CN111677323A - Repair structure and construction method of compartment sandwich panel - Google Patents
Repair structure and construction method of compartment sandwich panel Download PDFInfo
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- CN111677323A CN111677323A CN202010547484.7A CN202010547484A CN111677323A CN 111677323 A CN111677323 A CN 111677323A CN 202010547484 A CN202010547484 A CN 202010547484A CN 111677323 A CN111677323 A CN 111677323A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0296—Repairing or restoring facades
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Abstract
The invention discloses a repairing structure of a compartment sandwich board, which comprises a core material, a first skin and a second skin, wherein the first skin and the second skin are respectively laid on two sides of the core material in the thickness direction, the first skin is a metal skin, the repairing structure comprises a repairing hole formed in the compartment sandwich board, the repairing hole is formed by cutting the first skin towards the core material along the thickness direction of the compartment sandwich board, the repairing hole does not penetrate through the second skin, a filling block is filled in the repairing hole, a repairing skin covers the repairing hole, the repairing skin is made of the same material as the first skin, and the repairing skin is welded on the first skin; the filling block is formed by cutting the same material as the core material. The application also discloses a construction method of the repairing structure. By utilizing the method and the device, the repairing process can be effectively simplified, the safety of the repairing structure is improved, and the waterproof performance is improved.
Description
Technical Field
The invention relates to a repair structure and a construction method of a compartment sandwich panel.
Background
The compartment sandwich board is of a sandwich structure and generally comprises a metal skin, a frame, a core material, an adhesive and the like with the thickness of 0.6-1.5 mm, when the compartment sandwich board is manufactured and actually used, the compartment sandwich board is damaged due to the factors of recess, damage, staggered holes caused by misoperation or external force, hole re-opening or new equipment installation increase and the like, and the damaged part needs to be repaired to recover the integrity of the compartment sandwich board and ensure the normal use of the compartment sandwich board.
At present, the repairing method for the damaged part adopts the following steps: (1) protecting the periphery of the area needing to be repaired of the compartment sandwich panel, cutting off the skin of the repaired area according to a square hole, removing damaged foam to form a hole, then plugging foam tape rubber with the same size into the hole, and filling and leveling to ensure that the foam surface of the repaired surface is smooth; (2) cutting metal strips on site according to the size of the hole and plugging the metal strips to the periphery of the hole; (3) fixing the metal strip and the periphery of the skin by rivets; (4) and pressing the skin with glue at the opening, fixing with a rivet, sealing with glue, and repairing paint.
The damaged part can be repaired by adopting the repairing method, but the following defects still exist:
(1) the process is complicated: the processes of metal strip feeding, metal strip plugging, drilling, riveting and the like are needed, so that the repairing work is low in efficiency and long in time consumption.
(2) The hidden danger is great: after the rivet is used for a long time, the rivet head is easy to protrude out of the surface of the sandwich panel, so that the fisheye problem is caused, and the appearance and the performance are influenced; the sealing compound is easy to crack due to thermal expansion and cold contraction; the material is easy to crack under vibration after being used for a long time;
(3) poor waterproof performance: the rivets around the skin are more, so that the skin is easy to loosen after a long time, and the water leakage condition may exist.
Disclosure of Invention
In order to solve at least part of the problems, the invention firstly provides a repairing structure of a compartment sandwich panel, and by utilizing the repairing structure, the repairing process can be effectively simplified, the safety of the repairing structure is improved, and the waterproof performance is improved. The specific technical scheme is as follows:
a repair structure of a compartment sandwich panel comprises a core material, a first skin and a second skin, wherein the first skin and the second skin are respectively laid on two sides of the core material in the thickness direction, the first skin is a metal skin, the repair structure comprises a repair hole formed in the compartment sandwich panel, the repair hole is formed by cutting the first skin towards the core material along the thickness direction of the compartment sandwich panel, the repair hole does not penetrate through the second skin, a filling block is filled in the repair hole, a repair skin covers the repair hole, the repair skin is made of the same material as the first skin, and the repair skin is welded on the first skin; the filling block is formed by cutting the same material as the core material. Wherein the repair hole is formed by the first skin and the core material which are cut off together. Preferably the repair skin has a thickness of 0.6-0.8 mm.
