JPH08118073A - Production of tube filled with powder and granular material - Google Patents

Abstract

PURPOSE: To provide a method to produce a tube filled with powder and granular material without causing cracks on the shell skin by preparing a sound joint welded zone. CONSTITUTION: In a producing method of a tube filled with a powder and granular material that a powder and granular material 4 is supplied to a tube shaped body 1 on the way of forming a metal strip to the tube shaped body 1, both edge faces of the tube shaped body 1 are joined with the high frequency welding and the welded tube 11 filled with the powder and granular material 4 is subjected to diameter-contraction treatment, the front face of the material 4 supplied to the tube shaped body 1 is coated with the hardening coating material with an atomization nozzle 15, the hardening film is formed and then both edge faces of the tube shaped body 1 is joined with the high frequency welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a powder / granule-filled tube in which carbon steel, stainless steel, copper alloy, aluminum alloy or other metal tube is filled with the powder / granular material.

Here, the powder or granules mean powder or granules such as welding flux, oxide superconductor, and additive for molten steel.

[0003]

2. Description of the Related Art A flux-cored seamless wire for welding is one type of powder-filled tube. In the production of this seamless wire, the strip steel is slit to the required width,
The strip steel after slitting is gradually formed from a U-shape to an O-shape by a forming roll. During this forming, the flux is supplied from the opening along the longitudinal direction of the U-shaped strip steel to the strip steel valley portion by the feeder. Then, while forming into an O-shape, the opposite edge surfaces of the opening are joined by welding, and the diameter is subsequently reduced. Further, after annealing if necessary, the tube filled with the flux is drawn into a desired diameter and wound up to obtain a product.

As a welding method for manufacturing the above flux-cored wire for welding, high frequency welding such as high frequency induction welding and high frequency resistance welding is widely used. In all of these welding methods, when formed into a substantially O shape, the Joule heat generated by the high frequency current heats the edge surface of the opening to the melting temperature and presses the opposing edge surfaces with a pair of squeeze rolls.

By the way, when the diameter of a tube filled with flux and welded is reduced by rolling, wire drawing, or the like, cracks may occur in the outer shell of the tube. The cause of this crack is considered as follows. During welding, some of the flux particles are adsorbed on the opening edge surface of the tubular body. That is, at the welding position, the opening edge surface of the tubular body becomes a magnetic pole due to the magnetic field generated by the welding current. Therefore, the ferromagnetic component of the flux particles is attracted by the magnetic force and is attracted to the opening edge surface. At this time, the weak magnetic component is also adsorbed on the edge surface of the opening along with the ferromagnetic component. The flux particles adsorbed on the edge surfaces of the openings become inclusions in the welded joint and cause welding defects. Then, due to this welding defect, cracking occurs when the pipe diameter is reduced. The cracks when the diameter is reduced are directly introduced into the product, that is, the flux-cored wire for welding, and deteriorate the welding workability.

As one of the techniques for solving such a problem, there is a "method for producing a tube filled with powder" disclosed in Japanese Patent Laid-Open No. 54-109040. In this technique, the powder is supplied so that it does not fill the tubular body, and a gap or distance is provided between the joint weld and the surface of the supplied powder layer, so that the powder rises to reach the opening edge surface. I try not to. There is a "composite wire for welding" disclosed in Japanese Patent Application Laid-Open No. 60-234794, which is filled with substantially non-magnetic powder of a powder raw material having a relative magnetic permeability of 1.10 or less, and the powder is magnetically attracted. Prevents adsorption to the edge surface of the opening due to force. Also, there is a "method for producing a filler wire" in Japanese Patent Laid-Open No. 60-234792, in which a non-magnetic material is dispersed in an upper layer in a layered manner and a ferromagnetic material or a ferrite-based material is dispersed in a lower layer, and the non-magnetic material layer in the upper layer enhances the strength. The magnetic material or the ferrite material is prevented from being attracted to the opening edge surface.

