KR910000217B1 - Method and apparatus for the corrugating of metal tubes - Google Patents

Abstract

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Description

Method and apparatus for corrugating metal tube

1 is a schematic view of an apparatus for corrugating a metal tube according to the present invention.

2 is a perspective view of the wave forming apparatus and the wave forming tool.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a graph showing the characteristics of the cable produced by the present invention.

5 and 6 are cross-sectional and perspective views of cables for through-holes having corrugated tubes made by methods and apparatus for corrugating metal tubes.

7 and 8 are a cross-sectional view and a perspective view of an electric cable according to another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: coil 2: metal strip

3: roller pair 4: welding apparatus

6: wave shaping tool 8: rotary tool

9: cable drum 10: ball bearing

11: guide bush 12: housing

13: corrugated disk 14: ring bush

The present invention provides a smooth tube, preferably a smooth tube having a longitudinally welded seam, in continuous operation through a bush, wherein a corrugating tool acts directly on the smooth tube behind the bush. And, in the corrugating tool, a corrugated disk having an opening larger than the diameter of the smooth tube is supported, and eccentrically so that the corrugated disk can be freely rotated in the corrugator head, which can be rotatably driven. A method of corrugating a supported metal tube.

A method for producing corrugated tubes is known from the Federal Republic of Germany Patent Publication No. 1,086,314, which is produced by slotted tubes and subsequent slot surface welding from a long strip of metal strip by continuous change machining. The corrugated tube is formed by a ring-shaped corrugated disk in which a tube wrapped with thin film metal is rotated around the smooth tube. In this case, since the corrugated disk in the corrugating head supporting the corrugated disk is eccentrically positioned and inclined at an angle to the axis, the corrugation is spirally formed to have a fixed corrugation depth and pitch. Is done. Using the apparatus described above, it is possible to produce corrugated tubes in an economical manner. However, with such a device, only a corrugated tube having a relatively flat corrugation can be manufactured. Such corrugated tubes can be wound on conventional cable drums and used, for example, as sheaths or conduits for electrical cables.

In the method cited above, if a corrugated disk with helical strain ribs is used, so-called parallel corrugated tubes can be produced using the cited method (German Publication No. 1,916,357). have.

In order to produce a deeper wave form, the wave forming is carried out by the above-described method under the longitudinal axial pressure, and the metal tube is subjected to braking action, for example, as can be seen in the penetration direction after the wave forming process. In such a method, the waveform shaping tool, that is, the waveform shaping disk is not subjected to the force acting on the disk in the lateral direction, so that a deeper shaping can be achieved. However, such a method is difficult to implement because it is impossible to apply a constant braking force. In other words, the braking force must be constant for uniform waveform shaping.

Commercially available flexible corrugated hoses (metal hoses) have been produced discontinuously by introducing several actuation corrugations starting in the smooth tube longitudinal direction, which are compressed during corrugation under axial pressure.

In this way no larger length can be produced.

It is therefore an object of the present invention to improve the conventional method described above to provide a metal tube corrugation forming method in which a metal tube, that is, a corrugated tube having a deep and close waveform, can be produced continuously, i.

The object of the present invention is achieved by deflecting a corrugated tube according to the present invention to the working position of the corrugated disk in the manufacturing direction.

As a result of this study, it can be seen that the corrugated disk pushes the bow wave to the wall in front of the disk during corrugation. The "bow wave" becomes larger due to deflection of the corrugated tube or bending of the corrugated tube in the direction of the acting position of the corrugated disk. The deflection or bending process is designed to bend at each instant during the corrugation process such that the corrugated tube is placed in the compressed region of the corrugated disc and the "bow wave" bent. The rotary bending process provides additional material to the corrugated disc, which allows for deeper corrugations without difficulty.