In the repairing structure, the scheme of fixing metal strips by rivets, which is conventionally used at present, is cancelled, the repairing skin is fixed on the compartment sandwich panel by adopting a laser welding mode, the heat release amount of the laser welding is small, the metal deformation amount of a welding seam is small, the repairing skin can be basically still in a flat state, the cracking phenomenon can not be generated, and the sealing property of the repairing position is ensured. Because the rivet is not used any more, the phenomenon that the rivet head protrudes out of the compartment sandwich panel due to expansion with heat and contraction with cold is avoided, and the attractiveness of the repaired part is ensured.
The repairing structure can be used for repairing the first skin which is made of metal materials, such as the skin repairing of a compartment sandwich panel of which the first skin is an aluminum plate, a carbon steel plate or a stainless steel plate.
Furthermore, in order to ensure that the filling block can be stably connected to the compartment sandwich board, the outer peripheral surface of the filling block is attached to the inner peripheral surface of the repair hole, and the filling block and the repair hole are bonded together by adopting an adhesive.
Further, the filling block is provided with an outer side surface facing away from the second skin, and the outer side surface is 0.2-0.3mm lower than the outer surface of the first skin. The design can avoid the outward convex phenomenon of the repair skin due to the supporting effect of the filling blocks, not only influences the beauty of the repair area, but also can cause the repair skin to generate internal stress under the long-term supporting effect to influence the safe use of the repair skin. The gap between the outer side face of the filling block and the outer surface of the first skin is used for filling adhesive.
Furthermore, the filling block and the repairing skin are bonded together by adopting an adhesive, and no adhesive is arranged between the repairing skin and the first skin. The adhesive enables the repairing skin to be bonded on the filling block, and meanwhile, when the adhesive is filled between the repairing skin and the first skin, the protruding height of the repairing skin relative to the first skin can be reduced, the situation that a higher protruding part is formed on the carriage sandwich board to influence the normal use of the carriage sandwich board is avoided, and particularly when equipment needs to be installed in a repairing area of the box sandwich board is avoided.
In order to ensure the connection strength of the repairing skin, the overlapping width of the repairing skin and the first skin is 5-10 mm.
Further, in the repairing hole, buried iron is installed on one side, facing the second skin, of the filling block. After the buried iron is installed, other equipment can be additionally arranged in the repairing area.
Secondly, the application also provides a construction method for the repair structure of the compartment sandwich panel, the construction method is used for realizing the repair structure in each technical scheme, and the construction method specifically comprises the following steps:
(1) cutting a hole, namely cutting the part, needing to be repaired, of the compartment sandwich board according to a rectangle, peeling off the cut first skin, cutting off the corresponding core material to form a rectangular repairing hole, inserting a filling block with the outer surface coated with an adhesive into the repairing hole, and enabling the filling block to abut against the bottom surface of the repairing hole; the part needing to be repaired is a damaged part or a part needing to be additionally provided with the iron-burying part, and the damaged part can be just formed by additionally providing the iron-burying part.
