JPH03169499A - Manufacture of granular body filling pipe and its device - Google Patents

Abstract

PURPOSE:To improve working efficiency of manufacture of a granular body filling pipe and its yield by sucking spatters in the vicinity of a welding point by a suction pipe extending in a void and discharging the spatters to the pipe outside at the upstream side from the welding point. CONSTITUTION:A metal plate is fed in the longitudinal direction and granular bodies (fluxes) 5 are supplied to the inside of the pipe 1 leaving the void along a pipe 1 till attaining the welding point 7. The metal plate is then formed into a pipe and the edge faces 3 of a groove 2 extending in the longitudinal direction of the pipe are welded to manufacture the granular body filling pipe. The spatters are then sucked from a spatter suction port 28 in the vicinity of the welding point 7 by the suction pipe 25 extending along the pipe 1 in the void and the spatters are contained in a collection tank 21 and discharged to the outside of the pipe 1 at the upstream side from the welding point 7. By this method, when the pipe which is filled with the granular bodies is drawn, breaking of the pipe can be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method and apparatus for manufacturing a powder-filled tube in which a metal tube such as carbon steel, stainless steel, copper alloy, aluminum alloy, etc. is filled with powder. Regarding. Here, the granular material refers to a powder, granular material, or a mixture of powder and granular material such as welding black or oxide superconducting material.

The present invention is utilized for manufacturing flux-cored wires for welding, oxide superconducting material-cored wires, and other powder-filled tubes.

[Prior Art] A flux-cored seamless wire for welding is one of the powder-filled pipes. In manufacturing this seamless wire, a cold-rolled hoop is slit to a required width, and the hoop after slitting is gradually formed from a U-shape to an O-shape using forming rolls. During this molding, flux is supplied to the hoop valley by a feeder from an opening along the longitudinal direction of the U-shaped hoop. Next, while forming it into an O-shape, the opposing edge surfaces of the opening are joined by welding, and then!
lI! diameter. Furthermore, after annealing if necessary, the tube filled with flux is drawn to a desired diameter and wound to form a product.

High-frequency induction welding or high-frequency resistance welding is widely used as a welding method in manufacturing the powder-filled tube. In either of these welding methods, after forming into a substantially O-shape, the edge surface of the opening is heated to a melting temperature by induction or resistance heating using a high-frequency current, and the opposing edge surfaces are pressed together with a pair of squeeze rolls.

By the way, in manufacturing the above-mentioned powder-filled tube, when welding the edge surface, there is a risk that the heat generated by welding may alter the quality of the powder. In addition, the magnetic field generated by the high-frequency current winds up the powder material. As a result, there is a problem in that the scattered powder adheres to the edge surface of the opening and gets caught up in the welded joint, resulting in a welding defect.

As a solution to such problems, Japanese Patent Application Laid-open No. 5←l0
``Method of manufacturing a tube filled with powder'' disclosed in Japanese Patent No. 9040 is known. The technology disclosed in this publication is to supply granular material into a pipe so that it does not fill the entire pipe when welding the pipe, thereby preventing deterioration of the granular material due to heat and the rolling up of the granular material. .

[Problems to be Solved by the Invention] However, the above conventional technology has the following problems. That is, the spatter generated during welding was mixed into the powder filled in the pipe. When drawing a pipe filled with granular material mixed with slatter to a desired diameter in a post-process, wire breakage was induced, resulting in a decrease in work efficiency and product yield. This wire breakage becomes more noticeable as the degree of wire drawing increases.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a method and apparatus for manufacturing a tube filled with powder and granular material, which prevents splatter from being mixed into the granular material to be filled.

[Means for Solving the Problems] The method for manufacturing a powder-filled tube of the present invention involves feeding a metal plate in the longitudinal direction and leaving a gap along the tube at least up to the welding point. A metal plate is formed into a tube while supplying powder and granules, and opposing edge surfaces of an opening extending along the length of the tube are welded. In the manufacturing process, slatter is sucked in near the welding point by a suction pipe extending along the pipe through the gap, and the slatter is discharged out of the pipe on the upstream side of the welding point.