30

인데, 이는 파형성형 디스크의 작용위치와 반대측에 대해 전진 또는 후진되게 파형성형될 관의 재료에 따르게 된다. 따라서, 파형성형 디스크의 회전방향에서 알 수 있는 편향력의 작용점은 예를 들어, 구리와 같은 연성물질인 경우에는 180

보다 더 적게 설정되고 강철 및 스테인레스강과 같은 경성물질인 경우에는 180

보다 더 크게 설정된다.In a particularly preferred embodiment of the method according to the invention a force is exerted on the corrugated tube on the opposite side of the momentary position of the corrugated disk. This force causes the tube to bend or deflect between the bush supporting the smooth tube and the operating position of the force. An essential feature here is that the force acts on the corrugated tube at a distance of at least 0.5D of the tube outer diameter, preferably at a distance (a) of at least 0.8D. D is the outer diameter of the smooth tube. The eccentricity e, which is deflected out of the manufacturing direction by the corrugated tube, satisfies that e / a is less than 1 or preferably less than 0.2. The maximum deviation from the point of action of the deflection force in the circumferential direction is

30

This depends on the material of the tube to be corrugated forward or backward relative to the opposite side of the actuation position of the corrugated disk. Therefore, the action point of the deflection force, which can be seen in the rotational direction of the corrugated disk, is 180 in the case of a soft material such as copper, for example.

180 for less set and hard materials such as steel and stainless steel

Is set larger than.

The invention also relates to a device for carrying out the method, which device comprises a rigidly installed bush supporting a smooth pipe which is known in the direction of manufacture of the pipe and a rotating corrugating tool acting on the smooth pipe behind the bush. Wherein the corrugating tool comprises a corrugated head and a corrugated disk that is rotatably driven, the corrugated disk being freely rotatable and arranged to be eccentrically supported. Such a device is preferably provided with a corrugating tool behind the corrugating head, which is fixed to the corrugating head while the tool rotates at the same speed as the corrugating head and acts on the tube to be corrugated. The tool is designed in a ring shape so as to guide the tube well during deflection. It is advantageous to have a ring rotatably supported on the restraining means fixed to the corrugated head, by which the friction force seen in the circumferential direction is reduced to a minimum. The ring-shaped tool is shaped like a nipple, that is, the inlet and outlet openings are formed into a bell-mouth. In order to enable the corrugating tool to conform to the diameter of the tube and the material of the tube, the tool is fixed to the corrugating head so that it can be adjusted in the circumferential and radial directions. The spacing between the shaping tool and the shaping disc can be changed by means of a positioning ring which is an insertion ring. The bush may be adjusted in the longitudinal axis direction prior to commencing the shaping process. Therefore, it is advantageous to choose a larger spacing from the corrugated disk for soft materials than hard materials.

The invention also relates to a multi-core electrical energy cable, and more particularly to a supply cable for boring equipment, for example a boring pump, in which adjacent cores are each formed by a closed metal sheath in the form of a corrugated pipe. Protected.

Drives are used at depths of more than 3000 meters underground to carry out drilling of oil or natural gas. Such drives, in particular pumps, are supplied with electrical energy at the ground surface. For this purpose, electric cables are required that must meet very specific requirements. In other words, such a cable needs to be designed to withstand the pressure at the above-described depth, and it is also necessary to consider a temperature of 120 ° C. or higher added to the temperature generated in the form of loss heat by the drive device. All that is required for the cable to function during long periods of work is to make it insensitive to permeate gas or seawater when drilling is carried out in the fluid medium, such as in the boring hole or boring shaft. Consideration should also be given to the high tensions occurring in the case of free suspension.

