JPH03138099A - Bead removing device - Google Patents

Abstract

PURPOSE:To easily and surely improve bead removing work by providing the bead removing device constituted of a weld bead melting part and a slag removing part on a high-frequency resistance welding manufacturing line of section steel. CONSTITUTION:The bead removing device is constituted of the bead melting part 5 to melt a bead generated at the time of welding work and the slag removing part 7 by a brush set up at a rear stage thereof. The bead melting part 5 is provided with pretreatment equipment 8 for cooling welded section steel, a guide part 9, a mist spraying part 10 and a dust collecting part 11 and the slag removing part 7 is provided with a cleaning device 12 and a scale and flash collecting part 13. By this method, bead removing work can be easily and surely carried out without variance and without being influenced by a bead shape and a bead heat valve by melting positively the bead on the bead molting part 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a welded H manufactured by high frequency resistance welding.
The present invention relates to a removing device that removes beads generated between a web and a flange during the production of shaped steel such as shaped steel.

[Prior Art] As a conventional bead removal device of this type, one is known that blows oxygen to the bead while it is heated immediately after welding, and uses an oxidation reaction and oxygen pressure to solvent the bead. (Refer to Japanese Utility Model Application Publication No. 54-100926) Note that this conventional bead removal device uses a rail 32 installed above the exit side of a high-frequency induction welding machine 31 as shown in FIG.
A truck 33 that runs above, a pair of arm rods 35 suspended to sandwich the M@34 formed by welding to the truck 33 with a high-frequency induction welding machine 31, and a pair of arm rods 35 on each arm rod 35. The oxygen blower consists of a nozzle 36 that is movable up and down and swingable so as to be able to face the bead portion of the shaped steel 34.

[Problems to be solved by this invention]

However, in such a conventional removal device, the bead is burned as a solvent by oxygen spraying, so the nozzle 36 is installed at a position where the bead is in a high temperature range.
That is, it is necessary to perform the welding near the welding position to the H-shaped steel 34.

In addition, for this oxygen spraying, the nozzle 36 needs to be installed from the outlet side to the inlet side of the line flow in the production line of the welded H-shaped steel 34, so the installation location of the nozzle 36 is determined. .

If the oxygen spray nozzle 36 is installed only in the vicinity of the welding position, the oxidized slag generated when the bead solvent is applied to the web support roll 37 and the web 38 and flange 39 during welding. The particles scatter onto the contact portion 40 of the roller 37 and cause the contact portion 40 to get caught.

In addition, since the bead is dissolved in the vicinity of the welding position to the HY3 steel 34, the shape of the bead, which is a control index for welding quality, becomes unclear.

Furthermore, the bead itself that is generated when welding to the H-section steel 34 always has a wavy shape and changes in size, and the amount of heat in the bead changes depending on the line speed, which causes variations in the oxidation reaction and the solvent This will cause variations in the depth, such as becoming shallower or deeper.

This invention was devised in view of the above-mentioned circumstances, and its purpose is to have no effect on the welding work of section steel without limiting the installation location, and to be influenced by the bead shape and bead heat amount. To provide a bead removal device which can surely remove beads without causing any damage.

[Means for Solving the Problems] According to the device of the present invention, a production line for section steel is comprised of a bead melting section for melting beads generated during welding work, and a brush installed after the bead melting section. A bead removal device for welded H-section steel is installed, which is equipped with a slag removal section.

The bead removal device also includes a pretreatment facility for cooling the welded shaped steel provided upstream of the bead melting section, a guide section for stabilizing the feeding shape of the shaped steel, and a guide section provided upstream of the bead melting section. A mist spraying part forms a water film on the surface of the shaped steel, a dust collection part prevents dust from scattering during bead melting cutting at the bead melting part, and each of the generated beads is located close to each other. The present invention includes the bead melting section capable of melting the bead, a cleaning device provided downstream of the slag removal section, and a collection section collecting and discharging scale flash generated during bead melting and cutting.

By actively melting the bead at the bead melting part, removal work can be performed without being affected by the bead shape and bead heat amount.

In addition, since the bead is actively melted at the melted part, the bead can be removed in a cold region, making it possible to remove the bead at a position further away from the welded part to the section steel. To surely remove beads without being affected by scattering of oxidized slag, etc.

Furthermore, by melting and cutting each generated bead at a close position, the uncut area at the start of the melt-cutting operation can be reduced (which is advantageous in terms of yield). Since the constraint range is narrow and the guide device can be made into a cylindrical structure, the dust collection range can be consolidated, so the dust collection capacity can also be reduced.

In addition, the pretreatment equipment and mist spraying section reduce the adhesion of NOx and scale in the bead melting section, making it easier to remove them, making it possible to simplify the structure of the slag removal section and cleaning device. It is something.

