Stamping and drawing forming process and stamping process of automobile suspension support plate

Abstract

The present application discloses a stamping and drawing forming process and a stamping process for an automobile suspension support plate, and relates to the technical field of stamping. The stamping and drawing forming process comprises: first drawing forming, the height of a primary punch is a part of the height of the first convex structure, a primary parting line is the intersection line of the convex side wall and the primary pressing surface of the pressure ring, the outside of the primary parting line is the primary pressing surface, and a primary drawing rib is located at the outer circle of the overall structure; second drawing forming, the surface of a secondary punch is the overall structure of the part, a secondary parting line is located at the outer circle of the overall structure, the outside of the secondary parting line is the secondary pressing surface of the pressure ring, and a secondary drawing rib is located at the same position as the primary drawing rib. By adopting the drawing process scheme, i.e., drawing out a part of the convex structure first, and then drawing out the whole structure, the problems of drawing cracking of large and deep convex structures, small and deep convex structures, and sharp convex structures can be effectively solved.

Description

Technical Field

[0001] This invention relates to the field of stamping technology, and more specifically, to a stamping and drawing forming process and a stamping process for automotive suspension support plates. Background Technology

[0002] The automotive body-in-white is mainly composed of stamped parts welded together. The shapes of these stamped parts vary, and they are mostly three-dimensional structures, with some parts having relatively complex shapes. Stamping is mainly achieved through processes such as drawing / forming, trimming and punching, and flanging and shaping.

[0003] For stamped parts formed by drawing, the process mainly includes three parts: punch, blank holder, and die. The punch surface is consistent with the shape of the product. During stamping, the blank holder and the die work together to press the blank around its perimeter. As the press gradually descends, the blank is formed by the punch.

[0004] In existing drawing die forming processes, the punch is internally located inside the blank holder, with the parting line being the intersection of the punch sidewall and the blank holder surface. For parts with shallow depth and large top and bottom corner radii (i.e., large width-to-height ratio), this can be achieved in a single drawing operation. However, when the part is deep, has sharp features, and small corner radii, a single drawing operation will result in cracking and cannot achieve the desired result. Furthermore, when the blank holder surface has shaped features, it will hinder the flow of sheet metal during the forming process, resulting in a large peripheral blank holder area, which is not conducive to the successful drawing of the part.

[0005] Therefore, how to provide a method to solve the problem of cracking in a single direct drawing process when the stamped part is deep, has sharp features, and has small upper and lower corner radii has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to provide a method that can solve the problem of cracking during direct drawing and forming of stamped parts that are deep, have sharp features, and have small upper and lower corner radii.

[0007] According to a first aspect of the present invention, a stamping and drawing forming process is provided, the method comprising:

[0008] Step 1: Perform the first drawing forming. The height of the first punch is part of the height of the first punch structure. The first parting line is the intersection of the side wall of the punch and the first blank holder surface of the blank holder ring. The outer side of the first parting line is the first blank holder surface. The first draw bead is located on the outer ring of the overall structure.

[0009] Step 2: Perform a second drawing process. The secondary convex mold surface is the overall structure of the part. The secondary parting line is located on the outer ring of the overall structure. The outer side of the secondary parting line is the secondary blank holder surface of the blank holder. The secondary draw bead is in the same position as the primary draw bead.

[0010] Optionally, when the radius of the rounded corners on the first convex hull structure is less than a preset value, and the first convex hull structure exhibits a pointed structure, step 1 further includes:

[0011] The first convex hull structure is deformed by moving the side wall surface of the first convex hull structure upward to form a new convex hull surface, and then the top junction is rounded to form the primary punch.

[0012] Optionally, the sheet metal inside the secondary parting line can provide a certain amount of material flow supplement for the forming of the secondary punch.

[0013] According to a second aspect of the present invention, a stamping process for an automotive suspension support plate is provided, comprising:

[0014] Step 1: Perform the first drawing forming. The base plane is the first pressing surface. The intersection line of the second convex structure and the base plane is extended by a preset distance as the transition zone for material storage and subsequent secondary reverse drawing deformation. The extended line is the first parting line. The outside of the first parting line is the first pressing surface.

[0015] Step 2: Perform a second rolling forming, using the intersection line of the third convex hull structure and the base surface as the secondary parting line, the third convex hull structure as the secondary punch, and the outer side of the secondary parting line as the secondary blanking surface, and perform reverse drawing forming.