Cables for the cited purpose, in which the cores are each covered with a metal corrugated cover, are described in JP-A-2,853,100. Each adjacent core covered by the corrugated shroud is surrounded by a metal corrugated shroud in accordance with a further concept of a conventional device. Since the corrugated cover is rounded by the cover, the final diameter of the table can be used for only a few purposes. For example, if the distance between the drill casing and the so-called drill sheath in which the cable is generally fixed is very small, known cables cannot be used. In addition, it is manufactured in a design having a lower pressure resistance than a relatively large waveform appearance. According to the addition of JP 2,853,100, each corrugated tube of adjacent cores is surrounded by high strength steel wire armoring on strip windings commonly applied to all cores. . The high strength steel wire sheathing provides essentially to compensate for tensile forces. And the strip winding serves to keep the three cores in the desired position. In order to obtain a pressure resistance of 200 bar designed for the inner diameter of the corrugated tube fixed by the inner diameter of the electrically insulating core, it is necessary to increase the wall thickness of the corrugated tube, but this decreases the flexibility of the cable. do. Even the proposal to use so-called double corrugated trauma does not significantly increase the pressure resistance of the corrugated tube.

Cables of this type must have a pressure resistance of at least 200 bar, preferably at least 300 bar, and can also be manufactured without spending a lot of money economically. In addition, the cable should have a sufficiently high longitudinal tensile strength.

In the case of the cable manufactured by the above-described method, the corrugation of the tubes has a short length of 33 to 67%, preferably 45 and 55% of the length of the corrugated tube with respect to the smooth tube by the wave depth and the corrugation pitch. It is designed to be.

In the known cable, the wave length of the metal tube is shortened by about 15%, while in the case of the present invention, it is selected to be shortened by about 45 to 55%.

The pressure resistance of a tube against external pressure is described by the equation:

이고 그리고

는 매끄러운 관의 길이 l의 파형성형된 관의 대응길이에 대한 비율이다. 금속의 냉간성형에 의해 항복점을 상승시킬 수 있다는 점은 공지되어 있다. 만일 매끄러운 관을 축소시키는 것이 냉간성형에 의해 이루어진다면 이와 같은 축소로 파형성형 심도도 동시에 축소되기 때문에 임계압력은 다음과 같은 방정식으로 결정될 수 있다.Where δ is the yield point of the metal, ρ is the wall thickness of the tube, and γm is the average radius of the corrugated tube

And

Is the ratio of the length of the smooth tube l to the corresponding length of the corrugated tube. It is known that the yield point can be raised by cold forming of the metal. If the shrinking of the smooth tube is made by cold forming, the critical pressure can be determined by

사이의 관계가 알려져 있다면, 임계압력은 다음과 같이 된다.Δ and cold forming

If the relationship is known, the critical pressure becomes

In the case of austenitic steel, the critical pressure increases at a value between 1.3 and 3 and a value between 1.3 and 4.

To this end, the high-resistance to pressure obtained by the reduction of the smooth tube to the corrugated tube should be of smaller average radius.

It is more important that the shrinkage of the smooth tube should not be done elastically or plastically. The design sheath, which is preferably applied helically, acts to prevent the cable from lengthening. Such sheathings should be considerably flexible, that is, they should not limit the flexibility of the cable, while being able to reliably prevent the stretching of corrugated tubes due to vertical arrangement or high pressure. If the cable is secured to a limited distance in the boring hole, for example a drill casing, the sheath may be removed under certain circumstances.

In a particularly useful embodiment of the present invention, the ratio of the outer diameter of the tube to the wall thickness is between 60 and 125 and the ratio of the wave depth to the wall thickness is between 8 and 25. The above quoted values allow for continuous production from the metal strip coming in in the longitudinal direction. If the corrugated tube is a double wall according to a further concept of the present invention, the pressure accompanying the tube's capacity is also increased. Next, the smooth tubes are formed so that they are fixed exactly on one another so that they are jointly corrugated. The sheathing is preferably composed of a number of high strength wires applied in a spiral manner. The wires should then be applied as a twist length between 2D and 6D, where D is the outer diameter of the corrugated tube. This dimension reliably prevents the elongation of the tube in the case of tensile or pressure loads. Another arrangement of sheathing is achieved by applying a plurality of high strength wires to the tube in an alternating twist direction and holding them by at least one high strength wire or at least one high strength strip having a short twist length and high prestress. The form of this embodiment is particularly bonded to the diameter, since complicated winding equipment is not necessary at the time of manufacture. In both embodiments, the plurality of wires should be selected such that the surface of the corrugated tube is covered by nearly 100%.