[0007]

As the powder or granular material to be supplied into the tubular body, various raw material powders are selected according to the purpose of use of the powder or granular material filling pipe, and the powder is in the state as it is, that is, non-granulated or granulated. And then used. For example, in the flux used for flux-cored wire for welding, rutile sand, magnesia clinker, etc. as slag generator, sodium silicate as arc stabilizer, potassium titanate, etc., low C-Fe-Si, Fe as deoxidizer / alloying agent. -Si
-Mn, Al-Mg, and other weak magnetic raw material powders are mixed as a welding performance agent, and ferromagnetic raw material powders such as iron powder and iron oxide are added for improving the welding speed, adjusting the flux filling rate, and welding workability. It is added as a regulator. The selection of various raw material powders as a welding performance agent or a regulator and the mixing ratio of these raw material powders in the flux are designed in advance according to the intended use of the flux-cored wire for welding.

Usually, in the case of granulation, all the above-mentioned raw material powders are contained in a single flux particle, and in the case of non-granulation, all the selected raw material powders are each a single powder. Is formulated as. Therefore, when granulating, ferromagnetic raw material powder such as iron powder, iron oxide, and iron alloy constitutes flux particles together with other weak magnetic raw material powder, and when non-granulating, iron powder, iron oxide, iron alloy, etc. The ferromagnetic raw material powder of is mixed as it is. That is, there is a sufficient risk of flux particles magnetically adhering to the opening edge surface which is magnetically poled at the time of high frequency welding in both cases of granulated and non-granulated flux. Due to the characteristics of the flux particles themselves, which are easily affected by the magnetic field, the above proposal (Japanese Patent Laid-Open No. 54-10).
9040, JP-A-60-234794, JP-A-60-2
34792), the fact is that practically satisfactory results have not been obtained yet.

That is, the one disclosed in JP-A-54-109040 has almost no effect on the soaring of powder containing a small amount of ferromagnetic raw material powder, and JP-A-60-234.
No. 794 cannot contain ferromagnetic raw material powder at all. Further, in JP-A-60-234792, the upper layer is a non-magnetic material and the lower layer is a ferromagnetic material (or a ferrite material). Due to the dehydrogenation heat treatment of the flux, the ferromagnetic materials (iron powder, etc.) are likely to sinter and coarsen, and when sintered, the pipe outer shell may be locally thinned due to the subsequent diameter reduction, resulting in frequent disconnection. become. As described above, all of these conventional techniques have practical problems, and the problem of preventing the occurrence of skin cracks when the pipe diameter is reduced still remains. Once a skin crack occurs, even a minute crack initially extends in the longitudinal direction of the tube as the reduced diameter size of the tube becomes smaller, and becomes a length that cannot be ignored in the product size.

Therefore, according to the present invention, by obtaining a sound welded joint, it is possible to improve the product yield by eliminating the cracking of the outer cover when the pipe is reduced in diameter, and to manufacture a powder-particle-filled pipe having good product quality. The purpose is to provide a method.

[0011]

The method of manufacturing a powder-filled tube according to the present invention is to supply the powder into the tubular body while forming the metal strip into the tubular body so that both edge surfaces of the tubular body are In a method of manufacturing a powder-filled tube that is joined by high-frequency welding to reduce the diameter of a welded tube filled with powder, a curable paint is applied to the surface of the powder supplied into the tubular body to form a cured film. After that, both edge surfaces of the tubular body are joined by high frequency welding.

Further, the present invention is characterized in that, in the above-mentioned method for manufacturing a powder-filled tube, the curable paint is an ultraviolet curable paint. Furthermore, it is characterized in that the curable coating material is applied to the surface of the powder or granular material by an atomizing nozzle. Furthermore, the particle size of the powder is 300 μm or less.

