CN112548570A

CN112548570A - Thin plate welding device and thin plate welding deformation prevention method

Info

Publication number: CN112548570A
Application number: CN202011395668.2A
Authority: CN
Inventors: 王艳红; 吕以培; 黄华
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-03-26

Abstract

The invention discloses a sheet welding device which comprises a rack, a welding head, a primary pressing roll shaft, an annealing section, a secondary pressing roll shaft and conveying rolls, wherein a plurality of conveying rolls are parallelly erected on the rack; and the steel sheets to be spliced and welded are conveyed by the conveying roller to sequentially pass through the welding head to complete welding seam welding, pass through the primary pressing roller shaft pair, are annealed at high temperature in the annealing section to remove stress, pass through the secondary pressing roller shaft pair and are conveyed to the blanking end. The sheet welding device and the sheet welding deformation prevention method are suitable for continuous butt welding of longer sheets, are corrected by online heat treatment, can effectively reduce welding deformation, and improve welding quality and efficiency.

Description

Thin plate welding device and thin plate welding deformation prevention method

Technical Field

The invention relates to the technical field of thin plate welding, in particular to a thin plate welding device and a thin plate welding deformation prevention method.

Background

The sheet welded structure is widely applied to the manufacturing fields of large-scale structures such as railway transportation, ship engineering, aerospace aircrafts, automobile industry, superstructures of offshore drilling oil production platforms and the like. The thin plate has the characteristics of light weight, good processing performance (easy processing and forming), convenient connection and the like, and the thin plate in the embodiment refers to a weldable metal plate with the thickness of less than 4 mm. However, the thin plate has small self-restraint degree, and is deformed greatly during welding, the deformation includes but is not limited to transverse contraction, longitudinal contraction, rotation deformation, angular deformation, bending deformation and the like, wave deformation is generated due to instability in severe cases, and the deformation is difficult to correct, and particularly serious for some materials with large thermal expansion coefficients.

The welding deformation not only seriously affects the structural strength, the manufacturing precision and the service performance of the thin plate, but also even causes that the welding operation cannot be continued due to the deformation, so that the research on the thin plate welding deformation control technology, including the influencing factors and the control process generated by the welding deformation, is necessary to guide the production practice and improve the product quality.

The existing measures for controlling the deformation process of the thin plate comprise the following steps: correctly selecting a welding method and a welding material; the reverse deformation method and the rigid fixing method. The rigid fixing method is to fix the weldment on a jig with enough rigidity or temporarily install a welding support to increase the rigidity of the member to reduce the welding deformation, and then remove the rigid fixing when all welding seams on the member to be welded are cooled to room temperature, wherein the deformation generated by the member is greatly smaller than the welding deformation in a free state. If other measures for controlling welding deformation are matched, the welding deformation is controlled within the technical tolerance requirement range of the product. The inverse deformation principle is to correct the sheet welding deformation by imparting more mechanical deformation in the reverse direction. For example, when the sheet weld deformation is an inward arcuate deformation, the correction is made by imparting an outward arcuate deformation to a degree that exceeds the inward arcuate deformation.

However, the above-mentioned welding deformation process control measures are not high in deformation prevention control accuracy, complicated in operation, and much labor-consuming, and are not suitable for the continuous long thin plate welding field.

Therefore, it is required to develop a thin plate welding apparatus and a thin plate welding deformation prevention method.

Disclosure of Invention

The invention aims to provide a sheet welding device which is suitable for continuous butt welding of longer sheets, is corrected by online heat treatment, can effectively reduce welding deformation, and improves welding quality and efficiency.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention relates to a sheet welding device which comprises a rack, a welding head, a primary pressing roll shaft, an annealing section, a secondary pressing roll shaft and conveying rolls, wherein a plurality of conveying rolls are parallelly erected on the rack; and the steel sheets to be spliced and welded are conveyed by the conveying roller to sequentially pass through the welding head to complete welding seam welding, pass through the primary pressing roller shaft pair, are annealed at high temperature in the annealing section to remove stress, pass through the secondary pressing roller shaft pair and are conveyed to the blanking end.

Further, the annealing section is including intensification annealing section and heat preservation annealing section, intensification annealing section and heat preservation annealing section all are provided with a plurality of flame spray nozzles, the flame spray nozzle sets up both sides and the injection head orientation about the sheet steel the welding seam of sheet steel is regional around.

Furthermore, the temperature rising annealing section and the heat preservation annealing section are respectively provided with a first shield and a second shield facing the thin steel plate, and temperature sensors for measuring temperature are arranged in the first shield and the second shield.

