CN113828654A - Method and device for correcting welding deformation of steel bridge sheet member - Google Patents
Method and device for correcting welding deformation of steel bridge sheet member Download PDFInfo
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- CN113828654A CN113828654A CN202111297304.5A CN202111297304A CN113828654A CN 113828654 A CN113828654 A CN 113828654A CN 202111297304 A CN202111297304 A CN 202111297304A CN 113828654 A CN113828654 A CN 113828654A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/06—Removing local distortions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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Abstract
The invention discloses a method and a device for correcting welding deformation of a steel bridge sheet component, wherein the correction method comprises the following steps: step 1: measuring the wave deformation generated at the edge of the welded steel bridge sheet component and the bulge deformation generated in the middle of the steel bridge sheet component to obtain the deformation amount; step 2: respectively heating the wave deformation area and the bulge deformation area by adopting an induction heating mode, and determining induction heating temperature and heating time according to the deformation obtained in the step 1 so as to ensure that the wave deformation area and the bulge deformation area are heated and expanded to generate plastic deformation; and step 3: and after heating is finished, naturally cooling the wave deformation area and the bulge deformation area and then contracting the wave deformation area and the bulge deformation area to flatten the wave deformation area and the bulge deformation area. The correction method has the advantages of high heating speed, improved working efficiency and capability of avoiding the situation that the traditional flame heating is easy to cause overburning.
Description
Technical Field
The invention relates to the technical field of steel bridge manufacturing, in particular to a method and a device for correcting welding deformation of a steel bridge sheet component.
Background
The diaphragm in the steel box girder bridge structure is a typical thin-wall structure and is composed of a thin diaphragm and longitudinal and transverse stiffeners, and a manhole or a cable slotted hole is formed by cutting holes and welding reinforcing rings on the diaphragm at a local position. The method is characterized in that the thin steel plates are frequently subjected to wave deformation during welding, tensile stress is generated near the welding seam after the thin steel plates are welded, compressive stress is generated in the area far away from the welding seam, when the compressive stress reaches critical stress, the thin steel plates lose bearing capacity due to the wave deformation, the plate edge is not directly twisted, and the flatness of the middle part of the steel plate is lost due to bulges. Although corresponding deformation control measures are adopted for the welding deformation, the welding deformation cannot be avoided, and post-welding correction is needed to ensure the flatness and the dimensional accuracy of the plate, so that the bearing capacity of the plate is ensured.
The existing steel structure welding deformation correction mostly adopts mechanical correction and flame correction, the mechanical correction is only suitable for regular components, the operation difficulty is large in the mode of adopting mechanical correction for the wave deformation and bulge deformation of a large-scale bridge partition plate, the effect is poor, and the requirement on product precision cannot be met. For this reason, both irregular members and irregular deformations are corrected with artificial flames. The flame correction is a correction method for heating a welding seam area to a certain temperature by adopting flame and then cooling the welding seam area by air to cool and contract a heating area, the method adopts heat generated by burning acetylene or propane and other combustible gases in oxygen to heat a steel plate, the consumption of the combustible gases is high, a large amount of CO2 gas and high noise are generated in the production process, the working environment is poor, few workers are willing to do the work at present, the steel plate is baked by the heat generated by burning the flame during heating, the heat is transferred to the inside of the steel plate through the surface of the steel plate, the heat efficiency is low, the production efficiency is low, and mechanized automatic operation cannot be realized, so the deformation correction is a difficulty in the current steel structure production line.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method and a device for correcting welding deformation of a steel bridge sheet component.
The technical problem to be solved by the invention is realized by the following technical scheme:
a method for correcting welding deformation of a steel bridge sheet component comprises the following steps:
step 1: measuring the wave deformation generated at the edge of the welded steel bridge sheet component and the bulge deformation generated in the middle of the steel bridge sheet component to obtain the deformation amount;
step 2: respectively heating the wave deformation area and the bulge deformation area by adopting an induction heating mode, and determining induction heating temperature and heating time according to the deformation obtained in the step 1 so as to ensure that the wave deformation area and the bulge deformation area are heated and expanded to generate plastic deformation;
and step 3: and after heating is finished, naturally cooling the wave deformation area and the bulge deformation area and then contracting the wave deformation area and the bulge deformation area to flatten the wave deformation area and the bulge deformation area.
Furthermore, the induction heating mode is a heating mode in which a variable frequency induction power supply drives an induction coil.