[0013]

In the present invention, a curable coating material is applied to the surface of the powder or granular material supplied into the tubular body, and then a curing treatment is performed to form a film-like cured film (hereinafter referred to as a coating film). The shielding effect of this coating film prevents the particles of the granular material, which are easily affected by the magnetic field, from rising due to the magnetic field. Therefore, even when supplying a granular material mixed with iron powder, which is a ferromagnetic component, into the tubular body, the granular particle is not adsorbed to the edge surface of the tubular body which is magnetically poled during high frequency welding. Therefore, the cracking of the tube caused by the adsorption of the magnetic particles in the granular material on the edge surface of the tubular body is substantially eliminated.

[0014]

[Example] As the curable coating material of the present invention, various coating materials such as ultraviolet curing, heat curing, electron beam curing, etc. can be adopted, but in the following, a relatively simple system and a short curing time (hence the production line) The invention will be described with reference to an ultraviolet curable coating material (hereinafter referred to as a UV liquid) which is easy to incorporate into and has a high production speed.

As is well known, the UV liquid is composed of a photopolymerizable oligomer (prepolymer having a polymerizable double bond), a reactive diluent (photopolymerizable monomer), a photoinitiator, a pigment and other additives. It In the present invention, this is applied to the surface of the granular material and irradiated with ultraviolet rays (UV) to be cured. This UV curing is performed at a specific wavelength (250 to 400 n
UV by radiant energy of ultraviolet light (near ultraviolet) of m)
This is a radical polymerization reaction of a liquid, and when UV liquid is irradiated with ultraviolet rays, a photoinitiator absorbs it, excites it, and cleaves it to generate free radicals, and these free radicals react with oligomers and monomers to chain the polymerization. It grows and finally becomes a coating film (solid film) having a three-dimensional network structure. Since the coating film is formed in 1 second or less, there is no problem even if the time required from the supply of the powdery particles into the pipe to the high frequency welding is a short time of seconds. The coating film of the UV liquid thus formed on the surface of the granular material in the tube acts as a shielding film for the magnetic particles in the granular material which rises up by the magnetic field at the high frequency welding position and is magnetically attached to the edge surface of the tube.

An atomizing nozzle or a slit nozzle is used to apply the UV liquid to the powder or granular material in the tube. As the atomizing nozzle, an appropriate one such as an ultrasonic spray method or an air spray method is used. The ultrasonic spray method is a method that atomizes the liquid guided to the atomizing surface of the nozzle tip by applying ultrasonic vibration, and the air spray method is a method that uses negative air pressure to atomize. . Among them, in the air spray method, there is a risk of disturbing the powder and granules in the tube by the air flow ejected from the nozzle together with the atomizing liquid, so that the coating amount, coating speed, etc. are limited. On the other hand, the ultrasonic spraying method in which the atomized liquid soft-lands on the surface of the granular material does not have such a concern, and is advantageous when applied to the present invention. Further, the slit nozzle is provided with a slit extending in a direction perpendicular to the traveling direction of the tubular body. The UV liquid flowing out from the slit forms a curtain of a thin liquid film and is supplied to the surface of the granular material.

The surface of the granular material in the tube is as flat as possible and has a horizontal surface (or curved surface).
It is desirable for forming a coating film of V liquid. For that purpose, it is important to make the surface layer of the granular material fine particles and to supply the granular material into the pipe so that the surface of the granular material becomes a horizontal surface (or a curved surface). That is, if the surface of the granular material is coarse, the UV liquid easily penetrates between the particles of the granular material, and if the surface of the granular material is wavy or inclined, the surface area covered by the UV liquid film increases. Moreover, the film thickness becomes uneven. As a result, there appears a portion where the connecting force between the particles is insufficient, so that when the pipe passes through the magnetic field generated by high-frequency welding, the coating film at this portion may be destroyed and the magnetic particles may fly up. In order to solve this problem, increasing the coating amount of the UV liquid is uneconomical and inefficient, and moreover, a predetermined amount of the UV liquid which is an organic substance (main constituent element: C, H, O) is used. It is not a recommended treatment because the addition in excess may cause a defect in the subsequent manufacturing process or may deteriorate the product quality of the manufactured powder / granular material-filled pipe. From this point of view, it is recommended that the upper limit of the particle size of the powder or granules to be supplied into the tube, at least the powder or granules in the surface layer portion forming the bed layer of the UV coating film is 500 μm or less, preferably 300 μm or less.