Furthermore, the outer layers of the first protective cover and the second protective cover are coated with fireproof heat-insulating material layers.

Further, still include vibration mechanism, vibration mechanism sets up between intensification annealing section and the heat preservation annealing section, vibration mechanism can drive the sheet steel carries out the vibration ageing.

Further, the vibration mechanism includes vibrating motor, support end seat, lower roller and last roller, the sheet steel is in pass through between lower roller and the last roller, lower roller and last roller both ends are established through the bearing frame respectively on the support end seat, be provided with on the support end seat vibrating motor, the support end seat passes through the cushion and installs on the curb plate of frame.

Furthermore, a mounting table is arranged on the side plate of the rack at the position of the vibration mechanism, and the extending end of the supporting end seat is connected to the mounting table through a rubber cushion block bolt.

Furthermore, the two ends of the lower roll shaft are connected with sliding blocks through bearings, the sliding blocks are connected in the vertically arranged sliding grooves at the inner ends of the vertical plates of the supporting end seats in a guiding and sliding mode, and pressure springs are installed between the lower surfaces of the sliding blocks and the bearing plates of the supporting end seats.

The invention also discloses a thin plate welding deformation prevention method, which comprises the steps of welding the spliced thin steel plates in the conveying process, annealing after welding, and rolling and shaping after annealing.

Further, vibration aging treatment is carried out on the steel sheet in transmission in an annealing section.

Compared with the prior art, the invention has the beneficial technical effects that:

according to the sheet welding device, the annealing section is arranged between the primary pressing roll shaft pair and the secondary pressing roll shaft pair, so that the high-temperature heating annealing can be performed on the welding seam area of the sheet welded by the butt joint, the welding stress is reduced, and the welding deformation is reduced; the secondary flattening roll shaft rolls the thin steel plate with pressure again, so that the annealed steel plate can be flattened and shaped, and the flatness of the welded steel plate is ensured; and welding, annealing and shaping are all completed in the thin steel plate conveying process, so that the production efficiency is improved, and the labor is saved. The sheet welding device is suitable for continuous butt welding of longer sheets, can perform on-line heat treatment correction, can effectively reduce welding deformation, and improves welding quality and efficiency. In addition, the heating annealing section and the heat preservation annealing section are used for annealing the area around the welding seam of the thin steel plate in stages, an annealing heat treatment temperature curve is well fitted and set, and a good annealing destressing effect can be achieved; through first guard shield and the setting of second guard shield that outer all cladding has fire-resistant insulation material layer, can keep apart intensification annealing section and heat preservation annealing section, be convenient for respectively the controlled temperature, avoid the temperature outdiffusion moreover, cause heat energy loss. Through set up vibration mechanism between intensification annealing section and heat preservation annealing section, vibration mechanism passes through the lower roll axle and goes up the sheet steel that the roll shaft clamp passed through, can drive the sheet steel and vibrate together, through selecting suitable vibration frequency, can be better get rid of welding residual stress through the vibration mode. The mode of vibratory stress relief and annealing heat treatment is simultaneously applied, the effect of removing welding stress can be driven to be superposed, pretreatment is made for the shaping process, and a relatively flat welded steel plate can be obtained.

According to the sheet welding deformation prevention method, the temperature setting of heating annealing and heat preservation annealing can be carried out according to different materials of the welded thin steel sheets, and a better temperature curve can be fitted; through the mode of vibration, can further improvement stress release speed, improve production efficiency, the cooperation annealing heat treatment can reduce the heat treatment time, reduces energy consumption, obtains better economy and quality effect.

Drawings

The invention is further illustrated in the following description with reference to the drawings.

FIG. 1 is a schematic front view of a thin plate welding apparatus according to the present invention;

FIG. 2 is a schematic top view of the thin plate welding apparatus according to the present invention;

FIG. 3 is a schematic view of the mounting structure of the vibration mechanism of the present invention;

FIG. 4 is a schematic view of the process of the present invention.

Description of reference numerals: 1. a frame; 101. an air outlet; 102. mounting a step; 2. welding a head; 201. a slide base; 3. primarily pressing the roll shaft; 4. a temperature-raising annealing section; 401. a first shield; 5. a heat preservation annealing section; 501. a second shield; 6. a secondary flattening roll shaft; 7. a vibration mechanism; 701. a vibration motor; 702. a support end seat; 703. a lower roll shaft; 7031. a slider; 704. an upper roll shaft; 705. a pressure spring; 706. a rubber cushion block; 8. a conveying roller; 9. a thin steel sheet; 10. and a transverse limiting wheel.