Further, when the wave deformation area is heated, the induction coil is heated in a triangular or linear mode; when the bulge deformation area is heated, the induction coil is heated in a point-shaped mode, and when the heating temperature of the point-shaped position reaches the set temperature, the induction coil moves to the next point-shaped position for heating.
Furthermore, the frequency of the variable frequency induction power supply is 3 KHZ-10 KHZ, and the power is 30-60 KVA; the heating temperature of the induction coil is 600-800 ℃, and the heating area is 50-100 mm2。
The invention also provides a device for correcting the welding deformation of the steel bridge sheet component, which comprises: the device comprises a track, a cantilever type gantry, a water-cooled induction coil, a mechanical arm, a variable-frequency induction power supply and a temperature measuring device; wherein the content of the first and second substances,
the cantilever gantry is positioned on the track; the mechanical arm is connected to the cantilever type door frame and can move left and right along the cantilever type door frame; the end part of the mechanical arm is fixed with the water-cooled induction coil and the temperature measuring device; the water-cooled induction coil is electrically connected with the variable-frequency induction power supply.
Further, the cantilever type gantry comprises a stand column, a cross beam and a sliding seat positioned on the cross beam; the cross beam is connected with the upright column in a sliding way and can move up and down along the upright column; the sliding seat is connected with the cross beam in a sliding manner and can move left and right along the cross beam; the mechanical arm is fixed on the sliding seat and is positioned below the cross beam.
The invention has the beneficial effects that:
1. the correction method has the advantages that the heating speed is high, the working efficiency is improved, and the situation that the traditional flame heating is easy to cause overburning is avoided;
2. the correction method generates little noise, greatly improves the working environment of operators and puts an end to CO compared with the traditional process2The generation of greenhouse gases;
3. the induction coil adopts mechanical arm clamping and moving, is simple to operate and wide in operation coverage range, reduces the degree of dependence on the skill of workers, and simultaneously reduces the influence of an induction magnetic field on an operator.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic structural view of a steel bridge sheet after straightening;
FIG. 2 is a schematic structural view of a steel bridge sheet before straightening;
FIGS. 3(a) to 3(c) are schematic views illustrating the principle of correction of an induction heating coil;
fig. 4 is a schematic structural view of the orthotic device.
Description of reference numerals:
1-a track; 2-cantilever type gantry; 3-water-cooled induction heating coil; 4-a mechanical arm; 5-a variable frequency induction power supply; 6-steel bridge sheet member; 7-a working platform; 2-1-column; 2-2-beam; 2-3-a slide; 2-4-a slide block; 2-5-a first guide rail; 2-6-a first lead screw mechanism; 2-7-a second guide rail; 2-8-second screw mechanism.
Detailed Description
The present invention will be described in further detail with reference to specific examples and fig. 1 to 4, but the embodiments of the present invention are not limited thereto.
Example 1
The invention provides a welding deformation correcting device for a steel bridge sheet component, which comprises: the device comprises a track 1, a cantilever type portal 2, a water-cooled induction heating coil 3, a mechanical arm 4, a variable-frequency induction power supply 5 and a temperature measuring device; wherein the content of the first and second substances,
the cantilever type gantry 2 is positioned on the track 1 and can move back and forth along the track 1; the mechanical arm 4 is connected to the cantilever type gantry 2 and can move left and right along the cantilever type gantry 2 under the control of a controller; the end part of the mechanical arm 4 is fixed with the water-cooled induction heating coil 3, and the water-cooled induction heating coil 3 is electrically connected with a variable-frequency induction power supply 5; the temperature measuring device is fixed on the mechanical arm 4 and used for monitoring the temperature of the heating area in real time.
Further, the variable-frequency induction power supply 5 is an IGBT power supply, the IGBT power supply can realize a variable-frequency function, the higher the frequency is, the higher the skin effect is when heating is performed, a temperature gradient is easily formed in the thickness direction of the steel plate, and the function of thermal straightening can be better realized by selecting proper induction frequency and heating temperature.
Further, the temperature measuring device is an infrared temperature measuring device.