However, it is also possible to select an outer sheath from a helically applied metal strip with overlapping strip edges, the cross section of which is formed so that the edges of the strip are integrally engaged with each other in the overlapping region. The twist length in this embodiment embodiment is substantially short, but it is necessary for the metal strip to be in tangible contact with the corrugated tube surface. This type of sheath also prevents noticeable elongation of the corrugated tube when it depends on the pressure load or where the cables are arranged vertically. The flexibility of the cable is not substantially reduced by the sheathing. In preparation for corrosion, the metal tube and sheath should be of the same material. Austenitic steels are very preferably used because they are corrosion resistant to most media and exhibit high dimensions for cold hardening.

However, in many applications other materials, such as galvanised steel, copper or copper alloys, may also be used, but such materials need to not increase the corrosion penetration by the synthesis of such materials.

Each corrugated tube may consist of a braid of fibers, preferably of a metal wire. This knitted fabric increases the pressure resistance of the tube and the tensile strength of the cable. The corrugated tube is then placed firmly on the insulation of the core, preventing the core from moving in the corrugated tube.

Hereinafter, with reference to the accompanying drawings of the present invention will be described in detail.

1 shows a coil in which a metal strip 2 to be formed is drawn out of the coil. The strip 2 is cut to the desired dimensions between two circular cutters, not shown, to form a tube slotted by a pair of rollers. Using a welding device 4, preferably an electric arc welding device, the strip edges of the slotted tube are welded together and closed but smoothed, and the tube is held by the feeder 5 and supplied to the corrugating tool 6. do.

It is preferable to use as a feeder a so-called collet feeder, which is known from Federal Republic of Germany Patent No. 1,164,355. The corrugated tube 7 emerging from the corrugated tool 6 is deflected from the manufacturing direction by the rotary tool 8 described below. The corrugated tube 7 is then wound on a conventional cable drum 9. The rotary tool, which is a compression tool, constitutes a deflection means.

The wave shaping device and the deflection device are shown enlarged in FIGS. 2 and 3. The shaping head constituting the shaping tool 6 is supported by a roller bearing on the fixed guide bush 11. The guide bush 11 consists of a sliding bush 11a, a fixed bush 11b and an outer bush 11c, which are firmly connected to the casing of the device.

The shaping head is rotatably driven in an unillustrated manner, on which its end face bears the fixed casing 12. The corrugated disk 13 is fixed to the annular bush 14, which is supported to be rotatable by the ball bearing 15. The corrugated disk 13 is rotatably supported on the tube axis and eccentrically supported so that the rolled head is rolled on a smooth tube surface when the rolled head is driven in rotation, and in this case the annular corrugated disk 13 Spiral corrugation is performed at If a corrugated disc with helical strain ribs is used, an annular corrugation is achieved.

The rotary tool 8 is attached to the end face of the casing 12 and this tool deflects the corrugated tube 7 from the manufacturing direction. The rotary tool 8 consists of a flanged portion 16 which is fixed to the casing 12 via an intermediate washer 17 so that it can be separated in the radial and circumferential directions. Within the part 16 there is arranged a bush 18 in which the inner hole is shaped in the longitudinal direction towards the end. The spacing between the bush 18 and the corrugated disk 18 can be changed by the positioning ring 19. The tool 8 is fixed to the casing 12 so as to eccentrically rotate at the center axis of the corrugated head and at the center axis of the smooth tube, thereby continuously rotating the corrugated tube 7 from the center axis. The eccentricity of the corrugated disk 13 is present on the opposite side of the tool 8 so that more material can be used in the corrugated corrugated disk 13 for corrugation by bending the corrugated tube 7. The waveform will be as deep as possible. The spacing between the corrugated disk 13 and the bush 18, i.e. the distance between the corrugated disk 13 and the center line of the bush 18, depends on the outer diameter of the smooth tube, which is at least 0.5D. Should be. This is especially useful for distances between 1 and 1.5D. Deep corrugation is also the angle at which the corrugated tube 7 is deflected from the central axis. Since the angle itself is very difficult to measure, a quotient of the eccentricity e of the tool 8 and the spacing a, i / a, is used as an aid for this size, which quotient should be less than 1 Less than 0.15 is good. The eccentricity e is the distance between the center axis of the tool 8 and the center axis of the corrugated head.

