Plate-shaped part forming method, drawing die assembly and plate-shaped part

Abstract

The invention relates to the technical field of part machining, and provides a plate-shaped part forming method, a drawing die assembly and a plate-shaped part, and the plate-shaped part forming method comprises the steps that a first drawing die is adopted for conducting drawing forming on a flat plate material, a first plate face, a second plate face and a third plate face which are sequentially connected are obtained, and the first plate face and the second plate face are arranged in a staggered mode; a first round corner is formed at the connecting position of the second plate surface and the third plate surface, the radius of the first round corner is larger than 20 t1, and t1 is the thickness of the flat plate material; and a second drawing die is adopted for conducting reverse drawing forming on the third plate face, a fourth plate face is obtained, a storage bag is formed on the fourth plate face, a second fillet is formed at the connecting position of the second plate face and the fourth plate face, and the radius of the second fillet is smaller than that of the first fillet. According to the plate-shaped part forming method, through the two working procedures, stamping traces are prevented from flowing into the visual area of a product, and the problem that the stamping traces can appear in the visual area of a plate is solved.

Description

Technical Field

[0001] The present application relates to the technical field of parts processing, and in particular to a plate-like parts forming method, a drawing die assembly and a plate-like parts. Background Art

[0002] As the aesthetic requirements for the appearance of automobiles are getting higher and higher, the requirements for the panels of the white body are becoming more and more picky, and thus the requirements for the appearance quality of the panels during the stamping process (especially the visible area) are also getting higher and higher.

[0003] At present, panels are usually produced by directly drawing flat sheets and then trimming and forming them. Due to the shape requirements of the panels themselves, this stamping process cannot meet the appearance requirements of the panels. During the forming process, stamping marks will appear in the visible area of ​​the panels, which require manual polishing to eliminate the stamping marks. However, the effect of manual polishing is not ideal, and visible defects will still appear after the panels are painted. Summary of the invention

[0004] In view of this, an embodiment of the present application provides a plate-like part forming method, a drawing die assembly and a plate-like part to solve the problem of stamping marks appearing in the visible area of ​​the plate.

[0005] The first aspect of the present application provides a plate-shaped part forming method, comprising:

[0006] A first drawing die is used to draw a flat plate material to obtain a first plate surface, a second plate surface and a third plate surface that are connected in sequence, wherein the first plate surface and the third plate surface are arranged in a staggered manner, and a first fillet is formed at a connection position between the second plate surface and the third plate surface, and the radius of the first fillet is greater than 20t1, wherein t1 is the thickness of the flat plate material;

[0007] The third plate surface is reversely drawn using a second drawing die to obtain a fourth plate surface, on which a material storage bag is formed, and a second fillet is formed at the connection position between the second plate surface and the fourth plate surface, and the radius of the second fillet is smaller than the radius of the first fillet.

[0008] The plate-like parts forming method provided by the embodiment of the present application has the following beneficial effects: when the first drawing die is used to draw the flat plate, since the radius of the first fillet is greater than 20 times the thickness of the flat plate, the contact stress during stamping can be reduced, thereby reducing the stamping marks; when the second drawing die is used to reversely draw the third plate surface, since a material storage bag is formed on the fourth plate surface, when the first fillet is changed to the second fillet, the excess material can flow into the material storage bag. Through the above two processes, the stamping marks are prevented from flowing into the visible area of ​​the product, and the problem of stamping marks appearing in the visible area of ​​the plate is solved.

[0009] In some embodiments, the radius of the first fillet is 12-30 mm.

[0010] In some embodiments, the fourth plate surface includes a first plate segment and a second plate segment, the connection position between the second plate surface and the first plate segment forms the second rounded corner, the material storage bag is on the second plate segment, and the distance between the material storage bag and the first plate segment is 3-12 mm.

[0011] In some embodiments, the width of the material storage bag is 3-12 mm; and / or the height of the material storage bag is 3-12 mm.

[0012] In some embodiments, the draft angle of the storage bag is 3°-12°.

[0013] In some embodiments, the storage bag protrudes in the direction of reverse drawing.

