Automobile sheet sealing folding and folding method

Abstract

The application relates to the field of automobile plate engineering technology and discloses a kind of automobile plate sealing flanging and flanging method.It includes: including inner plate, outer plate, flanging glue and sealant;The outer plate includes bottom plate and the bending plate connected with the bottom plate, the cavity between the bottom plate and the bending plate, the cavity includes first wall, second wall and third wall, the inner plate is inserted into the cavity, the first wall and the second wall are connected with the inner plate by flanging glue;The end of the bending plate is provided with the sealant connected with the inner plate;The inner plate, the third wall and the sealant are collectively enclosed to form a vent hole, and the vent hole is in communication with the outside air.By adjusting the distance between the coating position of the flanging glue and the bending plate, the flanging glue after bending on this side does not contact the sealant, thereby forming a vent hole, and the gas inside the flanging close to the sealant can be directly discharged to the air through the vent hole after being heated, so that no glue bubble is generated on the sealant.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile sheet metal engineering, in particular to an automobile sheet metal sealing folding and a folding method. Background Art

[0002] To maintain the sealing properties of automotive body panels, isolate them from external moisture, dust, and smoke, and provide corrosion resistance, noise reduction, and aesthetically pleasing hems, sealant is typically applied to the hems of doors and hoods. The body gluing process is a crucial step in ensuring the corrosion resistance, airtightness, and watertightness of automotive body panels. However, in actual production, the sealant covering the hem welds is prone to localized bulging after baking, forming PVC bubbles. PVC bubbles typically occur at the hems of the four doors and two hoods. Since these areas are often directly visible to users, the presence of bubbles not only affects the appearance, but also creates holes when the bubbles rupture, leading to poor sealing and leakage or rust. Summary of the Invention

[0003] The purpose of the present invention is to provide a sealing folding method for automobile sheet materials, so as to solve the problem that when the air cannot be discharged due to the existence of an independent closed cavity in the existing folding, the gas in the cavity is baked and expanded by heat, causing the sealant to bulge and produce PVC bubbles.

[0004] In order to achieve the above-mentioned objectives, the present invention provides a sealed folding edge of an automobile plate, which includes an inner plate, an outer plate, folding glue and a sealant; the outer plate includes a bottom plate and a bent plate connected to the bottom plate, a cavity is provided between the bottom plate and the bent plate, the cavity includes a first wall, a second wall and a third wall, the inner plate is inserted into the cavity, and the first wall and the second wall are connected to the inner plate by the folding glue; the end of the bent plate is provided with a sealant connected to the inner plate; the inner plate, the third wall and the sealant together enclose a vent hole, and the vent hole is connected to the outside air.

[0005] Furthermore, the inner plate is further provided with an extension section, and the extension section gradually moves away from the outer plate outward from the inner plate.

[0006] Furthermore, the extension section is provided with a clamping section.

[0007] Furthermore, the width of the gap between the inner plate and the outer plate ranges from 0.3 mm to 1 mm.

[0008] Furthermore, the diameter of the sealant ranges from 3 mm to 9 mm.

[0009] The present invention also provides a method for manufacturing a sealed folded edge of an automobile plate, which is characterized by comprising the following steps:

[0010] S1. Apply the hemming glue on the bottom plate. The diameter of the hemming glue is in the range of 2 mm to 4 mm. The distance between the hemming glue and the bending plate is a, 10 mm ≤ a ≤ 14 mm.

[0011] S2. The inner panel contacts and squeezes the hemming glue, causing the hemming glue to flow toward both sides of the contact line between the inner panel and the inner panel. The bent panel bends around the inner panel and the hemming glue, and the hemming glue is squeezed and flows toward the bent panel, thereby bonding the bottom panel to the inner panel, and bonding the bent panel to the inner panel.

[0012] S3. Apply the sealant between the bent plate and the inner plate along the end edge of the bent plate.

[0013] Furthermore, during the coating process, the hemming glue is led out through a glue guide tube, and the diameter of the inner wall of the glue guide tube ranges from 2 mm to 4 mm.

[0014] Furthermore, the angle between the extension direction of the hemming glue and the hemming line of the bending plate is α, and α is ≤10°.

[0015] Furthermore, the angle between the bent plate and the inner plate is β, and β is ≤ 5°.