After the repairing hole is formed, the edge of the opening of the first skin needs to be polished to remove burrs, and the welding position of the first skin needs to be subjected to surface treatment, specifically, paint and a plating layer at the welding position are polished completely;
(2) coating an adhesive on the bonding surface of the repair skin, and then covering the bonding surface of the repair skin on the repair hole; when the adhesive is coated, the distance between the adhesive and the edge of the repaired skin is 10-30 mm; i.e. no adhesive is coated in the area which is 10-30mm away from the edge of the skin patch; the painted adhesive is extruded and cannot penetrate between the repairing skin and the first skin;
the peripheral edge of the repairing skin is also polished smoothly, and the area of the bonding surface opposite to the repairing hole is polished to be rough and clean so as to facilitate bonding; surface treatment is also carried out on the welding area for repairing the skin, and paint and a plating layer in the welding area are polished completely;
(3) clamping the repairing skin on the compartment sandwich plate by using a tool, and then welding the repairing skin on the first skin by adopting a laser welding mode;
the first skin is an aluminum plate, a carbon steel plate or a stainless steel plate, when the first skin is the aluminum plate, the thickness of the first skin is 0.8-1.2mm, and the welding power is 1.27-1.43 kw; when the first skin is a carbon steel plate or a stainless steel plate, the thickness of the first skin is 0.6-2mm, and the welding power is 0.90-1.05 kw;
parameters during laser welding:
swing displacement: controlling the thickness to be 1.5-2.0 mm;
type of shielding gas: industrial argon is adopted, and the purity is more than or equal to 99.999 percent;
welding moving speed: 1.0-1.2 m/min;
and (3) welding operation: the method comprises the following steps of positioning and welding:
positioning: firstly, positioning and repairing the position of the skin by using intermittent welding, wherein the length of a welding line is controlled to be 6-20mm, and the distance is 60-100 mm;
welding: moving a welding gun along the gap by inclining the welding gun head by 40-50 degrees, and fusing the repairing skin and the first skin together;
(4) curing, namely curing the adhesive after welding is finished, wherein the curing thickness of the adhesive is 0.2-0.3 mm;
during curing, the adhesive is cured by adopting a normal-temperature curing, radiation heating curing or heat transfer heating mode;
when normal temperature curing is adopted, the curing time is 5-24 h;
when radiation heating curing is adopted, the curing time is 3-5 h;
when heat transfer heating is used for curing, the curing time is 1-2 h.
When radiation heating curing is adopted, a baking lamp or a heater called a small sun can be adopted. When the heat transfer heating solidification is adopted, heating sheets such as silicon rubber electric heating sheets can be adopted, and the existing electric heating sheets can meet the requirements of the application and are not repeated. The above methods can be selected according to the size of the composite sandwich plate and the required construction progress. The repair area of 200mm × 200mm or less is preferably cured by heat transfer heating.
When the construction method is adopted to finish the repair of the structure, the repair skin is directly welded with the first skins around the repair hole by adopting the laser welding technology, metal strips and corresponding rivets are not needed, the construction efficiency can be effectively improved and the construction time can be saved during construction.
Compared with argon arc welding and carbon dioxide gas shielded welding, the laser welding has the advantages of small heat release, small metal deformation at a welding seam, high welding strength, attractive surface of the skin after repair and no cracking.
The construction method can be used for welding the first skin of the compartment plate sandwich plate which is made of metal materials, and the first skin can be specifically made of plates such as aluminum plates, carbon steel plates or stainless steel plates. During laser welding, the first skin and the repairing skin are melted and bonded together, so that the sealing performance between the repairing skin and the first skin is ensured, and the waterproof performance is good.
Further, in order to ensure the bonding strength and avoid the influence of an excessively thick adhesive on the construction efficiency, in the step (2), when the adhesive is coated on the bonding surface of the repaired skin, the coating amount of the adhesive is 0.3-0.8kg/m3. Under the condition of the coating amount of the adhesive, the connection strength between the repairing skin and the first skin can be ensured, the flow of the adhesive which is not controlled can be avoided, the setting time can be delayed by the excessively thick adhesive, and the construction efficiency is not favorably improved.
Further, in the step (2), when the viscosity of the adhesive is 2000-3500mPa.s and the temperature is 40 ℃, after the coating is finished, curing is carried out, and the repairing skin is adhered to the compartment sandwich panel 15-30min before the gel. The adhesive with the viscosity is a conventional adhesive, has good construction performance, and needs to be adhered to the compartment sandwich panel 15-30min before gelation in order to ensure the bonding effect. In addition, the adhesive is liquid and has strong fluidity, and when the compartment sandwich panel is in a vertical state, the adhesive is easier to flow downwards, so that the extra protection workload needs to be increased to prevent the adhesive from entering between the repairing skin and the first skin, the adhesive is cured after the coating of the adhesive is finished, the viscosity of the adhesive can be increased, the fluidity of the adhesive is reduced, no adhesive exists between the repairing skin and the first skin, and the welding quality of the repairing skin and the first skin is ensured.
Drawings
Fig. 1 is a schematic structural view of an embodiment of a repair structure of a compartment sandwich panel.
Fig. 2 is a schematic view of the car body sandwich panel after the opening of the repair hole is completed.
Fig. 3 is a schematic view after the iron insert is installed in the repair hole.
FIG. 4 is a schematic view of the filler block filled in the repair hole and the bonding of the repair skin is completed.
Fig. 5 is a schematic view of the repair skin and the first skin as they are welded.
Fig. 6 is a schematic view when curing is performed.
Detailed Description
First, a repairing structure of the car sandwich panel will be described below.
In fig. 1, an arrow M marked at an appropriate position indicates the thickness direction of the car sandwich panel 10.
Referring to fig. 1, the compartment sandwich panel 10 includes a core material 11, and a first skin 12 and a second skin 13 respectively laid on two sides of the core material 11 in a thickness direction, where the first skin 12 is a metal skin, and specifically in this embodiment, the first skin is made of an aluminum plate with a thickness of 1.2 mm. And a frame 15 is embedded in the core material 11.
The repairing structure comprises a repairing hole 19 formed in the compartment sandwich board 10, wherein the repairing hole 19 is formed by cutting the first skin towards the core material along the thickness direction of the compartment sandwich board, namely, the repairing hole 19 comprises a hole formed in the first skin and a hole formed in the core material 11, and the repairing hole 19 does not penetrate through the second skin 13.
The filling blocks 22 are filled in the repairing holes 19, a repairing skin 21 covers the repairing holes 19, the material of the repairing skin is the same as that of the first skin, the repairing skin is also made of an aluminum plate, and the repairing skin 21 is welded on the first skin 12. It will be appreciated that in other embodiments, when the first skin is made of a carbon steel plate or a stainless steel plate, the repair skin is also made of the same material, i.e. a carbon steel plate or a stainless steel plate.
In this embodiment, the thickness of the repair skin is 0.8 mm. It will be appreciated that the thickness of the repair skin may also be 0.6 or 0.7mm in other embodiments. The filler block 22 is cut out of the same material as the core material 11.
The outer peripheral surface of the filler block 22 is bonded to the inner peripheral surface of the repair hole 19 by an adhesive. The filling block 22 has an outer side surface 221 facing away from the second skin 13, the outer side surface 221 is 0.2mm lower than the outer surface 121 of the first skin 12, so that an adhesive accommodating cavity is formed between the outer side surface 221 of the filling block 22 and the repair skin, and the extra outward pressure of the filling block on the repair skin due to the supporting effect of the adhesive is reduced.
The filling block and the repairing skin are bonded together by adopting an adhesive, and no adhesive is arranged between the repairing skin and the first skin. In this embodiment, the overlapping width L of the repair skin and the first skin is 7 mm.
Since the repair site in this embodiment is opposite to the frame 15 and needs to be supplemented with buried iron, in this embodiment, a buried iron 23 is installed on the side of the filling block 22 facing the second skin 13 and supported on the frame 15.
It is understood that in other embodiments, when it is not necessary to add the buried iron, the buried iron may be eliminated and the filler block may be directly abutted against the bottom surface of the repair hole.
Of course, the repair holes may also be provided in areas where the frame is absent, but where there is damage.
The following is a description of the construction method of the above-described repaired structure.
The construction method comprises the following steps:
(1) cutting a hole, referring to fig. 2, cutting the rectangular part of the compartment sandwich panel 10 to be repaired, peeling off the cut first skin, cutting off the corresponding core material to expose the frame 15, and cleaning the exposed surface of the frame to form a rectangular repairing hole 19. Referring to fig. 3, the adhesive coated embedded iron 23 is then placed in the repair hole 19 and bonded to the frame 15, and screws or rivets may be used to fix the embedded iron to the frame according to different requirements.
Referring to fig. 4, a filling block 22 with an adhesive coated on the outer surface is inserted into the repair hole 19, and the filling block abuts against the embedded iron 23. It will be appreciated that in other embodiments, the filler block rests directly against the bottom surface of the repair hole when no buried iron is required.