The curing of the UV liquid applied to the surface of the granular material in the tube is caused by irradiation of ultraviolet rays. The ultraviolet irradiation device (hereinafter referred to as UV irradiation device) is composed of a lamp (mercury lamp, electrodeless discharge lamp, xenon flash lamp, etc.) that generates an effective ultraviolet spectrum, a reflector, a shutter, a power supply device, a cooling device, etc. . The ultraviolet lamp is arranged on the downstream side of the UV liquid coating device and along the upper side of the opening of the running tube, and the ultraviolet light emitted from the lamp enters the tube through the opening of the tube and irradiates the entire surface of the granular material. ing.

The production of a flux-cored wire for welding will be described below as an example. FIG. 1 ((b) is continuous with (a)) is a configuration diagram of a main part of a flux-cored wire manufacturing apparatus for welding.

As shown in FIGS. 1 (a) and 1 (b), a preforming roll, a forming roll group (not shown), a side roll 2, and a flux supplying device 3 are provided along the feed direction of the open pipe (tubular body) 1. Are arranged. First, the flux 4 is supplied from the flux supply device 3 into the open tube 1 in the middle of molding. The open pipe 1 supplied with the flux 4 passes through the fin pass roll 5 and the seam guide roll 6 and enters the welding zone. The high frequency induction welding device 7 has a work coil 8
And a squeeze roll 9. Work coil 8
A high-frequency current is supplied from the power supply 10 to the. The welded pipe 11 has an extra bead on the outer surface side cut by a cutting tool (not shown) (the inner bead remains in the pipe), is rolled by a rolling roll group 12, and is further annealed, followed by a rolling device and a wire drawing device. (Neither is shown) The diameter is reduced to a product size of about 1.0 to 2.0 mm.

The manufacturing apparatus for carrying out the method of the present invention is the wire manufacturing apparatus as described above, and further, an appropriate position between the flux supplying device 3 and the high frequency induction welding device 7, that is, the flux supplying device 3 in this embodiment. A UV liquid applying device 13 and a UV irradiating device 14 are provided between the fin pass rolls 5 via the side rolls 2.

1 (a) and 3 (III-II in FIG. 1 (a))
As shown in the cross-sectional view (I line), the UV liquid application device 13 includes an atomizing nozzle 15, an ultrasonic power supply 16, a compressor 17, an air pressure controller 18, a UV liquid tank 19, a flow rate adjusting valve 20, an operating valve 21, and the like. To be done. When the inside of the UV liquid tank 19 is pressurized by the compressor 17 and the air pressure controller 18, the UV liquid in the UV tank 19 reaches the atomizing nozzle 15 via the flow rate adjusting valve 20 and the operate valve 21. On the other hand, the atomizing nozzle 15 is ultrasonically vibrated by the electric power supplied from the ultrasonic power supply 16, so that the atomizing nozzle 15 discharges U.
The V liquid is atomized and the surface of the flux 4 in the tube 1 is applied. The atomization nozzle 15 is adjusted in height and positioned so that the atomized UV liquid discharged from the tip (atomization surface) 22 of the atomization nozzle 15 covers the entire surface of the flux. The discharge amount of the UV liquid is adjusted by adjusting the air pressure in the UV liquid tank 19 by the air pressure controller 18 and the flow rate by the flow rate adjusting valve 20. Depending on the type of curable paint used, the atomization nozzle 15 may generate heat when atomized by an ultrasonic spray method. In this case, therefore, the atomization nozzle 15 should be appropriately adjusted so as to be below its heat resistance limit temperature. Nozzle cooling means is attached. In this example, since the atomizing nozzle 15 generates heat by atomizing the UV liquid, a nozzle cooling unit (not shown) is attached. Also in this example UV
Although the pressure feed pump system is adopted as the liquid supply system, other appropriate supply systems may be adopted as a matter of course.