[0014] The second aspect of the present application proposes a drawing die assembly, which is applied to the plate-like part forming method as described in the first aspect. The drawing die assembly includes a first drawing die and a second drawing die, the first drawing die includes a first die, a first punch and a first pressing piece, the first punch and the first pressing piece are both located below the first die, the first die and the first pressing piece cooperate to press the edge of the flat plate, the first die and the first punch cooperate to form a first plate surface, a second plate surface, a third plate surface and a first rounded corner; the second drawing die includes a second die, a second punch, a second pressing piece and a third pressing piece, the second punch, the second pressing piece and the third pressing piece are all located below the second die, and the second punch is located between the second pressing piece and the third pressing piece, the second pressing piece and the second die cooperate to press the first plate surface and the second plate surface, the third pressing piece and the second die cooperate to press a part of the third plate surface, the second punch and the second die cooperate to draw another part of the third plate surface to obtain a second rounded corner and a fourth plate surface provided with a material storage bag.

[0015] The drawing die assembly adopts any one or more embodiments of the above-mentioned plate-like parts forming method, and thus has the beneficial effects of the above-mentioned embodiments, which will not be described one by one here.

[0016] In some embodiments, the pressing force of the second pressing member is greater than the pressing force of the third pressing member.

[0017] In some embodiments, the drawing die assembly also includes a first nitrogen spring, which is connected to the first pressing piece to provide a pressing force to the first pressing piece; and / or, the drawing die assembly also includes a second nitrogen spring, which is connected to the second pressing piece to provide a pressing force to the second pressing piece; and / or, the drawing die assembly also includes a third nitrogen spring, which is connected to the third pressing piece to provide a pressing force to the third pressing piece.

[0018] A third aspect of the present application provides a plate-shaped part, which is made by the plate-shaped part forming method as described in the first aspect.

[0019] The plate-shaped part adopts any one or more embodiments of the above-mentioned plate-shaped part forming method, and thus has the beneficial effects of the above-mentioned embodiments, which will not be described one by one here.

[0020] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or conventional technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of an existing plate-shaped part;

[0023] Figure 2 yes Figure 1 The structural schematic diagram of the stamping molding of the plate-like parts shown;

[0024] Figure 3 is a flow chart of a plate-shaped part forming method provided by some embodiments of the present application;

[0025] Figure 4 It is a schematic diagram of the structure of stamping molding of plate-like parts provided in some embodiments of the present application;

[0026] Figure 5 is a schematic structural diagram of a first drawing die before mold closing provided in some embodiments of the present application;

[0027] Figure 6 is a schematic diagram of the structure of the first drawing die after mold closing provided in some embodiments of the present application;

[0028] Figure 7 is a schematic diagram of the structure of the second drawing die before mold closing provided in some embodiments of the present application;

[0029] Figure 8 It is a schematic diagram of the structure of the second drawing die after mold closing provided in some embodiments of the present application.

[0030] The meanings of the marks in the figure are:

[0031] 10. The first board surface;

[0032] 20. Second board surface;

[0033] 30. The third board;

[0034] 40. First fillet;

[0035] 50, second fillet;

[0036] 60. first drawing die; 61. first concave die; 62. first convex die; 63. first pressing piece; 64. first nitrogen spring;

[0037] 70. Second drawing die; 71. Second concave die; 711. Concave portion; 72. Second convex die; 721. Concave portion; 73. Second pressing piece; 74. Third pressing piece; 75. Second nitrogen spring; 76. Third nitrogen spring;

[0038] 80. Flat sheet;

[0039] 90, fourth board surface; 91, first board section; 92, second board section; 921, material storage bag;

[0040] 200, plate-shaped parts; 201, visible panel surface; 202, fixed panel surface; 203, rounded corners. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0043] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0044] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0046] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0047] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] At present, in the process of drawing die design, most of them still adopt the method of directly drawing flat materials and then cutting and forming to produce plate-like parts. Due to the shape requirements of the plate-like parts themselves, this stamping process cannot meet the appearance requirements of the plate-like parts, and stamping marks will appear in the visible area during the forming process.