The bush 18 is preferably impeded to the portion 16 by a ball bearing so as to be freely rotatable.

씩 분리되어 있다. 상기와 같이 도시된 배열은 "통상의 경성물질"을 위한 이상적인 배열이다. 굽힘전진 또는 굽힘 후 되는 다음과 같은 요인에 달려있다.3 shows a section cut along the line AA of FIG. 2. The operating points present on the corrugated disk 13 and the tube 7 of the bush 18 are disposed on the axis Z and thus 180

Are separated. The arrangement as shown above is an ideal arrangement for the "normal hard material". It depends on the following factors: bending forward or after bending.

That is, a) the properties of the tubular material, b) the geometrical dimensions of the tubing, c) the spacing between the working points of the force of the corrugated disk 13 and the working points of the bush 18, d) the corrugated head 6 Eccentricity of the tool (8) with respect to the central axis of (e).

이고, 반면에 스테인레스강과 같은 비교적 "경성물질"의 경우에는 볼 베어링(15)의 전진각도는 15

인 것이 바람직하다. 이와 같은 전진각도와 후퇴각도는 제3도에서 ＋ 및 －로 표시되어 있다.For example, in the case of "soft materials" such as copper, the retraction angle of the roller bearing 10 is 10

On the other hand, in the case of a relatively "hard material" such as stainless steel, the advancing angle of the ball bearing 15 is 15

Is preferably. Such forward and backward angles are indicated by + and-in FIG.

의 내부직경과 0.5

의 벽두께를 가진 매끄러운 구리관은 파형성형된 관으로 변형되는데, 이러한 파형성형된 관의 외부직경은 다시 40.4

가 되고, 개구, 즉 내부직경은 25.7

가 된다.The waveform of the tube 7 is shown only schematically in FIG. 2. In fact, such waveform shaping is actually deeper in depth. Thus, for example 40.4

Inside diameter and 0.5

A smooth copper tube with a wall thickness of is transformed into a corrugated tube, which has an outer diameter of 40.4.

Opening, ie the inside diameter is 25.7

Becomes

4 shows the yield strength on the ordinate and the length ratio I ₀ / I ₁ on the abscissa. The yield strength increases between a value of 1 and 1.7 of I ₀ / I ₁ . This increase is most pronounced in the case of austenitic steels (upper curves). In the case of copper (lower curve), the rise is rather slow. At larger ratios, the yield strength no longer increases at all. 5 to 8 show boring hole cables with corrugated tubes, each manufactured by the process described above.

The cable shown in FIGS. 5 and 6 consists of three electrical conductors 21, either solid conductors of individual wires or cable composites, which are placed side by side on a thin layer of polyimide 22. FIG. The layer 22 is disposed on the actual electrical insulating material 23 made of ethylene-propylene compound. Such an insulating material has excellent properties in terms of high heat resistance and moisture resistance. Below this layer 23 is arranged an additional layer 24 of nitrile rubber. Such materials have good mechanical properties and are highly resistant to oil. On the outer surface of layer 24 is a deeply corrugated tube 25 that is applied to each core in a continuous process. This corrugated tube 25 is formed by coating a core with a longitudinally incoming metal strip, forming the metal strip around a core for forming a tube, and welding longitudinal seams. The waveform will be formed. In this way a sheathed core of any desired length can be produced, thus minimizing the twist of the cable length. The corrugated tube 25, which is made in an advantageous manner of austenitic steel, is covered in a braid 26 consisting of each wire and again sheathed in austenitic steel. All three cores are surrounded by a corrugated molding cover, that is, a corrugated pipe 25 and a common sheath 27 that is firmly attached to the metal knitted fabric 26. The sheathing 27 is formed from a metal strip helically applied to the core. The strip edges of the two entry windings are claw-shaped so that they are frictionally firmly connected between the respective windings. It is preferable to use austenite steel as the material for the exterior coating 27.