A vacuum pump is used to suction the sludge. The slatter is sucked in the vicinity of the welding point, that is, in a region extending from upstream to downstream of the welding point, in a region having the width of an upstream or downstream region of the welding point, or at a point within these regions.

A device that feeds a metal plate into a tube shape while feeding it in the longitudinal direction, a device that supplies powder and granules into the tube while leaving a gap along the tube at least up to the welding point, and a device that feeds powder and granules into the tube while leaving a gap along the tube at least up to the welding point. A welding device is provided for joining opposing edge surfaces of the extending opening.

A suction tube that extends along the tube in the gap and has a suction section near the welding point, and a suction bomb connected to the suction tube are provided.

As the welding device, a high frequency induction welding device, a high frequency resistance welding device, and other devices are used. The outer diameter of the suction tube is about 30 to 90 times smaller than the height of the gap in the tube into which the granular material is supplied.

Since the tip of the suction tube where the suction part is formed is exposed to welding heat, it is preferably made of a heat-resistant material such as alumina, silicon carbide, silicon nitride, or the like. The tip of the suction tube may be a replaceable tip. As the suction bomb, a positive displacement type, centrifugal type, or ejector type vacuum pump is used. Note that the suction portion of the suction tube may be shaped so as to open toward the vicinity of the welding point. Near welding point 11w +-
＋ One post -r song r1 -to tsu ``Sugi
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It is formed by cutting out approximately a semi-circumference (located near the welding point) along the longitudinal direction of the pipe.

[Operation] Air is sucked near the welding point by the tip of the suction tube that extends along the inside of the tube. The spatter generated by welding is
It is drawn in by the suctioned air, carried inside the suction pipe, and discharged outside the pipe on the upstream side. Therefore, spatter will not be mixed in with the particles in the pipe.

[Example] Hereinafter, production of a flux-cored seamless wire for welding will be described as an example.

FIG. 1 is a configuration diagram of the main parts of the wire manufacturing apparatus.

As shown in FIG. 1, along the feeding direction of the tube 1, a forming roll group I1, a seam guide 14, a high frequency induction welding device 15
, and a diameter-reducing roll group l9 are arranged in sequence. A flux supply device 12 is arranged between the forming rolls 1l. The high frequency induction welding device 15 includes a work coil I6 and a squeeze roll 17. work coil l
6 has a power supply (not shown) of 400 to 600 k}I
A zO high frequency welding current is supplied. All of these devices are already installed.

The wire manufacturing apparatus is equipped with a collection tank 2l, and a centrifugal vacuum bomb 2 is connected to the top of the collection tank 21 via a solenoid valve 22.
3 is installed. When expressing the suction power in terms of the degree of vacuum inside the collection tank, it is, for example, 1000 to 1600 mln.
It is Aq. Further, a suction pipe 25 made of a steel pipe is attached to the cylindrical portion of the collection tank 21 . The suction tube 25 enters into the tube from the opening 2 of the tube 1 in the middle of molding, and extends along the feeding direction of the tube 1 to near the seam guide 14.

In this example, the outer diameter of the suction tube 25 is 10 aoo, and the inner diameter is 6III1.

An alumina suction tip 26 is attached to the tip of the suction tube 25. As shown in FIG. 2, a spatter suction port 28 is formed near the tip of the cylindrical tip body 27 and opens over a semicircumference. In this embodiment, the outer diameter of the suction tip 26 is 1 Omm, and the inner diameter is 6III11
The length of the suction mouth 28 is 100 mm.

As the pipe 1 is welded, spatter occurs near the welding point 7. By driving the vacuum bomb 23, the splatter is sucked into the slatter suction port 28 of the suction tip 26, and collected in the collection tank 2l via the suction pipe 25. Therefore, spatter is prevented from being mixed into the flux in the tube I.

