JPH0565280B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is a method for removing beads that occur between a web and a flange when manufacturing steel sections such as welded H-section steel manufactured by high-frequency resistance welding. The present invention relates to a removal device for cleaning.

[Prior art]

Conventionally, this type of bead removal apparatus is known to blow oxygen to the bead while it is heated immediately after welding, and to melt the bead by the oxidation reaction and oxygen pressure. (Jitsukai 54-100926
As shown in FIG. 7, this conventional bead removal device includes a trolley 33 that runs on a rail 32 installed above the exit side of a high-frequency induction welding machine 31, and a high-frequency induction welding machine mounted on this trolley 33. A pair of arm rods 35 are suspended to sandwich the shaped steel section 34 welded and formed at 31, and each arm rod 35 can be moved up and down and swung so as to face the bead portion of the section steel 34. It consists of an oxygen blowing nozzle 36 which can be freely installed.

[Problems to be solved by this invention]

However, in such a conventional removal device, since the bead is melted by bead combustion using oxygen spray, the oxygen spray nozzle 36 is installed at a location where the bead is in a high temperature range, that is, by welding to the H-beam steel 34. It must be done near the location. Further, the oxygen blowing nozzle 36 must be installed from the outlet side to the inlet side of the line flow in the production line of the welded H-beam 34, so that the locations where the oxygen blowing nozzle 36 can be installed are limited.

If the mounting position of the oxygen blowing nozzle 36 is limited to the vicinity of the welding position in this way, the oxidized slag generated during bead cutting may be exposed to the web support roll 37 or the contact between the web 38 and the flange 39 during welding. This scatters onto the contact portion 40, causing the roll 37 to get caught in the contact portion 40, and the like.

Furthermore, since the bead is cut near the welding position to the H-shaped 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 H-beam 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 cuts the bead. This results in variations in which the depth becomes 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 to solve the problem]

According to this inventive device, a welding section for manufacturing a section steel is equipped with a bead melting section for melting beads generated during welding work, and a slag removal section consisting of a brush installed after the bead melting section. H
Place a section steel bead removal device.

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 that collects and discharges scale and flash generated during bead melting and cutting.

By actively melting the bead at the bead melting portion, 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 molten 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 of the section steel, thereby removing the oxidized slag. To surely remove beads without being affected by scattering, etc.

Furthermore, since each generated bead can be melt-cut 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. And since the melt cutting is performed at a close position,
The constraint range for this purpose is narrow and the guide device can be simplified, and the dust collection range can be consolidated, so the dust collection capacity can also be reduced.

In addition, the pre-treatment equipment and mist spraying section reduce the adhesion of NO _x 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. This is what I did.

〔Example〕

The bead removing device of the present invention will be described below with reference to an embodiment in which the bead removing device of the present invention 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-beams 2 is installed at a certain distance from the high-frequency resistance welding section 3 that forms the welded H-beams 2. 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. Become.

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 10 that is provided at the front stage forms a water film on the surface of the shaped steel 2, and 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 each generated bead 4 at a close position, a cleaning section 12 provided after the slag removal section 7, and a cleaning section 12 that collects scale and flash generated during bead melting cutting. It is configured to include a collection section 13 for discharging the water.

The pre-treatment equipment 8 is equipped with water-cooled steel, since the shaped steel 2 is hot (300 to 400 degrees Celsius) after welding is completed, and if it is melted and cut in this state, the molten slag will have a strong adhesion force, making it difficult to remove the slag. This is to lower the temperature of the shaped steel 2 (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 before the bead melting section 5, and forms a water film (mist) on the surface of the shaped steel 2 after the pretreatment equipment 8 completes draining. This water film (mist) reduces the adhesion of NO _x and scale generated during melt cutting with the plasma torch 5a of the bead melting part 5, which will be described later, to the shaped steel 2, and facilitates post-treatment. It is something to do. However, if the amount of water is too large, the bead cutting shape will deteriorate.

The dust collecting section 11 is installed before the bead melting section 5, and dust is generated by the plasma torch 5a.
It consists of a dust collection hood that collects and discharges NO _x . In addition, inside this dust collection hood,
Flashing by plasma torch 5a is 4-5m
Therefore, a partition plate 11a (a chain, a steel plate, etc. may be used) is provided to prevent the flash from scattering.

The bead melting section 5 includes both plasma torches 5a and 5 that melt the upper and lower beads 4 generated at the bases of the flanges 2a and the web 2b of the H-section steel 2.
a, and an accompanying mechanism section (not shown) for performing bead melting work using the plasma torches 5a, 5a.
It is made up of. The accompanying mechanisms include a following roller for the melting part that maintains a constant distance from the web 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 terminal on the torch side. It is conceivable to have a power supply part with a positive terminal connected to the material side power supply roller 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. Melting is possible using any of these methods, and if there are no problems with oxidation or dust formation on 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-beam steel in this example, air plasma is used. Note that when using something other than plasma that does not use gas, such as plasma, the melt cannot be blown away, so a blowing gas injection port is required near the bead melting part.

Further, both plasma torches 5a, 5a are arranged so that the upper and lower bead melting and cutting positions are approximately the same. This is because if the melting and cutting positions of the upper and lower torches 5a, 5a are set apart from each other, the flash scattering range of each torch will be wide, so the guide part 9 and the dust collection part 11 need to be placed further apart. This is because multiple units of each are required. Therefore, both torches 5a, 5
It is desirable that the distance L between a is as small as possible. Furthermore, both plasma torches 5a, 5a are installed such that the one that melts and cuts the lower bead is installed on the input side of the shaped steel 2, and the one that melts and cuts the upper bead is installed on the exit side of the shaped steel 2. . Furthermore, plasma torch 5
Since the cutting shape changes greatly depending on the setting conditions of a, intelligent 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 web center, which is a bead cutting center, and guides the vicinity of the flange 2a for stability. Further, the presser roll 9b is attached to the flange 2a in order to suppress vertical movement of the section steel 2.
It is in contact with. 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 with low friction, and the upper roll is made of a cylinder mechanism (not shown).
The plate is pressed down to eliminate variations due to changes in plate thickness.

