Back door outer plate forming die

Abstract

The utility model belongs to the technical field of dies, and particularly relates to a back door outer plate forming die which comprises an upper die and a lower die, a male die is arranged on the lower die, a female die matched with the male die is arranged on the upper die, the upper surface of the male die is concaved downwards to form a groove, the edge of the groove and the upper surface of the male die form a convex R angle, a convex rib is arranged on the groove, and the convex rib is arranged on the upper surface of the male die. And the included angle alpha between the connecting line of the convex rib and the convex angle R and the upper surface of the convex die is greater than 160 degrees. According to the utility model, the bending and hardening of a material sheet at the ridge line are reduced, so that the lower surface of the material sheet is effectively prevented from being printed, and the formation of a slip line on the appearance surface of a product is effectively avoided.

Description

Technical field:

[0001] The utility model belongs to the technical field of molds, in particular to a back door outer panel forming mold. Background technology:

[0002] The structure of the rear outer panel of the car is as follows Figure 1 、 2 As shown, the mold comprises a body 1, which is provided with a notch 2 for mounting a taillight. The body 1 bulges outward at the notch 2, and a mating plate 3 is provided on the notch 2, which extends inward and fits the taillight. A convex R-angle is formed between the mating plate 3 and the body 1. During the forming process, the sharp edge shape (convex R-angle) of the lower die protrusion that forms the R-angle contacts the lower surface of the sheet. Under the contact pressure, the material is prone to bend hardening at the edge, resulting in an imprint at the R-angle of the edge on the lower surface of the sheet. As the drawing progresses, the material on both sides of the edge flows unevenly, and these imprints will eventually slide out of one side of the R-angle of the edge, resulting in a strip-shaped imprint that is almost parallel to the edge, that is, forming a slip line on the surface of the product, affecting the appearance of the finished product. Summary of the invention:

[0003] The purpose of the utility model is to provide a back door outer panel forming mold, which reduces the bending hardening of the material sheet at the edge line, thereby effectively preventing the generation of marks on the lower surface of the material sheet, thereby effectively avoiding the formation of slip lines on the appearance surface of the product.

[0004] The utility model is achieved in this way:

[0005] A back door outer panel forming mold includes an upper mold and a lower mold, the lower mold is provided with a punch, the upper mold is provided with a die that matches the punch, the upper surface of the punch is concave to form a groove, the edge of the groove forms a convex R angle with the upper surface of the punch, the groove is provided with a convex rib, and the angle α between the line connecting the convex rib and the convex R angle and the upper surface of the punch is greater than 160°.

[0006] In the above-mentioned back door outer panel forming mold, the upper surface of the convex rib and the two side surfaces are transitioned through an arc surface.

[0007] In the above-mentioned back door outer panel forming mold, the two side surfaces of the convex rib and the inner surface of the groove are transitioned through two arc surfaces respectively.

[0008] In the above-mentioned back door outer panel forming mold, the edge of the groove and the upper surface of the punch are transitioned through three arc surfaces.

[0009] In the above-mentioned back door outer panel forming mold, the depth of the groove gradually deepens from the inside to the outside, the height of the rib gradually increases from the inside to the outside, and the rib protrudes from the upper surface of the punch.

[0010] In the above-mentioned back door outer panel forming mold, the maximum width of the convex rib is 9 mm-11 mm, and the maximum height of the convex rib is 3.5 mm-4.5 mm.

[0011] The outstanding advantages of the utility model compared with the prior art are:

[0012] 1. The utility model provides a convex rib on the groove, and the angle α between the line connecting the convex rib and the convex R angle and the upper surface of the punch is greater than 160°, so that the angle between the sheet and the upper surface of the punch at the convex R angle is greater than 160°, reducing the surface contact pressure and alleviating the bending hardening of the sheet at the ridge line, thereby effectively preventing the generation of marks on the lower surface of the sheet, thereby effectively avoiding the formation of slip lines on the appearance of the product;

[0013] 2. The utility model has a three-way transition between the edge of the groove and the upper surface of the punch through an arc surface, which further prevents the generation of marks on the lower surface of the sheet, thereby effectively avoiding the formation of slip lines on the appearance of the product;

[0014] 3. The convex ribs of the present invention protrude from the upper surface of the punch, effectively supporting the sheet, thereby reducing surface contact pressure, alleviating bending hardening of the sheet at the ridges, and effectively preventing marks from being generated on the lower surface of the sheet, effectively avoiding the formation of slip lines on the appearance of the product. Description of the drawings:

[0015] Figure 1 It is a three-dimensional finished product of the back door outer panel of the utility model. Figure 1 ;

[0016] Figure 2 It is a three-dimensional finished product of the back door outer panel of the utility model. Figure 2 ;

[0017] Figure 3 It is a three-dimensional diagram of the lower mold of the utility model;

[0018] Figure 4 This is the CAE analysis diagram of the utility model;

[0019] Figure 5 It is a three-dimensional diagram of the back door outer panel after drawing of the utility model.