[0050] Please refer to Figure 1 The plate-like part 200 is the inner panel of the C-pillar of the rear door window frame of the car. The plate-like part 200 includes a visible panel surface 201 and a fixed panel surface 202. The visible panel surface 201 is not covered by other parts or decorations, and stamping defects can be observed. The fixed panel surface 202 is used to fix the plate-like part 200 on the car body and cannot be cancelled or changed.

[0051] When stamping the plate-shaped part 200, please refer to Figure 2 , ABCD segment is the cross section of the plate-like part 200, ABC segment is the cross section of the visible plate surface 201, CD segment is the cross section of the fixed plate surface 202, ABCDE segment is the cross section of the process modeling, and the plate-like part 200 can be obtained by cutting and removing the DE segment, wherein the thickness of the plate-like part 200 is t, and the radius of the fillet 203 is R. Affected by the product modeling, t is usually less than 1mm, and R is usually less than 8mm. For example, R is 8mm, t is 1mm, and the radius R (8mm) of the fillet 203 is much smaller than 20t (20mm). During the stamping process, a hardening line is generated at the fillet 203 (the smaller the radius R of the fillet 203, the more obvious the hardening line). As the stamping proceeds, the material flows along the direction of D→C→B, and the hardening line generated by the fillet 203 gradually flows to the BC segment of the visible plate surface 201, forming a stamping mark; the stamping mark is not easy to eliminate during the post-processing process, which affects the product appearance quality.

[0052] In order to solve the above problems, the first embodiment of the present application provides a method for forming a plate-shaped part. Figure 3 , Figure 4 , Figure 5 and Figure 7 , the plate-like parts forming method includes:

[0053] S1. Use the first drawing die 60 to draw the flat plate material 80 to obtain the first plate surface 10, the second plate surface 20 and the third plate surface 30 which are connected in sequence. The first plate surface 10 and the third plate surface 30 are staggered, and the connecting position of the second plate surface 20 and the third plate surface 30 forms a first fillet 40. The radius R1 of the first fillet 40 is greater than 20t1, wherein t1 is the thickness of the flat plate material 80.

[0054] Optionally, the flat sheet 80 is a metal sheet.

[0055] The first board surface 10 , the second board surface 20 and the third board surface 30 are connected in sequence. It can be understood that the second board surface 20 is connected between the first board surface 10 and the third board surface 30 .

[0056] The first plate surface 10 and the third plate surface 30 are staggered, which can be understood as the first plate surface 10 and the third plate surface 30 are not on the same plane. Optionally, the first plate surface 10 and the third plate surface 30 are arranged in parallel or substantially in parallel, and the second plate surface 20 is arranged obliquely.

[0057] The radius R1 of the first fillet 40 is greater than 20t1, that is, the radius R1 of the first fillet 40 is greater than 20 times the thickness of the flat material 80; it can be understood that when t1 is 1mm, the radius of the first fillet 40 is greater than 20mm; when t1 is 0.8mm, the radius of the first fillet 40 is greater than 16mm; when t1 is 0.6mm, the radius of the first fillet 40 is greater than 12mm.

[0058] Among them, the first board surface 10 corresponds to Figure 4 The AB segment in the second board surface 20 corresponds to Figure 4 The BC section in the third plate surface 30 corresponds to Figure 4 In the IH segment, the first fillet 40 corresponds to Figure 4 The CI segment in .

[0059] S2. Use the second drawing die 70 to reversely draw the third plate surface 30 to obtain the fourth plate surface 90, and a storage bag 921 is formed on the fourth plate surface 90. The connecting position of the second plate surface 20 and the fourth plate surface 90 forms a second fillet 50, and the radius of the second fillet 50 is smaller than the radius of the first fillet 40.

[0060] The second drawing die 70 performs reverse drawing on the third plate surface 30 , that is, the first drawing die 60 and the second drawing die 70 have opposite drawing directions at the third plate surface 30 . For example, the first drawing die 60 draws the flat plate 80 downward to form the third plate surface 30 , and the second drawing die 70 draws the third plate surface 30 upward to form the fourth plate surface 90 .