As shown in FIGS. 1A and 4 (a sectional view taken along the line IV-IV in FIG. 1A), the UV irradiation device 14 includes a mercury lamp 23 for generating ultraviolet rays, a reflector 24, and a shutter (shown in the figure). No), lamp house 28 (air inlet 26, outlet 2
7), a power supply device 25, a cooling device (comprising a lamp house 28, a duct 29, and a blower 30), a gate-shaped support jig 31 that supports the lamp house 28, and the like. On the top surface of the support jig 31, the quartz glass 3 that blocks the cooling air flow flowing in the lamp house 28 at the ultraviolet ray passing position between the lamp 23 and the tube opening 33 of the open tube 1.
2 is arranged, and an opening / closing window (not shown) for adjusting the amount of ultraviolet rays (irradiation power) transmitted through the quartz glass 32 is arranged. The mercury lamp 23 in the lamp house 28 is arranged on the downstream side of the atomizing nozzle 15 for the UV liquid, and along the upper opening of the open tube 1 containing the flux 4 traveling in the gate shape of the supporting jig 31, Ultraviolet light emitted from the mercury lamp 23 enters the tube through the tube opening 33 and irradiates the entire flux surface. As a result, the UV liquid film applied to the surface of the flux in the tube is hardened to form a coating film. The hardness of the coating film is adjusted by increasing or decreasing the amount of ultraviolet rays emitted from the mercury lamp 23 (irradiation power).

In addition, FIG. 1 (a) and FIG. 2 (II in FIG. 1 (a))
As shown in the cross-sectional view taken along the line II), the flux supply device 3 supplies the flux 4 cut out from the flux hopper (not shown) to the electromagnetic feeder 34 that conveys the flux 4 above the tube opening 33, and the flux 4 that drops from the electromagnetic feeder 34. It is composed of a chute 35 and the like leading to the tube opening 33. Inside the chute 35, a baffle plate 36 having a variable opening angle is attached to the wall surface of the chute in a zigzag shape for adjusting the left-right balance of the flux laminated state as viewed from the cross-sectional direction of the tube. Adjust the opening angle of this baffle plate 36 and supply into the pipe,
The surface of the flux 4 to be laminated is made to be a desired horizontal surface (or curved surface).

FIG. 5 (a) is an enlarged sectional view of the welding zone in FIG. 1 (b), and FIG. 5 (b) is a sectional view taken along line VV of FIG. 5 (a). As already mentioned, the work coil 8 is used in high frequency welding.
Since a magnetic field is generated in the open tube 1 by the high-frequency current flowing in the open edge surface 38 and the opening edge surface 38 serves as a magnetic pole, ferromagnetic particles (iron powder particles, iron powder-containing particles, etc.) present on the flux surface in the open tube 1 are attracted. Attempts to stick to the opening edge surface 38. In the present invention, a UV coating film 37 (more specifically, a cured flux film that covers the surfaces of the flux particles and is formed by connecting the flux particles with each other by the UV liquid that is interposed between the flux particles and hardened) is formed. Therefore, the shielding effect of the UV coating film 37 prevents the ferromagnetic particles (iron powder or the like) from adsorbing to the opening edge surface 38. On the other hand, conventionally, as shown in FIG. 6, the ferromagnetic particles 39 on the flux surface were attracted as they were by the magnetic force and soared to the opening edge surface 38.

Next, the result of cracking of the flux-cored wire for welding manufactured by the above apparatus will be described.