[0020] Figure numerals: 1, body; 2, notch; 3, matching plate; 11, lower die; 12, punch; 13, die; 14, groove; 15, convex R angle; 16, convex rib; 17, arc surface 1; 18, arc surface 2; 19, arc surface 3; 20, sheet. Specific implementation method:

[0021] The present invention is further described below with reference to specific embodiments. Figure 1 —5:

[0022] A back door outer panel forming mold includes an upper mold and a lower mold 11. The lower mold 11 is provided with a punch 12, and the upper mold is provided with a die 13 that matches the punch 12. The upper surface of the punch 12 is concave to form a groove 14. The edge of the groove 14 forms a raised rounded corner 15 with the upper surface of the punch 12. The groove 14 is provided with a raised rib 16. The angle α between the line connecting the raised rib 16 and the raised rounded corner 15 and the upper surface of the punch 12 is greater than 160 degrees. In this embodiment, the angle α between the line connecting the raised rib 16 and the raised rounded corner 15 and the upper surface of the punch 12 is 170 degrees.

[0023] The working principle of this utility model is as follows: Figure 3 、 4 As shown, the sheet 20 is placed on the lower die 11, the upper die moves downward, and the punch 12 and the die 13 cooperate to draw the sheet 20 into the required shape. The product after drawing is as shown in FIG. Figure 5 After the drawing, the product is then subjected to a subsequent stamping process, where the ribs 16 and grooves 14 of the sheet 20 are cut off to form a Figure 1 、 2 Notch 2 shown.

[0024] like Figure 3 、 4 As shown, the utility model provides a convex rib 16 on the groove 14, and the angle α between the line connecting the convex rib 16 and the convex R angle 15 and the upper surface of the punch 12 is greater than 160°, so that the angle between the sheet 20 and the upper surface of the punch 12 at the convex R angle is greater than 160°, reducing the surface contact pressure and alleviating the bending hardening of the sheet 20 at the ridge line, thereby effectively preventing the generation of marks on the lower surface of the sheet 20, thereby effectively avoiding the formation of slip lines on the appearance surface of the product.

[0025] Furthermore, the upper surface of the rib 16 and the two side surfaces are transitioned through arc surfaces 17 respectively.

[0026] Furthermore, the two side surfaces of the rib 16 and the inner surface of the groove 14 are transitioned through arc surfaces 18 .

[0027] In order to further prevent marks from being generated on the lower surface of the sheet 20 and thus effectively avoid the formation of slip lines on the appearance of the product, the edge of the groove 14 and the upper surface of the punch 12 are transitioned through an arc surface 19.

[0028] Furthermore, the depth of the groove 14 gradually increases from the inside out, and the height of the rib 16 gradually increases from the inside out. The rib 16 protrudes from the upper surface of the punch 12. The upper surface of the punch 12 refers to the upper surface of the punch 12 when the groove 14 is not provided. The provision of the rib 16 effectively supports the sheet 20, thereby reducing surface contact pressure and alleviating bending hardening of the sheet at the edge line, thereby effectively preventing the formation of marks on the lower surface of the sheet, and thus effectively avoiding the formation of slip lines on the product's appearance.

[0029] Preferably, the maximum width of the rib 16 is 9 mm to 11 mm, and the maximum height of the rib 16 is 3.5 mm to 4.5 mm. In this embodiment, the maximum width of the rib 16 is 10 mm, and the maximum height of the rib 16 is 4 mm.

[0030] The above embodiment is only one of the preferred embodiments of the present invention and is not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made based on the shape, structure, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A back door outer panel forming mold, characterized by: The invention comprises an upper die and a lower die (11), wherein the lower die (11) is provided with a punch (12), and the upper die is provided with a die (13) adapted to the punch (12). The upper surface of the punch (12) is concave to form a groove (14), and the edge of the groove (14) forms a convex R angle (15) with the upper surface of the punch (12). The groove (14) is provided with a convex rib (16), and the angle between the line connecting the convex rib (16) and the convex R angle (15) and the upper surface of the punch (12) is greater than 160°.

2. The back door outer panel forming mold according to claim 1, characterized in that: The upper surface of the convex rib (16) and the two side surfaces are transitioned through arc surface 1 (17).

3. The back door outer panel forming mold according to claim 1, characterized in that: The two side surfaces of the convex rib (16) and the inner surface of the groove (14) are transitioned via arc surfaces (18).

4. The back door outer panel forming mold according to claim 1, characterized in that: The edge of the groove (14) and the upper surface of the punch (12) are transitioned via a third arc surface (19).

5. The back door outer panel forming mold according to claim 1, characterized in that: The depth of the groove (14) gradually increases from the inside to the outside, the height of the rib (16) gradually increases from the inside to the outside, and the rib (16) protrudes from the upper surface of the punch (12).

6. The back door outer panel forming mold according to claim 1, characterized in that: The maximum width of the convex rib (16) is 9mm-11mm, and the maximum height of the convex rib (16) is 3.5mm-4.5mm.

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