[0061] During reverse drawing, the material storage bag 921 allows excess material to enter, thereby preventing the stamping marks from flowing into the visible area of ​​the product and preventing wrinkles from forming in the CJD section.

[0062] It should be noted that the second fillet 50 is the fillet that the product will eventually obtain.

[0063] The fourth panel 90 corresponds to Figure 4 In the JDEFGH segment, the second fillet 50 corresponds to Figure 4 The CJ segment in the plate-shaped parts corresponds to Figure 4The ABCJD segment in the drawing means that after the second drawing die 70 is finished drawing, DEFGH is cut off at D to obtain a plate-like part; wherein the ABC segment is the visible surface of the plate-like part, and the JD segment is the fixed surface of the plate-like part.

[0064] The length of the CJDEFGH segment is greater than or equal to the length of the CIH segment.

[0065] The plate-like parts forming method provided by the embodiment of the present application has the following beneficial effects: when the first drawing die 60 is used to draw the flat sheet 80, since the radius of the first fillet 40 is greater than 20 times the thickness of the flat sheet 80, the contact stress during stamping can be reduced, thereby reducing the stamping marks; when the second drawing die 70 is used to reversely draw the third plate surface 30, since a material storage bag 921 is formed on the fourth plate surface 90, when the first fillet 40 is changed into the second fillet 50, the excess material can flow into the material storage bag 921. Through the above two processes, the stamping marks are prevented from flowing into the visible area of ​​the product, and the problem of stamping marks appearing in the visible area of ​​the plate-like parts is solved.

[0066] In some embodiments, the radius R1 of the first rounded corner 40 is 12-30 mm.

[0067] Since the radius R1 of the first fillet 40 is greater than 20t1, when the radius R1 of the first fillet 40 is 12 mm, t1 is less than 0.6 mm; when the radius R1 of the first fillet 40 is 18 mm, t1 is less than 0.9 mm; when the radius R1 of the first fillet 40 is 24 mm, t1 is less than 1.2 mm; when the radius R1 of the first fillet 40 is 30 mm, t1 is less than 1.5 mm.

[0068] The radius R1 of the first fillet 40 may be appropriately selected according to the thickness t1 of the flat plate 80 to reduce the contact stress during stamping, thereby alleviating the stamping marks.

[0069] In some embodiments, the fourth plate surface 90 includes a first plate segment 91 and a second plate segment 92, the connection position of the second plate surface 20 and the first plate segment 91 forms a second fillet 50, the storage bag 921 is on the second plate segment 92, and the distance between the storage bag 921 and the first plate segment 91 is 3-12 mm.

[0070] The distance between the material storage bag 921 and the first plate segment 91 is 3-12 mm, that is, the distance between D and E is 3-12 mm; it can be understood that the distance between the material storage bag 921 and the first plate segment 91 can be 3 mm, 5 mm, 8 mm, 10 mm, 12 mm, etc.

[0071] Among them, the first plate segment 91 corresponds to Figure 4 Middle JD segment, second plate segment 92 corresponds to Figure 4The DEFGH section in the drawing die 70, that is, after the drawing is completed, the second plate section 92 is cut off to obtain a plate-shaped part.

[0072] Based on the above scheme, the distance between the material storage bag 921 and the first plate segment 91 is designed to be 3-12mm, that is, the distance between the material storage bag 921 and the first plate segment 91 is relatively moderate, which is not only conducive to the flow of material at CJD to the material storage bag 921, but also conducive to cutting off the second plate segment 92 at D.

[0073] In some embodiments, the width of the material storage bag 921 is 3-12 mm, and the height of the material storage bag 921 is 3-12 mm.

[0074] Among them, the width of the storage bag 921 can be considered as the horizontal distance from F to G, and the height of the storage bag 921 can be considered as the vertical distance from F to E.

