present invention, each of the rotating bodies is vibrated in the axial direction of the drive shaft by the vibrating mechanism, so that these rotating bodies and the metal pipe are connected to each other. Is relatively vibrated in a direction parallel to this interface, and the frictional resistance at this interface can be greatly reduced. Furthermore, by transmitting vibration to the metal pipe, the frictional resistance between the mandrel and the metal pipe and the frictional resistance between the die and the metal pipe can be similarly reduced, and the force required to pull out the metal pipe is comprehensively reduced. It is also possible to significantly increase the processing speed without causing damage to the metal tube, and to further improve the surface roughness of the metal tube.

On the other hand, when the drive shaft is supported by using a magnetic levitation type bearing, even if the drive shaft is rotated at a high speed and a high load, the wear is not caused by abrasion. There is also an advantage that vibration in the axial direction due to the vibration mechanism is not attenuated by the bearing mechanism.

Further, if a magnetic levitation type bearing is used, the drive shaft can be elastically supported in the radial direction. Therefore, even if the center of revolution of each rotating body and the center of the metal tube may be slightly shifted,
The drive shaft is elastically displaced and absorbs the shift, thereby preventing poor rolling caused by the shift. Also, when a horn mechanism is provided between the drive shaft and the metal tube inner / outer surface machining mechanism, the amplitude of the metal tube inner / outer surface machining mechanism increases compared to the amplitude of the drive shaft, and the amplitude of the rotating body in the axial direction increases. As a result, the effect of reducing the pulling force is further improved.

In addition to providing a second diameter reducing mechanism,
When the distance from the contact point of the rotating body to the diameter reducing mechanism and the distance from the contact point of the rotating body to the second diameter reducing mechanism are each an integral multiple of 1/2 of the wavelength at the excitation frequency. Has the effect of increasing the amplitude of the metal tube at the position narrowed by the first and second diameter reducing mechanisms, further increasing the friction reducing effect, and further reducing the pulling force.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a metal pipe inner / outer surface processing apparatus according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a longitudinal sectional view showing a metal pipe inner / outer surface machining mechanism of the apparatus.

FIG. 4 is a front view showing a metal pipe inner / outer surface machining mechanism of the apparatus.

FIG. 5 is a partially broken side view showing a floating plug and a mandrel of the device.

FIG. 6 is a front view showing a floating plug and a mandrel of the device.

FIG. 7 is a longitudinal sectional view showing a metal pipe inner / outer surface machining mechanism according to another embodiment of the present invention.

FIG. 8 is a configuration diagram showing still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive shaft 1A Insertion hole 2 Rotation mechanism 3 Magnetic levitation type bearing (bearing mechanism) 4 Vibration mechanism 7 Rotor (part to be attracted) 8 Electromagnet 9 Radial control circuit 10 Radial sensor 11 Drive plate (part to be attracted) 12A, B Electromagnet 13 Axial direction control circuit 15 Axial direction sensor 16 High frequency generator 20 Metal tube inner / outer surface processing mechanism 42 Rolled ball (rotary body) 46 Oil supply nozzle 48 First die (diameter reduction mechanism) 50 Floating plug 58 Mandrel 70 Horn mechanism 80 2nd die (2nd diameter reduction mechanism)

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tsuneo Haba 1975-2 Shimoishido, Kitamoto-shi, Saitama Mitsubishi Materials Corporation Kitamoto Works (56) References JP-A-62-292215 (JP, A) 63-47376 (JP, Y2)

Claims (5)

(57) [Claims] 1. A diameter reducing mechanism for reducing the diameter of a metal tube, and an inner and outer surface of a metal tube arranged at a subsequent stage of the diameter reducing mechanism and further imparting a predetermined shape to the inner and outer surfaces of the metal tube processed by a diameter reducing device. A metal pipe inner / outer surface processing device comprising a processing mechanism, wherein the diameter reducing mechanism is inserted into the metal pipe and a die that is pressed against the outer surface of the metal pipe, and floats at a position corresponding to the die. A floating plug, the metal pipe inner and outer surface processing mechanism, a plurality of rotating bodies pressed against the outer surface of the metal pipe, a driving mechanism for revolving each of these rotating bodies around the axis of the metal pipe, A mandrel rotatably connected to the floating plug and floating at a position corresponding to the plurality of rotating bodies in the metal tube, wherein the driving mechanism supports the plurality of rotating bodies and A hollow drive shaft having an insertion hole through which the metal tube passes, a bearing mechanism that supports the drive shaft rotatably and axially displaceable, and a rotation mechanism that rotates the drive shaft axially displaceable. And a vibrating mechanism for vibrating the drive shaft in the axial direction. The bearing mechanism includes a ferromagnetic attracted portion provided on the drive shaft, a plurality of electromagnets disposed adjacent to an outer periphery of the attracted portion, and a diameter of the drive shaft. A sensor that measures the amount of displacement in the direction, and a control mechanism that controls the amount of current to each of the electromagnets in accordance with the output signal of the sensor and maintains the axis position of the drive shaft at a fixed position. The apparatus for processing the inner and outer surfaces of a metal pipe according to claim 1. 3. The vibrating mechanism includes: a ferromagnetic attracted portion provided on the drive shaft; and a plurality of electromagnets provided adjacent to the drive shaft of the attracted portion in an axial direction of the drive shaft. 3. The metal tube inner / outer surface processing apparatus according to claim 1, further comprising a control mechanism that controls an amount of electricity to these electromagnets and vibrates the drive shaft in the axial direction. 4. A horn mechanism for amplifying an amplitude in an axial direction is interposed between the drive shaft and the metal pipe inner / outer surface machining mechanism. Metal tube inner and outer surface processing equipment. 5. A second diameter reducing mechanism for reducing the diameter of the metal tube derived from the drive shaft again is provided at a subsequent stage of the drive shaft, and the rotating body is brought into contact with the metal tube. And the distance from the contact point of the rotating body to the contact point of the first diameter reducing mechanism, and the distance from the contact point to the contact point of the first diameter reducing mechanism. 5. The apparatus for processing the inside and outside of a metal pipe according to claim 1, wherein the apparatus is set to an integral multiple of a half wavelength at a vibration frequency.