Detailed Description

The core of the invention is to provide a thin plate welding device and a thin plate welding deformation prevention method, which are suitable for continuous and long thin plate butt welding, are corrected by online heat treatment, can effectively reduce welding deformation, and improve welding quality and efficiency.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Referring to the drawings, fig. 1 is a front view schematically illustrating a thin plate welding apparatus according to the present invention; FIG. 2 is a schematic top view of the thin plate welding apparatus according to the present invention; FIG. 3 is a schematic view of the mounting structure of the vibration mechanism of the present invention; FIG. 4 is a schematic view of the process of the present invention.

In a specific embodiment, as shown in fig. 1 and fig. 2, a sheet welding device comprises a frame 1, a welding head 2, a primary pressing roller shaft 3, an annealing section, a secondary pressing roller shaft 6 and a plurality of conveying rollers 8, wherein the plurality of conveying rollers 8 are parallelly erected on the frame 1, the welding head 2, the primary pressing roller shaft 3, the annealing section and the secondary pressing roller shaft 6 are sequentially arranged on the frame 1 from a feeding end to a discharging end, and the primary pressing roller shaft 3 and the secondary pressing roller shaft 6 are driven to rotate by a motor transmission mechanism. Two steel sheets 9 which need to be spliced and welded together are conveyed on a conveying roller 8 and sequentially pass through a welding head 2 to complete welding seam welding, primary pre-shaping is carried out between the primary pressing roller shaft 3 pairs, welding stress is removed by high-temperature heating annealing in an annealing section, secondary pressing roller shaft 6 pairs are pressed and shaped again, and finally the steel sheets are conveyed to a blanking end to be blanked or conveyed to a plate rolling machine to be rolled.

Specifically, as shown in fig. 1 and 2, the welding head 2 can slide and lock on the slide rails on the top side wall of the feeding end of the frame 1 through the slide carriage 201, and the slide rails are vertically arranged. Through the sliding arrangement mode, the height position of the welding head 2 can be finely adjusted according to the thickness change of the thin steel plate 9, and a good welding effect is obtained. Simultaneously, the primary compression roller shaft 3 and the secondary compression roller shaft 6 are provided with ring groove abdicating at the welding seam position finished by the welding head 2, so that the welding seam residual height can be prevented from being directly rolled, and the shaping of the surrounding area is influenced.

Specifically, as shown in fig. 1, a transverse limiting wheel 10 is further arranged on the inner wall of the side plate of the frame 1, and the rotating outer ring of the transverse limiting wheel 10 is in rolling contact with the outer side edge of the thin steel plate 9, so that the welding seam is prevented from being positioned below the welding head 2 due to the dislocation of the thin steel plate 9. The transverse limiting wheel 10 is installed at the working end of the electric push rod, and the electric push rod base is connected to the inner wall of the side plate of the rack 1 through bolts.

An annealing section is arranged between the primary pressing roll shaft 3 pair and the secondary pressing roll shaft 6 pair, so that the welding seam area of the thin plate welded by the butt joint 2 can be subjected to high-temperature heating annealing, the welding stress is reduced, and the welding deformation is reduced; the secondary flattening roller shaft 6 rolls the thin steel plate 9 with pressure again, so that the annealed steel plate can be flattened and shaped, and the flatness of the welded steel plate is ensured; and welding, annealing and shaping are all completed in the thin steel plate conveying process, so that the production efficiency is improved, and the labor is saved. The sheet welding device is suitable for continuous butt welding of longer sheets, can perform on-line heat treatment correction, can effectively reduce welding deformation, and improves welding quality and efficiency.

In one embodiment of the present invention, as shown in fig. 1 and 2, the annealing section includes a temperature raising and annealing section 4 and a temperature maintaining and annealing section 5, and the temperature raising and annealing section 4 and the temperature maintaining and annealing section 5 are each provided with a plurality of flame spray heads which are disposed on both upper and lower sides of the thin steel sheet 9 and which face the area around the weld of the thin steel sheet 9.

Specifically, as shown in fig. 1, the temperature increasing annealing section 4 and the temperature maintaining annealing section 5 are provided with a first shield 401 and a second shield 501 facing the thin steel plate 9, respectively, and temperature sensors for measuring temperature are provided in the first shield 401 and the second shield 501. Two of the temperature sensors are provided on the bottom cases of the first and

second shields

401 and 501 and upwardly pick up the temperature of the surface of the thin steel plate 9. The temperature sensor is electrically connected with a temperature controller of the equipment and controls the heating power of the flame according to a set temperature range. The temperature range of the heating and annealing section 4 is set to 520-600 ℃ according to different materials of the welded thin steel plate 9, and the temperature range of the heat preservation and annealing section 5 is set to 300-420 ℃. The top of the heating and annealing section 4 and the heat preservation and annealing section 5 is provided with an air outlet 101 on the top of the frame 1, and the air outlet 101 is communicated to a waste gas treatment system for discharging.

Specifically, as shown in fig. 1, the outer layers of the first shield 401 and the second shield 501 are both coated with a refractory insulating material layer. The fireproof heat-insulating material layer is a rock wool board or a fireproof perlite filling layer.

The heating annealing section 4 and the heat preservation annealing section 5 are used for annealing the area around the welding seam of the thin steel plate 9 in stages, and an annealing heat treatment temperature curve is well fitted and set, so that a good annealing stress-relief effect can be achieved; through the setting of first guard shield 401 and second guard shield 501 that the outer equal cladding has fire-resistant insulation material layer, can keep apart intensification annealing section 4 and heat preservation annealing section 5, be convenient for respectively the controlled temperature, avoid the temperature to diffuse outward moreover, cause the heat energy loss.

In an embodiment of the present invention, as shown in fig. 1 to 3, the thin plate welding apparatus further includes a vibration mechanism 7, the vibration mechanism 7 is disposed between the heating annealing section 4 and the heat preservation annealing section 5, and the vibration mechanism 7 can drive the thin steel plate 9 to perform vibration aging treatment.

Specifically, as shown in fig. 3, the vibration mechanism 7 includes a vibration motor 701, a support end seat 702, a lower roller 703 and an upper roller 704, the thin steel plate 9 passes between the lower roller 703 and the upper roller 704, both ends of the lower roller 703 and the upper roller 704 are respectively mounted on the support end seat 702 through bearings, the vibration motor 701 is disposed on the support end seat 702, and the support end seat 702 is mounted on a side plate of the machine frame 1 through an elastic pad.

Specifically, as shown in fig. 3, the side plate of the frame 1 is provided with an outwardly protruding mount 102 at the position of the vibration mechanism 7, and the protruding end of the support end base 702 is connected to the mount 102 through a rubber spacer 706 and a bolt. The rubber pads 706 are capable of isolating vibrational forces.

Specifically, as shown in fig. 3, two ends of the lower roller shaft 703 are connected with a sliding block 7031 through a bearing, the sliding block 7031 is guided and slidably connected in a vertically arranged sliding groove at the inner end of the vertical plate of the support end seat 702, and a pressure spring 705 is installed between the lower surface of the sliding block 7031 and the bottom bearing plate of the support end seat 702.

Through set up vibrating mechanism 7 between intensification annealing section 4 and heat preservation annealing section 5, vibrating mechanism 7 passes through lower roll 703 and goes up the tight sheet steel 9 that passes through of roller 704 clamp, can drive sheet steel 9 and vibrate together, through selecting suitable vibration frequency, can be better get rid of welding residual stress through the vibration mode. The mode of vibratory stress relief and annealing heat treatment is simultaneously applied, the effect of removing welding stress can be driven to be superposed, pretreatment is made for the shaping process, and a relatively flat welded steel plate can be obtained.

The invention also provides a thin plate welding deformation prevention method, as shown in figure 4, the spliced thin steel plates in the conveying process can be welded, annealed after welding, and rolled and shaped after annealing. According to different materials of the welded thin steel plates, temperature setting of heating annealing and heat preservation annealing is carried out, and a better temperature curve is fitted.

Further, vibration aging treatment is carried out on the steel sheet in transmission in an annealing section. Through the mode of vibration, can further improvement stress release speed, improve production efficiency, the cooperation annealing heat treatment can reduce the heat treatment time, reduces energy consumption, obtains better economy and quality effect.