〔Example〕

The bead removal device of the present invention will be described below with reference to an embodiment in which it is installed for removing beads during the production of welded H-section steel. (See Figures 1 to 5) A bead removal device 1 placed on the production line for welded H-shaped steel 2 is provided at a certain distance from the high-frequency resistance welded part 3 that forms welded H-shaped steel m2. It is equipped with a bead melting section 5 for melting beads 4 generated during welding work for forming steel sections, and a slag removal section 7 consisting of a brush 6 installed after the bead melting section 5. .

The bead removing device 1 includes a pretreatment facility 8 for cooling the welded shaped steel provided upstream of the bead melting section 5, a guide section 9 for stabilizing the feeding shape of the shaped steel 2, and a guide section 9 for stabilizing the feeding shape of the shaped steel 2. A mist spraying section IO that is provided at the front stage and forms a water film on the surface of the shaped steel 2, a dust collecting section 11 that prevents dust from scattering during bead melting cutting in the bead melting section 5; A bead melting section 5 that can melt generated beads 4 at a nearby position, a cleaning section 12 provided after the slag removal section 7, and a collection section that collects and discharges scale and flash generated during bead melting cutting. Part 1
3.

The pre-treatment equipment 8 is provided with water cooling, since the shaped steel 2 is hot (300 to 400°C) after welding is completed, and if it is melted and cut in this state, the adhesion of molten slag will be strong and it will be difficult to remove the slag. The temperature of the shaped steel 2 is lowered (below 100°C). Furthermore, if a large amount of water remains in the bead at this time, the cut shape will deteriorate, so the water is removed by air blowing.

The mist spraying section 10 is installed upstream of the bead melting section 5, and forms a water film (mist) on the surface of the shaped steel 2 after the water removal in the pre-treatment facility (IIF8) is completed. The film (mist) is NOx generated during melt cutting with the plasma torch 5a of the bead melting part 5, which will be described later.
, to reduce the adhesion of scale to the shaped steel 2 and to facilitate post-treatment. However, if the amount of water is too large, the bead cutting shape will deteriorate.

The dust collection section 11 is installed before the bead melting section 5, and is composed of a dust collection hood that collects and discharges NOx generated by the plasma torch 5a. In addition, inside this dust collection hood, there is a partition plate 11a (a chain, a steel plate, etc.) to prevent the flash from scattering, since the flash from the plasma torch 5a will scatter up to 4 to 5 meters.
is provided.

The bead melting section 5 consists of two plasma torches 5a, 5a that melt the upper and lower beads 4 that occur at the roots of the flanges 2a and web 2b of the H-section steel 2, and one dot according to the plasma torches 5a, 5a. It consists of an accompanying mechanism section (not shown) for performing melting work. The accompanying mechanisms include a follow-up roller for the melting section that maintains a constant distance from the wafer 2b and the flange 2a so that the bead 4 can be reliably melted, a power supply roller on the base material side, and a negative electrode on the torch side. , and a power supply section in which the positive terminal is connected to the power supply roller side on the base material side.

As the bead melting section 5 here, an arc welding machine, a laser, a gas cutting machine, or a plasma cutting machine can be used. Examples of the plasma cutting machine include gas plasma (air, oxygen, argon) and water plasma. Any of these can be used for melting, and if there are no problems with oxidation or deterioration of the bead removal surface, air plasma is better because of its low running costs, and gas plasma is the most efficient method. In the case of the welded H-section steel in this example, air plasma will be used. In addition, when using something other than plasma that does not use gas, such as plasma,
Since the molten material cannot be blown away, a blowing gas injection port is required near the molten part.

Further, both plasma tows 5a, 5a are arranged so that the upper and lower bead melting and cutting positions are approximately at the same position.

This is because if the melting and cutting positions of the upper and lower torches 5a, 5a are installed far apart from each other, the flash scattering range of the torches will be wide, so the guide portion 9. This is because the dust collecting section 11 needs to be placed further away from the dust collecting section 11, and thus a plurality of dust collecting sections are required. Therefore, both torches 5a,
It is desirable that the distance between 5a be as small as possible. Further, of the two plasma torches 5a, 5a, the one for melting and cutting the lower bead is placed on the inlet side of the shape 11I2, and the one for melting and cutting the upper bead is placed on the outlet side of the shape steel 2, respectively. Note that since the cutting shape changes greatly depending on the setting conditions of the plasma torch 5a, a rational equipment such as a robot is used for setting.

The guide section 9 includes a web guide roller 9a and a presser roll 9b. The web guide roller 9a is for guiding the nib center, which is a bead cutting center, and guides the vicinity of the flange 2a for stability. Also, presser roll 9b
is in contact with the flange 2a in order to suppress vertical movement of the shape fi12. The lower roll of the presser roll 9b in this guide part 9 also serves as a pass line, so it is made of a super hard alloy or the like with low friction.
The upper roll is held down by a cylinder mechanism (not shown) to release variations due to changes in plate thickness.