Note that this guide portion 9 is provided with both plasma torches 5a, 5a in the bead melting portion 5 as described above.
Since the bead melting and cutting positions are arranged at almost the same position, the bead melting portion 5
This is possible by arranging one set each in the front and rear stages, which simplifies the process. It is also possible to use equipment that integrates a web guide and presser roll.

The slag removal unit 7 is composed of rotatable upper and lower brushes 6, 6 that press against the upper and lower bead melt cutting parts 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 injection nozzle 12b, and an air blower 12c. Then, use the cleaning brush 12a to clean the shaped steel 2.
Both flanges 2a and web 2b surfaces are rubbed, then high-pressure water from a high-pressure water jet nozzle 12b is blown away to wash away adhering _NOx , and finally, water is removed by an air blow 12c. Note that this cleaning section 12 has such a simple structure because the above-mentioned mist spraying section 10 forms a water film (mist) on the surface of the section steel 2, reducing the adhesion of NO _x and scale. It can be done.

The collecting unit 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;
A belt conveyor 13b is installed at the rear stage of the slag removing section 7. The scale and debris 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 and debris collected in step 3a are discharged by a belt conveyor 13b and processed all at once.

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

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. When the nozzle diameter is 1 to 3φ, the maximum plasma capacitance is 250A. 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 any direction as long as it is the optimum direction for bead removal, and in the case of bead removal at a right-angled corner like the H-section steel of this example, it is set to 45°. Furthermore, if the outer shape of the bead 4 is uneven, the distance to the torch 5a will fluctuate, causing arc instability. , 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 supply roller on the base material side must always be in 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 cross-sectional plasma torch must be set at a 45° angle to best remove the bead. Further, the distance between the tip of the torch 5a and the bead 4 must be set to about 5 to 6 mm, and the shaped steel 2 and the plasma torch 5a must be set at a constant distance. For this reason, there is a method of completely fixing the section steel web passage, but if the section steel is bent and the web flatness is poor, the section steel may be damaged or the distance from the torch 5a may shift. Therefore, for both the web and flange of the H-section steel, a follow-up roller method was adopted in which a cylinder (hydraulic or air can be used) is used to apply a follow-up roller to the section steel 2 so that the torch 5a can follow the movement of the section steel 2. That's good.

Next, after the bead 4 is stably melted and removed from the guide section 9 and the bead melting section 5 as described above, the slag adhering to the periphery of the bead 4 is removed by the brush 6 in the slag removal section 7. The brush 6 is rotated in the flow direction of the production line. In addition, as a 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 around. 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 NO _x is washed away by blowing away 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.

〔Effect 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 downstream of the bead melting section. A pre-treatment facility for cooling the welded shaped steel, a guide section for stabilizing the feeding shape of the shaped steel, and a guide section provided before the bead melting section, which prevents water film from forming on the surface of the shaped steel. a mist spraying section that forms a mist spraying section, a dust collecting section that prevents dust from scattering during bead melting cutting at the bead melting section, and a bead melting section that can melt each generated bead at a close position; The present invention is characterized by comprising a cleaning device provided downstream of the slag removal section, and a collection section that collects and discharges scale and flash generated during bead melt cutting.

According to this configuration, by actively melting the bead at the bead melting part, the bead is melted and cut by bead combustion (oxidation reaction and oxygen pressure) by conventional oxygen spraying.
Bead removal work can be easily and consistently performed without being affected by the bead shape and bead heat amount.

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 (cut) near the weld on the H-section steel, but at a location away from the weld on the H-section steel, which is a management index for welding quality. The shape of the bead can be clearly seen.

Further, by arranging the plasma torches at almost the same location, the constraint range by the bead melting cutting section 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, with pre-treatment equipment and mist spraying section,
NO _x after bead melt cutting with 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 is a schematic diagram showing a production line for welded H-section steel equipped with the bead removal device of the present invention, Figure 2 is an enlarged detailed view of section A in Figure 1, and Figure 3 is C in Figure 2.
4 is an enlarged detailed view of part B in FIG. 1, FIG. 5 is a view along line D-D in FIG. 2, FIG. 6 is a schematic diagram showing the torch angle, and FIG. The figure is a front view showing a conventional bead removal device. 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 part, 8...front Processing equipment, 9... Guide section, 9a... Web guide roller, 9b... Press roll, 10... Mist spraying section, 11... Dust collection section, 11a... Partition plate, 12... Cleaning section, 12
a...Cleaning brush, 12b...High pressure water jet nozzle, 12c...Air blow, 13...Collection section,
13a...screw conveyor, 13b...belt conveyor, 14...conveyance table.

Claims (1)

[Claims] 1. Consisting of a bead melting section that is placed on a section steel production line and melts beads generated during welding work for forming the section steel, and a brush installed after the bead melting section. A bead removal device comprising: a slag removal section; a pretreatment facility for cooling the molten steel section provided upstream of the bead melting section; a guide section for stabilizing the feeding shape of the section steel; a mist spraying section that is provided upstream of the bead melting section and forms a water film on the surface of the shaped steel; and a dust collecting section that prevents dust from scattering during bead melting cutting at the bead melting section; the bead melting section capable of melting each of the generated beads in close proximity; a cleaning device provided downstream of the slag removal section; and a collection system for collecting and discharging scale and flash generated during bead melting and cutting. A bead removal device comprising: