A side A-pillar upper section transition surface shape

Abstract

A transition surface shape of the upper section of the side panel A-pillar comprises a first transition convex corner portion connected to the A-side of the upper section of the side panel A-pillar, a first transition concave corner portion connected to the bottom wall of the product, and a product side wall located between the first transition concave corner portion and the first transition convex corner portion, and also comprises a second transition convex corner portion; an angle θ2=θ+θ1 between the product side wall and the stamping direction; θ is 3‑5 degrees, and θ1 is less than or equal to 20°; a distance c between the end point of the second transition convex corner portion and the boundary of the A-side in the X-axis direction is 2‑3 mm; the first transition convex corner portion is an outward convex arc surface with a radius R1, wherein 2mm≤R1≤6mm: so that during the stamping process, the sheet metal position corresponding to the second transition convex corner portion contacts the mold first compared to the sheet metal position corresponding to the A-side, thereby making the sheet metal corresponding to the A-side contact the mold and avoiding the generation of defects during the drawing process.

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and in particular to a side A-pillar upper section transition surface shaping. Background Art

[0002] The side panel stamping is the most complex part of the entire body outer panel. It is large in size, complex in shape, has many exposed surfaces, and is very difficult to form. The A-surface of the upper section of the side panel A-pillar, as part of the exposed surface of the entire upper sill of the side panel, largely determines the aesthetics of the vehicle model.

[0003] During the stamping process of the body outer panel, local surface defects often form on the upper section A-side of the side A-pillar during the drawing process, and such surface defects are difficult to eliminate in subsequent processes, thereby increasing the defective rate of the body outer panel forming and increasing production costs. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a side A-pillar upper section transition surface shape that can avoid surface defects on the A-surface of the vehicle side A-pillar upper section.

[0005] The present invention proposes a transition surface shape for the upper section of the side A-pillar, comprising a first transition convex corner portion connected to the A-surface of the upper section of the side A-pillar, a first transition concave corner portion connected to the bottom wall of the product, and a product side wall located between the first transition concave corner portion and the first transition convex corner portion, and also comprising a second transition convex corner portion, the second transition convex corner portion starting at the termination boundary of the first transition convex corner portion, and the termination point of the second transition convex corner portion being located at the starting boundary of the product side wall; the angle θ2=θ+θ1 between the product side wall and the stamping direction; the θ is 3-5 degrees, and the θ1 is less than or equal to 20°; the distance c between the termination point of the second transition convex corner portion and the A-surface boundary in the X-axis direction is 2-3mm; the first transition convex corner portion is an outward convex arc surface with a radius R1, wherein 2mm≤R1≤6mm.

[0006] Preferably, the second transition convex corner portion includes a second transition section 1 and a second transition section 2, the starting point of the second transition convex corner portion is the starting point of the second transition section 1, and the starting point of the second transition section 2 is the termination boundary of the second transition section 1; the second transition section 1 is an inward concave arc surface with a radius R3, and the second transition section 2 is an outward convex arc surface with a radius R4; the distance a between the termination boundary of the second transition section 1 and the boundary of the A surface in the Z-axis direction is; wherein, a is 0.5-1mm, R3 is 10-15mm, and R4 is 3-5mm.

[0007] Preferably, the distance b between the connection between the first transition concave corner portion and the bottom wall of the product and the boundary of the A surface in the X-axis direction is less than 5 mm, and the first transition concave corner portion is an inward concave arc surface with a radius R5, and R5 is greater than R2.

[0008] As described above, the present invention relates to a side panel A-pillar upper section transition surface shaping, which has the following beneficial effects: by arranging a second transition convex corner portion between the first transition convex corner portion and the product side wall, the side wall stamping angle between the product side wall and the stamping direction is increased, so that the stamped product surface is appropriately increased; at the same time, during the stamping process, the sheet metal position corresponding to the second transition convex corner portion contacts the mold first compared to the sheet metal position corresponding to the A surface, so that the sheet metal corresponding to the A surface contacts the mold and no defects are generated during the drawing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a partial schematic diagram of a side A-pillar with a transition surface on the upper section of the side A-pillar according to the present invention.

[0010] Figure 2 This is a partial schematic diagram of another side A-pillar with a transition surface on the upper section of the side A-pillar according to the present invention.

[0011] Figure 3 for Figure 2 Magnified view of the mid-k region.

[0012] Figure 4 It is a cross-sectional schematic diagram of the transition surface molding of the upper section of the side A-pillar on a certain OXZ in the prior art.

[0013] Figure 5 It is a schematic cross-sectional view of a certain OXZ during the stamping of the transition surface of the upper section of the side A-pillar in the prior art.

[0014] Figure 6 It is a schematic cross-sectional view of a certain OXZ of the transition surface molding of the upper section of the side A-pillar in the present invention.

[0015] Figure 7 It is a schematic cross-sectional view of a certain OXZ during the stamping of the transition surface of the upper section of the side A-pillar in the present invention;

[0016] Figure 8 This is a rendering of the vehicle door outer panel in the present invention.

[0017] Figure 9 for Figure 8 Magnified view of the middle M region.

[0018] Description of reference numerals:

[0019] 100. Transition surface of the upper section of the side A-pillar; 110. A-surface; 111. Boundary of A-surface; 120. First transition convex corner; 121. Termination boundary of the first transition convex corner; 130. Second transition convex corner; 131. Second transition section one; 132. Second transition section two; 133. Termination boundary of the second transition section one; 140. Product side wall; 1401. Original product side wall; 1402. Current product side wall; 142. Termination boundary of the product side wall; 143. Starting boundary of the product side wall; 150. First transition concave corner; 151. Termination boundary of the first transition concave corner; 160. Product bottom wall; 200. Upper end surface of the front mounting end; 300. Front door opening; 400. Upper mold; 410. Lower mold; 420. Sheet material. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0021] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship, or adjustment in size should still fall within the scope of the technical contents disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantial changes in the technical contents. It should be noted that, if Figure 4 、 Figure 5 、 Figure 6 and Figure 7 The figure shows a cross-sectional schematic diagram of the shape of the upper transition surface 100 of the side A-pillar at a certain OXZ section. For the convenience of display, the thickness of the transition surface 100 is ignored, and the shape of the upper transition surface of the side A-pillar is directly shown by a curve.

[0022] like Figure 1 、 Figure 4 、 Figure 8 and Figure 9As shown, the upper section of the side A-pillar referred to in the present invention refers to the area of ​​the side A-pillar near the front mounting upper end surface 200 of the vehicle door. Specifically, the shape of the transition surface 100 of the upper section of the side A-pillar refers to the shape of the transition surface connecting the upper section A-surface 110 of the side A-pillar and the bottom wall 160 of the product, wherein the bottom wall 160 of the product is a part of the upper front mounting end surface 200 of the vehicle door outer panel, and the part of the upper front mounting end surface 200 is located between the side A-pillar and the corresponding front hole 300. The transition surface connecting the upper section A-surface 110 of the side A-pillar and the bottom wall 160 of the product includes a first transition convex corner portion 120, a product side wall 140, a first transition concave corner portion 150 and a product bottom wall 160; and the connection between the part of the front mounting end surface 200 and the first transition concave corner portion 150 is the termination boundary 151 of the first transition concave corner portion. Among them, Figure 1 The area outlined by the thick line shown in FIG. 1 is the side A-pillar upper transition surface 100 .