Note that this guide portion 9 is connected to the bead melting portion 5 as described above.
Since both plasma torches 5a, 5a are arranged with their respective bead melting and cutting positions being approximately at the same position, it is possible to arrange one set each at the front and rear stages of the bead melting section 5, which simplifies the process. There is. It is also possible to use equipment that integrates a web guide and presser roll.

The slag removal section 7 is composed of rotatable upper and lower brushes 6.6 that press against the upper and lower bead melting and cutting portions of the shaped steel 2, and removes the molten scale generated during the melting operation by the plasma torch 5a. be. Note that the brush 6 used here is made of a hard material and has a thick wire diameter. This is because the molten scale is slag-like and extremely brittle, consisting mainly of iron oxide, so it is advantageous to have a strong cracking action to remove the molten scale.

The cleaning section 12 includes a cleaning brush 12a, a high-pressure water jet nozzle 12b, and an air blower 12c.

Then, the surfaces of both flanges 2a and web 2b of the shaped steel 2 are rubbed with the cleaning brush 12a, and then the high-pressure water jet nozzle 12b is
Blow off the attached NOx with high-pressure water from
Finally, the air blower 12c is used to drain the water. Note that this cleaning section 12 has such a simple structure because the aforementioned mist spraying section 10 forms a water film (mist) on the surface of the shaped steel 2, thereby reducing the adhesion of NOx and scale. can do.

The collecting section 13 includes a screw conveyor 13a installed on the lower surface of the conveying table 14 of the bead removing device 1 over the entire length of the conveying table 14, and a belt conveyor 13b installed after the slag removing section 7. It has become. The scale and flash scattered within the transport table 14 are collected by the screw conveyor 13a on the underside of the table, and this screw conveyor 1
The scale flash collected in step 3a is discharged by a belt conveyor 13b and processed in bulk.

The bead removal work using the bead removal device 1 having such a configuration is carried out first after completing welding to the H-shaped steel in the high-frequency resistance welding section 3, and then removing the cold shaped steel in the pre-treatment equipment 8. The beads 4 of No. 2 are melted in the bead melting section 5.

Note that the nozzle diameter of the torch 5a of the bead melting section 5 at this time is related to the cutting ability of the plasma and the double arc critical current, but is limited by the size of the bead 4. And when the nozzle diameter is 1 to 3φ, the plasma electric capacity is 25
0A force < MAX. The angle of the plasma torch 5a also has a relationship between arc stability and melt removal. Therefore, it is necessary to set the angle θ (see FIG. 6) with respect to the speed, so it is made variable with respect to the speed. Note that the torch angle in the cross-sectional direction may be in the optimum direction for removing the wire.
In the case of bead removal at a right-angled corner as in the case of the H-section steel in this embodiment, the angle is 45°. Furthermore, if the outer shape of the bead 4 is uneven, the distance from the torch 5a will fluctuate, causing arc instability. Therefore, the bead 4 immediately after the high-frequency resistance welding part 3 should be pressed with a roller (bead forming).
Accordingly, arc stability can be improved.

In addition, there are two types of plasma: transfer type and non-transition type, but the transfer type is advantageous in terms of efficiency, so we will consider the transfer type.

In this case, it is necessary to supply power to the base material side, and in this apparatus, the conveyance roller is used as a power supply device (base material side power supply roller). This power supply may be performed by separately providing a touch roller. Further, this power feeding roller on the base material side needs to be in constant contact with the product, and its material should preferably have as high electrical conductivity as possible. In this case, a good measure would be to attach a pressure roller from above to prevent poor contact.

Furthermore, as mentioned above, the plasma in the cross-sectional direction is 4
5", it must be set at a position where the bead can be removed the most. Also, the distance between the tip of the torch 5a and the bead 4 must be set to about 5 to 6 mm, and the distance between the section steel 2 and the plasma torch 5a They must be set at a certain interval.For this reason, there is a method to completely fix the section steel web passage, but if the section steel is bent or the web flatness is poor, it may damage the section steel. The distance between the torch 5a and the torch 5a is shifted.Therefore, both the web and flange of the H-section steel are connected to the cylinder (hydraulic

It is preferable to use a following roller type in which the torch 5a can follow the movement of the shaped steel 2 by applying the following roller to the shaped steel 2 using air or air.

Next, after stably melting and removing the beads 4 from the guide section 9 and the bead melting section 5 as described above, the slag adhering to the periphery of the beads 4 is removed by the brush 6 in the slag removal section 7. This brush 6 is rotated in the flow direction of the production line. Further, as the brush material, any material such as metal or nylon can be used.