[0016] Compared with the prior art, the sealing folding of automobile plates and the folding method of the present invention have the following beneficial effects: by adjusting the distance between the coating position of the folding glue and the bending plate, and adopting the method of extruding the folding glue, the folding glue is deformed along the inner wall of the cavity, and the deformed folding glue maintains a distance from the end of the bending plate, and finally the sealing glue is applied to the end of the bending plate, so that a vent hole connected to the outside is formed inside the cavity, and when the gas inside the folding close to the sealant is heated, it can be directly discharged to the air through the vent hole without squeezing the sealant, so that no bubbles are generated on the sealant. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of the sealed folded edge of an automobile sheet according to an embodiment of the present invention;

[0018] Figure 2 This is a front view of the hem glue coating position before the hem of the automobile plate is sealed and folded according to an embodiment of the present invention;

[0019] Figure 3 This is a top view of the hem glue coating position before the hem is sealed on the automobile sheet according to an embodiment of the present invention;

[0020] Figure 4 This is a front view of the inner panel installed in the sealing and hemming method of the automobile panel according to the embodiment of the present invention;

[0021] Figure 5This is a front view of step S2 in the sealing and hemming method for automobile sheet materials according to an embodiment of the present invention;

[0022] In the figure, 1, outer plate; 11, bottom plate; 12, bent plate; 121, folding line; 2, inner plate; 21, extension section; 3, folding glue; 4, sealant; 5, cavity; 51, first wall; 52, second wall; 53, third wall; 6, vent. DETAILED DESCRIPTION

[0023] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0024] like Figure 1 As shown, a sealed folding edge of an automobile plate according to a preferred embodiment of the present invention includes an inner plate 2, an outer plate 1, folding glue 3 and a sealant 4; the outer plate 1 includes a bottom plate 11 and a bending plate 12 connected to the bottom plate 11, and a cavity 5 is provided between the bottom plate 11 and the bending plate 12, and the cavity 5 includes a first wall 51, a second wall 52 and a third wall 53, the first wall 51 is located on the plate surface of the bottom plate 11 close to the bending plate 12, the second wall 52 is located on the bending arc surface of the bending plate 12, and the third wall 53 is located on the plane of the bending plate 12, the inner plate 2 is inserted into the cavity 5, and the first wall 51 and the second wall 52 are connected to the inner plate 2 by the folding glue 3; the end of the bending plate 12 is provided with a sealant 4 connected to the inner plate 2; the inner plate 2, the third wall 53 and the sealant 4 together enclose a vent 6, and the vent 6 is connected to the external air.

[0025] Based on this, in the sealed fold of the automobile sheet material of this embodiment, the sealant 4, the inner panel 2, the third wall 53 and the sealant 4 together form a vent 6, and the vent 6 is connected to the outside air. The gas inside the fold close to the sealant 4 can be directly discharged into the air through the vent 6 after being heated, so that no bubbles will be generated on the sealant 4.

[0026] Further, if Figure 1 As shown, to facilitate the rapid insertion of the inner panel 2 into the cavity 5 without causing the clamp holding the inner panel 2 to contact the outer panel 1, the inner panel 2 is further provided with an extension section 21. The extension section 21 gradually moves outward from the inner panel 2 away from the outer panel 1. The design of the extension section 21 increases the distance between the end face of the inner panel 2 and the outer panel 1, thereby increasing the movable space of the clamp. To facilitate the clamp holding the inner panel 2, the extension section 21 is provided with a clamping section (not shown in the figure).

[0027] Furthermore, the width of the gap between the inner panel 2 and the outer panel 1 is in the range of 0.3 mm to 1 mm, and this width range provides good bonding strength for the hemming glue 3 to bond the outer panel 1 and the inner panel 2 .

[0028] Furthermore, the diameter of the sealant 4 ranges from 3 mm to 9 mm. This range ensures that under the conditions of the gap width between the inner panel 2 and the outer panel 1, the sealant 4 will neither overflow too much to make the folding edge unsightly nor overflow too little to cause sealing failure.

[0029] A preferred embodiment of the present invention further provides a method for manufacturing a sealing fold of an automobile plate, the method comprising the following steps:

[0030] S1, such as Figure 2-3 As shown, the hemming glue 3 is coated on the bottom plate 11, the diameter of the hemming glue 3 is in the range of 2mm to 4mm, and the distance between the hemming glue 3 and the bending plate 12 is a, 10mm≤a≤14mm; when the hemming glue 3 is coated, the distance between it and the bending plate 12 has a great influence on the flow distance of the subsequent hemming glue 3 being squeezed and flowing. The above-mentioned coating position distance can ensure that the hemming glue 3 is squeezed and flows toward the bending plate 12, while the hemming glue 3 will neither overflow nor be squeezed to the tail end of the bending plate 12. The sealant 4 and the hemming glue 3 are in a non-contact state to avoid the formation of closed pores;

[0031] S2, such as Figure 5 As shown, the inner panel 2 contacts and squeezes the hemming glue 3, causing the hemming glue 3 to flow to both sides of the contact line between the inner panel 2 and the inner panel 2. The bent panel 12 bends around the inner panel 2 and the hemming glue 3. The hemming glue 3 is squeezed and flows toward the bent panel 12, bonding the bottom panel 11 to the inner panel 2, and bonding the bent panel 12 to the inner panel 2.