(2) Continuing to refer to fig. 4, an adhesive is applied on the bonding surface of the repair skin 21, and then the bonding surface of the repair skin is covered on the repair hole; when the adhesive is coated, the coating amount of the adhesive is 0.6kg/m3The distance between the adhesive and the edge of the repair skin is 15 mm; to avoid adhesive flowing between the repair skin and the first skin when the repair skin is compressed.
In the embodiment, the viscosity of the adhesive is 3000mPa.s, the temperature is 40 ℃, after the coating is finished, the curing is carried out, and the repairing skin is adhered to the compartment sandwich board 20min before the gelation.
(3) Referring to fig. 5, the repair skin is clamped to the car sandwich panel by a tooling 50 and then welded to the first skin by a laser welder. In this embodiment, the fixture 50 includes a clamping plate 51, and the clamping plate 51 is pressed against the repair skin and pressed against the compartment sandwich panel through the repair skin.
In the embodiment, the first skin and the repair skin are both made of aluminum plates, and the welding power is 1.35 kw. Immediately, in other embodiments, when the first skin and the repair skin are both made of aluminum plates, the welding power may also be 1.27, 1.39, or 1.43 kw.
It is understood that in other embodiments, when the first skin and the repair skin are both made of carbon steel plates or stainless steel plates, the welding power is 0.90, 0.95, 1.00 or 1.05 kw.
In the application, the first skin is an aluminum plate, a carbon steel plate or a stainless steel plate, when the first skin is the aluminum plate, the thickness of the first skin is 0.8-1.2mm, and the welding power is 1.27-1.43 kw; when the first skin is a carbon steel plate or a stainless steel plate, the thickness of the first skin is 0.6-2mm, and the welding power is 0.90-1.05 kw;
parameters during laser welding:
oscillation displacement of the laser welder: controlling the thickness to be 1.7 mm;
type of shielding gas: industrial argon is adopted, and the purity is more than or equal to 99.999 percent;
welding moving speed: 1.1 m/min;
and (3) welding operation: the method comprises the following steps of positioning and welding:
positioning: firstly, the position of the covering is positioned and repaired by using intermittent welding, the length of a welding line is controlled to be 12mm, and the interval is 80 mm;
welding: and (4) inclining the welding gun head 30 by 45 degrees, moving the welding gun along the gap, and fusing the repairing skin and the first skin together.
(4) Referring to fig. 6, in this embodiment, heat transfer heating is used for curing, and the curing time is 1.5 h. During curing, the silicon rubber heating sheet 40 is attached to one side of the compartment sandwich board with the repaired skin, the repaired skin is covered, then the compartment sandwich board is heated at 50-65 ℃ to cure the adhesive, and the curing thickness of the adhesive is 0.2 mm. In fig. 6, reference numeral 41 denotes a power supply line of the silicone rubber heating sheet 40.
It is understood that in other embodiments, the adhesive may be cured by normal temperature curing or radiation heating curing. When normal temperature curing is adopted, the curing time is 5-24 h. When radiation heating curing is adopted, the curing time is 3-5h, and when radiation heating curing is carried out, a baking lamp or a heater called a small sun can be adopted.
Claims (10)
1. A repairing structure of a compartment sandwich board is characterized in that the compartment sandwich board comprises a core material, a first skin and a second skin, wherein the first skin and the second skin are respectively laid on two sides of the core material in the thickness direction, the first skin is a metal skin, the repairing structure comprises a repairing hole formed in the compartment sandwich board, the repairing hole is formed by cutting the first skin towards the core material along the thickness direction of the compartment sandwich board, the repairing hole does not penetrate through the second skin, a filling block is filled in the repairing hole, a repairing skin covers the repairing hole, the repairing skin is made of the same material as the first skin, and the repairing skin is welded on the first skin;
the filling block is formed by cutting the same material as the core material.
2. The repair structure according to claim 1, wherein the outer peripheral surface of the filler block is bonded to the inner peripheral surface of the repair hole by an adhesive.