[0075] Optionally, the width of the material storage bag 921 can be 3mm, 5mm, 8mm, 10mm, 12mm, etc.; the height of the material storage bag 921 can be 3mm, 5mm, 8mm, 10mm, 12mm, etc.

[0076] The width and height of the material storage bag 921 may be the same or different.

[0077] In other embodiments, when the width of the storage bag 921 is 3-12 mm, the height of the storage bag 921 may be greater than 12 mm or less than 3 mm; or, when the height of the storage bag 921 is 3-12 mm, the width of the storage bag 921 may be greater than 12 mm or less than 3 mm; or, the width of the storage bag 921 may be greater than 12 mm or less than 3 mm, and the height of the storage bag 921 may be greater than 12 mm or less than 3 mm.

[0078] In some embodiments, the draft angle of the storage bag 921 is 3°-12°.

[0079] The draft angle refers to the inclination angle of the side wall of the storage bag 921. For example, the inclination angle of the EF segment is the draft angle.

[0080] It can be understood that the draft angle of the storage bag 921 can be 3°, 5°, 8°, 10° or 12°, etc.

[0081] Optionally, the draft angles of the side walls on both sides of the storage bag 921 may be the same or different.

[0082] Based on the above solution, the draft angle of the material storage bag 921 is designed to be 3°-12°, which is conducive to demoulding.

[0083] In some embodiments, the material storage bag 921 protrudes in the direction of reverse drawing, that is, the protruding direction of the material storage bag 921 is the same as the drawing direction of the third plate surface 30 by the second drawing die 70 .

[0084] The second aspect of the present application proposes a drawing die assembly, which is applied to the plate-like part forming method as described in the first aspect.

[0085] Please refer to Figures 5 to 8 The drawing die assembly includes a first drawing die 60 and a second drawing die 70. The first drawing die 60 includes a first die 61, a first punch 62 and a first pressing piece 63. The first punch 62 and the first pressing piece 63 are both located below the first die 61. The first die 61 and the first pressing piece 63 cooperate to press the edge of the flat plate 80. The first die 61 and the first punch 62 cooperate to form the first plate surface 10, the second plate surface 20, the third plate surface 30 and the first fillet 40. The second drawing die 70 includes a second die 71, a second punch 72, a second pressing piece 7 3 and the third pressing piece 74, the second punch 72, the second pressing piece 73 and the third pressing piece 74 are all located below the second die 71, and the second punch 72 is located between the second pressing piece 73 and the third pressing piece 74, the second pressing piece 73 and the second die 71 are used together to press the first plate surface 10 and the second plate surface 20, the third pressing piece 74 and the second die 71 are used together to press a part of the third plate surface 30, the second punch 72 and the second die 71 are used together to draw another part of the third plate surface 30 to obtain the second fillet 50 and the fourth plate surface 90 provided with a storage bag 921.

[0086] The first pressing member 63 is a pressure ring.

[0087] Optionally, the drawing die assembly further includes a first nitrogen spring 64, which is connected to the first pressing piece 63 to provide a pressing force to the first pressing piece 63, wherein the first nitrogen spring 64 is located below the first pressing piece 63, and the first nitrogen spring 64 is used to provide an upward pressing force to the first pressing piece 63. It can be understood that the first nitrogen spring 64 can be fixedly connected to the first pressing piece 63, and can also be detachably connected to the first pressing piece 63.

[0088] The drawing die assembly further includes a second nitrogen spring 75, which is connected to the second binder 73 to provide a pressing force to the second binder 73, wherein the second nitrogen spring 75 is located below the second binder 73, and the second nitrogen spring 75 is used to provide an upward pressing force to the second binder 73. It can be understood that the second nitrogen spring 75 can be fixedly connected to the second binder 73, or can be detachably connected to the second binder 73.

[0089] The drawing die assembly further includes a third nitrogen spring 76, which is connected to the third pressing piece 74 to provide a pressing force to the third pressing piece 74, wherein the third nitrogen spring 76 is located below the third pressing piece 74, and the third nitrogen spring 76 is used to provide an upward pressing force to the third pressing piece 74. It can be understood that the third nitrogen spring 76 can be fixedly connected to the third pressing piece 74, and can also be detachably connected to the third pressing piece 74.