[0032] S3, such as Figure 1 As shown, the sealant 4 is applied between the bent plate 12 and the inner plate 2 along the end edge of the bent plate 12 .

[0033] Furthermore, during the coating process, the hemming glue 3 is drawn out through a glue guide tube (not shown in the figure). The inner wall diameter of the glue guide tube ranges from 2mm to 4mm, which is the same as the diameter of the hemming glue. The glue guide tube is provided with a roller that rolls along the surface of the bending plate. The rolling direction of the roller is the same as the extension direction of the hemming glue. The radius of the roller is the same as the distance between the hemming glue and the bending plate. The roller can be used to position and determine the distance between the glue guide tube and the bending plate.

[0034] Furthermore, in order to prevent the flow distance difference of the hemming glue 3 at each position during the hemming process from being too large and affecting the hemming yield, the angle between the extension direction of the hemming glue 3 and the hemming line 121 of the bending plate 12 is α, and α≤10°.

[0035] Furthermore, in order to ensure that a good sealing effect can be achieved by using less sealant 4 and reduce the probability of sealing failure, the angle between the bending plate 12 and the inner plate 2 is β, and the β≤5°. The smaller the angle between the bending plate 12 and the inner plate 2, the smaller the gap at the sealing point, which is more conducive to the sealant 4 to seal the folded edge.

[0036] In summary, an embodiment of the present invention provides a sealing folding and folding method for an automobile plate. By adjusting the distance between the coating position of the folding glue 3 and the bending plate 12, and adopting the method of extruding the folding glue 3, the folding glue 3 is deformed along the inner wall of the cavity 5, and the deformed folding glue 3 maintains a distance from the end of the bending plate 12. Finally, sealant 4 is coated on the end of the bending plate 12, so that an air vent 6 connected to the outside is formed inside the cavity 5. When the gas inside the fold close to the sealant 4 is heated, it can be directly discharged to the air through the vent 6 without squeezing the sealant 4, so that no bubbles are generated on the sealant 4.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A sealing folding edge for automobile sheet material, characterized in that: It includes an inner plate, an outer plate, hemming glue and a sealant; the outer plate includes a bottom plate and a bending plate connected to the bottom plate, a cavity is provided between the bottom plate and the bending plate, the cavity includes a first wall, a second wall and a third wall, the inner plate is inserted into the cavity, the first wall and the second wall are connected to the inner plate by hemming glue; the end of the bending plate is provided with a sealant connected to the inner plate; the inner plate, the third wall and the sealant together enclose a vent, and the vent is connected to the outside air; the angle between the extension direction of the hemming glue and the hemming line of the bending plate is α, and the α is ≤10°, and the angle between the bending plate and the inner plate is β, and the β is ≤5°.

2. The automobile sheet sealing folding edge according to claim 1, characterized in that: The inner plate is further provided with an extension section, and the extension section gradually moves away from the outer plate outward from the inner plate.

3. The automobile sheet sealing folding edge according to claim 2, characterized in that: The extension section is provided with a clamping section.

4. The automobile sheet sealing folding edge according to claim 1, characterized in that: The width of the gap between the inner plate and the outer plate ranges from 0.3 mm to 1 mm.

5. The automobile sheet sealing folding edge according to claim 1, characterized in that: The diameter of the sealant ranges from 3 mm to 9 mm.

6. A hemming method for manufacturing the sealed hem of an automobile sheet material according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Apply the hemming glue on the bottom plate. The diameter of the hemming glue is in the range of 2 mm to 4 mm. The distance between the hemming glue and the bending plate is a, 10 mm ≤ a ≤ 14 mm. S2. The inner panel contacts and squeezes the hemming glue, causing the hemming glue to flow toward both sides of the contact line between the inner panel and the inner panel. The bent panel bends around the inner panel and the hemming glue, and the hemming glue is squeezed and flows toward the bent panel, thereby bonding the bottom panel to the inner panel, and bonding the bent panel to the inner panel. S3. Apply the sealant between the bent plate and the inner plate along the end edge of the bent plate.

7. The hemming method according to claim 6, characterized in that: During the coating process, the hemming glue is led out through a glue guide tube, and the diameter of the inner wall of the glue guide tube ranges from 2 mm to 4 mm.

8. The hemming method according to claim 6, characterized in that: The angle between the extending direction of the hemming glue and the hemming line of the bending plate is α, and α is ≤ 10°.

9. The hemming method according to claim 6, characterized in that: The angle between the bent plate and the inner plate is β, and β is ≤ 5°.

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