Further, the cantilever type gantry 2 comprises a vertical column 2-1, a cross beam 2-2 and a sliding seat 2-3 positioned on the cross beam 2-2; a sliding block 2-4 is fixed on the cross beam 2-2, a first guide rail 2-5 is fixed on the upright post 2-1, the sliding block 2-4 is connected with the upright post 2-1 in a sliding manner through the first guide rail 2-5 under the action of a first lead screw mechanism 2-6, and the cross beam 2-2 can move up and down along the upright post 2-1; a second guide rail 2-7 is arranged on the cross beam 2-2, the sliding seat 2-3 is in sliding connection with the cross beam 2-2 through the second guide rail 2-7 under the action of a second lead screw mechanism 2-8, and the sliding seat 2-3 can move left and right along the cross beam 2-2; the mechanical arm 4 is fixed on the sliding seat 2-3 and is positioned below the cross beam 2-2, and the mechanical arm 4 can move left and right along the cross beam 2-2 under the driving of the sliding seat 2-3.
When the correction device works, the steel bridge sheet member 6 is placed on the working platform 7, and then the water-cooled induction heating coil 3 can heat and correct each deformed part of the steel bridge sheet member 6 by controlling the movement of the mechanical arm 4.
Example 2
The embodiment of the invention provides a welding deformation correction method for a steel bridge sheet member, wherein the steel bridge sheet member is specifically a diaphragm plate, and the thickness of the steel bridge sheet member is 10-20 mm; the method comprises the following steps:
step 1: measuring the deformation of the welded steel bridge sheet member to obtain the deformation amount; the steel bridge sheet comprises a diaphragm plate, and a transverse stiffening rib, a vertical stiffening rib and a manhole stiffening rib which are welded on the diaphragm plate; after welding, the edge of the diaphragm plate can generate wave deformation, and the middle part of the diaphragm plate can generate bulge deformation.
Step 2: and (3) respectively heating the wave deformation area and the bulge deformation area in an induction heating mode, and determining the induction heating temperature and the heating time according to the deformation obtained in the step (1) so that the wave deformation area and the bulge deformation area are heated and expanded to generate plastic deformation.
The induction heating mode is a heating mode that a variable frequency induction power supply drives an induction coil; the variable-frequency induction power supply is an IGBT power supply, the IGBT power supply can realize a variable-frequency function, the higher the frequency is, the higher the skin effect is when heating, a temperature gradient is easily formed in the thickness direction of a steel plate deformation area, the surface temperature of a steel plate is far higher than the internal temperature of the steel plate, as shown in figure 3(b), when the surface of the steel plate deformation area generates plastic deformation, the internal part of the steel plate only generates elastic deformation, therefore, when the steel plate is cooled, as shown in figure 3(c), the plastic deformation area is cooled, shrunk and stretches the surrounding area, and therefore, the deformation is corrected by generating a force in the direction opposite to the deformation.
The correction principle of the invention is as follows:
when the water-cooled induction heating coil is placed above the deformation area of the diaphragm plate and electrified, eddy current is generated in the deformation area of the surface of the diaphragm plate, and the eddy current generates resistance heat to heat the deformation area; after the heating temperature rises, the deformation zone is heated to expand, the expansion is restrained by the thin plate with lower ambient temperature, and the deformation zone generates plastic deformation; after the water-cooled induction heating coil is powered off, the deformation zone begins to cool, and due to plastic deformation, the deformation zone is shortened, the surrounding zone is stretched, and force in the direction opposite to the deformation is generated to correct the deformation.
When the wave deformation area is heated, the water-cooled induction heating coil is heated in a triangular or linear mode; for the part (a) with narrower width in fig. 2, heating is carried out by adopting a linear heating mode; in fig. 2, the portion (b) having a large wave-deforming area is heated by a triangular heating method.
When the bulge deformation region is heated, that is, when the portion (c) in fig. 2 is heated, the water-cooled induction heating coil heats in a dotted manner. And (3) operating the water-cooled induction heating coil through the mechanical arm to heat the deformation area of the diaphragm plate according to specified parameters, and moving to the next position to heat when the heating temperature reaches 600-800 ℃ during heating.
Wherein the frequency of the induction power supply is 3 KHZ-10 KHZ, and the power is 30-60 KVA; the heating temperature of the induction heating coil is 600-800 ℃, and the heating area is 50-100 mm2. The heating time is related to the deformation, and the larger the deformation is, the longer the heating time is under the condition that other parameters are unchanged.
And step 3: and after heating is finished, the wave deformation area and the bulge deformation area are naturally cooled and then contracted, and welding deformation is adjusted by means of metal contraction of the deformation area, so that the wave deformation area and the bulge deformation area are leveled, and the deformation correction of the steel bridge sheet is finished.