[0090] It is understandable that the pressing forces provided by the first nitrogen spring 64 , the second nitrogen spring 75 and the third nitrogen spring 76 are controllable, that is, the first nitrogen spring 64 , the second nitrogen spring 75 and the third nitrogen spring 76 can be used to provide a pressing force of a specified magnitude according to actual needs.

[0091] Among them, nitrogen spring is an elastic component with high-pressure nitrogen as the working medium. It has the advantages of small size, large elastic force, long stroke, stable operation, long service life, gentle elastic force curve and no need for pre-tightening. Therefore, nitrogen spring can simplify mold design and manufacturing, facilitate mold installation and adjustment, extend the service life of the mold, and ensure the stability of product quality.

[0092] Of course, at least one of the first nitrogen spring 64 , the second nitrogen spring 75 and the third nitrogen spring 76 may be replaced by a metal spring, a rubber elastic member, a hydraulic support rod or the like.

[0093] Optionally, a concave portion 711 is provided on the second die 71 , and a convex portion 721 is provided on the second punch 72 . When the second die 71 and the second punch 72 are closed, the upper concave portion 711 and the convex portion 721 cooperate to form a material storage bag 921 on the fourth plate surface 90 .

[0094] The working process of the drawing die assembly is as follows:

[0095] (1) Drawing and forming by the first drawing die 60: The cross section of the first drawing die 60 is as follows Figure 5 and Figure 6 As shown; the first die 61 moves downward with the slider on the press and abuts against the first pressing piece 63; the first nitrogen spring 64 provides a pressing force to the first pressing piece 63, and the first pressing piece 63 and the first die 61 cooperate to press the edge of the flat plate 80, and the flat plate 80 moves downward with the first die 61; as the first die 61 and the first punch 62 move to close, the flat plate 80 is drawn to obtain the first plate surface 10 (AB section), the second plate surface 20 (BC section), the third plate surface 30 (IH section) and the first fillet 40 (CI section), completing the first drawing process.

[0096] The radius R1 of the first fillet 40 drawn by the first drawing die 60 is greater than 20t1, which greatly reduces the contact stress between the first die 61 and the flat plate 80, effectively eliminates the stamping marks produced during contact, and makes it almost impossible to observe the stamping marks visually.

[0097] (2) Drawing and forming by the second drawing die 70: The cross section of the second drawing die 70 is as follows Figure 7 and Figure 8 As shown; the second die 71 moves downward along with the slider on the press, and abuts against the second pressing piece 73 and the third pressing piece 74; wherein, the second pressing piece 73 cooperates with the second die 71 to press the first plate surface 10 and the second plate surface 20 (i.e., the ABC section) to avoid the flow of materials of the first plate surface 10 and the second plate surface 20; the third pressing piece 74 cooperates with the second die 71 to press part of the third plate surface 30 to avoid wrinkling of the compressed part of the third plate surface 30; thereafter, the second pressing piece 73, the third pressing piece 74 and the second die 71 move downward together, and the convex portion 721 of the second punch 72 preferentially contacts the third plate surface 30, thereby pulling the material to flow along the C→H direction; wrinkling of the final molding surface CJDE section is avoided, and at the same time, excess material flows into the storage bag 921.

[0098] The pressing force at the second pressing piece 73 is greater than the pressing force at the third pressing piece 74. Optionally, the pressing force at the second pressing piece 73 is the plate locking force, that is, the material on the visible plate surface (ABC segment) does not flow due to locking, thereby preventing the stamping slip marks from sliding into the visible plate surface; the pressing force at the third pressing piece 74 is lower than the plate locking force, thereby providing feasibility for the material to flow from H→I, thereby preventing the cracking problem when the plate-like parts are formed from CIH to CJDEFGH.

[0099] Among them, after the second drawing die 70 is drawn and formed, the second fillet 50 and the fixed flange required by the product are obtained, and the risks related to the stamping marks flowing into the visible area and the wrinkling of the flange surface are effectively avoided.

