Method for eliminating deformation of metal plate of side apron of automobile

Abstract

According to the method for eliminating deformation of the automobile side apron sheet metal, the normal-temperature curing modified acrylic acid bi-component AB glue is smeared on the male die at the center position of the skirt edge of the inner die of the side wall outer plate or the cloth-based adhesive tape is pasted, so that the punched side wall outer plate forms an arch-shaped molded surface at the skirt edge position, the yield strength of the outer plate at the skirt edge position is improved, and the service life of the side wall outer plate is prolonged. Therefore, the side wall outer plate does not have thermal deformation after being heated by a coating process. The side body outer plate inner die coated with the AB glue can continuously punch 10000 side body outer plates without deformation and displacement, the side body outer plate inner die pasted with the cloth-based adhesive tape can continuously punch 1000 side body outer plates without deformation and displacement, the cost is extremely low, the punched side body outer plates form an arch-shaped molded surface of 0.6 mm at the skirt edge position, and the side body outer plate inner die can be used for continuously punching the side body outer plates without deformation and displacement. The yield strength of the outer plate at the skirt edge position is improved, and thermal deformation does not occur any more after the outer plate is heated through a coating process.

Description

Technical Field

[0001] The invention relates to the technical field of automobile body-in-white production, and in particular to a method for eliminating sheet metal deformation of an automobile side skirt. Background Art

[0002] The white body chassis of electric vehicles is more complicated than that of fuel vehicles due to the addition of battery packs. In order to ensure the collision safety of the battery pack, more ultra-high-strength hot-formed steel is added to the chassis, and the inner and outer panel structures at the skirt position become more complicated, forming a three-layer panel structure. Figure 1 As shown, when the body in white is baked in the paint shop, the hot-formed steel plate 200 inside the skirt position is difficult to be heated, resulting in a lower temperature and a smaller expansion, while the outer plate 100 at the skirt position is easily heated, resulting in a higher temperature and a larger expansion; this excessive temperature difference between the inner and outer plates of the skirt eventually causes the compressive stress of the outer plate to reach the yield stress at the weak point of the outer plate, resulting in sheet metal deformation.

[0003] In view of the above problems, the inventors of the present invention finally obtained the present invention after a long period of research and practice. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a simple and low-cost method for eliminating the deformation of the sheet metal of the automobile side skirt.

[0005] The technical solution adopted by the present invention is:

[0006] A scheme provides a method for eliminating sheet metal deformation of a car side skirt, by applying room temperature curing modified acrylic two-component AB glue on the punch at the center position of the skirt of the inner mold of the side outer panel, so that the stamped side outer panel forms an arched surface at the skirt position, thereby improving the yield strength of the outer panel at the skirt position, so that the side outer panel will no longer be thermally deformed after being heated by a coating process.

[0007] Furthermore, the application size of the room temperature curing modified acrylic two-component AB glue is: 20 cm in length, 8 cm in width, and 1.6 mm in thickness.

[0008] Furthermore, after applying the glue, wait for the adhesive to cross-link and cure, and after curing, use P1200 sandpaper to lightly polish it until it is smooth.

[0009] Furthermore, the arch height of the arched profile is 0.6 mm.

[0010] Another solution provides a method for eliminating sheet metal deformation of a car side skirt. By sticking cloth-based tape on the punch at the center position of the skirt of the inner mold of the side outer panel, the stamped side outer panel forms an arched surface at the skirt position, thereby increasing the yield strength of the outer panel at the skirt position, so that the side outer panel no longer undergoes thermal deformation after being heated by a coating process.

[0011] Furthermore, the dimensions of the cloth-based tape to be pasted are: 20 cm in length, 8 cm in width, and 2 mm in thickness.

[0012] Furthermore, the arch height of the arched profile is 0.6 mm.

[0013] The method for eliminating deformation of sheet metal of automobile side skirt of the present invention changes the profile on the punch at the center position of the skirt of the inner mold of the side outer panel, thereby changing the surface profile of the outer panel at the skirt position of the body-in-white, thereby improving the yield strength of the outer panel and eliminating the deformation of the heated sheet metal during the painting process. The method is simple and low-cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 A schematic diagram of the inner and outer plate structure of the current electric vehicle side skirt edge position is shown;

[0016] Figure 2 A schematic diagram showing the application position of the acrylic two-component AB glue according to an embodiment of the present invention;

[0017] Figure 3 A schematic diagram showing the position of the arched profile of the side outer panel according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0018] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0019] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] In the present invention, unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] The current method to solve the problem of deformation of the skirt of the side outer panel when it is baked in the paint shop is: 1. Paste a strength gasket inside the skirt of the side outer panel; 2. Change the shape of the skirt of the side outer panel to form a reinforcing rib structure; 3. Add a bottom nozzle to the coating PVC drying furnace to improve the heating effect of the inner panel, reduce the temperature difference between the inner and outer panels, and reduce the degree of sheet metal deformation; 4. Apply S30 welding black glue inside the skirt of the side outer panel. Method 1 will increase the cost of a bicycle by more than 2 yuan, which is too expensive. Method 2 requires redesign and modification of the mold shape, and the investment cost exceeds one million. Method 3 cannot completely eliminate sheet metal deformation, and sheet metal deformation quality defects still exist. Method 4 requires investment in a new gluing robot, and the investment exceeds one million.