Usually, the width w = 30-by high frequency induction welding.
A steel strip having a thickness of 150 mm and a thickness of t = 1 to 5 mm has an outer diameter do = 1
Welding conditions for producing pipes of 0 to 50 mm are as follows: frequency of high frequency current f = 300 to 800 kHz Heat input (EpIp) P = 50 to 500 kVA, welding speed (pipe forming speed) V = 10
Pipe forming is performed at a speed of about 100 m / min.

Here, a steel strip (SPHC) having a plate thickness of 2.5 mm and a width of 75.0 mm was formed into a pipe having an outer diameter of 25.5 mm and an inner diameter of 20.5 mm. Flux was supplied into the tube during molding. Subsequently, a UV liquid was discharged from an atomizing nozzle to apply it on the flux surface, and was irradiated with ultraviolet rays to be cured to form a UV coating film. After that, the open pipes were continuously butt-joined. At this time, the frequency of the high frequency current supplied to the work coil was 500 kHz, the amount of heat input (EpIp) P = 160 kVA, and the welding speed V was 35 m / min. Welded outer diameter 25.5
mm tube is subjected to continuous annealing once with rolling rolls to reduce the outer diameter to 4.0 mm, and heat treatment (700 ° C x 5) for annealing the tube shell and dehydrogenating the filling flux.
Min), plating treatment was applied, and the coil was wound. Then, finish wire drawing was performed with a combination of a roller die and a hole die, and the diameter of the product was reduced to a product size of 1.2 mm, and the occurrence of cracks in the product wire was examined.

The flux used was prepared by mixing and granulating the raw material powders shown in Table 1 (adhesive: water glass) and classifying (sieving method) to a predetermined particle size, 500 μm to Dust (opening of 500 μm [32 mesh]). Min) ・ ・ ・ F-1 300μm ~ Dust (under sieve of 300μm [48mesh]) F-2,3,4 212μm ~ Dust (under sieve of 212μm [65mesh]) ... F-5,6 Was a granulated powder (iron powder content rate: 5 to 30 wt%). The flux filling rate was 12 to 17%.

[0030]

[Table 1]

The UV liquid used was an acrylic ester-based paint (specific gravity = 1.1 [20 ° C.]), and the UV liquid flux addition rate (= (UV liquid coating amount / flux supply amount) × 10)
(0%) was set to 0.14%, and the UV liquid application amount was set to 10 to 15 g / min in accordance with the iron powder content (= 5 to 30 wt%). The coating amount (weight speed) of the UV liquid is converted into the coating amount per unit area of flux and the film thickness as follows.

[Amount of UV liquid applied] [Amount applied per unit area and film thickness] 10 g / min → 1.0 mg /, 9 μm ... F-1 11 g / min → 1.1 mg /, 10 μm ... F -2 12 g / min → 1.2 mg /, 11 μm… F-3 13 g / min → 1.3 mg /, 12 μm… F-4 14 g / min → 1.4 mg /, 13 μm… F-5 15 g / min → 1.5 mg /, 14 μm ... F-6 However, the film thickness is the value when it is assumed that the coating is on an ideal plane. In practice, the UV liquid also penetrates between the particles. A UV film having a uniform thickness is not formed.
The UV irradiation power was 6 kW.

[0033]

[Table 2]

For the evaluation of cracks, the presence or absence of cracks was confirmed by conducting an eddy current flaw detection test (ECT) on the wire sheath over the entire length of 100 km of the product wire having an outer diameter of 1.2 after wire drawing (spool of 20 kg of wire × 37). When the presence of cracks could not be confirmed at all, this was regarded as good (◯). Also, if there is a crack, the treatment liquid tends to infiltrate into the wire during surface treatment or wire drawing from the opening of the crack and deteriorate the quality of the product. This was regarded as a defect (x).