Here, the results of manufacturing a flux-cored wire for welding manufactured using the apparatus configured as described above will be explained.

A steel hoop material was formed into a tube with an outer diameter of 25.4 mm and an inner diameter of 21.4 mm. Flux was filled at a filling rate of 12% during the shaping process. The welding conditions are shown in Table 1. In addition, the degree of vacuum is 120
Suction near the welding point at 0 to 1400 mmAq (value in collection tank) and suction amount 30 to 5017 min,
Collected grasshoppers. The welded pipe is reduced to an outer diameter of 1 1 by diameter reduction roll group +9. The diameter was reduced to 5+n+n and wound into a coil. Then, in a separate wire drawing process, 33 dies are used to reduce the outer diameter to 1. Up to 2mm, final drawing speed 1000m
The wire was drawn at a speed of /min.

The wire drawing results are shown in Table I. As is clear from Table 1,
When spatter is not sucked and collected (Reference example: No. 1
．． 3, 5, 7.9), wire breakage occurs during wire drawing.

This is due to the sludge mixed into the flux inside the pipe. On the other hand, when spatter is sucked and collected, no wire breakage occurs during wire drawing.

Table 2 shows the sorrel ivy (diameter 0.2~
0.6 mm). In addition, Table 2 shows that when suction and collection are not performed, the weight, l of the slatter remaining in the flux in the 2500 kg flux-cored wire (since the filling rate is 12%, the flux weight is 300 kg) (diameter 0 .2 to Q.6 mm) are also shown. As is clear from Table 2, as the welding speed becomes slower, sputtering becomes more intense and the occurrence of spatter increases. Furthermore, it is presumed that most of the slobber scattered inside the pipe is sucked up and captured.

Table 2 Figures 3 to 7 each show other examples of suction tips.

In the suction tip 3 shown in FIG. 3, the tip body 32 has a cylindrical shape as a whole, and the tip end forms a sputter suction hole 33 perpendicular to the sleeve of the tip. The suction tip 35 shown in FIG. 4 has a sloping suction hole 37 at the tip of a cylindrical tip body 36 that is inclined with respect to the sleeve of the sleeve. These suction tips 31 , 35 are attached to the suction tube 25 so that the suction holes 33 , 37 are located near the welding point 7 .

The suction tip 39 shown in FIG. 5 is provided with a spatter suction port 4l extending along the longitudinal direction at the center of the tip body 40 and opening upward. The sucker tip 39 is
The longitudinal center of the spatter suction port 4l is approximately the welding point 7.
It is attached to the suction tube 25 so as to be located at .

The tip body 44 of the suction tip 43 shown in FIG. 6 is the same as that shown in FIG. 1, but as shown in FIG. The spatter capturing blade 46 is inclined toward the sputter suction port 45 and closes the gap between the tube inner wall and the chip body 44. Spatter falling from the welding part is caught by the spatter catching blade 46, guided by the blade surface, falls into the spatter suction port 45, and is sucked into the suction pipe 25. Further, since the spatter capturing blade 46 closes the gap between the tube inner wall and the chip body 44, it also serves as a spatter shielding plate. This prevents the slatter from falling and getting mixed into the flux 5 at the bottom of the tube.

Here, another example of a manufacturing apparatus for a flux-cored seamless wire for welding will be described.

FIG. 8 is a configuration diagram of the main parts of the wire manufacturing device, and FIG.
The figure is a detailed view of the vicinity of the pipe welding device. In these drawings, devices or members similar to those shown in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted.