According to the sheet welding device, the annealing section is arranged between the primary pressing roll shaft 3 pair and the secondary pressing roll shaft 6 pair, so that the high-temperature heating annealing can be performed on the welded seam area of the sheet welded by the butt joint 2, the welding stress is reduced, and the welding deformation is reduced; the secondary flattening roller shaft 6 rolls the thin steel plate 9 with pressure again, so that the annealed steel plate can be flattened and shaped, and the flatness of the welded steel plate is ensured; and welding, annealing and shaping are all completed in the thin steel plate conveying process, so that the production efficiency is improved, and the labor is saved. The sheet welding device is suitable for continuous butt welding of longer sheets, can perform on-line heat treatment correction, can effectively reduce welding deformation, and improves welding quality and efficiency. In addition, the heating annealing section 4 and the heat preservation annealing section 5 are used for carrying out staged annealing on the area around the welding seam of the thin steel plate 9, an annealing heat treatment temperature curve is well fitted and set, and a good annealing stress-relief effect can be achieved; through the setting of first guard shield 401 and second guard shield 501 that the outer equal cladding has fire-resistant insulation material layer, can keep apart intensification annealing section 4 and heat preservation annealing section 5, be convenient for respectively the controlled temperature, avoid the temperature to diffuse outward moreover, cause the heat energy loss. Through set up vibrating mechanism 7 between intensification annealing section 4 and heat preservation annealing section 5, vibrating mechanism 7 passes through lower roll 703 and goes up the tight sheet steel 9 that passes through of roller 704 clamp, can drive sheet steel 9 and vibrate together, through selecting suitable vibration frequency, can be better get rid of welding residual stress through the vibration mode. The mode of vibratory stress relief and annealing heat treatment is simultaneously applied, the effect of removing welding stress can be driven to be superposed, pretreatment is made for the shaping process, and a relatively flat welded steel plate can be obtained.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the scope of the present invention is defined by the claims.

Claims

1. A sheet welding device is characterized in that: the device comprises a rack (1), a welding head (2), a primary pressing roller shaft (3), an annealing section, a secondary pressing roller shaft (6) and conveying rollers (8), wherein a plurality of conveying rollers (8) are parallelly erected on the rack (1), and the welding head (2), the primary pressing roller shaft (3), the annealing section and the secondary pressing roller shaft (6) are sequentially arranged on the rack (1) from a feeding end to a discharging end; the steel sheets (9) which need to be spliced and welded together are conveyed by the conveying rollers (8) to sequentially pass through the welding heads (2) to complete welding seam welding, pass through the pair of primary pressing roller shafts (3), are annealed at high temperature in the annealing section to remove stress, pass through the pair of secondary pressing roller shafts (6), and are conveyed to the blanking end.

2. The thin plate welding apparatus as set forth in claim 1, wherein: the annealing section includes intensification annealing section (4) and heat preservation annealing section (5), intensification annealing section (4) all are provided with a plurality of flame spray nozzles with heat preservation annealing section (5), the flame spray nozzle sets up both sides and injection head orientation about sheet steel (9) regional around the welding seam of sheet steel (9).

3. The thin plate welding apparatus as set forth in claim 2, wherein: the heating and annealing section (4) and the heat preservation and annealing section (5) are respectively provided with a first protective cover (401) and a second protective cover (501) facing the thin steel plate (9), and temperature sensors for measuring temperature are arranged in the first protective cover (401) and the second protective cover (501).

4. The thin plate welding apparatus as set forth in claim 3, wherein: the outer layers of the first shield (401) and the second shield (501) are coated with a fireproof heat-insulating material layer.

5. The thin plate welding apparatus as set forth in any one of claims 2 to 4, wherein: still include vibration mechanism (7), vibration mechanism (7) set up between intensification annealing section (4) and heat preservation annealing section (5), vibration mechanism (7) can drive sheet steel (9) carry out the vibration ageing.

6. The thin plate welding apparatus as set forth in claim 7, wherein: vibration mechanism (7) are including vibrating motor (701), support end seat (702), lower roller (703) and go up roller (704), steel sheet (9) are in pass through between lower roller (703) and the last roller (704), roller (703) and last roller (704) both ends are established through the bearing bracket respectively down support on end seat (702), be provided with on supporting end seat (702) vibrating motor (701), it installs to support end seat (702) through the cushion on the curb plate of frame (1).

7. The sheet welding apparatus according to claim 6, wherein: and a mounting table (102) is arranged on a side plate of the frame (1) at the position of the vibration mechanism (7), and the protruding end of the supporting end seat (702) is connected to the mounting table (102) through a rubber cushion block (706) by a bolt.

8. The thin plate welding apparatus as set forth in claim 7, wherein: the two ends of the lower roll shaft (703) are connected with sliding blocks (7031) through bearings, the sliding blocks (7031) are connected in sliding grooves which are vertically arranged at the inner ends of vertical plates of the supporting end seats (702) in a guiding and sliding mode, and pressure springs (705) are installed between the lower surfaces of the sliding blocks (7031) and bearing plates at the bottoms of the supporting end seats (702).

9. A deformation prevention method for thin plate welding is characterized in that: and welding the spliced thin steel plates in the conveying process, annealing after welding, and rolling and shaping after annealing.

10. The sheet welding deformation prevention method according to claim 9, wherein: and carrying out vibration aging treatment on the steel sheet in transmission in an annealing section.