In Table 2, Experiment Nos. 1 to 6 are experimental examples of the present invention. Experiment No. 1 ... Iron powder content: 5%, filling rate: 12%, particle size: 500 μm ~ U on the flux (F-1) surface of Dust
Solution V was applied at an application amount of 10 g / min. Experiment No. 2 ... Iron powder content: 10%, filling rate: 13%, particle size: 300 μm ~ U on the flux (F-2) surface of Dust
Solution V was applied at an application amount of 11 g / min. Experiment No. 3 ... Iron powder content: 15%, filling rate: 14%, particle size: 300 μm ~ U on the flux (F-3) surface of Dust
The solution V was applied at an application amount of 12 g / min. Experiment No. 4 ... Iron powder content rate: 20%, filling rate: 15%, particle size: 300 μm ~ U on the flux (F-4) surface of Dust
Solution V was applied at an application amount of 13 g / min. Experiment No. 5 ... Iron powder content rate: 25%, filling rate: 16%, grain size: 212 μm ~ U on the flux (F-5) surface of Dust
Solution V was applied at an application amount of 14 g / min. Experiment No. 6 ... Iron powder content rate: 30%, filling rate: 17%, particle size: 212 μm ~ U on flux (F-6) surface of Dust
Solution V was applied at an application amount of 15 g / min. In these experimental examples, a UV coating film is formed on the flux surface. This UV coating shields the flux particles from rising due to the magnetic field generated in the tube, so that cracking of the tube skin due to adsorption of the flux particles on the tube edge surface did not occur. The flux having a higher iron powder content has a finer grain size to facilitate formation of a good UV coating film, and the coating amount of the UV liquid is increased to enhance the shielding power. When welding was performed using this flux-cored wire for welding, good welding workability was realized.

On the other hand, Experiment No. 7 is a comparative example, and no UV coating film was formed on the flux surface.
Therefore, the flux particles in the surface layer of the flux (iron powder or granulated particles containing iron powder) were directly affected by the magnetic field generated in the tube and soared to the edge surface of the tube.
As a result, cracks frequently occurred on the tube skin and the product yield was lowered, so that it was practically impossible to manufacture. In Experiment No. 7, iron powder content: 5
% Flux (F-1) was used, of course, the same applies to the iron powder content rate: 10 to 30% flux (F-2 to 6), and the higher the iron powder content rate, the more the occurrence rate of cracks in the tube skin. Is high.

FIG. 7 (a) shows another example of the UV liquid supply system. The supply device of this example is an open type UV liquid tank 40, a diaphragm pump 41, a first return pipe 42 and a first open / close cock 42c, a liquid regulator 43, a first operate valve 44, a second return pipe 45 and a second open / close cock 45c. ,
A liquid route system including a second operate valve 46 and the like, a compressor 47, an air pressure regulator (electro-pneumatic converter) 4
8, a three-way valve 49 and other pneumatic system, a flow meter 50, a controller 51, a pneumatic regulator 48 and other flow control system. The UV liquid sucked up from the tank 40 by the diaphragm pump 41 passes through the liquid regulator 43 and the first operate valve 44, and then the atomizing nozzle 15
To reach. The controller 51 controls the flow rate of the UV liquid. That is, when the flow rate value measured by the flow meter 50 deviates from the preset flow rate value input to the controller 51 in advance, a control signal that causes the difference to be 0 is sent to the air pressure regulator 48, and the air pressure regulator 48 which receives the control signal changes the air pressure. It is increased or decreased to adjust the opening degree of the liquid regulator 43. Three-way valve 4 for turning on and off UV liquid discharge
9 cooks. 7 (a) and (b) (see FIG.
As shown in (a) (VII-VII line sectional view), a sled plate 51 is provided between the flux supply device 3 and the atomizing nozzle 15, and the surface of the flux supplied into the open pipe 1 by this sled plate 51. May be evened out to make it easier to form a UV coating film.