[0023] like Figure 4 As shown, more specifically, for the shape of the upper transition surface 100 of the side A-pillar in the prior art, the depth H between the A-surface boundary 111 and the product bottom wall 160 is 15 mm, the first transition convex corner portion 120 is an outward convex arc surface with a radius R1, where 2 mm ≤ R1 ≤ 6 mm; the first transition concave corner portion 150 is an inward concave arc surface with a radius R2, where 6 mm ≤ R2 ≤ 12 mm; the distance d between the termination boundary 151 of the first transition concave corner portion and the A-surface boundary 111 in the X-axis direction is greater than 5 mm; the sidewall 140 of the product is stamped in the stamping direction at an angle of 0° ≤ θ1 ≤ 20°. The product sidewall 140 and the first transition convex corner portion 120 are tangent at the product sidewall starting boundary 143; and the product sidewall 140 and the first transition concave corner portion 150 are tangent at the product sidewall termination boundary 142.

[0024] Among them, such as Figure 5 The figure shows the process of stamping the sheet material 420 in the prior art. The arrow indicates the direction of stamping of the upper die 400. For ease of understanding, the sheet material 420 corresponding to the A surface 110 and the first transition convex corner 120 is attached to the lower die 410. The sheet material 420 to be stamped into the product side wall 140 is partially suspended. During the process of locally squeezing the sheet material 420, it is easy to cause the sheet material 420 in the first transition convex corner area 120 to bulge, thereby causing defects in the A surface 110. Figure 5 A defect occurs in the A area.

[0025] like Figure 2-Figure 3 、 Figure 6 and Figure 7As shown, an embodiment of the transition surface shaping of the upper section of the side A-pillar of the present invention includes a first transition convex corner portion 120 connected to the A-surface 110 of the upper section of the side A-pillar, a first transition concave corner portion 150 connected to the product bottom wall 160, a product side wall 140 located between the first transition concave corner portion 150 and the first transition convex corner portion 120, and a second transition convex corner portion 130, the second transition convex corner portion 130 starts at the termination boundary 121 of the first transition convex corner portion, and the termination point of the second transition convex corner portion 130 is located at the starting boundary 143 of the product side wall; the angle θ2 between the product side wall 140 and the stamping direction is θ+θ1; θ is 3-5 degrees, and θ1 is less than or equal to 20°; the distance c between the termination point of the second transition convex corner portion 130 and the A-surface boundary 111 in the X-axis direction is 2-3 mm; the first transition convex corner portion 120 is an outward convex arc surface with a radius R1, wherein 2mm≤R1≤6mm.

[0026] Among them, the starting point and the ending point refer to the starting point and the end point of each part such as the first transition convex corner portion 120, the second transition convex corner portion 130, the product side wall 140, the first transition concave corner portion 150 and the product bottom wall 160 when the transition surface shape of the upper section of the side A-pillar extends from the A-surface boundary 111 toward the product bottom wall 160. It is only for the convenience of expression.

[0027] The increase of the side wall punching angle θ2 relative to θ1 makes the punching product surface appropriately enlarged, and in the process of punching the sheet metal, Figure 5 As shown, at this time, the sheet material 420 corresponding to the A surface 110, the first transition convex corner portion 120, and the second transition convex corner portion 130 is attached to the lower die 410, and the sheet material 420 to be punched into the product side wall 140 is partially suspended. During the stamping process, the sheet material 420 corresponding to the second transition convex corner portion 130 provided in this embodiment is positioned relative to the sheet material 420 corresponding to the A surface 110 so that it can first contact the upper die 400, thereby avoiding the impact of the forming of the sheet material 420 at the product side wall 140 on the forming of the sheet material 420 at the A surface 110 during the stamping process. As a result, the sheet material 420 corresponding to the A surface 110 will not produce defects during the contact and drawing process with the die. Specifically, compared to directly punching a sheet material without the second transition convex corner portion 130, the sheet material 420 corresponding to the A surface 110 has a reduced thinning rate during stamping, with the principal strain greater than 0 and the secondary strain greater than 0.