[0022] The above methods all start from improving the side outer panel itself, which is complex, costly or unable to solve the technical problems. The solution of the present invention takes a different approach and changes the surface profile of the inner mold of the side outer panel to meet the requirements of batch stamping at a very low cost and eliminate the deformation of the skirt sheet metal.

[0023] Example 1

[0024] like Figure 2 , Figure 3 As shown, in this embodiment, a method for eliminating deformation of sheet metal of a side skirt of an automobile is provided, comprising the following steps:

[0025] Step 1: Evenly apply a room temperature curing modified acrylic two-component AB glue 2 with a length of 20 cm, a width of 8 cm, and a thickness of 1.6 mm on the central position of the convex mold 1 at the inner mold skirt of the side panel outer panel of the automobile side panel forming process 5;

[0026] Step 2: Wait for 10 minutes for the adhesive to cross-link and solidify, then use P1200 sandpaper to lightly polish it;

[0027] Step 3: Use the side panel outer panel inner mold coated with acrylic two-component AB glue to batch stamp the side panel outer panels 3.

[0028] After long-term use, it has been verified that the inner mold of the side outer panel coated with acrylic two-component AB glue can continuously stamp 10,000 side outer panels without deformation and displacement, and only requires the investment of less than 40 yuan of acrylic AB glue. The stamped side outer panel 3 forms a 0.6mm arched surface 4 at the skirt position, which improves the yield strength of the outer panel at the skirt position, and no thermal deformation occurs after heating through the coating process.

[0029] Example 2

[0030] In this embodiment, a method for eliminating deformation of sheet metal of a side skirt of an automobile is provided, comprising the following steps:

[0031] Step 1: Paste a cloth-based tape with a length of 20 cm, a width of 8 cm, and a thickness of 2 mm on the central position of the convex mold of the inner skirt of the side panel outer panel of the automobile side panel forming process 5;

[0032] Step 2: Use the side panel inner mold with the cloth-based tape attached to perform batch stamping of the side panel outer panels.

[0033] After long-term use, it has been verified that the inner mold of the side outer panel with cloth-based tape can continuously punch 1,000 side outer panels without deformation and displacement, and only the cost of the gray cloth-based tape of less than 10 yuan is required. The punched side outer panel forms a 0.6mm arched surface at the skirt position, which improves the yield strength of the outer panel at the skirt position, and no thermal deformation occurs after heating in the coating process.

[0034] Compared with the solution of Example 1, since the cloth-based tape is easily deformed after continuous punching, the tape needs to be replaced after every 1,000 side outer panels are punched, and the risk of other quality accidents caused by tape displacement cannot be ruled out. Therefore, the solution of Example 1 is a more preferred solution, which can continuously punch 10,000 side outer panels without deformation and displacement.

[0035] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. The structures and connection modes of the components in the present invention can be changed, and any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A method for eliminating deformation of sheet metal of automobile side skirt, characterized in that: By applying room temperature curing modified acrylic two-component AB glue on the punch at the center position of the skirt of the inner mold of the side outer panel, the stamped side outer panel forms an arched surface at the skirt position, thereby improving the yield strength of the outer panel at the skirt position, so that the side outer panel will no longer experience thermal deformation after being heated through the coating process.

2. A method for eliminating deformation of a car side skirt sheet metal as claimed in claim 1, characterized in that: The application size of the room temperature curing modified acrylic two-component AB glue is: 20 cm in length, 8 cm in width, and 1.6 mm in thickness.

3. The method for eliminating deformation of sheet metal of automobile side skirt as claimed in claim 1, characterized in that: After applying the glue, wait for the adhesive to cross-link and cure. After curing, use P1200 sandpaper to lightly polish it until it is smooth.

4. The method for eliminating deformation of sheet metal of automobile side skirt as claimed in claim 1, characterized in that: The arch height of the arched profile is 0.6 mm.

5. A method for eliminating deformation of sheet metal of automobile side skirt, characterized in that: By sticking cloth-based tape on the punch at the center of the skirt edge of the inner mold of the side outer panel, the stamped side outer panel forms an arched surface at the skirt edge position, thereby improving the yield strength of the outer panel at the skirt edge position, so that the side outer panel will no longer be thermally deformed after being heated through the coating process.

6. A method for eliminating deformation of sheet metal of a side skirt of an automobile as claimed in claim 5, characterized in that: The dimensions of the cloth-based tape used for pasting are: 20 cm in length, 8 cm in width, and 2 mm in thickness.

7. A method for eliminating deformation of a car side skirt sheet metal as claimed in claim 5, characterized in that: The arch height of the arched profile is 0.6 mm.

Images