As shown in FIGS. 8 and 9, the wire production line is tilted forward at an angle of repose L of the flux (60 degrees in this example). Forming roll group 11. The seam guide 14 and the high frequency induction welding device 15 are sequentially arranged along the inclined wire production line. The flux supply device 12 is equipped with a quartz Franks supply pipe 5l, and the flux supply pipe 5l is inserted into the pipe from between the forming rolls 11 through the opening 2 of the pipe 1 in the middle of forming. The tip of the flux supply pipe 51 is located downstream of the welding point 7. The suction tube 25 enters the tube downstream of the insertion position of the flux supply tube 51 into the tube, and extends along the feeding direction of the tube 1 to near the seam guide 14 . An alumina suction tip 55 is attached to the tip of the suction tube 25.
is installed. As shown in FIG. 10, the suction tip 55 includes a tip body 56 in the shape of a semicircular box. The chip body 56 has a sputter suction port 57 that opens upward, and a connecting pipe 59 is fixed near the bottom. The connecting tube 59 extends to near the sputter receiver 58 at the tip of the chip body, and its rear end is connected to the tip of the suction tube 25.

Note that a pressurized gas (for example, argon, helium, nitrogen gas, carbon dioxide, air, etc.) may be supplied into the flux supply pipe 51 to assist the flow of the flux 5 within the flux supply pipe 5l.

Also, in the example shown in FIG. 8, the flux may not be used as in the example shown in FIG. 1, and the flux may be directly supplied from the brax supply device to the tube through the opening of the tube during the forming process. . In this case, the flux enters the inside of the tube while sliding along the bottom surface of the tube.

[Effects of the Invention] According to this invention, the spatter generated by welding is drawn in together with the suctioned air, carried inside the suction pipe, and emitted outside the pipe on the upstream side. Therefore, spatter will not be mixed into the powder inside the tube. As a result, there is no breakage of the tube when drawing the tube filled with powder and granule, and it is possible to improve the working efficiency and yield in manufacturing the tube filled with powder and granule.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention; FIG. 2 is a perspective view of a suction tip attached to the device shown in FIG. 1; FIG. Figures 3 to 6 are perspective views showing other examples of the suction tip, Figure 7 is a front view showing the suction tip shown in Figure 6 inserted into a tube being manufactured, and Figure 8 is a perspective view showing other examples of the suction tip. 9 is a detailed diagram of the vicinity of the pipe welding device installed in the wire manufacturing device shown in FIG. 8, and FIG. 10 is a diagram showing the main parts of the device. FIG. 3 is an enlarged perspective view of a suction tip provided in the device shown in the figure. 1... Pipe, 2... Opening of the tube during the forming process, 3...
- Edge surface of opening, 5... Flux, 7... Welding point, l1... Forming roll group, 12... Flux supply device, 14... Seam guide, 15... High frequency induction welding device , l6... Work coil, l7... Squeeze roll, l9... Diameter reducing roll group, 21... Collection tank, 23... Vacuum bomb, 25... Suction pipe, 2
6, 31, 35, 39, 43.55 - Suction tip, 28, 41, 45.57... Splatter suction port, 33
．． 37... Splatter suction hole, 46... Splatter capturing blade, 5I... Flux supply pipe.

Claims (1)

[Claims] 1. The metal plate is fed in the longitudinal direction of the metal plate, and the metal plate is shaped into a tube while supplying powder and granules into the tube so as to leave gaps along the tube at least up to the welding point. In a method of manufacturing a powder-filled tube by forming and welding opposing edge surfaces of an opening extending along the longitudinal direction of the tube, spatter is sucked in the vicinity of the welding point by a suction tube extending along the tube through the gap. A method for manufacturing a powder-filled tube, characterized in that spatter is discharged to the outside of the tube on the upstream side of the welding point. 2. A device for forming a metal plate into a tube while feeding it in the longitudinal direction, a device for feeding powder into the tube so as to leave a gap along the tube at least up to the welding point, and a device for feeding powder into the tube in the longitudinal direction. A device comprising a welding device for joining opposing edge surfaces of an opening extending along the pipe, the suction pipe extending along the pipe in the gap and having a suction portion near the welding point, and the suction pipe connected to the suction pipe. A manufacturing device for a powder filling tube, characterized by being equipped with a pump. 3. The apparatus for manufacturing a powder-filled tube according to claim 2, wherein the suction portion of the suction tube opens toward the vicinity of the welding point.