During the slag removal work, air is injected into the brush to prevent it from clogging, and the brush is surrounded by a hood to prevent slag from scattering to the surrounding area. By blowing away the slag on the brush surface, the efficiency of the slag removal work is improved. Although slag is always generated, it is possible to create a condition in which it is very easy to peel off by changing the torch angle.

Next, both flanges 2a and web 2b surfaces of the shaped steel 2 are rubbed in the cleaning section 12, and the adhered NOx is washed off by blowing off with high pressure water from the high pressure water jet nozzle 12b.

In this way, the work of removing beads generated during welding of the welded H-section steel is completed.

Note that the removing device of the present invention can be applied to removing beads from welded H-beams of the above-described embodiments, as well as from electric resistance welded pipes, T-beams, and the like.

[Effects of the Invention] The bead removing device of the present invention includes a bead melting section for melting beads generated during welding work, and a slag removing section comprising a brush installed after the bead melting section. , a pretreatment equipment for cooling the welded shaped steel provided upstream of the bead melting section, a guide section for stabilizing the feeding shape of the shaped steel, and a pretreatment facility provided upstream of the bead melting section, a mist spraying section that forms a water film on the surface of the bead; a dust collection section that prevents dust from scattering during bead melting cutting at the bead melting section; a bead melting part;
A cleaning device provided after the slag removal section;
The present invention is characterized in that it includes a collection section that collects and discharges scale flash generated during bead melt cutting.

According to this configuration, by actively melting the bead at the bead melting part, the bead shape and bead heat amount can be adjusted, unlike the conventional method in which the bead is made into a solvent by bead combustion (oxidation reaction and oxygen pressure) by oxygen spraying. Bead removal work can be easily and consistently performed without being affected.

In addition, by actively melting the bead at the melting point, the bead can be removed in a cold region, so it is not limited to the removal work location and can be removed further away from the welding point to the H-beam steel. Bead removal work can be performed at the same position. Therefore, the oxidized slag generated and scattered during the bead removal work does not affect the weld to the H-section steel, and the bead can be removed reliably.

Furthermore, unlike conventional removal equipment, the bead is not removed (with solvent) near the weld to the H-beam, but at a location away from the weld to the H-beam, so it is not a welding quality control indicator. The shape of a certain bead can be fully confirmed.

In addition, by arranging the plasma torches at almost the same location, the constraint range due to bead melting and cutting is narrow and the guide section can be simplified, and the dust collection range can also be consolidated, so the dust collection volume can be reduced. Moreover, the uncut area at the start of the melt cutting operation is reduced, which is advantageous in terms of yield.

In addition, the pretreatment equipment and mist spraying unit eliminate NOx after bead melting and cutting with a plasma torch.

Scale adhesion is reduced, making post-processing easier. This can simplify the slag removal section and the cleaning device.

[Brief explanation of the drawing]

Figure 1 shows a welding H equipped with the bead removal device of the present invention.
A schematic diagram showing the production line of section steel, Figure 2 is an enlarged detailed view of section A in Figure 1, Figure 3 is a view taken along line C-C in Figure 2, and Figure 4 is section B in Figure 1. 5 is a view taken along line D--D in FIG. 2, FIG. 6 is a schematic view showing the torch angle, and FIG. 7 is a front view showing a conventional bead removal device. DESCRIPTION OF SYMBOLS 1... Bead removal device, 2... Shaped steel, 2a... Both flanges, 2b... Web, 3... High frequency resistance welding part, 4... Bead, 5... Bead melting part , plasma torch 5a. 6... Brush, 7... Slag removal section, 8... Pretreatment equipment, 9... Guide section, 9a... Web guide roller, 9b... Presser roll, 10... Mist spraying Part, 11... Dust collection part, 11a... Partition plate, 12.
...Cleaning section, 12a...Cleaning brush, 12b...High pressure water jet nozzle, 12c...Air blower 13...
Collection section, 13a...Screw conveyor, 13b...
・Belt conveyor, 14...conveyance table.

Claims (1)

[Claims] A slag that is arranged on a production line for section steel and includes a bead melting section that melts beads generated during welding work for forming section steel, and a brush installed after the bead melting section. a bead removal device comprising: a pretreatment facility for cooling the welded shaped steel provided upstream of the bead melting section; a guide section for stabilizing the feeding shape of the shaped steel; It is installed before the melting section,
A mist spraying part that forms a water film on the surface of the shaped steel, a dust collecting part that prevents dust from scattering during bead melting cutting at the bead melting part, and melting each of the generated beads at a position close to each other. A bead removal method comprising: the bead melting section that can perform the above-mentioned bead melting, a cleaning device provided after the slag removal section, and a collection section that collects and discharges scale and flash generated during bead melting and cutting. Device.