[0016] Step 3: Adjust the stamping direction so that the arc-shaped sidewall of the axial section forms an angle with the stamping direction, and perform flanging on the upper half of the arc-shaped sidewall; wherein, the interior of the first parting line is a third convex hull mechanism with a reverse cutting surface that is gentler than the second convex hull structure and has a larger chamfer than the second convex hull structure.

[0017] Optionally, it also includes: step 21, removing the surrounding waste material after the drawing is completed.

[0018] Optionally, it also includes: step 4, shaping the bottom of the arc-shaped sidewall, adjusting the stamping direction again so that the arc-shaped sidewall of the axial section forms a second angle with the stamping direction, shaping the lower half of the arc-shaped sidewall, and the resulting part is the arc-shaped sidewall structure.

[0019] Optionally, the preset distance is 15-20mm.

[0020] Optionally, the first included angle is 3 degrees and the second included angle is 13 degrees.

[0021] According to the technical content disclosed in this invention, the following beneficial effects are achieved: By adopting a drawing process, namely, first drawing a portion of the convex structure, then drawing it a second time, and finally drawing the entire structure, the problems of cracking during drawing of large and deep convex structures, cracking of small and deep convex structures, and cracking of convex structures with sharp shapes can be effectively solved. Regarding the wrinkling problem of the tapered arc-shaped sidewall surface of the rear suspension support plate of an automobile forming an acute angle with the base surface, a process of first drawing a portion of the rounded corner surface, then flanging half of the sidewall surface at the second included angle, and finally shaping the remaining portion, effectively solves the wrinkling problem.

[0022] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0024] Figure 1 This is a schematic diagram of the first drawing process in a stamping drawing forming process according to an embodiment;

[0025] Figure 2 This is a schematic diagram of the second drawing process in a stamping drawing forming process according to an embodiment;

[0026] Figure 3 This is a schematic diagram comparing the die surfaces of the first drawing and the second rolling processes in a stamping and drawing forming process according to an embodiment;

[0027] Figure 4 This is a schematic diagram of the first drawing process in another stamping drawing process provided according to an embodiment;

[0028] Figure 5 This is a schematic diagram of the second drawing process in another stamping drawing forming process provided according to the embodiment;

[0029] Figure 6 This is a schematic diagram comparing the die surfaces of the first drawing and the second rolling processes in another stamping and drawing forming process provided according to an embodiment;

[0030] Figure 7 This is a schematic diagram of the structure of the rear suspension support plate in the stamping process of the automotive suspension support plate according to the embodiment;

[0031] Figure 8 This is a schematic diagram of the first drawing process in the stamping process of the automotive suspension support plate according to the embodiment;

[0032] Figure 9 This is a schematic diagram of the second drawing process in the stamping process of the automotive suspension support plate according to the embodiment;

[0033] Figure 10 This is a comparative schematic diagram of the first and second drawing processes in the stamping process of the automotive suspension support plate according to the embodiment;

[0034] Figure 11 This is a schematic diagram of the trimming process in the stamping process of the automotive suspension support plate according to the embodiment;

[0035] Figure 12 This is a schematic diagram of the flanging process (after flanging) in the stamping process of the automotive suspension support plate according to the embodiment;

[0036] Figure 13 This is a comparative schematic diagram of the forming and flanging processes in the stamping process of the automotive suspension support plate according to the embodiment.

[0037] Explanation of reference numerals in the attached drawings: 1-Primary punch a, 2-Primary parting line a, 3-Primary blank holder surface a, 4-Primary draw bead a, 5-Secondary punch a, 6-Secondary parting line a, 7-Secondary blank holder surface a, 8-Secondary draw bead a, 9-Primary blank holder surface b, 10-Primary parting line b, 11-Secondary parting line b, 12-Secondary punch b, 13-Secondary blank holder surface b, 14-Trimming line b, 15-Flanging b, 16-Primary punch b, 17-Flanging parting line b, 18-Shaping surface b, 19-Automotive rear suspension support plate. Detailed Implementation

[0038] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0039] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0040] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0041] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0043] Reference Appendix Figure 1 - Appendix Figure 3 According to a first aspect of the present invention, a stamping and drawing forming process is provided, the process comprising:

[0044] Step 1: Perform the first drawing forming. The height of the first punch a1 is part of the height of the first punch structure. The first parting line a2 is the intersection of the punch sidewall and the first blanking surface a3 of the blanking ring. The first blanking surface a3 is outside the first parting line a2. The first drawing bead a4 is located on the outer ring of the overall structure.

[0045] Step 2: Perform the second drawing process. The secondary punch b5 is the overall structure of the part. The secondary parting line a6 is located on the outer ring of the overall structure. The outer side of the secondary parting line a6 is the secondary blank holder surface a7. The secondary draw bead a8 is in the same position as the primary draw bead a4.