The corrugated tube 25 according to the present invention is corrugated such that the tube is reduced by about 50%.

A number of cables made in accordance with the present invention were tested for pressure and the results confirmed that the cable of the present invention can withstand pressures of more than 340 bar without significant financial expenditure by deeply corrugated tubes.

7 is a cross-sectional view of an electric cable according to another embodiment of the present invention, and FIG. 8 is a perspective view thereof. Three conductors in which copper is preferred are indicated by reference numeral 31, which is formed from either a solid conductor or a cable composite. The conductor 31 is surrounded by an insulating layer 32 made of an ethylene-propylene compound. The three conductors thus insulated are preferably wound together. The conductor wound as described above is surrounded by an additional insulating layer 33 made of nitrile rubber having heat resistance, oil resistance and moisture resistance. The insulating layer 33 is a corrugated tube made of a longitudinal metal strip formed in the tube and welded and corrugated. Because of this manufacturing method of the present invention, the cable can be manufactured without limitation in length, and the twisting of the cables can be sufficiently prevented. The sheath 35 is arranged on the sheath of the corrugated tube, which consists of a plurality of wires applied as a large twist length. The corrugated tube 34, such as the wire of the sheath 35, is made of austenitic steel. The corrugated tube is preferably a double wall.

의 외부직경과 29.8

의 내부직경과 3.9

의 파형성형 피치와, 0.5

의 벽두께와 그리고 5.35

의 파형심도를 가진　전기케이블이 압력실에서 조사되었다.41.5 stainless steel corrugated pipe 34

With external diameter of 29.8

With the inner diameter of 3.9

Waveform forming pitch of 0.5

Wall thickness and 5.35

An electrical cable with a waveform depth of was investigated in the pressure chamber.

까지의 압력에 견딜 수 있게 되어 있다.These cables are 500kg /

It can withstand pressure up to

The outer sheath 35 is provided to prevent elongation of the corrugated tube 34 by the weight of the cable itself, for example in the case of a vertical cable arrangement. For this reason, it is important that the outer coating 35 is firmly attached to the corrugated pipe 34.

Claims (20)