3. The repair arrangement according to claim 1, wherein the filling block has an outer side facing away from the second skin, the outer side being 0.2-0.3mm lower than the outer surface of the first skin.
4. The repair construction of claim 1, wherein the filler blocks are bonded to the repair skin with an adhesive and wherein there is no adhesive between the repair skin and the first skin.
5. The repair structure of claim 1, wherein the repair skin has a thickness of 0.6 to 0.8 mm.
6. The repair structure of claim 1, wherein the width of the overlap of the repair skin and the first skin is 5-10 mm.
7. The repair construction of claim 1, wherein in the repair hole, a buried iron is installed at a side of the filling block facing the second skin.
8. The construction method for repairing the structure of the compartment sandwich panel according to any one of the claims 1 to 7, comprising the following steps:
(1) cutting a hole, namely cutting the part, needing to be repaired, of the compartment sandwich board according to a rectangle, peeling off the cut first skin, cutting off the corresponding core material to form a rectangular repairing hole, inserting a filling block with the outer surface coated with an adhesive into the repairing hole, and enabling the filling block to abut against the bottom surface of the repairing hole;
(2) coating an adhesive on the bonding surface of the repair skin, and then covering the bonding surface of the repair skin on the repair hole; when the adhesive is coated, the distance between the adhesive and the edge of the repaired skin is 10-30 mm;
(3) clamping the repairing skin on the compartment sandwich plate by using a tool, and then welding the repairing skin on the first skin by adopting a laser welding mode;
the first skin is an aluminum plate, a carbon steel plate or a stainless steel plate, when the first skin is the aluminum plate, the thickness of the first skin is 0.8-1.2mm, and the welding power is 1.27-1.43 kw; when the first skin is a carbon steel plate or a stainless steel plate, the thickness of the first skin is 0.6mm-2mm, and the welding power is 0.90-1.05 kw;
parameters during laser welding:
swing displacement: controlling the thickness to be 1.5-2.0 mm;
type of shielding gas: industrial argon is adopted, and the purity is more than or equal to 99.999 percent;
welding moving speed: 1.0-1.2 m/min;
and (3) welding operation: the method comprises the following steps of positioning and welding:
positioning: firstly, positioning and repairing the position of the skin by using intermittent welding, wherein the length of a welding line is controlled to be 6-20mm, and the distance is 60-100 mm;
welding: moving a welding gun along the gap by inclining the welding gun head by 40-50 degrees, and fusing the repairing skin and the first skin together;
(4) curing, namely curing the adhesive after welding is finished, wherein the curing thickness of the adhesive is 0.2-0.3 mm;
during curing, the adhesive is cured by adopting a normal-temperature curing, radiation heating curing or heat transfer heating mode;
when normal temperature curing is adopted, the curing time is 5-24 h;
when radiation heating curing is adopted, the curing time is 3-5 h;
when heat transfer heating is used for curing, the curing time is 1-2 h.
9. The construction method according to claim 8,
in the step (2), when the adhesive is coated on the bonding surface of the repaired skin, the coating amount of the adhesive is 0.3-0.8kg/m3。
10. The construction method according to claim 8,
in the step (2), when the viscosity of the adhesive is 2000-3500mPa.s and the temperature is 40 ℃, curing is carried out after finishing coating, and the repairing skin is adhered to the compartment sandwich panel 15-30min before gelation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010547484.7A CN111677323A (en) | 2020-06-16 | 2020-06-16 | Repair structure and construction method of compartment sandwich panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010547484.7A CN111677323A (en) | 2020-06-16 | 2020-06-16 | Repair structure and construction method of compartment sandwich panel |
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| Publication Number | Publication Date |
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| CN111677323A true CN111677323A (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010547484.7A Pending CN111677323A (en) | 2020-06-16 | 2020-06-16 | Repair structure and construction method of compartment sandwich panel |
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| Country | Link |
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| CN (1) | CN111677323A (en) |
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2020
- 2020-06-16 CN CN202010547484.7A patent/CN111677323A/en active Pending
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