[0046] Specifically, when stamping a part with a relatively large and deep first convex hull structure, and relatively large upper and lower corner radii, as well as a large planar portion around the perimeter, two drawing processes are required. To avoid cracking, the drawing depth is reduced in the first drawing process. The primary punch a1 is part of the height of the first convex hull structure, and its primary parting line a2 is the intersection of the sidewall of the first convex hull structure and the primary blank holder surface a3 of the blank holder ring. The outer side of the primary parting line a2 is the primary blank holder surface a3. To reduce the resistance of the sheet metal feeding during the first drawing process, the primary blank holder surface a3 is designed as a smooth or flat surface. The primary draw bead a4 is designed on the outer ring of the overall structure. In the second drawing process, the punch surface is the entire structure of the part, i.e., the entire first convex hull structure plus the planar portion. The secondary parting line a6 is designed on the outer ring of the overall structure of the part, and the outer side of the secondary parting line a6 is the secondary blank holder surface a7 of the blank holder ring. At this point, during the second forming, the sheet metal inside the parting line can provide some material flow supplement for the forming of the punch and bulge, preventing cracking. The positions of the draw beads are the same for the first and second drawing. This design is because the radius of the rounded corner on the first bulge structure is relatively large. By reducing the drawing depth, a portion is drawn first, and then the entire structure is drawn.

[0047] Further, see attached document. Figure 4 - Appendix Figure 6When the fillet radius of the first convex hull structure is smaller than the preset value, and the circumferential area of ​​the first convex hull structure is large and the shape is complex (i.e., the first convex hull structure has a pointed structure), and the part has high structural strength requirements, the above-mentioned single-stage drawing process is prone to cracking. Therefore, during the first drawing, the first convex hull structure is deformed by moving the side wall surface of the first convex hull structure upwards with the stamping direction downwards to form a new convex hull surface. Then, the top junction is rounded to form a primary punch a1, and then a secondary drawing is performed through step 2 above. The rounded corner at the top junction increases the contact area between the sheet metal and the punch during the forming process, improving the problem of cracking caused by the large contact stress due to the original small radius.

[0048] Reference Appendix Figure 7 To be continued Figure 13 According to a second aspect of the present invention, a stamping process for an automotive suspension support plate is provided, comprising: Step 1, performing a first drawing forming, wherein the base plane is a primary blanking surface b9, and the intersection line of the second convex structure and the base plane is extended outward by a predetermined distance as a transition zone for material storage and subsequent secondary reverse drawing deformation, the extended line being a primary parting line b10, and the outer side of the primary parting line b10 being the primary blanking surface b9; Step 2, performing a second rolling forming, wherein the intersection line of the third convex structure and the base plane is a secondary parting line b11, and the third convex structure is a secondary punch b12, wherein the... The outer side of the secondary parting line b11 is the secondary blanking surface b13, which is used for reverse drawing. Step 21: After drawing, the peripheral waste is removed. After drawing, the peripheral waste is removed along the trimming line b14. Step 3: Adjust the stamping direction so that the arc-shaped sidewall of the axial section forms a first angle with the stamping direction, and perform the flanging b15 of the upper part of the arc-shaped sidewall. Step 4: Shape the bottom of the arc-shaped sidewall, adjust the stamping direction again so that the arc-shaped sidewall of the axial section forms a second angle with the stamping direction, and perform the shaping of the lower part of the arc-shaped sidewall. After shaping, it becomes the arc-shaped sidewall structure of the part.

[0049] Specifically, the automotive suspension support plate uses high-strength steel, and its structure has a second convex structure with a small bottom area in the middle. Furthermore, the rounded corners of this second convex structure are small, leading to cracking during single-draw forming. Due to the small width-to-height ratio, the process provided in the first aspect will also cause cracking, and there is a high risk of interference during stamping and wrinkling during forming, affecting vehicle assembly. In addition, the sidewall of the rear suspension support plate part 19 is a tapered arc-shaped sidewall with an acute included angle, which causes wrinkling at the lower part of the tapered area during forming. In this scheme, during the first drawing, the base plane is used as the primary blanking surface b9. A preset distance of approximately 15-20mm is used to extend the product's protrusion outwards from the intersection line with the base plane as material storage and transition for subsequent secondary reverse drawing deformation. The primary punch b16 is the reverse protrusion, and the extended line is the primary parting line b10. The area outside the primary parting line b10 is the primary blanking surface b9. The internal design of the primary parting line b10 is a third protrusion structure with a gentler profile and a larger chamfer radius, opposite to the second protrusion structure of the part, causing the sheet metal within the primary parting line b10 to bulge during the first drawing. The height and shape design of the third protrusion structure: the arc length of the cross-sectional curve ADB of the second protrusion structure is basically the same as the arc length of the cross-sectional curve ACB of the third protrusion structure. To avoid wrinkling on the curved sidewalls, the transition rounded corner portion is drawn out first during the first drawing process.