Continuously passing the smooth tube through the bush forming the centerline of the metal tube and placing the tube in a position directly in contact with the back of the bush by the corrugating tool, the corrugating mold having an inner diameter larger than the diameter of the smooth tube The tool's corrugated disk presses the tube at the contact position and is mounted to freely rotate freely in the corrugating head for shaping the waveform on the tube and as a result of the passing the tubular corrugated portion is formed from the tube behind the disk. Forming a corrugated tube portion and deflecting the corrugated tube portion from the centerline to the contact position of the corrugated disk with the compression tool, wherein the compressed air is a tube bending force between the bush and the disk. Spacing behind the fixed bushing to avoid receiving the corrugated disk It is spaced apart from the large rear waveform mold disc by a distance waveform method for forming a metal tube, characterized in that. 2. The method of claim 1, wherein the biasing force of the deflection step acts on the corrugated tube on the viewing surface opposite the instantaneous contact position of the corrugated corrugated disc. 3. The method as claimed in claim 2, wherein the spacing (a) is at least 0.8D of the tube outer diameter D. 3. The method of claim 2, wherein the biasing force acts on the corrugated tube spaced apart from the corrugated disk by a measurement in the direction of the centerline of at least 0.5D. 5. The method of forming a corrugated metal tube according to claim 4, wherein (a) the eccentricity e, which is obtained when the corrugated tube is deflected from the center line, has a relationship e / a of the spacing of 1 or less. 5. The method for forming a corrugated metal tube according to claim 4, wherein the eccentricity e that is obtained when the corrugated tube is deflected from the centerline has a relationship e / a of 0.2 or less. A device for corrugating a tube, the tube passing through the device, having a centerline of a smooth tube and having a stationary bush for supporting the tube and a rotating corrugating tool acting on the tube behind the bush and The forming tool includes a rotatable corrugating head, wherein the corrugated disk is eccentrically retained and freely rotatable to pressurize the tube at the contact position with the disk and the corrugated portion of the tube restrains the tube. A metal tube corrugating apparatus configured to move with said tube behind said corrugated disk to form a corrugated tube portion as a result of having passed therethrough, said metal tube corrugating apparatus having a compression tool behind said corrugated head, said compression tool having said waveform Acting on the corrugated section while rotating at the same speed as the forming head And the compression tool is spaced behind the corrugated disk by an interval greater than the interval at which the corrugated disk is spaced behind the fixed bush, and the compression tool 8 forms the corrugated tube portion from the center line. Metal tube corrugation forming apparatus, comprising means for deflecting toward the contact position of the disk. 8. The apparatus of claim 7, wherein the compression tool is fixed to the corrugating head. 8. The metal tube corrugation forming apparatus according to claim 7, wherein the compression tool has a ring shape. 10. The metal tube corrugating apparatus according to claim 9, wherein the compression tool includes a ring support fixed to the corrugating head, and a ring is mounted on the support. 11. The metal tube corrugation forming apparatus according to claim 10, wherein the compression tool is fixed to the corrugating head to move in both the circumferential direction and the radial direction. 11. The apparatus of claim 10, wherein the compression tool includes a positioning ring and the ring support supports the positioning ring for adjusting the spacing between the compression tool and the disc that can be adjusted by insertion of the positioning. Metal tube corrugating molding apparatus comprising a. The zone of claim 2 wherein the zone on the opposite side of the tube in which the biasing force acts circumferentially is in a direction opposite to the contact position.

30

Metal tube corrugation forming method characterized in that it is within. 8. The point of action of the biasing force as seen in the direction of rotation of the corrugated disk is 180 from the contact position if the tube is made of a soft material.

If set below and made of a relatively hard material 180 from the contact position

Metal tube corrugation forming method, characterized in that set above. 10. The inlet and outlet according to claim 9, wherein the compression tool is formed by a bush 18 having an inner hole, and the corrugated portion extends into the hole, and the inner hole has an inlet and an outlet widening in a longitudinal shape toward the end. Metal tube corrugating molding machine. 8. The apparatus of claim 7, further comprising means for moving the bush axially away from the corrugating tool prior to commencing the corrugating process. A metal tube corrugating apparatus for corrugating a metal tube with the apparatus, the apparatus comprising: a fixed guide means for linearly guiding the tube and a circle on the tube in a compressed position to form the corrugated tube portion; Corrugating means for pressurizing the columnar corrugation portion, and bending means behind the corrugation forming means to bend the corrugated tube portion to a compressed position, wherein the corrugated portion passes through the back of the corrugating means, And wherein the bending means is arranged at a distance away from the corrugation forming means by a distance apart from the corrugation forming means which is larger than an interval spaced behind the fixed guide means. 18. The method according to claim 17, wherein the wave shaping means continuously compresses the circumferential wave shaping portion in a circumferential direction at a compression position and the wave shaping portion is continuously moved around the circumference of the tube, and the bending means is in the compression position. And continuously bending the corrugated tube portion in a direction moving continuously around the circumference of the tube. 19. The corrugating means according to claim 18, wherein the corrugating means comprises an annular corrugated ring having an inner hole larger than the cross section of the tube and means for rolling the annular ring around the circumference of the tube to compress the corrugated portion into the tubular shape. And the ring penetrates through the hole. 20. The corrugated tube of claim 19, wherein the bending means includes a compression ring having an inner hole and means for rotating the compression ring to be eccentric to a centerline of the tube formed at a passage through the inner hole of the corrugated ring of the tube. Passing through said hole to bend by compressing a portion into said ring.

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