[0100] This application reduces contact stress by changing the size of the stamping contact fillet and changes the material flow direction by setting a material storage bag, thereby improving the appearance quality of plate-shaped parts. This application does not modify the product shape, does not redefine the product's visible area, and does not increase additional product requirements; it also reduces post-processing processes, improves product production quality and production efficiency, and reduces production costs.

[0101] The third aspect of the present application provides a plate-shaped part, which is made by the plate-shaped part forming method as described in the first aspect. The plate-shaped part can be a C-pillar inner plate of a rear door window frame of a car, a water channel outer plate, etc.

[0102] The plate-shaped part adopts any one or more embodiments of the above-mentioned plate-shaped part forming method, and thus has the beneficial effects of the above-mentioned embodiments, which will not be described one by one here.

[0103] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for forming a plate-like part, characterized in that: include: A first drawing die is used to draw a flat plate material to obtain a first plate surface, a second plate surface and a third plate surface that are connected in sequence, wherein the first plate surface and the third plate surface are arranged in a staggered manner, and a first fillet is formed at a connection position between the second plate surface and the third plate surface, and the radius of the first fillet is greater than 20t1, wherein t1 is the thickness of the flat plate material; The third plate surface is reversely drawn using a second drawing die to obtain a fourth plate surface, on which a material storage bag is formed, and a second fillet is formed at the connection position between the second plate surface and the fourth plate surface, and the radius of the second fillet is smaller than the radius of the first fillet.

2. The plate-shaped parts forming method according to claim 1, characterized in that: The radius of the first rounded corner is 12-30 mm.

3. The plate-shaped parts forming method according to claim 1, characterized in that: The fourth plate surface includes a first plate segment and a second plate segment, the connecting position of the second plate surface and the first plate segment forms the second fillet, the material storage bag is located on the second plate segment, and the distance between the material storage bag and the first plate segment is 3-12 mm.

4. The plate-shaped parts forming method according to claim 1, characterized in that: The width of the material storage bag is 3-12 mm; and / or the height of the material storage bag is 3-12 mm.

5. The plate-shaped parts forming method according to claim 1, characterized in that: The draft angle of the material storage bag is 3°-12°.

6. The plate-shaped parts forming method according to any one of claims 1 to 5, characterized in that: The material storage bag protrudes in the direction of reverse drawing forming.

7. A drawing die assembly, characterized in that: The plate-like part forming method applied to any one of claims 1 to 6, wherein the drawing die assembly includes a first drawing die and a second drawing die, the first drawing die includes a first die, a first punch and a first pressing piece, the first punch and the first pressing piece are both located below the first die, the first die and the first pressing piece cooperate to press the edge of the flat plate, the first die and the first punch cooperate to form a first plate surface, a second plate surface, a third plate surface and a first fillet; the second drawing die includes a second die, a second punch, a second pressing piece and a third pressing piece, the second punch, the second pressing piece and the third pressing piece are all located below the second die, and the second punch is located between the second pressing piece and the third pressing piece, the second pressing piece and the second die cooperate to press the first plate surface and the second plate surface, the third pressing piece and the second die cooperate to press a part of the third plate surface, the second punch and the second die cooperate to draw another part of the third plate surface to obtain a second fillet and a fourth plate surface provided with a material storage bag.

8. The drawing die assembly according to claim 7, characterized in that: The pressing force of the second pressing member is greater than the pressing force of the third pressing member.

9. The drawing die assembly according to claim 7, characterized in that: The drawing die assembly also includes a first nitrogen spring, which is connected to the first pressing piece to provide a pressing force to the first pressing piece; and / or the drawing die assembly also includes a second nitrogen spring, which is connected to the second pressing piece to provide a pressing force to the second pressing piece; and / or the drawing die assembly also includes a third nitrogen spring, which is connected to the third pressing piece to provide a pressing force to the third pressing piece.

10. A plate-shaped component, characterized in that: The plate-shaped part is made by the plate-shaped part forming method according to any one of claims 1-6.

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