[0050] In the secondary drawing process of step 2, the intersection line of the convex hull and the base surface is used as the secondary parting line, the convex hull is used as the secondary punch b12, and the outer side of the secondary parting line b11 is used as the secondary blank holder surface b13. Through reverse drawing, when the part is placed after secondary drawing, the secondary blank holder surface will not interfere with the primary punch b16. For example... Figure 9 and Figure 10 As shown, secondary drawing reverse drawing, Figure 9 The stamping direction of the secondary drawing process is from bottom to top, as shown in the diagram.

[0051] like Figure 11 As shown, after the drawing is completed, the waste material around the perimeter is removed along the trimming line b14.

[0052] Because the upper radius of the radial section of the arc-shaped sidewall is large and the bottom edge radius is small, it will cause obvious wrinkling after being formed by flanging from a flat surface. Therefore, in the technical solution of this invention, in step 3, the stamping direction is adjusted so that the arc-shaped sidewall of the axial section forms a 3-degree angle with the stamping direction, and the upper half of the arc-shaped sidewall is flanged (b15). By using a small angle and flanging the upper half, wrinkling caused by directly flanging in one step is avoided. The flanging parting line (b17) and the stamping direction of the flanging process are as follows: Figure 12 As shown.

[0053] In step 4, the bottom portion of the curved sidewall is shaped, and the shaped surface b18 is as follows: Figure 13As shown, the stamping direction is adjusted again so that the arc-shaped sidewall of the axial section forms a 13-degree angle with the stamping direction. The lower half of the arc-shaped sidewall is then shaped, and the resulting arc-shaped sidewall structure is the product structure.

[0054] In summary, by adopting a drawing process—first drawing a portion of the convex structure, then drawing it a second time, and finally drawing the entire structure—the problems of cracking during drawing of large and deep convex structures, cracking of small and deep convex structures, and cracking of convex structures with sharp shapes can be effectively solved. Regarding the wrinkling problem on the tapered sidewall of the rear suspension support plate of an automobile, which forms an acute angle with the base surface, a process of first drawing a portion of the rounded corner surface, then flanging half of the sidewall at the second included angle (b15), and finally shaping the remaining portion, effectively solves the wrinkling problem.

[0055] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A stamping process for an automotive suspension support plate, used for stamping an automotive rear suspension support plate (19), wherein the rear suspension support plate has a second convex structure with a small bottom area in the middle, the second convex structure has a small rounded corner, and the sidewall of the rear suspension support plate is a tapered arc-shaped sidewall with an acute included angle, characterized in that, include: Step 1: Perform the first drawing forming. The base plane is the first pressing surface b (9). The intersection line of the second convex structure and the base plane is extended by a preset distance as the transition area for material storage and subsequent secondary reverse drawing deformation. The extended line is the first parting line b (10). The outside of the first parting line b (10) is the first pressing surface b (9). Step 2: Perform a second rolling forming so that the intersection line of the third convex hull structure and the base surface is the secondary parting line b (11), the third convex hull structure is the secondary punch b (12), and the outer side of the secondary parting line b (11) is the secondary blanking surface b (13). Perform reverse drawing forming, wherein the interior of the primary parting line b (10) is the third convex hull structure with a reverse cutting surface that is gentler than the second convex hull structure and a chamfer larger than the second convex hull structure. Step 3: Adjust the stamping direction so that the arc-shaped sidewall of the axial section forms the first angle with the stamping direction, and perform the flanging b(15) on the upper half of the arc-shaped sidewall. Step 4: Shape the bottom of the arc-shaped sidewall and adjust the stamping direction again so that the arc-shaped sidewall of the axial section forms a second angle with the stamping direction. Shape the lower half of the arc-shaped sidewall. After shaping, it becomes the arc-shaped sidewall structure of the part. The first angle is 3 degrees and the second angle is 13 degrees.

2. The stamping process for the automotive suspension support plate according to claim 1, characterized in that, Also includes: Step 21: After the drawing is completed, cut off the surrounding waste along the trimming line b(14).

3. The stamping process for the automotive suspension support plate according to claim 1, characterized in that, The preset distance is 15-20mm.

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