[0038]

According to the present invention, powder particles are supplied to the tubular body while the metal strip is formed into the tubular body, both edge surfaces of the tubular body are joined by high frequency welding, and the powder particles are filled. In a method for manufacturing a powder-filled tube for reducing the diameter of a welded tube, a curable paint is atomized on the surface of the powder supplied to the tubular body prior to high-frequency welding of both edge surfaces of the tubular body. Is applied, and a film-like cured film (coating film) is formed by a curing treatment. Even when supplying a granular material containing a ferromagnetic component such as iron powder into the tubular body due to the shielding effect of this coating film formed on the surface of the granular material, the granular particles soar by the magnetic field during high frequency welding There is no risk of sticking to the edge surface of the tubular body. Therefore, the cracking of the tube due to this adsorption is substantially eliminated. As a result, the product yield can be improved, and a powder-filled tube with good quality can be obtained.

[Brief description of drawings]

FIG. 1 shows an example of an apparatus for manufacturing a powder / particle filling tube of the present invention, and is a configuration diagram of a main part of a welding flux-cored wire manufacturing apparatus.

FIG. 2 is a sectional view taken along line II-II of FIG. 1, showing a state of flux supply by a flux supply device.

3 is a sectional view taken along the line III-III in FIG. 1, showing a coating state diagram by an atomizing nozzle of a UV liquid coating apparatus.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 1, showing a UV irradiation device.
The installation state figure of (lamp house) is shown.

5A is an enlarged sectional view of FIG. 1 in a welding zone (work coil position). (b) is a sectional view taken along the line V-V of (a), showing a sectional view of the tubular body at the work coil position of the present invention.

FIG. 6 shows a cross-sectional view of the tubular body in the prior art work coil position.

FIG. 7A is a configuration diagram showing another embodiment of the UV liquid supply system. (b) is a sectional view taken along line VII-VII of (a) and shows a sectional view of the tubular body.

[Explanation of symbols]

1 Open Pipe (Tubular Body) 2 Side Roll 3 Flux Supply Device 4 Flux 5 Fin Pass Roll 6 Seam Guide Roll 7 High Frequency Induction Welding Device 8 Work Coil 9 Squeeze Roll 10 Power Supply 11 Welded Pipe 12 Rolling Roll Group 13 UV Liquid Application Device 14 UV irradiation device 15 Atomizing nozzle 16 Ultrasonic power supply 17 Compressor 18 Air pressure controller 19 UV liquid tank 23 Mercury lamp 24 Reflector (mirror) 25 UV power supply 28 Lamp house 30 Blower 31 Lamp house support jig 32 Quartz glass 33 Tube Opening 34 Electromagnetic Feeder 35 Chute 37 UV Coating Formed on Flux Surface 38 Opening Edge Surface 39 Ferromagnetic Particles (Flux Particles) Soaring by Magnetic Field 40 Open UV Liquid Tank 41 Diaphragm Pond 42 42 1st return pipe 43 Liquid regulator 44 1st operate valve 45 2nd return pipe 46 2nd operate valve 47 Compressor 48 Air pressure regulator (electro-pneumatic converter) 49 Three-way valve 50 Flowmeter 51 Controller

Claims (4)

[Claims] 1. A powdery or granular material is supplied into a tubular body during the forming of a metal strip into a tubular body, both edge surfaces of the tubular body are joined by high frequency welding, and a welded tube filled with the granular material is compressed. In the method for manufacturing a powder-filled tube having a diameter, characterized in that both edge surfaces of the tubular body are joined by high-frequency welding after a curable coating is applied to the surface of the granular material supplied into the tubular body to form a cured film. And a method for manufacturing a powder-filled tube. 2. The method for producing a powder-filled tube according to claim 1, wherein the curable paint is an ultraviolet curable paint. 3. The method for manufacturing a powder / granule-filled tube according to claim 1, wherein the curable coating material is applied to the surface of the powder / granular material by an atomizing nozzle. 4. The method for manufacturing a powder-filled tube according to claim 1, wherein the particle size of the powder is 300 μm or less.