According to the correction method, the automatic production of the welding deformation correction of the steel bridge sheet is realized by clamping the induction heating coil by the mechanical arm, the production efficiency is improved, and the CO is reduced2Gas emission and noise reduction of working environment.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (6)
1. A method for correcting welding deformation of a steel bridge sheet component is characterized by comprising the following steps:
step 1: measuring the wave deformation generated at the edge of the welded steel bridge sheet component and the bulge deformation generated in the middle of the steel bridge sheet component to obtain the deformation amount;
step 2: respectively heating the wave deformation area and the bulge deformation area by adopting an induction heating mode, and determining induction heating temperature and heating time according to the deformation obtained in the step 1 so as to ensure that the wave deformation area and the bulge deformation area are heated and expanded to generate plastic deformation;
and step 3: and after heating is finished, naturally cooling the wave deformation area and the bulge deformation area and then contracting the wave deformation area and the bulge deformation area to flatten the wave deformation area and the bulge deformation area.
2. The method for correcting welding deformation of a steel bridge sheet member according to claim 1, wherein the induction heating mode is a heating mode in which an induction coil is driven by a variable frequency induction power supply.
3. The method for correcting welding deformation of a steel bridge sheet member according to claim 2, wherein the induction coil is heated in a triangular or linear manner when the wave deformation region is heated; when the bulge deformation area is heated, the induction coil is heated in a point-shaped mode, and when the heating temperature of the point-shaped position reaches the set temperature, the induction coil moves to the next point-shaped position for heating.
4. The welding deformation correcting method for the steel bridge sheet member according to claim 3, wherein the frequency of the variable frequency induction power supply is 3 KHZ-10 KHZ, and the power is 30-60 KVA; the heating temperature of the induction coil is 600-800 ℃, and the heating area is 50-100 mm2。
5. A steel bridge sheet member welding deformation correcting device suitable for the correcting method according to any one of claims 1 to 4, characterized by comprising: the device comprises a track, a cantilever type gantry, a water-cooled induction coil, a mechanical arm, a variable-frequency induction power supply and a temperature measuring device; wherein the content of the first and second substances,
the cantilever gantry is positioned on the track; the mechanical arm is connected to the cantilever type door frame and can move left and right along the cantilever type door frame; the end part of the mechanical arm is fixed with the water-cooled induction coil and the temperature measuring device; the water-cooled induction coil is electrically connected with the variable-frequency induction power supply.
6. The device for correcting welding deformation of steel bridge sheets according to claim 5, wherein the cantilever type portal comprises a vertical column, a cross beam and a sliding seat positioned on the cross beam; the cross beam is connected with the upright column in a sliding way and can move up and down along the upright column; the sliding seat is connected with the cross beam in a sliding manner and can move left and right along the cross beam; the mechanical arm is fixed on the sliding seat and is positioned below the cross beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111297304.5A CN113828654A (en) | 2021-11-04 | 2021-11-04 | Method and device for correcting welding deformation of steel bridge sheet member |
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| CN202111297304.5A CN113828654A (en) | 2021-11-04 | 2021-11-04 | Method and device for correcting welding deformation of steel bridge sheet member |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114619161A (en) * | 2022-02-16 | 2022-06-14 | 江苏科技大学 | Model construction and leveling method for sheet welding deformation |
| CN114682649A (en) * | 2022-02-16 | 2022-07-01 | 江苏科技大学 | Intelligent leveling system with automatic temperature control function and method thereof |
| CN115365691A (en) * | 2022-08-16 | 2022-11-22 | 北京首钢建设集团有限公司 | Steel structure ski jump platform track panel forming precision control method |
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2021
- 2021-11-04 CN CN202111297304.5A patent/CN113828654A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114619161A (en) * | 2022-02-16 | 2022-06-14 | 江苏科技大学 | Model construction and leveling method for sheet welding deformation |
| CN114682649A (en) * | 2022-02-16 | 2022-07-01 | 江苏科技大学 | Intelligent leveling system with automatic temperature control function and method thereof |
| WO2023155295A1 (en) * | 2022-02-16 | 2023-08-24 | 江苏科技大学 | Sheet welding deformation model construction method and sheet welding deformation leveling method |
| CN115365691A (en) * | 2022-08-16 | 2022-11-22 | 北京首钢建设集团有限公司 | Steel structure ski jump platform track panel forming precision control method |
| CN115365691B (en) * | 2022-08-16 | 2023-09-15 | 北京首钢建设集团有限公司 | Method for controlling forming precision of steel structure skiing diving platform race track panel |
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