[0028] like Figure 3 、 Figure 6 and Figure 7Preferably, the second transition convex corner portion 130 includes a second transition section 1 131 and a second transition section 2 132. The starting point of the second transition convex corner portion 130 is the starting point of the second transition section 1 130, and the starting point of the second transition section 2 132 is the second transition section 1 termination boundary 133; the second transition section 1 131 is an inward concave arc surface with a radius R3, and the second transition section 2 132 is an outward convex arc surface with a radius R4; the distance a between the second transition section 1 termination boundary 133 and the A-surface boundary 111 in the Z-axis direction is; wherein, a is 0.5-1mm, R3 is 10-15mm, and R4 is 3-5mm. In this embodiment, a, R3 and R4 are adjusted within this range. During the stamping process, it can be ensured that the sheet material position corresponding to the second transition convex corner portion 130 (specifically, the second transition section 2 132) is in contact with the upper die first compared to the sheet material position corresponding to the A surface 110. During the partial extrusion of the sheet material 420 to be stamped into the product side wall 140, the second transition section 2 132 of the second transition convex corner portion 130 may be arched, while the second transition section 1 130 adjacent thereto is a concave arc surface, which just absorbs the defects of this part of the product. Figure 7 As shown in the B area, the generation of the defect of the A surface 110 is finally avoided.

[0029] The distance b between the junction of the first transition concave corner 150 and the bottom wall 140 and the A-surface boundary 111 in the X-axis direction is 3-5 mm. The first transition concave corner 150 is an inwardly concave arc with a radius R5, where R5 is greater than R2. By matching the sizes of b and R5, cracking caused by an excessively large distance between the bottom wall 160 and the A-surface boundary 111 in the upper section of the A-pillar in the door side can be avoided, while cracking during the drawing process caused by a too-small radius R5 of the first transition concave corner 151 can also be avoided.

[0030] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A side panel A-pillar upper section transition surface shape, comprising a first transition convex corner portion (120) connected to the side panel A-pillar upper section A surface (110), a first transition concave corner portion (150) connected to the product bottom wall (160), and a product side wall (140) located between the first transition concave corner portion (150) and the first transition convex corner portion (120), characterized in that: It also includes a second transition convex corner portion (130), the starting point of the second transition convex corner portion (130) is located at the termination boundary (121) of the first transition convex corner portion, and the termination point of the second transition convex corner portion (130) is located at the starting boundary (143) of the product side wall; the angle θ2=θ+θ1 between the product side wall (140) and the stamping direction; the θ is 3-5 degrees, and the θ1 is less than or equal to 20 degrees; the distance c between the termination point of the second transition convex corner portion (130) and the A-surface boundary (111) in the X-axis direction is 2-3 mm; the first transition convex corner portion (120) is an outward convex arc surface with a radius R1, wherein 2 mm ≤ R1 ≤ 6 mm; the second transition convex corner portion (130) includes The second transition section 1 (131) and the second transition section 2 (132), the starting point of the second transition convex corner portion (130) is the starting point of the second transition section 1 (131), and the starting point of the second transition section 2 (132) is the termination boundary (133) of the second transition section 1; the second transition section 1 (131) is an inner concave arc surface with a radius of R3, and the second transition section 2 (132) is an outer convex arc surface with a radius of R4; the distance a between the termination boundary (133) of the second transition section 1 and the boundary of the A surface (111) in the Z-axis direction; wherein a is 0.5-1mm, R3 is 10-15mm, and R4 is 3-5mm; the Z-axis direction is the stamping direction of the mold, and the X-axis direction is the front-back direction of the mold.

2. The side A-pillar upper transition surface molding according to claim 1, characterized in that: The distance b between the connection point between the first transition concave corner portion (150) and the product bottom wall (160) and the A-surface boundary (111) in the X-axis direction is less than 5 mm, and the first transition concave corner portion (150) is an inwardly concave arc surface with a radius R5, and R5 is greater than R2; wherein, 6mm≤R2≤12mm.

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